Abstract:
Provided is a defoaming agent for a liquid detergent, comprising the following components: component A1, a modified polyorganosiloxane formed by reacting a hydrogen-containing polyorganosiloxane, an unsaturated polyether and an α-olefin; component A2, a modified polyorganosiloxane formed by reacting a hydrogen-containing polyorganosiloxane, an unsaturated polyether and a bivinyl-terminated polyorganosiloxane; component B, an organosilicon composition composed of a hydrogen-containing polyorganosiloxane, a polymer composed of an acrylate and an α-olefin, silica and an organosilicon resin; component C, a thickening agent; and component ID, water. An excellent compatibility between the modified polyorganosiloxanes A1 and A2 enables the defoaming agent to exhibit an excellent defoaming performance, stability and clarity in a laundry detergent.

Description:
BACKGROUND 
       [0001]    Technical Field 
         [0002]    The disclosure provides a defoaming agent for a liquid detergent, having a strong foam control effect, capable of ensuring clarity of detergents, and belonging to the technical field of fine chemical. 
         [0003]    Related Art 
         [0004]    As daily necessities for people, liquid detergents have become prevailing detergents because they are simple in process equipment, are easy to use, are fast dissolving, are milder for fabric and skin, etc. Due to high content and much foam, surfactants are difficult to rinse, not only waste water resources, and increase the washing cost, but also will result in large-scale water pollution, and go against energy conservation, emission reduction and environmental protection. 
         [0005]    Because of low surface tension, defoaming agents can quickly penetrate into the foam system, resulting in the bubble burst. When added to a liquid detergent, the defoaming agent can effectively solve the problem of much foam and difficult rinse in the washing process. At present, the defoaming agents used in detergents are mainly organosilicone defoaming agents. However, for non-structural detergents, besides an defoaming performance, compatibility and clarity have always been very important knotty problems, especially clarity. After addition of an organosilicone defoaming agent, a detergent will become turbid, and fail to reach aesthetic requirements. 
         [0006]    Polydimethylsiloxane has relatively small surface tension. But due to relatively poor compatibility with organics, there is weak affinity between the active components of a defoaming agent and a foam film, thereby resulting in poor defoaming performance. DE-A2025722 discloses to disperse hydrophobic silica in polydimethylsiloxane, but the obtained defoaming agent has a poor defoaming performance. DE-B2222998 selects to introduce a polyether group into polydimethylsiloxane. The introduction of the polyether group solves the compatibility problem, but the defoaming efficiency is low, thereby increasing the use cost. 
         [0007]    After grafting a hydrophobic group onto the chain of polydimethylsiloxane, the hydrophobic performance is improved, but the compatibility with organics is significantly improved, and the affinity between defoaming particles and a foam film is enhanced, thereby contributing to defoaming. EP1075684 discloses a foam control agent for a liquid detergent, comprising an organic-based polysiloxane material, an organosilicon resin and a hydrophobic filler, wherein the organopolysiloxane material comprises organopolysiloxane having at least one silicon-bonded substituent having the molecular formula X—Ar, wherein X represents a divalent aliphatic group bonded to silicon through a carbon atom, and Ar represents an aromatic group. Organic-based resin is selected from the group consisting of siloxane units having the formula RaSiO (4-a)/2 , wherein R represents a hydroxyl group, a hydrocarbon or a hydrocarbonoxy group and a has an average value from 0.5 to 2.4. EP1075683 discloses a foam inhibitor with similar composition, except that it contains a water-insoluble organic liquid, which may be a mineral oil, a liquid polyisobutene or a vegetable oil. CN102307978A also discloses a foam inhibitor with similar composition, comprising, on the basis of EP1075684, an organopolysiloxane resin having at least one polyoxyalkylene group, wherein the organopolysiloxane resin comprises tetrafunctionalsiloxane units having the formula RSiO 4/2  and monofunctionalsiloxane units having the formula R 3 SiO 4/2 . The total number of tetrafunctionalsiloxane units in the resin is at least 50% based on the total number of siloxane units, and R represents a hydroxyl group. This liquid foam inhibitor is used in heavy duty liquid (HDL) detergents to solve the stability and foam control performance of the composition in detergents, but the turbidity of liquid detergents is increased in appearance. 
         [0008]    Polyorganosiloxane is modified with an alkyl group to improve the binding force between the organosilicone defoaming composition and organic materials, so that the synthetic organosilicon emulsion has excellent defoaming performance in anionic and non-ionic systems. EPA578424 discloses a foam inhibitor comprising a polydimethylsiloxane with an alkyl side chain, wherein the alkyl side chain contains 9 to 35 carbon atoms, and 40 to 100% silicone composition carries a hydroxyl group having 9 to 35 carbon atoms. EPA121210 discloses a modified phlysiloxane having an alkyl group having 6 to 30 carbon atoms, provided that the number of carbon atoms accounts for 30 to 65% in the group “—CH2-”, in order to obtain an efficient defoaming agent in combination with a mineral oil. CN102698475A introduces a defoaming composition, which is characterized by being prepared by the following steps of: obtaining an alkyl-modified polyorganosilicone through reaction of a hydrogen-containing polyorganosilicone, an α-olefin and a vinyl polyorganosilicone; and adding silica, an organic silicon resin and an aminopolyorganosilicone, mixing same so as to obtain an organosilicone defoaming composition, which can be used for a defoaming component in organosilicone emulsions and solid defoaming agents. A solid particle defoaming agent prepared by using the obtained active component has a sustained release effect and a foam control effect. When added to a washing powder, the solid particle defoaming agent can guarantee rich foam in the early stage of washing, fully washing, convenient rinse in the late stage of washing, and a water saving effect. Addition of the aminopolyorganosiloxane thereto can improve the softness of fabrics. CN103272411A relates to a foam inhibitor and a preparation process thereof. The preparation process comprises: obtaining a polyorganosiloxane modified by an alkyl and an unsaturated polyether through reaction of a hydrogen-containing polyorganosiloxane, an unsaturated polyether and an α-olefin in the presence of an acid catalyst; and then adding a hydrophobic particle and an organosilicon resin, mixing same, preparing an O/W emulsion of defoaming agent through emulsification of the active component of the obtained foam inhibitor, and adding the O/W emulsion of the defoaming agent to a non-structural detergent. The foam inhibitor can solve the clarity and attenuation of defoaming properties, but will still have the problem of defoaming agent precipitation after prolonged storage. 
         [0009]    CN102307978A discloses an organopolysiloxane polymer, the preparation of which comprises: preparing a crosslinked siloxane polymer through reaction of a linear hydrogen-containing polyorganosiloxane and bivinylpolysiloxane in the presence of a catalyst, and then introducing a polyoxyalkylenesiloxane into the crosslinked polymer to obtain a crosslinked siloxane polymer with side chains. A defoaming composition prepared from the polymer and an organic-based siloxane material containing X—Ar is used in a detergent to have better defoaming properties. But its stability in the detergent is not disclosed. These polymers are described in, for example, EP0663225, CN1331278 and EP1167502B1. 
         [0010]    The emulsifier used in preparing an O/ emulsion from an organosilicon composition must have strong affinity with the composition, and can form a stable monomolecular film on the surface of oil drops. For an organosilicon composition with alkyl groups, due to the presence of alkyl groups, ordinary siloxane polymer containing a polyoxyalkylenesiloxane is less compatible with the siloxane composition. Moreover, a single emulsifier cannot reach the effect of compounding a plurality of emulsifiers. 
       SUMMARY 
       [0011]    The present invention compounds a branched siloxane polymer modified by an alkyl and a polyether with a crosslinked modified siloxane polymer prepared from an unsaturated polyether, a bivinyl-terminated polyorganosiloxane and a hydrogen-containing polyorganosiloxane, so as to reach a better emulsification and dispersion effect for organosilicon compositions having alkyl groups. The compatibility and synergistic effect between both and other components enable the prepared defoaming agent emulsion to have excellent defoaming performance and clarity in a liquid detergent, and also have excellent stability, so as to ensure that the defoaming agent neither precipitates, nor aggregates in a laundry detergent, and effectively solve the phenomena, such as coagulation and aggregation. 
         [0012]    The objective of the present invention can be achieved through the following measures: 
         [0013]    A defoaming agent for a liquid detergent comprises the following components: 
         [0014]    a component A1: 2-25 parts by weight of a modified polyorganosiloxane formed by reacting a hydrogen-containing polyorganosiloxane, an unsaturated polyether and an α-olefin; 
         [0015]    a component A2: 2-25 parts by weight of a modified polyorganosiloxane formed by reacting a hydrogen-containing polyorganosiloxane, an unsaturated polyether and a bivinyl-terminated polyorganosiloxane; 
         [0016]    a component B: 2-20 parts by weight of an organosilicon composition composed of an acrylate and a polyorganosiloxane modified through grafting with an α-olefin, silica and an organosilicon resin; 
         [0017]    a component C: 0.5-5 parts by weight of a thickening agent; and 
         [0018]    a component D: 50-90 parts by weight of water. 
         [0019]    The defoaming agent for a liquid detergent referred to in the present invention can be formed by mixing the above components only, can further include other components, such as a pH regulating agent or a catalyst existing in the components, and can be further added with other components without bad effects on the overall performance of the present invention to further improve the performance in an aspect or some aspects, for example, the defoaming agent further includes a component E: 1-10 parts by weight of an emulsifier, or can further include a component F: 0.01-0.5 parts by weight of a preservative. The present invention can also further only include any one or a combination of two of the component E and component F. 
         [0020]    In a technical solution, in the components composing the defoaming agent, the use level and mixing ratio are: component A 1: 4-15 parts by weight, component A2: 5-20 parts by weight, component B: 5-15 parts by weight, component C: 0.5-5 parts by weight, component D: 60-80 parts by weight, and component B: 1-10 parts by weight. 
         [0021]    In another technical solution, in the components composing the defoaming agent, the use level and mixing ratio are: component A1: 4-10 parts by weight, component A2: 5-18 parts by weight, component B: 8-15 parts by weight, component C: 0.5-5 parts by weight, component D: 60-80 parts by weight, and component E: 1-10 parts by weight. 
         [0022]    The components of the present invention can be prepared by using existing process. For example, the raw material of component B organosilicon composition contains the components that are not used in the prior art, but can still be prepared using existing process. 
         [0023]    In a specific technical solution, a component Al modified polyorganosiloxane is obtained through reaction of a hydrogen-containing polyorganosiloxane, an unsaturated polyether and an α-olefin in the presence of a catalyst at 80-180° C. 
         [0024]    In a preferred solution, the mass ratio of the monomers in component A1 is: a hydrogen-containing polyorganosiloxane: an unsaturated polyether: an α-olefin=(4 -80): (20-40): (10-30). 
         [0025]    In a specific technical solution, a component A2 modified polyorganosiloxane is obtained through reaction of a hydrogen-containing polyorganosiloxane, an unsaturated polyether and a bivinyl-terminated polyorganosiloxane iii the presence of a catalyst at 80-180° C. 
         [0026]    In a preferred solution, the mass ratio of the monomers in component A2 is: a hydrogen-containing polyorganosiloxane: an unsaturated polyether: a bivinyl-terminated polyorganosiloxane=(40-80): (20-40): (10-30). 
         [0027]    In a specific technical solution, the preparation process of component B is as follows: firstly a hydrogen-containing polyorganosiloxane is fully mixed with an acrylate, to which a catalyst is added at 60-80° C. Then, after the system is heated to 90-110° C. and kept at the temperature, an Ex-olefin is added thereto, and further kept at the temperature. Finally, silica and an organosilicon resin are added and mixed to obtain the component B. 
         [0028]    In a preferred solution, the mass ratio of the raw materials in component B is: a hydrogen-containing polyorganosiloxane: an acrylate: an α-olefin: silica: an organosilicon resin=(40-80): (3-15): (10-30): (1-15): (5-20), 
         [0029]    The contents in each part of the present invention are further described in detail as follows. 
         [0030]    A. Modified polyorganosiloxane (including components A1 and A2) 
         [0031]    In the present invention, the modified polyorganosiloxane is obtained through reaction of a modifying group and a hydrogen-containing polyorganosiloxane in the presence of a catalyst. The modifying group is two or three selected from the group consisting of an unsaturated polyether, an α-olefin and a bivinyl-terminated polyorganosiloxane. The average viscosity of the modified polyorganosiloxane at 25° C. is 10-30,000 mPa·S, preferably 100-3,000 mPa·s. 
         [0032]    A(1) Hydrogen-Containing Polyorganosiloxane: 
         [0033]    A hydrogen-containing polyorganosiloxane at least has a general structural formula as follows: 
         [0000]      H c Me 3-c SiO(MeHSiO) a (Me 2 SiO) b SiMe 3-c H c    
         [0034]    Me is a methyl group, the subscript c is 0 or 1, and a is an integer from 2 to 100, preferably an integer from 10 to 70. h is an integer from 20 to 300, preferably an integer from 40 to 200. Each molecule has at least 2 silicon-bonded hydrogen atoms. The dynamic viscosity of the hydrogen-containing polyorganosiloxane at 25° C. is 20-5,000 mPa·s. In a solution, there are 40-80 parts by weight of a hydrogen-containing polyorganosiloxane in the modified polyorganosiloxane. 
         [0035]    A (II): Unsaturated Polyether 
         [0036]    The unsaturated polyether has the general structure formula as follows: 
         [0000]      ViCH 2 O(EO) x (PO)yR 1    
         [0037]    Vi is a vinyl, R 1  is selected from hydrogen, alkyl group having 1 to 6 carbon atoms, ester group, epoxy group or amino group; EO is ethylene oxide, PO is propylene oxide, x and y are degrees of polymerization, x is an integer from 0 to 150, preferably from 0 to 40; and y is an integer from 0 to 150, preferably from 0 to 100, x and y cannot both be O. In a solution, there are 20-40 parts by weight of an unsaturated polyether in the modified polyorganosiloxane. 
         [0038]    A(III):α-olefin 
         [0039]    The α-olefin has the general structural formula as follows: 
         [0000]      Vi(CH 2 ) z H 
         [0040]    Vi is a vinyl, and z is an integer from 1 to 36, preferably an integer from 6 to 18. In a solution, there are 10-30 parts by weight of an α-olefin in the modified polyorganosiloxane. 
         [0041]    A (IV): Bivinyl-Terminated Polyorganosiloxane: 
         [0042]    The bivinyl-terminated polyorganosilicone has the general structural formula as follows: 
         [0000]      Vi(R 2 ) 2 SiO((R 2 ) 2 SiO) m Si(R 2 ) 2 Vi 
         [0043]    m is an integer from 100 to 500, preferably from 200 to 400; R 2  is an alkyl group having 1-6 carbon atoms, preferably a methyl group. The dynamic viscosity of the bivinyl-terminated polyorganosiloxane at 25° C. is 50-2,000 mPa·s. In a solution, there are 10-30 parts by weight of a bivinyl-terminated polyorganosiloxane in the modified polyorganosiloxane. 
         [0044]    A (V) Catalyst 
         [0045]    The catalyst is one selected from the group consisting of platinum-alcohol complex, platinum-olefin complex, platinum-alkoxide complex, platinum-ether complex, platinum-ketone complex, isopropanol solution of chloroplatinic acid or platinum-vinyl complex. The catalyst in this process is preferably an isopropanol solution of chloroplatinic acid with the platinum content of 1-20 ppm. In a solution, the mass ratio of a catalyst in the modified polyorganosiloxane is 0.01-0.2%. 
         [0046]    Component Al: The modified polyorganosiloxane A1 is obtained through reaction of the above hydrogen-containing polyorganosiloxane A (I), unsaturated polyether A (II), and α-olefin A (III), as well as a catalyst A (V), in a reactor at 80-180° C. for 0.5-3hours. 
         [0047]    In a solution, there are 5-25 parts by weight of a modified polyorganosiloxane Al in an organosilicone defoaming agent. 
         [0048]    Component A2: The modified polyorganosiloxane A2 is obtained through reaction of the above hydrogen-containing polyorganosiloxane A (I), unsaturated polyether A (II), and bivinyl-terminated polyorganosilicone A (IV), as well as a catalyst A (V), in a reactor at 80-180° C. for 0.5-3hours. 
         [0049]    In a solution, there are 5-25 parts by weight of a modified polyorganosiloxane A2 in an organosilicone defoaming agent. 
         [0050]    B. Organosilicon Composition 
         [0051]    The organoilicone composition according to the present invention is prepared from a hydrogen-containing polyorganosiloxane, an acrylate, a catalyst, an α-olefin, silica, and an MQ resin using a prior art known to those skilled in the art. In a solution, there are 2-20 parts by weight of an organoilicone composition in a defoaming agent, preferably 5-20 parts by weight, more preferably 8-15 parts by weight. 
         [0052]    The range of choice of the hydrogen-containing polyorganosiloxane is the same as above, i,e. A(I). In a solution, there are 40-80 parts by weight of the hydrogen-containing polyorganosiloxane in an organosilicon composition. 
         [0053]    The range of choice of the catalyst is the same as above, i.e. A(V), preferably an isopropanol solution of chloroplatinic acid with the platinum content of 1-20 ppm. In a solution, the mass ratio of a catalyst in an organosilicon composition is 0.01-0.2%. 
         [0054]    The range of choice of the α-olefin is the same as above, i.e. A(III). In a solution, there are 10-30 parts by weight of the α-olefin in an organosilicon composition, 
         [0055]    The silica includes hydrophobized or non-hydrophobized fumed silica or precipitated silica having a specific surface area of 50-500 m 2 /g. The precipitated silica or fumed silica having a specific surface area of 90-300 m 2 /g is preferable in the present invention. In a solution, there are 1-15 parts by weight of silica in an organoilicone composition, 
         [0056]    The organosilicon resin refers to a highly cross-linked polyorganosiloxane having a spatial mesh structure, and the polyorganosiloxane having a spatial mesh structure is usually obtained through obtaining an acidic hydrolysate by hydrolyzing various mixtures of methyltrichlorosilane, dimethyldichlorosilane, phenyltrichlorosilane, diphenyldichlorosilane and methylphenyldichlorosilane in an organic solvent, such as toluene, and then removing acid by washing with water. The organosilicon resin used in the present invention is an MQ resin composed of chain units CH 3 SiO 1/2  (called M units in organosilicone chemistry) and chain units SiO 4/2 (Q units), and the molar ratio between the two is (0.4-1,2): 1.0, preferably (0.5-0.8): 1.0. In a solution, there are 5-20 parts by weight of an MQ resin in an organoilicone composition. 
         [0057]    The acrylate is esters of acrylic acid and its homologue, including methyl acrylate, ethyl acrylate, butyl acrylate, isobutyl acrylate, 2-methyl methacrylate, 2-ethyl methacrylate and 2-butyl methacrylate. In a solution, there are 3-15 parts by weight of an acrylate in an organoilicone composition. 
         [0058]    A specific preparation process of an organoilicone composition B (i.e. component B) is as follows: firstly the above hydrogen-containing polyorganosiloxane is fully mixed with an acrylate, to which a catalyst is added at 70° C. Then, after the system is heated to 100° C. and kept at the temperature for 1 hour, an α-olefin is added thereto, and further kept at the temperature for 2 hours. Finally, silica and an organosilicon resin are added and mixed to obtain the organoilicone composition 1. 
         [0059]    C. Thickening Agent 
         [0060]    The thickening agent is selected from the group consisting of polyacrylamide, carbomer, xanthan, cellulose and polyacrylic acid. Polyacrylic acid thickening agent is preferably used in the present invention to thicken the system by regulating the pH value using an alkali and controlling the viscosity of the system to 1000-5000mPa·s. In a solution, there are 0.5-5 parts by weight of a thickening agent in a defoaming agent. 
         [0061]    D. Water: The water is deionized water. In a solution, there are 50-90 parts by weight of water in a defoaming agent. The mass content of water in a defoaming agent can be 50-90%. 
         [0062]    E. Emulsifier 
         [0063]    The emulsifier is an anionic, cationic or non-ionic surfactant, preferably a non-ionic surfactant. 
         [0064]    The non-ion surfactant is selected from the group consisting of polyoxyethylenenonylphenyl ether, polyoxyethyleneoctylphenol ether, polyoxyethylene lauryl ether, polyoxyethyleneoleyl ether, sorbitanmonstearate, sorbitanmionooleate, sorbitantristearate, sorbitantrioleate, polyoxyethylenesorbitanmonostearate, polyoxyethylenesorbitanmonooleate, polyoxyethylenesorbitantristearate, and polyoxyethylene castor oil. The emulsifiers may be used separately, or mixed before use. 
         [0065]    In a solution, there are 1-10 parts by weight of an emulsifier in an organosilicone defoaming agent. 
         [0066]    F. Preservative 
         [0067]    The preservative is one or more selected from the group consisting of methyl-p-hydroxybenzoate, ethyl-p-hydroxybenzoate, propyl-p-hydroxybenzoate, butyl-p-hydroxybenzoate, sodium diacetate, benzoic acid and sodium salt thereof, sorbic acid and potassium salt thereof, dimethyl fumarate, 2-methyl-4-isothiazolin-3-one, 5-chloro-2-methyl-4-isothiazolin-3-one, 4,5-dichloro-2-methyl-4-isothiazolin-3-one, 2-n-octyl-4-isothiazoline-3-one, 4,5-dichloro-2-n-octyl-4-isothiazolin-3-one, 5-chloro-2-n-octyl-4-isothiazolin-3-one, 1,2-benzo-isothiazolin-3-one, n-nutyl-1,2-benzo-isothiazolin-3-one, and 2-methyl-4,5-propylidene-4-isothiazolin-3-one. The preservatives may be used separately, or any two or more of them may be mixed before use. 
         [0068]    In a solution, there are 0.01-0.5 parts by weight of an preservative in an organosilicone defoaming agent. 
         [0069]    In the present invention, a defoaming agent can be prepared by controlling its pH value in an appropriate range according to an existing method, so as to facilitate preparation, production or use of the defoaming agent, wherein the pH range is generally 5.0-7.0, preferably 6.5-7.0. The pH value of defoaming can be regulated using an acid or alkali commonly used in this field. 
         [0070]    In a technical solution, the defoaming agent of the present invention can be prepared using the following process: a modified polyorganosiloxane Al, a modified polyorganosiloxane A2 and an organosilicon composition B are mixed, heated to 50 -80° C., and fully stirred; then in the case of keeping a constant temperature while stirring, a part of a thickening agent and water are added, and the pH value is regulated to 6.5-7.0; finally, the emulsion thus obtained is homogenized, and the balance amount of the thickening agent and water are added. The amount of the first added thickening agent is 70-90% based on the total mass of the thickening agent, and the amount of the first added water is 30-60% based on the total mass of water. 
         [0071]    In a technical solution, a defoaming agent of the present invention can be prepared specifically using a process comprising the following steps: 
         [0072]    (1) The above modified polyorganosiloxane A1 and A2, and organosilicon composition B are mixed, heated to 50 -80° C., and stirred at a stirring speed of 100400 rpm for 0.5-1.5hours; 
         [0073]    (2)In the case of keeping a constant temperature, 30-60% of water and 70-90% of a thickening agent are added while stirring, and the pH is regulated to 6.5-7.0; 
         [0074]    (3) The above emulsion is homogenized using a colloid mill, and diluted with the balance amount of the thickening agent and water to obtain the defoaming agent product. 
         [0075]    When an organosilicone defoaming agent of the present invention contains an emulsifier, the emulsifier is generally mixed with A1 and A2 before addition. When an organosilicone defoaming agent of the present invention contains a preservative, the preservative is finally added to the product. 
         [0076]    The inventor found that in the process of preparing a defoaming agent of an organosilicon composition having an alkyl-modified group, modified polyorganosiloxane A1 and A2 arc compounded, and the compatibility and synergistic effect between the two and other components enable the obtained defoaming agent emulsion to have a good defoaming performance, clarity and excellent stability in a liquid detergent, so as to ensure that the defoaming agent neither precipitates, nor agglomerates in a laundry detergent, and effectively solve the phenomenon, such as coagulation and aggregation. 
         [0077]    There are many other different combinations of modified polyorganosiloxane. The compounding effects are all worse than the compounding effect of the modified polyorganosiloxane A 1 and A2 according to the present invention. Different combinations of modified polyorganosiloxane will exhibit different properties, which will be described specifically through examples and comparative examples. 
     
    
     DETAILED DESCRIPTION 
       [0078]    In the following examples, the monomers used in a modified polyorganosiloxane are respectively as follows: 
         [0079]    A(I) Hydrogen-Containing Polyorganosiloxane: 
         [0080]    H s Me 3-c SiO(MeHSiO) a (Me 2 SiO) b SiMe 3-c H c ; 
         [0081]    A (II) Unsaturated polyether: ViCH 2 O(EO) x (PO) y R 1 ; 
         [0082]    A(III) α-olefin Vi(CH 2 ) z H; 
         [0083]    A(IV) Bivinyl-terminated polyorganosilicone: Vi(R 2 ) 2 SiO((R 2 ) 2 SiO) m Si(R 2 ) 2 Vi. 
         [0084]    Please see Table 1 for details of specifically used materials. 
         [0000]    
       
         
               
             
               
               
             
               
               
               
               
               
             
               
               
               
               
               
               
               
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
               
               
               
               
               
               
             
           
               
                 TABLE 1 
               
             
             
               
                   
               
               
                 Components A1-1 to A1-4, A2-5 to A2-8 and A-9 to A-14 of a modified polysiloxane 
               
             
          
           
               
                   
                 Monomer 
               
             
          
           
               
                 General 
                 A(I) 
                 A(II) 
                 A(III) 
                 A(IV) 
               
             
          
           
               
                 formula/use 
                   
                   
                   
                 Use 
                   
                   
                   
                 Use 
                   
                 Use 
                   
                   
                 Use 
               
               
                 level 
                 a 
                 b 
                 c 
                 level/g 
                 x 
                 y 
                 R 1   
                 level/g 
                 z 
                 level/g 
                 m 
                 R 2   
                 level/g 
               
               
                   
               
             
          
           
               
                 A1-1 
                 15 
                 45 
                 0 
                 250 
                 0 
                 50 
                 —CH 3   
                 230  
                 8 
                 120 
                 — 
                 — 
                 0 
               
               
                 A1-2 
                 65 
                 190 
                 1 
                 250 
                 20 
                 0 
                 —H 
                 120 
                 16 
                 230 
                 — 
                 — 
                 0 
               
               
                 A1-3 
                 100 
                 170 
                 1 
                 300 
                 35 
                 90 
                 —NH 3   
                 200 
                 12 
                 100 
                 — 
                 — 
                 0 
               
               
                 A1-4 
                 30 
                 150 
                 0 
                 450 
                 30 
                 70 
                 —CH 3   
                 90 
                 16 
                 60 
                 — 
                 — 
                 0 
               
               
                 A2-5 
                 15 
                 45 
                 0 
                 250 
                 0 
                 50 
                 —CH 3   
                 250 
                 — 
                 0 
                 210 
                 —CH 3   
                 100 
               
               
                 A2-6 
                 65 
                 190 
                 1 
                 250 
                 20 
                 0 
                 —H 
                 230 
                 — 
                 0 
                 390 
                 —CH 3   
                 120 
               
               
                 A2-7 
                 100 
                 170 
                 1 
                 300 
                 35 
                 90 
                 —NH 3   
                 150 
                 — 
                 0 
                 280 
                 —CH 3   
                 150 
               
               
                 A2-8 
                 30 
                 150 
                 0 
                 400 
                 30 
                 70 
                 —CH 3   
                 100 
                 — 
                 0 
                 340 
                 —CH 3   
                 100 
               
               
                 A-9 
                 15 
                 45 
                 0 
                 250 
                 0 
                 50 
                 —CH 3   
                 200 
                 8 
                 100 
                 210 
                 —CH 3   
                 50 
               
               
                 A-10 
                 65 
                 190 
                 1 
                 250 
                 20 
                 0 
                 —CH 3   
                 150 
                 16 
                 130 
                 390 
                 —CH 3   
                 70 
               
               
                 A-11 
                 100 
                 170 
                 1 
                 300 
                 35 
                 90 
                 —CH 3   
                 120 
                 12 
                 80 
                 280 
                 —CH 3   
                 100 
               
               
                 A-12 
                 30 
                 150 
                 0 
                 350 
                 30 
                 70 
                 —CH 3   
                 90 
                 16 
                 60 
                 340 
                 —CH 3   
                 50 
               
               
                 A-13 
                 100 
                 170 
                 1 
                 300 
                 35 
                 90 
                 —CH 3   
                 300 
                 — 
                 0 
                 — 
                 — 
                 0 
               
               
                 A-14 
                 30  
                 150 
                 0 
                 450 
                 30 
                 70 
                 —CH 3   
                 150 
                 — 
                 0 
                 — 
                 — 
                 0 
               
               
                   
               
               
                 Note: 
               
               
                 The dynamic viscosity of the above A(I) hydrogen-containing polyorganosiloxane at 25° C. is 50-5,000 mPa · s; the dynamicviscosity of the A (IV) bivinyl-terminated polyorganosiloxane at 25° C. is 100-2,000 mPa · s. 
               
             
          
         
       
     
         [0085]    Modified polysiloxane A1-1 to A1-4 (i.e. A1-1, A1-2, A1-3 and A1-4) are prepared through reaction of A (I), A (II) and A (III) after mixing them, A2-5 to A2-8 (i.e. A2-5, A2-6, A2-7 and A2-8) are prepared through reaction of A (I), A (II) and A (IV) after mixing them, A-9 to A-12 are prepared through reaction of A (I), A (II), A (III) and A (IV) after mixing them, and A-13 and A-14 are prepared through reaction of A and A (II) after mixing them. 
         [0086]    The preparation process of each modified polysiloxane comprises first adding the above use level of A (I), A (II), A (III) and A (IV), as well as a catalyst A (V), in a reactor at 80-180° C. for 0.5-3hours. The catalyst A (V) is an isopropanol solution of chloroplatinic acid with the platinum content of 5-15 ppm. In preparing A1-1 to A1-4 modified polysiloxane, the reaction temperature is 100-110° C., and the use level of the catalyst is 0.05-0.08% based on the mass of the modified polysiloxane. In preparing A2-5 to A2-8, the reaction temperature is 110-130° C., and the use level of the catalyst is 0.04-0.06% based on the mass of the modified polysiloxane. In preparing A-9 to A-12, the reaction temperature is 100-110° C., and the use level of the catalyst is 0.05-0.08% based on the mass of the modified polysiloxane. 
         [0087]    Organosilicon composition B1 was prepared as follows: 
         [0088]    50 g of hydrogen-containing polyorganosiloxane 3 SiO(MeHSiO) 15 (Me 2 SiO) 45 SiMe 3  was fully mixed with 12 g of methyl acrylate, to which a catalyst isopropanol solution of chloroplatinic acid (platinum content: 10-15 ppm) was added at 70° C., wherein the use level of the catalyst was 0.05% based on the mass of the composition. The system was heated to 100° C. and kept at the temperature for 1 hour, and then 28 g of α-olefin Vi(CH 2 ) 8 H was added thereto. Finally, 13 g of precipitated silica (60m 2 /g) and 5 g of an MQ silicon resin (molar ratio of M to Q=0.5:1.0) were added and mixed to obtain the target product. 
         [0089]    Organosilicon composition B2 was prepared as follows: 60 g of hydrogen-containing polyorganosiloxaneHMe 2 SiO(MeHSiO) 65 (Me 2 SiO) 190 SiMe 2 H and 14 g of methyl acrylate were fully mixed, to which a catalyst isopropanol solution of chloroplatinic acid (platinum content: 10-15 ppm) was added at 69° C., 
         [0090]    wherein the use level of the catalyst was 0.05% based on the mass of the composition. The system was heated to 100° C. and kept at the temperature for 1 hour, and then 20 g of α-olefin Vi(CH 2 ) 16 H. was added thereto. Finally, 10 g of fumed silica (80 m 2 /g) and 10 g of an MQ silicon resin (molar ratio of M to Q=0.6: 1.0) were added and mixed to obtain the target product. 
         [0091]    Organosilicon composition 133 was prepared as follows: 
         [0092]    70 g of hydrogen-containing polyorganosiloxaneHMe 2 SiO(MeHSiO) 100 (Me 2 SiO) 170 SiMe 2 H was fully mixed with 10 g of ethyl acrylate, to which a catalyst isopropanol solution of chloroplatinic acid (platinum content: 10-15 ppm) was added at 71° C., wherein the use level of the catalyst was 0.05% based on the mass of the composition. The system was heated to 100° C. and kept at the temperature for 1 hour, and then 12 g of a -olefin Vi(CH 2 ) 12 H was added thereto. Finally, 3 g of fumed silica (100 m 2 /g) and 20 g of an MQ silicon resin (molar ratio of M to Q=0.7: 1.0) were added and mixed to obtain the target product. 
         [0093]    Organosilicon composition B4 was prepared as follows: 
         [0094]    50 g of hydrogen-containing polyorganosiloxaneMe 3 SiO(MeHSiO) 30 (MeSiO) 150 SiMe 3  was fully mixed with 5 g of butyl acrylate, to which a catalyst isopropanol solution of chloroplatinic acid (platinum content: 10-15 ppm) was added at 70° C., wherein the use level of the catalyst was 0.05% based on the mass of the composition. The system was heated to 100° C. and kept at the temperature for 1 hour, and then 28 g of α-olefin Vi(CH 2 ) 8 H was added thereto. Finally, 13 g of fumed silica(200 m 2 /g) and 5 g of an MQ silicon resin (molar ratio of M to Q=0.9: 1.0) were added and mixed to obtain the target product. 
         [0095]    Organosilicon composition B5 was prepared as follows: 
         [0096]    60 g of hydrogen-containing polyorganosiloxanaMe 2 SiO(MeHSiO) 65 (Me 2 SiO) 190 SiMe 2 H was fully mixed with 10 g of ethyl methacrylate, to which a catalyst isopropanol solution of chloroplatinic acid (platinum content: 10-15 ppm) was added at 70° C., wherein the use level of the catalyst was 0.05% based on the mass of the composition. The system was heated to 100° C. and kept at the temperature for 1 hour, and then 12 g of α-olefin Vi(CH 2 ) 12 H was added thereto. Finally, 3 g of precipitated silica (300m 2 /g) and 18 g of an MQ silicon resin (molar ratio of M to Q=0.8: 1.0) were added and mixed to obtain the target product. 
         [0097]    Organosilicon composition 116 was prepared as follows: 
         [0098]    70 g of hydrogen-containing polyorganosiloxaneHMe 2 SiO(MeHSiO) 100 (Me 2 SiO) 170 SiMe 2 H was fully mixed with 10 g of methyl acrylate, to which a catalyst isopropanol solution of chloroplatinic acid (platinum content: 10-15 ppm) was added at 70° C., wherein the use level of the catalyst was 0.05% based on the mass of the composition. The system was heated to 100° C. and kept at the temperature for 1 hour, and then 20 g of α-olefin Vi(CH 2 ) 16 H was added thereto. Finally, 10 g of precipitated silica (300 m 2 /g) and 10 g of an MQ silicon resin (molar ratio of M to Q=0.6: 1.0) were added and mixed to obtain the target product. 
         [0099]    Please refer to the prior art for the composition, operating conditions and the like that are not dearly mentioned in the following examples. 
       EXAMPLES 1-10 
       [0100]    The defoaming agent products in examples 1-10 were respectively prepared as per the formulae in Table 2. 
         [0000]    
       
         
               
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
               
               
             
           
               
                 TABLE 2 
               
               
                   
               
               
                   
                 Component 
                   
                   
                 Component 
                   
                   
                 Defoaming 
               
               
                   
                 A 
                 Component 
                   
                 D 
                   
                   
                 agent 
               
               
                 Example 
                 and use 
                 B and 
                 Component C 
                 and use  
                 Component E 
                 Component F 
                 solid 
               
               
                 Group 
                 level 
                 use level 
                 and use level 
                 level 
                 and use level 
                 and use level 
                 content 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                 Example 
                 A1-1 
                 A2-5 
                 B1 
                  9 g 
                 Polyacrylic acid 
                 Water 60 g 
                 — 
                 — 
                 40% 
               
               
                 1 
                 10 g 
                 20 g 
                   
                   
                 thickening agent 
                   
                   
                   
                   
               
               
                   
                   
                   
                   
                   
                 1 g 
                   
                   
                   
                   
               
               
                 Example 
                 A1-2 
                 A2-6 
                 B2 
                 13 g 
                 Polyacrylic acid 
                 Water 60 g 
                 — 
                 — 
                 40% 
               
               
                 2 
                 10 g 
                 16 g 
                   
                   
                 thickening agent 
                   
                   
                   
                   
               
               
                   
                   
                   
                   
                   
                 1 g 
                   
                   
                   
                   
               
               
                 Example 
                 A1-3 
                 A2-8 
                 B3 
                 13 g 
                 Polyacrylic acid 
                 Water 60 g 
                 — 
                 — 
                 40% 
               
               
                 3 
                 10 g 
                 16 g 
                   
                   
                 thickening agent 
                   
                   
                   
                   
               
               
                   
                   
                   
                   
                   
                 1 g 
                   
                   
                   
                   
               
               
                 Example 
                 A1-4 
                 A2-7 
                 B4 
                 13 g 
                 Carbomer 
                 Water 60 g 
                 — 
                 — 
                 40% 
               
               
                 4 
                 10 g 
                 16 g 
                   
                   
                 1 g 
                   
                   
                   
                   
               
               
                 Example 
                 A1-1 
                 A2-8 
                 B4 
                 13 g 
                 Polyacrylamide 
                 Water 60 g 
                 — 
                 — 
                 40% 
               
               
                 5 
                 10 g 
                 16 g 
                   
                   
                 1 g 
                   
                   
                   
                   
               
               
                 Example 
                 A1-1 
                 A2-5 
                 B1 
                 10 g 
                 Polyacrylic acid 
                 Water 70 g 
                 — 
                 — 
                 30% 
               
               
                 6 
                 10 g 
                  9 g 
                   
                   
                 thickening agent 
                   
                   
                   
                   
               
               
                   
                   
                   
                   
                   
                 1 g 
                   
                   
                   
                   
               
               
                 Example 
                 A1-1 
                 A2-5 
                 B1 
                 9 g 
                 Polyacrylic acid 
                 Water 80 g 
                 — 
                 — 
                 20% 
               
               
                 7 
                  4 g 
                  6 g 
                   
                   
                 thickening agent 
                   
                   
                   
                   
               
               
                   
                   
                   
                   
                   
                 1 g 
                   
                   
                   
                   
               
               
                 Example 
                 A1-1 
                 A2-5 
                 B1 
                 10 g 
                 Polyacrylic acid 
                 Water 60 g 
                 Sorbitan stearate 
                 — 
                 40% 
               
               
                 8 
                 10 g 
                 15 g 
                   
                   
                 thickening agent 
                   
                 60 2 g 
                   
                   
               
               
                   
                   
                   
                   
                   
                 1 g 
                   
                 Polyoxyethylene 
                   
                   
               
               
                   
                   
                   
                   
                   
                   
                   
                 sorbitan- 
                   
                   
               
               
                   
                   
                   
                   
                   
                   
                   
                 monostearate 60 2 g 
                   
                   
               
               
                 Example 
                 A1-1 
                 A2-5 
                 B1 
                 10 g 
                 Polyacrylic acid 
                 Water 60 g 
                 Polyoxyethylene 
                 — 
                 40% 
               
               
                 9 
                 10 g 
                 15 g 
                   
                   
                 thickening agent 
                   
                 lauryl ether 4 g 
                   
                   
               
               
                   
                   
                   
                   
                   
                 1 g 
                   
                   
                   
                   
               
               
                 Example 
                 A1-1 
                 A2-5 
                 B1 
                  9 g 
                 Polyacrylic acid 
                 Water 70 g 
                 Sorbitan stearate 
                 2-methyl-4- 
                 30% 
               
               
                 10  
                  7 g 
                  9 g 
                   
                   
                 thickening agent 
                   
                 60 2 g 
                 isothiazolin- 
                   
               
               
                   
                   
                   
                   
                   
                 0.7 g   
                   
                 Polyoxyethylene 
                 3-one 
                   
               
               
                   
                   
                   
                   
                   
                   
                   
                 sorbitan 
                 0.3 
                   
               
               
                   
                   
                   
                   
                   
                   
                   
                 monostearate 60 
                   
                   
               
               
                   
                   
                   
                   
                   
                   
                   
                  2 g 
               
               
                   
               
             
          
         
       
     
         [0101]    The water in the above table was deionized water. 
         [0102]    The preparation process in Examples 1-3: The component A and component B in Table were mixed, heated to 55-60° C., and fully stirred; the system was kept at a constant temperature, 40-50% of the component D and 90% of the component C were slowly added. thereto while stirring, and the pH was regulated to 6.5-7. The above emulsion was homogenized, and was diluted with the balance amount of the component C and component D to obtain the defoaming agent product with corresponding solid content. 
         [0103]    The preparation process in Examples 4-7: The component A and component B in Table 2 were mixed, heated to 60-70° C., and fully stirred; the system was kept at a constant temperature, 30-35% of the component I) and 85% of the component C were slowly added thereto while stirring, and the pH was regulated to 6.5-7. The above emulsion was homogenized, and was diluted with the balance amount of the component C and component D to obtain the defoaming agent product with corresponding solid content. 
         [0104]    The Preparation process in. Examples 8-9: The component A, component B and component E in Table 2 were mixed, heated to 50-80° C., and fully stirred; the system was kept at a constant temperature, 45-50% of the component D and 90% of the component C were slowly added thereto while stirring, and the pH was regulated to 6.5-7. The above emulsion was homogenized, and was diluted with the balance amount of the component C and component D to obtain the defoaming agent product with corresponding solid content. 
         [0105]    The preparation process in Example 10: The component A, component B and component E in Table 2 were mixed, heated to 50-80° C., and fully stirred; the system was kept at a constant temperature, 30-40% of the component D and 85% of the component C were slowly added thereto while stirring, and the pH was regulated to 6.5-7. The above emulsion was homogenized, and was diluted with the balance amount of the component C and component D, and then the component F was added to obtain the defoaming agent product with corresponding solid content. 
       COMPARATIVE EXAMPLES 1-14 
       [0106]    The defoaming agents in comparative examples 1-14 were respectively prepared as per the formulae in Table 3. In each comparative example, the defoaming agent with corresponding solid content was prepared respectively using the process in Example 1 or Example 9. 
         [0000]    
       
         
               
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
             
           
               
                 TABLE 3 
               
             
             
               
                   
               
               
                   
                   
                   
                   
                   
                   
                   
                 Defoaming 
               
             
          
           
               
                 Comparative 
                 Component A 
                 Component B 
                 Component C  
                 Component D 
                 Component E 
                 agent 
               
               
                 example group 
                 and use level 
                 and use level 
                 and use level 
                 and use level 
                 and use level 
                 solid content 
               
               
                   
               
             
          
           
               
                 Comparative 
                 A1-1 
                 — 
                 B1 9 g 
                 Polyacrylic 
                 Water 60 g 
                   
                 40% 
               
               
                 example 1 
                 30 g 
                   
                   
                 acid thickening 
                   
                   
                   
               
               
                   
                   
                   
                   
                 agent 1 g 
                   
                   
                   
               
               
                 Comparative 
                 — 
                 A2-6 
                 B1 9 g 
                 Polyacrylic 
                 Water 60 g 
                   
                 40% 
               
               
                 example 2 
                   
                 30 g 
                   
                 acid thickening 
                   
                   
                   
               
               
                   
                   
                   
                   
                 agent 1 g 
                   
                   
                   
               
               
                 Comparative 
                 — 
                 A-9 
                 B1 9 g 
                 Polyacrylic 
                 Water 60 g 
                   
                 40% 
               
               
                 example 3 
                   
                 30 g 
                   
                 acid thickening 
                   
                   
                   
               
               
                   
                   
                   
                   
                 agent 1 g 
                   
                   
                   
               
               
                 Comparative 
                 — 
                 A-13 
                 B19 g 
                 Polyacrylic 
                 Water 60 g 
                   
                 40% 
               
               
                 example 4 
                   
                 30 g 
                   
                 acid thickening 
                   
                   
                   
               
               
                   
                   
                   
                   
                 agent 1 g 
                   
                   
                   
               
               
                 Comparative 
                 A1-1 
                 A-13 
                 B19 g 
                 Polyacrylamide 
                 Water 60 g 
                   
                 40% 
               
               
                 example 5 
                 10 g 
                 20 g 
                   
                 1 g 
                   
                   
                   
               
               
                 Comparative 
                 A1-4 
                 A-9 
                 B19 g 
                 Polyacrylic 
                 Water 60 g 
                   
                 40% 
               
               
                 example 6 
                 10 g 
                 20 g 
                   
                 acid thickening 
                   
                   
                   
               
               
                   
                   
                   
                   
                 agent 1 g 
                   
                   
                   
               
               
                 Comparative 
                 A2-5 
                 A-10 
                 B19 g 
                 Polyacrylic 
                 Water 60 g 
                   
                 40% 
               
               
                 example 7 
                 10 g 
                 20 g 
                   
                 acid thickening 
                   
                   
                   
               
               
                   
                   
                   
                   
                 agent 1 g 
                   
                   
                   
               
               
                 Comparative 
                 A2-6 
                 A-12 
                 B19 g 
                 Polyacrylic 
                 Water 60 g 
                   
                 40% 
               
               
                 example 8 
                 10 g 
                 20 g 
                   
                 acid thickening 
                   
                   
                   
               
               
                   
                   
                   
                   
                 agent 1 g 
                   
                   
                   
               
               
                 Comparative 
                 A1-1 
                 A-13 
                 B110 g 
                 Polyacrylic 
                 Water 70 g 
                   
                 30% 
               
               
                 example 9 
                 10 g 
                  9 g 
                   
                 acid thickening 
                   
                   
                   
               
               
                   
                   
                   
                   
                 agent 1 g 
                   
                   
                   
               
               
                 Comparative 
                 A2-6 
                 A-14 
                 B17 g 
                 Polyacrylamide 
                 Water 80 g 
                   
                 20% 
               
               
                 example 10 
                  5 g 
                  7 g 
                   
                 1 g 
                   
                   
                   
               
               
                 Comparative 
                 A-10 
                 A-14  
                 B1 9 g 
                 Polyacrylic 
                 Water 60 g 
                   
                 40% 
               
               
                 example 11 
                 10 g 
                 20 g 
                   
                 acid thickening 
                   
                   
                   
               
               
                   
                   
                   
                   
                 agent 1 g 
                   
                   
                   
               
               
                 Comparative 
                 A1-1 
                   
                 B1 10 g 
                 Polyacrylic 
                 Water 60 g 
                 Sorbitan stearate 
                 40% 
               
               
                 example 12 
                 26 g 
                   
                   
                 acid thickening 
                   
                 60 2 g 
                   
               
               
                   
                   
                   
                   
                 agent 1 g 
                   
                 Polyoxyethylene 
                   
               
               
                   
                   
                   
                   
                   
                   
                 sorbitan 
                   
               
               
                   
                   
                   
                   
                   
                   
                 monostearate 60 
                   
               
               
                   
                   
                   
                   
                   
                   
                 2 g 
                   
               
               
                 Comparative 
                 A1-1 
                 — 
                 B3 9 g 
                 Polyacrylic 
                 Water 60 g 
                 — 
                 40% 
               
               
                 example 13 
                 30 g 
                   
                   
                 acid thickening 
                   
                   
                   
               
               
                   
                   
                   
                   
                 agent 1 g 
                   
                   
                   
               
               
                 Comparative 
                 A1-1 
                 A-13 
                 B5 9 g 
                 Polyacrylic 
                 Water 60 g 
                 — 
                 40% 
               
               
                 example 14 
                 10 g 
                 20 g 
                   
                 acid thickening 
                   
                   
                   
               
               
                   
                   
                   
                   
                 agent 1 g 
               
               
                   
               
             
          
         
       
     
         [0107]    Performance test of the defoaming agent obtained in each example was respectively made as follows, 
         [0108]    Performance test of an organosilicone defoaming agent: 
         [0109]    (1) Machine Wash Performance Test in a Liquid Detergent 
         [0110]    The washing machine used in the test was a drum washing machine of Zanussi brand, model: ZWH6125, capacity: 7 kg. Test method: 50 g of detergent available on the market, 0.1 g of the prepared orgnaosilicone emulsion and 20 kg of water were added to the washing machine, and then the program for cotton and linen was selected. The view window of the washing machine is marked with 5 scale values, respectively representing 0, 25%, 50%, 75% and 100% height of the view window, “0” is the start representing no foam, while “100%” represents full of foam. The foam height was recorded once every 5minutes, and was recorded at the time of stop. The higher the value is, the foam scale value in the washing machine is, and the worse the defoaming performance is; the lower the foam scale value in equivalent time is, the better the defoaming performance of the product is. The test results are shown in Table 4. 
         [0000]    
       
         
               
               
             
               
               
               
               
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
               
               
               
             
           
               
                 TABLE 4 
               
             
             
               
                   
               
               
                   
                 Time/min 
               
             
          
           
               
                   
                 5 
                 10 
                 15 
                 90 
                 25 
                 30 
                 35 
                 40 
                 45 
                 50 
               
               
                   
               
             
          
           
               
                 Example 1 
                 17 
                 24 
                 29 
                 33 
                 37 
                 43 
                 48 
                 54 
                 56 
                 59 
               
               
                 Example 3 
                 15 
                 23 
                 39 
                 34 
                 36 
                 41 
                 45 
                 49 
                 55 
                 58 
               
               
                 Example 6 
                 20 
                 26 
                 33 
                 37 
                 40 
                 44 
                 53 
                 59 
                 61 
                 66 
               
               
                 Example 7 
                 23 
                 30 
                 35 
                 41 
                 45 
                 49 
                 52 
                 57 
                 65 
                 73 
               
               
                 Example 9 
                 19 
                 22 
                 32 
                 35 
                 40 
                 42 
                 47 
                 52 
                 57 
                 60 
               
               
                 Comparative 
                 21 
                 26 
                 30 
                 36 
                 39 
                 45 
                 52 
                 56 
                 59 
                 64 
               
               
                 example 1 
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
               
               
                 Comparative 
                 23 
                 29 
                 32 
                 37 
                 40 
                 45 
                 54 
                 59 
                 62 
                 66 
               
               
                 example 2 
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
               
               
                 Comparative 
                 20 
                 24 
                 29 
                 34 
                 40 
                 44 
                 54 
                 59 
                 62 
                 65 
               
               
                 example 3 
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
               
               
                 Comparative 
                 28 
                 32 
                 39 
                 45 
                 49 
                 54 
                 57 
                 62 
                 69 
                 76 
               
               
                 example 4 
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
               
               
                 Comparative 
                 24 
                 29 
                 32 
                 36 
                 38 
                 44 
                 49 
                 54 
                 59 
                 64 
               
               
                 example 5 
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
               
               
                 Comparative 
                 25 
                 30 
                 34 
                 37 
                 39 
                 47 
                 51 
                 54 
                 62 
                 67 
               
               
                 example 7 
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
               
               
                 Comparative 
                 26 
                 32 
                 37 
                 45 
                 49 
                 53 
                 57 
                 62 
                 66 
                 68 
               
               
                 example 9 
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
               
               
                 Comparative 
                 26 
                 34 
                 37 
                 48 
                 52 
                 55 
                 60 
                 63 
                 67 
                 70 
               
               
                 example 10 
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
               
               
                 Comparative 
                 39 
                 35 
                 41 
                 45 
                 49 
                 54 
                 59 
                 65 
                 71 
                 79 
               
               
                 example 12 
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
               
               
                 Comparative 
                 40 
                 45 
                 49 
                 53 
                 58 
                 64 
                 68 
                 72 
                 76 
                 80 
               
               
                 example 14 
               
               
                   
               
             
          
         
       
     
         [0111]    The defoaming performance of the defoaming agent in Examples 2, 4-5, 8 and 10 is close to or equivalent to that of the defoaming agent in Example 1. The comparison in Table 4 shows that there are excellent compatibility and synergistic effect between the components A1 and A2 in the defoaming agent. The defoaming performance of the defoaming agent in the vast majority of examples is far better or better than that of the defoaming agent using only a single component A or using a combination that has a structure close to the structure of A1 and A2, but is not A1 or A2 in the comparative examples, 
         [0112]    (2) Compatibility: 1% organosilicone defoaming agent emulsion was added to the detergent samples. After fully stirring, the samples were observed whether to have floating oil or aggregates. After kept at 40° C. for a week, the mixture state was visually observed. The test results were shown in Table 5. 
         [0113]    Visual observation as per the following grades: 
         [0114]    1=Clear without floating oil on the surface or container “annulus”. 
         [0115]    2=A little annulus or floating oil on the surface; redispersible in a detergent. 
         [0116]    3=Moderate amount of annulus or floating oil on the surface; difficult to be dispersed again. 
         [0117]    4=Obvious annulus or floating oil on the surface; very difficult to be dispersed again. 
         [0118]    5=Visually observed aggregation or flocculation of siloxane; and unable to be dispersed again, 
         [0119]    (3) Clarity test: 0.5% emulsion was added to a laundry detergent, and fully. stirred. After foams fully disappeared, the transparency level was observed with white paper as a substrate, and was graded as 1, 2, 3 and 4, respectively being clear, slightly turbid, turbid and more turbid. The test results were shown in Table 5. 
         [0000]    
       
         
               
               
               
               
             
           
               
                   
                 TABLE 5 
               
               
                   
                   
               
               
                   
                   
                 Compatibility 
                 Clarity 
               
               
                   
                   
               
             
             
               
                   
                 Example 1 
                 1 
                 2 
               
               
                   
                 Example 3 
                 1 
                 2 
               
               
                   
                 Exaniple 6 
                 1 
                 1 
               
               
                   
                 Example 7 
                 1 
                 1 
               
               
                   
                 Example 9 
                 1 
                 2 
               
               
                   
                 Comparative example 1 
                 1 
                 2 
               
               
                   
                 Comparative example 2 
                 4 
                 3 
               
               
                   
                 Comparative example 3 
                 3 
                 2 
               
               
                   
                 Comparative example 4 
                 5 
                 2 
               
               
                   
                 Comparative example 5 
                 3 
                 2 
               
               
                   
                 Comparative example 7 
                 4 
                 2 
               
               
                   
                 Comparative example 9 
                 3 
                 2 
               
               
                   
                 Comparative example 10 
                 4 
                 2 
               
               
                   
                 Comparative example 12 
                 5 
                 3 
               
               
                   
                 Comparative example 14 
                 5 
                 3 
               
               
                   
                   
               
             
          
         
       
     
         [0120]    The compatibility and clarity of the defoaming agent in Examples 2, 4-5, 8 and 10 are close to or equivalent to the compatibility and clarity of the defoaming agent in Example 1. As can be seen from the comparison in Table 5, the compatibility and synergistic effect between the components A1 and A2 in a defoaming agent enable it to be closely bound with an organosilicon composition, not only have a better defoaming performance, but also improve the emulsion stability, and have more prominent advantages in compatibility and clarity. As can be seen from the comparative examples, the effect is far better than that of the defoaming agent using only a single component A or using a combination that has a structure close to the structure of A1 and A2, but is not A1 or A2.