Patent Description:
The solvent-borne or solvent-free two-component coating containing an aspartic ester is widely used and particularly widely used as a floor coating, because the two-component coating has the advantages of weather resistance, wear resistance, humidity and heat resistance and salt spray resistance, and can meet the requirements of high solid contents, low viscosity and environmental protection. The above solvent-borne or solvent-free two-component coatings generally contain a polyisocyanate component in addition to the aspartic ester. In practice, upon mixing the polyisocyanate and the aspartic ester, they react rapidly to form a highly cross-linked, solvent-free polyurea coating, usually within a few seconds to a few minutes. Due to such a short working time, the application of the solvent-borne or solvent-free two-component coating cannot be achieved by means of the application mode such as roll coating and brush coating widely used in the field of floor, and only the special spraying equipment can be used for the application of the solvent-borne or solvent-free two-component coating, so that the cost and difficulty of application are increased, and the utility of the aspartic ester coating in the field of floor and the like is greatly limited.

The current methods for prolonging the working time of the solvent-borne or solvent-free two-component coating containing an aspartic ester mainly comprise: <NUM>) A large amount of active diluent or solvent is added into a coating to reduce the viscosity-increasing speed of the coating so as to ensure a sufficient working time, but many active diluents (such as vinylene carbonate) and solvents have certain toxicity, and the addition of a large amount of active diluent or solvent causes additional environmental pollution and does not meet the trend and the requirement of environmental protection, e.g. as described in <CIT>; <NUM>) A low-activity isocyanate-reactive compound is chosen to extend the working time, but to substantially extend the drying time of the coating and not to meet the drying requirements for industrial applications; <NUM>) A low-activity isocyanate, e.g. macromolecular isocyanate prepolymer, is selected to reduce the reaction activity so as to ensure that the coating has a sufficient working time, but the low-activity isocyanate prepolymer generally has high viscosity, so that not only the application difficulty is increased, but also the drying efficiency of the coating is slowed down, the hardness of the coating layer formed from this kind of coating is low, and the surface of the coating layer cannot be completely dried even for a long time, for example, as described in <CIT>, <CIT>, <CIT> and <CIT>. Therefore, the low-activity isocyanate is only suitable for some applications in the field of polyurethane elastomer or water-proof coating.

<CIT> discloses a polyisocyanate, which is obtained by reacting a diphenylmethane diisocyanate prepolymer with a mono-functional polypropylene polyether alcohol having a number-average molecular weight of <NUM>/mol-<NUM>/mol or a mixture of the mono-functional polypropylene polyether alcohol and a poly-functional polyether alcohol, the polyisocyanate has a high functionality and a low viscosity and contains very little free small-molecular diisocyanate. The polyisocyanate is usually used as a component of one-component or two-component binders or sealants, but are often used in the soft and hard foam industry because of its high drying speed.

<CIT> discloses a process for preparing a polyurethane sealing material, which is obtained by reacting a mono-functional polyoxyethylene polyether alcohol having a number-average molecular weight of <NUM>/mol-<NUM>/mol with a toluene diisocyanate-based polyisocyanate.

The patent applications such as <CIT>, <CIT>, <CIT>, <CIT>, <CIT>, <CIT>, <CIT>, <CIT>, <CIT>, <CIT>, <CIT> and <CIT> also describe techniques for reacting mono-functional polyoxyethylene polyether alcohols and isocyanates to form polyisocyanates. The kind of polyisocyanates can be dispersed in water to be used as cross-linkers in two-component aqueous coatings and adhesives.

The present invention is dedicated to finding a polyisocyanate capable of combining a long working time, a high bubble-free film thickness (BFFT) and fast drying performance, and a high hardness of the coating layer formed from the coating containing the same.

The present invention refers to a polyether-modified polyisocyanate composition and a preparation process thereof, use thereof as the starting component in the preparation of polyurethane, use thereof as the crosslinking component to be used in the solvent-borne or solvent-free coating, adhesive or sealant, use thereof as the starting component to be used in the preparation of the polyisocyanate blocked by a blocking agent, use thereof in improving the working time of the coating, adhesive or sealant, a coating, adhesive or sealant containing the same, in particular a solvent-borne or solvent-free two-component coating containing the same. In the following the solvent-borne or solvent-free two-component coating is also named as solvent-borne or solvent-free two-component coating composition.

The polyether-modified polyisocyanate composition according to the present invention is obtainable by the reaction of a system containing the following components:.

According to one aspect of the present invention, there is provided a process for preparing the polyether-modified polyisocyanate composition provided according to the present invention, characterized in that a system containing component a) polyisocyanate having an isocyanate group functionality of <NUM>-<NUM>, component b) polyoxyalkylene monoether alcohol and optionally component c) catalyst is mixed and reacted to form a polyether-modified polyisocyanate composition having the following characteristics: i) the average isocyanate functionality is <NUM>-<NUM>; ii) the isocyanate group content is <NUM>-<NUM> wt. %, relative to the total weight of the polyisocyanate composition; and iii) the amount of the polyoxyalkylene monoether structure is greater than <NUM> wt. % and less than <NUM> wt. %, relative to the total weight of the polyisocyanate composition; wherein the component a) polyisocyanate contains at least <NUM> wt. % of hexamethylene diisocyanate trimer, pentamethylene diisocyanate trimer or a combination thereof; the component b) polyoxyalkylene monoether alcohol has a number-average molecular weight of <NUM>/mol-<NUM>/mol and an oxypropylene group content of <NUM> wt. %-<NUM> wt. %, relative to the total weight of the oxyalkylene group of the polyoxyalkylene monoether alcohol; the system has an equivalent ratio of isocyanate group to hydroxyl group of <NUM>:<NUM>-<NUM>:<NUM>.

According to another aspect of the present invention, there is provided the use of the polyether-modified polyisocyanate composition provided according to the present invention as the starting component to prepare the polyurethane.

According to another aspect of the present invention, there is provided the use of the polyether-modified polyisocyanate composition provided according to the present invention as the crosslinking component to be used in the solvent-borne or solvent-free coating, adhesive or sealant.

According to another aspect of the present invention, there is provided the use of the polyether-modified polyisocyanate composition provided according to the present invention as the starting component to prepare the polyisocyanate blocked with a blocking agent.

According to another aspect of the present invention, there is provided a coating, adhesive or sealant containing the polyether-modified polyisocyanate composition provided according to the present invention.

According to another aspect of the present invention, there is provided a substrate coated with the coating, adhesive or sealant provided according to the present invention.

According to another aspect of the present invention, there is provided the use of the polyether-modified polyisocyanate composition provided according to the present invention in improving the working time of the coating, adhesive or sealant.

According to another aspect of the present invention, there is provided a solvent-borne or solvent-free two-component coating, which contains an A-component and a B-component, the A-component is a compound containing an isocyanate-reactive group, and the B-component is the polyether-modified polyisocyanate composition provided according to the present invention.

The polyether-modified polyisocyanate composition of the present invention can be applicable to the solvent-borne or solvent-free system.

The coating, adhesive or sealant containing the polyether-modified polyisocyanate composition of the present invention has the advantages of a high bubble-free film thickness (BFFT), a long operable time and high drying efficiency, and a high hardness of the coating layer formed therefrom.

The present invention provides a polyether-modified polyisocyanate composition, which is obtainable by the reaction of a system containing the following components:.

The solvent-free coating, adhesive or sealant herein refers to a coating, adhesive or sealant having a VOC content of less than <NUM>/L.

The term "polyurethane" as used herein refers to polyurethane urea and/or polyurethane polyurea and/or polyurea and/or polythiourethane.

The term "trimer" as used herein refers to a pure trimer, or a mixture of a trimer and its higher homologue containing more than one isocyanurate ring.

The polyether-modified polyisocyanate composition of the present invention can contain a component that is not completely reacted in the system.

The polyether-modified polyisocyanate composition of the present invention is transparent and almost colorless.

The polyether-modified polyisocyanate composition is preferably hydrophobic. Hydrophobic here means incapable of dissolving as well dispersing in water.

The average isocyanate functionality of the polyether-modified polyisocyanate composition is preferably <NUM>-<NUM>.

The isocyanate group content of the polyether-modified polyisocyanate composition is preferably <NUM> wt. %-<NUM> wt. %, most preferably <NUM> wt. %-<NUM> wt. %, relative to the total weight of the polyether-modified polyisocyanate composition.

The isocyanate group (NCO) content is preferably measured according to DIN-EN ISO <NUM>:<NUM>-<NUM>.

The viscosity of the polyether-modified polyisocyanate composition in solvent-free form is preferably 1000mPa·s-2000mPa·s.

The viscosity is preferably determined according to DIN EN ISO <NUM>: <NUM>-<NUM> at <NUM> under a shear rate of <NUM>-<NUM>, with the MV-DIN rotor being chosen.

The amount of the polyoxyalkylene monoether structure of the polyether-modified polyisocyanate composition is preferably greater than <NUM> wt. % and less than <NUM> wt. %, further preferably <NUM> wt. %-<NUM> wt. %, furthermore preferably <NUM> wt. %-<NUM> wt. %, more preferably <NUM> wt. %-<NUM> wt. %, most preferably <NUM> wt. %-<NUM> wt. %, relative to the total weight of the polyether-modified polyisocyanate composition.

The polyether-modified polyisocyanate composition preferably has a color value of less than <NUM>.

The polyether-modified polyisocyanate composition preferably contains no more than <NUM>. % of isophorone diisocyanate trimer, relative to the total weight of the polyether-modified polyisocyanate composition.

Most preferably, the polyether-modified polyisocyanate composition is free of isophorone diisocyanate trimer.

The polyether-modified polyisocyanate composition is preferably an aliphatic-based polyisocyanate composition, a cycloaliphatic-based polyisocyanate composition, or a combination thereof.

The average isocyanate functionality of the polyether-modified polyisocyanate composition is calculated according to the following formula: <MAT>.

The polyisocyanate having an isocyanate group functionality of <NUM>-<NUM> has an isocyanate group functionality of preferably <NUM>-<NUM>, most preferably <NUM>-<NUM>.

The polyisocyanate having an isocyanate group functionality of <NUM>-<NUM> has in solvent-free form a viscosity of preferably 500mPa•s-1500mPa•s.

The polyisocyanate having an isocyanate group functionality of <NUM>-<NUM> has an isocyanate group content of preferably <NUM> wt. %-<NUM> wt. %, most preferably <NUM> wt. %-<NUM> wt. %, relative to the total weight of the component a) polyisocyanate having an isocyanate group functionality of <NUM>-<NUM>.

The polyisocyanate having an isocyanate group functionality of <NUM>-<NUM> contains one or more of the following: hexamethylene diisocyanate trimer and pentamethylene diisocyanate trimer. The amount of hexamethylene diisocyanate trimer, pentamethylene diisocyanate trimer or a combination thereof is at least <NUM> wt. %, preferably at least <NUM> wt. %, further preferably at least <NUM> wt. %, most preferably at least <NUM> wt. %, relative to the total weight of the polyisocyanate having an isocyanate group functionality of <NUM>-<NUM>.

Preferably, the component a) polyisocyanate having an isocyanate group functionality of <NUM>-<NUM> further contains an additional isocyanate.

The amount of the additional isocyanate is preferably not more than <NUM> wt. %, further preferably not more than <NUM> wt. %, more preferably not more than <NUM> wt. %, most preferably not more than <NUM> wt. %, relative to the total weight of the component a) polyisocyanate having an isocyanate group functionality of <NUM>-<NUM>.

The additional isocyanate is preferably one or more of the following: aliphatic polyisocyanate and cycloaliphatic polyisocyanate, further preferably aliphatic polyisocyanate, furthermore preferably one or more of the following: aliphatic isocyanate uretdione and aliphatic isocyanate biuret, more preferably one or more of the following: hexamethylene diisocyanate uretdione and pentamethylene diisocyanate uretdione, most preferably hexamethylene diisocyanate uretdione.

The aliphatic polyisocyanate and the cycloaliphatic polyisocyanate each independently preferably have one or more of the following structures: iminooxadiazinedione, isocyanurate, uretdione, allophanate and biuret. The aliphatic polyisocyanate and the cycloaliphatic polyisocyanate are each independently prepared by simple modification of diisocyanate and synthesized from at least two diisocyanates, for example, as described in <CIT>, <CIT>, <CIT>, <CIT> and <CIT>. The diisocyanate is preferably a diisocyanate having a number average molecular weight of <NUM>/mol-<NUM>/mol and containing aliphatically and/or cycloaliphatically bonded isocyanate group(s), and is preferably one or more of the following: <NUM>,<NUM>-diisocyanatobutane, <NUM>,<NUM>-diisocyanatohexane (HDI), <NUM>,<NUM>-diisocyanatopentane (PDI), <NUM>,<NUM>-diisocyanato-<NUM>,<NUM>-dimethylpentane, <NUM>,<NUM>,<NUM>- and <NUM>,<NUM>,<NUM>-trimethyl-<NUM>,<NUM>-diisocyanatohexanes, <NUM>,<NUM>-diisocyanatodecane, <NUM>-Isocyanato-<NUM>,<NUM>,<NUM>-trimethyl-<NUM>-isocyanatomethylcyclohexane (isophorone diisocyanate, IPDI), <NUM>,<NUM>-and <NUM>,<NUM>-diisocyanatocyclohexanes, <NUM>,<NUM>'-diisocyanatodicyclohexylmethane and a mixture of these diisocyanates and is more preferably one or more of the following: <NUM>,<NUM>-diisocyanatobutane, <NUM>,<NUM>-diisocyanatohexane (HDI), <NUM>,<NUM>-diisocyanatopentane (PDI), <NUM>,<NUM>-diisocyanato-<NUM>,<NUM>-dimethylpentane, <NUM>,<NUM>,<NUM>-and <NUM>,<NUM>,<NUM>-trimethyl-<NUM>,<NUM>-diisocyanatohexanes, <NUM>,<NUM>-diisocyanatodecane, <NUM>,<NUM>-and <NUM>,<NUM>-diisocyanatocyclohexanes, <NUM>,<NUM>'-diisocyanatodicyclohexylmethane and a mixture of these diisocyanates.

The amount of the hexamethylene diisocyanate uretdione is preferably not more than <NUM> wt. %, further preferably not more than <NUM> wt. %, more preferably not more than <NUM> wt. %, most preferably not more than <NUM> wt. %, relative to the total weight of the component a) polyisocyanate having an isocyanate group functionality of <NUM>-<NUM>.

When the system contains two or more polyisocyanates, the isocyanate group functionality of the polyisocyanate refers to the average isocyanate group functionality of the two or more polyisocyanates.

The amount of the polyisocyanate having an isocyanate group functionality of <NUM>-<NUM> is preferably greater than <NUM> wt. %, most preferably greater than <NUM> wt. %, relative to the total weight of the system.

The component b) polyoxyalkylene monoether alcohol has a number-average molecular weight of preferably <NUM>/mol-<NUM>/mol, further preferably <NUM>/mol-<NUM>/mol, most preferably <NUM>/mol-<NUM>/mol.

The oxypropylene group content of the component b) polyoxyalkylene monoether alcohol is preferably <NUM> wt. %-<NUM> wt. %, further preferably <NUM> wt. %-<NUM> wt. %, most preferably <NUM> wt. %-<NUM> wt. %, relative to the total weight of the oxyalkylene group of the polyoxyalkylene monoether alcohol.

The component b) polyoxyalkylene monoether alcohol is preferably a polypropylene glycol monomethylether averagely containing <NUM>-<NUM> propylene oxide units, further preferably a polypropylene glycol monomethylether averagely containing <NUM>-<NUM> propylene oxide units, most preferably a polypropylene glycol monomethylether averagely containing <NUM>-<NUM> propylene oxide units.

The polyoxyalkylene monoether alcohol may be obtained by a known method, and the preferred starting components contain at least one of a monohydric alcohol and a secondary monoamine, and an oxyalkylene compound, the monohydric alcohol and the secondary monoamine being present either or both.

The monohydric alcohol is preferably a monohydric alcohol having a molecular weight of <NUM>/mol-<NUM>/mol, for example the monohydric alcohol used according to EPA-<NUM>, most preferably one or more of the following: methanol and butanol.

The secondary monoamine is preferably one or more of the following: dimethylamine and diethylamine.

The oxyalkylene compound preferably contains <NUM> wt. %-<NUM> wt. %, further preferably <NUM> wt. %-<NUM> wt. %, more preferably <NUM> wt. %-<NUM> wt. %, most preferably <NUM> wt. %-<NUM> wt. % of propylene oxide, relative to the total weight of the oxyalkylene compound.

The oxyalkylene compound may further comprise ethylene oxide, preferably in an amount of not more than <NUM> wt. %, further preferably not more than <NUM> wt. %, most preferably not more than <NUM> wt. %, relative to the total weight of the oxyalkylene compound.

The starting components are preferably reacted at <NUM>-<NUM>, most preferably at <NUM>-<NUM>.

The equivalent ratio NCO/OH of the starting components is preferably <NUM>:<NUM>-<NUM>:<NUM>, most preferably <NUM>:<NUM>-<NUM>:<NUM>. The starting components are preferably reacted further until the theoretically calculated isocyanate content is reached.

The hydroxyl value of the component b) polyoxyalkylene monoether alcohol is preferably 40mgKOH/g-61mgKOH/g.

When the system contains two or more polyoxyalkylene monoether alcohols, the number-average molecular weight of the polyoxyalkylene monoether alcohol refers to the average number-average molecular weight of two or more polyoxyalkylene monoether alcohols; the oxypropylene group content of the polyoxyalkylene monoether alcohol refers to the average oxypropylene group content of two or more polyoxyalkylene monoether alcohols, i.e., the average value of the oxypropylene group contents of two or more polyoxyalkylene monoether alcohols.

The number-average molecular weight of the polyoxyalkylene monoether alcohol is preferably be determined according to GBT <NUM>-<NUM> at <NUM> with the gel permeation chromatography by using tetrahydrofuran as the mobile phase and polyethylene glycol as the standard sample.

The calculation method of the oxypropylene group content of the polyoxyalkylene monoether alcohol is as follows: <MAT> wherein:.

When the system contains two or more polyoxyalkylene monoether alcohols, the system preferably contains at least one polyoxyalkylene monoether alcohol having a number-average molecular weight of preferably <NUM>/mol-<NUM>/mol, further preferably <NUM>/mol-<NUM>/mol, more preferably <NUM>/mol-<NUM>/mol, most preferably <NUM>/mol-<NUM>/mol; and an oxypropylene group content of preferably <NUM> wt. %-<NUM> wt. %, further preferably <NUM> wt. %-<NUM> wt. %, most preferably <NUM> wt. %-<NUM> wt. %, relative to the total weight of the oxyalkylene group of the polyoxyalkylene monoether alcohol.

The amount of the component b) polyoxyalkylene monoether alcohol is preferably greater than <NUM> wt. % and less than <NUM> wt. %, further preferably <NUM> wt. %-<NUM> wt. %, furthermore preferably <NUM> wt. %-<NUM> wt. %, more preferably <NUM> wt. %-<NUM> wt. %, most preferably <NUM> wt. %-<NUM> wt. %, relative to the total weight of the system.

The component c) catalyst is preferably one or more of the following: sulfonic acid catalysts, phosphoric acid catalysts, tertiary amine catalysts, tertiary phosphine catalysts, tertiary hydroxyalkyl amine catalysts and metal catalysts, most preferably one or more of the following: metal catalysts and phosphoric acid catalysts.

The sulfonic acid catalyst is preferably one or more of the following: methane sulfonic acid, paratoluenesulfonic acid, trifluoromethanesulfonic acid, perfluorobutanesulfonic acid, dodecylbenzene sulfonic acid, methyl-and ethyl-toluenesulfonic acid salts.

The phosphoric acid catalyst is preferably one or more of the following: silylated acid, monoalkyl phosphate and dialkyl phosphate, further preferably one or more of the following: monobutyl phosphate, monotridecyl phosphate, dibutyl phosphate, dioctyl phosphate, trimethylsilyl methanesulfonate, trimethylsilyl trifluoromethanesulfonate, tris(trimethylsilyl) phosphate and diethyl trimethylsilyl phosphate, most preferably one or more of the following: monobutyl phosphate and dibutyl phosphate.

The tertiary amine catalyst is preferably one or more of the following: triethylamine, tributylamine, N,N-dimethylaniline, N-ethylpiperidine and N,N'-dimethylpiperazine.

The tertiary phosphine catalyst is preferably one or more of the following: triethylphosphine, tributylphosphine and dimethylphenylphosphine.

The tertiary hydroxyalkylamine catalyst is preferably those described in <CIT> and/or <CIT>, most preferably one or more of the following: triethanolamine, N-methyldiethanolamine, dimethylethanolamine, a mixture of a tertiary bicycloamine (e.g., DBU) with a low molecular weight simple aliphatic alcohol, N-isopropyldiethanolamine, and <NUM>-(<NUM>-hydroxyethyl)pyrrolidine.

The metal catalyst may be those described in DEA3240613, preferably one or more of the following: caprylate salts of manganese, caprylate salts of iron, caprylate salts of cobalt, caprylate salts of nickel, caprylate salts of copper, caprylate salts of zinc, caprylate salts of zirconium, caprylate salts of cerium, caprylate salts of lead, naphthenate salts of manganese, naphthenate salts of iron, naphthenate salts of cobalt, naphthenate salts of nickel, naphthenate salts of copper, naphthenate salts of zinc, naphthenate salts of zirconium, naphthenate salts of cerium, naphthenate salts of lead, and mixtures of the above-mentioned salts with acetate salt(s) of lithium, sodium, potassium, calcium or barium. The metal catalyst may also be those described in DEA3219608, preferably one or more of the following: sodium salts of straight or branched alkane carboxylic acids having up to <NUM> carbon atoms and potassium salts of straight or branched alkane carboxylic acids having up to <NUM> carbon atoms, wherein the carboxylic acid is preferably one or more of the following: propionic acid, butyric acid, valeric acid, hexanoic acid, heptylic acid, octanoic acid, nonylic acid, decanoic acid and undecanoic acid. The metal catalyst may also be an alkali metal salt and/or an alkaline earth metal salt as described in EPA0100129, preferably one or more of the following: said salts of aliphatic, cycloaliphatic or aromatic mono- and polycarboxylic acids having <NUM>-<NUM> carbon atoms, e.g. sodium benzoate or potassium benzoate. The metal catalyst may also be an alkali metal phenolate known from <CIT> and <CIT>, preferably one or more of the following: a sodium phenolate and a potassium phenolate. The metal catalyst may also be those known from <CIT>, preferably one or more of the following: an alkali metal oxide, an alkaline earth metal oxide, an alkali metal hydroxide, an alkaline earth metal hydroxide, an alkali metal carbonate, an alkaline earth metal carbonate, an alkali metal alkoxide, an alkaline earth metal alkoxide, an alkali metal phenolate, an alkaline earth metal phenolate, an alkali metal salt of an alkylenable compound, a metal salt of a weak aliphatic carboxylic acid, a metal salt of a cycloaliphatic carboxylic acid, a basic alkali metal compound complexed with a crown ether and a basic alkali metal compound complexed with a polyether alcohol. The metal catalyst may also be a pyrrolidone potassium salt known from <CIT>. The metal catalyst may also be a mono- or polycyclic complex of titanium, zirconium and/or hafnium as known from <CIT>, preferably one or more of the following: zirconium tetra-n-butyrate, zirconium tetra-<NUM>-ethylhexanoate, and zirconium tetra-(<NUM>-ethylhexoxide). The metal catalyst may also be a tin compound of the type as described in <NPL>, and is preferably one or more of the following: dibutyltin dichloride, diphenyltin dichloride, triphenylstannanol, tributyltin acetate, tributyltin oxide, tin octoate, dibutyl(dimethoxy)stannane, and imidazole tributyltin.

The metal salt of the weak aliphatic carboxylic acid and the metal salt of the cycloaliphatic carboxylic acid are each independently preferably one or more of the following: sodium methoxide, sodium acetate, potassium acetate, sodium acetoacetate, lead <NUM>-ethylhexanoate, and lead naphthenate.

The basic alkali metal compound complexed with the crown ether and the basic alkali metal compound complexed with the polyether alcohol are each independently preferably one or more of the following: the complexes of sodium or potassium carboxylates, which are known from EPA0056158 and EPA0056159.

When the system contains a metal catalyst, a terminator is required after the reaction of the system is finished. Further, the above-mentioned phosphoric acid catalyst, sulfonic acid catalyst and their derivatives may be used herein as a terminator. In addition to these two acid catalysts, other inorganic acids such as hydrochloric acid, phosphorous acid, acid chlorides such as acetyl chloride, benzoyl chloride or isophthaloyl dichloride can also be used as terminator.

The amount of the catalyst is <NUM>-<NUM> wt. %, relative to the total weight of the system.

The system may further comprise a solvent, which is inert towards isocyanate groups.

The solvent may be known, and preferably one or more of the following: ethyl acetate, butyl acetate, ethylene glycol monomethyl, ethylether acetic acid ester, <NUM>-acetic acid <NUM>-methoxypropyl-<NUM>-acetic acid ester, <NUM>-butanone, <NUM>-methyl-<NUM>-pentanone, cyclohexanone, toluene, propylene-glycol diacetate, diethylene glycol dimethyl ether, diethylene glycol ethyl ester, butylether acetic acid ester, N-methylpyrrolidone and N-methylcaprolactam.

The amount of the solvent is <NUM>-<NUM> wt. %, relative to the total weight of the system.

Preferably, the component b) polyoxyalkylene monoether alcohol is bonded to the component a) polyisocyanate via a urethane group.

It is possible in the system that excessive component a) polyisocyanate having an isocyanate group functionality of <NUM>-<NUM> is present in the polyether-modified polyisocyanate composition.

The polyether-modified polyisocyanate composition, when being used, may be mixed with an isocyanate other than the polyether-modified polyisocyanate composition of the present invention, for example, may be mixed with an unmodified isocyanate.

The polyether-modified polyisocyanate composition can be used as a starting component for the production of polyurethanes by the isocyanate polyaddition process.

The polyether-modified polyisocyanate compositions can also be used as the crosslinking component in the solvent-borne or solvent-free two-component coating.

The molar ratio of isocyanate groups of the polyether-modified polyisocyanate composition to isocyanate-reactive groups of the compound containing an isocyanate-reactive group in the two-component coating composition is preferably <NUM>: <NUM>.

The isocyanate-reactive group is preferably one or more of the following: hydroxyl, thiol and amino, further preferably one or more of the following: secondary hydroxyl and amino, most preferably secondary amino.

The compound containing an isocyanate-reactive group preferably contains at least one compound corresponding to formula I:
<CHM>.

The compound containing an isocyanate-reactive group is prepared in a known manner by reacting a primary polyamine corresponding to formula II:
<CHM>
with an optionally substituted maleate and/or an optionally substituted fumarate corresponding to formula III:.

R1COO-CR<NUM>=CR<NUM>-COOR<NUM>     III.

The primary polyamine corresponding to formula II is preferably one or more of the following: ethylene diamine, <NUM>,<NUM>-diaminopropane, <NUM>,<NUM>-diaminobutane, <NUM>,<NUM>-diaminopentane, <NUM>,<NUM>-diaminohexane, <NUM>,<NUM>-diamino-<NUM>,<NUM>-dimethylhexane, <NUM>,<NUM>,<NUM>-trimethyl-<NUM>,<NUM>-diaminohexane, <NUM>,<NUM>,<NUM>-trimethyl-<NUM>,<NUM>-diaminohexane, <NUM>,<NUM>-diaminoundecane, <NUM>,<NUM>-diaminododecane, <NUM>,<NUM>-cyclohexane diamine, <NUM>,<NUM>-cyclohexane diamine, <NUM>-amino-<NUM>,<NUM>,<NUM>-trimethyl-<NUM>-aminomethyl-cyclohexane, <NUM>,<NUM>-hexahydrotoluylenediamine, <NUM>,<NUM>-hexahydrotoluylenediamine, <NUM>,<NUM>'-diaminodicyclohexylmethane, <NUM>,<NUM>'-diaminodicyclohexylmethane and <NUM>,<NUM>'-dialkyl-<NUM>,<NUM>'-diamino-dicyclohexylmethane (for example <NUM>,<NUM>'-dimethyl-<NUM>,<NUM>'-diamino-dicyclohexylmethane and <NUM>,<NUM>'-diethyl-<NUM>,<NUM>'-diaminodicyclohexylmethane), most preferably one or more of the following: <NUM>,<NUM>-diaminobutane, <NUM>,<NUM>-diaminohexane, <NUM>,<NUM>,<NUM>-trimethyl-<NUM>,<NUM>-diaminohexane, <NUM>,<NUM>,<NUM>-trimethyl-<NUM>,<NUM>-diaminohexane, <NUM>,<NUM>-cyclohexane diamine, <NUM>,<NUM>-cyclohexane diamine, <NUM>-amino-<NUM>,<NUM>,<NUM>-trimethyl-<NUM>-aminomethylcyclohexane, <NUM>,<NUM>-hexahydrotoluylenediamine, <NUM>,<NUM>-hexahydrotoluylenediamine, <NUM>,<NUM>'-diamino-dicyclohexylmethane, <NUM>,<NUM>'-dimethyl-<NUM>,<NUM>'-diaminodicyclohexylmethane and <NUM>,<NUM>'-diethyl-<NUM>,<NUM>'-diamino-dicyclohexylmethane.

The primary polyamine can also be aromatic polyamine, for example one or more of the following: <NUM>,<NUM>-diaminotoluene, <NUM>,<NUM>-diaminotoluene, <NUM>,<NUM>'-diaminodiphenylmethane and <NUM>,<NUM>'-diaminodiphenylmethane. Also suitable are relatively high molecular weight polyether polyamines containing an aliphatically bonded primary amino group, such as the product sold under the Jeffamine trademark by Texaco.

The compounds suitable for the preparation of the optionally substituted maleate and/or the optionally substituted fumarate corresponding to formula III are each independently preferably one or more of the following: dimethyl maleate, dimethyl fumarate, diethyl maleate, diethyl fumarate, di-n-butyl maleate, di-n-butyl fumarate and the corresponding maleates or fumarates substituted by methyl.

The compound containing an isocyanate-reactive group is most preferably an aspartic ester. For example, it is obtained by reacting the primary polyamine corresponding to formula II with the optionally substituted maleate and/or an optionally substituted fumarate corresponding to formula III in a proportion of at least <NUM>:<NUM> at a temperature of <NUM>-<NUM>. After the reaction, the excessive raw material can be removed by distillation. The reaction can be carried out without solvent or in the presence of suitable solvents such as methanol, ethanol, propanol, dioxane and a mixture of these solvents.

A-component and B-component of the solvent-borne or solvent-free two-component coating composition are preferably stored separately, and these two components are mixed before use to give the two-component system.

The two-component coating composition preferably further contains one or more of the following: auxiliary and additive.

Said application/coating can be carried out by using mechanical tools known to those skilled in the art or using a two-component spray gun.

The substrate is preferably one or more of the following: artificial stone, wood, artificial wood, marble, terrazzo, ceramic, linoleum, metal, mineral material, plastic, rubber, concrete, composite sheet, paper, leather and glass. The substrate may be pretreated. The pretreatment is preferably polishing and/or coating.

The coating is preferably used to protect floors, walls, surfaces of reinforced concrete or metal containers or other surfaces that need the protection.

Unless defined otherwise, all technical and scientific terms used herein have the same meanings as commonly understood by those skilled in the art to which this invention belongs. To the extent that the definitions of terms used in this specification conflict with meanings commonly understood by those skilled in the art to which this invention belongs, the definitions set forth herein prevail.

As used in this specification, unless otherwise indicated, "a", "an", and "the/said" are intended to comprise "at least one" or "one or more". For example, "a component" refers to one or more components, and thus more than one component may be considered and may be employed or used in the practice of the described embodiments.

The expression "and/or" as used herein means one or all of the mentioned elements.

All percentages in the present invention are by weight unless otherwise stated.

The analysis and measurement of the present invention are carried out at <NUM>±<NUM> and <NUM>±<NUM>% relative humidity, unless otherwise stated.

The isocyanate group (NCO) content is measured according to DIN-EN ISO <NUM>:<NUM>-<NUM>.

The number-average molecular weight of the isocyanate is determined at <NUM> according to DIN <NUM>-<NUM>:<NUM>-<NUM> with gel permeation chromatography by using tetrahydrofuran as the mobile phase and using polystyrene as standard.

The number-average molecular weight of the polyoxyalkylene monoether alcohol is determined according to GBT <NUM>-<NUM> at <NUM> with the gel permeation chromatography by using tetrahydrofuran as the mobile phase and polyethylene glycol as the standard sample.

The non-volatile component is determined according to DIN EN ISO <NUM>:<NUM>-<NUM>, wherein the measurement conditions comprise the drying temperature of <NUM>, the drying time of <NUM> hours, the test disc diameter of <NUM> and the test amount of <NUM>±<NUM>, and the results are expressed in wt.

The viscosity is determined according to DIN EN ISO <NUM>: <NUM>-<NUM> at <NUM> under a shear rate of <NUM>-<NUM>, with the MV-DIN rotor being chosen.

The amino group content is determined according to AFAM <NUM>-<NUM>.

The hydroxyl value is determined according to ASTM D4274.

The color value is determined according to DIN-EN1557:<NUM>-<NUM>.

Bubble-free film thickness (BFFT): Coating layers with different thicknesses are prepared on glasses by means of a film thickness adjustable film scraper (the film thickness being set to <NUM>, <NUM> and <NUM>) (the test method of the coating thickness: the cured coating layer is peeled from the glass and measured with a film thickness measurement instrument); the application area is about <NUM>* <NUM>; after the coating layer is cured for one day, if the surface of the coating layer is observed with naked eyes to have no bubbles, the bubble-free film thickness is considered to be more than or equal to the thickness of the coating layer. The desirable bubble-free film thickness is <NUM> or more.

Surface-drying time: a coating layer is prepared on a glass by means of a film scraper (the film thickness being set to <NUM>); and the measurement is carried out according to GB/T13477. <NUM>-<NUM> by touching the surface of the coating layer with a finger and determining the surface being dried if feeling tacky but without the coating sticking to the finger; the time period taken from the application of the coating to the glass surface until the surface of the coating layer being dried is considered as the surface-drying time. The desirable surface-drying time is less than <NUM>.

Pendulum hardness: a coating layer is prepared on a glass by means of a film scraper (the film thickness being set to <NUM>), and the hardness of the coating layer is determined by using a BYK Pendulum hardness tester. The Pendulum hardness (1d) refers to the Pendulum hardness after the coating layer is stored for one day, and the Pendulum hardness (7d) refers to the Pendulum hardness after the coating layer is stored for seven days. The desirable Pendulum hardness (7d) is greater than <NUM>.

Working time: the viscosity at which the mixing of the components of the coating is completed and no additional components are added is the initial viscosity, and the time it takes for the viscosity of the coating to reach twice the initial viscosity is the working time. The longer the working time is, the longer the operable time of the coating is. The desirable working time is <NUM> minutes or more.

Hexamethylene diisocyanate trimer <NUM>: <NUM> of hexamethylene diisocyanate (HDI) was charged into a four-necked flask equipped with a stirrer, a thermometer, a reflux condenser, a nitrogen gas blowing tube and a dropping funnel under a nitrogen atmosphere, and heated to <NUM> with stirring, and <NUM> of trimethyl-<NUM>-methyl-<NUM>-hydroxyethylammonium hydroxide (a solution diluted to <NUM> wt. % with isobutanol) was then added, and when the NCO of the reaction solution was <NUM> wt. %, <NUM> of din-butyl phosphate was added to terminate the reaction. Unreacted monomers were removed at <NUM> and <NUM>. 05mbar by means of a thin-film evaporator to give a hexamethylene diisocyanate trimer <NUM> having a non-volatile content of <NUM> wt. %, a viscosity of <NUM> mPa·s (<NUM>), an NCO content of <NUM> wt. %, an HDI monomer concentration of <NUM> wt. % and a NCO functionality of <NUM>.

Hexamethylene diisocyanate trimer <NUM>: The procedure for preparing the hexamethylene diisocyanate trimer <NUM> was used, except that, a tetrabutylphosphonium fluoride solution (diluted to <NUM>% with a solvent of isopropanol/methanol having a weight ratio of <NUM>:<NUM>) was used as the catalyst, and when the NCO in the reaction solution reached <NUM>%, dibutyl phosphate was added to terminate the reaction to give a hexamethylene diisocyanate trimer <NUM> having a non-volatile content of <NUM> wt. %, a viscosity of <NUM> mPa·s (<NUM>), a NCO content of <NUM> wt. %, a HDI monomer concentration of <NUM> wt. % and a NCO functionality of <NUM>.

Hexamethylene diisocyanate uretdione <NUM>: To <NUM> (<NUM> mol) of hexamethylene diisocyanate (HDI) were successively added under dry nitrogen at room temperature, <NUM> (<NUM>%) of N,N-diethylurea as stabilizer, <NUM> (<NUM>%) of <NUM>,<NUM>-butanediol as cocatalyst and <NUM> (<NUM>%/<NUM> mol) of tri-n-butylphosphine as catalyst, and the mixture was heated to <NUM>. After a reaction time of <NUM> hours, the NCO content of the reaction mixture was <NUM>%, corresponding to an oligomerization degree of <NUM>%. <NUM> (<NUM> mol) of methyl p-toluene sulfonate was added to terminate the reaction, and the mixture was heated for <NUM> hour to <NUM>. The thin-layer distillation was carried out at a temperature of <NUM>. Then at <NUM> and under a pressure of <NUM> mbar, a colorless polyisocyanate containing uretdione groups was obtained, which had an NCO content of <NUM>%, a monomeric HDI content of <NUM>%, a viscosity of <NUM> mPa s (<NUM>) and a NCO functionality of <NUM>.

Desmophen NH <NUM>: an aspartate having an amino group equivalent of <NUM>, and a viscosity of <NUM> mPa·s (<NUM>), commercially available from Covestro AG, Germany.

T01-A: a polyoxyalkylene monoether alcohol having an oxypropylene group accounting for <NUM> wt. % of the oxyalkylene group of the polyoxyalkylene monoether alcohol, a number-average molecular weight of <NUM>/mol, and an OH-value of <NUM>. 6mgKOH/g with the starting components being propylene oxide and n-butanol.

TP-<NUM>: a polyoxyalkylene monoether alcohol having an oxypropylene group accounting for <NUM> wt. % of the oxyalkylene group of the polyoxyalkylene monoether alcohol, a number-average molecular weight of <NUM>/mol, and an OH-value of 55mgKOH/g with the starting components being propylene oxide and n-butanol.

TD-<NUM>: a polyoxyalkylene monoether alcohol having an oxypropylene group accounting for <NUM> wt. % of the oxyalkylene group of the polyoxyalkylene monoether alcohol, a number-average molecular weight of <NUM>/mol, and an OH-value of <NUM>. 65mgKOH/g with the starting components being propylene oxide and n-butanol.

LB25: polyoxyalkylene monoether alcohol, having an oxyethylene group accounting for <NUM> wt. % of the oxyalkylene group of the polyoxyalkylene monoether alcohol, a number-average molecular weight of <NUM>/mol, an OH value of 25mgKOH/g, with the starting components being ethylene oxide, propylene oxide and diethylene glycol butyl ether, the weight ratio of ethylene oxide to propylene oxide being <NUM>: <NUM>.

MPEG <NUM>: a polyoxyalkylene monoether alcohol, having a number-average molecular weight of <NUM>/mol, an OH-value of 56mgKOH/g with the starting components being ethylene oxide and methanol.

Tetrabutylphosphonium fluoride solution: commercially available from Jin Jin Le Chemical Company.

DABCO NE310: a tertiary amine catalyst having a viscosity <NUM> mPa·s (<NUM>), commercially available from Air Chemistry.

Dibutyl phosphate: commercially available from Sigma-Aldrich Shanghai Trade Co.

DBTL12 : commercially available from Sigma-Aldrich Shanghai Trade Co.

<NUM> (<NUM>. 6571eq) of hexamethylene diisocyanate trimer <NUM> and <NUM> ( <NUM>. 00019mol) of dibutyl phosphate were added to a <NUM> flask with a dropping funnel and a nitrogen inlet and stirred to obtain a solution. The resulting solution was heated to <NUM>. <NUM> ( <NUM>. 0298eq) of TP-<NUM> was added dropwise to the flask over <NUM> minutes to react until the isocyanate group (NCO) content reached <NUM>%, and the heating was terminated to obtain a polyether-modified polyisocyanate composition <NUM>, which was a colorless transparent solution and which satisfied the following characteristic data:.

<NUM> (<NUM>. 5476eq) of hexamethylene diisocyanate trimer <NUM> and <NUM> (<NUM>. 00014mol) of dibutyl phosphate were added to a <NUM> flask with a dropping funnel and a nitrogen inlet and stirred to obtain a solution. The resulting solution was heated to <NUM>. <NUM> (<NUM>. 0331eq) of TP-<NUM> was added dropwise to the flask over <NUM> minutes to react until the isocyanate group (NCO) content reached <NUM>%, and the heating was terminated to obtain a polyether-modified polyisocyanate composition <NUM>, which was a colorless transparent solution and which satisfied the following characteristic data:.

<NUM> (<NUM>. 3143eq) of hexamethylene diisocyanate trimer <NUM> and <NUM> (<NUM>. 00024mol) of dibutyl phosphate were added to a <NUM> flask with a dropping funnel and a nitrogen inlet and stirred to obtain a solution. The resulting solution was heated to <NUM>. <NUM> (<NUM>. 1012eq) of TP-<NUM> was added dropwise to the flask over <NUM> minutes to react until the isocyanate group (NCO) content reached <NUM>%, and the heating was terminated to obtain a polyether-modified polyisocyanate composition <NUM>, which was a colorless transparent solution and which satisfied the following characteristic data:.

Wherein, the amount of TP-<NUM> comprised <NUM> wt. % of the system.

<NUM> (<NUM>. 3143eq) of hexamethylene diisocyanate trimer <NUM> was added to a <NUM> flask with a dropping funnel and a nitrogen inlet and stirred to obtain a solution. The resulting solution was heated to <NUM>. <NUM> (<NUM>. 1283eq) of TP-<NUM> was added dropwise to the flask over <NUM> minutes to react until the isocyanate group (NCO) content reached <NUM>%, and the heating was terminated to obtain a polyether-modified polyisocyanate composition <NUM>, which was a colorless transparent solution and which satisfied the following characteristic data:.

<NUM> (<NUM>. 3143eq) of hexamethylene diisocyanate trimer <NUM> was added to a <NUM> flask with a dropping funnel and a nitrogen inlet and stirred to obtain a solution. The resulting solution was heated to <NUM>. <NUM> (<NUM>. 1588eq) of TP-<NUM> was added dropwise to the flask over <NUM> minutes to react until the isocyanate group (NCO) content reached <NUM>%, and the heating was terminated to obtain a polyether-modified polyisocyanate composition <NUM>, which was a colorless transparent solution and which satisfied the following characteristic data:.

<NUM> (<NUM>. 6766eq) of hexamethylene diisocyanate trimer <NUM> and <NUM> (<NUM>. 00017mol) of dibutyl phosphate were added to a <NUM> flask with a dropping funnel and a nitrogen inlet and stirred to obtain a solution. The resulting solution was heated to <NUM>. A mixture of <NUM> (<NUM>. 0364eq) of T01-A and <NUM> (<NUM>. 0165eq) of TP-<NUM> was added dropwise to the flask over <NUM> minutes to react until the isocyanate group (NCO) content reached <NUM>%, and the heating was terminated to obtain a polyether-modified polyisocyanate composition <NUM>, which was a colorless transparent solution and which satisfied the following characteristic data:.

Wherein, the average number-average molecular weight of T01-A and TP-<NUM> was <NUM>/mol, and the total amount by weight of T01-A and TP-<NUM> comprised <NUM> wt. % of the system.

<NUM> (<NUM>. 8857eq) of hexamethylene diisocyanate trimer <NUM> and <NUM> (<NUM>. 000032mol) of dibutyl phosphate were added to a <NUM> flask with a dropping funnel and a nitrogen inlet and stirred to obtain a solution. The resulting solution was heated to <NUM>. A mixture of <NUM> (<NUM>. 0523eq) of TP-<NUM> and <NUM> (<NUM>. 0072eq) of LB25 was added dropwise to the flask over <NUM> minutes to react until the isocyanate group (NCO) content reached <NUM>%, and the heating was terminated to obtain a polyether-modified polyisocyanate composition <NUM>, which was a colorless transparent solution and which satisfied the following characteristic data:.

<NUM> (<NUM>. 8858eq) of hexamethylene diisocyanate trimer <NUM> and <NUM> (<NUM>. 000033mol) of dibutyl phosphate were added to a <NUM> flask with a dropping funnel and a nitrogen inlet and stirred to obtain a solution. The resulting solution was heated to <NUM>. A mixture of <NUM> (<NUM>. 0274eq) of TP-<NUM> and <NUM> (<NUM>. 0183eq) of LB25 was added dropwise to the flask over <NUM> minutes to react until the isocyanate group (NCO) content reached <NUM>%, and the heating was terminated to obtain a polyether-modified polyisocyanate composition <NUM>, which was a colorless transparent solution and which satisfied the following characteristic data:.

<NUM> (<NUM>. 8857eq) of hexamethylene diisocyanate trimer <NUM> and <NUM> (<NUM>. 000032mol) of dibutyl phosphate were added to a <NUM> flask with a dropping funnel and a nitrogen inlet and stirred to obtain a solution. The resulting solution was heated to <NUM>. A mixture of <NUM> (<NUM>. 0427eq) of T01-A and <NUM> (<NUM>. 0147eq) of LB25 was added dropwise to the flask over <NUM> minutes to react until the isocyanate group (NCO) content reached <NUM>%, and the heating was terminated to obtain a polyether-modified polyisocyanate composition <NUM>, which was a colorless transparent solution and which satisfied the following characteristic data:.

Wherein, the average number-average molecular weight of T01-A and LB <NUM> was <NUM>/mol, and the total amount by weight of T01-A and LB <NUM> comprised <NUM> wt. % of the system, the average of the oxypropylene group content of T01-A and the oxypropylene group content of LB <NUM> was <NUM> wt.

<NUM> (<NUM>. 8857eq) of hexamethylene diisocyanate trimer <NUM> and <NUM> (<NUM>. 000032mol) of dibutyl phosphate were added to a <NUM> flask with a dropping funnel and a nitrogen inlet and stirred to obtain a solution. The resulting solution was heated to <NUM>. A mixture of <NUM> (<NUM>. 0455eq) of TP-<NUM> and <NUM> (<NUM>. 0103eq) of LB25 was added dropwise to the flask over <NUM> minutes to react until the isocyanate group (NCO) content reached <NUM>%, and the heating was terminated to obtain a polyether-modified polyisocyanate composition <NUM>, which was a colorless transparent solution and which satisfied the following characteristic data:.

Wherein, the average number-average molecular weight of TP-<NUM> and LB <NUM> was <NUM>/mol, and the total amount by weight of TP-<NUM> and LB <NUM> comprised <NUM> wt. % of the system, the average of the oxypropylene group content of TP-<NUM> and the oxypropylene group content of LB25 was <NUM> wt.

<NUM> (<NUM>. 3887eq) of hexamethylene diisocyanate trimer <NUM>, <NUM> (<NUM>. 1815eq) of hexamethylene diisocyanate uretdione <NUM> and <NUM> of DBTL12 were added to a <NUM> flask with a dropping funnel and a nitrogen inlet and stirred to obtain a solution. The resulting solution was heated to <NUM>. <NUM> (<NUM>. 0455eq) of TP-<NUM> was added dropwise to the flask over <NUM> minutes to react until the isocyanate group (NCO) content reached <NUM>%, and the heating was terminated to obtain a polyether-modified polyisocyanate composition <NUM>, which was a colorless transparent solution and which satisfied the following characteristic data:.

<NUM> (<NUM>. 7490eq) of hexamethylene diisocyanate trimer <NUM>, <NUM> (<NUM>. 5445eq) of hexamethylene diisocyanate uretdione <NUM> and <NUM> of DBTL12 were added to a <NUM> flask with a dropping funnel and a nitrogen inlet and stirred to obtain a solution. The resulting solution was heated to <NUM>. <NUM> (<NUM>. 1822eq) of TP-<NUM> was added dropwise to the flask over <NUM> minutes to react until the isocyanate group (NCO) content reached <NUM>%, and the heating was terminated to obtain a polyether-modified polyisocyanate composition <NUM>, which was a colorless transparent solution and which satisfied the following characteristic data:.

<NUM> (<NUM>. 8305eq) of hexamethylene diisocyanate trimer <NUM> and <NUM> (<NUM>. 000026mol) of dibutyl phosphate were added to a <NUM> flask with a dropping funnel and a nitrogen inlet and stirred to obtain a solution. The resulting solution was heated to <NUM>. <NUM> (<NUM>. 0178eq) of TP-<NUM> was added dropwise to the flask over <NUM> minutes to react until the isocyanate group (NCO) content reached <NUM>%, and the heating was terminated to obtain a comparative polyether-modified polyisocyanate composition <NUM>, which was a colorless transparent solution and which satisfied the following characteristic data:.

Wherein, the amount by weight of TP-<NUM> comprised <NUM> wt. % of the system.

<NUM> (<NUM>. 5190eq) of hexamethylene diisocyanate trimer <NUM> and <NUM> (<NUM>. 00003mol) of dibutyl phosphate were added to a <NUM> flask with a dropping funnel and a nitrogen inlet and stirred to obtain a solution. The resulting solution was heated to <NUM>. <NUM> (<NUM>. 1012eq) of TP-<NUM> was added dropwise to the flask over <NUM> minutes to react until the isocyanate group (NCO) content reached <NUM>%, and the heating was terminated to obtain a comparative polyether-modified polyisocyanate composition <NUM>, which was a colorless transparent solution and which satisfied the following characteristic data:.

<NUM> (<NUM>. 3531eq) of hexamethylene diisocyanate trimer <NUM> and <NUM> (<NUM>. 00028mol) of dibutyl phosphate were added to a <NUM> flask with a dropping funnel and a nitrogen inlet and stirred to obtain a solution. The resulting solution was heated to <NUM>. <NUM> (<NUM>. 1213eq) of T01-A was added dropwise to the flask over <NUM> minutes to react until the isocyanate group (NCO) content reached <NUM>%, and the heating was terminated to obtain a comparative polyether-modified polyisocyanate composition <NUM>, which was a colorless transparent solution and which satisfied the following characteristic data:.

<NUM> (<NUM>. 8857eq) of hexamethylene diisocyanate trimer <NUM> and <NUM> (<NUM>. 0003mol) of dibutyl phosphate were added to a <NUM> flask with a dropping funnel and a nitrogen inlet and stirred to obtain a solution. The resulting solution was heated to <NUM>. A mixture of <NUM> (<NUM>. 0243eq) of TP-<NUM> and <NUM> (<NUM>. 0446eq) of MPEG1000 was added dropwise to the flask over <NUM> minutes to react until the isocyanate group (NCO) content reached <NUM>%, and the heating was terminated to obtain a comparative polyether-modified polyisocyanate composition <NUM>, which was a colorless transparent solution and which satisfied the following characteristic data:.

Wherein, the average number-average molecular weight of TP-<NUM> and MPEG1000 was <NUM>/mol, and the total amount by weight of TP-<NUM> and MPEG1000 comprised <NUM> wt. % of the system, the average of the oxypropylene group content of TP-<NUM> and the oxypropylene group content of MPEG1000 was <NUM> wt.

<NUM> ( <NUM>. 8305eq) of hexamethylene diisocyanate uretdione <NUM> was added to a <NUM> flask with a dropping funnel and a nitrogen inlet and stirred to obtain a solution. The resulting solution was heated to <NUM>. <NUM> (<NUM>. 0649eq) of TP-<NUM> was added dropwise to the flask over <NUM> minutes to react until the isocyanate group (NCO) content reached <NUM>%, and the heating was terminated to obtain a comparative polyether-modified polyisocyanate composition <NUM>, which was a colorless transparent solution and which satisfied the following characteristic data:.

<NUM> (<NUM>. 1943eq) of hexamethylene diisocyanate trimer <NUM>, <NUM> (<NUM>. 3630eq) of hexamethylene diisocyanate uretdione <NUM> and <NUM> of DBTL12 were added to a <NUM> flask with a dropping funnel and a nitrogen inlet and stirred to obtain a solution. The resulting solution was heated to <NUM>. <NUM> (<NUM>. 0455eq) of TP-<NUM> was added dropwise to the flask over <NUM> minutes to react until the isocyanate group (NCO) content reached <NUM>%, and the heating was terminated to obtain a comparative polyether-modified polyisocyanate composition <NUM>, which was a colorless transparent solution and which satisfied the following characteristic data:.

Formulating the A-component: the isocyanate group reactive components Desmophen NH <NUM> and Desmophen NH <NUM> were mixed in a weight ratio of <NUM>:<NUM> at normal temperature and stirred for <NUM>-<NUM> minutes to obtain the A-component.

Table <NUM> showed the B-components of the two-component coatings and the coating performance test result of Examples <NUM>-<NUM>. Table <NUM> showed the B-components of the two-component coatings and the coating performance test result of Comparative Examples <NUM>-<NUM>. According to the B-components listed in Tables <NUM> and <NUM>, the B-component and the formulated A-component were mixed, NE310 was added (the amount of NE310 was <NUM> wt. % by weight of the B-component), and the mixture was stirred for <NUM>-<NUM> minutes at normal temperature to obtain the two-component coating. The molar ratio of NCO groups of the B-component to isocyanate-reactive groups of the A-component was <NUM>:<NUM>.

The two-component coatings of Examples <NUM>-<NUM> had long working times, short surface-drying times, high Pendulum hardnesses and high bubble-free film thicknesses (BFFTs); the two-component coatings had long operable times and high drying efficiency, and the coating layers formed by the coatings had high hardnesses.

B-component of Comparative Example <NUM> was the comparative polyether-modified polyisocyanate composition <NUM>, the amount of the polyoxyalkylene monoether structure of the comparative polyether-modified polyisocyanate composition <NUM> was <NUM> wt. %, the polyoxyalkylene monoether alcohol TP-<NUM> used in its preparation process comprised <NUM> wt. % of the system for preparing the comparative polyether-modified polyisocyanate composition <NUM>, the two-component coating of Comparative Example <NUM> had a short working time and the two-component coating had a short operable time.

B-component of Comparative Example <NUM> was the comparative polyether-modified polyisocyanate composition <NUM>, the amount of the polyoxyalkylene monoether structure of the comparative polyether-modified polyisocyanate composition <NUM> was <NUM> wt. %, the polyoxyalkylene monoether alcohol TP-<NUM> used in its preparation process comprised <NUM> wt. % of the system for preparing the comparative polyether-modified polyisocyanate composition <NUM>, the two-component coating of Comparative Example <NUM> had a long surface-drying time, and a low Pendulum hardness, the two-component coating had low drying efficiency, and the coating layer formed from the coating had a low hardness.

The B-component of Comparative Examples <NUM> and <NUM> was hexamethylene diisocyanate trimer <NUM> or <NUM>, which was a polyisocyanate not modified with polyether, and the two-component coating containing hexamethylene diisocyanate trimer <NUM> or <NUM> had short working times and low BFFTs, and the two-component coating had a short operable time.

The B-component of Comparative Example <NUM> was the comparative polyether-modified polyisocyanate composition <NUM>, the number-average molecular weight of polyoxyalkylene monoether alcohol T01-A used in its preparation process was <NUM>/mol, and the two-component coating of Comparative Example <NUM> had a short working time, and the two-component coating had a short operable time.

The B-component of Comparative Example <NUM> was the comparative polyether-modified polyisocyanate composition <NUM>, the oxypropylene group of the polyoxyalkylene monoether alcohol used in the preparation process of the comparative polyether-modified polyisocyanate composition <NUM> comprised less than <NUM> wt. % of the oxyalkylene group of the polyoxyalkylene monoether alcohol, the two-component coating of Comparative Example <NUM> had a low Pendulum hardness, and the coating layer formed from the two-component coating had a low hardness.

B-component of Comparative Example <NUM> was the comparative polyether-modified polyisocyanate composition <NUM>, the polyisocyanate used in its preparation process was hexamethylene diisocyanate uretdione <NUM>, which did not contain hexamethylene diisocyanate trimer, the two-component coating of Comparative Example <NUM> had a long surface-drying time and a low Pendulum hardness, the two-component coating had low drying efficiency, and the coating layer formed from the coating had a low hardness.

Claim 1:
A polyether-modified polyisocyanate composition, which is obtainable by the reaction of a system containing the following components:
a) a polyisocyanate having an isocyanate group functionality of <NUM>-<NUM>, containing at least <NUM> wt.% of hexamethylene diisocyanate trimer, pentamethylene diisocyanate trimer or a combination thereof;
b) a polyoxyalkylene monoether alcohol; and
c) optionally a catalyst;
the polyoxyalkylene monoether alcohol has a number-average molecular weight as measured according to the description of <NUM>/mol-<NUM>/mol and an oxypropylene group content of <NUM> wt.%-<NUM> wt.%, relative to the total weight of the oxyalkylene group of the polyoxyalkylene monoether alcohol;
the system has an equivalent ratio of isocyanate group to hydroxyl group of <NUM>:<NUM>-<NUM>:<NUM>;
the polyisocyanate composition has the following characteristics:
i) the average isocyanate functionality is <NUM>-<NUM>;
ii) the isocyanate group content is <NUM> wt.%-<NUM> wt.%, relative to the total weight of the polyisocyanate composition; and
iii) the amount of the polyoxyalkylene monoether structure is greater than <NUM> wt.% and less than <NUM> wt.%, relative to the total weight of the polyisocyanate composition.