Patent ID: 12195609

DETAILED DESCRIPTION OF THE INVENTION

As illustrated inFIG.1andFIG.2, a method of producing a reclaimed rubber made of recycled shoe material waste of an embodiment according to the present invention includes the following steps:

Step S1: a scrap rubber10, which is produced exclusively in a shoe manufacturing process, is obtained, wherein the scrap rubber10is a rubber waste produced during vulcanization of shoe outsole material.

Step S2: the scrap rubber10is shredded to form scrap rubber granules 20, wherein the scrap rubber granules 20 is a produced by a general apparatus for grinding, shredding, or crumbling. However, the scrap rubber granules 20 could also be produced or processed by other methods. In the current embodiment, a particle size of the scrap rubber granules 20 is smaller than or equal to 4 millimeters (mm). When the particle size of the scrap rubber granules 20 is greater than 4 mm, the particle size of scrap rubber granules 20 is too great, so that a surface area of the scrap rubber granules 20 is insufficient, leading to a low devulcanization reaction rate.

Step S3: the scrap rubber granules 20 undergoes a devulcanization reaction to form a reclaimed rubber30, wherein a principle of the devulcanization reaction is breaking a part of specific polymer crosslinking chains (such as S—S bonds and S—C bonds) of the scrap rubber granules 20 by heating and mechanical shearing. In the step S3, the scrap rubber granules 20 undergo the devulcanization reaction at 60 to 190 degrees Celsius. More specifically, the reclaimed rubber30is produced by mixing and compounding the scrap rubber granules 20 and N,N′-Thio-bis(phthalimide). In other embodiment, the reclaimed rubber30is produced by mixing and compounding the scrap rubber granules 20 and derivatives of N,N′-Thio-bis(phthalimide). During the process of mixing and compounding, zinc oxide or magnesium oxide could be optionally added according to necessity. During the process of mixing and compounding, stearic acid or derivatives of stearic acid could be optionally added on the required demand. In the current embodiment, 100 parts of scrap rubber granules 20, 1 to 20 part(s) of N,N′-Thio-bis(phthalimide) or the derivatives of N, N′-Thio-bis(phthalimide), 0 to 5 part(s) of zinc oxide or magnesium oxide, and 0 to 5 part(s) of stearic acid or the derivatives of stearic acid by weight are mixed, wherein N,N′-Thio-bis(phthalimide) or the derivatives of N,N′-Thio-bis(phthalimide) could be Mediaplast 62 (the product of Kettlitz-Chemie GmbH & Co. KG), REGEN AGENT S (the product of SIN RUBTECH), or a combination thereof. In other embodiment, contents of ingredients of the reclaimed rubber30, including the content of the scrap rubber granules 20, the content of N,N′-Thio-bis(phthalimide) or the derivatives of N,N′-Thio-bis(phthalimide), the content of stearic acid or the derivatives of stearic acid, the content of zinc oxide or magnesium oxide, could be properly adjusted on the required demand.

Additionally, in the step S3, the devulcanization of the scrap rubber granules 20 could be a batch devulcanization or a continuous devulcanization.

As illustrated inFIG.3, the batch devulcanization includes the following steps:

Step S301: the scrap rubber granules 20 and N,N′-Thio-bis(phthalimide) are put into a Banbury mixer or a two-roll mill to undergo a first compound at 80-160 degrees Celsius for 5-30 minutes, thereby forming an admixture. In other embodiments, N,N′-Thio-bis(phthalimide) could be substituted with the derivatives of N,N′-Thio-bis(phthalimide). In other embodiments, additives could be added during the first compound, wherein the additives could be zinc oxide or magnesium oxide. Additionally, stearic acid or derivatives of stearic acid could be added during the first compound.

Step S302: the admixture is put into the Banbury mixer or the two-roll mill to undergo a second compound at 80-160 degrees Celsius for 20-60 minutes to form the reclaimed rubber30.

As illustrated inFIG.4, the continuous devulcanization includes the following steps:

Step S303: the scrap rubber granules 20 and N,N′-Thio-bis(phthalimide) are mixed to form a mixed material, wherein N,N′-Thio-bis(phthalimide) could be substituted with the derivatives of N,N′-Thio-bis(phthalimide). In other embodiment, zinc oxide or magnesium oxide could be added during the mixing process. Moreover, stearic acid or the derivatives of stearic acid could be added during the mixing process.

Step S304: the mixed material is fed into a twin-screw extruder, wherein the twin-screw extruder runs at a rotational speed in a range of 150 rpm to 350 rpm to compound the mixed material at 60-190 degrees Celsius, thereby forming the reclaimed rubber30. In the step S304, by shearing the mixed material via the twin-screw extruder, specific cross-links (e.g. S—S bonds) of the scrap rubber granules 20 are broken, but most of the backbone chains (C—C bonds) of the scrap rubber granules 20 are not broken, so that the reclaimed rubber30that is obtained has similar properties of original unvulcanized rubber.

A gel content of the reclaimed rubber30obtained through either the continuous devulcanization or the batch devulcanization is measured according to ASTM D2765. The reclaimed rubber30is subjected to a Soxhlet extractor with toluene as solvent for 24 hours to obtain the gel content of the reclaimed rubber30. Generally, a gel content of uncrosslinked rubber is approximately 45%, and a gel content of crosslinked rubber is approximately 88%. The gel content of the reclaimed rubber30of the current embodiment preferably is in a range of 55% to 75%. It should be noted that when the gel content of the reclaimed rubber30is higher than 75%, it means the devulcanization efficiency of the reclaimed rubber30is not satisfactory, so as not to be able to maintain the processibility of the reclaimed rubber30for the reuse. When the gel content of the reclaimed rubber30is below 55%, backbone chains of the reclaimed rubber30are probably broken, leading to deteriorative physical properties.

As illustrated inFIG.1andFIG.5, a method of consuming the rubber waste produced during shoe manufacturing process of another embodiment according to present invention, includes the following steps:

Step P1: the scrap rubber10is collected exclusively during the shoe manufacturing process.

Step P2: the scrap rubber10is shredded to form the scrap rubber granules 20, wherein a method for shredding the scrap rubber10in the step P2is the same as that in step S2of the method of producing a reclaimed rubber of the embodiment mentioned above. A particle size of the scrap rubber granules 20 is smaller than or equal to 4 mm.

Step P3: the scrap rubber granules 20 undergo a devulcanization reaction to produce the reclaimed rubber30, wherein a technique of the devulcanization reaction and a reaction temperature of the step P3are the same as those in the step S3, thus the relative details are not described herein. A gel content of the reclaimed rubber30is measured according to ASTM D2765. The reclaimed rubber30is subjected to a Soxhlet extractor with toluene as solvent for 24 hours to obtain the gel content of the reclaimed rubber30. The gel content of the reclaimed rubber30of the current embodiment preferably is in a range of 55% to 75%.

Step P4: the reclaimed rubber30is mixed with a basic rubber formulation to form a reclaimed rubber formulation. After the reclaimed rubber formulation and a crosslinking agent are compounded to undergo a process of vulcanization, a reclaimed material for manufacturing shoes is formed. In an embodiment, after the reclaimed rubber30, the basic rubber formulation, and the crosslinking agent are compounded, the mixture is put into the hot-press mold to vulcanize at 140 to 160 degrees Celsius to form the reclaimed material for manufacturing shoes. In another embodiment, the basic rubber formulation includes a rubber material, silica, and an additive, wherein the rubber material, silica, and the additive are compounded to form the basic rubber formulation. After that, the basic rubber formulation is compounded with the reclaimed rubber30to form a reclaimed rubber formulation.

The reclaimed material for manufacturing shoes provided in another embodiment includes said reclaimed rubber formulation, which is constituted by the basic rubber formulation and said reclaimed rubber30, and said crosslinking agent.

A content of the basic rubber formulation in the reclaimed material for manufacturing shoes is in a range from 94.8 wt % to 65 wt %. In the current embodiment, the basic rubber formulation includes 100 parts of the rubber material, 30 to 100 parts of silica (SiO2), and 5 to 60 parts of the additive by weight. The additive is selected from a group including an antioxidant, a softener, an activator, zinc oxide, a silane coupling agent, an antifogging agent, and a combination thereof. However, the additive is not limited to the above-mentioned additives.

A content of the reclaimed rubber30in the reclaimed material for manufacturing shoes is in a range from 5 wt % to 30 wt %. In a preferred embodiment, the content of the reclaimed rubber30in the reclaimed material for manufacturing shoes is in a range from 15 wt % to 30 wt %.

A content of the crosslinking agent in the reclaimed material for manufacturing shoes is in a range from 0.2 wt % to 5 wt %. In the current embodiment, the crosslinking agent includes 0.1-4.9 wt % of sulfur and 0.1-4.9 wt % of vulcanization accelerator, wherein the vulcanization accelerator is selected from a group including 2,2′-dibenzothiazyl disulfide, tetrabenzyl thiuram disulfide, zinc dialkyldithiophosphate, diisopropyl xanthogen polysulphide, isopropylxanthic disulfide, thiurams, dithiocarbamates, sulphenamides, thiazoles, guanidines, thioureas, and a combination thereof. In the current embodiment, a total amount of the basic rubber formulation, the reclaimed rubber30, and the crosslinking agent is equal to 100% of the reclaimed material.

The reclaimed rubber30is obtained by processing the scrap rubber10with the method of producing a reclaimed rubber made of recycled shoe material waste. By utilizing the method, the backbone chain (C—C bonds) of the scrap rubber10could be maintained, so that the reclaimed rubber30could have similar properties of original unvulcanized rubber. Thus, the reclaimed rubber30and the basic rubber formulation could be uniformly compounded to form the reclaimed rubber formulation, thereby increasing the content of the reclaimed rubber30in the reclaimed material for manufacturing shoes and reducing waste of the scrap rubber10to achieve the circular economy. When the content of the reclaimed rubber30in the reclaimed material for manufacturing shoes is between 5 wt % and 30 wt %, the reclaimed rubber formulation, which is formed by compounding the reclaimed rubber30and the basic rubber formulation, could be well-vulcanized. Therefore, the mechanical properties of the reclaimed material for manufacturing shoes that are measured could fulfill a requirement for shoe outsole material. On the contrary, when the content of the reclaimed rubber30in the reclaimed material for manufacturing shoes is greater than 30 wt %, the mechanical properties of the reclaimed material for manufacturing shoes are reduced. As a result, a part of the mechanical properties of the reclaimed material for manufacturing shoes, such as tensile strength and abrasion resistance, could not attain to the required standards for shoe outsole material. When the content of the reclaimed rubber30in the reclaimed material for manufacturing shoes is less than 5 wt %, the reclaimed rubber30could not efficiently consume the rubber waste generated during the shoe manufacturing process. Thus, the rubber waste during a rubber manufacturing process could not be reduced efficiently.

Additionally, a shoe outsole material of a comparative example 1 and reclaimed materials of experimental embodiments 1-4 are provided in the present invention, and the comparative example 1 and the experimental embodiments 1-4 are respectively measured to obtain the mechanical properties thereof.

Composition and Formula:

The comparative example 1 is the basic rubber formulation that includes 100 parts of the rubber material, 30 to 100 parts of silica, and 5 to 60 parts of additive by weight. The rubber material includes 50 to 80 parts of polybutadiene rubber (BR), 15 to 35 parts of natural rubber, and 5-15 parts of nitrile butadiene rubber (NBR) by weight. The additive is selected from a group including the antioxidant, the softener, the activator, zinc oxide, the silane coupling agent, the antifogging agent, and the combination thereof. However, the additive is not limited to the above-mentioned additives. After the basic rubber formulation is compounded with the crosslinking agent, a mixture of the basic rubber formulation and the crosslinking agent is vulcanized (cross-linked) at 140 to 160 degrees Celsius in the hot-press mold.

In the experimental embodiment 1, the reclaimed rubber formulation contains 85 wt % of a basic rubber formulation and 15 wt % of the reclaimed rubber30. The basic rubber formulation includes 100 parts of the rubber material, 30 to 100 parts of silica, and 5 to 60 parts of additive by weight, wherein the rubber material includes 50 to 80 parts of polybutadiene rubber (BR), 15 to 35 parts of natural rubber, and 5-15 parts of nitrile butadiene rubber (NBR) by weight. The additive is selected from a group including the antioxidant, the softener, the activator, zinc oxide, the silane coupling agent, the antifogging agent, and the combination thereof. However, the additive is not limited to the above-mentioned additives. Said reclaimed rubber formulation and the crosslinking agent are compounded and put into the hot-press mold to undergo the vulcanization process (crosslink) at 140 to 160 degrees Celsius.

In the experimental embodiment 2, the reclaimed rubber formulation contains 80 wt % of a basic rubber formulation and 20 wt % of the reclaimed rubber30. The basic rubber formulation includes 100 parts of the rubber material, 30 to 100 parts of silica, and 5 to 60 parts of additive by weight, wherein the rubber material includes 50 to 80 parts of polybutadiene rubber (BR), 15 to 35 parts of natural rubber, and 5-15 parts of nitrile butadiene rubber (NBR) by weight. The additive is selected from a group including the antioxidant, the softener, the activator, zinc oxide, the silane coupling agent, the antifogging agent, and the combination thereof. However, the additive is not limited to the above-mentioned additives. Said reclaimed rubber formulation and the crosslinking agent are compounded and put into the hot-press mold to undergo the vulcanization process (crosslink) at 140 to 160 degrees Celsius.

In the experimental embodiment 3, the reclaimed rubber formulation contains 70 wt % of a basic rubber formulation and 30 wt % of the reclaimed rubber30. The basic rubber formulation includes 100 parts of the rubber material, 30 to 100 parts of silica, and 5 to 60 parts of additive by weight, wherein the rubber material includes 50 to 80 parts of polybutadiene rubber (BR), 15 to 35 parts of natural rubber, and 5-15 parts of nitrile butadiene rubber (NBR) by weight. The additive is selected from a group including the antioxidant, the softener, the activator, zinc oxide, the silane coupling agent, the antifogging agent, and the combination thereof. However, the additive is not limited to the above-mentioned additives. Said reclaimed rubber formulation and the crosslinking agent are compounded and put into the hot-press mold to undergo the vulcanization process (crosslink) at 140 to 160 degrees Celsius.

In the experimental embodiment 4, the reclaimed rubber formulation contains 50 wt % of a basic rubber formulation and 50 wt % of the reclaimed rubber30. The basic rubber formulation includes 100 parts of the rubber material, 30 to 100 parts of silica, and 5 to 60 parts of additive by weight, wherein the rubber material includes 50 to 80 parts of polybutadiene rubber (BR), 15 to 35 parts of natural rubber, and 5-15 parts of nitrile butadiene rubber (NBR) by weight. The additive is selected from a group including the antioxidant, the softener, the activator, zinc oxide, the silane coupling agent, the antifogging agent, and the combination thereof. However, the additive is not limited to the above-mentioned additives. Said reclaimed rubber formulation and the crosslinking agent are compounded and put into the hot-press mold to undergo the vulcanization process (crosslink) at 140 to 160 degrees Celsius.

Mechanical properties measurement and measuring result:

The shoe outsole material of the comparative example 1 and the reclaimed materials of the experimental embodiments 1-4 for manufacturing shoes are measured by the following standards to obtain the mechanical properties of the materials. A hardness is measured according to ASTM D-2240, by a Shore A durometer. A tearing strength is measured by a tensile testing machine according to DIN 53507-A. A tensile strength is measured by the tensile testing machine according to DIN 53504. An elongation at break is measured by a tensile testing machine at an elongation rate of 200 mm/min according to DIN 53504. An abrasion resistance is measured by an abrasion tester according to DIN 53516. The measuring results are shown in the following table 1.

TABLE 1the measuring results of the mechanical properties of thecomparative example 1 and the experimental embodiments 1-4.ComparativeExperimentalExperimentalExperimentalExperimentalMechanical PropertiesExample 1Embodiment 1Embodiment 2Embodiment 3Embodiment 4Reclaimed rubberspec015203050(wt %) in thereclaimed rubberformulationHardness (A)65 ± 365.86563.562.560Tearing Strength≥1229.728.223.223.021.1(N/mm)Tensile Strength≥1422.417.318.415.812.5(MPa)Elongation at break≥400678.4620.9606.0524552(%)Abrasion Resistance≤8039.056.454.378.186.6(CBMM)

More specifically, the mechanical properties of the shoe outsole material of the comparative example 1, including the hardness, the tearing strength, the tensile strength, the elongation at break, and the abrasion resistance, meet the criteria of material for shoes. The mechanical properties of the experimental embodiments 1-3 are close to those of the comparative example 1. The experimental embodiments 1-3 have the hardness between 62 and 68 according to ASTM D-2240, the tensile strength greater than or equal to 14 MPa according to DIN 53504, the elongation at break greater than or equal to 400% according to DIN 53504, the tearing strength greater than or equal to 12 N/mm according to DIN 53507-A, and the abrasion resistance smaller than or equal to 80 mm3according to DIN 53516. Therefore, the reclaimed materials of the experimental embodiments 1-3 meet required standards of the shoe outsole material, so that the reclaimed material of the experimental embodiments 1-3 could be utilized to manufacture shoes. Regarding the measuring result of the experimental embodiment 4, the hardness, the tensile strength, and the abrasion resistance of the experimental embodiment 4 do not meet the required standards of the shoe outsole material, so that the reclaimed material of the experimental embodiment 4 could not be used as the shoe outsole material.

Moreover, the present invention provides a shoe outsole material of a comparative example 2 and reclaimed materials of experimental embodiments 5-7, and compositions and mechanical properties of the comparative example 2 and the experimental embodiments 1˜4 are respectively listed below.

Composition and Formula:

The comparative example 2 is the basic rubber formulation including 100 parts of the rubber material, 30 to 100 parts of silica, and 5 to 60 parts of additive by weight. The rubber material includes 70 to 90 parts of polybutadiene rubber (BR), 5 to 15 parts of natural rubber, and 5-15 parts of nitrile butadiene rubber (NBR) by weight. The additive is selected from a group including the antioxidant, the softener, the activator, zinc oxide, the silane coupling agent, the antifogging agent, and the combination thereof. However, the additive is not limited to the above-mentioned additives. After the basic rubber formulation is mixed with the crosslinking agent, a mixture of the basic rubber formulation and the crosslinking agent is vulcanized (cross-linked) at 140 to 160 degrees Celsius in the hot-press mold.

In the experimental embodiment 5, the reclaimed rubber formulation contains 80 wt % of a basic rubber formulation and 20 wt % of the reclaimed rubber30. The basic rubber formulation includes 100 parts of the rubber material, 30 to 100 parts of silica, and 5 to 60 parts of additive by weight, wherein the rubber material includes 70 to 90 parts of polybutadiene rubber (BR), 5 to 15 parts of natural rubber, and 5-15 parts of nitrile butadiene rubber (NBR) by weight. The additive is selected from a group including the antioxidant, the softener, the activator, zinc oxide, the silane coupling agent, the antifogging agent, and the combination thereof. However, the additive is not limited to the above-mentioned additives. Said reclaimed rubber formulation and the crosslinking agent are compounded and put into the hot-press mold to be vulcanized (cross-linked) at 140 to 160 degrees Celsius.

In the experimental embodiment 6, the reclaimed rubber formulation contains 50 wt % of a basic rubber formulation and 50 wt % of the reclaimed rubber30. The basic rubber formulation includes 100 parts of the rubber material, 30 to 100 parts of silica, and 5 to 60 parts of additive by weight, wherein the rubber material includes 70 to 90 parts of polybutadiene rubber (BR), 5 to 15 parts of natural rubber, and 5-15 parts of nitrile butadiene rubber (NBR) by weight. The additive is selected from a group including the antioxidant, the softener, the activator, zinc oxide, the silane coupling agent, the antifogging agent, and the combination thereof. However, the additive is not limited to the above-mentioned additives. Said reclaimed rubber formulation and the crosslinking agent are compounded and put into the hot-press mold to be vulcanized (cross-linked) at 140 to 160 degrees Celsius.

In the experimental embodiment 7, the reclaimed rubber formulation contains 85.3 wt % of a basic rubber formulation and 14.7 wt % of 40 mesh rubber particles. The basic rubber formulation includes 100 parts of the rubber material, 30 to 100 parts of silica, and 5 to 60 parts of additive by weight, wherein the rubber material includes 70 to 90 parts of polybutadiene rubber (BR), 5 to 15 parts of natural rubber, and 5-15 parts of nitrile butadiene rubber (NBR) by weight. The additive is selected from a group including the antioxidant, the softener, the activator, zinc oxide, the silane coupling agent, the antifogging agent, and the combination thereof. However, the additive is not limited to the above-mentioned additives. Said reclaimed rubber formulation and the crosslinking agent are compounded and put into the hot-press mold to be vulcanized (cross-linked) at 140 to 160 degrees Celsius.

Mechanical properties measurement and measuring result:

The shoe outsole material of the comparative example 2 and the reclaimed materials of the experimental embodiments 5-7 for manufacturing shoes are measured according to the following standards to obtain the mechanical properties of the materials. A hardness is measured according to ASTM D-2240, by a Shore A durometer. A tensile strength at 300% elongation is measured by a tensile testing machine at an elongation rate of 500 mm/min according to ASTM D412 (cutting die C). A tearing strength is measured by a tensile testing machine according to ASTM D624. A tensile strength is measured by a tensile testing machine according to ASTM D412 (cutting die C). An elongation at break is measured by a tensile testing machine at an elongation rate of 500 mm/min according to ASTM D412 (cutting die C). An abrasion resistance is measured by an Akron abrasion tester. The measuring results are shown in the following table 2.

TABLE 2the measuring results of the mechanical properties of thecomparative example 2 and the experimental embodiments 5-7.ComparativeExperimentalExperimentalExperimentalMechanical Propertiesexample 2embodiment 5embodiment 6embodiment 7Reclaimed rubber (wt %)spec020500in the reclaimed rubberformulation40 mesh rubber particles00014.7(wt %)Hardness (A)67 ± 368-7068-6970-7266-69Tensile strength at 300%≥3536.744.56733.8elongation (kg/cm2)Tearing Strength (kg/cm)≥3555.850.34345Tensile Strength (kg/cm2)≥10015014093120Elongation at break (%)≥550746669.3394.8678.8Abrasion Resistance (cc.)≤0.350.230.32—0.33

More specifically, the mechanical properties of the shoe outsole material of the comparative example 2, including the hardness, the tensile strength at 300% elongation, the tearing strength, the tensile strength, the elongation at break, and the abrasion resistance, meet criteria of material for shoes. The mechanical properties of the experimental embodiment 5 are close to those of the comparative example 2. The experimental embodiment 5 has the hardness between 68 and 70 according to ASTM D-2240, the tensile strength at 300% elongation greater than or equal to 35 kg/cm2according to ASTM D412 (cutting die C), the tensile strength greater than or equal to 100 kg/cm2according to ASTM D412 (cutting die C), the elongation at break greater than or equal to 550% according to ASTM D412 (cutting die C), the tearing strength greater than or equal to 35 kg/cm2according to ASTM D624, and the abrasion resistance smaller than or equal to 0.35 cc. according to Akron. Therefore, the reclaimed material of the experimental embodiment 5 meets required standards of the shoe outsole material, so that the reclaimed material of the experimental embodiment 5 could be utilized to manufacture shoes.

Comparing with the measuring result of the experimental embodiment 5, the measuring result of the experimental embodiment 6, including the hardness, the tensile strength, the elongation at break, and the abrasion resistance, does not meet the required standards of the shoe outsole material. Besides, comparing with the experimental embodiment 7 and the comparative example 2, additional 40 mesh rubber particles are added to the experimental embodiment 7. The measuring result of the experimental embodiment 7, the tensile strength at 300% elongation of the experimental embodiment 7 is smaller than 35 kg/cm2, so that the shoe outsole material of the experimental embodiment 7 does not fulfill the required standards to the mechanical properties of the material for manufacturing shoes.

With such design, the method of producing the reclaimed rubber could be applied to the shoe manufacturing industry. The scrap rubber is processed to obtain the scrap rubber granules 20, and then the scrap rubber granules 20 undergo the devulcanizationreaction to form the reclaimed rubber30. Since only the specific cross-links (e.g. S—S bonds) are broken during the devulcanization of the scrap rubber granules 20, most of the backbone chain (C—C bonds) of the scrap rubber granules 20 are remained to make the reclaimed rubber30have the similar properties of the original unvulcanized rubber. Additionally, the reclaimed rubber30could be compounded with the basic rubber formulation to produce the reclaimed material for manufacturing shoes. As shown in table 1 and table 2, when the content of the reclaimed rubber30in the reclaimed material is between 5 wt % and 30 wt %, the mechanical properties of the reclaimed material fulfill the required standards of the shoe outsole material. Thus, the reclaimed rubber30produced by the method of the present invention could be reproduced to the reclaimed material for manufacturing shoes. Besides, by using the reclaimed rubber30produced by the method of the present invention, the content of the reclaimed rubber30in the reclaimed material for manufacturing shoes could be increased to efficiently reduce and consume the rubber waste during the manufacturing process of shoes, thereby achieving the object of reducing waste generated during the rubber manufacturing process of shoes. Additionally, the reclaimed material could be utilized for manufacturing shoes to achieve the circular economy.

It must be pointed out that the embodiment described above is only a preferred embodiment of the present invention. All equivalent composites and methods which employ the concepts disclosed in this specification and the appended claims should fall within the scope of the present invention.