CN113881130B - EVA foaming material with high wear resistance for shoes and preparation method thereof - Google Patents

EVA foaming material with high wear resistance for shoes and preparation method thereof Download PDF

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CN113881130B
CN113881130B CN202111315317.0A CN202111315317A CN113881130B CN 113881130 B CN113881130 B CN 113881130B CN 202111315317 A CN202111315317 A CN 202111315317A CN 113881130 B CN113881130 B CN 113881130B
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parts
foaming
agent
eva
shoes
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CN113881130A (en
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党明江
秦培新
贺金林
吴志诚
罗小傅
梁志新
王瑞龙
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Anta China Co Ltd
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Anta China Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
    • C08J9/06—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent
    • C08J9/10—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent developing nitrogen, the blowing agent being a compound containing a nitrogen-to-nitrogen bond
    • C08J9/102—Azo-compounds
    • C08J9/103—Azodicarbonamide
    • A—HUMAN NECESSITIES
    • A43—FOOTWEAR
    • A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
    • A43B13/00—Soles; Sole-and-heel integral units
    • A43B13/02—Soles; Sole-and-heel integral units characterised by the material
    • A43B13/04—Plastics, rubber or vulcanised fibre
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/0014—Use of organic additives
    • C08J9/0023—Use of organic additives containing oxygen
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/0061—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof characterized by the use of several polymeric components
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/0066—Use of inorganic compounding ingredients
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/0095—Mixtures of at least two compounding ingredients belonging to different one-dot groups
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2203/00—Foams characterized by the expanding agent
    • C08J2203/04—N2 releasing, ex azodicarbonamide or nitroso compound
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2323/04—Homopolymers or copolymers of ethene
    • C08J2323/08—Copolymers of ethene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2353/00—Characterised by the use of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2409/00—Characterised by the use of homopolymers or copolymers of conjugated diene hydrocarbons
    • C08J2409/06—Copolymers with styrene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2423/04—Homopolymers or copolymers of ethene
    • C08J2423/08—Copolymers of ethene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2427/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers
    • C08J2427/02—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment
    • C08J2427/12—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
    • C08J2427/18—Homopolymers or copolymers of tetrafluoroethylene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2451/00—Characterised by the use of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers
    • C08J2451/06—Characterised by the use of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2453/00—Characterised by the use of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
    • Y02P70/62—Manufacturing or production processes characterised by the final manufactured product related technologies for production or treatment of textile or flexible materials or products thereof, including footwear

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  • Chemical & Material Sciences (AREA)
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  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Emergency Medicine (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)

Abstract

The invention belongs to the technical field of foaming materials for shoes, and discloses an EVA (ethylene-vinyl acetate) foaming material for shoes with high wear resistance and a preparation method thereof, wherein the foaming material is prepared by mixing and foaming formula materials, and the formula materials comprise the following raw materials in parts by weight: 40-60 parts of ethylene-vinyl acetate copolymer; 20-30 parts of polyolefin elastomer; 5-10 parts of maleic anhydride grafting; 10-15 parts of an anti-wear agent which is a polytetrafluoroethylene and styrene-butadiene rubber composite solid material; 0.2-1 part of stearic acid; 0.2 to 1 part of zinc stearate; 0.3-2 parts of zinc oxide; 2-5 parts of talcum powder; 0.3 to 1.5 portions of bridging agent; 1.5 to 5 parts of foaming agent. The invention improves the wear resistance, compression resistance, rebound and softness of the EVA foaming material, does not influence the slip resistance of the foaming material, and has important practical significance for expanding the ground contact EVA foaming sole.

Description

EVA foaming material with high wear resistance for shoes and preparation method thereof
Technical Field
The application relates to the technical field of foaming materials for shoes, in particular to an EVA foaming material for shoes with high wear resistance and a preparation method thereof.
Background
Along with the improvement of living standard, sports exercise is continuously popularized, and the requirements of people on the comfort of shoes are higher and higher, and meanwhile, the requirements on the functionality of the shoes are also higher. EVA foaming soles are continuously improved towards the performance directions of light weight, softness, elasticity, compression resistance change and the like, but the comprehensive performance of the EVA foaming soles is difficult to combine, for example, the comfort and the wear resistance of the EVA foaming soles are difficult to reach the standard under the condition of ensuring the performance of light weight, softness, elasticity, compression resistance change and the like. In order to pursue comfort in the market, the hardness of the sole material is generally low, but the sole is neglected to be too soft, so that bare foot sprain is easily caused, and fatigue is easily caused after standing for too long. In addition, the low hardness light foamed sole is not in direct contact due to poor wear resistance, and a rubber sole needs to be attached, so that the weight of the whole shoe is difficult to lighten.
On the other hand, in order to improve the wear resistance of EVA foam, the industry generally adopts a means of adding wear-resistant powder to improve the wear resistance of the material. For example, chinese patent document with application publication number CN 107936360A discloses a wear-resistant EVA injection crosslinked foaming material, the raw materials of the foaming material include: 5-30 parts of vinyl copolymer, 40-60 parts of EVA,1-15 parts of MAH,0.1-3 parts of dispersing agent, 0.1-1.5 parts of initiator, 0-1 part of inhibitor, 0-1.5 parts of second monomer, 5-20 parts of toughening agent, 0-15 parts of foaming accelerator, 1-10 parts of foaming agent, 0.5-1.5 parts of cross-linking agent, 5-15 parts of ultra-fine ultra-high molecular weight polyethylene (average particle size of 80-150 mu m) and 0.5-3 parts of filler.
In the prior art, the wear resistance of the EVA foaming material is mainly realized by adding the ultra-high molecular weight polyethylene with excellent wear resistance and strong comprehensive performance. However, the comprehensive properties such as wear resistance and compression resistance are still to be improved.
Disclosure of Invention
In view of the above, the application provides an EVA foaming material for shoes with high wear resistance and a preparation method thereof.
The invention provides a high-wear-resistance EVA foaming material for shoes, which is prepared by mixing and foaming formula materials, wherein the formula materials comprise the following raw materials in parts by weight:
the wear-resistant agent is a polytetrafluoroethylene and styrene-butadiene rubber composite solid material.
Preferably, the vinyl acetate content of the ethylene-vinyl acetate copolymer is between 18% and 40%.
Preferably, the wear-resistant agent is a composite solid material obtained by emulsion blending and physical precipitation of polytetrafluoroethylene emulsion and styrene-butadiene rubber emulsion.
Further preferably, the antiwear agent is obtained in the following specific manner: mixing polytetrafluoroethylene emulsion and styrene-butadiene rubber emulsion under stirring, continuing stirring for a certain time, adding saturated saline until solid is separated out, crushing the obtained solid, placing the crushed solid into clear water, soaking for at least 12 hours, and vacuum drying to obtain the polytetrafluoroethylene and styrene-butadiene rubber composite solid material.
Preferably, the emulsion particles of the polytetrafluoroethylene emulsion have a particle size of 0.1-1 μm and a solid content of 50-65%.
Preferably, the solid content of the styrene-butadiene rubber emulsion is 50-65%, and the mass ratio of the polytetrafluoroethylene emulsion to the styrene-butadiene rubber emulsion is 1: (1-3).
Preferably, the bridging agent is 1, 4-bis-tert-butyldiisopropylbenzene peroxide; the foaming agent is azodicarbonamide.
The invention provides a preparation method of EVA foaming material for shoes, which comprises the following steps:
s1, mixing all the weighed raw materials except for a bridging agent and a foaming agent;
s2, adding the bridging agent and the foaming agent into the materials mixed in the step S1, and mixing;
s3, granulating the mixture obtained in the step S2, and standing and cooling;
and S4, carrying out an IP one-time molding process or an MD (machine direction) secondary molding process on the cooled particles in the step S3 to obtain the EVA foaming material for the high-wear-resistance shoes.
In the embodiment of the invention, the IP one-time molding process specifically comprises: and (3) injecting the particles cooled in the step (S3) through an EVA injection machine, and vulcanizing and foaming to obtain the EVA foaming material for the shoes.
In an embodiment of the present invention, the MD over-molding process specifically includes: weighing the cooled particles in the step S3 according to the mold body, and performing small foaming; and (3) performing hot pressing, cooling and shaping on the coarse embryo obtained by the small foaming to obtain the EVA foaming material for the shoes.
Compared with the prior art, in the EVA foaming formula material system, the polytetrafluoroethylene and styrene-butadiene rubber composite solid material is used as the wear-resistant agent; according to weight portions, the system comprises 40 to 60 portions of EVA,20 to 30 portions of polyolefin elastomer, 5 to 10 portions of maleic anhydride grafted polyethylene, 10 to 15 portions of the wear-resistant agent and corresponding functional additives. In the invention, the material can be endowed with better wear resistance by adopting smaller filling quantity of the wear-resistant agent, and good mechanical property can be maintained; meanwhile, the introduction of the styrene-butadiene rubber can improve the flexibility and elasticity of the EVA foaming material; the vinyl polymer grafted maleic anhydride is used as a compatilizer, so that the compatibility of the polytetrafluoroethylene and the EVA base material is improved, and the polytetrafluoroethylene plays a certain role in enhancing the base material, so that the EVA foaming material for the shoes has good supporting property and compression property. Therefore, the wear resistance, compression resistance, rebound and softness of the EVA foaming material are improved, the slip resistance of the foaming material is not affected, and the EVA foaming sole has important practical significance for expanding the ground contact EVA foaming sole.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully, and it is apparent that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
The application provides a high wear-resistant EVA foaming material for shoes, which is prepared by mixing and foaming formula materials, wherein the formula materials comprise the following raw materials in parts by weight:
the wear-resistant agent is a polytetrafluoroethylene and styrene-butadiene rubber composite solid material.
The EVA foaming material provided by the invention has higher wear resistance, good compression resistance and good comfort, and can be used for preparing EVA foaming soles with excellent comprehensive performance.
The EVA foaming formula provided by the embodiment of the invention comprises the following raw materials in parts by weight: 40-60 parts of ethylene-vinyl acetate copolymer; 20-30 parts of polyolefin elastomer; 5-10 parts of maleic anhydride grafted polyethylene. The ethylene-vinyl acetate copolymer is EVA for short, and is formed by copolymerizing monomer ethylene and Vinyl Acetate (VA). Further, the mass content of vinyl acetate in the ethylene-vinyl acetate copolymer is 18-40%. The ethylene-vinyl acetate copolymer can be one or more of EVA7350M, EVA7360M, EVA7470M, EVA W. EVA is copolymer of ethylene and vinyl acetate, the content of vinyl acetate of different types is different, the VA content of EVA7350M is 18%, EVA7350, 7360 and 7470 are produced by table plastic, EVA40W is produced by DuPont in U.S., and VA content is 40%
Further, the polyolefin elastomer may be one or more of Inuse 9100, inuse 9107, inuse 9500, inuse 9507 (the INFUSE series is an OBCs polyolefin block copolymer of Dow).
Further, the type of the maleic anhydride grafted polyethylene can beE588 (DuPont, U.S.A.), the present application is not particularly limited to such starting products.
In some embodiments of the invention, the ethylene-vinyl acetate copolymer: 40 parts by weight; polyolefin thermoplastic elastomer: 30 parts by weight; maleic anhydride grafted polyethylene: 10 parts by weight. In other embodiments, the ethylene-vinyl acetate copolymer may be 50 parts by weight or 60 parts by weight, etc.
The formula material provided by the embodiment of the invention comprises 10-15 parts by mass of an anti-wear agent, wherein the anti-wear agent is a polytetrafluoroethylene and styrene-butadiene rubber composite solid material, and the dosage of the anti-wear agent can be 10 parts, 11 parts, 12 parts, 13 parts, 15 parts and the like.
Polytetrafluoroethylene is commonly called as "plastic king", is almost insoluble in all solvents, has heat resistance and cold resistance, can be used for a long time at-180-260 ℃, has small friction coefficient and excellent self-lubricity, and can be used as a wear-resistant filler of engineering plastics. However, the powder filler is generally large in particle size and small in specific surface area, and needs to be added in a relatively large amount to achieve the abrasion-resistant effect, so that the material performance is deteriorated when the powder filler is applied to shoes such as EVA.
Solves the problem of the wear resistance of the EVA foaming material, and is always the difficulty in preparing the EVA foaming material with excellent comprehensive properties such as light weight, softness, elasticity, compression resistance and the like in industry. The invention introduces polytetrafluoroethylene and styrene-butadiene rubber to form the composite wear-resistant agent (which can be called as polytetrafluoroethylene/styrene-butadiene rubber composite material), so that the rebound and softness of the material can be improved while the wear-resistant effect is achieved.
In the preferred embodiment of the invention, the wear-resistant agent is a composite solid material obtained by blending polytetrafluoroethylene emulsion and styrene-butadiene rubber emulsion and physically separating out the emulsion. According to the preparation method, the polytetrafluoroethylene is dispersed in the rubber matrix in an emulsion blending mode, so that the composite wear-resistant agent with small particle size and good dispersion can be obtained. In addition, the composite wear-resistant agent is a solid material, and is convenient to operate and apply.
Further, the specific preparation method of the polytetrafluoroethylene/styrene-butadiene rubber composite wear-resistant agent comprises the following steps:
(1) Weighing a certain amount of polytetrafluoroethylene emulsion in a beaker, and mechanically stirring at a certain stirring speed;
(2) Weighing styrene-butadiene rubber emulsion according to a certain proportion, slowly adding the styrene-butadiene rubber emulsion into the beaker, and continuously stirring for a certain time;
(3) Stopping stirring, slowly adding saturated saline until solid is separated out, and making the solution transparent;
(4) Cutting the obtained solid into small pieces or granules, and soaking in clear water overnight;
(5) Taking out the soaked solid, and preferably drying in vacuum at 50-60 ℃ to obtain the polytetrafluoroethylene/styrene-butadiene rubber composite solid material.
Wherein, the particle size of the emulsion particles of the polytetrafluoroethylene emulsion can be 0.1-1 mu m, and the solid content is generally 50-65 percent (mass). The solid content of the styrene-butadiene rubber emulsion is 50-65%, for example 60%; the certain proportion is omega (polytetrafluoroethylene emulsion): ω (styrene butadiene rubber emulsion) =1: (1 to 3), preferably 1:2.
according to the embodiment of the invention, the self-lubricity of the polytetrafluoroethylene is utilized, the wear resistance of the EVA foaming material is improved in a composite mode, and the polytetrafluoroethylene with smaller particles can be dispersed in a matrix material in an emulsion mixing mode, so that compared with micro powder filling, the self-lubricity of the EVA foaming material can provide larger specific surface area and increase interaction force, and therefore, the EVA foaming material can be endowed with better wear resistance with smaller filling quantity.
In addition, polytetrafluoroethylene is used as engineering plastic, and can keep good mechanical properties in a wider temperature range, and the compatibility of polytetrafluoroethylene and EVA matrix materials is improved through grafting maleic anhydride and the like by the vinyl polymer, so that the polytetrafluoroethylene plays a certain role in reinforcing the matrix materials, and therefore, the foaming material has good supporting property and compression property. Meanwhile, the introduction of the styrene-butadiene rubber can improve the flexibility and elasticity of the EVA foaming material. In addition, the emulsion mixing mode in the embodiment of the invention is easy to disperse and simple to operate.
The preparation raw materials for preparing the EVA foaming material with high wear resistance and compression resistance comprise the following components in parts by weight: 0.2-1 part of stearic acid; 0.2 to 1 part of zinc stearate; 0.3-2 parts of zinc oxide (ZnO); 2-5 parts of talcum powder.
The embodiment of the invention adopts 0.3 to 1.5 parts of bridging agent1.5 to 5 parts of foaming agent, and the formula material system is crosslinked and foamed to form the EVA foaming material for the shoes with excellent comprehensive performance (for example, the EVA composite foaming material for the shoes with light weight, compression resistance, high wear resistance and extreme foot feeling, or the EVA foaming material with high wear resistance, compression resistance, super comfort feeling, high wear resistance, compression resistance and the like). The bridging agent is also called a cross-linking agent, and is preferably 1, 4-di-tert-butyl diisopropyl benzene peroxide; the blowing agent is preferably azodicarbonamide. The embodiment of the invention is not particularly limited to other auxiliary agents such as a crosslinking agent, a foaming agent, an active agent and the like, and can be used in the common type in the field. In the specific embodiment of the invention, the EVA foaming material for shoes has the hardness of 42-52 ℃, the rebound resilience of over 58 percent and the density of 0.185g/cm 3 And the wear resistance and compression deformation are good.
The embodiment of the invention provides a preparation method of EVA foaming material for shoes, which comprises the following steps:
s1, mixing all the weighed raw materials except for a bridging agent and a foaming agent;
s2, adding the bridging agent and the foaming agent into the materials mixed in the step S1, and mixing;
s3, granulating the mixture obtained in the step S2, and standing and cooling;
and S4, carrying out an IP one-time molding process or an MD (machine direction) secondary molding process on the cooled particles in the step S3 to obtain the EVA foaming material for the high-wear-resistance shoes.
Specifically, the preparation method of the EVA foaming material for the shoes with high wear resistance and compression resistance comprises the following steps:
step 1: weighing the raw materials according to the mass parts of the components in the composition for preparing the EVA foaming material with high wear resistance and compression resistance;
step 2: mixing all the weighed components except the cross-linking agent and the foaming agent;
step 3: adding a weighed cross-linking agent and a foaming agent into the mixed materials, and mixing;
step 4: the resulting mixture was granulated and the resulting granules were left to cool.
In order to make the formula materials used in a wider range, the following steps adopt an IP one-time molding or MD two-time molding process to prepare EVA foaming material soles and test pieces with high wear resistance and compression resistance.
In some embodiments of the invention, the IP one-shot process follows the following steps:
step 5: and (3) injecting the particles in the step (4) through an EVA injection machine, vulcanizing and foaming to obtain the EVA foaming material sole and the test piece with high wear resistance and compression resistance.
In other embodiments of the present invention, the MD overmolding process is followed by the following steps:
step 5: weighing particles in the step 4 according to the mould body, and performing small foaming to obtain a coarse blank;
step 6: and (3) carrying out hot pressing, cooling and shaping on the small foaming rough blank in the step (5) to obtain the EVA foaming material sole and the test piece with high wear resistance and compression resistance.
The preparation process is not particularly limited in the embodiment of the invention; all data of the prepared product can reach the national physical property standard of EVA foaming sole materials, and the EVA foaming sole material is a high wear-resistant and compression-resistant ultra-comfortable EVA foaming material, and has important practical significance for expanding the ground contact EVA foaming sole.
In order to better understand the technical content of the present invention, the following provides specific examples to further illustrate the present invention. In the present invention, unless otherwise specified, the amounts referred to in the present invention are mass percentages.
Example 1
The EVA foaming material with high wear resistance and compression resistance and super comfort comprises the following raw materials in parts by weight:
ethylene-vinyl acetate copolymer: 40 parts;
polyolefin thermoplastic elastomer: 30 parts;
maleic anhydride grafted polyethylene: 10 parts;
wear-resistant agent: 10 parts;
stearic acid: 0.5 parts;
zinc stearate: 1 part;
zinc oxide: 1.5 parts;
talc powder: 4 parts;
and (3) a bridging agent: 0.8 parts;
foaming agent: 2.5 parts;
wherein the ethylene-vinyl acetate copolymer is EVA7470M, which is produced by Taiwan plastic company; polyolefin block copolymer model number infuse9507, manufactured by dow company; the maleic anhydride grafted polyethylene isE588, produced by DuPont; the wear-resistant agent is a polytetrafluoroethylene/styrene-butadiene rubber composite material prepared by an emulsion method; the cross-linking agent is 1, 4-di-tert-butyl diisopropyl benzene peroxide; the foaming agent is azodicarbonamide. The polytetrafluoroethylene emulsion is Japanese Dajinjin D-210C with particle diameter of 0.15-0.35 μm and solid content of 60%; the styrene-butadiene rubber emulsion is provided by Jitian chemical industry, has a solid content of 60% and a viscosity of 1300-2000mPa.s.
The preparation method of the EVA foaming material with high wear resistance and compression deformation resistance and super comfort comprises the following steps of:
(1) Preparation of polytetrafluoroethylene/styrene-butadiene rubber composite material:
1) Weighing 100g of polytetrafluoroethylene emulsion in a beaker, and mechanically stirring at a stirring speed of 2000rpm;
2) 200g of styrene-butadiene rubber emulsion is weighed and slowly added into the beaker in the 1), and stirring is continued for 2 hours;
3) Stopping stirring, slowly adding saturated saline until solid is separated out, and making the solution transparent;
4) Cutting the solid obtained in the step 3) into small pieces, and soaking the small pieces in clear water overnight;
5) Taking out the solid obtained in the step 4), and drying the solid in vacuum at 60 ℃ to obtain the polytetrafluoroethylene/styrene-butadiene rubber composite material wear-resistant agent.
(2) According to the raw material proportion, pouring ethylene-vinyl acetate copolymer, polyolefin elastomer, maleic anhydride grafted polyethylene, the wear-resistant agent, stearic acid, zinc stearate, zinc oxide and talcum powder into an internal mixer for banburying, turning for 4-5 times, and controlling the banburying temperature to 115-120 ℃ for 12-15 minutes;
(3) Adding a bridging agent and a foaming agent into the step (2), and continuously banburying at 110-115 ℃ for about 3-5 minutes;
(4) Conveying the materials uniformly mixed in the open mill in the step (3) into a granulator for granulation, and cooling the granulated particles to room temperature;
(5) Taking particles in the step (4), injecting the particles by an injection molding machine, vulcanizing and foaming, wherein the vulcanizing time is 320-400 seconds, and the vulcanizing temperature is controlled at 178-182 ℃, so as to obtain the EVA foaming material sole and the test piece with high wear resistance and compression resistance and high comfort.
Example 2:
the EVA foaming material with high wear resistance and compression resistance and super comfort comprises the following raw materials in parts by weight:
ethylene-vinyl acetate copolymer: 40 parts;
polyolefin thermoplastic elastomer: 30 parts;
maleic anhydride grafted polyethylene: 10 parts;
wear-resistant agent: 15 parts;
stearic acid: 0.5 parts;
zinc stearate: 1 part;
zinc oxide: 1.6 parts;
talc powder: 4 parts;
and (3) a bridging agent: 1.2 parts;
foaming agent: 3.2 parts;
the ethylene-vinyl acetate copolymer is prepared from EVA7470M and EVA40W, wherein the mass ratio is 2:1, EVA7470M is produced by Taiwan plastic company of China, and EVA40W is produced by DuPont company; polyolefin block copolymer model number of the polyolefin block copolymer is in fuse9107, manufactured by the Dow company; the maleic anhydride grafted polyethylene isE588, produced by DuPont; the antiwear agent is prepared by emulsion methodA polytetrafluoroethylene/styrene-butadiene rubber composite; the cross-linking agent is 1, 4-di-tert-butyl diisopropyl benzene peroxide; the foaming agent is azodicarbonamide.
The preparation method of the EVA foaming material with high wear resistance and compression deformation resistance and super comfort comprises the following steps of:
(1) Preparation of polytetrafluoroethylene/styrene-butadiene rubber composite (preparation of antiwear agent in example is the same as in example 1):
1) Weighing 100g of polytetrafluoroethylene emulsion in a beaker, and mechanically stirring at a stirring speed of 2000rpm;
2) 200g of styrene-butadiene rubber emulsion is weighed and slowly added into the beaker in the 1), and stirring is continued for 2 hours;
3) Stopping stirring, slowly adding saturated saline until solid is separated out, and making the solution transparent;
4) Cutting the solid obtained in the step 3) into small pieces, and soaking the small pieces in clear water overnight;
5) And (3) drying the solid obtained in the step (4) in vacuum at 60 ℃ to obtain the polytetrafluoroethylene/styrene-butadiene rubber composite wear-resistant agent.
(2) According to the raw material proportion, pouring ethylene-vinyl acetate copolymer, polyolefin elastomer, maleic anhydride grafted polyethylene, wear-resisting agent, stearic acid, zinc stearate, zinc oxide and talcum powder into an internal mixer for banburying, turning for 4-5 times, wherein the banburying temperature is controlled at 115-120 ℃ for 12-15 minutes;
(3) Adding a bridging agent and a foaming agent into the step (2), and continuously banburying at 110-115 ℃ for about 3-5 minutes;
(4) Conveying the materials uniformly mixed in the open mill in the step (3) into a granulator for granulation, and cooling the granulated particles to room temperature;
(5) Taking particles in the step (4), injecting the particles by an injection molding machine, vulcanizing and foaming, wherein the vulcanizing time is 320-400 seconds, and the vulcanizing temperature is controlled at 178-182 ℃, so as to obtain the EVA foaming material sole and the test piece with high wear resistance and compression resistance and high comfort.
Comparative example 1:
the comparative example comprises the following raw materials in parts by weight:
ethylene-vinyl acetate copolymer: 40 parts;
polyolefin thermoplastic elastomer: 30 parts;
maleic anhydride grafted polyethylene: 10 parts;
wear-resistant agent: 15 parts;
stearic acid: 0.5 parts;
zinc stearate: 1 part;
zinc oxide: 1.6 parts;
talc powder: 4 parts;
and (3) a bridging agent: 1.2 parts;
foaming agent: 3.2 parts;
the ethylene-vinyl acetate copolymer is prepared from EVA7470M and EVA40W, wherein the mass ratio is 2:1, EVA7470M is produced by Taiwan plastic company of China, and EVA40W is produced by DuPont company; polyolefin block copolymer model number of the polyolefin block copolymer is in fuse9107, manufactured by the Dow company; the maleic anhydride grafted polyethylene isE588, produced by DuPont; the antiwear agent is silicone master batch, the model is CMB1502, and is produced by Sail high polymer material (Shanghai) limited company; the cross-linking agent is odorless bridging agent 1, 4-di-tert-butyl diisopropyl benzene peroxide; the foaming agent is azodicarbonamide.
The preparation method of the EVA foaming material of the comparative example comprises the following steps of:
(1) According to the raw material proportion, pouring ethylene-vinyl acetate copolymer, polyolefin elastomer, maleic anhydride grafted polyethylene, wear-resisting agent, stearic acid, zinc stearate, zinc oxide and talcum powder into an internal mixer for banburying, turning for 4-5 times, wherein the banburying temperature is controlled at 115-120 ℃ for 12-15 minutes;
(2) Adding a bridging agent and a foaming agent into the step (1), and continuously banburying at 110-115 ℃ for about 3-5 minutes;
(3) Conveying the materials uniformly mixed in the open mill in the step (2) into a granulator for granulation, and cooling the granulated particles to room temperature;
(4) And (3) injecting particles in the step (3) through an injection molding machine, vulcanizing and foaming, wherein the vulcanizing time is 320-400 seconds, and the vulcanizing temperature is controlled at 178-182 ℃, so that the EVA foaming material sole and the test piece can be obtained.
TABLE 1 formulation of one-shot forming process examples and comparative examples
Example 3:
the EVA foaming material with high wear resistance and compression resistance and super comfort comprises the following raw materials in parts by weight:
ethylene-vinyl acetate copolymer: 40 parts;
polyolefin thermoplastic elastomer: 30 parts;
maleic anhydride grafted polyethylene: 10 parts;
wear-resistant agent: 10 parts;
stearic acid: 0.5 parts;
zinc stearate: 1 part;
zinc oxide: 1.5 parts;
talc powder: 4 parts;
and (3) a bridging agent: 0.6 parts;
foaming agent: 3.5 parts;
wherein the ethylene-vinyl acetate copolymer is EVA7470M, which is produced by Taiwan plastic company; polyolefin block copolymer model number infuse9507, manufactured by dow company; the maleic anhydride grafted polyethylene isE588, produced by DuPont; the wear-resistant agent is a polytetrafluoroethylene/styrene-butadiene rubber composite material prepared by an emulsion method; the cross-linking agent is 1, 4-di-tert-butyl diisopropyl benzene peroxide; the foaming agent is azodicarbonamide.
The preparation method of the EVA foaming material with high wear resistance and compression deformation resistance and super comfort comprises the following steps of:
(1) Preparation of polytetrafluoroethylene/styrene-butadiene rubber composite material:
1) Weighing 100g of polytetrafluoroethylene emulsion in a beaker, and mechanically stirring at a stirring speed of 2000rpm;
2) 200g of styrene-butadiene rubber emulsion is weighed and slowly added into the beaker in the 1), and stirring is continued for 2 hours;
3) Stopping stirring, slowly adding saturated saline until solid is separated out, and making the solution transparent;
4) Cutting the solid obtained in the step 3) into small pieces, and soaking the small pieces in clear water overnight;
5) And (3) drying the solid obtained in the step (4) in vacuum at 60 ℃ to obtain the polytetrafluoroethylene/styrene-butadiene rubber composite wear-resistant agent.
(2) According to the raw material proportion, pouring ethylene-vinyl acetate copolymer, polyolefin elastomer, maleic anhydride grafted polyethylene, wear-resisting agent, stearic acid, zinc stearate, zinc oxide and talcum powder into an internal mixer for banburying, turning for 4-5 times, wherein the banburying temperature is controlled at 115-120 ℃ for 12-15 minutes;
(3) Adding a bridging agent and a foaming agent into the step (2), and continuously banburying at 110-115 ℃ for about 3-5 minutes;
(4) Conveying the materials uniformly mixed in the open mill in the step (3) into a granulator for granulation, and cooling the granulated particles to room temperature;
(5) And (3) taking the particles in the step (4) to carry out small foaming, wherein the mold temperature is about 155-160 ℃, and the vulcanizing time is about 500-600 seconds, so as to obtain a small foaming coarse embryo.
(6) And (3) carrying out hot pressing, cooling and shaping on the small foaming rough blank in the step (5), wherein the hot pressing temperature is 150 ℃, the hot pressing and cooling and shaping time is 450 seconds, and the EVA foaming material sole and the test piece with high wear resistance and compression resistance and high comfort are obtained.
Example 4:
the EVA foaming material with high wear resistance and compression resistance and super comfort comprises the following raw materials in parts by weight:
ethylene-vinyl acetate copolymer: 40 parts;
polyolefin thermoplastic elastomer: 30 parts;
maleic anhydride grafted polyethylene: 10 parts;
wear-resistant agent: 15 parts;
stearic acid: 0.5 parts;
zinc stearate: 1 part;
zinc oxide: 1.5 parts;
talc powder: 4 parts;
and (3) a bridging agent: 1 part;
foaming agent: 5 parts;
the ethylene-vinyl acetate copolymer is prepared from EVA7470M and EVA40W, wherein the mass ratio is 2:1, EVA7470M is produced by Taiwan plastic company of China, and EVA40W is produced by DuPont company; polyolefin block copolymer model number of the polyolefin block copolymer is in fuse9107, manufactured by the Dow company; the maleic anhydride grafted polyethylene isE588, produced by DuPont; the wear-resistant agent is a polytetrafluoroethylene/styrene-butadiene rubber composite material prepared by an emulsion method; the cross-linking agent is 1, 4-di-tert-butyl diisopropyl benzene peroxide; the foaming agent is azodicarbonamide.
The preparation method of the EVA foaming material with high wear resistance and compression deformation resistance and super comfort comprises the following steps of:
(1) Preparation of polytetrafluoroethylene/styrene-butadiene rubber composite material:
1) Weighing 100g of polytetrafluoroethylene emulsion in a beaker, and mechanically stirring at a stirring speed of 2000rpm;
2) 200g of styrene-butadiene rubber emulsion is weighed and slowly added into the beaker in the 1), and stirring is continued for 2 hours;
3) Stopping stirring, slowly adding saturated saline until solid is separated out, and making the solution transparent;
4) Cutting the solid obtained in the step 3) into small pieces, and soaking the small pieces in clear water overnight;
5) Taking out the solid obtained in the step 4), and drying in vacuum at 60 ℃ to obtain the polytetrafluoroethylene/styrene-butadiene rubber composite material wear-resistant agent.
(2) According to the raw material proportion, pouring ethylene-vinyl acetate copolymer, polyolefin elastomer, maleic anhydride grafted polyethylene, wear-resisting agent, stearic acid, zinc stearate, zinc oxide and talcum powder into an internal mixer for banburying, turning for 4-5 times, wherein the banburying temperature is controlled at 115-120 ℃ for 12-15 minutes;
(3) Adding a bridging agent and a foaming agent into the step (2), and continuously banburying at 110-115 ℃ for about 3-5 minutes;
(4) Conveying the materials uniformly mixed in the open mill in the step (3) into a granulator for granulation, and cooling the granulated particles to room temperature;
(5) And (3) taking the particles in the step (4) to carry out small foaming, wherein the mold temperature is about 155-160 ℃, and the vulcanizing time is about 500-600 seconds, so that the small foaming coarse embryo can be obtained.
(6) And (3) carrying out hot pressing, cooling and shaping on the small foaming rough blank in the step (5), wherein the hot pressing temperature is 150 ℃, the hot pressing and cooling and shaping time is 450 seconds, and the EVA foaming material sole and the test piece with high wear resistance and compression resistance and high comfort are obtained.
Comparative example 2:
the comparative example comprises the following raw materials in parts by weight:
ethylene-vinyl acetate copolymer: 40 parts;
polyolefin thermoplastic elastomer: 30 parts;
maleic anhydride grafted polyethylene: 10 parts;
wear-resistant agent: 15 parts;
stearic acid: 0.5 parts;
zinc stearate: 1 part;
zinc oxide: 1.5 parts;
talc powder: 4 parts;
and (3) a bridging agent: 1 part;
foaming agent: 5 parts;
the ethylene-vinyl acetate copolymer is prepared from EVA7470M and EVA40W, wherein the mass ratio is 2:1, EVA7470M is produced by Taiwan plastic company of China, and EVA40W is produced by DuPont company; polyolefin block copolymer model number of the polyolefin block copolymer is in fuse9107, which is produced by the Dow company; the maleic anhydride grafted polyethylene isE588, produced by DuPont; the antiwear agent is silicone master batch, the model is CMB1502, and is produced by Sail high polymer material (Shanghai) limited company; the cross-linking agent is 1, 4-di-tert-butyl diisopropyl benzene peroxide; the foaming agent is azodicarbonamide.
Comparative example the mixing ratio of the added raw materials was as described above, including the following steps:
(1) According to the raw material proportion, pouring ethylene-vinyl acetate copolymer, polyolefin elastomer, maleic anhydride grafted polyethylene, wear-resisting agent, stearic acid, zinc stearate, zinc oxide and talcum powder into an internal mixer for banburying, turning for 4-5 times, wherein the banburying temperature is controlled at 115-120 ℃ for 12-15 minutes;
(2) Adding a bridging agent and a foaming agent into the step (1), and continuously banburying at 110-115 ℃ for about 3-5 minutes;
(3) Conveying the materials uniformly mixed in the open mill in the step (2) into a granulator for granulation, and cooling the granulated particles to room temperature;
(4) And (3) taking particles in the step (3) to carry out small foaming, wherein the mold temperature is about 155-160 ℃, and the vulcanizing time is about 500-600 seconds, so that the small foaming coarse embryo can be obtained.
(5) And (3) carrying out hot pressing, cooling and shaping on the small foaming rough blank in the step (4), wherein the hot pressing temperature is 150 ℃, and the hot pressing, cooling and shaping time is 450 seconds, so as to obtain the EVA foaming material sole and the test piece.
Table 2: formulation of two-shot molding process examples and comparative examples
The EVA foam materials obtained in examples 1 to 4 and comparative examples 1 to 2 were subjected to physical property test, and the results are shown in Table 3, under the conditions of a temperature of 23.+ -. 3 ℃ and a humidity of 65.+ -. 5%.
Table 3: physical Properties of the EVA foam materials of examples and comparative examples
The wear-resistant agent added in each example is polytetrafluoroethylene/styrene-butadiene rubber composite material, the wear-resistant agent added in the comparative example is common silicone master batch, wherein examples 1-2 and comparative example 1 are in a primary injection process, and examples 3-4 and comparative example 2 are in a secondary mould pressing process. As can be seen from the data in Table 3, the abrasion resistance and compression set of each example are significantly better than those of the comparative examples, and each data of each example can reach the national physical property standard of EVA foam sole materials, wherein examples 2 and 4 can meet the performance requirements of high rebound and light weight.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

Claims (5)

1. The EVA foaming material for the high-wear-resistance shoes is characterized by being prepared by mixing and foaming formula materials, wherein the formula materials consist of the following raw materials in parts by weight:
40-60 parts of ethylene-vinyl acetate copolymer;
20-30 parts of polyolefin elastomer;
5-10 parts of maleic anhydride grafted polyethylene;
10-15 parts of an antiwear agent;
0.2-1 parts of stearic acid;
0.2-1 parts of zinc stearate;
0.3-2 parts of zinc oxide;
2-5 parts of talcum powder;
0.3-1.5 parts of bridging agent;
1.5-5 parts of foaming agent;
the content of vinyl acetate in the ethylene-vinyl acetate copolymer is 18% -40%; the wear-resistant agent is a composite solid material obtained by blending polytetrafluoroethylene emulsion and styrene-butadiene rubber emulsion and physically separating out the emulsion; the particle size of emulsion particles of the polytetrafluoroethylene emulsion is 0.1-1 mu m, and the solid content is 50-65%; the solid content of the styrene-butadiene rubber emulsion is 50-65%, and the mass ratio of the polytetrafluoroethylene emulsion to the styrene-butadiene rubber emulsion is 1: (1-3); the bridging agent is 1, 4-di-tert-butyl diisopropyl benzene peroxide; the foaming agent is azodicarbonamide; the hardness of the EVA foaming material for the shoes is 42-52C.
2. The EVA foam for shoes according to claim 1, wherein the wear-resistant agent is obtained in the following specific manner: mixing polytetrafluoroethylene emulsion and styrene-butadiene rubber emulsion under stirring, continuing stirring for a certain time, adding saturated saline until solid is separated out, crushing the obtained solid, placing the crushed solid into clear water, soaking for at least 12 hours, and vacuum drying to obtain the polytetrafluoroethylene and styrene-butadiene rubber composite solid material.
3. The method for producing EVA foam for shoes according to any one of claims 1 to 2, comprising the steps of:
s1, mixing all raw materials except for a bridging agent and a foaming agent in the raw materials of the weighed formula;
s2, adding the bridging agent and the foaming agent into the materials mixed in the step S1, and mixing;
s3, granulating the mixture obtained in the step S2, and standing and cooling;
and S4, carrying out an IP one-time molding process or an MD (machine direction) secondary molding process on the cooled particles in the step S3 to obtain the EVA foaming material for the high-wear-resistance shoes.
4. The method according to claim 3, wherein the IP one-shot forming process comprises: and (3) injecting the particles cooled in the step (S3) through an EVA injection machine, and vulcanizing and foaming to obtain the EVA foaming material for the shoes.
5. The method according to claim 3, wherein the MD secondary molding process specifically comprises: weighing the cooled particles in the step S3 according to the mold body, and performing small foaming; and (3) performing hot pressing, cooling and shaping on the coarse embryo obtained by the small foaming to obtain the EVA foaming material for the shoes.
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