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CN-121736402-B - Foaming sole material and preparation method thereof

CN121736402BCN 121736402 BCN121736402 BCN 121736402BCN-121736402-B

Abstract

The invention provides a foaming sole material, which is a dynamic fatigue-resistant foaming sole material with low thickness change rate. The invention also provides application of the vinyl-acrylic ester nanofiber in preparing a foaming sole material. The invention firstly designs a modified thermoplastic polyurethane elastomer which is a rigid cross-linked network copolymer with strong polarity and stable structure, then uses the copolymer as a reinforced framework to inhibit cell collapse, improves the compressive creep resistance, further forms a three-dimensional support network by compounding with EVA, polyolefin elastomer, vinyl-acrylic ester nanofiber and compatilizer, and prepares the light high-elasticity sole material through a foaming process. The invention has excellent dynamic durability, the thickness change rate is less than or equal to 10% under the dynamic compression condition, and the rebound rate/energy regression rate/shock absorption G value change before and after fatigue is less than 9%, so that the invention can meet the comprehensive performance requirements of the high-strength sports shoes on light weight, high rebound and long-term deformation stability.

Inventors

  • LEI SHIYUAN
  • Ding shijia

Assignees

  • 安踏（中国）有限公司

Dates

Publication Date
20260508
Application Date
20260302

Claims (10)

  1. 1. Application of vinyl-acrylic ester nanofiber and maleic anhydride grafted EVA compatilizer in preparing foaming sole material; The application includes the application of reducing the thickness change rate of the foam sole during use.
  2. 2. The use according to claim 1, wherein the foamed sole material comprises an EVA-based foamed sole material; the diameter of the vinyl-acrylic ester nanofiber is 50-100 nm; the vinyl-acrylic ester nanofiber is used in the preparation of the foaming sole material in an amount of 3-7 parts by weight.
  3. 3. The use according to claim 1, characterized in that the maleic anhydride grafted EVA compatibiliser is used in the preparation of foamed sole material in an amount of 2-5 parts by weight; the raw materials for preparing the foaming sole material also comprise a matrix material; the matrix material is EVA, polyolefin elastomer and modified thermoplastic polyurethane elastomer; The applications also include applications in one or more of forming a three-dimensional support network structure of a polymer in a foam sole, enhancing cell stability, and enhancing cell uniformity.
  4. 4. The foaming sole material is characterized by comprising, by weight, 40-60 parts of EVA, 20-40 parts of a polyolefin elastomer, 10-30 parts of a modified thermoplastic polyurethane elastomer, 3-7 parts of vinyl-acrylate nanofiber, 2-5 parts of a maleic anhydride grafted EVA compatilizer, 0.4-0.8 part of a peroxide cross-linking agent, 0-4 parts of an AC foaming agent, 0-1.5 parts of zinc oxide and 1-1.5 parts of stearic acid.
  5. 5. The foam sole material according to claim 4, wherein the VA mass content in the EVA is 15% -40%; The polyolefin elastomer comprises one or more of ethylene-octene random polymer POE, ethylene-octene block polymer OBC and ethylene-propylene-conjugated diene EPDM; the modified thermoplastic polyurethane elastomer comprises a carboxyl-containing acrylic rubber modified thermoplastic polyurethane elastomer; The thermoplastic polyurethane elastomer in the modified thermoplastic polyurethane elastomer comprises one or more of aliphatic polyester TPU, aliphatic polyether TPU, aromatic polyester TPU, aromatic polyether TPU, polycaprolactone type polyester TPU and polycarbonate type polyester TPU; The maleic anhydride grafted EVA compatilizer comprises maleic anhydride grafted EVA compatilizer with the grafting rate of more than or equal to 1.0 percent; The peroxide crosslinking agent comprises dicumyl peroxide and/or 1, 4-di-tert-butyl peroxyisopropyl benzene; The AC blowing agent comprises one or more of azodicarbonamide, sodium bicarbonate, expanded microspheres, 4-oxo-diphenyl sulfonyl hydrazine, supercritical nitrogen, and supercritical carbon dioxide.
  6. 6. The foaming sole material according to claim 4, wherein the modified thermoplastic polyurethane elastomer comprises, by weight, 70-80 parts of thermoplastic polyurethane elastomer, 20-30 parts of strong-polarity carboxyl-containing acrylate vinyl rubber, 0.5-2 parts of grafting agent, 0.5-1 part of initiator and 0.3-1 part of lubricant; the strongly polar carboxyl group-containing acrylate-based vinyl rubber includes ACM 2012; the grafting agent comprises one or more of maleic anhydride, acrylic acid and methacrylic acid; the initiator comprises one or more of azodiisobutyronitrile, benzoyl peroxide and ethane peroxide; The lubricant comprises stearic acid and/or zinc stearate; the thermoplastic polyurethane elastomer and the carboxyl-containing acrylic vinyl rubber form a rigid cross-linked network blend with strong polarity and stable structure after being heated and melted.
  7. 7. The preparation method of the foaming sole material is characterized by comprising the following steps of: 1) Taking a peroxide cross-linking agent, an AC foaming agent and zinc oxide as a first group of raw materials, taking vinyl-acrylic ester nanofiber, stearic acid and maleic anhydride grafted EVA compatilizer as a second group of raw materials, and taking the rest raw materials as a third group of raw materials; Adding a third group of raw materials into an internal mixer for heating and mixing, adding a second group of raw materials for continuously heating and mixing after the temperature reaches a first temperature, adding the first group of raw materials for continuously heating and mixing after the temperature reaches a second temperature, obtaining a mixture, and granulating the obtained mixture to obtain granules; 2) The granules obtained in the steps are subjected to small foaming to obtain a semi-finished product, and then the semi-finished product is subjected to mould pressing to obtain a foaming sole material, or the granules obtained in the steps are subjected to injection foaming molding to obtain a foaming material, and then the foaming sole material is obtained through baking; Or alternatively 1') Taking a peroxide crosslinking agent as a first group of raw materials, taking vinyl-acrylic ester nanofiber, stearic acid and maleic anhydride grafted EVA compatilizer as a second group of raw materials, and taking the rest raw materials as a third group of raw materials, wherein the raw materials do not contain AC foaming agent and zinc oxide; Adding a third group of raw materials into an internal mixer for heating and mixing, adding a second group of raw materials for continuously heating and mixing after the temperature reaches a first temperature, adding the first group of raw materials for continuously heating and mixing after the temperature reaches a second temperature, obtaining a mixture, and granulating the obtained mixture to obtain granules; 2') carrying out IP injection molding on the granules obtained in the step to obtain small rough blanks, carrying out supercritical foaming on the small rough blanks, cooling to obtain semi-finished products, and carrying out finished product mould pressing to obtain the foaming sole material.
  8. 8. The method according to claim 7, wherein the first temperature is 100 to 110 ℃; the second temperature is 110-120 ℃; the third temperature is 120-125 ℃; the granulating temperature is 100-130 ℃; The temperature of the small foaming is 170-180 ℃; The time of the small foaming is 500-560 seconds; The temperature of the die pressing is 170-180 ℃; the molding time is 400-460 seconds.
  9. 9. The method according to claim 7, wherein the injection foaming is performed at a feeding temperature of 105-120 ℃; the temperature of the forming die for injection foaming forming is 170-180 ℃; the injection time of the injection foaming molding is 180-220 seconds; The vulcanization foaming time of the injection foaming molding is 570-630 seconds; the baking temperature is 80-100 ℃; the rotating speed of the baking oven is 50-60 revolutions per minute; The baking time is 30-40 minutes.
  10. 10. The method according to claim 7, wherein the molding temperature of the IP injection molding is 170 to 180 ℃; the injection time of the IP injection molding is 180-220 seconds; the vulcanization time of the IP injection molding is 470-530 seconds; The pressure of the supercritical foaming is 18-35 MPa; the temperature of the supercritical foaming is 115-150 ℃; The heat preservation and pressure maintaining time of the supercritical foaming is 1.5-2.5 h; The heating temperature of the finished product die pressing is 160-170 ℃; the heating time of the finished product mould pressing is 470-530 seconds; the cooling temperature of the finished product die pressing is 20-25 ℃; and the cooling time of the finished product mould pressing is 470-530 seconds.

Description

Foaming sole material and preparation method thereof Technical Field The invention belongs to the technical field of foaming sole materials, relates to application of vinyl-acrylic ester nanofibers in preparing a foaming sole material, a foaming sole material and a preparation method thereof, and particularly relates to a dynamic fatigue-resistant foaming sole material with low thickness change rate and a preparation method thereof. Background With the rapid development of the sports shoe market, the wearing experience requirements and the appearance requirements of people on the soles and other parts are higher and higher. Consumers often require shoes that are not only lightweight and comfortable to wear, but also have a cool, fashionable appearance, and therefore, performance requirements for sole materials are increasing. Among them, softness, comfort and weight reduction are major trends. Some corresponding technical research schemes are also disclosed in the prior art, such as patent 201611026985.0 discloses a low compression deformation foaming sole and a preparation method thereof. The prepared low compression deformation foaming sole has the compression deformation less than 20% under the conditions of 50 ℃ temperature, 50% compression ratio and 6 hours static compression time, but has the density of 0.20-0.23g/cm 3, the hardness of 54-57 ℃ and the rebound rate of 52-57%. Patent 202310033499.5 discloses a compression-resistant composite foam material, a preparation method thereof and a sole. By adopting the combination of the modified styrene-ethylene-butylene-styrene block copolymer and the ethylene-vinyl acetate copolymer, the modified styrene-ethylene-butylene-styrene block copolymer has excellent compression deformation resistance, so that the composite foaming material is more suitable for secondary foaming, the demand on the coupling agent is greatly reduced, and the compression deformation rate can be reduced by 20% -50% while the physical properties such as rebound resilience, softness and the like are unchanged. Patent 202311706559.1 provides a compression-resistant master batch and a preparation method thereof, and a low-compression-deformation foaming material and a preparation method thereof. Patent 202010738380.4 provides an extremely light wear-resistant low-compression high-resilience composite foam material for sports soles. Although the composite foaming material has lower density, and has excellent wear resistance, rebound and compression resistance. However, the invention still has room for further improvement in terms of wear resistance and rebound resilience of the material. However, the soft and light elastic material is easy to collapse after being worn for a long time, and the sole gradually loses elasticity, so that the cushioning performance is poor, and the wearing experience and the appearance structure of the shoe are seriously affected. Particularly in a high-strength sports scene, the soft and light foam sole can be stressed under dynamic movement to generate larger deformation, and the requirement of high-strength sports can not be met. For high-strength sports scenes, a material capable of effectively reducing the thickness change rate of the foaming sole under dynamic fatigue is needed to improve the durability and safety of shoes. In addition, the fatigue resistance of the foaming sole is generally embodied by compression deformation in the current industry, the compression deformation test standard is a static compression deformation test method, and the compression deformation test standard is the compression deformation rate under the conditions of 50 ℃ temperature, 50% compression ratio and 6 hours static compression time. The static compression deformation obtained based on the static state test can only be used for explaining the compression deformation performance of the product in the static state, and consumers often need to run or walk when wearing sports shoes, so the magnitude of the static compression deformation value obtained by adopting the static compression deformation test method is not practically suitable for explaining the fatigue resistance performance of the shoes. Therefore, how to develop and design a more suitable foam sole material for sports shoes, which solves the above technical problems existing in the prior foam sole materials, has become one of the problems to be solved by many first-line researchers in the industry, and has very important value especially for long-distance sports. Disclosure of Invention In view of the above, the technical problem to be solved by the present invention is to provide an application of vinyl-acrylate nanofiber in preparing a foaming sole material, a foaming sole material and a preparation method thereof, in particular a dynamic fatigue-resistant foaming sole material with low thickness change rate. By innovating the material formula and the preparation process, the prepared sole material has excelle