Light-transmitting foaming shoe sole composition, air cushion shoe sole and preparation method of air cushion shoe sole

Abstract

The invention relates to the technical field of foamed shoe soles, in particular to a light-transmitting foamed shoe sole composition, an air cushion shoe sole and a preparation method thereof.The light-transmitting foamed shoe sole composition is prepared from thermoplastic polyurethane, a foaming agent, an improved auxiliary, wear-resistant rubber and toughening plastics, the thermoplastic polyurethane is transparent, the transparency of the thermoplastic polyurethane is not lower than 90%, and the foaming agent is a polyurethane foaming agent. The thermoplastic polyurethane is prepared from the following components in parts by weight: 42 to 56 parts of thermoplastic polyurethane, 4 to 9 parts of a foaming agent, 7 to 12 parts of an improved auxiliary agent, 18 to 26 parts of wear-resistant rubber and 22 to 27 parts of toughened plastic, and the thermoplastic polyurethane is prepared from polyethylene glycol terephthalate and polybutylene adipate; according to the invention, excellent light transmission and light weight of the sole are realized, the durability and toughness of the sole are greatly improved, the forming quality and performance of the sole are ensured, the buffering and comfort level of the sole are enhanced, and diversified design requirements are met.

Description

Technical Field

[0001] The invention relates to the technical field of foamed soles, in particular to a light-transmitting foamed sole composition, an air cushion sole and a preparation method thereof. Background Art

[0002] Air-cushioned soles made from a translucent foamed sole composition are an innovative sole technology that combines the advantages of translucent foam materials and air-cushion technology. This sole is made using a special process in which translucent foam materials are injection-molded in a high-pressure mold, and the interior is filled with air to form a unique shock-absorbing structure. This structure not only makes the sole light, soft and comfortable, but also greatly enhances its wear resistance and shock absorption properties. The design of the air-cushioned portion enables the sole to quickly deform and absorb impact when under pressure, effectively protecting the wearer's foot joints and bones. At the same time, the use of translucent foam materials gives the sole a unique luster and texture when exposed to light, increasing the shoe's sense of style and aesthetic appeal. Air-cushioned soles made from a translucent foamed sole composition are a sole technology that combines comfort, shock absorption, wear resistance, and fashion, and are deeply loved by sports enthusiasts and fashionistas. For example, Publication No. (CN107501713B) discloses a light-transmitting foamed sole composition and a method for producing soles using the composition. The composition comprises the following raw materials: magnesium carbonate, a white foaming agent, di-tert-butyl dicumyl peroxide, 2,6-di-tert-butyl-4-methylphenol or dibutylhydroxytoluene, transparent zinc oxide, stearic acid, trimethylolpropane triacrylate, a silane coupling agent, ethylene-vinyl acetate copolymer, an olefin block copolymer, an ethylene-styrene-butadiene triblock copolymer, and EPDM rubber. The magnesium carbonate is in powder form with a particle size of 40-80 mesh. Through the comprehensive selection of the composition and process, the present invention produces a light-transmitting sole that meets the requirements for physical parameters such as elasticity, yellowing resistance, and compression deformation.

[0003] However, during the production process of existing translucent foamed soles, bubbles exist in the foam material, and the bubbles scatter and reflect light, which easily causes poor light transmittance. In addition, in order to enhance the wear resistance of the soles, higher density materials are used for production, which is not lightweight enough, and has poor durability and toughness, affecting the quality, performance and comfort of the soles, and there are certain disadvantages during use.

[0004] In view of this, the present invention is proposed. Summary of the Invention

[0005] In order to overcome the technical defects of the existing technology, the present invention provides a translucent foam sole composition, an air cushion sole and a preparation method thereof, which achieves excellent light transmittance and lightweight of the sole, greatly improves the durability and toughness of the sole, ensures the molding quality and performance of the sole, and enhances the cushioning and comfort of the sole to meet diverse design requirements.

[0006] The technical solution adopted by the present invention is: its materials include thermoplastic polyurethane, foaming agent, improved auxiliary agent, wear-resistant rubber and toughened plastic, the thermoplastic polyurethane is transparent, the transparency of the thermoplastic polyurethane is not less than 90%, and the thermoplastic polyurethane is 42-56 parts by weight, the foaming agent is 4-9 parts, the improved auxiliary agent is 7-12 parts, the wear-resistant rubber is 18-26 parts and the toughened plastic is 22-27 parts.

[0007] Preferably, in order to optimize the physical properties of the thermoplastic polyurethane and improve the elasticity and strength of the sole composition, the thermoplastic polyurethane includes polyethylene terephthalate and polybutylene adipate, and the ratio of polyethylene terephthalate and polybutylene adipate in the thermoplastic polyurethane is 2:1.

[0008] Preferably, in order to provide an efficient and environmentally friendly foaming effect while ensuring the transparency and physical properties of the sole, the foaming agent is a mixture of a BSH formamide-free foaming agent and a transparent PVC sole foaming agent, and the ratio of the BSH formamide-free foaming agent to the transparent PVC sole foaming agent is 1:1.

[0009] Preferably, in order to improve the durability, anti-aging performance and UV protection ability of the composition and extend the service life of the sole, the improved auxiliary agent includes an antioxidant, an anti-ultraviolet agent and an antioxidant, and the antioxidant, the anti-ultraviolet agent and the antioxidant account for 60%-72%, 15%-21% and 7%-13% respectively.

[0010] Preferably, in order to improve the wear resistance and toughness of the sole, the wear-resistant rubber is composed of ethylene-vinyl acetate copolymer and natural rubber, and the ethylene-vinyl acetate copolymer and the natural rubber account for 73%-82% and 15%-22% of the wear-resistant rubber respectively; the toughening plastic is composed of olefin block copolymer and polyolefin elastomer, and the olefin block copolymer and the polyolefin elastomer account for 42%-53% and 46%-55% of the toughening plastic.

[0011] Preferably, in order to ensure the light transmittance and aesthetics of the sole while providing good shock-absorbing performance, an air cushion sole made of a light-transmitting foamed sole composition is provided, which is processed from the light-transmitting foamed sole composition. An air cushion chamber is provided at the bottom of the sole, and the air cushion chamber is filled with gas or transparent gel. The shape, size and position of the air cushion chamber are configured according to the design and functional requirements of the sole.

[0012] Preferably, a method for making a sole from a light-transmitting foamed sole composition comprises: uniformly mixing the thermoplastic polyurethane, the foaming agent, the improved auxiliary agent, the wear-resistant rubber and the toughening plastic in the light-transmitting foamed sole composition and injecting the mixture into a mold; heating and applying pressure to the mold to foam the composition and form the shape of a sole; cooling the mold and taking out the formed sole, wherein the heating temperature of the mold is 120°C-145°C and the pressure applied to the mold is 75MPa-100MPa.

[0013] Preferably, in order to remove bubbles in the composition and preheat it, ensure that the composition is evenly mixed and easy to foam, thereby improving the light transmittance, wear resistance and toughness of the sole, the thermoplastic polyurethane, the foaming agent, the improved auxiliary agent, the wear-resistant rubber and the toughening plastic in the light-transmitting foaming sole composition are degassed and heated before being injected into the mold.

[0014] The beneficial effects of the present invention are: using high-transparency thermoplastic polyurethane as the main component, combined with specific foaming agents and improved additives, the excellent light transmittance and lightweight of the sole are achieved; the addition of wear-resistant rubber and toughening plastic greatly improves the durability and toughness of the sole; the production method is simple and efficient, and the quality and performance of the sole molding are ensured by precisely controlling the heating temperature and pressure. The design of the air cushion chamber further enhances the cushioning and comfort of the sole, meeting diverse design requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the sole processing process of the present invention.

[0016] Figure 2 The following is a comparison table of test results of the embodiments of the present invention and the comparative examples. DETAILED DESCRIPTION

[0017] The present invention will be further described below in conjunction with the accompanying drawings: Example 1

[0018] like Figure 1-Figure 2 As shown, this embodiment provides a translucent foamed sole composition, an air cushion sole and a preparation method thereof, wherein the materials include thermoplastic polyurethane, a foaming agent, an improved auxiliary agent, wear-resistant rubber and toughened plastic. The thermoplastic polyurethane is transparent, and the transparency of the thermoplastic polyurethane is not less than 90%. In terms of weight, the thermoplastic polyurethane is 42 parts, the foaming agent is 4 parts, the improved auxiliary agent is 7 parts, the wear-resistant rubber is 18 parts and the toughened plastic is 22 parts.

[0019] Thermoplastic polyurethane includes polyethylene terephthalate and polybutylene adipate, and the ratio of polyethylene terephthalate and polybutylene adipate in thermoplastic polyurethane is 2:1. The foaming agent is a mixture of BSH formamide-free foaming agent and transparent PVC sole foaming agent, and the ratio of BSH formamide-free foaming agent and transparent PVC sole foaming agent is 1:1. The chemical composition of BSH formamide-free foaming agent is benzenesulfonyl hydrazide (Benzenesulfonyl BSH (formamide-free foaming agent) is a derivative of hydrazide (molecular formula: C6H6N2O2S). The N2 gas released by the formamide-free foaming agent has a low molecular weight and slow diffusion, forming fine closed cells (≤25μm) and reducing light scattering. In contrast, the AC foaming agent produces CO2, which leads to large bubbles (>50μm) and reduces light transmittance by more than 15%. The transparent PVC sole foaming agent is a zinc-based complex (ZnO·organic zinc salt) and does not contain lead or cadmium. When BSH is used alone, the foam density deviation is >15%, but with the addition of a zinc-based foaming agent, the density deviation is reduced to <5% (ISO 845), ensuring uniform light transmittance of the sole. Improved additives include antioxidants, UV inhibitors, and antioxidants, accounting for 60%, 15%, and 7%, respectively. The antioxidant is a hindered phenol (e.g., pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, brand Irganox). 1010), the UV antioxidant is a benzotriazole (such as 2-(2H-benzotriazole-2-yl)-4,6-di-tert-amylphenol, brand Tinuvin 328), the mechanism of action is to absorb 300-400nm ultraviolet light to prevent TPU yellowing, the limited type of antioxidant is 2,2'-thiobis(4-methyl-6-tert-butylphenol) (brand Antioxidant 2246), and its molecular weight is limited to ≤500 Da to ensure compatibility with TPU and avoid phase separation. The wear-resistant rubber is composed of ethylene-vinyl acetate copolymer and natural rubber, and the proportion of ethylene-vinyl acetate copolymer and natural rubber in the wear-resistant rubber is 73% and 15% respectively. The toughened plastic is composed of olefin block copolymer and polyolefin elastomer, and the proportion of olefin block copolymer and polyolefin elastomer in the toughened plastic is 42% and 46% respectively.

[0020] The air cushion sole is made of a translucent foamed sole composition. An air cushion chamber is provided at the bottom of the sole. The air cushion chamber is filled with gas or transparent gel. The shape, size and position of the air cushion chamber are configured according to the design and functional requirements of the sole.

[0021] The method for making a sole using a light-transmitting foamed sole composition comprises: uniformly mixing thermoplastic polyurethane, a foaming agent, an improved auxiliary agent, wear-resistant rubber and a toughening plastic in the light-transmitting foamed sole composition, and then injecting the mixture into a mold; heating and applying pressure to the mold to foam the composition and form a sole shape; cooling the mold and taking out the molded sole, wherein the heating temperature of the mold is 120° C. and the pressure applied to the mold is 75 MPa. Before injecting the thermoplastic polyurethane, the foaming agent, the improved auxiliary agent, wear-resistant rubber and the toughening plastic in the light-transmitting foamed sole composition into the mold, the mixture is degassed and heated. The molded sole is tested and has good light transmittance and lightweight effects, as well as high wear resistance and toughness. Example 2

[0022] like Figure 1-Figure 2 As shown, this embodiment provides a translucent foamed sole composition, an air cushion sole and a preparation method thereof, wherein the materials include thermoplastic polyurethane, a foaming agent, an improved auxiliary agent, wear-resistant rubber and toughened plastic. The thermoplastic polyurethane is transparent, and the transparency of the thermoplastic polyurethane is not less than 90%. In terms of weight, the thermoplastic polyurethane is 41 parts, the foaming agent is 6 parts, the improved auxiliary agent is 9 parts, the wear-resistant rubber is 19 parts and the toughened plastic is 23 parts.

[0023] Thermoplastic polyurethane includes polyethylene terephthalate and polybutylene adipate, and the proportion of polyethylene terephthalate and polybutylene adipate in the thermoplastic polyurethane is 2:1. The foaming agent is a mixture of BSH formamide-free foaming agent and transparent PVC sole foaming agent, and the proportion of BSH formamide-free foaming agent and transparent PVC sole foaming agent is 1:1. Improved additives include antioxidants, UV inhibitors and anti-aging agents, and the antioxidants, UV inhibitors and anti-aging agents account for 62%, 18% and 9% respectively. The wear-resistant rubber is composed of ethylene-vinyl acetate copolymer and natural rubber, and the proportion of ethylene-vinyl acetate copolymer and natural rubber in the wear-resistant rubber is 76% and 18% respectively. The toughened plastic is composed of olefin block copolymer and polyolefin elastomer, and the proportion of olefin block copolymer and polyolefin elastomer in the toughened plastic is 43% and 47%.

[0024] The air cushion sole is made of a translucent foamed sole composition. An air cushion chamber is provided at the bottom of the sole. The air cushion chamber is filled with gas or transparent gel. The shape, size and position of the air cushion chamber are configured according to the design and functional requirements of the sole.

[0025] The method for making a sole using a light-transmitting foamed sole composition comprises: uniformly mixing thermoplastic polyurethane, a foaming agent, an improved auxiliary agent, wear-resistant rubber and a toughening plastic in the light-transmitting foamed sole composition, and then injecting the mixture into a mold; heating and applying pressure to the mold to foam the composition and form a sole shape; cooling the mold and taking out the molded sole, wherein the heating temperature of the mold is 126° C. and the pressure applied to the mold is 78 MPa. Before injecting the thermoplastic polyurethane, the foaming agent, the improved auxiliary agent, wear-resistant rubber and the toughening plastic in the light-transmitting foamed sole composition into the mold, the mixture is degassed and heated. The molded sole is tested and has good light transmittance and lightweight effects, as well as high wear resistance and toughness. Implementation Three

[0026] like Figure 1-Figure 2 As shown in sa, this embodiment provides a translucent foamed sole composition, an air cushion sole and a preparation method thereof, wherein the materials include thermoplastic polyurethane, a foaming agent, an improved auxiliary agent, wear-resistant rubber and toughened plastic. The thermoplastic polyurethane is transparent, and the transparency of the thermoplastic polyurethane is not less than 90%. In terms of weight, the thermoplastic polyurethane is 48 parts, the foaming agent is 8 parts, the improved auxiliary agent is 10 parts, the wear-resistant rubber is 23 parts and the toughened plastic is 24 parts.

[0027] Thermoplastic polyurethane includes polyethylene terephthalate and polybutylene adipate, and the proportion of polyethylene terephthalate and polybutylene adipate in the thermoplastic polyurethane is 2:1. The foaming agent is a mixture of BSH formamide-free foaming agent and transparent PVC sole foaming agent, and the proportion of BSH formamide-free foaming agent and transparent PVC sole foaming agent is 1:1. Improved additives include antioxidants, UV inhibitors and anti-aging agents, and the antioxidants, UV inhibitors and anti-aging agents account for 63%, 19% and 10% respectively. The wear-resistant rubber is composed of ethylene-vinyl acetate copolymer and natural rubber, and the proportion of ethylene-vinyl acetate copolymer and natural rubber in the wear-resistant rubber is 78% and 19% respectively. The toughened plastic is composed of olefin block copolymer and polyolefin elastomer, and the proportion of olefin block copolymer and polyolefin elastomer in the toughened plastic is 48% and 52%.

[0028] The air cushion sole is made of a translucent foamed sole composition. An air cushion chamber is provided at the bottom of the sole. The air cushion chamber is filled with gas or transparent gel. The shape, size and position of the air cushion chamber are configured according to the design and functional requirements of the sole.

[0029] The method for making a sole using a light-transmitting foamed sole composition comprises: uniformly mixing thermoplastic polyurethane, a foaming agent, an improved auxiliary agent, wear-resistant rubber and a toughening plastic in the light-transmitting foamed sole composition, and then injecting the mixture into a mold; heating and applying pressure to the mold to foam the composition and form the shape of a sole; cooling the mold and taking out the molded sole, wherein the heating temperature of the mold is 130° C. and the pressure applied to the mold is 82 MPa. Before injecting the thermoplastic polyurethane, the foaming agent, the improved auxiliary agent, wear-resistant rubber and the toughening plastic in the light-transmitting foamed sole composition into the mold, the mixture is degassed and heated. The molded sole is tested and has good light transmittance and lightweight effects, as well as high wear resistance and toughness. Example 4

[0030] like Figure 1-Figure 2 As shown, this embodiment provides a translucent foamed sole composition, an air cushion sole and a preparation method thereof, wherein the materials include thermoplastic polyurethane, a foaming agent, an improved auxiliary agent, wear-resistant rubber and toughened plastic. The thermoplastic polyurethane is transparent, and the transparency of the thermoplastic polyurethane is not less than 90%. In terms of weight, the thermoplastic polyurethane is 54 parts, the foaming agent is 8 parts, the improved auxiliary agent is 11 parts, the wear-resistant rubber is 25 parts and the toughened plastic is 26 parts.

[0031] Thermoplastic polyurethane includes polyethylene terephthalate and polybutylene adipate, and the proportion of polyethylene terephthalate and polybutylene adipate in the thermoplastic polyurethane is 2:1. The foaming agent is a mixture of BSH formamide-free foaming agent and transparent PVC sole foaming agent, and the proportion of BSH formamide-free foaming agent and transparent PVC sole foaming agent is 1:1. Improved additives include antioxidants, UV inhibitors and anti-aging agents, and the antioxidants, UV inhibitors and anti-aging agents account for 68%, 20% and 12% respectively. The wear-resistant rubber is composed of ethylene-vinyl acetate copolymer and natural rubber, and the proportion of ethylene-vinyl acetate copolymer and natural rubber in the wear-resistant rubber is 81% and 21% respectively. The toughened plastic is composed of olefin block copolymer and polyolefin elastomer, and the proportion of olefin block copolymer and polyolefin elastomer in the toughened plastic is 51% and 54%.

[0032] The air cushion sole is made of a translucent foamed sole composition. An air cushion chamber is provided at the bottom of the sole. The air cushion chamber is filled with gas or transparent gel. The shape, size and position of the air cushion chamber are configured according to the design and functional requirements of the sole.

[0033] The method for making a sole using a light-transmitting foamed sole composition comprises: uniformly mixing thermoplastic polyurethane, a foaming agent, an improved auxiliary agent, wear-resistant rubber and a toughening plastic in the light-transmitting foamed sole composition, and then injecting the mixture into a mold; heating and applying pressure to the mold to foam the composition and form the shape of a sole; cooling the mold and taking out the molded sole, wherein the heating temperature of the mold is 142° C. and the pressure applied to the mold is 93 MPa. Before injecting the thermoplastic polyurethane, the foaming agent, the improved auxiliary agent, wear-resistant rubber and the toughening plastic in the light-transmitting foamed sole composition into the mold, the mixture is degassed and heated. The molded sole is tested and has good light transmittance and lightweight effects, as well as high wear resistance and toughness. Example 5

[0034] like Figure 1-Figure 2 As shown, this embodiment provides a translucent foamed sole composition, an air cushion sole and a preparation method thereof, wherein the materials include thermoplastic polyurethane, a foaming agent, an improved auxiliary agent, wear-resistant rubber and toughened plastic. The thermoplastic polyurethane is transparent, and the transparency of the thermoplastic polyurethane is not less than 90%. In terms of weight, the thermoplastic polyurethane is 56 parts, the foaming agent is 9 parts, the improved auxiliary agent is 12 parts, the wear-resistant rubber is 26 parts and the toughened plastic is 27 parts.

[0035] Thermoplastic polyurethane includes polyethylene terephthalate and polybutylene adipate, and the proportion of polyethylene terephthalate and polybutylene adipate in the thermoplastic polyurethane is 2:1. The foaming agent is a mixture of BSH formamide-free foaming agent and transparent PVC sole foaming agent, and the proportion of BSH formamide-free foaming agent and transparent PVC sole foaming agent is 1:1. Improved additives include antioxidants, UV inhibitors and anti-aging agents, and the antioxidants, UV inhibitors and anti-aging agents account for 72%, 21% and 13% respectively. The wear-resistant rubber is composed of ethylene-vinyl acetate copolymer and natural rubber, and the proportion of ethylene-vinyl acetate copolymer and natural rubber in the wear-resistant rubber is 82% and 22% respectively. The toughened plastic is composed of olefin block copolymer and polyolefin elastomer, and the proportion of olefin block copolymer and polyolefin elastomer in the toughened plastic is 53% and 55%.

[0036] The air cushion sole is made of a translucent foamed sole composition. An air cushion chamber is provided at the bottom of the sole. The air cushion chamber is filled with gas or transparent gel. The shape, size and position of the air cushion chamber are configured according to the design and functional requirements of the sole.

[0037] The method for making a sole from a light-transmitting foamed sole composition comprises: uniformly mixing thermoplastic polyurethane, a foaming agent, an improved auxiliary agent, wear-resistant rubber and a toughening plastic in the light-transmitting foamed sole composition, and then injecting the mixture into a mold; heating and applying pressure to the mold to foam the composition and form the shape of a sole; cooling the mold and taking out the molded sole, wherein the heating temperature of the mold is 145° C. and the pressure applied to the mold is 100 MPa. Before injecting the thermoplastic polyurethane, the foaming agent, the improved auxiliary agent, wear-resistant rubber and the toughening plastic in the light-transmitting foamed sole composition into the mold, the mixture is degassed and heated. The molded sole is tested and has good light transmittance and lightweight effects, as well as high wear resistance and toughness. Comparative Example 1

[0038] like Figure 1-Figure 2 As shown, this comparative example provides a translucent foamed sole composition, an air cushion sole and a preparation method thereof, wherein the materials include thermoplastic polyurethane, a foaming agent, an improved auxiliary agent, wear-resistant rubber and a toughening plastic. The thermoplastic polyurethane is transparent, and the transparency of the thermoplastic polyurethane is not less than 90%. In terms of weight, the thermoplastic polyurethane is 38 parts, the foaming agent is 3 parts, the improved auxiliary agent is 4 parts, the wear-resistant rubber is 16 parts and the toughening plastic is 19 parts.

[0039] Thermoplastic polyurethane includes polyethylene terephthalate and polybutylene adipate, and the proportion of polyethylene terephthalate and polybutylene adipate in the thermoplastic polyurethane is 2:1. The foaming agent is a mixture of BSH formamide-free foaming agent and transparent PVC sole foaming agent, and the proportion of BSH formamide-free foaming agent and transparent PVC sole foaming agent is 1:1. Improved additives include antioxidants, UV inhibitors and anti-aging agents, and the antioxidants, UV inhibitors and anti-aging agents account for 62%, 18% and 9% respectively. The wear-resistant rubber is composed of ethylene-vinyl acetate copolymer and natural rubber, and the proportion of ethylene-vinyl acetate copolymer and natural rubber in the wear-resistant rubber is 76% and 18% respectively. The toughened plastic is composed of olefin block copolymer and polyolefin elastomer, and the proportion of olefin block copolymer and polyolefin elastomer in the toughened plastic is 43% and 47%.

[0040] The air cushion sole is made of a translucent foamed sole composition. An air cushion chamber is provided at the bottom of the sole. The air cushion chamber is filled with gas or transparent gel. The shape, size and position of the air cushion chamber are configured according to the design and functional requirements of the sole.

[0041] The method for making a sole using a translucent foamed sole composition comprises: uniformly mixing thermoplastic polyurethane, a foaming agent, an improved auxiliary agent, wear-resistant rubber and a toughening plastic in the translucent foamed sole composition and injecting the mixture into a mold; heating and applying pressure to the mold to foam the composition and form a sole shape; cooling the mold and taking out the molded sole, wherein the heating temperature of the mold is 112° C. and the pressure applied to the mold is 71 MPa. Before the thermoplastic polyurethane, foaming agent, improved auxiliary agent, wear-resistant rubber and a toughening plastic in the translucent foamed sole composition are injected into the mold, the mixture is degassed and heated. The molded sole is tested and the light transmittance and lightweight effects are average, while the wear resistance and toughness are low. Comparative Example 2

[0042] like Figure 1-Figure 2 As shown, this comparative example provides a translucent foamed sole composition, an air cushion sole and a preparation method thereof, wherein the materials include thermoplastic polyurethane, a foaming agent, an improved auxiliary agent, wear-resistant rubber and a toughening plastic. The thermoplastic polyurethane is transparent, and the transparency of the thermoplastic polyurethane is not less than 90%. In terms of weight, the thermoplastic polyurethane is 58 parts, the foaming agent is 12 parts, the improved auxiliary agent is 16 parts, the wear-resistant rubber is 30 parts and the toughening plastic is 29 parts.

[0043] Thermoplastic polyurethane includes polyethylene terephthalate and polybutylene adipate, and the proportion of polyethylene terephthalate and polybutylene adipate in the thermoplastic polyurethane is 2:1. The foaming agent is a mixture of BSH formamide-free foaming agent and transparent PVC sole foaming agent, and the proportion of BSH formamide-free foaming agent and transparent PVC sole foaming agent is 1:1. Improved additives include antioxidants, UV inhibitors and anti-aging agents, and the antioxidants, UV inhibitors and anti-aging agents account for 63%, 19% and 10% respectively. The wear-resistant rubber is composed of ethylene-vinyl acetate copolymer and natural rubber, and the proportion of ethylene-vinyl acetate copolymer and natural rubber in the wear-resistant rubber is 78% and 19% respectively. The toughened plastic is composed of olefin block copolymer and polyolefin elastomer, and the proportion of olefin block copolymer and polyolefin elastomer in the toughened plastic is 48% and 52%.

[0044] The air cushion sole is made of a translucent foamed sole composition. An air cushion chamber is provided at the bottom of the sole. The air cushion chamber is filled with gas or transparent gel. The shape, size and position of the air cushion chamber are configured according to the design and functional requirements of the sole.

[0045] The method for making a sole using a translucent foamed sole composition comprises: uniformly mixing thermoplastic polyurethane, a foaming agent, an improved auxiliary agent, wear-resistant rubber and a toughening plastic in the translucent foamed sole composition and injecting the mixture into a mold; heating and applying pressure to the mold to foam the composition and form a sole shape; cooling the mold and taking out the molded sole, wherein the heating temperature of the mold is 152° C. and the pressure applied to the mold is 106 MPa. Before the thermoplastic polyurethane, foaming agent, improved auxiliary agent, wear-resistant rubber and a toughening plastic in the translucent foamed sole composition are injected into the mold, the mixture is degassed and heated. The molded sole is tested and the light transmittance and lightweight effects are average, while the wear resistance and toughness are low.

[0046] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which shall fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A light-transmitting foamed sole composition, characterized in that: Its materials include thermoplastic polyurethane, foaming agent, improved auxiliary agent, wear-resistant rubber and toughened plastic. The thermoplastic polyurethane is transparent and has a transparency of not less than 90%. In terms of weight, the thermoplastic polyurethane accounts for 42 to 56 parts, the foaming agent accounts for 4 to 9 parts, the improved auxiliary agent accounts for 7 to 12 parts, the wear-resistant rubber accounts for 18 to 26 parts and the toughened plastic accounts for 22 to 27 parts.

2. The light-transmitting foamed shoe sole composition according to claim 1, characterized in that: The thermoplastic polyurethane comprises polyethylene terephthalate and polybutylene adipate, and the ratio of polyethylene terephthalate to polybutylene adipate in the thermoplastic polyurethane is 2:

1.

3. The light-transmitting foamed shoe sole composition according to claim 1, wherein: The foaming agent is a mixture of a BSH formamide-free foaming agent and a transparent PVC sole foaming agent, and the ratio of the BSH formamide-free foaming agent to the transparent PVC sole foaming agent is 1:

1.

4. The light-transmitting foamed shoe sole composition according to claim 1, wherein: The improved auxiliary agent includes an antioxidant, an anti-ultraviolet agent and an antioxidant, and the antioxidant, the anti-ultraviolet agent and the antioxidant account for 60%-72%, 15%-21% and 7%-13% respectively.

5. The light-transmitting foamed sole composition according to claim 1, characterized in that: The wear-resistant rubber is composed of ethylene-vinyl acetate copolymer and natural rubber, and the proportions of the ethylene-vinyl acetate copolymer and the natural rubber in the wear-resistant rubber are 73%-82% and 15%-22% respectively. The toughened plastic is composed of olefin block copolymer and polyolefin elastomer, and the proportions of the olefin block copolymer and the polyolefin elastomer in the toughened plastic are 42%-53% and 46%-55%.

6. An air cushion sole made of a light-transmitting foam sole composition, characterized in that: The light-transmitting foamed sole composition according to any one of claims 1 to 5 is processed and made, and an air cushion chamber is provided at the bottom of the sole, and the air cushion chamber is filled with gas or transparent gel, and the shape, size and position of the air cushion chamber are configured according to the design and functional requirements of the sole.

7. A method for making a sole using a light-transmitting foamed sole composition, the light-transmitting foamed sole composition according to any one of claims 1 to 5, characterized in that: The thermoplastic polyurethane, the foaming agent, the improved auxiliary agent, the wear-resistant rubber and the toughening plastic in the light-transmitting foaming sole composition are mixed evenly and then injected into a mold; the mold is heated and pressure is applied to foam the composition and form the shape of the sole; the mold is cooled and the molded sole is taken out, the heating temperature of the mold is 120° C.-145° C., and the pressure applied to the mold is 75 MPa-100 MPa.

8. The method for making a shoe sole using the light-transmitting foamed shoe sole composition according to claim 7, wherein: The thermoplastic polyurethane, the foaming agent, the improved auxiliary agent, the wear-resistant rubber and the toughened plastic in the light-transmitting foamed sole composition are subjected to degassing and heating treatment before being injected into a mold.

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