EVA-TPU dual hardness foaming sole material and preparation method thereof

Abstract

The invention discloses a sole material capable of realizing dual hardness foaming. The sole material is prepared from the following raw materials in parts by weight: 100 parts of TPU and EVA in total, 20-30 parts of a compatibilizer, 5-8 parts of a foaming agent, 0.7-1 part of a crosslinking agent, 3-5 parts of an activator and 19-20 parts of a nucleating agent, wherein TPU accounts for 30-70 parts, EVA accounts for 30-70 parts, the compatibilizer is a high polymer of ethylene and octylene, the foaming agent is azodicarbonamide, the crosslinking agent is dicumyl peroxide, the activator is one of zinc oxide / stearic acid or zinc stearate, and the nucleating agent is calcium carbonate. The sole material disclosed by the invention has the advantages that wear resistance of a TPU foaming material and the flexibility and processability of an EVA foaming material are comprehensively utilized, so that the problem that an EVA-TPU composite is poor in compatibility is solved, the sole material which realizes synchronous crosslinking and uniform foaming, 'outsole-insole' integrated moulding and dual hardness foaming is prepared, and the sole material has excellent wear resistance, high elasticity and comfort.

Description

[0001] Technical field: [0002] The invention relates to the field of materials, in particular to a dual-hardness TPU-EVA foam sole material and a manufacturing method thereof. [0003] Background technique: [0004] Today's world shoe materials and their molding process are developing very rapidly. The traditional sole is mainly formed by bonding the midsole and the outsole. The outsole is often made of rubber with high anti-slip and wear resistance, while the midsole is often made of shock-absorbing and comfortable materials such as EVA. At present, the sole molding technology has been developed to the integrated molding technology of midsole and outsole. The TPU-EVA composite foam material system proposed by the present invention can cooperate with the advanced shoe sole integrated molding technology to prepare dual-hardness composite material shoe soles. [0005] EVA and TPU are two common sole materials. Among them, EVA resin is an ethylene-vinyl acetate copolymer, whi...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the defects of the EVA sole material in the prior art, such as wear resistance, insufficient folding resistance and low comfort of the TPU sole material, and provide a dual-hardness foamed sole material formed by EVA / TPU compounding and Its preparation process solves the problem of poor compatibility of EVA-TPU composite materials, and can give full play to the excellent processing performance of EVA and the wear resistance of TPU. Using the composite material provided by the invention, it can be made synchronously cross-linked and uniform. Foaming, "outsole-middle sole" integrated molding, dual-hardness foaming sole material, can meet the requirements of wear resistance, high elasticity and comfort required by the new sole to the greatest extent, and greatly extend the use of the sole time