Composition for forming plastification material, shoe insole and preparation method of shoe insole

Abstract

The invention relates to a composition for forming a plastification material, a shoe insole and a preparation method of the shoe insole. The composition for forming the plastification material comprises a polymer ingredient, wherein the polymer ingredient comprises an ethylene vinyl acetate copolymer, an ethylene-alpha-olefin copolymer with a surface hardness scope of 55-60 Shore A, an ethylene-alpha-olefin copolymer with a surface hardness scope of 85-90 Shore A and polypropylene; the surface hardness is determined according to an ASTM D2240 standard method; and a tan delta (-20 DEG C) / tan delta (40 DEG C) value scope of the plastification material formed by the composition is 2.5-3.8 at determination frequency of 10Hz according to a JIS K 7244-4 standard method. The plastification material formed by the composition can have high elasticity and low shrinkage at the same time.

Description

technical field [0001] The present invention relates to a composition for forming a plasticized material, a shoe midsole formed from the composition and a method for preparing the shoe midsole, in particular to a composition comprising ethylene vinyl acetate copolymer ( Ethylene-vinyl acetate copolymer (EVA for short) is used to form a plasticized material composition, a shoe midsole formed from the composition, and a method for preparing the shoe midsole. Background technique [0002] In addition to maintaining a certain hardness, the midsole of sports shoes is expected to have the advantages of elasticity, softness, and light weight. [0003] In order to achieve the above-mentioned various advantages, the industry generally uses a composition comprising ethylene vinyl acetate copolymer as a foaming material for preparing a shoe midsole. The plasticized material formed by foaming the composition containing ethylene vinyl acetate copolymer is used as the shoe midsole materi...

AI Technical Summary

Problems solved by technology

However, after various physical property tests on the plasticized material formed from the existing composition containing ethylene vinyl acetate copolymer, it was found that although the plasticized material can maintain a certain hardness (hardness) and has a high hardness of not less than 55%, elasticity (resilience), but its shrinkage (shrinkage) is higher than 2%, which still cannot meet the needs of the industry, and may also lead to a significant reduction in the dimensional accuracy of subsequent finished products

And US8461222B2 then further researches on the foaming raw material that prepares such as shoe midsole and other sole members, and it adopts the composition based on thermoplastic polyolefin resin as foaming raw material, but the plasticized material elasticity that it forms is still Less than 55%, unable to meet the demand of high elasticity

[0004] In addition, there is still another shortcoming in the existing composition, that is, in the preparation process, if you want to make a shoe midsole with different properties (such as elasticity or shrinkage), you must choose a different material according to the desired properties of the final product. Different compositions and expansion ratios, and even if the same composition is used, different expansion ratios may need to be adjusted; however, changing the expansion ratio requires the use of different foaming molds, which will increase the cost

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