Preparation method of nylon foamed sole

Abstract

The invention discloses a preparation method of a nylon foamed sole, which comprises the following steps: cross-linking a cross-linking agent and nylon to obtain pre-crosslinked nylon resin with a melt index of 1.5-4g/10min, the cross-linking agent being an isobutylene maleic anhydride polymer and/or a styrene maleic anhydride polymer, and the number of functional groups of the cross-linking agent being greater than 30; the pre-crosslinked nylon resin and a nucleating agent are mixed to obtain a modified nylon material, the weight percentage of the pre-crosslinked nylon resin is 96-99%, and the weight percentage of the nucleating agent is 1-4%; performing injection molding on the modified nylon material to obtain a plate; the board is placed in a nitrogen supercritical fluid to be subjected to pressure maintaining for 3-8 h, pressure relief is conducted at the speed of 10-15 MPa/min, and a foamed board is obtained; and carrying out mold hot pressing on the foamed sheet to obtain the nylon foamed sole. The preparation method disclosed by the invention is simple in production process and high in foaming efficiency, and the prepared nylon foamed sole is low in density, good in rebound resilience and high in tearing strength.

Description

technical field [0001] The invention relates to the technical field of nylon elastomer foaming, in particular to a method for preparing nylon foamed shoe soles. Background technique [0002] Compared with polyurethane (PU) foam, nylon foam material, ethylene vinyl acetate copolymer (EVA) has higher resilience and weather resistance, and is widely used in many fields such as sports protection, but nylon foam material has a higher density. Poor delamination tearing and poor material strength under low conditions cannot be widely used in the sports shoe industry. At the same time, the production process of nylon material foam requires high temperature, high pressure and other conditions, and the production conditions are relatively harsh, making it difficult to be widely used. [0003] At present, in order to have higher tear strength for the foaming material in the preparation process of nylon foaming foam, polyolefin elastomer (POE) is usually used for blending and grafting w...

AI Technical Summary

Problems solved by technology

[0002] Compared with polyurethane (PU) foam, nylon foam material, ethylene vinyl acetate copolymer (EVA) has higher resilience and weather resistance, and is widely used in many fields such as sports protection, but nylon foam material has a higher density. Poor delamination tearing and poor material strength under low conditions cannot be widely used in the sports shoe industry. At the same time, the production process of nylon material foam requires high temperature, high pressure and other conditions, and the production conditions are relatively harsh, so it is difficult to be widely used

[0003] At present, in order to have higher tear strength for the foaming material in the preparation process of nylon foaming foam, polyolefin elastomer (POE) is usually used for blending and grafting with nylon, and then a crosslinking agent is added to crosslink the POE material to achieve A higher tear strength. Although this method effectively improves the tear strength of the foamed material, the addition of POE material causes a certain loss to the rebound performance of the nylon foamed material. At the same time, the traditional supercritical foaming process Medium foaming efficiency is low or foam shrinkage is serious

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