Preparation method of TPEE foamed sole

Abstract

The invention discloses a preparation method of a TPEE foamed sole, which comprises the following steps: cross-linking a cross-linking agent and TPEE to obtain pre-crosslinked TPEE resin, 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; mixing the pre-crosslinked TPEE resin with a nucleating agent to obtain a modified TPEE material; carrying out injection molding on the modified TPEE material to obtain a plate; the plate is placed in a carbon dioxide supercritical fluid for pressure maintaining for 1-3 h, and the pressure is relieved to 3-5 MPa within 0.5-1 h; then placing in a nitrogen supercritical fluid, maintaining the pressure for 2-3 hours, and releasing the pressure at the speed of 10-15 MPa / min to obtain a foamed sheet; and carrying out mold hot pressing on the foamed sheet to obtain the TPEE foamed sole. The preparation method disclosed by the invention is simple in production process and high in foaming efficiency, and the prepared TPEE foamed sole is low in density, good in rebound resilience and good in overall mechanical property.

Description

technical field [0001] The invention relates to the technical field of TPEE elastomer foaming, in particular to a preparation method of TPEE foaming shoe soles. Background technique [0002] Compared with polyurethane (PU) foam and ethylene vinyl acetate copolymer (EVA), TPEE foam material has higher resilience and weather resistance, and is cheaper than nylon elastomer material, and is widely used in many fields such as sports protection field, but TPEE has high crystallinity and high melting point, so it is difficult to use traditional chemical foaming. At present, maleic anhydride grafted EVA is mainly used as a compatibilizer to blend and foam TPEE and EVA. However, when the content of TPEE is high, there is a relatively serious phase separation phenomenon, which seriously affects the performance of the foam material, and it is difficult to obtain a foam with excellent performance. Foam materials are difficult to be widely used. At the same time, the traditional supercr...

AI Technical Summary

Problems solved by technology

[0002] Compared with polyurethane (PU) foam and ethylene vinyl acetate copolymer (EVA), TPEE foam material has higher resilience and weather resistance, and is cheaper than nylon elastomer material, and is widely used in many fields such as sports protection field, but TPEE has high crystallinity and high melting point, so it is difficult to use traditional chemical foaming

At present, maleic anhydride grafted EVA is mainly used as a compatibilizer to blend and foam TPEE and EVA. However, when the content of TPEE is high, there is a relatively serious phase separation phenomenon, which seriously affects the performance of the foam material, and it is difficult to obtain a foam with excellent performance. Foam materials are difficult to be widely used. At the same time, the traditional supercritical foaming process has low foaming efficiency or severe foam shrinkage.

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