PREPARATION METHOD FOR RECYCLABLE EVA/PVA FOAMED MATERIAL, AND FOAMED MATERIAL

WIPO Patent Application WO/2024/011918

A1

The present invention provides a preparation method for a recyclable EVA/PVA foamed material. The method comprises: respectively adding a PVA with an alcoholysis degree of 30-88% and an EVA with a vinyl acetate content of 5-60% to a torque rheometer, and then carrying out a first blending treatment; respectively adding a catalyst and a cross-linking agent to the torque rheometer, and then carrying out a second blending treatment; respectively adding a foaming agent, a filling agent and an active agent to the torque rheometer, and then carrying out a third blending treatment to obtain a material for later use; subjecting the material to mold pressing foam formation, so as to obtain an EVA/PVA foamed material. In the present invention, a mechanical blending method is used; EVA is used in conjunction with a PVA glue with a low alcoholysis degree; an ester exchange reaction is used under the action of a catalyst, to obtain an EVA foamed material with dynamic crosslinking and bonding; and the material has a high utilization rate, relatively good physical and mechanical properties after recycling, and a relatively high production efficiency.

XIAO HUI (CN)
WANG JINGYI (CN)
LIN HONGYU (CN)
ZHANG QINGHAI (CN)
LU XIN (CN)
ZHAN YINGXU (CN)
LIAO YIBIN (CN)
LIU DONGBIN (CN)

PCT/CN2023/078578

January 18, 2024

February 28, 2023

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UNIV LIMING VOCATIONAL (CN)

C08L23/08; C08J3/24; C08J9/10; C08K5/521; C08K5/55; C08L29/04

CN115073844A	2022-09-20
CN114437447A	2022-05-06
CN111218054A	2020-06-02
CN104371141A	2015-02-25
JPS53147745A	1978-12-22
US20150225527A1	2015-08-13

QUANZHOU WENHUA PATENT AGENY CO., LTD. (CN)

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