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Recyclable EVA virimer foam material, and preparation method and recycling method thereof

A foaming material and foaming agent technology, applied in the field of foaming materials, can solve the problems that cannot be solved well, cannot be directly recycled, cannot directly realize the recyclable use of EVA foam body materials, etc., and achieves excellent mechanical strength, Well-designed effects

Active Publication Date: 2020-06-02
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually, EVA foaming materials are cross-linked by chemical cross-linking agents such as dicumyl peroxide (DCP), diisopropyl azodicarboxylate, etc., because the EVA materials cross-linked by commonly used chemical cross-linking agents belong to chemical The irreversible structure makes this kind of material unable to be recycled directly
[0004] Chinese patent CN104603190A discloses a method of reclaiming waste ethylene-vinyl acetate (EVA) foam, which is to foam the virgin EVA resin and waste EVA foam together with cross-linking agent and blowing agent for EVA resin. foaming and cross-linking, but this method requires the addition of virgin EVA resin, which cannot directly realize the recyclable use of the EVA foam body material, and cannot solve this problem well

Method used

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  • Recyclable EVA virimer foam material, and preparation method and recycling method thereof
  • Recyclable EVA virimer foam material, and preparation method and recycling method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Step 1: Weigh 100 parts of ethylene-vinyl acetate copolymer, 15 parts of tripropyl phosphate, and 0.5 parts of zinc acetylacetonate by weight and pre-mix them in a beaker for 5-10 minutes;

[0028] Step 2: The ethylene-vinyl acetate copolymer premixed in step 1, the crosslinking agent and the catalyst are reactively blended in an extruder for 10 minutes, and the reaction temperature is 150° C. to obtain an EVA vitrimer material;

[0029] Step 3: get the EVA vitrimer material that obtains in the step 2 of 100 parts and carry out mechanical blending in extruder with 20 parts of heat-expandable microspheres, 2 parts of foaming aid zinc oxide and 5 parts of filler white carbon black, The blending temperature is 90°C, and the blending time is 5 minutes;

[0030] Step 4: The kneaded mixture in step 3 was molded and foamed at 150°C for 10 minutes to obtain the original EVA vitrimer foam material, which was named Original EVA foam;

[0031] Step 5: destroy the cell structure o...

Embodiment 2

[0039] Step 1: Weigh 100 parts of ethylene-vinyl acetate copolymer, 15 parts of tripropyl phosphate, and 0.5 parts of zinc acetylacetonate in parts by weight and pre-mix them in a beaker for 5-10 minutes;

[0040] Step 2: The ethylene-vinyl acetate copolymer premixed in step 1, the crosslinking agent and the catalyst are reactively blended in an extruder for 10 minutes, and the reaction temperature is 150° C. to obtain an EVA vitrimer material;

[0041]Step 3: get the EVA vitrimer material that obtains in the step 2 of 100 parts and carry out mechanical blending in extruder with 20 parts of heat-expandable microspheres, 2 parts of foaming aid zinc oxide and 5 parts of filler white carbon black, The blending temperature is 90°C, and the blending time is 5 minutes;

[0042] Step 4: The kneaded mixture in step 3 was molded and foamed at 150°C for 10 minutes to obtain the original EVA vitrimer foam material, which was named Original EVA foam;

[0043] Step 5: Cut the EVA vitrimer...

Embodiment 3

[0047] Step 1: Weigh 100 parts of ethylene-vinyl acetate copolymer, 10 parts of tripropyl phosphate, and 0.1 part of zinc acetylacetonate in parts by weight, and pre-mix them in a beaker for 5-10 minutes;

[0048] Step 2: The ethylene-vinyl acetate copolymer premixed in step 1, the crosslinking agent and the catalyst are reactively blended in an extruder for 5 minutes, and the reaction temperature is 170° C. to obtain an EVA vitrimer material;

[0049] Step 3: Get 100 parts of the EVA vitrimer material obtained in step 2 and carry out mechanical co-processing with 10 parts of azodicarbonamide, 2 parts of foaming aid zinc oxide and 5 parts of filler white carbon black in an extruder Blending, the blending temperature is 80°C, and the blending time is 5min;

[0050] Step 4: The kneaded mixture in step 3 was molded and foamed at 170° C. for 5 minutes to obtain the original EVA vitrimer foam material.

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Abstract

The invention discloses a recyclable EVA virimer foam material, and a preparation method and a recycling method thereof. The foam material is prepared from, by weight, 100 parts of an ethylene-vinyl acetate copolymer, 5-30 parts of a cross-linking agent, 0.1-1 part of a catalyst, 10-24 parts of a foaming agent, 1-10 parts of a foaming aid and 5-20 parts of a filler. The preparation method comprises the following steps: the ethylene-vinyl acetate copolymer, the cross-linking agent and the catalyst are blended through an extruder to prepare a dynamic covalent cross-linked EVA virimer material, then the dynamic covalent cross-linked EVA virimer material is mixed with the foaming agent, the foaming aid and the filler, and the foam material is obtained through mold pressing foaming. The EVA foam material can be recycled by a method of reshaping or re-foaming the EVA virimer foam material. Compared with a traditional EVA foam material, the EVA foam material has the following advantages: repeated foaming can be conducted for multiple times, repeated remodeling processing can be conducted, the good mechanical property can be kept, and reutilization and recycling of the EVA foam material body are effectively achieved.

Description

technical field [0001] The invention belongs to the technical field of foaming materials, and in particular relates to a recyclable EVAvitrimer foaming material, a preparation method and a recycling method thereof. Background technique [0002] Based on the thermal properties of the material, polymers can be classified into thermoplastics and thermosets. Thermoplastic polymers can be reprocessed and reused, but they often have insufficient mechanical properties; the three-dimensional cross-linked network structure of thermosetting polymers makes them have good mechanical strength and solvent resistance, but they cannot be reprocessed. [0003] EVA is a copolymer of ethylene and vinyl acetate. Compared with traditional polyolefin materials, due to the introduction of vinyl acetate monomers in the molecular chain, the crystallinity of the polymer is reduced, and the toughness, impact resistance, and heat resistance are improved. Therefore, it is widely used in foamed shoe mat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/08C08K13/02C08K3/36C08K3/26C08K3/22C08K5/521C08K5/55C08J9/32C08J9/10B29C44/02
CPCB29C44/02C08J9/0038C08J9/0047C08J9/0066C08J9/0095C08J9/103C08J9/32C08J2203/04C08J2203/22C08J2323/08C08K3/36C08K5/521C08K5/55C08K13/02C08K2003/2296C08K2003/265
Inventor 程林俞炜陈诗依
Owner SHANGHAI JIAO TONG UNIV
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