Method for increasing EVA/PE blending foaming material performance by ozone oxidization

A technology of ozone oxidation and foaming materials, which is applied in the direction of household components, applications, household appliances, etc., can solve the problems that it is difficult to change the high regularity of PE macromolecular chains, the modification effect is not obvious, and the environment causes pollution, etc., to improve both Phase compatibility, comprehensive performance improvement, low density effect

Inactive Publication Date: 2009-12-16
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN1370798 discloses a method for preparing ethylene-vinyl acetate copolymer / linear low-density polyethylene foam by irradiation crosslinking, but the method does not improve the compatibility of EVA and PE; CN1970611 discloses a kind of EVA / PE / The preparation method of starch composite foaming material uses surface modifiers to improve the interface adhesion of EVA and PE, but the addition of surface modifiers is difficult to change the high regularity of PE macromolecular chains, and the modification effect is not obvious. The cost of the product is reduced, and its production process is also likely to cause pollution to the environment

Method used

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  • Method for increasing EVA/PE blending foaming material performance by ozone oxidization
  • Method for increasing EVA/PE blending foaming material performance by ozone oxidization
  • Method for increasing EVA/PE blending foaming material performance by ozone oxidization

Examples

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Effect test

Embodiment 1

[0024] Example 1: Put LDPE into an ozone reactor and react for 40 minutes at a reaction temperature of 80°C and an ozone concentration of 55mg / L to obtain o-LDPE. O-LDPE 30g, EVA 70g, DCP 0.65g, AC blowing agent 3.2g, 0.8 parts of ZnO, 0.4g of HSt and 0.4g of ZnSt were added to a two-roll mixer for melting and kneading. The mixing temperature was 105~130℃, and the EVA / PE was mixed for 10~15min. The mixed compound is placed in a flat plate vulcanizer for molding and foaming, the foaming temperature is 160-170 DEG C, the molding pressure is 10-15 MPa, and the molding and foaming time is 15-35 min, to obtain an EVA / PE blended foam material.

Embodiment 2

[0025] Example 2: Put LDPE into an ozone reactor and react for 40 minutes at a reaction temperature of 80°C and an ozone concentration of 55mg / L to obtain o-LDPE. O-LDPE 15g, EVA 85g, DCP 0.65g, AC blowing agent 3.2g, 0.8 parts of ZnO, 0.4g of HSt and 0.4g of ZnSt were added to a two-roll mixer for melting and kneading. The mixing temperature was 105~130℃, and the EVA / PE was mixed for 10~15min. The mixed compound is placed in a flat plate vulcanizer for molding and foaming, the foaming temperature is 160-170 DEG C, the molding pressure is 10-15 MPa, and the molding and foaming time is 15-35 min, to obtain an EVA / PE blended foam material.

Embodiment 3

[0026] Example 3: Put LDPE into an ozone reactor and react for 60 minutes at a reaction temperature of 80°C and an ozone concentration of 55mg / L to obtain o-LDPE. O-LDPE 30g, EVA 70g, DCP 0.65g, AC blowing agent 3.2g, 0.8 parts of ZnO, 0.4g of HSt and 0.4g of ZnSt were added to a two-roll mixer for melting and kneading. The mixing temperature was 105~130℃, and the EVA / PE was mixed for 10~15min. The mixed compound is placed in a flat plate vulcanizer for molding and foaming, the foaming temperature is 160-170 DEG C, the molding pressure is 10-15 MPa, and the molding and foaming time is 15-35 min, to obtain an EVA / PE blended foam material.

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Abstract

The invention discloses a method for improving the performance of an EVA / PE blended foam material by ozone oxidation. (a) The polyethylene (PE) powder is subjected to ozone oxidation treatment at 20-90°C, the ozone gas concentration is 10-75mg / L, and the ozone oxidation time is 10-180min; (b) Ethylene-vinyl acetate copolymer (EVA) and the above-mentioned ozone-oxidized polyethylene are uniformly mixed in a mass ratio of 90:10 to 60:40, 100 parts by mass of the above-mentioned blend, 0.5 to 0.8 parts by mass of dicumyl peroxide (DCP), and foamed 2.0-4.0 parts by mass of agent, 0.4-1.2 parts by mass of zinc oxide (ZnO), 0-0.6 parts by mass of stearic acid (HSt), 0-0.6 parts by mass of zinc stearate (ZnSt) and 0-10 parts by mass of inorganic mineral powder Parts are added to a twin-roller kneader for melt kneading, the kneading temperature is 105-130°C, and the kneading time is 10-15 minutes to obtain an EVA / PE blend compound. (c) Place the above-mentioned blended compound in a flat vulcanizing machine for molding and foaming. The foaming temperature is 160-170°C, the molding pressure is 10-15MPa, and the molding and foaming time is 15-35min. Mixed foam material.

Description

Technical field: [0001] The invention relates to a preparation method of an EVA / PE blended foam material, which belongs to the field of polymer processing. Background technique: [0002] Ethylene-vinyl acetate copolymer resin (EVA) is a kind of thermoplastic elastomer material with excellent performance. Due to the presence of random copolymerized vinyl acetate in the molecular chain structure, the regularity and crystallinity of the PE molecular chain are greatly reduced. The flexibility of the chain is improved, the thermal motion ability is enhanced, and the macroscopic performance is high elasticity. EVA can be used to make closed-cell foam materials with high foaming ratio. It has light weight, shock resistance, softness, excellent resilience, small compression set, and weather resistance. Good performance, widely used in industry, construction, aquaculture, especially in the field of shoe materials. However, the high cost of EVA foam material, the poor mechanical strength, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/04C08L23/08C08F8/06B29B7/56B29B7/72B29C44/60C08L23/26B29L31/50
Inventor 邹华维范萍朱燕罗文州刘鹏波徐闻罗利琴
Owner SICHUAN UNIV
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