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

A technology of ozone oxidation and foaming materials, applied in household components, applications, household appliances, etc., can solve the problems of 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: 2008-02-13
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

Examples

Experimental program
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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 55 mg / L to obtain o-LDPE. 30 g of o-LDPE, 70 g of EVA, 0.65 g of DCP, and AC blowing agent 3.2g, 0.8 parts of ZnO, 0.4g of HSt and 0.4g of ZnSt were added to the double-roller mixer for melting and mixing. The mixing temperature was 105-130°C, and the tablets were produced after mixing for 10-15 minutes. The obtained EVA / PE The mixed compound is placed in a flat vulcanizer for molding and foaming. The foaming temperature is 160-170 ° C, the molding pressure is 10-15 MPa, and the molding and foaming time is 15-35 minutes 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 55 mg / L to obtain o-LDPE. 15 g of o-LDPE, 85 g of EVA, 0.65 g of DCP, and AC blowing agent 3.2g, 0.8 parts of ZnO, 0.4g of HSt and 0.4g of ZnSt were added to the double-roller mixer for melting and mixing. The mixing temperature was 105-130°C, and the tablets were produced after mixing for 10-15 minutes. The obtained EVA / PE The mixed compound is placed in a flat vulcanizer for molding and foaming. The foaming temperature is 160-170 ° C, the molding pressure is 10-15 MPa, and the molding and foaming time is 15-35 minutes 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 55 mg / L to obtain o-LDPE. 30 g of o-LDPE, 70 g of EVA, 0.65 g of DCP, and AC blowing agent 3.2g, 0.8 parts of ZnO, 0.4g of HSt and 0.4g of ZnSt were added to the double-roller mixer for melting and mixing. The mixing temperature was 105-130°C, and the tablets were produced after mixing for 10-15 minutes. The obtained EVA / PE The mixed compound is placed in a flat vulcanizer for molding and foaming. The foaming temperature is 160-170 ° C, the molding pressure is 10-15 MPa, and the molding and foaming time is 15-35 minutes to obtain an EVA / PE blended foam material.

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Abstract

The invention discloses a method using the ozone oxidation to improve the performance of the EVA / PE blend foam material. (a) the ozone oxidation is done for the polyethylene (PE) powder at the temperature between 20 and 90 Celsius system; the concentration of the ozone gas is between 10 and 75 mg per liter; the time of the ozone oxidation is between 10 and 180 minutes; (b) the ethylene-acetate ethylene ester copolymer (EVA) and the polyethylene treated by the ozone oxidation are mixed well according to the proportion from 90 to 10 to form 60 to 40; 100 weight shares of the mixture, 0.5 to 0.8 weight shares of the dicumyl peroxide (DCP), 2.0 to 4.0 weight shares of the vesicant, 0.4 to 1.2 weight shares of the zinc oxide (ZnO), 0 to 0.6 weight shares of the stearic acid (HSt), 0 to 0.6 weight shares of the zinc stearate (ZnSt) and 0 to 10 weight shares of the inorganic mineral powder are taken; the dual-roller mixer is added into to be melted and mixed; the mixing temperature is between 105 and 130 Celsius system; the mixing time is between 10 and 15 minutes; then the EVA / PE blend complex can be made; (c) the blended complex is arranged on the flat vulcanization machine to mold and foam; the foaming temperature is between 160 and 170 Celsius system; the mold compression pressure is between 10 and 15 MPa; the foaming time of the mold compression is between 15 and 35 minutes; then the EVA / PE blend foam material can be made.

Description

Technical field: [0001] The invention relates to a preparation method of an EVA / PE blended foam material, belonging 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 existence of randomly 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 movement ability is enhanced, and the macroscopic performance is high elasticity. EVA can be used to manufacture closed-cell foam materials with high expansion ratios. It has light weight, shock resistance, softness, excellent resilience, small compression deformation, and weather resistance. Good performance, widely used in industry, construction, aquaculture, especially in the field of shoe materials. However, the cost of EVA foam material is high, an...

Claims

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Application Information

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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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