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Composite foaming agent for polyethylene chemically cross-linked foaming material and preparation method thereof

A chemical cross-linking and foaming material technology, applied in the field of foaming agent, can solve the problems of no effective gas generation, foaming agent cannot be decomposed, and no curing performance, etc., to achieve uniform cell diameter, complete decomposition, and surface smooth effect

Active Publication Date: 2018-11-02
JIANGSU SOPO GRP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Due to the high decomposition temperature of ordinary azodicarbonamide products (200-210°C), the foaming agent cannot be completely decomposed in the foaming formula under the existing process conditions of the foaming agent, and no effective gas generation capacity is formed. , resulting in partial waste of blowing agent
Ordinary azodicarbonamide products have no curing properties, which makes the formability of XPE foam materials poor, resulting in more broken holes and large pores
At present, there is no foaming agent suitable for XPE foaming materials on the market

Method used

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  • Composite foaming agent for polyethylene chemically cross-linked foaming material and preparation method thereof
  • Composite foaming agent for polyethylene chemically cross-linked foaming material and preparation method thereof
  • Composite foaming agent for polyethylene chemically cross-linked foaming material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0028] A compound foaming agent for polyethylene chemically cross-linked foaming materials, the compound foaming agent is composed of 99% azodicarbonamide, 0.5% curing agent, 0.5% accelerator composition. Curing agent and accelerator are vinyltriamine and zinc chloride respectively.

[0029] The preparation method of the compound blowing agent is as follows: in the first stage, the azodicarbonamide, the curing agent, and the accelerator are respectively weighed according to the weight ratio of 99:0.5:0.5; in the second stage, the azodicarbonamide The formamide and the accelerator were mixed in the mixer for 4 minutes, the speed was 300r / min, and the mixing temperature was 24°C; in the third stage, the curing agent was added to the mixer, and the mixing was continued for 12 minutes, and the speed was 210r / min. The mixing temperature is 30°C, and finally a uniformly mixed compound blowing agent product is obtained.

Embodiment 2

[0031] A compound foaming agent for polyethylene chemically cross-linked foaming materials, the compound foaming agent is composed of 61% azodicarbonamide, 30% curing agent, 9% accelerator composition. The curing agent and accelerator are respectively aminoethylpiperazine and zinc propionate.

[0032] The preparation method of the compound foaming agent is as follows: in the first stage, the azodicarbonamide, the curing agent, and the accelerator are respectively weighed according to the weight ratio of 61:30:9; in the second stage, the azodicarbonamide The formamide and the accelerator were mixed in the mixer for 8 minutes at a speed of 120r / min and the mixing temperature was 16°C; in the third stage, the curing agent was added to the mixer and continued to mix for 5 minutes at a speed of 350r / min. The mixing temperature is 43°C, and finally a uniformly mixed compound blowing agent product is obtained.

Embodiment 3

[0034] A compound foaming agent for polyethylene chemically cross-linked foaming materials, the compound foaming agent is composed of 61% azodicarbonamide, 1% curing agent, 38% accelerator composition. The curing agent and the initiator are diaminocyclohexane and zinc nitrate respectively.

[0035] The preparation method of the compound foaming agent is as follows: in the first stage, the azodicarbonamide, the curing agent, and the accelerator are respectively weighed according to the weight ratio of 61:1:38; in the second stage, the azodicarbonamide Mix the formamide and the accelerator in the mixer for 15 minutes at a speed of 100r / min and the mixing temperature at 10°C; in the third stage, add the curing agent to the mixer and continue mixing for 25 minutes at a speed of 300r / min. The mixing temperature is 20°C, and finally a uniformly mixed compound blowing agent product is obtained.

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Abstract

The invention provides a compound foaming agent for a polyethylene chemical crosslinking foam material and a preparation method of the compound foaming agent. The compound foaming agent comprises, in percentage by mass, 61%-99% of azodicarbonamide, 0.5%-38% of a curing agent and 0.5%-38% of an accelerator. The preparation method comprises steps as follows: azodicarbonamide and the accelerator prepared in the proportion are put into a mixer and mixed for 4-15 minutes at the mixing temperature of 10-30 DEG C at the stirring speed of 100-300 r / min; the curing agent is added to the mixer, the mixture is mixed for 5-40 minutes at the mixing temperature of 20-50 DEG C at the stirring speed of 200-350 r / min, and the compound foaming agent is prepared. The decomposition temperature of the compound foaming agent is 152-195 DEG C, the compound foaming agent is decomposed more completely in the foaming process, and waste of the foaming agent is reduced. The compound foaming agent has curing performance for polyethylene, so that the foam material has better forming performance, no broken pores or macropores occur, a foam body with fine and uniform cells can be prepared, and requirements of downstream markets for various kinds of performance of the polyethylene chemical crosslinking foam material are met.

Description

technical field [0001] The invention relates to a foaming agent, in particular to a compound foaming agent used for polyethylene chemically cross-linked foaming materials and a preparation method thereof. Background technique [0002] Chemically cross-linked polyethylene (XPE for short) foaming material is a kind of foam plastic with wide application and superior performance. The product is a new material made of LDPE (low density polyethylene) as the main material, bridged by DCP (crosslinking agent), and foamed with azo-type foaming agent. The market potential is huge and the application prospect is broad. [0003] Due to the high decomposition temperature of ordinary azodicarbonamide products (200-210°C), the foaming agent cannot be completely decomposed in the foaming formula under the existing process conditions of the foaming agent, and no effective gas generation capacity is formed. , resulting in partial waste of blowing agent. Ordinary azodicarbonamide products h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/10C08L23/06
CPCC08J9/103C08J2203/04C08J2323/06C08L23/06
Inventor 吴青龙黄永明张之文朱桂生孙云霞郭如涛唐丽董建平
Owner JIANGSU SOPO GRP