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Special foaming agent for hard PVC (polyvinyl chloride) low-foaming material and preparation method thereof

A foaming agent and low-foaming technology, which is used in the preparation of special foaming agents for rigid PVC low-foaming materials, can solve the problems of large cells, resin aging and unevenness of foam products, and achieve fine cells. Structure, foaming process control, easy effect of foaming process

Inactive Publication Date: 2014-04-30
WEIFANG YAXING GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the decomposition temperature of azodicarbonamide ADC does not coincide with the processing temperature of PVC, when using azodicarbonamide ADC for this type of resin, the processing temperature must be increased, which will easily lead to resin aging, discoloration, and foam products with large cells , uneven and rupture accidents

Method used

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  • Special foaming agent for hard PVC (polyvinyl chloride) low-foaming material and preparation method thereof
  • Special foaming agent for hard PVC (polyvinyl chloride) low-foaming material and preparation method thereof
  • Special foaming agent for hard PVC (polyvinyl chloride) low-foaming material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Adopt 800g azodicarbonamide ADC, 80g zinc stearate, 10g silicon dioxide, 10g calcium stearate, produce foaming agent of the present invention respectively with different auxiliary blowing agent 200g, each raw material is as shown in table-1 Show. First add silicon dioxide and calcium stearate into the mixer and mix for 3 minutes, then add azodicarbonamide, 4,4'-oxobisbenzenesulfonyl hydrazide OBSH or sodium bicarbonate or p-toluenesulfonamide Urea TSSC and zinc stearate were placed in a mixer and mixed for 10 minutes to obtain each foaming agent of the present invention.

[0020] According to the industry standard of azodicarbonamide ADC, the decomposition temperature of the blowing agent of the present invention was tested, and the results are shown in Table-1.

[0021] Table-1 (unit g)

[0022]

Embodiment 2

[0024] 750g of azodicarbonamide ADC, 200g of 4,4'-oxobisbenzenesulfonyl hydrazide OBSH, 5g of silicon dioxide, 15g of calcium stearate, and 80g of different types of activators are used to produce the blowing agent of the present invention respectively, The raw materials are shown in Table-2. First, add silicon dioxide and calcium stearate into the mixer and mix for 3 minutes, then add azodicarbonamide, 4,4'-oxobisbenzenesulfonyl hydrazide OBSH, Dibasic lead phosphite or zinc oxide or tribasic lead sulfate are placed in a mixer and mixed for 15 minutes to obtain the blowing agent of the present invention.

[0025] According to the azodicarbonamide ADC industry standard, the decomposition temperature of the foaming agent of the present invention was tested, and the results are shown in Table-2.

[0026] Table-2 (unit g)

[0027]

Embodiment 3

[0029] Mix 700g of azodicarbonamide ADC, 200g of sodium bicarbonate, 80g of lead stearate, and 15g of talcum powder. Produce whipping agent of the present invention respectively with different kinds of processing aid 5g, each raw material is as shown in table-3, at first talcum powder, stearic acid or polyethylene wax or calcium stearate are added in mixer and mix 7 minutes, Azodicarbonamide, sodium bicarbonate, and lead stearate were placed in a mixer in turn, and mixed for 20 minutes to obtain the blowing agent of the present invention.

[0030] According to the azodicarbonamide ADC industry standard, the decomposition temperature of the blowing agent of the present invention was tested, and the results are shown in Table-3.

[0031] Table-3 (unit g)

[0032]

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Abstract

The invention discloses a special foaming agent for a hard PVC (polyvinyl chloride) low-foaming material and a preparation method thereof. The special foaming agent comprises the following materials in parts by weight: 20-80 parts of azodicarbonamide (ADC), 20-80 parts of auxiliary foaming agent, 1-20 parts of activating agent, 0.2-10 parts of dispersing agent and 0.2-5 parts of processing agent. The preparation method comprises the steps: adding the dispersing agent and the processing agent in a mixer, mixing for 3-7 minutes, and sequentially uniformly mixing the ADC, the auxiliary foaming agent and the activating agent in the mixer to prepare the special foaming agent. The special foaming agent is suitable for hard PVC low-foam materials such as PVC crushing and low-foaming sectional bars, tubular products and sheets, a wood-plastics low-foaming material and the like. The special foaming agent has the positive effects that 1, the decomposition temperature is 160-190 DEG C, and is within a processing temperature range of the hard PVC low-foaming material; 2, the foaming process is short in induction period, the decomposition is performed without mutation, and the foaming process is easily controlled; 3, the hard PVC low-foaming material is used on a hard PVC low-foaming product, and has a smooth surface and has no discoloring and ageing phenomena; and 4, the special foaming agent is low in cost and good in comprehensive performance, and accords with the use requirement.

Description

technical field [0001] The invention relates to a special-purpose foaming agent for rigid PVC low-foaming materials, in particular to a preparation method of a special-purpose foaming agent for rigid PVC low-foaming materials. Background technique [0002] There are many criteria for selecting a suitable chemical blowing agent, obviously the most important being that the decomposition of the chemical blowing agent must occur within the processing temperature range of the polymer. As far as rigid PVC low-foaming materials are concerned, its processing temperature range is 160-190°C, while the decomposition temperature of the foaming agent azodicarbonamide ADC is 195-220°C, which is relatively high, so it is difficult to directly apply them to PVC. Applied in foam materials. Since the decomposition temperature of azodicarbonamide ADC does not match the processing temperature of PVC, when using azodicarbonamide ADC for this type of resin, the processing temperature must be inc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/06C08J9/10C08K13/02
Inventor 韩风杨雷李白贤刘杰梁霞董军宁张坤明姜曙光
Owner WEIFANG YAXING GRP CO LTD
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