Low-temperature modified foaming agent and preparation method thereof

A foaming agent and modification technology, which is applied in the field of low-temperature modified foaming agent and its preparation, can solve the problems of too low decomposition temperature of the foaming agent, easy deliquescence of urotropine, and difficulty in storage.

Active Publication Date: 2012-05-02
HANGZHOU HI TECH FINE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Zinc salts have a strong activation effect, and the common ones are zinc oxide, zinc stearate and zinc acetate, but most of the existing zinc salts are added to the foaming agent, which often makes the decomposition temperature of the foaming agent drop too low , it is usually necessary to add substances that inhibit the activation of zinc salts at the same time, such as urotropine for mixing and compounding, in order to achieve the application effect
But urotropine is easy to deliquescence and not easy to store

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Take 100g of azodicarbonamide foaming agent (average particle size is 10-15 μm), put it in a food blender, add different amounts of zinc cyanurate respectively, then cover and seal the blender, and stir for 5 minutes to obtain the present invention. foaming agent.

[0014] Add 0.5g of the above sample into a 25ml test tube, put it in an oil bath, raise the temperature to 220°C at a rate of 2-3°C per minute, the released gas enters the gas measuring tube through the hose, and record when the blowing agent decomposes The temperature, atmospheric pressure and room temperature, calculate the gas evolution under S.T.P. The result is as follows:

[0015] Foaming agent 1 2 3 4 5 Azodicarbonamide blowing agent / g 100 100 100 100 100 Zinc cyanurate / g 1 3 5 8 10 Decomposition temperature / ℃ 177.3 178.2 178.8 180.5 181.4 Gas volume / ml.g -1 193.1 191.3 190.5 188.9 187.5

Embodiment 2

[0017] Take 90g of azodicarbonamide foaming agent (average particle size of 10-15μm), 10g of dinitrosopentamethylenetetramine foaming agent and put them in a food blender, add different amounts of zinc cyanurate respectively, Then cover and seal the stirrer and stir for 5 minutes to obtain the blowing agent of the present invention.

[0018] Add 0.5g of the above sample into a 25ml test tube, put it in an oil bath, raise the temperature to 220°C at a rate of 2-3°C per minute, the released gas enters the gas measuring tube through the hose, and record when the blowing agent decomposes The temperature, atmospheric pressure and room temperature, calculate the gas evolution under S.T.P. The result is as follows:

[0019] Foaming agent 1 2 3 4 5 Azodicarbonamide blowing agent / g 90 90 90 90 90 Dinitrosopentamethylenetetramine blowing agent 10 10 10 10 10 Zinc cyanurate / g 1 3 5 8 10 Decomposition temperature / ℃ 157.1 158.3 158.7 15...

Embodiment 3

[0021] With 6 parts of whipping agents in embodiment 1 and embodiment 2, 100 parts of PVC resins, 30 parts of light calcium, 0.5 part of zinc oxide, 1 part of stearic acid and 0.5 part of DCP, add mixing in open mill, Then place it in a mold of 150*150*20mm and foam at 160°C.

[0022] The prepared foam material has uniform cells and a smooth surface, and the blowing agent decomposes completely without residue.

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PUM

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Abstract

The invention relates to a low-temperature modified foaming agent and a preparation method thereof. The foaming agent employs a zinc cyanuric acid as a modifier, and 1-10 parts by weight of zinc cyanuric acid are added into 100 parts by weight of the foaming agent, so that decomposition temperature of a high-temperature foaming agent can be reduced effectively, and the foaming agent can adapt to processing conditions of various rubber products; meanwhile, the zinc cyanuric acid is a heat stabilizer for a plurality of kinds of rubbers, in this way, addition of the zinc cyanuric acid can both lead the foaming agent to be adapt to processing temperatures of rubber plastics and thermally stabilize rubber products.

Description

technical field [0001] The invention relates to a low-temperature modified foaming agent and a preparation method thereof. Background technique [0002] As we all know, adding a foaming agent to rubber products can produce fine cells during the processing of rubber products. The foaming agent forms a porous foam structure in expandable materials such as resins at a specific temperature. The most commonly used foaming agent is Foaming agents include azodicarbonamide, 4,4'-oxobisbenzenesulfonyl hydrazide, benzenesulfonyl hydrazide, p-toluenesulfonyl hydrazide, dinitrosopentamethylenetetramine and sodium bicarbonate. [0003] It is often difficult for a single type of blowing agent to meet the performance requirements of multiple polymers and multiple processed products of the same polymer. Usually, foaming agents with high decomposition temperature, such as azodicarbonamide foaming agent, cannot be directly used for foaming PVC, EVA, XPE and other resins, so two or more foami...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/10C08J9/08
Inventor 董梅谢雪源陈海贤
Owner HANGZHOU HI TECH FINE CHEM
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