Foaming agent, preparation method and application

Abstract

The invention relates to the technical field of rubber and plastic, in particular to a foaming agent, a preparation method and an application. The foaming agent is prepared from, in parts by mass, 50-65 parts of a foaming ingredient, 0-5 parts of a foaming aid, 15-50 parts of an active agent and 1-5 parts of a processing aid, wherein the active agent is one or more of an active agent A, an active agent B, an active agent C and an active agent D; the active agent A is weak acid salt of zinc oxide and / or zinc, the active agent B is weak acid salt of magnesium oxide and / or magnesium hydroxide and / or magnesium, the active agent C is weak acid salt of calcium, and the active agent D is weak acid salt of aluminum oxide and / or aluminum; when weak acid salt is dihydric phosphate, the active agent is a mixture of dihydric phosphate and other substances in the active agent; the foaming ingredient is azodicarbonamide. The decomposition temperature of the foaming agent is low, and a foaming product prepared with the foaming agent releases little ammonia gas. The preparation method of the foaming agent can improve the dispersity of the active agent, improve the catalytic capability of the active agent and reduce the dosage of the active agent in a system.

Description

technical field [0001] The invention relates to the technical field of rubber and plastics, in particular to a foaming agent, a preparation method and an application. Background technique [0002] Azodicarbonamide (referred to as blowing agent AC) has been considered as a more environmentally friendly blowing agent because of its low toxicity. The substances produced by its decomposition, such as formamide and ammonia, have been popular for a long time. neglected. In 1995, the European Union put forward requirements on the concentration of ammonia exposure in the workplace, stipulating that the time-weighted concentration STEL of ammonia in the workplace should not exceed 20ppm. The foaming agent used for shoe materials in various countries in the world is generally AC, and the standards established by the European Union will undoubtedly have a great impact on the rubber and plastic industry engaged in the production of foam products. The research results of domestic modif...

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Problems solved by technology

[0004] The invention patent application with the publication number CN103756191 discloses a foaming agent, the composition of which is azodicarbonamide, 4,4-oxobisbenzenesulfonyl hydrazide, sodium bicarbonate, p-toluenesulfonyl Urea, zinc stearate, silicon dioxide and calcium stearate, wherein the amount of active agent is only 11% of the amount of azodicarbonamide, the experiment found that the amount of ammonia gas released by the foamed product prepared with this foaming agent It simply cannot meet the EU standard that the time-weighted concentration STEL of ammonia in the workplace is below 20ppm

[0005] At present, there are few blowing agents that can reduce the decomposition temperature of azodicarbonamide to a reasonable temperature suitable for industrial applications, reduce the amount of ammonia released in the foamed product, and shorten the vulcanization time of the compound rubber. to report

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