White foaming agent with delayed foaming function and preparation method thereof

Abstract

The invention relates to a white foaming agent with a delayed foaming function and a preparation method thereof. The foaming agent is of a core-shell structure, a core of the foaming agent adopts sodium bicarbonate particles as a gas forming material, and the shell of the foaming agent is composed of non-volatile matters obtained by volatilizing an oxidized polyethlene wax emulsion. Through an emulsion volatilization method, the sodium bicarbonate particle gas-forming material is wrapped in a shell formed by the non-volatile matters obtained by volatilizing the oxidized polyethlene wax emulsion, so decomposition and gas forming of the sodium bicarbonate core at a temperature higher than the thermal decomposition temperature of the sodium bicarbonate core can be delayed, the function of delaying advanced decomposition and gas forming of sodium bicarbonate is achieved, the performance of foamed plastic can be greatly improved, cost is reduced, and production is convenient.

Description

Technical field [0001] The present invention relates to a foaming technique, particularly a white foaming agent having delayed foaming function. Background technique [0002] Foam plastics are widely used in all areas of the national economy, especially in the fields of heat insulation, loss of sound absorption, absorption load, etc., almost indispensable. At present, the foam is mainly polyurethane, polystyrene foam, polyvinyl chloride foam, polyethylene foam, phenolic foam, and the like. Among them, polyurethane, polystyrene, polyvinyl chloride, is the most widely used, called three major foam varieties. The foaming agent used is primarily azo-like yellow blowing agent, as well as a white foaming agent mainly based on sodium bicarbonate. Compared with the yellow foaming agent, the white foaming agent has the advantages of low price, non-toxic and harmless, and is difficult to replace. However, due to polystyrene, polyvinyl chloride, polystyrene, polyvinyl chloride, etc. in thre...

AI Technical Summary

Problems solved by technology

However, since polystyrene and polyvinyl chloride among the three major foam plastics are thermoplastics, they need to be heated and formed during the production process, and the temperature is above 120 degrees Celsius, which is much higher than the thermal decomposition of sodium bicarbonate temperature, which will lead to premature foaming of sodium bicarbonate in the production of related foam plastics, resulting in product performance degradation, as well as serious waste