Composite foaming agent and preparation method and application thereof

Abstract

The invention discloses a composite foaming agent, a preparation method thereof and application thereof. The composite foaming agent comprises azodicarbonamide, sodium bicarbonate and an auxiliary foaming agent in a weight ratio of (0.3-0.9):(0.2-0.6):(0.1-0.8). The auxiliary foaming agent is prepared by uniformly stirring attapulgite, zeolite and calcite, soaking the mixture in diluted hydrochloric acid of which the concentration is 0.5 to 6 weight percent, drying the mixture, crushing the dried mixture into powder, blending the powder and powdery white carbon black and uniformly stirring the mixture, wherein the weight ratio of the attapulgite to the zeolite to the calcite to the white carbon black is (0.3-0.8):(0.02-0.6):(0.1-0.8):(0.01-0.8). The composite foaming agent disclosed by the invention has relatively high liquidity and dispersibility, a low decomposition temperature and a long decomposition temperature period.

Description

technical field [0001] The invention relates to a foaming agent and its preparation method and application. Background technique [0002] Petroleum energy is becoming increasingly exhausted as a non-renewable energy source, but plastics are more and more widely used in life, and the regeneration of plastics has become an important part of energy saving, and the molecular weight of recycled plastics is gradually reduced due to one or more repeated uses , the processing temperature is very different from that of new materials, and the original plastic product processing technology and original formula must be changed accordingly. As the most widely used plastic polyethylene PE among the five general-purpose plastics, it has a wide range of applications, such as packaging materials, films, industrial insulation materials, cushioning materials, shoe materials, luggage and other items, and among these items, many of them use foam sponge products. Form (abbreviated as foam produc...

AI Technical Summary

Problems solved by technology

[0003] At present, the commonly used foaming agent is mainly azodicarbonamide plus zinc oxide, or azodicarbonamide plus zinc stearate. The vulcanization time of this foaming agent is about 15 minutes, and the temperature is 175 ° C ~ 185 ° C. It is yellow, and because the melting point of azodicarbonamide is too high, the plastic will be over-plasticized if it continues to heat, and the plasticizing temperature range of the material will be widened due to the addition of recycled materials, plus azodicarbonamide as a foaming agent The decomposition temperature of diformamide is too high, and the decomposition temperature range is too short to achieve the blending of the two

[0004] In addition, there are various kinds of recycled plastics, including shampoo bottles, shower gel bottles, soda bottles, etc. Due to the different tastes, the smell is stronger when they are mixed together, and the resulting products have an unpleasant smell, which is a major drawback of this industry.