Polysiloxane microsphere foaming agent for expanded polypropylene plastics and preparation method

Abstract

The invention aims to provide a polysiloxane microsphere foaming agent for expanded polypropylene plastics and a preparation method. The polysiloxane microsphere foaming agent is prepared from hollow polysiloxane microspheres and an azo foaming agent contained in the hollow microspheres, wherein the azo foaming agent contains at least one of azodicarbonamide and diisopropyl azodicarboxylate; the foaming agent is prepared from 67wt%-89wt% by weight of the polysiloxane microspheres, 11wt%-32wt% by weight of the azo foaming agent and the balance of water, and the particle size is 1.2-4.9 mu m. The foaming agent is applied to the expanded polypropylene plastics and has certain interactions with polypropylene macromolecules, the interactions can serve as physical cross-linking points during melting, so that slip between the polypropylene macromolecules becomes more difficult, the polypropylene melt strength is improved, and high-quality expanded polypropylene materials are obtained.

Description

technical field [0001] The invention belongs to the technical field of foaming materials, and in particular relates to a polysiloxane microsphere foaming agent for foaming polypropylene plastics and a preparation method thereof. Background technique [0002] In the past 10 years, the average annual growth rate of polypropylene resin production in my country has reached 23.1%. In 2010, the production capacity of polypropylene resin in my country reached 6.5 million tons per year. However, at present, polypropylene resin in my country is mainly used in woven products and agricultural films, etc., and the polypropylene resin industry faces the problems of single consumption structure, low demand and low-grade products. [0003] E polypropylene (Expanded Polypropylene) is an expanded polypropylene material. It is a high-performance high-crystalline polymer / gas composite material. With its unique and superior performance, it has become the fastest growing environmentally friendly...

AI Technical Summary

Problems solved by technology

However, in the process of chemical cross-linking modification, there are breakages of polypropylene chains at the same time, and sometimes only breakage without cross-linking, so the use of simple cross-linking agents is not ideal for improving the melt strength of polypropylene.