Polypropylene composite material for supercritical carbon dioxide foaming and preparation method of polypropylene composite material

Abstract

The invention discloses a polypropylene composite material for supercritical carbon dioxide foaming and a preparation method of the polypropylene composite material. The polypropylene composite material is prepared from, by weight, 80-90 parts of polypropylene, 1-10 parts of a mesoporous nucleating agent and 1-10 parts of a synergistic nucleating agent. Due to a specific pore structure, mesoporous silica serves as a heterogeneous nucleating agent for polypropylene; by taking advantages of the pore structure and a high specific surface area, a silane coupling agent is grafted to pores and the surface of mesoporous silica to realize polypropylene modification; by enrichment of initiator azodiisobutyronitrile on the surface of mesoporous silica, a heterogeneous foaming agent is achieved after CuBr catalyst modification; the pore structure of the mesoporous silica serving as a polypropylene foaming agent forms an 'air void' structure along with polymers, and consequently nucleating energy barriers can be reduced, and heterogeneous nucleating efficiency is improved effectively; due to adoption of the synergistic nucleating agent, foaming density and efficiency of the common polypropylene foaming material are further improved.

Description

technical field [0001] The invention belongs to the field of organic polymer nanocomposite materials, in particular to a polypropylene composite material used for supercritical carbon dioxide foaming and a preparation method thereof. Background technique [0002] Global energy consumption is increasing, and environmental problems such as the greenhouse effect and air pollution have become severe in recent years, which makes material processing and material manufacturing industry have to make high-performance materials and Try to consider environmental protection and low carbon, or recycle non-toxic and harmless substances. If the automotive materials are made of light and high-strength materials, the weight of the car can be reduced by 10%, which in turn can reduce fuel consumption by 8-9%, and exhaust emissions can also be reduced by about 10%. Polymers and polymer composites are widely used in aerospace, electronic information, biomedicine and other fields due to their ad...

AI Technical Summary

Problems solved by technology

Studies have shown that the cells of supercritical carbon dioxide polypropylene foam materials prepared by traditional heterogeneous nucleating agents used in general-purpose polypropylene materials are often large and unstable in size; The supersaturated state of the supersaturated system causes the cells to be destroyed, which greatly reduces the strength of the polypropylene foam material and affects its use.

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