Polypropylene injection molding chemical micro-foamed composite material and preparation method thereof

Abstract

The invention provides a preparation method of a polypropylene injection molding chemical micro-foamed composite material. The polypropylene micro-foamed composite material is prepared by uniformly mixing a polypropylene composite material and a foaming agent and molding an obtained mixture by adopting a secondary mold opening process, wherein the polypropylene composite material is prepared from the following materials in parts by weight: 57 to 63 parts of polypropylene, 0.1 to 25 parts of talcum powder, 0.1 to 20 parts of flexibilizer, 2 to 10 parts of dendritic macromolecule master batch, 0.2 to 0.4 part of antioxidant, 0.5 to 1 part of lubricating agent, and 0 to 3 parts of other additives, wherein the chemical foaming agent is sodium hydrogen carbonate master batch of LDPE carriers. Melt strength of the polypropylene composite system is mutually entangled and regulated with a matrix by virtue of the special dendritic structure of the dendritic macromolecule, after the foaming, a core layer presents in an obvious sandwiched structure, the diameter of a foam hole is 60 micrometers, and the foam holes are uniform and dense; and in addition, the heat insulation, sound insulation and noise reduction can be achieved, a novel solution is provided for developing the light-weight material, and the prepared polypropylene injection molding chemical micro-foamed composite material can be widely applied to products such as automotive interior door panels, instrument panels.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, in particular to a polypropylene injection molding chemical micro-foaming composite material and a preparation method thereof. [0002] technical background: [0003] In recent years, the crisis of energy and environment has accelerated the strict control of energy consumption and emissions of products in the automotive industry by governments of various countries. By 2020, the fuel consumption requirements for passenger vehicles in major automobile production and consumption countries and regions in the world except the United States will be strictly limited to less than 5L / 100km, and carbon emissions will also be stricter. Automobile lightweight has become an urgent need for automobile OEMs. Designers have been focusing on finding alternative materials and design changes to reduce weight when pursuing the development of automobile lightweight technology. The polypropylene micro-foam c...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the technical problem to be solved by the present invention is to provide a polypropylene injection molding chemical micro-foaming composite material and its preparation method to solve the problem of rapid melt strength after the polypropylene reaches the melting point in the foaming process of the prior art. Reduced, resulting in difficult control of the foaming process in the composite system, serious bubble collapse, seriously affecting the performance of polypropylene micro-foaming, limiting the application of polypropylene micro-foaming in the automotive industry, etc.

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