Whisker modified polypropylene (PP) composite material and preparation method thereof

Abstract

The invention provides a whisker modified polypropylene (PP) composite material. The PP composite material is prepared from 45-87 parts of PP, 10-40 parts of whiskers, 0.5-2 parts of nucleating agent, 3-15 parts of toughening agent, 1-3 parts of compatilizer and 0.1-2 parts of other additives, wherein the whiskers are at least one of magnesium oxide whiskers, basic magnesium sulfate whiskers and magnesium carbonate whiskers. By adding the nucleating agent and the whiskers, such as magnesium oxide, the prepared PP composite material has smaller difference of contractility in each direction, has the characteristic of isotropy, has the effect of overcoming the defect of warping deformation of products caused by non-uniformity of contraction, meets the dimensional assembling requirements of parts and has the effect of extending the application range of the whisker modified material.

Description

technical field [0001] The invention relates to the technical field of polymers, in particular to a whisker-modified polypropylene composite material and a preparation method thereof. Background technique [0002] Whisker-modified polypropylene has been widely researched and applied in automobiles and other fields due to its light weight, high strength, excellent high temperature resistance and good mechanical strength. At present, whisker-modified polypropylene has a mature technology in China, and there are many research reports on the physical and chemical properties of whisker-modified polypropylene. Controlling the shrinkage of polypropylene modified materials is an important aspect of polypropylene modification. However, there are relatively few studies on the shrinkage isotropy of whisker-modified polypropylene. The characteristic of isotropic shrinkage can not only guarantee product quality, but also has great significance for the popularization and use of polypro...

AI Technical Summary

Problems solved by technology

Whisker material is a kind of fibrous single crystal, which has a smaller particle size and a larger aspect ratio. The shrinkage rate of the polypropylene material modified by the whisker is quite different in each direction, which leads to a large difference in the shrinkage rate of the material during injection molding. There is a big difference in shrinkage in different directions, which can easily cause warping and deformation of the workpiece, which limits the wide application of whisker-modified polypropylene materials.

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