Method for preparing polypropylene composite

Abstract

The invention relates to a method for preparing a polypropylene composite. The method is characterized in that the polypropylene composite is prepared from polypropylene, a compatibilizer, glass fibers, a nucleating agent and an anti-oxidant according to a two-step process. The method comprises the following steps: the nucleating agent is utilized to induce crystal transfer of polypropylene; the glass fibers are compounded with polypropylene subjected to crystal transfer for further enhancement. Therefore, the problem that according to a traditional method in which polypropylene is directly mixed with a nucleating agent and fibers, the polypropylene crystallization behavior regulation and control functions of the nucleating agent cannot be effectively played due to introduction of the glass fibers serving as external impurities is solved. According to the method provided by the invention, regulation and control of the nucleating agent and enhancement of the glass fibers are effectively combined together to improve the combination property of the polypropylene composite, so that the polypropylene composite prepared by the method is not only excellent in comprehensive mechanical property but also high in thermal stability. Meanwhile, the raw materials (the glass fibers) are low in price and easily accessible, and a twin-screw extrusion process is simple and low in cost, so that large-scale production and application can be conveniently realized.

Description

Technical field [0001] The invention relates to a method for preparing a polypropylene composite material, in particular to a method for preparing a polypropylene composite material through the modification of glass fiber and a nucleating agent. Background technique [0002] As one of the five general plastics, polypropylene (PP) has the advantages of low price, low density, easy processing and good mechanical properties. With the continuous expansion of the application range, it has been applied to aerospace, food packaging, automotive and other fields . However, PP also has some shortcomings, such as: high shrinkage, low toughness and easy aging, sensitivity to light and heat, and low impact strength at low temperatures, which limit its further application. [0003] In order to expand the application range of PP, researchers have developed many methods to modify polypropylene, such as adding fillers or nucleating agents. Polypropylene is a polycrystalline polymer, and the commo...

AI Technical Summary

Problems solved by technology

[0051] The object of the present invention is to provide a low-cost, simple process, a method for preparing a polypropylene composite material that effectively combines nucleating agent regulation and fiber reinforcement, and synergistically improves the comprehensive performance of the polypropylene composite material. The method is made of polypropylene , compatibilizer, glass fiber, nucleating agent, and antioxidant are prepared by a two-step method. First, the nucleating agent is used to induce the crystal transformation of polypropylene, and then the glass fiber is compounded with it for further reinforcement. It solves the problem that the traditional method directly mixes polypropylene with nucleating agent and fiber. Due to the introduction of glass fiber as a foreign impurity, the nucleating agent cannot effectively play its role in regulating the crystallization behavior of polypropylene.

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