Polypropylene composite material and preparation method thereof

Abstract

The invention discloses a polypropylene composite material and a preparation method thereof. The polypropylene composite material is prepared from 70-85 parts by weight of polypropylene resin, 5-15 parts by weight of a flexibilizer, 5-15 parts by weight of basic magnesium sulfate whiskers, 1-5 parts by weight of polyvinyl acetate, 0.2 part by weight of an initiator and 0.8 part by weight of other auxiliary agents. According to the invention, a small amount of basic magnesium sulfate whiskers are added into the polypropylene resin, and the basic magnesium sulfate whiskers have relatively low density and needle-shaped structures, so that the rigidity of the polypropylene material can be better enhanced; and then polyvinyl acetate with high molecular weight is added, a polar group is introduced on a polypropylene molecular chain, and screw combinations among all areas of an extruder are simultaneously adjusted, so that the basic magnesium sulfate whiskers are uniformly dispersed and anchored on the polypropylene molecular chain.

Description

technical field [0001] The invention belongs to the technical field of modification of high-resolution materials, and in particular relates to a polypropylene composite material and a preparation method thereof. Background technique [0002] Polypropylene (referred to as PP) material is a general-purpose thermoplastic resin, which has the advantages of low density, low price, easy processing and molding, and a wide range of sources. It is widely used in automobiles, home appliances and other markets. However, the balance of rigidity and toughness and weather resistance of pure polypropylene materials are poor, so polypropylene resins need to be modified. [0003] With the continuous development of the automobile industry, major OEMs are pursuing higher performance polypropylene composite materials. The current and future trend is that the wall thickness of automobile parts is getting thinner and thinner, which requires materials to have higher fluidity, higher rigidity and ...

AI Technical Summary

Problems solved by technology

The current polypropylene modification technology is mostly limited to the simple blending and extrusion of polypropylene resin plus toughener and mineral filling components. The modified polypropylene material has certain mechanical properties and can basically meet the traditional requirements. Demand for auto parts, but unable to adapt to future development trends

[0004] The Chinese patent with the publication number CN 107868183 A uses 2-hydroxyethyl acrylate grafted on the molecular chain of polypropylene to improve the performance of polypropylene, and 2-hydroxyethyl acrylate is a low molecular weight liquid compound. It is easy to volatilize during the high temperature extrusion process in the extruder, and the unreacted 2-hydroxyethyl acrylate monomer remains in the polypropylene, which has a great influence on the material properties, and the final polypropylene compound has low performance

The Chinese patent with the publication number CN 101070417 A adopts grafting maleic anhydride, styrene and acrylic acid on the molecular chain of polypropylene to improve the surface polarity of polypropylene, and the same maleic anhydride, styrene and acrylic acid are low molecular weight The liquid monomer itself is highly volatile, and will volatilize in large quantities during the extrusion process, resulting in a decrease in the grafting rate, and at the same time, the residual monomer in the final material will affect the performance of the material

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