Polypropylene composite material and preparation method thereof, sheet or irregular section prepared thereby and application thereof

Abstract

The invention discloses a polypropylene composite material and a preparation method thereof, a sheet or an irregular section prepared thereby and application thereof. The composite material comprises50-80 parts of polypropylene, 5-20 parts of a skin texture copying agent, and 10-30 parts of a size stabilizing agent; the width of half peak of a crystallization peak of the polypropylene is 3-7 DEGC; the peak temperature of the crystallization peak of the polypropylene is 113-120 DEG C; the peak temperature of the crystallization peak of the skin and texture copying agent is 90-100 DEG C. According to the polypropylene composite material, the mold releasing expansion rate and the glossiness of the composite material are reduced, and meanwhile, the material is high in shrinkage rate; the material is low in mold releasing expansion rate, so that injection molding defects such as bright shadow, waveform and white spots in skin and texture copying can be effectively avoided; material support is supplied to nice skin and texture design; the structural design can integrate more aesthetic effects.

Description

technical field [0001] The invention belongs to the technical field of polymer composite materials, and in particular relates to a polypropylene composite material and a preparation method thereof, a sheet or profiled material prepared therefrom and an application thereof. technical background [0002] For automotive interior materials, with the improvement of people's comfort and aesthetic requirements, injection-molded plastic parts are required to have various shades and thicknesses of skin texture, which affects the shrinkage rate, gloss and scratch resistance of the material. Scrubbing puts forward higher requirements. At present, automotive interior materials are mainly PP toughened and filled. The shrinkage of these materials is affected by the type and quantity of matrix resin, toughener and filler, but the overall shrinkage of these materials is above 0.9%. Die expansion ratios are above 1.5. For parts with deep skin texture and fine skin texture, this kind of shr...

AI Technical Summary

Problems solved by technology

The material can be used to produce structural parts due to its high strength and low shrinkage, but the glass fiber reinforced material uses the retained length of the glass fiber to play a reinforcing role. Because of the anisotropy of the glass fiber, it cannot be used to produce Parts with skin texture, and the treatment agent on the surface of the glass fiber and the glass fiber itself are likely to cause sensitive skin allergies, so it should be used with caution in automotive interior parts, especially large parts exposed in the interior

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