Polypropylene composite material and preparation method

Abstract

The invention belongs to the field of polypropylene composite material modification, and particularly relates to a polypropylene composite material and a preparation method thereof. The composite material comprises the following components in parts by weight: 30-80 parts of high molecular weight co-polypropylene; 5-40 parts of a filler; 10-30 parts of an elastomer; and 0.4-1 part of a lubricant. The preparation method comprises the following steps of: uniformly mixing the high molecular weight polypropylene, the filler, the elastomer, the lubricant and a processing aid in a mixing device, adding the mixture into an extruder, carrying out melt mixing at 170-240 DEG C, granulating, cooling and drying to obtain the polypropylene composition. The obtained composition has a good appearance effect, and particularly, meets the use requirements of deep geometric dermatoglyph automobile parts.

Description

technical field [0001] The invention belongs to the technical field of modification of polypropylene composite materials. More specifically, it relates to a polypropylene composite material and a preparation method. Background technique [0002] In recent years, with the development of the automobile industry, more and more plastic materials have been used in the interior and exterior parts of automobiles. Among them, polypropylene materials occupy the leading position in automobiles due to their excellent comprehensive performance, wide range of sources, high quality and low price. Use larger proportions of plastics. With the improvement of people's living standards, consumers are paying more and more attention to details such as the appearance of interior and exterior parts of automobiles. Ghost appearance defect is a relatively common appearance defect of injection molded parts. Ghost appearance defect is the appearance difference caused by the temperature, pressure or ...

AI Technical Summary

Problems solved by technology

Ghost appearance defect is a relatively common appearance defect of injection molded parts. Ghost appearance defect is the appearance difference caused by the temperature, pressure or shrinkage mutation of the material during the molding process. In the injection molding process, it is often used to reduce the holding pressure and time. , reduce the pressure at the injection end or increase the injection speed, and increase the mold temperature or reduce the material temperature to reduce the degree of ghosting as much as possible, but the actual effect is very limited, especially now that the automotive interior grains have changed from ordinary rough grains to fine grains. There is a tendency for the grains (usually texture depth ≤ 100 μm) to develop towards the direction of geometric grains (usually the depth of grain textures > 100 μm). The deeper the grains, the greater the possibility of ghost appearance defects on the surface of injection molded parts. Therefore, Deep geometric leather parts often encounter ghost appearance problems during injection molding and cannot be effectively solved

[0003] Ghost defect is a nightmare for the appearance of injection molded parts. Not only is it difficult to effectively solve it in the injection molding process, but also in the material formula, there has been no good solution before, and there are almost no relevant reports in the literature.

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