High-performance thin-wall polypropylene composite material capable of improving mold sticking and preparation method of high-performance thin-wall polypropylene composite material

Abstract

The invention discloses a high-performance thin-wall polypropylene composite material with improved mold sticking and a preparation method thereof. The polypropylene composite material comprises the following raw materials in parts by weight: 57-75 parts of polypropylene; 14 to 28 parts of functional talcum powder master batch; 8-17 parts of an elastomer; 0-1 part of an antioxidant; 0-3 parts of other auxiliary agents; the invention has the following advantages: in the formula design of the thin-wall polypropylene composite material, the high-efficiency functional talcum powder master batch is adopted to replace the traditional modified polypropylene formula to directly use talcum powder and an auxiliary agent to prepare the material, and the functional talcum powder master batch takes high-fluidity polypropylene as a carrier; when a polymer system is extruded from a twin-screw or an injection molding machine, the high-mesh talcum powder and the elastomer can be well and uniformly dispersed into a composite material system, and meanwhile, the composite lubricant in the functional talcum powder master batch firstly moves towards the outer side of a material melt and is enriched on the surface layer of the material, so that the lubricating property of the whole material system is improved.

Description

technical field [0001] The invention belongs to the technical field of polymer materials and processing thereof, and relates to a mold-improving, high-performance, thin-walled polypropylene composite material and a preparation method thereof. Background technique [0002] With the rapid development of the automobile industry and the increasingly serious environmental problems, all major automobile manufacturers are committed to research on vehicle lightweight. For the most used polypropylene plastic parts in automobiles, the thin-walled design is favored in the vehicle lightweight technology. At present, the traditional wall thickness of automotive plastic parts used by major automobile manufacturers is 2.5-3.0mm, and the wall thickness will reach 1.8-2.2mm after thin-wall design. After the wall thickness of the part is thinned, in order to ensure that the appearance and performance of the part are not lost, the thin-walled part is a type of material that exhibits typical h...

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Problems solved by technology

[0003] At present, thin-walled polypropylene materials are widely used in interior and exterior trims such as automobile pillars, door panels, instrument panels, and bumpers. When encountering some thin-walled parts with complex structures, large sizes, and long processes, such as thin-walled insurance Bar parts, materials in the injection molding production process, the thinner the wall thickness of the parts, the material melt is easily affected by the strong flow shear force at the thinner wall thickness, which will lead to a certain surface displacement of the material. After pressing, the surface of the part and the surface of the mold are relatively tight, and there will be a certain amount of mold sticking during demoulding, which will seriously affect the appearance of the part. Intensified, not conducive to the continuous production of parts

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