Low-gloss automobile interior part polypropylene composite material and preparation method thereof

Abstract

The invention discloses a low-gloss automobile interior part polypropylene composite material. The material is prepared from the following raw materials in parts by weight: 36 to 53 parts of polypropylene, 30 to 40 parts of RTPO resin, 0 to 6 parts of a toughening agent, 4 to 6 parts of polylactic acid, 10 to 20 parts of talcum powder, 0.4 to 0.6 part of an antioxidant, 0.2 to 0.3 part of a lightstabilizer, 1.5 to 2.0 parts of a scratch-resistant agent and 1 to 2 parts of a pigment. The invention also discloses a preparation method of the low-gloss automobile interior polypropylene compositematerial. According to the invention, the RTPO resin and the polypropylene composite material are blended and modified; the surface roughness of the composite material is remarkably improved, the surface gloss of automobile interior parts is further reduced by means of the degradation process of the polylactic acid material on the surface of the composite material, the surface of the automobile interior parts can have the excellent low gloss characteristic, and the development requirement of decorative integrated materials of automobile interior part materials is met.

Description

technical field [0001] The invention relates to the technical field of automobile materials, in particular to a low-gloss automobile interior trim polypropylene composite material and a preparation method thereof. Background technique [0002] Since the birth of the automobile industry, the development of the automobile industry has significantly changed people's lifestyles. As a convenient means of transportation, automobiles have enriched people's lives and deepened the communication between people. With the acceleration of the rapid development and the improvement of the quality of life, people put forward higher requirements for the safety and comfort of the car. [0003] As a general-purpose plastic, polypropylene (PP) has the advantages of light weight, excellent plasticity, and easy molding. It is widely used in automotive interior parts, involving instrument panels, door inner panels, sub-dashboards, and pillars. For the comfort and safety of the interior parts, the...

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Problems solved by technology

[0004] There have been many reports on improving the surface roughness of polypropylene to reduce the surface gloss. Specifically, it can be divided into the following three methods. One is to incorporate cross-linked polymers , involving styrene-acrylonitrile cross-linked copolymer, vulcanized rubber, peroxide cross-linking agent, maleic anhydride grafted polyolefin elastomer and cross-linked polyethylene, etc. The cross-linked polymer has a network structure, which can reduce the surface of the composite material However, the incorporation of cross-linking matting agent will significantly affect the excess of organic volatile toxic and harmful substances in automotive interior materials, which seriously does not meet the requirements of odor and VOC in automotive interior materials. Mixing, including talcum powder, calcium carbonate, silica, glass fiber, whiskers and wollastonite, etc., the mixing of fillers can reduce the surface gloss of interior materials, but high-filling composite materials have a greater sacrifice in material performance, and In the injection molding process, the weight, size and appearance of the interior parts will also be affected, which cannot meet the requirements of energy saving, environmental protection and aesthetics of the automobile interior. This method is simple, fast, and easy to operate, but this method has high requirements for the selection of skin texture, and improper operation of the matting process may easily lead to damage to the mold skin texture, which affects the aesthetic requirements of interior injection molded parts. Therefore, a Polypropylene composite materials for automotive interiors with outstanding low gloss effect, simple process and green environmental protection have become problems that need to be solved at present

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