Low-gloss polypropylene composite material and preparation method thereof

Abstract

The invention discloses a low-gloss polypropylene composite material which is prepared from the following raw materials by weight percent: 45-99% of polypropylene, 0-42% of inorganic filling material, 0-10% of flexibilizer POE (polyolefin elastomer), 0.5-4% of organic delustering agent, 0.1-2% of antioxidant and 0-3% of other additives. The preparation method comprises the following steps: weighing the raw materials in proportion; mixing polypropylene, the inorganic filling material, the flexibilizer, the organic delustering agent, the antioxidant, a light stabilizing agent and the other additives in a high-speed stirrer; putting the obtained mixture in a two-screw extruder for melt extrusion; and after extrusion, cooling, drying and grain-sized dicing to obtain a finished product. According to the invention, a method of adding a proper amount of styrene-acrylonitrile crosslinking copolymer into polypropylene is adopted, thus the prepared polypropylene composite material has the characteristic of low gloss, and simultaneously the polypropylene composite material basically has original physical property. The low-gloss polypropylene composite material disclosed by the invention is suitable for being applied to inner decorative materials for home appliances, automobiles and the like.

Description

technical field [0001] The invention relates to a composition of a low-gloss polypropylene composite material and a preparation method thereof, belonging to the technical field of polymer modification and processing. Background technique [0002] Polypropylene (PP) is currently widely used in the automotive industry, especially as interior and exterior decoration materials for automobiles, because of its good processing performance and physical and chemical properties, as well as light weight and low price. With the development of the automobile industry, people have put forward higher requirements for automobiles: light weight, energy saving, aesthetics, safety, environmental protection, etc., especially the requirements for comfort and safety in the cab are getting higher and higher. If the gloss of the cockpit interior parts is high, there will be strong light reflection, which will affect the comfort of the driver. Therefore, automotive interior parts need to have a low...

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Problems solved by technology

[0004] There have been some reports on reducing the glossiness of polypropylene composite materials. The application number is CN200710171710.0, which discloses a method for reducing the surface glossiness of composite materials by adding inorganic silica, but to a certain extent, the shear of the screw will cause filler The destruction of its own structure affects the comprehensive performance of composite materials

The application number is CN200810207904.6, which discloses a method for reducing the surface gloss of composite materials by adding inorganic filler wollastonite. The decrease in gloss is more obvious than that of talcum powder and calcium carbonate, but the increase of inorganic filler will change the original material to a certain extent. The mechanical properties such as impact properties will decrease

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