Low-density low-shrinkage high-gloss polypropylene compound as well as preparation method and product thereof

Abstract

The invention provides a low-density low-shrinkage high-gloss polypropylene compound as well as a preparation method and a product thereof. The compound is prepared from the following components in parts by weight: 14 to 40 percent of homo-polypropylene, 15 to 40 percent of block co-polypropylene, 10 to 35 percent of toughening agent, 5 to 45 percent of inorganic filler, 0.05 to 0.5 percent of nucleating agent, 0.1 to 0.5 percent of coupling agent and 0.1 to 0.4 percent of antioxidant. According to the polypropylene composite, through the toughening agent, the shrinkage of the product can be greatly reduced, the density is lower, the shrinkage rate of the polypropylene composite material can be reduced to be close to that of ABS resin by only adding a very small amount of inorganic filler, and meanwhile, very high glossiness and relatively low density are maintained. The low-density low-shrinkage high-gloss polypropylene compound can be used for manufacturing various plastic products, and is particularly suitable for manufacturing products such as automobile plastic products or household appliance shells.

Description

technical field [0001] The invention belongs to the technical field of plastics, and in particular relates to a low-density, low-shrinkage, high-gloss polypropylene composite and a preparation method and products thereof. Background technique [0002] Because of its low density, excellent mechanical properties, good heat resistance, and high chemical stability, polypropylene (PP) has become one of the most widely researched and applied general-purpose plastics in the fields of home appliances, automobiles, and plastic pipes. Favored. However, due to its shortcomings such as poor impact performance and large shrinkage rate, it is limited in processing applications. PP is a highly crystalline polymer material. During the injection molding, storage and use of the product, some shrinkage behaviors often occur, resulting in warpage of the product, local internal stress and unstable product size. Therefore, reducing the shrinkage rate of PP has become an important research direc...

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Problems solved by technology

There are also cases where fillers with a large aspect ratio are used to improve the shrinkage of polypropylene. For example, patent CN200810207579 uses glass fibers, whiskers and other inorganic materials to fill modified polypropylene. Using high aspect ratio modified polypropylene can be used in a single direction. Obviously reduce the shrinkage rate, but it will easily produce uneven shrinkage rate, which will cause the product to be very easy to warp and deform. In addition, floating fibers are prone to appear on the surface of the product, the surface flatness of the product is poor, and the appearance of the product is not good. At the same time, the long diameter of the inorganic filler will be maintained in the future. ratio, usually factories need to use side feed to add whiskers and glass fibers

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