A kind of low post-shrinkage polypropylene composite material manufactured by controlling fluidity and its preparation method

Abstract

The invention discloses a low-after-contraction polypropylene composite material manufactured by controlling fluidity. The composite material is obtained by mixing pre-manufactured high-melt-index polypropylene with other polypropylene and materials in a formula and performing twin-screw extrusion granulation. The composite material comprises the following components in percentage by weight: 40-45% of high-melt-index polypropylene, 40-45% of homo-polypropylene, 3-10% of polystyrene, 5-10% of inorganic filler, 0.2-0.4% of a nucleating agent and 0.2-0.6% of an antioxidant, and the components are mixed together. The invention also discloses a preparation method of the low-after-contraction polypropylene composite material manufactured by controlling fluidity. A product prepared from the composite material through injection molding is small in after-contraction and high in glossiness, so that the composite material can be widely applied to production of square electric cooker type products.

Description

technical field [0001] The invention belongs to the technical field of polymer composite materials, and in particular relates to a low-shrinkage polypropylene composite material produced by controlling the fluidity of the material and a preparation method thereof. Background technique [0002] Polypropylene is a large amount of general-purpose plastics. It has low density, low price, easy processing, and no "three wastes" in the processing process. The products are hygienic and safe. It is now widely used in chemical industry, chemical fiber, construction, and light industry. Home appliances and other fields. In the field of home appliances, there is a new type of square rice cooker, which is gradually favored by consumers because of its convenient placement. The surface cover of the square rice cooker can be produced with PP, but because PP is a highly crystalline polymer material, there is still a large aftershrinkage after the product is injection molded, which makes the...

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Problems solved by technology

The surface cover of the square rice cooker can be produced with PP, but because PP is a highly crystalline polymer material, there is still a large aftershrinkage after the product is injection molded, which makes the combination of the surface cover and the body of the square rice cooker poor, resulting in leakage. The product defect of air or the cover cannot be opened, so it must be modified to obtain a polypropylene composite material with a small aftershrinkage