Novel high-intensity high heat-resistance polypropylene modified composite material and preparation method thereof

Abstract

The invention relates to a novel high-intensity high heat-resistance polypropylene modified composite material and a preparation method thereof. The novel high-intensity high heat-resistance polypropylene modified composite material comprises the following components: 49-69.4 percent of polypropylene, 10-30 percent of calcium sulphate whiskers, 5-25 percent of glass fibers, 5-15 percent of maleic anhydride grafted polypropylene, 0.1-0.2 percent of nucleating agents, 0.3-0.6 percent of antioxygen and 0.2-0.5 percent of lubricating agents. The preparation method comprises the following steps: firstly uniformly mixing all the components except the glass fibers in a mixer according to the proportion; mixing the mixture in a double-screw extruder; adding the glass fibers from a fiberglass intake of the double-screw extruder; and mixing the mixture in the double-screw extruder, extruding, cooling and pelletizing. The calcium sulphate whiskers and the glass fibers are mixed to reinforce the polypropylene; in addition, with the special structure of the calcium suhphate whiskers, not only the intensity and the heat-resistance of the polypropylene modified material can be enhanced, but also the size stability and the surface finish of products can be improved, and the application field of the polypropylene modified material can be enlarged.

Description

technical field

[0001] The invention relates to a polypropylene material, in particular to a novel high-strength and high-heat-resistant polypropylene modified composite material and a preparation method thereof. Background technique

[0002] Glass fiber reinforced polypropylene (GF / PP) composites have replaced some engineering plastics and are widely used in industry. However, the surface of glass fiber reinforced polypropylene composite products is relatively rough, and the products are easy to warp and deform, so they are not suitable for injection molding. Parts with high appearance requirements and precise structure. Calcium sulfate (CaSO 4 ) Whisker reinforced polypropylene does not have this problem.

[0003] CaSO 4 Whiskers have good dispersion and are a fibrous single crystal with an aspect ratio greater than 30. They have extremely high strength and rigidity, and the strength loss is minimal when the temperature rises. They can be used for plastic modification t...

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