Low-temperature-resistance polypropylene composition and preparation method thereof

Abstract

The invention discloses a low-temperature-resistance polypropylene composition, which comprises the following components in percentage by weight: 40 to 75 percent of polypropylene resin, 15 to 45 percent of toughening system and 10 to 30 percent of mineral filler. The polypropylene resin is a propylene polymer of which the comonomers include ethylene, 1-butene and 1-hexylene, and the content of the comonomers is 5 to 20 percent. The toughening system comprises an elastomer and a toughening synergistic agent. The preparation method comprises the following steps: (1) adding a mineral filler anda polypropylene resin into a high-temperature mixer according to a certain ratio, pre-mixing at 170 to 250 DEG C, granulating, and cooling to obtain coarse material; and (2) uniformly mixing the coarse material with the left polypropylene resin, the elastomer and the toughening synergistic agent, adding the mixture to a double-screw extruder, melting and mixing at 180 to 230 DEG C, granulating, cooling, drying and packaging. The invention has the advantage that the low-temperature-resistance polypropylene composition can meet the safety and appearance use requirements of automobile industry and has high low-temperature impact resistance.

Description

technical field [0001] The invention relates to a polypropylene composition for automobiles, in particular to a polypropylene composition for ultra-low temperature multi-axial impact automobile interior decoration. Background technique [0002] Polypropylene plastic has the characteristics of light weight and easy processing, and has become the largest and fastest-growing variety of automotive plastics. However, the poor low-temperature toughness and relatively low rigidity of polypropylene limit its direct application in automobiles. Therefore, polypropylene for automobiles is generally modified to improve its low-temperature toughness and rigidity to meet the requirements of automotive parts. . Automotive interior parts include dashboards, sub-dashboards, door panels, pillars, glove boxes, etc., especially dashboards and door panels, which have large areas, small wall thickness, and complex structures, requiring materials with excellent rigidity and toughness. Excellent r...

AI Technical Summary

Problems solved by technology

Its advantage is that it has good aging resistance, weather resistance and scratch resistance, but its disadvantage is that the low temperature performance is not good, and there are defects in use.