The invention discloses a
scratching-resistant and stress-whitening prevention
polypropylene compound, which comprises, by weight, 40% to 95% of
polypropylene, 2% to 20% of elastomers, 0% to 15% of
polyethylene, 0% to 30% of talcum
powder, 1% to 5% of
scratching-resistant agent, 0.5% to 8% of compatilizer, 0.1 % to 1% of oxidation inhibitor and 0.1% to 0.5% of light stabilizer, wherein the compatilizer is
polyolefin organosilicon copolymer or
alkyl modified polysiloxane. The preparation method of the
scratching-resistant and stress-whitening prevention
polypropylene compound includes steps offirstly, taking all components by weighing according to the percentage, mixing the polypropylene, the elastomers, the
polyethylene, the scratching-resistant agent and the compatilizer in a high-mixing
machine for one to three minutes, then adding the talcum
powder, the oxidation inhibitor and the light stabilizer to be mixed together for one to three minutes, and obtaining pre-
mixed materials; and secondly, melting and extruding the pre-
mixed materials by a double-screw extruder, and pelleting in a
vacuum state so as to obtain the scratching-resistant and stress-whitening prevention polypropylene, wherein the temperature of each area of screws ranges from 190 DEG C to 230 DEG C. The scratching-resistant and stress-whitening prevention polypropylene compound has the advantages that scratching resistance is improved by the aid of polysiloxane scratching-resistant agent, the problem of serious
stress whitening of workpieces during injection molding, mounting and using due to introductionof the scratching-resistant agent is solved, and
pass rate of products is high.