▎ 摘　　要

NOVELTY - Polypropylene complex material comprises 50-99 pts. wt. polypropylene resin, 0.01-0.2 pts. wt. graphene, and 5-20 pts. wt. acidified montmorillonite. USE - The material is useful in the field of automobile interior decoration (instrument panel, upright post or door panel, etc.). ADVANTAGE - The material: has excellent sound insulation and impact resistance. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing the polypropylene complex material, comprising (i) homogeneously mixing graphene and acidified montmorillonite to obtain mixture A, and (ii) mixing the mixture A, polypropylene resin, toughener, processing auxiliary agent, antioxidant and lubricant into a extruder from a main feeding port, adding the filler from a side feeding port, melting, mixing, homogenizing, extruding and granulating to obtain the polypropylene complex material, where the length-to-diameter ratio of a extrusion screw of the extruder is 36-48:1.