▎ 摘　　要

NOVELTY - Polypropylene composite material with high- efficiency sound insulation and antibacterial performance comprises 50 to 96 pts. wt. polypropylene resin and 4 to 40 pts. wt. coating material, where coating material is diatomite coated graphene, and graphene is pre-treated graphene processed by organic solvent. USE - Polypropylene composite material used as automobile interior material for automobile field (claimed). ADVANTAGE - The polypropylene composite material enables to provide high- efficiency sound insulation and excellent antibacterial performance, good mechanical property. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a preparation method of polypropylene composite material, which involves: (a) dispersing graphene in organic solvent, filtering, taking filter residue, and drying to obtain pre-processed graphene; (b) mixing uniformly pre-treated graphene, and diatomite to obtain coating material of diatomite coated graphene; (c) melting, and mixing coating material with other components, and granulating to obtain polypropylene composite.