▎ 摘　　要

NOVELTY - A graphene-filled polypropylene composite material contains 0.5-2 pts. wt. graphene and 98-99.5 pts. wt. polypropylene. USE - A graphene-filled polypropylene composite material (claimed). ADVANTAGE - Composite material has good positive temperature coefficient property and electric heating and overheating protection function, and preparation method is simple, and has convenient operation and good repeatability. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of graphene-filled polypropylene composite material which involves uniformly mixing 0.5-2 pts. wt. graphene and 98-99.5 pts. wt. polypropylene, placing in mold, pre-heating, pressing, demolding, and cooling to room temperature.