▎ 摘　　要

NOVELTY - Polypropylene-dopamine/oxidation graphene composite membrane (PVDF) composite membrane comprises a PVDF-based membrane and a poly dopamine-oxidation-graphene composite layer compounded on the PVDF based film. USE - Polypropylene-dopamine/oxidation graphene composite membrane (PVDF) composite membrane used in water treatment (claimed). ADVANTAGE - The PVDF composite film has good hydrophilicity, high pollution resistance of new material oxidation graphene large area and high density are uniformly arranged on the separation film surface the existing separating film, by the aggregate of dopamine, the oxidation graphene directly fixed on the PVDF film surface dopamine, because the dopamine contains a large amount of amino and hydrophilic groups, capable of preventing oxidation graphene the particle agglomeration, increasing the film hydrophillicity, and with strong adhesion to the film material, solving the problem that oxidation graphene easy to fall off in the using process. The method is simple and easy to operate, low cost, suitable for industrial large area popularization and application, also suitable for various separation film, and the obtained film material property is stable, belonging to the multi-purpose environment-friendly material. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation method for PVDF composite film, which involves: a. mixing the oxidized graphene aqueous solution, dopamine hydrochloride and buffer solution adjusting the pH value to obtain the mixed solution; b. soaking the PVDF base film in the mixed solution obtained after reacting and then heat setting to obtain the PVDF composite film.