▎ 摘　　要

NOVELTY - Graphite and graphene composite modified polyurethane waterproof coating film comprises a coating layer and a cover layer, and the coating layer is a continuous film layer formed after the graphene-modified polyurethane emulsion is coated. The cover layer is a dense graphite solid powder layer formed by uniform scattering and rolling of expandable graphite. The cover layer is combined with the coating layer. USE - Graphite and graphene composite modified polyurethane waterproof coating film ADVANTAGE - The composite modified polyurethane waterproof coating has excellent weather resistance, ultraviolet resistance, can be exposed construction, saves construction cost, has flame retardance, and improves the fire-extinguishing safety of the building. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation method of graphite and graphene composite modified polyurethane waterproof coating film, which involves modifying graphene with a coupling agent, and adding the coupling agent-modified graphene with water to form a coupling agent-modified graphene aqueous dispersion with a concentration of 15-25 wt.%, adding the coupling agent-modified graphene aqueous dispersion into the polyurethane emulsion according to the specified proportion, and using mechanical stirring to make the coupling agent-modified graphene uniformly dispersed in the polyurethane emulsion to prepare the graphene-modified polyurethane emulsion, preparing graphene-modified polyurethane emulsion into a coating layer of a certain thickness by brushing or scraping, drying the surface of the coating layer, spreading expandable graphite uniformly on its surface immediately to ensure no leakage, and using a graphite roller to roll and control the thickness of the coating layer, and cleaning off and recycling the excess expandable graphite on the surface of the cover layer.