▎ 摘　　要

NOVELTY - Preparing phosphorus-containing functionalized graphene comprises under the presence of supercritical carbon dioxide, grinding graphite and the reaction type phosphorus-containing flame retardant. USE - The phosphorus-containing functionalized graphene is used as flame retardant/reinforcing agent for polymers and their composites (claimed). ADVANTAGE - The phosphorus-containing functionalized graphene: can exhibits high-efficiency flame retardant performance, and can further improve the mechanical properties of the polymer. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for phosphorus-containing functionalized graphene, is prepared by the preparation method.