▎ 摘　　要

NOVELTY - The method for preparation of high load of phosphorus-nitrogen graphene flame retardant, involves carrying out reaction of isocyanate and surface grafted graphene oxide to obtain isocyanate functionalized graphene, reacting isocyanate functionalized graphene with dendrimer poly(amidoamine) (PAMAM) to prepare dendrimers functionalized graphene, reacting dendrimers functionalized graphene with phosphorus oxychloride compound to obtain high load of phosphorus- nitrogen graphene flame retardant. USE - Preparation of high load of phosphorus-nitrogen graphene flame retardant (claimed). ADVANTAGE - The method provides flame retardant modified polymer materials, and improves the mechanical properties of polymer materials.