▎ 摘　　要

NOVELTY - Nitrogen phosphorus dendrimer functionalized graphene flame retardants (I) are new. The carbon sheet structure is graphene oxide, and grafted product is nitrogen phosphorus dendrimer. USE - (I) are useful in preparing polyurethane composite material aspect (claimed). ADVANTAGE - (I) solves the problem of flame retardant dispersed in a polymer material, and improves flame retardant effect of the polymer. DETAILED DESCRIPTION - Nitrogen phosphorus dendrimer functionalized graphene flame retardants of formula (I) are new. The carbon sheet structure is graphene oxide, and grafted product is nitrogen phosphorus dendrimer. G = N-(2-(5,5-dimethyl-2-oxo-2-lambda-5-(1,3,2)dioxaphosphinan-2-ylamino)-ethyl)-propionamide-3-yl of formula (II). An INDEPENDENT CLAIM is also included for preparation of (I).