▎ 摘　　要

NOVELTY - Graphene oxide-based phosphorus-nitrogen-silicon composite flame-retardant copolyester comprises polyester monomer, graphene oxide, phosphazene, polyhedral oligomeric silsesquioxane and phosphonic acid. The mass ratio of graphene oxide, phosphorus in phosphazene, silicon in polyhedral oligomeric silsesquioxane, and phosphorus in phosphonic acid is 1:(0.25-4):(0.05-3):(1-6). USE - The graphene oxide-based phosphorus-nitrogen-silicon composite flame-retardant copolyester is used in textiles, engineering plastic, packaging, electric appliance electronics and garment textile field. ADVANTAGE - The graphene oxide-based phosphorus-nitrogen-silicon composite flame-retardant copolyester has excellent flame retardant, smoke inhibiting and anti-drop performance. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: preparing the composite flame-retardant copolyester, comprising (1) dispersing the graphene oxide to obtain a uniform suspension, (2) adding phosphazene and polyhedral oligomeric silsesquioxane into the suspension for reaction, and (3) adding phosphonic acid and polyester monomer to the product obtained in step (2) to react to obtain graphene oxide-based phosphorus-nitrogen-silicon composite flame-retardant copolyester; and graphene oxide-based phosphorus-nitrogen-silicon composite flame-retardant copolyester obtained by the above preparation method.