▎ 摘　　要

NOVELTY - Halogen-free and phosphorus-free environmental protection flame retardant preparation involves hydroxylating ether group of graphene oxide in an aqueous graphene oxide solution, and then refluxing to obtain hydroxylated graphene oxide. The hydroxylated graphene oxide is hydroxylated to obtain carboxylated graphene oxide. The obtained carboxylated graphene oxide and ethanol are added into nitrogen-protected multi-mouth bottle with stirring at 105-115 degrees C for 16-20 hours, and then cooled at normal temperature. USE - Method for preparing halogen-free and phosphorus-free environmental protection flame retardant. ADVANTAGE - The method prepares the halogen-free and phosphorus-free environmental protection flame retardant in a simple and cost-effective manner with better compatibility with polyester. DETAILED DESCRIPTION - Halogen-free and phosphorus-free environmental protection flame retardant preparation involves hydroxylating ether group of graphene oxide in an aqueous graphene oxide solution, and then refluxing to obtain hydroxylated graphene oxide. The hydroxylated graphene oxide is hydroxylated to obtain carboxylated graphene oxide. The obtained carboxylated graphene oxide and ethanol are added into nitrogen-protected multi-mouth bottle with stirring at 105-115 degrees C for 16-20 hours, and then cooled at normal temperature. The mixed solution of terephthalic acid, propanol, nano-yttrium trioxide, graphene oxide and ethanol is added to a nitrogen-protected reactor at 220-240 degrees C. The reaction is completed at 230-240 degrees C for 0.5-1 hour, and then heated at 265-275 degrees C for 3-4 hours to obtain the crystalline flame retardant.