▎ 摘　　要

NOVELTY - Preparing graphene-based hybrid flame retardant comprises e.g. (1) adding 1-50 pts. wt. graphene oxide and 10-150 pts. wt. de-ionized water to a three-necked flask at the same time, stirring with ultrasonic assistance for 2 hours, adding 1-50 pts. wt. commercial flame retardant solution dropwise to above suspension, ultrasonic stirring for 2 hours, transferring to a high-pressure reactor, and reacting at 70-180 degrees C, cooling, separating precipitate by suction filtration and washing with de-ionized water and ethanol, drying filter cake in a vacuum oven for 24 hours to obtain graphene-based hybrid flame retardant, (2) using 1-50 pts. wt. polyether glycol, 3-150 pts. wt. isocyanate-based monomer, 2-100 pts. wt. chain extender, solid content 1-3 times of organic solvent, placing 0.001-0.01 pts. wt. organic bismuth catalyst in a three-necked flask with a stirring device, nitrogen protection, 50-80 degrees C, reaction for 2-6 hours, get self-repairing polyurethane precursor containing selenium spare. USE - The preparing graphene-based hybrid flame retardant is useful in fields of intelligent packaging and coating. ADVANTAGE - The retardant: is economical, and has good performance. DETAILED DESCRIPTION - Preparing graphene-based hybrid flame retardant comprises (1) adding 1-50 pts. wt. graphene oxide and 10-150 pts. wt. de-ionized water to a three-necked flask at the same time, stirring with ultrasonic assistance for 2 hours, adding 1-50 pts. wt. commercial flame retardant solution dropwise to above suspension, ultrasonic stirring for 2 hours, transferring to a high-pressure reactor, and reacting at 70-180 degrees C, cooling, separating precipitate by suction filtration and washing with de-ionized water and ethanol, drying filter cake in a vacuum oven for 24 hours to obtain graphene-based hybrid flame retardant, (2) using 1-50 pts. wt. polyether glycol, 3-150 pts. wt. isocyanate-based monomer, 2-100 pts. wt. chain extender, solid content 1-3 times of organic solvent, placing 0.001-0.01 pts. wt. organic bismuth catalyst in a three-necked flask with a stirring device, nitrogen protection, 50-80 degrees C, reaction for 2-6 hours, get self-repairing polyurethane precursor containing selenium spare, and (3) in-situ suspension polymerization of graphene-based hybrid flame retardant with polyurethane precursor at a mass percentage of 1-5%, under nitrogen protection, 60-80 degrees C, reacting for 2-6 hours to obtain graphene-based hybrid flame retardant/self-repairing polyurethane flame retardant composite material.