▎ 摘　　要

NOVELTY - High molecular composite flame retardant, is claimed. The high molecular composite flame retardant is prepared by heating hyperbranched high molecular flame retardant, adding modified graphene oxide and reacting. USE - The composite flame retardant is useful as an additive in plastic and paint (claimed). ADVANTAGE - The composite flame retardant: has excellent wear resistance property. DETAILED DESCRIPTION - AN INDEPENDENT CLAIM is also included for preparing high molecular composite flame retardant comprising (i) mixing phosphorus nitrogen flame retardant monomer and 3-aminopropyltriethoxysilane in a molar ratio of 3:2.1-3:2.2, stirring reacting at 145-155 ℃ at a speed of 400-600 revolution per minute for 12-16 hours under argon atmosphere and normal pressure, and cooling to room temperature to obtain hyperbranched high molecular flame retardant, (ii) mixing graphite powder, sodium nitrate and concentrated sulfuric acid in a mass fraction of 90-98% in a mass ratio of 2:1:150-3:1:200, stirring at 0-5 ℃ at a speed of 400-600 revolution per minute for 4-6 minutes, adding potassium permanganate (3-4 times the mass of graphite powder at a uniform speed within 8-10 minutes), stirring for 6-8 minutes, stirring at 30-40 ℃ at a speed of 400-600 revolution per minute for 3-4 hours, then placing in pure water with 300-400 times the mass of graphite powder at 0-2 ℃, adding 30-34% hydrogen peroxide (3-4 times the mass of graphite powder at 0-2 ℃), stirring at a speed of 400-600 revolution per minute for 3-4 hours, filtering, washing with pure water for 3-5 times, and drying at 60-70 ℃ for 10-12 hours to obtain graphene oxide, (iii) mixing aluminum nitrate, calcium nitrate, magnesium nitrate and pure water in a mass ratio of 1:1:1:10-1:1:1:15, then adding 15-20 wt.% sodium hydroxide solution (10-15 times the mass of aluminum nitrate), stirring at 20-30 ℃ at a speed of 800-1000 revolution per minute for 20-30 minutes, then raising the temperature to 90-100 ℃, stirring, adding graphene oxide dispersion (10-14 times the mass of aluminum nitrate within 20-30 minutes), placing in the autoclave, stirring and reacting at 90-100 ℃ at a speed of 300-500 revolution per minute for 20-24 hours, taking out, washing with pure water for 3-5 times, and drying at 60-70 ℃ for 10-12 hours to obtain modified graphene oxide, and (iv) heating the hyperbranched high molecular flame retardant to 175-185 ℃, stirring at a speed of 200-300 revolution per minute, adding modified graphene oxide (0.4-0.6 times the mass of hyperbranched high molecular flame retardant), stirring at a uniform speed for 20-30 minutes, again stirring for 3-4 hours, cooling to 125-135 ℃, adding p-xylene (80-100 times the mass of hyperbranched high molecular flame retardant), stirring for 20-30 minutes, filtering, washing with pure water and absolute ethanol for 3-5 times, drying at 60-70 ℃ for 10-12 hours, then placing in a pulverizer and grinding into 200-300 mesh sieve to obtain high molecular composite flame retardant.