▎ 摘　　要

NOVELTY - A graphene modified flame retardant and light resistant aqueous polyurethane coating is prepared by adding 3-hydroxyl-7-methoxy-2-naphthoic acid, sodium carboxymethyl cellulose, ethanol, magnesium ethoxide, zinc acetate, diethanolamine and N-bromosuccinimide into ketone and sulfonyl chloride, reacting, distilling solvent, cooling and filtering, washing filter cake with hot potassium bicarbonate solution, water washing to neutral, drying, and re-crystallizing using tetrahydrofuran with methanol and acetone to obtain powder catalyst. USE - Method for preparing graphene modified flame retardant and light resistant aqueous polyurethane coating (claimed) used for walls, furniture, metal tool surface, plastics, glass, paper and textile. ADVANTAGE - The coating is environment-friendly, and has low cost. DETAILED DESCRIPTION - A graphene modified flame retardant and light resistant aqueous polyurethane coating is prepared by: (A) adding 2.2 g 3-hydroxyl-7-methoxy-2-naphthoic acid, 4.1 g sodium carboxymethyl cellulose, 1.6 g ethanol, 0.6 g magnesium ethoxide, 5.3 g zinc acetate, 4.5 g diethanolamine and 3.2 g N-bromosuccinimide into 30 ml methyl ethyl ketone and 2 ml sulfonyl chloride, reacting at 90 degrees C for 3 hours, distilling solvent, cooling and filtering, washing filter cake with hot potassium bicarbonate solution, water washing to neutral, drying, and re-crystallizing using tetrahydrofuran with methanol and acetone to obtain powder catalyst; (B) stirring 3 g sodium sulfite, 0.9 g sodium metasulfite, 3.5 g trimeric sodium phosphate, 6.2 g tea polyphenol, 4.5 g citric acid and 1.3 g dibutyl hydroxy toluene at 60 degrees C for 1 hour, adding 4.2 g aluminum carbonate and 1.6 g aluminum stearate, mixing at 70 degrees C for 2 hours, adding 2.5 g methyltriethoxysilane and 3.2 g dimethyl formamide, and stirring at 80 degrees C for 3 hours to obtain light fastness agent; (C) adding 0.05 g graphene sheet with 400 ml concentrated sulfuric acid, 0.4 g 4-(diphenylamino)phenylboronic acid and 0.3 g 3,4,5-trifluorobenzene boric acid, mixing, reacting at 70 degrees C, condensing and refluxing for 3 hours at 500 W and 100 KHz, diluting using 450 mL deionized water, filtering through 0.2 mu m microporous filtering film, washing using deionized water to neutral, drying at 80 degrees C for 8 hours, and grinding to fine powder to obtain carboxylated graphene sheets; (D) adding 0.6 g (A) and 80 g polytetrahydrofuran diol with 40 g isophorone diisocyanate into 500 ml four-mouth flask stirring paddle, reacting to 70 degrees C 1 hour, adding 0.2 g 2-sulfobenzoic acid anhydride and 0.05 g (C), and reacting to 80 degrees C for 2 hours to obtain polyurethane pre-polymer A; and (E) reacting with 1.2 g amino benzene sulfonic acid and 20 g acetone, reacting to 75 degrees C for 2 hours, adding 1 g 2,4,6-trihydroxybenzoic acid and 1.2 g (B), reacting to 85 degrees C for 0.5 hours, adding 12 g triethylamine, reacting for 30 minutes, adding 110 g water, and stirring to emulsify. The graphene is chemical vapor deposited to length of 0.1-10 mu m, width of 0.1-10 mu m, thickness of 1-10 nm, purity of 99.5 wt.% and specific surface area of 500-2600 m2/g.