▎ 摘　　要

NOVELTY - Fire-retardant and flame-retardant coating comprises 20-40 pts. wt. polyether glycol, 3-5 pts. wt. 2,2-dimethylolpropionic acid, 5-10 pts. wt. toluene diisocyanate, 1-3 pts. wt. hydroxyethyl cellulose, 1-3 pts. wt. triethylamine, 1 pt. wt. modified graphene oxide, 0.5 pt. wt. flame retardant, 3 pt. wt. solvent, 0.1 pt. wt. catalyst, 1-3 pts. wt. chain extender and deionized water. The flame retardant is prepared by (a) mixing rhodamine B and ethanol, dripping ethylenediamine, refluxing, detecting reaction, cooling, evaporating to obtain a concentrate and drying to obtain an intermediate (I), (b) mixing hexachlorocyclotriphosphazene and tetrahydrofuran, adding 4-hydroxyphenylboronic acid, reacting, distilling, dissolving the crude product with dichloromethane and distilling to obtain an intermediate (II), and (c) mixing intermediate (II) and dimethyl sulfoxide, stirring, adding e.g. lithium chloride, heating to obtain an intermediate (III), adding intermediate (I) and reacting. USE - The coating is useful for surface of plastic parts (claimed). ADVANTAGE - The coating has excellent barrier properties, flame retardancy and fire resistance, and is rich in nitrogen, phosphorus and boron. DETAILED DESCRIPTION - Fire-retardant and flame-retardant coating comprises 20-40 pts. wt. polyether glycol, 3-5 pts. wt. 2,2-dimethylolpropionic acid, 5-10 pts. wt. toluene diisocyanate, 1-3 pts. wt. hydroxyethyl cellulose, 1-3 pts. wt. triethylamine, 1 pt. wt. modified graphene oxide, 0.5 pt. wt. flame retardant, 3 pt. wt. solvent, 0.1 pt. wt. catalyst, 1-3 pts. wt. chain extender and 10-20 pts. wt. deionized water. The flame retardant is prepared by (a) adding rhodamine (B) and absolute ethanol into the reaction kettle, stirring for 10 minutes at room temperature, using a constant pressure dropping funnel, dripping ethylenediamine into the reaction kettle at a dropping rate of 1-3 drops/second, stirring and refluxing the resulting mixture for 24 hours at 80 degrees C, detecting the reaction by thin layer chromatography, cooling to room temperature, evaporating under reduced pressure to remove the absolute ethanol to obtain a concentrate, dripping hydrochloric acid solution to the concentrate to adjust to a pH of 9-10, finally filtering under reduced pressure, washing and drying the precipitate to obtain an intermediate (I), (b) adding hexachlorocyclotriphosphazene and tetrahydrofuran to the 4-necked flask, stirring until the solids are dissolved, adding 4-hydroxyphenylboronic acid to the 4-necked flask, reacting at reflux temperature for 6-8 hours, naturally cooling the reaction to room temperature, suction filtering and collecting the filtrate, distilling under reduced pressure to remove tetrahydrofuran to obtain a crude product, dissolving the crude product with dichloromethane, washing and drying, filtering and distill under reduced pressure to obtain an intermediate (II), and (c) adding intermediate (II) and dimethyl sulfoxide into a round bottom flask, stirring for 10 minutes, adding allyl ethylene glycol and lithium chloride to the round bottom flask, heating at 50 degrees C, reacting under stirring for 2-4 hours to obtain the mixed solution of an intermediate (III), adding an intermediate (I) into a round-bottomed flask, passing nitrogen, heating at 70 degrees C, dripping triethylamine to the round-bottomed flask through a constant pressure dropping funnel, stirring for 6 hours, reacting, cooling to room temperature and transferring the reaction product to deionized water, precipitating a large amount of solids, and drying the filter cake in an oven at 50 degrees C for 5-10 hours.