▎ 摘　　要

NOVELTY - Preparing flame-retardant modified polycarbonates-acrylonitrile butadiene styrene alloy involves mixing the flame retardant polycarbonates, lanthanum nitrate aqueous solution having molar concentration of 0.1mol/L and sodium stannate aqueous solution having molar concentration of 0.1mol/L and stirring uniformly to obtain mixture. The graphene oxide dispersion liquid is prepared of the concentration of 0.8-1.4mg/mL. The obtained mixture and graphene oxide dispersion liquid are mixed in mass ratio of 2-3:1 and stirred uniformly. USE - Method for preparing flame-retardant modified polycarbonates-acrylonitrile butadiene styrene alloy (claimed). ADVANTAGE - The method enables to prepare flame-retardant modified polycarbonates-acrylonitrile butadiene styrene alloy improves the flame retarding efficiency that reaches to UL-94V-0 level. DETAILED DESCRIPTION - Preparing flame-retardant modified polycarbonates-acrylonitrile butadiene styrene alloy involves mixing the flame retardant polycarbonates, lanthanum nitrate aqueous solution having molar concentration of 0.1mol/L and sodium stannate aqueous solution having molar concentration of 0.1mol/L and stirring uniformly to obtain mixture. The graphene oxide dispersion liquid is prepared of the concentration of 0.8-1.4mg/mL. The obtained mixture and graphene oxide dispersion liquid are mixed in mass ratio of 2-3:1 and stirred uniformly. The saturated ammonia aqueous solution is used to adjust the pH of obtained mixture to 10-12. The obtained product is stirred and reacted for 3-5 hours at room temperature and allowed to stand for 24-48 hours under the water bath at 80-90 degrees C. The obtained product is stirred till the liquid is completely evaporated. The obtained product is distilled and washed with water to neutral. The obtained product is subjected to vacuum drying and grinding, and sieved by 200-400 meshes sieve. The obtained product is heated to 460-540 degrees C at a rate of 5-7 degrees C per minute under the protection of nitrogen for 1-2 hours. The obtained product is again heated at a rate of 4-6 degrees C per minute at 720-780 degrees C for 1.5-2.5 hours. The obtained product is reduced to 340-390 degrees C at a rate of 3-5 degrees C per minute in the helium gas shield for 0.5-1 hours. The obtained product is heated to 800-850 degrees C at a rate of 2-4 degrees C per minute for 2-3 hours. The obtained product is reduced to 360-670 degrees C at a rate of 1-3 degrees C per minute under the protection of carbon dioxide for 1-2 hours. The obtained product is again reduced to 240-280 degrees C at a rate of 2-4 degrees C per minute under the protection of carbon dioxide for 0.5-1 hours. The obtained product is cooled to room temperature to obtain graphene oxide-coated tin acid lanthanum. The bisphenol A and dimethyl carbonate are mixed in molar ratio of 1:2 under normal pressure, and added 1-2 monobutyl tin oxide and 1-2 of triphenylphosphine under oil bath to 180-200 degrees C. The obtained product is stirred and reacted for 6-9 hours under the protection of nitrogen. The obtained product is decompressed and distilled to obtain light-yellow doped bisphenol A dibutyl carbonate at 130-150 degrees C. The bisphenol A and dimethyl carbonate are mixed in molar ratio of 3-4:1 and added graphene oxide-coated tin acid lanthanum under ultrasonic dispersing for 1-2 hours. The obtained product is decompressed and distilled at 130-150 degrees C to obtain coarse polycarbonate polymerization. The obtained product is dissolved in dichloromethane and precipitated with ethanol and filtered. The obtained product is subjected to vacuum drying to constant weight to obtain desired flame-retardant sodium-aluminium oxide loaded graphene. The graphene oxide dispersion liquid is added to the 10-15 pts. wt. sodium-aluminium oxide loaded graphene and stirred uniformly. The obtained product is dispersed ultrasonically for 20-30 minutes and added sodium bicarbonate in according to mol ratio of 16:1. The obtained product is stirred uniformly and adjusted the pH to 9-10 using 10 wt.% sodium hydroxide solution. The obtained product is heated under water bath to 80-90 degrees C and stirred for 2-4 hours. The obtained product is cooled to room temperature and centrifuged at the speed of 8000-10000 revolution per minute for 20-40 minutes. The obtained product is washed and precipitated with distilled water to neutral. The obtained product is washed with 95 vol.% ethanol solution for 3-4 times. The obtained product is heated to 70-80 degrees C for 24-36 hours to obtain sodium-aluminium loaded with graphene oxide. The butadiene, tert-dodecyl mercaptan, disproportionated disproportionaterosin, potassium carbonate and water are added in the ratio of 3-5:0.01-0.02:0.1-0.2:0.02-0.03:5-7, and added water. The obtained product is stirred uniformly and vacuumized by replacing with nitrogen for three. The obtained product is added to butadiene for pre-emulsifying for 10-15 minutes at 60-70 degrees C. The obtained product is stirred for 30-40 minutes and cooling to obtain polybutadiene latex. The obtained granules, sodium-aluminium loaded with graphene oxide flame retardant are mixed at 60-80 degrees C for 5-10 minutes and added into double screw extruder for extruding and pelleting for the second time to obtain flame-retardant modified polycarbonates-acrylonitrile butadiene styrene alloy.