▎ 摘　　要

NOVELTY - Preparation of nano-thermally-conductive composite material involves (i) adding silver chloride, water, aqueous ammonia, glucose and polyvinylpyrrolidone to a reaction kettle, mixing quickly and uniformly, reacting at 45-70℃ for 6-72 hours, centrifuging, ultrasonically-washing with 75% ethanol aqueous solution, drying, washing with ethanol and drying to obtain silver nanowires, (ii) adding polyacrylic acid, 1-ethyl-3-methylimidazolium carbonate, ethanol and nano-silver supported graphene to a hydrothermal reaction kettle, maintaining at 95-110℃ for 0.5-6 hours, vacuum-distilling, washing with ethanol and drying to obtain 1-ethyl-3-methylimidazolium polyacrylate, and (iii) adding polyester hot-melt adhesive, 1-ethyl-3-methylimidazolium polyacrylate, graphene, silver nanowires, rosin resin and maleic anhydride to a mixer, mixing at 45 rpm and at 220-239℃ for 0.1-2 hours under the protection of nitrogen, extruding using an extruder and granulating at a temperature of 220-239℃. USE - Preparation of nano-thermally-conductive composite material. ADVANTAGE - The nano-thermally-conductive composite material has excellent thermal conductive performance, and is prepared by changing the reactant raw material and technique mode, and has a slight ionization activity in water, using the dissolution balance, the slight ionization activity of the silver chloride in water, and the slight ionization activity of the nano-silver supported graphene in water. The method of preparing the material is simple and cost-effective, and provides the material with excellent dispersibility of nano-silver supported graphene. The material is prepared with high yield. DETAILED DESCRIPTION - Preparation of nano-thermally-conductive composite material involves (i) adding silver chloride, water, aqueous ammonia, glucose and polyvinylpyrrolidone in a mass ratio of 10:180-230:23-55:51-76:100-160 to a reaction kettle, mixing quickly and uniformly, maintaining the stirring speed at 20 rpm, reacting at 45-70℃ for 6-72 hours, centrifuging the reaction product, ultrasonically-washing with 75% ethanol aqueous solution for five times, drying, washing with ethanol for three times and drying to obtain silver nanowires, (ii) adding polyacrylic acid, 1-ethyl-3-methylimidazolium carbonate, ethanol and nano-silver supported graphene in a mass ratio of 30:51-70:190-260:8-14 to a hydrothermal reaction kettle, maintaining the hydrothermal reaction temperature at 95-110℃ for 0.5-6 hours, transferring the reaction product to a vacuum reaction kettle, vacuum-distilling, washing with ethanol for five times and drying to obtain 1-ethyl-3-methylimidazolium polyacrylate, and (iii) adding polyester hot-melt adhesive, 1-ethyl-3-methylimidazolium polyacrylate, graphene, silver nanowires, rosin resin and maleic anhydride in a mass ratio of 100:13-28:8-25:9-20:3-8:2-7 to a mixer, mixing at 45 rpm and at 220-239℃ for 0.1-2 hours under the protection of nitrogen, extruding using an extruder and granulating at a temperature of 220-239℃.