▎ 摘　　要

NOVELTY - Producing graphene heat-dissipating plastic particles involves: (S1) selecting graphite, quartz powder, porcelain powder, hexagonal boron nitride, nano aluminum oxide, silicon micropowder and epoxy resin; (S2) preparing graphene; (S3) introducing hexagonal boron nitride into the reaction kettle, then introducing the protective gas into the kettle, converting the hexagonal boron nitride into a molten state in the kettle, then taking out the mixture, guiding quartz powder into the kettle and converting the quartz powder into a molten state and taking out; (S4) introducing the molten hexagonal boron nitride and quartz sand obtained in step (S3) into a mixing drum, mixing to form a mixture, then taking out the mixture, adding purified water to the drum, then introducing the prepared graphene into the drum, followed by adding nano-aluminum oxide, porcelain powder, silicon micropowder and liquid epoxy resin and stirring to form a mixed liquid; and (S5) spray drying the mixed liquid. USE - The method is useful for producing graphene heat-dissipating plastic particles. ADVANTAGE - The method enables economical production of the graphene heat-dissipating plastic particles in an environmentally-friendly manner. DETAILED DESCRIPTION - Producing graphene heat-dissipating plastic particles involves: (S1) selecting a certain amount of graphite, quartz powder, porcelain powder, hexagonal boron nitride, nano aluminum oxide, silicon micropowder and epoxy resin; (S2) putting graphite into a reaction kettle, then introducing protective gas into the reaction kettle, where the protective gas is helium, then opening the reaction kettle, heating and expanding the graphite in the reaction kettle to form an expanded graphite, stopping heating the interior of the reaction kettle after graphite is expanded, then stopping the introduction of the protective gas into the reaction kettle, opening the reaction kettle to overflow the gas inside the reaction kettle, taking out the expanded graphite, stripping graphite into an aqueous solution, adding 1 mg purified water to the 1 mm graphite, then ultrasonically treating the aqueous graphite solution for a period of time to obtain a graphene suspension, freezing the graphene suspension liquid to be below a freezing point, and then placing in a dryer for drying to form graphene; (S3) introducing hexagonal boron nitride into the reaction kettle, then introducing the protective gas into the reaction kettle, where the protective gas is argon, controlling the temperature in the reaction kettle at 2900-3200 degrees C, converting the hexagonal boron nitride into a molten state in the reaction kettle, then taking out the mixture, guiding quartz powder into the reaction kettle, controlling the temperature of the reaction kettle at 1600-1800 degrees C, converting the quartz powder into a molten state and taking out; (S4) introducing the molten hexagonal boron nitride and quartz sand obtained in step (S3) into a mixing drum, uniformly mixing to form a mixture, then taking out the mixture, adding an appropriate amount of purified water to the mixing drum, then introducing the prepared graphene into the mixing drum, followed by adding nano-aluminum oxide, porcelain powder, silicon micropowder and liquid epoxy resin, stirring, then pouring the mixture prepared above into the mixing drum, continuously stirring for 30-35 minutes, mixing the substances in the mixing drum to form a mixture, and using quartz powder, porcelain powder, nano-aluminum oxide and silicon micropowder as a filler to improve the strength, the thermal conductivity and the heat dissipation capacity of the heat dissipating plastic particles; and (S5) adjusting the size of a spray hole of a spray head in a spray dryer according to the particle size of the designed plastic particles, then adjusting the pressure and flow rate of the feed pump according to the process conditions, and introducing the mixed liquid obtained in step (S4) into a spray dryer for spray drying.