▎ 摘　　要

NOVELTY - Preparing efficient composite heat sink electronic product comprises e.g. (i) adding graphite flake and stripping liquid injection into kettle body, stirring to obtain material, heating and reacting, discharging upper suspension into the storage tank, centrifuging, vacuum filtering and freeze-drying, (ii) solid-phase mixing solid phase nitrogen precursor and graphene powder to obtain mixture, and sintering the mixture, and (iii) mixing nitrogen-doped graphene prepared with polymer binder, and drying. USE - The method is useful for preparing efficient composite heat sink electronic product (claimed). ADVANTAGE - The method improves structural integrity of carbon and carbon in graphene simply and effectively, has low cost and is easy to obtain, and can effectively reduces manufacturing costs. DETAILED DESCRIPTION - Preparing efficient composite heat sink electronic product comprises (i) adding 99% purity of and 100-300 mu m particle size of graphite flake and stripping liquid injection into kettle body containing stirrer, stirring for uniformly mixing to obtain material, where the composition of the stripping liquid is 90 pts. wt. ethylene glycol, 40 pts. wt. polyacrylate, 2 pts. wt. silica/poly(methyl methacrylate-styrene) double-shell composite microspheres, 1 pts. wt. lithium chloride, the particle size of silica/poly(methyl methacrylate-styrene) double-shell composite microspheres is 50 microns, the silica core has particle size of 20 nm, shell thickness of 10 nm, the number of average molecular weight of the polyacrylate is greater than 100000, the weight ratio of the graphite scale and stripping liquid is 1:3, heating the kettle body, keep the kettle body temperature to 90 degrees C, and pressure to 3 atmosphere, stirring at shaft speed of 1500 revolution/minute and reacting for 3 hours, discharging the upper suspension into the storage tank through the discharge port, allowing to stand for more than 24 hours to obtain initial product, transferring the obtained graphene suspension in the storage tank into a centrifuge, centrifuging at speed of 1500 revolution/minute for 1 hours, then collecting supernatant, vacuum filtering the filter cake in a vacuum filtration device, washing the resulting filter cake with distilled water, freeze-drying the filter cake in a freeze-drying device for more than 4 hours to obtain graphene powder, (ii) solid-phase mixing solid phase nitrogen precursor and graphene powder to obtain mixture, where the solid phase nitrogen source is hexamethylenetetramine, ammonium benzoate, ammonium carbonate, ammonium citrate tribasic-ammonium citrate dibasic, ammonium formate, melamine, 1-naphthonitrile, 2,3-naphthalenedicarbonitrile and 1,8-naphthalimide, the weight ratio of graphene and solid phase nitrogen precursor is 1:2-1:10, sintering the mixture at 500-700 degrees C for 4-7 hours to obtain nitrogen-doped graphene, and (iii) mixing the nitrogen-doped graphene prepared with polymer binder to obtain slurry mixture, applying the slurry mixture to at least one surface of metal substrate to obtain composite material, placing the composite material in a high-temperature oven and drying to obtain heat sink.