▎ 摘　　要

NOVELTY - Graphene and anhydrous ethanol are stirred, to obtain graphene/ethanol mixed slurry. The polyethylene terephthalate is corona treated to form corona-treated polyethylene terephthalate film. The uniformly-mixed graphene/ethanol slurry is coated on corona-treated polyethylene terephthalate film, dried, hot-rolled, rolled and trimmed, to obtain polyethylene terephthalate/graphene composite heat-conducting film with uniform size. The graphene is prepared from microcrystalline graphite. USE - Preparation of polyethylene terephthalate/graphene composite thermal conductive film (claimed). ADVANTAGE - The method enables preparation of polyethylene terephthalate/graphene composite has excellent thermal conductivity. DETAILED DESCRIPTION - Graphene is placed in a vacuum mixer. Anhydrous ethanol is added to mixer and stirred, to obtain graphene/ethanol mixed slurry. The polyethylene terephthalate is corona treated with corona machine to form corona-treated polyethylene terephthalate film with thickness of 30 mu m. The uniformly-mixed graphene/ethanol slurry is coated on corona-treated polyethylene terephthalate film using bench coater such that the blade height is 20-40 mm. The coated polyethylene terephthalate film is dried. The dried polyethylene terephthalate film is hot-rolled by roll mill, to obtain polyethylene terephthalate-based graphene thermal film. The polyethylene terephthalate-based graphene thermal film is rolled and trimmed, to obtain polyethylene terephthalate/graphene composite heat-conducting film with uniform size. The graphene is prepared from microcrystalline graphite by taking microcrystalline graphite raw materials, crushing and grinding microcrystalline graphite raw materials to obtain microcrystalline graphite powder having particle size of 300-400 mesh, subjecting microcrystalline graphite powder to intercalation treatment (t1), to intercalation treatment (t2) and high-temperature puffing treatment, and expanding microcrystalline graphite, to obtain secondary-expanded microcrystalline graphite, mixing secondary expanded microcrystalline graphite with stripping solution, diluting mixture and placing diluted mixture in ultrasonic reaction device, to obtain stripped material, pressure-filtering and separating stripping material, collecting graphite filter cake and recycling stripping liquid and cleaning graphite filter cake. The stripping solution comprises graphene quantum dot and having dilution factor of 5 times. The ultrasonic reaction apparatus has temperature of 50 degrees C, frequency of 25000 Hz, flow rate of 5 m3/hour, circulation stirring speed of 2000 rpm and ultrasound dispersion of 2 hours. The cleaning is carried out using deionized water and cleaning times is 3-5 times.