▎ 摘　　要

NOVELTY - Preparing a polyethylene terephthalate (PET)/graphene composite thermal conductive film involves placing graphene in a vacuum mixer, and adding anhydrous ethanol, stirring and filtering to obtain a mixed graphene/ethanol slurry. The polyethylene terephthalate (PET) film corona subjected to treatment and using a desktop coater to uniformly mixed with obtained graphene/ethanol slurry hanging coating applied to corona treated PET film, and blade height of 30-60mm. The coated PET film is dried, and subjected to hot-rolling by a roller press machine to obtain PET-based graphene thermal. USE - Method for preparing a polyethylene terephthalate (PET)/graphene composite thermal conductive film (claimed). ADVANTAGE - The method enables to prepare a polyethylene terephthalate (PET)/graphene composite thermal conductive film, which has high heat-conducting property, and high quality production. DETAILED DESCRIPTION - Preparing a polyethylene terephthalate (PET)/graphene composite thermal conductive film involves placing graphene in a vacuum mixer, and adding anhydrous ethanol, stirring and filtering to obtain a mixed graphene/ethanol slurry. The polyethylene terephthalate (PET) film corona subjected to treatment and using a desktop coater to uniformly mixed with obtained graphene/ethanol slurry hanging coating applied to corona treated PET film, and blade height of 30-60mm. The coated PET film is dried, and subjected to hot-rolling by a roller press machine to obtain a PET-based graphene thermal conductive film. The PET-based graphene heat-conducting film is subjected to rolling treatment and trimming to obtain a uniform size PET/graphene composite heat conducting film. The graphene is prepared from microcrystalline graphite by taking microcrystalline graphite raw material, and crushing to a particle size of 300 mesh microcrystalline graphite. The microcrystalline graphite powder first intercalation treatment, and subjected into first high temperature puffing treatment, and transferred into second intercalation treatment. The secondary expanded microcrystalline graphite obtained is mixed with a stripping solution, diluted and again placed in an ultrasonic reaction device to obtain a stripped material. The stripping material is subjected to filter press, separation, and then collect the graphite filter cake, where stripping liquid is recycled. The graphite filter cake is washed to obtain graphene, and stripping solution is a graphene quantum dot by dilution factor of 5 times. The ultrasonic reaction device is carried out at 50 degrees C under frequency of 25000 Hz, the flow rate is 5.0m3/hour, the circulating stirring speed is 2000 revolution per minute and dispersion for 2 hours to obtain the desired product.