▎ 摘　　要

NOVELTY - Preparing polyethylene terephthalate/graphene heat conductive film comprises e.g. (i) preparing graphene heat-dissipating slurry comprises (i.i) mixing graphene quantum dots, graphene and solvent and grinding and shearing ultrasonically to obtain composite slurry material; (i.ii) adding urea-formaldehyde resin, curing agent and carbon nanotubes to composite slurry material, stirring to obtain initial product of graphene heat-dissipating slurry; (i.iii) adding initial product of graphene heat-dissipating slurry, heat-conductive metal powder, antifoaming agent and antioxidant, stirring mixture, mixing uniformly to obtain graphene heat-dissipating slurry; (ii) performing corona treatment of PET using corona machine; (iii) coating mixed graphene heat-dissipating slurry on the corona-treated PET film by desktop applicator; (iv) drying coated PET film; (v) hot-pressing dried PET film to obtain PET-based graphene heat conductive film; and (vi) trimming PET-based graphene heat-conducting film. USE - The method is useful for preparing polyethylene terephthalate/graphene heat conductive film. ADVANTAGE - The method reduces thermal conductivity, improves heat radiation rate of thermal conductive film and improves heat dissipation performance of the thermal conductive film, reduces agglomeration between graphene and improve stability of graphene in heat-dissipating coating, does not produce harmful substances harmful to human body and is environmentally friendly. DETAILED DESCRIPTION - Preparing polyethylene terephthalate (PET)/graphene heat conductive film comprises (i) preparing graphene heat-dissipating slurry comprises (i.i) mixing graphene quantum dots, graphene and solvent and grinding and shearing ultrasonically with ultrasonic power of 1000-1200 W for 40-60 minutes to obtain composite slurry material; (i.ii) adding urea-formaldehyde resin, curing agent and carbon nanotubes to composite slurry material obtained in step (i.i), stirring at a speed of 1000-1200 rotations/minute for 2-4 hours to obtain initial product of graphene heat-dissipating slurry; (i.iii) adding initial product of graphene heat-dissipating slurry obtained in step (i.ii), heat-conductive metal powder, antifoaming agent and antioxidant, stirring mixture at a speed of 1200-1500 rotations/minute for 2-3 hours, mixing uniformly to obtain graphene heat-dissipating slurry, where graphene heat dissipating slurry comprises 6-12 pts. wt. graphene, 50-70 pts. wt. urea-formaldehyde resin, 12-30 pts. wt. graphene quantum dots, 2-5 pts. wt. heat conducting metal powder, 3-6 pts. wt. carbon nanotube, 12-24 pts. wt. solvent, 5-8 pts. wt. curing agent, 12-16 pts. wt. defoaming agent and 1-5 pts. wt. antioxidant; (ii) performing corona treatment of 30 mu m thick PET using corona machine; (iii) coating uniformly mixed graphene heat-dissipating slurry on the corona-treated PET film by desktop applicator and blade height is 10-50 mm; (iv) drying PET film coated in step (iii); (v) using roll press to hot-press dried PET film to obtain PET-based graphene heat conductive film; and (vi) trimming PET-based graphene heat-conducting film after rolling treatment. An INDEPENDENT CLAIM is also included for PET/graphene heat conductive film prepared by above mentioned method