▎ 摘　　要

NOVELTY - Flexible multilayer graphene composite film comprises phase change layer and heat dissipation layer, where heat dissipation layer is multilayer graphene film and phase change layers is two layers. The heat dissipation layer is fixed between the two phase change layer by adhesive. USE - Flexible multilayer graphene composite film. ADVANTAGE - The flexible multilayer graphene composite film has heat conducting radiating structure, good heat radiation effect and improves service life. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: (1) method for preparing multilayer graphene film, which involves placing a silicon carbide substrate to chemical vapor deposition reaction chamber, controlling the absolute vacuum degree of the chemical vapor deposition reaction chamber at 1200-1400 degrees C under not greater than 104 Pascal, growing 4-8 micron silicon carbide on the surface of silicon carbide epitaxial layer, controlling the temperature of the chemical vapor deposition reaction chamber at 1000 degrees C, heating from 1600 degrees C to 1000 degrees C under an inert gas atmosphere, carrying out decomposition and recombination of silicon carbide epitaxial layer structure to obtain multilayer graphene film on the silicon carbide substrate, put coagulating solution in an inert gas atmosphere with heating rate 10-15 degrees C per minutes at 800-1200 degrees C for 1-2 hours, heating to heating rate 5-8 degrees C per minutes at 1800-2200 degrees C for 2-3 hours under an inert gas atmosphere, heating to heating rate 1-3 degrees C per minutes at 2800-3200 degrees C for 3-4 hours under an inert gas atmosphere to obtain aerogel film, heating with concentration of 1-100 gram per milliliter paraffin in methylene dichloride solution, allowing to stand for 1-10 hours, drying in vacuum oven at 20-40 degrees C to obtain phase change layer; (2) a method for preparing coagulating solution, which involves weighing 0.5-2.4 pts. wt. zinc oxide, 5-18 pts. wt. sodium citrate, 3-9 pts. wt. glycerol, 2.2-4.5 pts. wt. butanediamine, 15-32 pts. wt. vinyl acetate-ethylene copolymer emulsion and 22-38 pts. wt. dioctyl phthalate, mixing to obtain mixed solution, adding expanded graphite, stirring for 2-3 hours to obtain coagulating solution, where expanded graphite and mixed solution are 0.1 wt.% and 1.3 wt.% respectively; and (3) a method for preparing adhesive mixing 15-28 pts. wt. polyvinylidene fluoride, 3-9 pts. wt. silica sol, 10-16 pts. wt. naphthenic oil and 8-16 ethylene glycol, stirring at 60-80 degrees C for 1-2 hours to obtain adhesive.