Method for preparing natural graphite radiating film from graphite oxide

[0022] Select 70 mesh flake graphite, and blend flake graphite with concentrated sulfuric acid and potassium permanganate in a mass ratio of 1:50:1. o After reacting at C for 1 h, the intercalated graphite obtained is blended with concentrated sulfuric acid and potassium permanganate in a ratio of 1:200:3 in mass ratio of flake graphite to concentrated sulfuric acid to potassium permanganate, 35 o C reacted for 5 hours, after washing, the graphite oxide was obtained by shaking in the aqueous solution to prepare a slurry with a concentration of 3 wt%, and coating it into a wet film with a thickness of 5 mm. o Dry film at C for 48 h to obtain dry film, dry film under the protection of high purity nitrogen 1000 o C carbonization treatment for 1 h, heating rate is 2 o C min -1 , After 10 o C min -1 To 3000 o C is graphitized for 3 h, and the resulting film is rolled at 5 MPa to be smooth.

[0023] The thickness of the natural graphite heat dissipation film obtained is 20 μm, and the in-pla

[0025] Select 70 mesh flake graphite, and blend flake graphite with concentrated sulfuric acid and potassium permanganate in a mass ratio of 1:50:1. o After reacting at C for 1 h, the intercalated graphite obtained is blended with concentrated sulfuric acid and potassium permanganate in a ratio of 1:200:3 by mass ratio of flake graphite to concentrated sulfuric acid to potassium permanganate, 35 o C reacted for 5 hours, after washing, the graphite oxide was obtained by shaking in the aqueous solution to prepare a slurry with a concentration of 3 wt%, and coating it into a wet film with a thickness of 5 mm. o Dry film at C for 48 h to get dry film, dry film at 90 o Soak in hydroiodic acid at C for 1 h, then at 10 o C min -1 To 3000 o C is graphitized for 3 h, and the resulting film is calendered at 5MPa to be smooth.

[0026] The thickness of the natural graphite heat dissipation film obtained is 22μm, and the in-plane thermal conductivity measured by the laser heat conduction method is

[0028] Select 150 mesh flake graphite, flake graphite and concentrated sulfuric acid and potassium permanganate are blended in a mass ratio of 1:50:1. o After reacting at C for 1 h, the intercalated graphite obtained is blended with concentrated sulfuric acid and potassium permanganate in a ratio of 1:200:3 by mass ratio of flake graphite to concentrated sulfuric acid to potassium permanganate, 35 o C reacted for 5 hours, after washing, the graphite oxide was obtained by shaking in the aqueous solution to prepare a slurry with a concentration of 3 wt%, and coating it into a wet film with a thickness of 5 mm. o Dry film at C for 48 h to obtain dry film, dry film under the protection of high purity nitrogen 1000 o C carbonization treatment for 1 h, heating rate is 2 o C min -1 , After 10 o C min -1 To 3000 o C is graphitized for 3 h, and the resulting film is rolled at 5 MPa to be smooth.

[0029] The thickness of the natural graphite heat dissipation film obtained is 20 μm, and the in-p