Heat-dissipating film, and its production method and apparatus
OwnerSeiji KAGAWAinventor
Life of this patent
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Abstract
The present invention relates to a heat-dissipating film. The heat-dissipating film comprises a heat-conductive layer comprising fine graphene particles and carbon nanotube uniformly dispersed, a mass ratio of the carbon nanotube to the total of the fine graphene particles, wherein the carbon nanotube is 0.05-0.2, and the fine graphene particles are substantially aligned with the heat-conductive layer, and the heat-conductive layer has a density of 1.9 g/cm3 or more and thermal conductivity of 600 W/mK or more.
Claims9
A method for producing a heat-dissipating film comprising a heat-conductive layer comprising fine graphene particles and carbon nanotube uniformly dispersed, a mass ratio of said carbon nanotube to the total of said fine graphene particles and said carbon nanotube being 0.05-0.2, and said fine graphene particles being substantially aligned with said heat-conductive layer, comprising the steps of
- (1) sandwiching a mixture layer comprising said fine graphene particles and said carbon nanotube at said mass ratio, and further comprising a binder resin at a mass ratio of 0.01-0.1 per the total amount of said fine graphene particles and said carbon nanotube, with a pair of first plastic films, to form a laminated film;
- (2) heat-pressing said laminated film to densify said mixture layer;
- (3) burning said mixture layer exposed by peeling said first plastic films to remove said binder resin;
- (4) pressing the burnt layer to provide a densified heat-conductive layer;
- and
- (5) covering said densified heat-conductive layer with second plastic films or an insulating resin.
An apparatus for producing a heat-dissipating film, comprising (a) rolls for conveying a pair of first plastic films;
- (b) at least one nozzle for applying a dispersion comprising fine graphene particles, carbon nanotube and a binder resin to each first plastic film plural times;
- (c) a heater for drying said dispersion in every application;
- (d) rolls for laminating a pair of said first plastic films each having a mixture layer comprising said fine graphene particles, said carbon nanotube and said binder resin, with said mixture layers inside;
- (e) heating rolls for heat-pressing the laminated film;
- (f) rolls for peeling said first plastic films from said laminated film;
- (g) a burner or a furnace for burning the exposed mixture layer;
- (h) pressing die or rolls for densifying the burnt layer to provide a heat-conductive layer;
- and (i) rolls for covering said heat-conductive layer with second plastic films or an insulating resin.
Dependencies are inferred from the claim text.