Graphene-modified heat conduction film
A technology of graphene modification and heat-conducting film, which is applied in the direction of inorganic chemistry, non-metallic elements, carbon compounds, etc., can solve the problems of poor thermal conductivity and low mechanical properties of films, and achieve increased strength, improved mechanical properties and thermal conductivity, and high The effect of chemical reactivity
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Example Embodiment
[0026] The preparation process of the thermally conductive film is an existing film preparation process, such as blow molding, cast molding or calender molding.
[0027] Graphene raw materials, graphene powder and graphene slurry are commercially available and purchased from Ningbo Moxi Technology Co., Ltd.
[0028] Graphene is a single-layer sheet structure, or the graphene has 2-50 layers, and the layers are carbon atoms sp 2 The hybrid orbitals form a hexagonal honeycomb lattice, with carbon atoms between layers bonded by π bonds; the mass ratio of carbon elements to non-carbon elements is greater than 4:1, and non-carbon elements are selected from fluorine, nitrogen, oxygen, sulfur, hydrogen, and chlorine One or more of, bromine and iodine.
[0029] Graphene can also contain modified graphene with various functional groups, such as one or more of hydroxyl, carboxyl, carbonyl, nitrogen, and amino.
Example Embodiment
[0030] Example 1
[0031] Put 10% of polyimide emulsion, 80% of graphene slurry, 5% of binder acrylic resin, 0.5% of auxiliary agent and solvent ethanol and deionized water 4.5% with a volume ratio of 1:2 into the mixer gradually , Stir thoroughly, put it in an oven, gradually increase the temperature to 250°C, dry for 1 hour, and stretch in both directions to obtain a film with a length of 10mm, a width of 10mm, and a thickness of 0.05mm. Then, under the protection of the atmosphere, sintered at 1000°C for 1h carbonization, and finally sintered at 2800°C for 2h graphitization in a graphitization furnace to obtain a graphene-modified thermal conductive film.
Example Embodiment
[0032] Example 2
[0033] Combine 10% polyimide emulsion with a 1:2 mass ratio of binder acrylic resin and 10% epoxy resin, 65% graphene slurry, 5% additives, and solvent ethanol with a volume ratio of 1:2. Gradually put 10% acetic acid into the reaction kettle and fully stir for 3 hours to obtain a mixed solution, and then degas the mixed solution. The degassed mixed liquid was cast on a stainless steel belt and dried at 280℃ to obtain a length of 10mm, a width of 10mm, and a thickness. 0.05mm film. Then, under the protection of the atmosphere, sintered at 800°C for 2h carbonization, and finally sintered at 2500°C for 1h graphitization in a graphitization furnace to obtain a graphene-modified thermal conductive film. Among them, the auxiliary agent is a dispersant, a modifier and a coupling agent, the dispersant is polyethylene wax, the modifier is nano-zirconia, nano-titanium dioxide and boron nitride, and the coupling agent is a silane coupling agent and dispersant. The mass...
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