A kind of preparation method of concentrated graphene oxide solution and thermal conductive film

Abstract

The invention discloses a method for preparing a concentrated graphene oxide solution and a heat conduction film. A specific embodiment of the preparation method of the concentrated graphene oxide solution includes: forming a negative charge on the surface of graphene oxide in the graphene oxide aqueous solution; utilizing a metal salt to colloidize the negatively charged graphene oxide aqueous solution to form a metal-doped oxide Graphene colloid: the metal-doped graphene oxide colloid is concentrated and separated to obtain a metal-doped graphene oxide aqueous solution, that is, a concentrated graphene oxide solution. This embodiment embodiment of the present invention increases the concentration of graphene oxide by preparing a metal-doped graphene oxide aqueous solution; it overcomes the problem that the concentration of graphene oxide in the prior art is low and difficult to increase. Using concentrated graphene oxide solution to prepare thermally conductive film can not only reduce the energy consumption of water treatment in later stage, but also can greatly improve the longitudinal thermal conductivity of thermally conductive film, so as to obtain thermally conductive film with high thermal conductivity.

Description

technical field [0001] The invention relates to the technical field of material preparation, in particular to a method for preparing a concentrated graphene oxide solution and a heat conduction film. Background technique [0002] In solid materials, phonons and electrons are the key pathways for heat transfer. The thermal conductivity of metals mainly depends on the high-concentration electron transfer process, and among all metals, metallic silver has the highest thermal conductivity (K=429W / mK), but this thermal conductivity is still not ideal in practical applications. The thermal conductivity of non-metals mainly depends on the propagation rate of phonons. The thermal conductivity of different elements is quite different, and the thermal conductivity of the same element is also different due to the different lattice arrangement. For example, diamond and graphite, so how to get from non-metallic materials It is still a big challenge to obtain thermally conductive materia...

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Problems solved by technology

The lateral thermal conductivity of this product is 600-1800W / mK, and the longitudinal thermal conductivity is about 3W / mK, but the preparation process is harsh and the cost is high, which is not conducive to large-scale production

[0007] Existing thermal conductive films are usually prepared by coating graphene oxide into a film, but since the concentration of graphene oxide aqueous solution is lower than 0.8%, it needs to consume a lot of energy to evaporate excess water during the film forming process, thereby The energy consumption of graphene film preparation is too high, and the lower concentration will also lead to thinner graphene film thickness, so that the heat conduction flux cannot meet the current 5G heat dissipation application

In addition, the high thermal conductivity of graphene is mainly reflected in the plane, but due to the low thermal conductivity perpendicular to the graphene plane, the overall thermal conductivity of graphene is weak.

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