Preparation method of heat conduction film

Abstract

The invention provides a preparation method of a heat conduction film. The preparation method comprises the following steps: pre-polymerizing an organic polymer monomer and a radical initiator in an aqueous solution to obtain a first product; adding graphite oxide into the first product, and carrying out dispersion treatment on the graphite oxide to obtain a second product; adding an inorganic acid into the second product to adjust the pH value of the mixed solution to be less than or equal to 3 to flocculate the second product, and separating the obtained flocculate to obtain organic polymermodified graphite oxide precursor slurry; and coating the surface of a base material with the slurry, and drying; after drying, stripping the dried substance on the surface of the base material to obtain a slurry dry film; carrying out heat treatment and reduction treatment on the slurry dry film to obtain a thermal reduction film; heating the thermal reduction film to 1000-1200 DEG C at a first heating rate in an inert atmosphere, heating the thermal reduction film to 2600-3000 DEG C at a second heating rate after heat preservation is completed, and obtaining a high-temperature carbonized film after heat preservation is completed; and carrying out physical shaping treatment on the high-temperature carbonized film to obtain the heat conduction film.

Description

Technical field[0001]The invention belongs to the technical field of thermal conductive film preparation, and specifically relates to a method for preparing a graphene thermal conductive film.Background technique[0002]As the electronics industry, new energy vehicles, LED and other industries have increasingly higher requirements for safe heat dissipation, traditional thermal interface materials are gradually being replaced by new thermal materials due to their own limitations. Graphene is a material with a single-atom layered structure composed of carbon atoms in a hexagonal honeycomb lattice. As a new type of two-dimensional nano-carbon material, graphene has excellent properties and characteristics, such as electrical properties (electron mobility at room temperature) Up to 15000cm2·V-1·S-1), mechanical properties (in ideal conditions, Young’s vector 1TPa, intensity 130GPa), optical properties (visible light region transmittance of more than 97%), high specific surface area (2630m...

AI Technical Summary

Problems solved by technology

In this way, graphite oxide is dried and exfoliated into few-layer graphene powder. The disadvantage of this preparation method is that the high-temperature exfoliation temperature is high, the energy consumption is large, and after thermal exfoliation, the dispersibility of the product is poor, and the graphene powder is dispersed. It has been agglomerated before, and it is impossible to separate the graphene aggregate powder after redispersion, which is not conducive to the preparation of subsequent slurry.