Preparation method of thermally conductive film

Abstract

The invention provides a method for preparing a heat conduction film, comprising the following steps: prepolymerizing an organic polymer monomer and a free radical initiator in an aqueous solution to obtain a first product; adding graphite oxide to the first product and dispersing the graphite oxide processing to obtain a second product; adding an inorganic acid to the second product, adjusting the pH value of the mixed solution to be less than or equal to 3, causing the second product to flocculate, and separating the obtained flocs to obtain an organic polymer modified graphite oxide precursor slurry; The slurry is applied to the surface of the substrate and dried. After drying, the dried material on the surface of the substrate is peeled off to obtain a dried slurry film; the dried slurry film is subjected to heat treatment and reduction treatment to obtain a thermally reduced film; the thermally reduced film is heated to 1000 °C at a first heating rate under an inert atmosphere. After the heat preservation is completed, the temperature is raised to 2600 to 3000°C at the second heating rate. After the heat preservation is completed, a high-temperature carbonized film is obtained; the high-temperature carbonized film is subjected to physical shaping treatment to obtain a heat-conducting film.

Description

technical field [0001] The invention belongs to the technical field of heat-conducting film preparation, and in particular relates to a method for preparing a graphene heat-conducting film. Background technique [0002] As the electronic industry, new energy vehicles, LED and other industries have higher and higher requirements for safe heat dissipation, traditional thermal interface materials are gradually replaced by new thermal conductive 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 15000cm 2 ·V -1 ·s -1 ), mechanical properties (Young's vector 1TPa, intensity 130GPa under ideal conditions), optical properties (light transmittance in the visible light region is over 97%), hig...

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.