Graphene-based thermal interface material and preparation method thereof

Abstract

The invention discloses a graphene-based thermal interface material and a preparation method thereof. The method comprises the following steps: S1, adding a grinding aid and a dispersing agent into organic solvent and stirring to obtain a solution, S2, transferring the solution into a grinding container of a grinder, adding zirconia balls and graphite powder into the grinding container; S3, staring that grinder, peeling and dispersing the graphene through the shear action between the zirconia balls to obtain a dispersion liquid; S4, filtering that dispersion liquid through a net to obtain a graphene dispersion; S5, stirring that graphene dispersion with a high molecular polymer to obtain a first composite; S6, adding a curing agent to that first composite to obtain a second composite; S7,pouring that second composite onto a substrate, solidifying the second composite to obtain a graphene-based thermal interface material. The graphene content used in the invention is low and has greatadvantages in terms of process and cost.

Description

technical field [0001] The invention relates to the field of graphene, in particular to a preparation method of a graphene-based thermal interface material. Background technique [0002] In recent years, with the development of microelectronic devices towards miniaturization, light weight, high density, and high integration, the problem of heat dissipation of heating elements such as chips in electronic equipment has become increasingly prominent. At present, the most commonly used method is to fill the gaps between electronic components with thermal interface materials to reduce the contact thermal resistance between components and improve heat transfer efficiency. At present, the thermal interface material with better thermal conductivity in the industry is formed by growing carbon nanotube arrays on the two surfaces of zirconium metal foil. However, due to the large interface thermal resistance of zirconium metal foil in this thermal interface material, its thermal conduc...

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Problems solved by technology

[0004] Although the relevant technologies in the above related literature have greatly improved the thermal conductivity of graphene-based composite thermal interface materials, their graphene content is often too high (50vol%); on the other hand, most of them use graphene oxide Filling, because graphene oxide needs to consume a large amount of concentrated sulfuric acid and strong oxidant during the preparation process, which is not only dangerous, but also seriously pollutes the environment, and the reduced graphene oxide inevitably still has some oxygen-containing functional groups, resulting in graphite There are many ene defects, and the performance is insufficient in actual use

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