We selected glacial acetic acid and concentrated sulfuric acid as intercalation materials, and discussed the production technology of micron expandable graphite from the aspects of reactant ratio, reaction temperature, reaction time and drying temperature. The particle size, surface topography and infrared extinction ability of the product were also characterized.

The experimental results show that micron expandable graphite can be produced by selecting suitable reactants, controlling the proportion of reactants, reaction temperature and time, drying temperature and other technological conditions. The infrared extinction ability of the graphite in the middle and far infrared region is better than that of the fine powder graphite.

The thermal conductivity of ultra-thin graphite film (tens of microns thickness) was measured by laser flash method. The thermal conductivity of graphite film in plane direction is much higher than that in thickness direction. Through the special In-Plane attachment and the corresponding mathematical model, we can obtain the thermal conductivity in the plane direction of graphite film.

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