Preparation method of low-expansion thermal reduction graphene oxide

The invention discloses a preparation method of low-expansion thermal reduction graphene oxide. The preparation method comprises the following steps: carrying out oxidation treatment on graphite to obtain graphite oxide; uniformly mixing graphite oxide with inorganic salt and ethanol in a mass ratio of 1: (1-8): (0.5-5), wherein the inorganic salt is at least one of sodium chloride, potassium chloride, calcium chloride, magnesium chloride, sodium sulfate or potassium bromide; heating for 1-10 hours at the temperature of 400-1100 DEG C, and washing and drying the heated product with water; carrying out ball-milling crushing treatment for 0.5-8 hours at the rotating speed of 100-500 revolutions per minute to obtain low-expansion thermal reduction graphene oxide; the prepared low-expansion thermal reduction graphene oxide is used in lubricating grease, the friction coefficient of the lubricating grease can be effectively reduced, and the performance is improved. 本发明公开了一种低膨胀热还原氧化石墨烯的制备方法。其制备方法包括如下步骤：将石墨经氧化处理得到氧化石