High-temperature-resistant polytetrafluoroethylene lubricating grease for sealing and preparation method thereof

The invention provides high-temperature-resistant polytetrafluoroethylene lubricating grease for sealing. The lubricating grease is prepared from, by mass, 30-70% of base oil, 25-55% of thickener, 2-5% of structural stabilizer, 1-5% of tackifier and 1-5% of lubricant. The invention further provides a preparation method of the lubricating grease, polytetrafluoroethylene micro powder serves as the thickener to thicken silicone oil as the base oil, meanwhile a certain amount of the structural stabilizer, the tackifier and the lubricant are added at the same time, and then the lubricating grease is prepared through corresponding preparation processes. The prepared polytetrafluoroethylene lubricating grease has excellent high temperature resistance, good sealing performance, excellent lubricity, adhesion and oxidation resistance, high load, water spraying resistance and other properties, the lubricating grease has no suncrack, oil splitting and hardening phenomena at the high temperature more than 200 DEG C, and h