Calcium sulfonate-based compound grease for high-temperature long-life low-noise bearing and preparation method of calcium sulfonate-based compound grease

The invention discloses calcium sulfonate-based complex grease for a high-temperature long-service-life low-noise bearing and a preparation method of the calcium sulfonate-based complex grease, and belongs to the technical field of lubricating grease preparation. The complex grease consists of the following components in parts by weight: 60-75 parts of synthetic base oil; 20 to 35 parts of high base number sulfonate; 3-6 parts of a phase inversion agent; 3-8 parts of polyurea powder; 1-3 parts of a viscosity index improver, 1.5-4 parts of an anti-wear reagent at extreme pressure, 2-5 parts of an antifriction agent, 0.5-2 parts of an antirust agent, 0.5-2 parts of an antioxidant and 0.5-2 parts of a colloid structure stabilizer; the bearing grease with high dropping point, long service life and low noise is prepared through phase inversion, refining, blending and other processes. The calcium sulfonate-based grease is compounded with the polyurea lubricating grease, so that the soap content of the calcium sulfo