| 摘要 |
500,385. Lubricating -compositions. STANDARD OIL DEVELOPMENT CO. Oct. 25, 1937, No. 29105. Convention date, Dec. 24, 1936. [Class 91] An improved lubricant comprises a hydrocarbon oil base and a sulphurized polymer of a semi-drying oil. About 10 to 40 per cent of a sulphurized polymer of rapeseed, mustard seed or a blend of the two oils is preferred. The polymerized oil is sulphurized so that it contains at least 0À5 per cent of sulphur, and preferably 0À5 to 3 per cent. The polymer is prepared by (a) heating the semi-drying oil to 550 to 650‹ F. in a vacuum, (b) by subjecting to an alternating electric glow discharge, (c) by the action of a catalyst such as chlorides of Al, Zn or B, S2Cl2 or SCl2. The polymerization is preferably carried out in the presence of À5 to 1À5 per cent of sulphur. The semi-drying oil is polymerized to a viscosity of from 100 to 1000 seconds Saybolt at 210‹ F. The polymerized oil is sulphurized by heating with sulphur to 400 to 500‹ F. until the desired degree of sulphurization is reached. The sulphurized oil may be digested for a short time at 275 to 300‹ F. The hydrocarbon oil base may be dewaxed distillate fractions from paraffin or mixed crudes, or from solvent-extracted oils. |
