GREASE COMPOSITION FOR BEARING USED UNDER HIGH-TEMPERATURE, HIGH-SPEED AND HIGH-LOAD CONDITIONS

摘要

PURPOSE:To obtain the title composition prevented from undergoing initial leakage under high-temperature and high-speed conditions and early seizure under high-load conditions by mixing an alkyldiphenyl ether oil with a specified lubricating base oil and a thickener to obtain a mixture of a specified consistency. CONSTITUTION:A lubricating base oil (e.g. mineral oil) having a kinematic viscosity of 90-160cSt at 40 deg.C and consisting essentially of at least 50wt.%, based on the base oil, alkyldiphenyl ether oil (obtained by the addition reaction of diphenyl ether with a 10-22C alpha-olefin) is mixed with 22-30wt.% diurea compound of the formula (wherein R2 is a 6-15C aromatic hydrocarbon groups; R1 and R3 are each a 6-12C aromatic hydrocarbon group or an 8-20C linear alkyl group, and the content of R1 and R2 which are aromatic hydrocarbon groups is 70-95mol%) (e.g. one obtained from TDI, p-toluidine and octylamine), and 0.1-10wt.% each of an organic sulfonate as a rust preventive, a nitrate and a nonionic surfactant of an HLB of 1.5-9 to obtain a mixture of an NLGI consistency in the range of No.1 to No.3.