| 摘要 |
PROBLEM TO BE SOLVED: To obtain a urea grease composition being excellent in friction characteristics and nonabrasiveness and not causing deterioration of a seal material by mixing a urea grease with two specified compounds as additives. SOLUTION: A urea grease is mixed with a sulfided molybdenum dialkyldithiocarbamate (A) represented by formula I (wherein R<1> and R<2> are each a 1-24C alkyl; m+n=4; m is 0-3; and n is 4-1) and a triphenyl phosphate (B) represented by formula II. Component A is in the form of a powder and is used in an amount of 0.5-10wt.% based on the entire weight. Component B is in the form of a normally solid powder having a melting point of 50 deg.C and is used in an amount of 0.1-10wt.% based on the entire weight of the base grease. The urea compound used as a thickening agent may be of any type and is exemplified by urea or tirurea. The base oil used comprises a mineral oil and/or a synthetic oil, and the urea compound as a thickening agent is used in an amount of 2-35wt.% based on the total weight of the base oil and the urea compound. The obtained mixture is further mixed with various additives such as an antioxidant, a rust preventive, an extreme pressure agent and a polymer to obtain a urea grease composition. |
