| 摘要 |
PROBLEM TO BE SOLVED: To provide an ashless lubricant composition having excellent extreme pressure performance and rust prevention under severe condition and containing no metal.SOLUTION: The lubricant composition is provided by adding to a lubricant base oil, a rust preventive selected from an alkyl or alkenyl succinic acid and partial esters thereof, a 8C-24C sarcosine and derivative thereof, alkylated phenoxyacetic acid, N-acyl-N-alkoxyalkyl aspartate esters, at least one amine selected from the group consisting of alkylamines represented by general formula (1) and N-alkyl polyalkylenediamines represented by general formula (2), and, as an extreme pressure agent, triaryl phosphorotioate represented by general formula (4) and/or an acidic phosphate ester represented by general formula (5). |
