| 摘要 |
PROBLEM TO BE SOLVED: To enhance thermal stability by lengthening a solidification time under high temperature environment to make solidification (oxidation polymerization) and sludge hard and expanding heat resistance range to higher area.SOLUTION: There is provided a lubricant composition containing polyol ester as a base oil, an aromatic amine-based antioxidant containing 2 kinds of alkylated diphenylamine and alkylated phenyl naphthylamine, a phosphite-based antioxidant, a boron-containing extreme pressure agent and dimethyl polysiloxane and having the content of polyol ester of 75 to 95 mass%, the content of the aromatic amine-based antioxidant of 0.5 to 10 mass% for both of the alkylated diphenylamine and the alkylated phenyl naphthylamine, the content of the phosphite-based antioxidant of 0.5 to 5 mass%, the content of the boron-containing extreme pressure agent of 0.1 to 5 mass% and the content of the dimethyl polysiloxane of 1 to 100 ppm. |
