| abstract |
To provide a biodegradable lubricating oil composition that is excellent in lubricity, oxidation stability, and biodegradability, and that is also suitable for a speed increaser used in a wind power generator. A biodegradable lubricating oil composition is obtained by reacting (A) a saturated aliphatic carboxylic acid, a linear aliphatic divalent carboxylic acid and a polyhydric alcohol, and has a kinematic viscosity at 40 ° C. of 400 mm 2. / S or more, 1000 mm 2 / s or less, an acid value of 0.5 mgKOH / g or less, and (B) a linear saturated aliphatic carboxylic acid and a polyhydric alcohol are reacted to obtain an acid value of 0 An ester that is 0.5 mgKOH / g or less and (C) a phosphoric ester amine salt obtained by reacting an acidic phosphoric ester with an alkylamine are blended. [Selection figure] None |