| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a biodegradable lubricant composition excellent in lubricity, oxidation stability and biodegradability, and suitable as a speed increasing gear used in a wind power generator.SOLUTION: A biodegradable lubricant composition is obtained by mixing (A) ester represented by the formula (1) and having a kinetic viscosity at 40°C of 300 to 1000 mm/s and the acid number of 0.5 mgKOH/g or less, (B) ester obtained by reacting liner saturated aliphatic carboxylic acid and polyalcohol and having the acid number of 0.5 mgKOH/g or less and (C) a phosphoric acid ester amine salt obtained by reacting acid phosphate and alkyl amine. In the formula (1), Ra is a hydrocarbyl group having 4 to 20 carbon atoms, Rb is a hydrocarbyl group having 4 to 18 carbon atoms, Rc is a hydrogen atom or an acyl group having 1 to 10 carbon atoms, and n is 3 to 15.</p> |
