| abstract |
PROBLEM TO BE SOLVED: To provide a lubricating base oil for a refrigerator that is difficult to crystallize, has low temperature stability, lubricity, stability in the presence of a non-chlorine-based chlorofluorocarbon refrigerant, and excellent compatibility with a non-chlorine-type chlorofluorocarbon refrigerant. To do. SOLUTION: A lubricating oil composition for a refrigerator mainly comprising an ester obtained from a mixed alcohol and a mixed carboxylic acid, the mixed alcohol comprising 65 to 99.95 mol% pentaerythritol and 0.05. -35 mol% dipentaerythritol, and the mixed carboxylic acid consists of 25-55 mol% monocarboxylic acid having 5-8 carbon atoms and 45-75 mol% isononanoic acid, and the hydroxyl value of the composition Is 5.0 mgKOH / g or less, and an acid value is 0.05 mgKOH / g or less. [Selection figure] None |