REFRIGERATOR OIL AND HYDRAULIC FLUID COMPOSITION FOR REFRIGERATOR

摘要

PROBLEM TO BE SOLVED: To provide a refrigerator oil attaining all of excellent refrigerant compatibility, lubricity and low temperature fluidity when using with difluoromethane refrigerant; and a hydraulic fluid composition for refrigerator.SOLUTION: The refrigerator oil is an ester of dipentaerythritol and fatty acid and contains ≥10 mass% ester in which the ratio of 2-methyl penthanoic acid in the fatty acid is ≥20 mol% on the basis of total quantity of the refrigerator oil, and is used with the difluoromethane refrigerant. The hydraulic fluid composition for refrigerator contains the refrigerator oil and the difluoromethane refrigerant.