| 摘要 |
PROBLEM TO BE SOLVED: To decrease wax deposition temperature, when refrigerating machine oil including a lower hydrocarbon refrigerant and hydrocarbon base oil as main components is used.SOLUTION: In a refrigerating machine oil used for the refrigerant including propane and/or isobutane, 100 pts.mass of hydrocarbon base oil, and total 0.001 to 0.05 pt.mass of at least one kind of sulfurized fat, or olefin sulfide are contained, and a sulfur content of the sulfurized fat and the olefin sulfide is 5 to 20 mass%. In the hydrocarbon base oil, it is desirable to be a mineral oil in which a nitrogen content is 50 ppm or less, %Cp is 40 or more, a fluid point is -27.5°C or less, and a sulfur content is 3,000 ppm or less. |
