| 摘要 |
PROBLEM TO BE SOLVED: To obtain a refrigerator oil capable of manifesting excellent lubricity, compatibility with ammonia refrigerant, low-temperature fluidity, stability, or the like, by including a specific polypropylene glycol monoether as a principal component. SOLUTION: This refrigerator oil contains a polypropylene glycol monoether represented by the formula [R is a 1-10C alkyl; (n) is an integer capable of providing the number-average molecular weight with 500-5,000]. The polypropylene glycol monoether preferably has <=-10 deg.C pour point, >=2 mm2/s kinematic viscosity at 100 deg.C and 1.00-1.20 ratio of the weight-average molecular weight to the number-average molecular weight. The content of the polypropylene glycol monoether in the refrigerator oil is preferably >=50 mass% based on the total amount of the refrigerator oil. Thereby, higher-level performances than required performances such as compatibility with ammonia refrigerant, lubricity and stability can be achieved.
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