| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a refrigeration oil in which excellent compatibility and dissolubility to a cooling medium R32 are possessed, a viscosity in which lubricity is not damaged can be retained, and stability, lubricity, and electrical insulation properties or the like are excellent.SOLUTION: A refrigeration oil for a cooling medium R32 is such that an ester in which an ester intermediate in which trimethylol propane and/or neopentyl glycol is reacted with a 2-12C dibasic acid and esterification is performed by a 1-12C monohydric alcohol or a 2-12C monovalent fatty acid, and an acid number is at most 0.1 mgKOH/g is made a base oil, and a kinematic viscosity at 100°C is 2-30 mm/s.</p> |
