| abstract |
PROBLEM TO BE SOLVED: To provide a polyalkylene glycol having excellent heat resistance and oxidation stability even with a high molecular weight, and having a high viscosity index even if the molecular weight is low. Provide a system lubricant. SOLUTION: A polyalkylene glycol-based lubricant comprising a compound represented by a specific general formula, a refrigerating machine oil using the lubricant, and a refrigerating machine oil for carbon dioxide refrigerant. |