A lubricant composition (for a refrigerating machine employing a HFC type refrigerant containing at least one selected from the group consisting of HFC-32, HFC-125, and HFC-134a) comprises a base oil of an ester formed from a dihydric or higher polyol as an alcohol and a monobasic aliphatic acid, alone or as a mixture thereof; and additives of, based on the total amount, (1) not less than 0.01 vol% and less than 1.0 vol% of a phosphate, (2) from 0.01 to 1.0 vol% of at least one of an alkylphosphorothionate and an arylphosphorothionate, and (3) from 0.01 to 1.0 vol% of an epoxy compound.
一种润滑剂组合物(用于使用 HFC 类型制冷剂的制冷机,该制冷剂至少包含一种选自
HFC-32、HFC-125 和 H
FC-134a 组成的组的制冷剂)包括一种基础油,该基础油由作为醇的二
水或二
水以上多元醇和单碱性脂肪族酸单独或混合形成的酯组成;以及添加剂,以总量为基准,(1) 不小于 0.01 Vol%且小于 1.0 Vol%的
磷酸盐,(2) 0.01 至 1.0 Vol%的烷基
硫代磷酸酯和芳基
磷酸盐中的至少一种。(2) 0.01 至 1.0 Vol%的烷基
硫代磷酸酯和芳基
硫代磷酸酯中的至少一种,以及 (3) 0.01 至 1.0 Vol%的环氧化合物。