| 摘要 |
PURPOSE:To obtain the title lubricating oil having excellent stability and compatibility in coexistence with tetrafluoroethane refrigerant in a refrigerator using the tetrafluoroethane refrigerant by using a polyester compound prepared by reacting specific two compounds as a base oil. CONSTITUTION:The objective lubricating oil comprising a polyester compound obtained by reacting a compound shown by formula I (R1 to R3 are alkyl) with a compound shown by formula II (R4 to R6 are alkyl, aryl or aralkyl; n is O-4) as a base oil. |
