| abstract |
The refrigerator oil of the present invention contains R1-(OR3)n-OR2 represented by the general formula (1) (1)n[wherein, R1 and R2 may be the same or different from each other, and each represents a hydrogen atom, an alkyl group having 1 to 5 carbon atoms or a fluorenyl group having 2 to 5 carbon atoms, and R3 represents an alkylene group having 2 to 4 carbon atoms, n The number average molecular weight of the polyalkylene glycol represented by the formula (1) is an integer of 1000 to 2500]nFurther, the ratio of the weight average molecular weight Mw to the number average molecular weight Mn, Mw/Mn, is from 1.00 to 1.15, and the refrigerating machine oil of the present invention can be used together with the slightly flammable hydrofluorocarbon refrigerant. |