| abstract |
The present invention provides a refrigerating machine oil containing the following general formula (1): n n n [In the formula, R 1 , R 2 and R 3 may be the same or different from each other, and each represents a hydrogen atom or a hydrocarbon group, R 4 represents a divalent hydrocarbon group or a divalent ether bond oxygen-containing hydrocarbon group, R 5 represents a hydrocarbon group, m Represents an integer of 0 or more; when m is 2 or more, a plurality of R 4 may be the same or different from each other]n n n The represented structural unit, and the number average molecular weight Mn is 500 or more and 2000 or less, the ratio of the weight average molecular weight Mw to the number average molecular weight Mn Mw / Mn is 1.10 or more and 1.25 or less polyvinyl ether, and is slightly flammable Hydrocarbon refrigerants are used together. |