Refrigerator oil and refrigerator working fluid composition
The present invention, in one aspect, provides a refrigerating machine oil including a lubricating base oil and a compound represented by the following formula (A): wherein R 1 and R 2 each independently represent a monovalent hydrocarbon group, and R 3 and R 4 each independently represent a hydrogen atom or an alkyl group, the refrigerating machine oil being used with a refrigerant including an unsaturated hydrofluorocarbon.
1. A refrigerating machine oil comprising:
a lubricating base oil comprising polyol esters; and
a compound represented by the following formula (A):
wherein R1 and R2 each independently represent a chain alkyl group having 3 to 9 carbon atoms, R3 represents a hydrogen atom, and R4 represents a linear or branched alkyl group having 1 to 4 carbon atoms, and
wherein a content of the compound represented by the formula (A) is 0.03% by mass or more based on the total amount of the refrigerating machine oil,
the refrigerating machine oil being used with a refrigerant comprising an unsaturated hydrofluorocarbon.
2. The refrigerating machine oil according to claim 1 , comprising, as the lubricating base oil, an ester of a polyhydric alcohol and a fatty acid comprising 50 to 100% by mole of a branched fatty acid having 4 to 9 carbon atoms.
3. The refrigerating machine oil according to claim 1 , wherein the refrigerant comprises 1,1,2-trifluoroethylene as the unsaturated hydrofluorocarbon.
4. The refrigerating machine oil according to claim 1 , wherein the refrigerant further comprises a saturated hydrofluorocarbon.
5. The refrigerating machine oil according to claim 1 , wherein
R1 and R2 each independently represent a branched alkyl group having 4 to 6 carbon atoms, and
R4 represents a linear alkyl group having 1 to 2 carbon atoms.
6. The refrigerating machine oil according to claim 1 , wherein the compound represented by the formula (A) is compound represented by the following formula (A-1).
7. The refrigerating machine oil according to claim 1 , wherein the compound represented by the formula (A) is compound represented by the following formula (A-1):
8. The refrigerating machine oil according to claim 1 , wherein a content of the compound represented by the formula (A) is 0.08% by mass or less based on the total amount of the refrigerating machine oil.
9. The refrigerating machine oil according to claim 1 , wherein the compound represented by the formula (A) is compound represented by the following formula (A-1):
and wherein a content of the compound represented by the formula (A) is 0.03% by mass or more and 0.08% by mass or less, based on the total amount of the refrigerating machine oil.
10. A working fluid composition for a refrigerating machine, comprising:
a refrigerant comprising an unsaturated hydrofluorocarbon; and
a refrigerating machine oil comprising:
a lubricating base oil comprising polyol esters; and
a compound represented by the following formula (A):
wherein R1 and R2 each independently represent a chain alkyl group having 3 to 9 carbon atoms, R3 represents a hydrogen atom, and R4 represents a linear or branched alkyl group having 1 to 4 carbon atoms,
wherein a content of the compound represented by the formula (A) is 0.03% by mass or more based on the total amount of the refrigerating machine oil.
11. The working fluid composition for a refrigerating machine according to claim 10 , wherein the refrigerant comprises 1,1,2-trifluoroethylene as the unsaturated hydrofluorocarbon.
12. The working fluid composition for a refrigerating machine according to claim 10 , wherein the refrigerant further comprises a saturated hydrofluorocarbon.
13. The working fluid composition for a refrigerating machine according to claim 10 , wherein the refrigerating machine oil comprises, as the lubricating base oil, an ester of a polyhydric alcohol and a fatty acid comprising 50 to 100% by mole of a branched fatty acid having 4 to 9 carbon atoms.
14. The working fluid composition for a refrigerating machine according to claim 10 , wherein R1 and R2 each independently represent a branched alkyl group having 4 to 6 carbon atoms, R3 represents a hydrogen atom, and R4 represents a linear alkyl group having 1 to 2 carbon atoms.
15. The working fluid composition for a refrigerating machine according to claim 10 , wherein the compound represented by the formula (A) is compound represented by the following formula (A-1).
16. The working fluid composition for a refrigerating machine according to claim 10 , wherein the compound represented by the formula (A) is compound represented by the following formula (A-1):
17. The working fluid composition for a refrigerating machine according to claim 10 , wherein a content of the compound represented by the formula (A) is 0.08% by mass or less based on the total amount of the refrigerating machine oil.
18. The working fluid composition for a refrigerating machine according to claim 10 , wherein the compound represented by the formula (A) is compound represented by the following formula (A-1):
and wherein a content of the compound represented by the formula (A) is 0.03% by mass or more and 0.08% by mass or less, based on the total amount of the refrigerating machine oil.