Working fluid composition for refrigerator, and refrigerator oil
The present invention provides a working fluid composition for a refrigerating machine, comprising a refrigerating machine oil that comprises an ester of a polyhydric alcohol and a fatty acid, an epoxy compound, and a phosphorus compound, and a fluoropropene refrigerant, wherein the polyhydric alcohol constituting the ester comprises pentaerythritol and dipentaerythritol, the fatty acid constituting the ester comprises at least one selected from fatty acids having 4 to 9 carbon atoms, and the epoxy compound and the phosphorus compound satisfy a condition represented by the following formula (1). [ Formula 1 ] 0.10 ≤ ( N E M E · W E ) ( N P M P · W P ) ≤ 1.50 ( 1 )
1. A working fluid composition for a refrigerating machine, comprising:
a refrigerating machine oil comprising an ester of a polyhydric alcohol and a fatty acid, an epoxy compound, and a phosphorus compound; and
a fluoropropene refrigerant,
wherein the polyhydric alcohol constituting the ester comprises pentaerythritol and dipentaerythritol,
the fatty acid constituting the ester comprises at least one selected from fatty acids having 4 to 9 carbon atoms, and
the epoxy compound and the phosphorus compound satisfy a condition represented by the following formula (1):
[
Formula
1
]
0.10
≤
(
N
E
M
E
·
W
E
)
(
N
P
M
P
·
W
P
)
≤
1.50
(
1
)
wherein N E represents a number of epoxy groups per one molecule of the epoxy compound, M E represents a molecular weight of the epoxy compound, W E represents a content of the epoxy compound based on a total amount of the refrigerating machine oil, N P represents a number of phosphorus atoms per one molecule of the phosphorus compound, M P represents a molecular weight of the phosphorus compound, and W P represents a content of the phosphorus compound based on the total amount of the refrigerating machine oil.
2. The working fluid composition for a refrigerating machine according to claim 1 , wherein the ester comprises a mixture of a first ester being an ester of pentaerythritol and at least one fatty acid selected from fatty acids having 4 to 9 carbon atoms and a second ester being an ester of dipentaerythritol and at least one fatty acid selected from fatty acids having 4 to 9 carbon atoms.
3. The working fluid composition for a refrigerating machine according to claim 2 , wherein a content of the second ester is 10% by mass or more and 40% by mass or less based on a, total of a content of the first ester and the content of the second ester.
4. The working fluid composition for a refrigerating machine according to claim 1 , further comprising 0.1% by mass or more and 0.4% by mass or less of 2,6-di-tert.-butyl-p-cresol based on the total amount of the refrigerating machine oil.
5. The working fluid composition for a refrigerating machine according to claim 1 , wherein the fluoropropene refrigerant is at least one selected from 1,3,3,3-tetrafluoropropene (HFO-1234ze) and 2,3,3,3-tetrafluoropropene (HFO-1234yf).
6. A refrigerating machine oil comprising:
an ester of a polyhydric alcohol and a fatty acid;
an epoxy compound; and
a phosphorus compound,
the refrigerating machine oil being used with a fluoropropene refrigerant,
wherein the polyhydric alcohol constituting the ester comprises pentaerythritol and dipentaerythritol,
the fatty acid constituting the ester comprises at least one selected from fatty acids having 4 to 9 carbon atoms, and
the epoxy compound and the phosphorus compound satisfy a condition represented by the following formula (1):
[
Formula
2
]
0.10
≤
(
N
E
M
E
·
W
E
)
(
N
P
M
P
·
W
P
)
≤
1.50
(
1
)
wherein N E represents a number of epoxy groups per one molecule of the epoxy compound, M E represents a molecular weight of the epoxy compound, W E represents a content of the epoxy compound based on a total amount of the refrigerating machine oil, N P represents a number of phosphorus atoms per one molecule of the phosphorus compound, M P represents a molecular weight of the phosphorus compound, and W P represents a content of the phosphorus compound based on the total amount of the refrigerating machine oil.
7. The working fluid composition for a refrigerating machine according to claim 3 , wherein the fatty acid comprises a mixed acid of 2-methylpropanoic acid and 3,5,5-trimethylhexanoic acid or a mixed acid of 2-ethylhexanoic acid and 3,5,5-trimethylhexanoic acid.
8. The working fluid composition for a refrigerating machine according to claim 1 , wherein
a content of the ester is 80% by mass or more and 99% by mass or less based on a total amount of the refrigerating machine oil,
the epoxy compound is at least one selected from the group consisting of
a compound represented by the following formula (2)
wherein R 1 represents an aryl group or an alkyl group having 5 to 18 carbon atoms,
a compound represented by the following formula (3)
wherein R 2 represents an aryl group, or an alkyl group or an alkenyl group having 5 to 18 carbon atoms, and
a compound represented by the following formula (4),
a content of the epoxy compound is 0.1% by mass or more and 1.0% by mass or less based on a total amount of the refrigerating machine oil,
the phosphorus compound is at least one selected from the group consisting of
a phosphoric acid ester selected from the group consisting of tributyl phosphate, tripentyl phosphate, trihexyl phosphate, triheptyl phosphate, trioctyl phosphate, trinonyl phosphate, tridecyl phosphate, triundecyl phosphate, tridodecyl phosphate, tritridecyl phosphate, tritetradecyl phosphate, tripentadecyl phosphate, trihexadecyl phosphate, triheptadecyl phosphate, trioctadecyl phosphate, trioleyl phosphate, triphenyl phosphate, tricresyl phosphate, trixylenyl phosphate, cresyl diphenyl phosphate, and xylenyl diphenyl phosphate, and
a thiophosphoric acid ester selected from the group consisting of tributyl phosphorothionate, tripentyl phosphorothionate, trihexyl phosphorothionate, triheptyl phosphorothionate, trioctyl phosphorothionate, trinonyl phosphorothionate, tridecyl phosphorothionate, triundecyl phosphorothionate, tridodecyl phosphorothionate, tritridecyl phosphorothionate, tritetradecyl phosphorothionate, tripentadecyl phosphorothionate, trihexadecyl phosphorothionate, triheptadecyl phosphorothionate, trioctadecyl phosphorothionate, trioleyl phosphorothionate, triphenyl phosphorothionate, tricresyl phosphorothionate, trixylenyl phosphorothionate, cresyl diphenyl phosphorothionate, and xylenyl diphenyl phosphorothionate, and
a content of the phosphorus compound is 0.1% by mass or more and 2.4% by mass or less based on a total amount of the refrigerating machine oil.
9. The working fluid composition for a refrigerating machine according to claim 3 , wherein
a content of the ester is 80% by mass or more and 99% by mass or less based on a total amount of the refrigerating machine oil,
the epoxy compound is at least one selected from the group consisting of
a compound represented by the following formula (2)
wherein R 1 represents an aryl group or an alkyl group having 5 to 18 carbon atoms,
a compound represented by the following formula (3)
wherein R 2 represents an aryl group, or an alkyl group or an alkenyl group having 5 to 18 carbon atoms, and
a compound represented by the following formula (4),
a content of the epoxy compound is 0.1% by mass or more and 1.0% by mass or less based on a total amount of the refrigerating machine oil,
the phosphorus compound is at least one selected from the group consisting of
a phosphoric acid ester selected from the group consisting of tributyl phosphate, tripentyl phosphate, trihexyl phosphate, triheptyl phosphate, trioctyl phosphate, trinonyl phosphate, tridecyl phosphate, triundecyl phosphate, tridodecyl phosphate, tritridecyl phosphate, tritetradecyl phosphate, tripentadecyl phosphate, trihexadecyl phosphate, triheptadecyl phosphate, trioctadecyl phosphate, trioleyl phosphate, triphenyl phosphate, tricresyl phosphate, trixylenyl phosphate, cresyl diphenyl phosphate, and xylenyl diphenyl phosphate, and
a thiophosphoric acid ester selected from the group consisting of tributyl phosphorothionate, tripentyl phosphorothionate, trihexyl phosphorothionate, triheptyl phosphorothionate, trioctyl phosphorothionate, trinonyl phosphorothionate, tridecyl phosphorothionate, triundecyl phosphorothionate, tridodecyl phosphorothionate, tritridecyl phosphorothionate, tritetradecyl phosphorothionate, tripentadecyl phosphorothionate, trihexadecyl phosphorothionate, triheptadecyl phosphorothionate, trioctadecyl phosphorothionate, trioleyl phosphorothionate, triphenyl phosphorothionate, tricresyl phosphorothionate, trixylenyl phosphorothionate, cresyl diphenyl phosphorothionate, and xylenyl diphenyl phosphorothionate, and
a content of the phosphorus compound is 0.1% by mass or more and 2.4% by mass or less based on a total amount of the refrigerating machine oil.
10. The working fluid composition for a refrigerating machine according to claim 4 , wherein
a content of the ester is 80% by mass or more and 99% by mass or less based on a total amount of the refrigerating machine oil,
the epoxy compound is at least one selected from the group consisting of
a compound represented by the following formula (2)
wherein R 1 represents an aryl group or an alkyl group having 5 to 18 carbon atoms,
a compound represented by the following formula (3)
wherein R 2 represents an aryl group, or an alkyl group or an alkenyl group having 5 to 18 carbon atoms, and
a compound represented by the following formula (4),
a content of the epoxy compound is 0.1% by mass or more and 1.0% by mass or less based on a total amount of the refrigerating machine oil,
the phosphorus compound is at least one selected from the group consisting of
a phosphoric acid ester selected from the group consisting of tributyl phosphate, tripentyl phosphate, trihexyl phosphate, triheptyl phosphate, trioctyl phosphate, trinonyl phosphate, tridecyl phosphate, triundecyl phosphate, tridodecyl phosphate, tritridecyl phosphate, tritetradecyl phosphate, tripentadecyl phosphate, trihexadecyl phosphate, triheptadecyl phosphate, trioctadecyl phosphate, trioleyl phosphate, triphenyl phosphate, tricresyl phosphate, trixylenyl phosphate, cresyl diphenyl phosphate, and xylenyl diphenyl phosphate, and
a thiophosphoric acid ester selected from the group consisting of tributyl phosphorothionate, tripentyl phosphorothionate, trihexyl phosphorothionate, triheptyl phosphorothionate, trioctyl phosphorothionate, trinonyl phosphorothionate, tridecyl phosphorothionate, triundecyl phosphorothionate, tridodecyl phosphorothionate, tritridecyl phosphorothionate, tritetradecyl phosphorothionate, tripentadecyl phosphorothionate, trihexadecyl phosphorothionate, triheptadecyl phosphorothionate, trioctadecyl phosphorothionate, trioleyl phosphorothionate, triphenyl phosphorothionate, tricresyl phosphorothionate, trixylenyl phosphorothionate, cresyl diphenyl phosphorothionate, and xylenyl diphenyl phosphorothionate, and
a content of the phosphorus compound is 0.1% by mass or more and 2.4% by mass or less based on a total amount of the refrigerating machine oil.
11. The working fluid composition for a refrigerating machine according to claim 4 , wherein the lower limit is 0.12 or more and the upper limit is 1.48 or less in the formula (1).
12. The working fluid composition for a refrigerating machine according to claim 10 , wherein the lower limit is 0.12 or more and the upper limit is 1.48 or less in the formula (1).