Working fluid composition for refrigerator
View Patent ↗The present invention provides a working fluid composition for a refrigerating machine, comprising: a refrigerating machine oil comprising, as a base oil, a mixed ester of (A) a complex ester obtainable by synthesis of at least one polyhydric alcohol selected from neopentyl glycol, trimethylolpropane and pentaerythritol, a C6-C12 polybasic acid, and a C4-C18 monohydric alcohol or a C4-C18 monocarboxylic fatty acid, and (B) a polyol ester obtainable by synthesis of from at least one polyhydric alcohol selected from neopentyl glycol, trimethylolpropane, pentaerythritol and dipentaerythritol, and a C4-C18 monocarboxylic fatty acid, in a mass ratio of (A) the complex ester/(B) the polyol ester of 5/95 to 95/5; and tetrafluoropropene as a refrigerant, wherein a refrigerant dissolved viscosity, at a temperature of 80° C. and an absolute pressure of 1.6 MPa, is 1.5 mm 2 /s or more.
1. A working fluid composition for a refrigerating machine, comprising:
a refrigerating machine oil comprising, as a base oil,
a mixed ester of
(A) a complex ester obtainable by synthesis of at least one polyhydric alcohol consisting of a first alcohol and optionally a second alcohol, wherein the first alcohol is selected from neopentyl glycol and trimethylolpropane, and the second alcohol is selected from C2-C10 dihydric alcohols except neopentyl glycol, a C6-C12 polybasic acid, and a C4-C18 monohydric alcohol or a C4-C18 monocarboxylic fatty acid, and
(B) a polyol ester obtainable by synthesis of from at least one polyhydric alcohol selected from neopentyl glycol, trimethylolpropane, pentaerythritol, and dipentaerythritol, and a C4-C18 monocarboxylic fatty acid,
in a mass ratio of (A) the complex ester/(B) the polyol ester of 5/95 to 95/5; and
tetrafluoropropene as a refrigerant,
wherein a refrigerant dissolved viscosity, at a temperature of 80° C. and an absolute pressure of 1.6 MPa, is 1.5 mm 2 /s or more.
2. The working fluid composition for a refrigerating machine according to claim 1 , wherein the polyhydric alcohol constituting (A) the complex ester is neopentyl glycol and/or trimethylolpropane.
3. The working fluid composition for a refrigerating machine according to claim 1 , wherein the polybasic acid constituting (A) the complex ester is adipic acid and/or sebacic acid.
4. The working fluid composition for a refrigerating machine according to claim 1 , wherein the monohydric alcohol constituting (A) the complex ester is a C8-C10 alcohol.
5. The working fluid composition for a refrigerating machine according to claim 1 , wherein (B) the polyol ester is an ester obtainable by synthesis of neopentyl glycol and/or pentaerythritol and a C4-C9 monocarboxylic fatty acid.
6. The working fluid composition for a refrigerating machine according to claim 1 , wherein (B) the polyol ester is an ester obtainable by synthesis of pentaerythritol and any one of a mixed acid of a C4 monocarboxylic fatty acid and 3,5,5-trimethylhexanoic acid, a mixed acid of a C5 monocarboxylic fatty acid and 3,5,5-trimethylhexanoic acid, and a mixed acid of a C4 monocarboxylic fatty acid, a C5 monocarboxylic fatty acid and 3,5,5-trimethylhexanoic acid.
7. The working fluid composition for a refrigerating machine according to claim 1 , wherein (A) the complex ester is obtainable by synthesis of the polyhydric alcohol, the C6-C12 polybasic acid, and the C4-C18 monohydric alcohol.