Working fluid composition for refrigerating machine and refrigerating machine oil

Patent metadata

Field	Value
Publication number	US-9783762-B2
Application number	US-201515113138-A
Country	US
Kind code	B2
Filing date	Jan 16, 2015
Priority date	Jan 21, 2014
Publication date	Oct 10, 2017
Grant date	Oct 10, 2017

Abstract

The present invention provides a working fluid composition for a refrigerating machine containing: a refrigerating machine oil containing, as a base oil, a mixed ester of (A) a complex ester synthesized from a polyhydric alcohol such as neopentyl glycol, a polybasic acid having 6 to 12 carbon atoms, a monohydric alcohol having 4 to 18 carbon atoms and the like, and (B) a polyol ester synthesized from a polyhydric alcohol such as neopentyl glycol and a monocarboxylic fatty acid having 4 to 18 carbon atoms, in a mass ratio of (A) the complex ester/(B) the polyol ester of 5/95 to 95/5; and a refrigerant such as carbon dioxide.

First claim

The invention claimed is:

1. A working fluid composition for a refrigerating machine, comprising:
a refrigerant and a refrigerating machine oil comprising a base oil,
wherein the base oil is a mixture of a complex ester (A) and a polyol ester (B);
wherein (A) is synthesized from at least one first polyhydric alcohol selected from neopentyl glycol and trimethylolpropane, and optionally a second alcohol selected from C2 to C10 dihydric alcohols except neopentyl glycol, a polybasic acid having 6 to 12 carbon atoms, and a monohydric alcohol having 4 to 18 carbon atoms, and
(B) is synthesized from at least one polyhydric alcohol selected from neopentyl glycol, trimethylolpropane, pentaerythritol and dipentaerythritol, and at least one monocarboxylic fatty acid having 4 to 18 carbon atoms,
wherein the mass ratio of (A) to (B) in the base oil is 5/95 to 95/5; and
wherein the refrigerant is selected from carbon dioxide, 1,1,1,2-tetrafluoroethane, a mixture of difluoromethane and pentafluoroethane, a mixture of difluoromethane, pentafluoroethane and 1,1,1,2-tetrafluoroethane, and a mixture of pentafluoroethane, 1,1,1,2-tetrafluoroethane and 1,1,1-trifluoroethane.

2. The working fluid composition for a refrigerating machine according to claim 1 , wherein (A) is synthesized from at least one first polyhydric alcohol selected from neopentyl glycol and trimethylolpropane, a polybasic acid having 6 to 12 carbon atoms, and a monohydric alcohol having 4 to 18 carbon atoms.

3. The working fluid composition for a refrigerating machine according to claim 1 , wherein the polybasic acid constituting (A) is at least one selected from adipic acid and sebacic acid.

4. The working fluid composition for a refrigerating machine according to claim 1 , wherein the monohydric alcohol constituting (A) is a monohydric alcohol having 8 to 10 carbon atoms.

5. The working fluid composition for a refrigerating machine according to claim 1 , wherein (B) is synthesized from at least one selected from neopentyl glycol and pentaerythritol, and at least one selected from monocarboxylic fatty acids having 4 to 9 carbon atoms.

6. The working fluid composition for a refrigerating machine according to claim 1 , wherein (B) is synthesized from pentaerythritol, and a mixed fatty acid of a branched fatty acid having 4 carbon atoms and 3,5,5-trimethylhexanoic acid.

7. The working fluid composition for a refrigerating machine according to claim 1 , wherein (A) is synthesized from at least one first polyhydric alcohol selected from neopentyl glycol and trimethylolpropane, a polybasic acid having 6 to 12 carbon atoms, and a monohydric alcohol having 4 to 18 carbon atoms.

8. A refrigerating machine oil comprising a base oil, wherein the base oil is a mixed ester of complex ester (A) and a polyol ester (B);
wherein (A) is synthesized from at least one first polyhydric alcohol selected from neopentyl glycol and trimethylolpropane, and optionally a second alcohol selected from C2 to C10 dihydric alcohols except neopentyl glycol, a polybasic acid having 6 to 12 carbon atoms, and a monohydric alcohol having 4 to 18 carbon atoms, and
(B) is synthesized from at least one polyhydric alcohol selected from neopentyl glycol, trimethylolpropane, pentaerythritol and dipentaerythritol, and at least one selected from monocarboxylic fatty acids having 4 to 18 carbon atoms,
wherein the mass ratio of (A) to (B) in the base oil is 5/95 to 95/5.

9. The refrigerating machine oil according to claim 8 , wherein (A) is synthesized from at least one first polyhydric alcohol selected from neopentyl glycol and trimethylolpropane, a polybasic acid having 6 to 12 carbon atoms, and a monohydric alcohol having 4 to 18 carbon atoms.

Assignees

• Jx Nippon Oil & Energy Corp
• Jx Nippon Oil & Energy Corp

Inventors

• Takahashi Hitoshi
• Okido Takeshi
• Shimpo Hiroko
• Konno Souichirou

Classifications

• C10M2207/302

  derived from the combination of monocarboxylic acids, dicarboxylic acids and dihydroxy compounds only and having no free hydroxy or carboxyl groups · CPC title

• C10M171/008 Primary

  Lubricant compositions compatible with refrigerants · CPC title

• C10M2207/283

  of polyhydroxy compounds · CPC title

• C10M2207/2835

  used as base material · CPC title

• C10M2207/301

  used as base material · CPC title