REFRIGERATING MACHINE OIL AND WORKING FLUID COMPOSITION FOR REFRIGERATING MACHINES

• US 20130207024A1
• Filed: 08/05/2011
• Published: 08/15/2013
• Est. Priority Date: 08/24/2010
• Status: Active Grant

• Current Assignee: JX Nippon Oil & Energy Corporation (ENEOS Holdings, Inc.)
• Original Assignee: JX Nippon Oil & Energy Corporation (ENEOS Holdings, Inc.)
• Inventors: Takigawa, Katsuya, Saito, Masanori, Okido, Takeshi, Takahashi, Kuniko
• Granted Patent: US 9,005,470 B2
• Time in Patent Office: Days
• US Class Current: 252/68
• CPC Class Codes: C09K 2205/126 Unsaturated fluorinated hydrocarbons
• CPC Class Codes: C09K 2205/22 All components of a mixture being fluoro compounds
• CPC Class Codes: C09K 2205/24 Only one single fluoro component present
• CPC Class Codes: C09K 5/045 containing only fluorine as halogen
• CPC Class Codes: C10M 1/00 Liquid compositions essentially based on mineral lubricating oils or fatty oils; Their use as lubricants
• CPC Class Codes: C10M 171/008 Lubricant compositions compatible with refrigerants
• CPC Class Codes: C10M 2207/026 with tertiary alkyl groups
• CPC Class Codes: C10M 2207/042 Epoxides
• CPC Class Codes: C10M 2207/281 of (cyclo)aliphatic monocarboxylic acids
• CPC Class Codes: C10M 2207/2835 used as base material
• CPC Class Codes: C10M 2223/041 Triaryl phosphates
• CPC Class Codes: C10M 2223/047 Thioderivatives not containing metallic elements
• CPC Class Codes: C10N 2020/02 Viscosity; Viscosity index
• CPC Class Codes: C10N 2020/071 Branched chain compounds
• CPC Class Codes: C10N 2020/101 Containing Hydrofluorocarbons
• CPC Class Codes: C10N 2020/103 Containing Hydrocarbons
• CPC Class Codes: C10N 2020/106 Containing Carbon dioxide
• CPC Class Codes: C10N 2030/02 Pour-point; Viscosity index
• CPC Class Codes: C10N 2030/06 Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
• CPC Class Codes: C10N 2040/30 Refrigerators lubricants or compressors lubricants

Abstract

The refrigerating machine oil of the invention includes an ester of a polyhydric alcohol and a fatty acid, wherein the molar ratio of C₄-C₆ fatty acid and C₇-C₉ branched fatty acid in the fatty acid is between 15:85 and 90:10, the C₄-C₆ fatty acid includes 2-methylpropanoic acid, and the ratio of the total C₄-C₆ fatty acid and C₇-C₉ branched fatty acid in the total fatty acids composing the ester is at least 20 mol %. The working fluid composition for a refrigerating machine according to the invention comprises the refrigerating machine oil, a difluoromethane refrigerant and/or an unsaturated fluorinated hydrocarbon refrigerant.

Claims

1. A refrigerating machine oil comprising an ester of a polyhydric alcohol and a fatty acid, wherein the molar ratio of C₄-C₆ fatty acid and C₇-C₉ branched fatty acid in the fatty acid is between 15:

85 and 90;

10,

the C₄-C₆ fatty acid includes 2-methylpropanoic acid, and

the ratio of the total C₄-C₆ fatty acid and C₇-C₉ branched fatty acid in the total fatty acids composing the ester is at least 20 mol %.

2. The refrigerating machine oil according to claim 1, wherein the ratio of 2-methylpropanoic acid in the C₄-C₆ fatty acid is at least 20 mol %.

3. The refrigerating machine oil according to claim 1, wherein the C₄-C₆ fatty acid is 2-methylpropanoic acid.

4. The refrigerating machine oil according to claim 1, wherein the polyhydric alcohol is pentaerythritol and the 40°

C. kinematic viscosity of the refrigerating machine oil is 20 to 80 mm²/s.

5. The refrigerating machine oil according to claim 1, wherein the C₇-C₉ branched fatty acid is 3,5,5-trimethylhexanoic acid.

6. A working fluid composition for a refrigerating machine, comprising the refrigerating machine oil according to claim 1 and a difluoromethane refrigerant.

7. A working fluid composition for a refrigerating machine comprising the refrigerating machine oil according to claim 1 and an unsaturated fluorinated hydrocarbon refrigerant.

8. A working fluid composition for a refrigerating machine comprising the refrigerating machine oil according to claim 1, a difluoromethane refrigerant and an unsaturated fluorinated hydrocarbon refrigerant.

9. A working fluid composition for a refrigerating machine comprising the refrigerating machine oil according to claim 1, a difluoromethane refrigerant and an unsaturated fluorinated hydrocarbon refrigerant, wherein the mass ratio of the difluoromethane refrigerant and the unsaturated fluorinated hydrocarbon refrigerant is between 95:

5 and 50;

50.