Working fluid composition for refrigerator

• US 9,725,630 B2
• Filed: 03/14/2014
• Issued: 08/08/2017
• Est. Priority Date: 03/25/2013
• Status: Active Grant

• Current Assignee: ENEOS Corporation (ENEOS Holdings, Inc.)
• Original Assignee: JX Nippon Oil & Energy Corporation (ENEOS Holdings, Inc.)
• Inventors: Okido, Takeshi, Konno, Souichirou
• Primary Examiner(s): Hardee, John
• Application Number:
  US14/777,583
• Publication Number:
  US 20160289523A1
• Time in Patent Office: 1,243 Days
• CPC Class Codes: C09K 5/041 for compression-type refrigeration systems
• CPC Class Codes: C09K 5/042 comprising compounds containing carbon and hydrogen only
• CPC Class Codes: C10M 105/32 Esters
• CPC Class Codes: C10M 2207/2835 used as base material
• CPC Class Codes: C10M 2207/301 used as base material
• CPC Class Codes: C10M 2207/3025 used as base material
• CPC Class Codes: C10M 2207/3045 used as base material
• CPC Class Codes: C10N 2020/02 Viscosity; Viscosity index
• CPC Class Codes: C10N 2020/071 Branched chain compounds
• 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 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 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 a hydrocarbon refrigerant having 3 or 4 carbon atoms, wherein a refrigerant dissolved viscosity, at a temperature of 80° C. and an absolute pressure of 1.5 MPa, is 1.0 mm²/s or more.

Claims

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 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

a hydrocarbon refrigerant having 3 or 4 carbon atoms,

wherein a refrigerant dissolved viscosity, at a temperature of 80°

C. and an absolute pressure of 1.5 MPa, is 1.0 mm²/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 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.