Refrigerator oil composition, method for producing same, and working fluid composition for refrigerators

Patent metadata

Field	Value
Publication number	US-9234155-B2
Application number	US-201314379363-A
Country	US
Kind code	B2
Filing date	Feb 19, 2013
Priority date	Feb 22, 2012
Publication date	Jan 12, 2016
Grant date	Jan 12, 2016

Abstract

A refrigerating machine oil composition comprising at least one ester additive selected from tetraesters of pentaerythritol and one selected from fatty acids having 5 to 18 carbon atoms and hexaesters of dipentaerythritol and one selected from fatty acids having 5 to 18 carbon atoms, and a base oil that is an ester other than the ester additive, in which the content of the ester additive is 2 to 20 mass % based on the total amount of the refrigerating machine oil composition, and the kinematic viscosity of the refrigerating machine oil composition at 40° C. is 3 to 500 mm 2 /s.

First claim

The invention claimed is:

1. A refrigerating machine oil composition comprising:
2 to 20 mass % based on a total amount of the refrigerating machine oil composition of at least one ester additive selected from tetraesters of pentaerythritol and one selected from fatty acids having 5 to 18 carbon atoms and hexaesters of dipentaerythritol and one selected from fatty acids having 5 to 18 carbon atoms;
a base oil that is an ester other than the ester additive; and
0.1 to 5 mass % of a phosphate and/or 0.01 to 2 mass % of a sulfide compound based on the total amount of the refrigerating machine oil composition,
wherein a kinematic viscosity of the refrigerating machine oil composition at 40° C. is 3 to 500 mm 2 /s.

2. The refrigerating machine oil composition according to claim 1 , wherein the ester additive is at least one selected from pentaerythritoltetra(2-ethylhexanoate) and dipentaerythritolhexa(hexanoate).

3. The refrigerating machine oil composition according to claim 1 , wherein the kinematic viscosity at 40° C. is 3 to 300 mm 2 /s.

4. The refrigerating machine oil composition according to claim 1 , wherein the base oil is a polyol ester.

5. The refrigerating machine oil composition according to claim 1 , wherein the base oil is a polyol ester obtained from pentaerythritol and a mixed acid of a carboxylic acid having 4 to 7 carbon atoms and 3,5,5-trimethylhexanoic acid.

6. The refrigerating machine oil composition according to claim 1 , wherein the base oil is a polyol ester obtained from pentaerythritol, a branched butanoic acid, and 3,5,5-trimethylhexanoic acid, wherein a kinematic viscosity of the polyol ester at 40° C. is 30 to 110 mm 2 /s.

7. The refrigerating machine oil composition according to claim 1 , wherein the content of the ester additive is 2 to 7 mass % based on the total amount of the refrigerating machine oil composition.

8. A working fluid composition for refrigerating machines comprising:
the refrigerating machine oil composition according to claim 1 ; and
a refrigerant containing at least one selected from hydrofluorocarbons, hydrofluoroolefins, and hydrocarbons, wherein a global warming potential of the refrigerant is 700 or less.

9. The refrigerating machine oil composition according to claim 1 , wherein the phosphate is at least one selected from triphenyl phosphate, tricresyl phosphate, and alkylphenyl phosphates having an alkyl group having 3 or 4 carbon atoms.

10. The refrigerating machine oil composition according to claim 1 , wherein the sulfide compound is a thiobisphenol compound.

11. A method for producing a refrigerating machine oil composition comprising:
blending 2 to 20 mass % based on a total amount of the refrigerating machine oil composition of at least one ester additive selected from tetraesters of pentaerythritol and one selected from fatty acids having 5 to 18 carbon atoms and hexaesters of dipentaerythritol and one selected from fatty acids having 5 to 18 carbon atoms into a base oil that is an ester other than the ester additive to obtain the refrigerating machine oil composition,
wherein
the refrigerating machine oil composition comprises 0.1 to 5 mass % based on the total amount of the refrigerating machine oil composition of a phosphate compound and/or 0.01 to 2 mass % based on the total amount of the refrigerating machine oil composition of a sulfide compound and
a kinematic viscosity of the refrigerating machine oil composition at 40° C. is 3 to 500 mm 2 /s.

12. The working fluid composition for refrigerating machines according to claim 8 , wherein the refrigerant contains difluoromethane (R32).

Assignees

• Jx Nippon Oil & Energy Corp

Inventors

• Saito Masanori
• Okido Takeshi
• Eto Hiroshi
• ADEGAWA Kuniko

Classifications

• C10N2030/06

  Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure · CPC title

• C10N2020/101

  Containing Hydrofluorocarbons · CPC title

• C10N2020/103

  Containing Hydrocarbons · CPC title

• C10N2040/30

  Refrigerators lubricants {or compressors lubricants} · CPC title

• C10N2020/071

  Branched chain compounds · CPC title