Working fluid composition for refrigerator, refrigeration oil, and method for producing same

Patent metadata

Field	Value
Publication number	US-9243177-B2
Application number	US-201314381800-A
Country	US
Kind code	B2
Filing date	Feb 28, 2013
Priority date	Mar 2, 2012
Publication date	Jan 26, 2016
Grant date	Jan 26, 2016

Abstract

The working fluid composition for a refrigerating machine of the present invention comprises: a refrigerating machine oil comprising a mineral oil and an alkylbenzene in a mass ratio, the mineral oil/the alkylbenzene, of 85/15 to 15/85, wherein the mineral oil has a % C N by n-d-M ring analysis of 20 to 60, a pour point of −15° C. or less and a kinematic viscosity at 40° C. of 1.5 to 15 mm 2 /s; and a hydrocarbon refrigerant having 2 to 4 carbon atoms, wherein the refrigerating machine oil having a kinematic viscosity at 40° C. of 2 to 12 mm 2 /s and a flash point of 120° C. or more.

First claim

The invention claimed is:

1. A working fluid composition for a refrigerating machine comprising:
a refrigerating machine oil comprising a mineral oil and an alkylbenzene in a mass ratio, the mineral oil/the alkylbenzene, of 15/85 to 60/40, wherein the mineral oil has a % C N by n-d-M ring analysis of 20 to 60, a pour point of −15° C. or less and a kinematic viscosity at 40° C. of 1.5 to 15 mm 2 /s; and
a hydrocarbon refrigerant having 2 to 4 carbon atoms,
the refrigerating machine oil having a kinematic viscosity at 40° C. of 2 to 12 mm 2 /s and a flash point of 120° C. or more.

2. The working fluid composition for a refrigerating machine according to claim 1 , wherein the alkylbenzene is a linear alkylbenzene in which a linear alkyl group is bonded to a benzene ring, and wherein a kinematic viscosity at 40° C. of the alkylbenzene is 2to 10 mm 2 /s.

3. The working fluid composition for a refrigerating machine according to claim 1 , wherein the % C N by the n-d-M ring analysis of the mineral oil is 40 to 60.

4. The working fluid composition for a refrigerating machine according to claim 1 , further comprising at least one glycerin derivative selected from an ester compound of glycerin and an ether compound of glycerin, wherein a content of the glycerin derivative is 0.005 to 1.0% by mass based on a total amount of the refrigerating machine oil.

5. The working fluid composition for a refrigerating machine according to claim 1 , further comprising at least one phosphorus compound selected from a mono(alkylphenyl) diphenyl phosphate having one alkyl group having 3 to 5 carbon atoms, a di(alkylphenyl) phenyl phosphate having two alkyl groups having 3 to 5 carbon atoms, and a tri(alkylphenyl) phosphate having three alkyl groups having 3 to 5 carbon atoms, wherein a content of the phosphorus compound is 0.05 to 3.0% by mass based on a total amount of the refrigerating machine oil.

6. The working fluid composition for a refrigerating machine according to claim 1 , wherein the hydrocarbon refrigerant is isobutane.

7. A refrigerating machine oil for use with a hydrocarbon refrigerant having 2 to 4 carbon atoms, comprising:
a mineral oil and an alkylbenzene, in a mass ratio, the mineral oil/the alkylbenzene, of 15/85 to 60/40, wherein the mineral oil has a % C N by n-d-M ring analysis of 20 to 60, a pour point of −15° C. or less and a kinematic viscosity at 40° C. of 1.5 to 15 mm 2 /s,
the refrigerating machine oil having a kinematic viscosity at 40° C. of 2 to 12 mm 2 /s and a flash point of 120° C. or more.

8. A method for manufacturing a refrigerating machine oil for use with a hydrocarbon refrigerant having 2 to 4 carbon atoms, comprising:
mixing a mineral oil and an alkylbenzene in a mass ratio, the mineral oil/the alkylbenzene, of 15/85 to 60/40, to obtain a refrigerating machine oil comprising a mixed oil of the mineral oil and the alkylbenzene as a base oil and having a kinematic viscosity at 40° C. of 2 to 12 mm 2 /s and a flash point of 120° C. or more, wherein the mineral oil has a % C N by n-d-M ring analysis of 20 to 60, a pour point of −15° C. or less and a kinematic viscosity at 40° C. of 1.5 to 15 mm 2 /s.

Assignees

• Jx Nippon Oil & Energy Corp

Inventors

• Saito Masanori
• Nara Fumiyuki
• Matsumoto Tomonari
• ADEGAWA Kuniko

Classifications

• C10N2040/30

  Refrigerators lubricants {or compressors lubricants} · CPC title

• C10M2207/046

  Hydroxy ethers · CPC title

• C10N2030/08

  Resistance to extreme temperature · CPC title

• C10M2203/1006

  used as base material · CPC title

• C10N2020/02

  Viscosity; Viscosity index · CPC title