Working fluid composition for refrigerator, and refrigerator oil

Patent metadata

Field	Value
Publication number	US-10053647-B2
Application number	US-201415106532-A
Country	US
Kind code	B2
Filing date	Dec 22, 2014
Priority date	Dec 25, 2013
Publication date	Aug 21, 2018
Grant date	Aug 21, 2018

Abstract

The present invention provides a working fluid composition for a refrigerating machine, comprising a refrigerating machine oil that comprises an ester of a polyhydric alcohol and a fatty acid, an epoxy compound, and a phosphorus compound, and a fluoropropene refrigerant, wherein the polyhydric alcohol constituting the ester comprises pentaerythritol and dipentaerythritol, the fatty acid constituting the ester comprises at least one selected from fatty acids having 4 to 9 carbon atoms, and the epoxy compound and the phosphorus compound satisfy a condition represented by the following formula (1).

[

Formula
⁢

⁢
1

]

⁢

0.10
≤

(

N
E

M
E

·

W
E

)

(

N
P

M
P

·

W
P

)

≤
1.50

(
1
)

First claim

The invention claimed is:

1. A working fluid composition for a refrigerating machine, comprising:
a refrigerating machine oil comprising an ester of a polyhydric alcohol and a fatty acid, an epoxy compound, and a phosphorus compound; and
a fluoropropene refrigerant,
wherein the polyhydric alcohol constituting the ester comprises pentaerythritol and dipentaerythritol,
the fatty acid constituting the ester comprises at least one selected from fatty acids having 4 to 9 carbon atoms, and
the epoxy compound and the phosphorus compound satisfy a condition represented by the following formula (1):

[

Formula
⁢

⁢
1

]

⁢

0.10
≤

(

N
E

M
E

·

W
E

)

(

N
P

M
P

·

W
P

)

≤
1.50

(
1
)

wherein N E represents a number of epoxy groups per one molecule of the epoxy compound, M E represents a molecular weight of the epoxy compound, W E represents a content of the epoxy compound based on a total amount of the refrigerating machine oil, N P represents a number of phosphorus atoms per one molecule of the phosphorus compound, M P represents a molecular weight of the phosphorus compound, and W P represents a content of the phosphorus compound based on the total amount of the refrigerating machine oil.

2. The working fluid composition for a refrigerating machine according to claim 1 , wherein the ester comprises a mixture of a first ester being an ester of pentaerythritol and at least one fatty acid selected from fatty acids having 4 to 9 carbon atoms and a second ester being an ester of dipentaerythritol and at least one fatty acid selected from fatty acids having 4 to 9 carbon atoms.

3. The working fluid composition for a refrigerating machine according to claim 2 , wherein a content of the second ester is 10% by mass or more and 40% by mass or less based on a, total of a content of the first ester and the content of the second ester.

4. The working fluid composition for a refrigerating machine according to claim 1 , further comprising 0.1% by mass or more and 0.4% by mass or less of 2,6-di-tert.-butyl-p-cresol based on the total amount of the refrigerating machine oil.

5. The working fluid composition for a refrigerating machine according to claim 1 , wherein the fluoropropene refrigerant is at least one selected from 1,3,3,3-tetrafluoropropene (HFO-1234ze) and 2,3,3,3-tetrafluoropropene (HFO-1234yf).

6. A refrigerating machine oil comprising:
an ester of a polyhydric alcohol and a fatty acid;
an epoxy compound; and
a phosphorus compound,
the refrigerating machine oil being used with a fluoropropene refrigerant,
wherein the polyhydric alcohol constituting the ester comprises pentaerythritol and dipentaerythritol,
the fatty acid constituting the ester comprises at least one selected from fatty acids having 4 to 9 carbon atoms, and
the epoxy compound and the phosphorus compound satisfy a condition represented by the following formula (1):

[

Formula
⁢

⁢
2

]

⁢

0.10
≤

(

N
E

M
E

·

W
E

)

(

N
P

M
P

·

W
P

)

≤
1.50

(
1
)

wherein N E represents a number of epoxy groups per one molecule of the epoxy compound, M E represents a molecular weight of the epoxy compound, W E represents a content of the epoxy compound based on a total amount of the refrigerating machine oil, N P represents a number of phosphorus atoms per one

Assignees

• Denso Corp
• Toyota Jidoshokki Kk
• Jx Nippon Oil & Energy Corp
• Kabushki Kaisha Toyota Jidoshokki

Inventors

• Muto Masataka
• Mukawa Hajime
• Kano Takekazu
• Hayashi Genki
• Yamamoto Kazuki
• Hoshida Takahiro
• Takahashi Hitoshi
• Sawada Ken
• Tada Akira
• Konno Souichirou

Classifications

• C10N2040/30

  Refrigerators lubricants {or compressors lubricants} · CPC title

• C10M2207/042

  Epoxides · CPC title

• C10M2223/047

  Thioderivatives not containing metallic elements · CPC title

• C10M137/04

  Phosphate esters · CPC title

• C09K5/045

  containing only fluorine as halogen · CPC title