Refrigerator oil

Patent metadata

Field	Value
Publication number	US-10836975-B2
Application number	US-201515522633-A
Country	US
Kind code	B2
Filing date	Oct 23, 2015
Priority date	Nov 4, 2014
Publication date	Nov 17, 2020
Grant date	Nov 17, 2020

Abstract

The present invention provides a refrigerating machine oil comprising: a base oil; a compound represented by the following formula (1):

wherein R 1 and R 2 each independently represent a monovalent hydrocarbon group, R 3 represents a divalent hydrocarbon group and R 4 represents a hydrogen atom or a monovalent hydrocarbon group; and an epoxy compound.

First claim

The invention claimed is:

1. A refrigerating machine oil comprising:
a base oil;
a compound represented by the following formula (1):

wherein R 1 and R 2 each independently represent a monovalent hydrocarbon group, R 3 represents a divalent hydrocarbon group and R 4 represents a hydrogen atom or a monovalent hydrocarbon group; and
an epoxy compound consisting of at least one selected from the group consisting of glycidyl ether type epoxy compounds, glycidyl ester type epoxy compounds, and oxirane compounds;
wherein the base oil consists of an ester of a polyhydric alcohol and a fatty acid,
wherein the polyhydric alcohol comprises at least one selected from the group consisting of neopentylglycol, trimethylolethane, trimethylolpropane, trimethylolbutane, di-(trimethylolpropane), tri-(trimethylolpropane), pentaerythritol and dipentaerythritol, and
the fatty acid comprises at least one selected from the group consisting of butanoic acid, pentanoic acid, hexanoic acid, heptanoic acid, octanoic acid, nonanoic acid, decanoic acid, undecanoic acid, dodecanoic acid, tridecanoic acid, tetradecanoic acid, pentadecanoic acid, hexadecanoic acid, heptadecanoic acid, octadecanoic acid, nonadecanoic, eicosanoic acid, 2-methylpropanoic acid, 2-methylbutanoic acid, 2-methylpentanoic acid, 2-methylhexanoic acid, 2-ethylpentanoic acid, 2-methylheptanoic acid, 2-ethylhexanoic acid, 3,5,5-trimethylhexanoic acid, and 2-ethylhexadecanoic acid, and
wherein a content of the compound represented by the formula (1) is 0.001% by mass or more and 3% by mass or less, a content of the epoxy compound is 0.1% by mass or more and 5.0% by mass or less, and a content of the base oil is 80% by mass or more based on a total amount of the refrigerating machine oil.

2. The refrigerating machine oil according to claim 1 , wherein the compound represented by the formula (1) and the epoxy compound satisfy a condition represented by the following formula (2):

0.5
≤

(

N
E

M
E

·

W
E

)

(

N
S

M
S

·

W
S

)

≤
80

(
2
)

wherein N E represents the number of epoxy groups per 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 S represents the number of sulfur atoms per molecule of the compound represented by the formula (1), M S represents a molecular weight of the compound represented by the formula (1), and W S represents a content of the compound represented by the formula (1) based on a total amount of the refrigerating machine oil.

3. The refrigerating machine oil according to claim 1 , wherein a content of the compound represented by the formula (1) is 0.01% by mass or more and 3% by mass or less, and a content of the epoxy compound is 0.1% by mass or more and 5.0% by mass or less, based on a total amount of the refrigerating machine oil.

4. The refrigerating machine oil according to claim 3 , wherein the ester is an ester of a polyhydric alcohol and a fatty acid,
wherein the polyhydric alcohol comprises pentaerythritol or a mixed alcohol of pentaerythritol and dipentaerythritol, and
the fatty acid comprises at least one selected from the group consisting of 2-methylpropanoic acid, 2-methylbutanoic acid, 2-methylpentanoic acid, 2-methylhexanoic acid, 2-ethylpentanoic acid, 2-methylheptanoic acid, 2-ethylhexanoic acid, and 3,5,5-trimethylhexanoic acid.

5. The refrigerating machine oil according to claim 4 , wherein R 1 and R 2 in formula (1) each independently represents an alkyl group having 1 or more and 10 or less of carbons.

6. The refrigerating machine oil according to claim 5 , wherein R 4 in formula (1) represents a hydrogen atom.

7. A refrigerating machine oil comprising:
a base oil comprising an ester;
a compound represented by the following formula (1):

wherein R 1 and R 2 each independently represent a monovalent hydrocarbon group, R 3 represents a divalent hydrocarbon group and R 4 represents a hydrogen atom or a monovalent hydrocarbon group; and
an epoxy compound consisting of at least one selected from the group consisting of glycidyl ether type epoxy compounds, glycidyl ester type epoxy compounds, and oxirane compounds,
wherein the ester is an ester of a polyhydric alcohol and a fatty acid,
wherein the polyhydric alcohol comprises at least one selected from the group consisting of neopentylglycol, trimethylolethane, trimethylolpropane, trimethylolbutane, di-(trimethylolpropane), tri-(trimethylolpropane), pentaerythritol and dipentaerythritol, and
the fatty acid comprises at least one selected from the group consisting of butanoic acid, pentanoic acid, hexanoic acid, heptanoic acid, octanoic acid, nonanoic acid, decanoic acid, undecanoic acid, dodecanoic acid, tridecanoic acid, tetradecanoic acid, pentadecanoic acid, hexadecanoic acid, heptadecanoic acid, octadecanoic acid, nonadecanoic, eicosanoic acid, 2-methylpropanoic acid, 2-methylbutanoic acid, 2-methylpentanoic acid, 2-methylhexanoic acid, 2-ethylpentanoic acid, 2-methylheptanoic acid, 2-ethylhexanoic acid, 3,5,5-trimethylhexanoic acid, and 2-ethylhexadecanoic acid, and,

wherein a content of the compound represented by the formula (1) is 0.001% by mass or more and 3% by mass or less, a content of the epoxy compound is 0.1% by mass or more and 5.0% by mass or less, and a content of the base oil is 80% by mass or more based on a total amount of the refrigerating machine oil.

8. The refrigerating machine oil according to claim 7 , wherein the compound represented by formula (1) and the epoxy compound satisfy a condition represented by the following formula (2):

0.5

Assignees

• Eneos Corp

Inventors

• Takahashi Hitoshi
• Yamaguchi Kentaro
• Konno Souichirou
• Nara Fumiyuki

Classifications

• C10N2030/70

  Soluble oils · CPC title

• C10M129/66

  Epoxidised acids or esters · CPC title

• C10N2040/30

  Refrigerators lubricants {or compressors lubricants} · CPC title

• C10M107/32

  Condensation polymers of aldehydes or ketones; Polyesters; Polyethers · CPC title

• C10M171/008 Primary

  Lubricant compositions compatible with refrigerants · CPC title