Lubricating oil composition for refrigerating machines

Patent metadata

Field	Value
Publication number	US-9828567-B2
Application number	US-201715444552-A
Country	US
Kind code	B2
Filing date	Feb 28, 2017
Priority date	Mar 30, 2012
Publication date	Nov 28, 2017
Grant date	Nov 28, 2017

Abstract

A lubricating oil composition for refrigerating machines contains a base oil and an additive in a form of a naphthalimide compound. A refrigerant used in a refrigerating machine in which the composition is used is unsaturated hydrofluorocarbon (unsaturated HFC) having a GWP of 1000 or less. When the present lubricating oil composition for refrigerating machines is used in refrigerating equipment such as an open-type automobile air-conditioner, an electric automobile air-conditioner, a gas heat pump, other air-conditioning equipment, a refrigerating machine, a vending machine, a showcase, a water-heating system and a refrigerating/heating system, it is possible to detect the leakage of a refrigerant with a long-lasting stability. Therefore, when an unsaturated fron refrigerant with a poor stability is used in the above-listed equipment, the present lubricating oil composition for refrigerating machines is significantly advantageous.

First claim

The invention claimed is:

1. A refrigerant composition, comprising:
(a) a lubricating oil composition comprising
(a1) a base oil, and
(a2) at least one naphthalimide compound; and

(b) a refrigerant comprising a mixture of a saturated hydrofluorocarbon and an unsaturated hydrofluorocarbon having a GWP of 1000 or less,
wherein
(1) the base oil (a1) comprises at least one compound selected from the group consisting of a polyvinylether, a polyalkylene glycol, a polyol ester, and an ether compound represented by formula (1):
Ra—[(ORb) n -(B)—(OR c ) k ] x -R d   (1)

wherein:
Ra and Rd each, independently, represent a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, an acyl group having 2 to 10 carbon atoms, or a hydrocarbon group having 2 to 6 bonds and having 1 to 10 carbon atoms;
Rb and Rc each, independently, represent an alkylene group having 2 to 4 carbon atoms;
n and k each, independently, are an integer of 0 to 20;
x is an integer of 1 to 6;
(B) represents a polymer portion having 3 or more monomer units represented by formula (2):

wherein:
R 4 , R 5 and R 6 each, independently, represent a hydrogen atom or a hydrocarbon group having 1 to 8 carbon atoms and are mutually the same or different;
R 7 represents a divalent hydrocarbon group having 1 to 10 carbon atoms or a divalent ether-bonded oxygen-containing hydrocarbon group having 2 to 20 carbon atoms;
R 8 represents a hydrogen atom or a hydrocarbon group having 1 to 20 carbon atoms;
m is a number with an average of 0 to 10 and plural m are mutually the same or different in each unit;
R 4 to R 8 are mutually the same or different in each unit;
plural R 7 O are mutually the same or different; and
m in formula (2) is an integer of 1 or more when k and n in formula (1) are both 0;

(2) the naphthalimide compound (a2) is represented by formula (6):

wherein R 1 and R 2 are, independently, selected from the group consisting of a hydrogen atom, a saturated hydrocarbon, an unsaturated hydrocarbon, and an aromatic hydrocarbon, and

(3) the refrigerant composition comprises 0.001 mass % to 10 mass % of the naphthalimide compound (a2), based on the total amount of the lubricating oil composition (a).

2. A refrigerant composition, comprising:
(a) a lubricating oil composition comprising
(a1) a base oil, and
(a2) at least one naphthalimide compound; and

(b) a refrigerant comprising a mixture of an unsaturated hydrofluorocarbon having a GWP of 1000 or less and a fluorine-comprising organic compound represented by a formula (A):
C p O q F r R s   (A),

wherein:
R represents Cl, Br, I, or hydrogen;
p is an integer of 1 to 6;
q is an integer of 0 to 2;
r is an integer of 1 to 14; and
s is an integer of 0 to 13
with the proviso that when q is 0, p is an integer of 2 to 6 and one or more unsaturated carbon-carbon bonds are contained in a molecule,

wherein
(1) the base oil (a1) comprises at least one compound selected from the group consisting of a polyvinylether, a polyalkylene glycol, a polyol ester, and an ether compound represented by formula (1):
Ra—[(ORb) n -(B)—(OR c ) k ] x -R d   (1)

wherein:
Ra and Rd each, independently, represent a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, an acyl group having 2 to 10 carbon atoms, or a hydrocarbon group having 2 to 6 bonds and having 1 to 10 carbon atoms;
Rb and Rc each, independently, represent an alkylene group having 2 to 4 carbon atoms;
n and k each, independently, are an integer of 0 to 20;
x is an integer of 1 to 6;
(B) represents a polymer portion having 3 or more monomer units represented by formula (2):

wherein:
R 4 , R 5 and R 6 each, independently, represent a hydrogen atom or a hydrocarbon group having 1 to 8 carbon atoms and are mutually the same or different;
R 7 represents a divalent hydrocarbon group having 1 to 10 carbon atoms or a divalent ether-bonded oxygen-containing hydrocarbon group having 2 to 20 carbon atoms;
R 8 represents a hydrogen atom or a hydrocarbon group having 1 to 20 carbon atoms;
m is a number with an average of 0 to 10 and plural m are mutually the same or different in each unit;
R 4 to R 8 are mutually the same or different in each unit;
plural R 7 O are mutually the same or different; and
m in formula (2) is an integer of 1 or more when k and n in formula (1) are both 0;

(2) the naphthalimide compound (a2) is represented by formula (6):

wherein R 1 and R 2 are, independently, selected from the group consisting of a hydrogen atom, a saturated hydrocarbon, an unsaturated hydrocarbon, and an aromatic hydrocarbon, and

(3) the refrigerant composition comprises 0.001 mass % to 10 mass % of the naphthalimide compound (a2), based on the total amount of the lubricating oil composition (a).

3. The refrigerant composition according to claim 1 , wherein the HFC having the GWP of 1000 or less is an unsaturated HFC having 3 carbon atoms.

4. The refrigerant composition according to claim 2 , wherein the HFC having the GWP of 1000 or less is an unsaturated HFC having 3 carbon atoms.

5. The refrigerant composition according to claim 1 , comprising from 0.1 mass % to 10 mass % of the naphthalimide compound (a2), based on a total amount of the lubricating oil composition (a).

6. The refrigerant composition according to claim 2 , comprising from 0.1 mass % to 10 mass % of the naphthalimide compound (a2), based on a total amount of the lubricating oil composition (a).

7. The refrigerant composition according to claim 1 , wherein the lubricating oil composition (a) has a kinematic viscosity at 100 degrees C. in a range from 1 mm 2 /s to 50 mm2/s.

8. The refrigerant composition according to claim 2 , wherein the lubricating oil composition (a) has a kinematic viscosity at 100 degrees C. in a range from 1 mm 2 /s to 50 mm 2 /s.

9. The refrigerant composition according to claim 1 , wherein the base oil (a1) further comprises at least one additive selected from among an extreme pressure agent, an oiliness agent, an antioxidant, an acid scavenger, a metal deactivator, and an antifoaming agent.

10. The refrigerant composition according to claim 2 , wherein the base oil (a1) further comprises at least one additive selected from among an extreme pressure agent, an oiliness agent, an antioxidant, an acid scavenger, a metal deactivator, and an antifoaming agent.

11. The refrigerant composition according to claim 1 , wherein the refrigerant consists of the saturated hydrofluorocarbon and the unsaturated hydrofluorocarbon having a GWP of 1000 or less.

12. The refrigerant composition according to claim 2 , wherein the refrigerant consists of the unsaturated hydrofluorocarbon having a GWP of 1000 or less and the fluorine-comprising organic compound represented by the formula (A).

Assignees

• Idemitsu Kosan Co

Inventors

• Matsumoto Tomoya

Classifications

• C10N2040/42

  Flashing oils or marking oils · CPC title

• C10N2020/103

  Containing Hydrocarbons · CPC title

• C10M2207/042

  Epoxides · CPC title

• C10M171/008 Primary

  Lubricant compositions compatible with refrigerants · CPC title

• C10M2207/2835

  used as base material · CPC title