Claims
- 1. A lubricant composition for a compression-type refrigerating machine, said composition comprising at least one refrigerant selected from the group consisting of 1,1,1,2-tetrafluoroethane (R-134a), 1,1,2,2-tetrafluoroethane (R-134), pentafluoroethane (R-125), difluoromethane (R-32) and 1,1,1-trifluoroethane (R-143a), and a lubricant comprising (A) 60 to 90% by weight of a synthetic oil composed of (A-1) at least one member selected from the group consisting of a poly-.alpha.-olefin and an ethylene/.alpha.-olefin copolymer or (A-2) a mixture of an alkylbenzene and at least one member selected from the group consisting of a poly-.alpha.-olefin and an ethylene/.alpha.-olefin copolymer and (B) 10 to 40% by weight of a fluidity improver composed of a polyoxyalkylene glycol compound.
- 2. The lubricant composition according to claim 1, wherein said poly-.alpha.-olefin is a polymer of an .alpha.-olefin having 8 to 14 carbon atoms and a kinematic viscosity of 10 to 350 cSt at 40.degree. C.
- 3. The lubricant composition according to claim 2, wherein said polymer of an .alpha.-olefin is a polymer of 1-dodecene, 1-decene or 1-octene, each having a kinematic viscosity of 10 to 350 cSt at 40.degree. C.
- 4. The lubricant composition according to claim 1, wherein said ethylene/.alpha.-olefin copolymer is a copolymer of ethylene and an .alpha.-olefin selected from the group consisting of propylene, 1-butene, 1-hexene, 1-octene, 1-decene and 1-dodecene.
- 5. The lubricant composition according to claim 1, wherein said alkylbenzene is selected from the group consisting of a soft alkylbenzene and a hard alkylbenzene, each having a kinematic viscosity of 10 to 350 cSt at 40.degree. C.
- 6. The lubricant composition according to claim 1, wherein said mixture of the alkylbenzene and at least one member selected from the group consisting of a poly-.alpha.-olefin and an ethylene/.alpha.-olefin copolymer has an olefinic polymer content of 5 to 90% by weight of the mixture.
- 7. The lubricant composition according to claim 1, wherein said fluidity improver as the component (B) has a kinematic viscosity of 3 to 50 cSt at 40.degree. C.
- 8. The lubricant composition according to claim 1, wherein said polyoxyalkylene glycol compound is represented by the general formula (I):
- R.sup.1 [(OR.sup.2).sub.m OR.sup.3 ].sub.n (I)
- wherein R.sup.1 is a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an alkynyl group having 2 to 10 carbon atoms, an aryl group having 6 to 10 carbon atoms, an aralkyl group having 7 to 10 carbon atoms, an acyl group having 2 to 10 carbon atoms or an aliphatic hydrocarbon group having 2 to 6 bonding links; R.sup.2 is an alkylene group having 2 to 6 carbon atoms; R.sup.3 is a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an alkynyl group having 2 to 10 carbon atoms, an aryl group having 6 to 10 carbon atoms, an aralkyl group having 7 to 10 carbon atoms or an acyl group having 2 to 10 carbon atoms; n is an integer of 1 to 6; and m is a figure satisfying that the average value of m.times.n is 2 to 40.
- 9. The lubricant composition according to claim 1, wherein said polyoxyalkylene glycol compound contains 50% or more by mole of same or different alkylene groups each having at least 4 carbon atoms per oxyalkylene unit and 50% or less by mole of same or different alkylene groups each having 2 to 3 carbon atoms per oxyalkylene unit for each molecule.
- 10. The lubricant composition according to claim 1, wherein said polyoxyalkylene glycol compound is a mixture of 50% to 100% by mole of said compound containing same or different alkylene groups each having at least 4 carbon atoms per oxyalkylene unit and 50% to 0% by mole of said compound containing same or different alkylene groups each having 2 to 3 carbon atoms per oxyalkylene unit.
- 11. The lubricant composition according to claim 1, wherein said polyoxyalkylene glycol compound contains at least one constitutional unit represented by the general formula (II): ##STR3## wherein R.sup.4 is a monovalent hydrocarbon group having 1 to 10 carbon atoms; and R.sup.5 to R.sup.9 are each a hydrogen atom or a monovalent hydrocarbon group having 1 to 10 carbon atoms.
- 12. The lubricant composition according to claim 1, wherein said polyoxyalkylene glycol compound is a polyoxypropylene glycol compound, a polyoxybutylene glycol compound, a polyoxypentylene glycol compound or a polyoxyhexylene glycol compound.
- 13. The lubricant composition according to claim 1, wherein said fluidity improver of component (B) comprises 50% or more of at least one compound selected from the group consisting of a polyoxybutylene glycol compound, a polyoxypentylene glycol compound and a polyoxyhexylene glycol compound.
- 14. The lubricant composition according to claim 1, wherein said polyoxyalkylene glycol compound contains oxybutylene units, oxypentylene units and oxyhexylene units to make a total of 50 or more among oxyalkylene units forming the compound.
- 15. The lubricant composition according to claim 1, wherein said refrigerant is R-134a.
- 16. The lubricant composition according to claim 1, wherein said refrigerant is R-125.
- 17. The lubricant composition according to claim 1, wherein said refrigerant is R-143a.
- 18. The lubricant composition according to claim 1, wherein said refrigerant is a mixture of R-134a and R-125.
- 19. The lubricant composition according to claim 1, wherein said refrigerant is a mixture of R-134a and R-32.
- 20. The lubricant composition according to claim 1, wherein said refrigerant is a mixture of R-134a, R-125 and R-32.
- 21. The lubricant composition according to claim 1, wherein said refrigerant is a mixture of R-143a and R-125.
- 22. The lubricant composition according to claim 1, wherein said refrigerant is a mixture of R-143a, R- 125 and R- 134a.
Priority Claims (2)
Number |
Date |
Country |
Kind |
4-30528 |
Feb 1992 |
JPX |
|
5-027906 |
Feb 1993 |
JPX |
|
Parent Case Info
CROSS-REFERENCE TO RELATED APPLICATION
This is a continuation-in-part application of application, Ser. No. 08/018,136, filed Feb. 18, 1993, now abandoned.
US Referenced Citations (4)
Foreign Referenced Citations (1)
Number |
Date |
Country |
0377122 |
Jul 1990 |
EPX |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
18136 |
Feb 1993 |
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