The present invention provides a lubricating oil for a compression type refrigerator including a polyvinyl ether-based compound containing an alkylene glycol or polyoxyalkylene glycol unit and a vinyl ether unit in a molecule and having a molecular weight in a range of 300 to 3,000, and a dehydratin
The present invention provides a lubricating oil for a compression type refrigerator including a polyvinyl ether-based compound containing an alkylene glycol or polyoxyalkylene glycol unit and a vinyl ether unit in a molecule and having a molecular weight in a range of 300 to 3,000, and a dehydrating agent. The lubricating oil for a compression type refrigerator of the present invention has high miscibility and high viscosity index, and excellent in stability without degradation and alteration due to hydrolysis under carbon dioxide atmosphere.
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1. A lubricating oil, comprising: 70% by mass or more of a polyvinyl ether-based compound containing an alkylene glycol or polyoxyalkylene glycol unit and a vinyl ether unit in a molecule, having a molecular weight in a range of 300 to 3,000 and a carbon/oxygen molar ratio of 4.0 or less, wherein th
1. A lubricating oil, comprising: 70% by mass or more of a polyvinyl ether-based compound containing an alkylene glycol or polyoxyalkylene glycol unit and a vinyl ether unit in a molecule, having a molecular weight in a range of 300 to 3,000 and a carbon/oxygen molar ratio of 4.0 or less, wherein the polyvinyl ether-based compound has a structure of formula (I): wherein R1, R2, and R3 each represent a hydrogen atom or a hydrocarbon group having 1 to 8 carbon atoms, which may be identical to or different from one another; Rb represents a divalent hydrocarbon group having 2 to 4 carbon atoms; Ra represents a hydrogen atom, an aliphatic or alicyclic hydrocarbon group having 1 to 20 carbon atoms, an aromatic group which has 1 to 20 carbon atoms and may have a substituent, an acyl group having 2 to 20 carbon atoms, or an oxygen-containing hydrocarbon group having 2 to 50 carbon atoms; R4 represents a hydrocarbon group having 1 to 10 carbon atoms; when plural Ras, Rbs, and R4s are present, they may be identical to or different from one another; m represents an average value of 15 to 21; k represents a number of 1 to 50; p represents a number of 2 to 50; and when plural ks and ps are present, units may be in block or in random; and when plural RbOs are present, they may be identical to or different from one another; and0.5 to 5% by mass of a dehydrating agent, wherein said dehydrating agent is at least one selected from the group consisting of N,N′-dimethylcarbodiimide, N,N′-diisopropylcarbodiimide, N,N′-diisobutylcarbodiiimide, N,N′-dihexylcarbodilmide, N,N-dioctylcarbodiimide, N,N′-dioctadecylcarbodiimide, N,N′-dicyclohexylcarbodiimide, N,N′-diphenylcarobodiimide, N,N′-naphthylcarbodlimide, and N,N′-isopropylphenylcarbodiimide. 2. The lubricating oil according to claim 1, which has a kinematic viscosity at 100° C. in the range of 1 to 50 mm2/s. 3. The lubricating oil according to claim 1, which has a viscosity index of 80 or more. 4. The lubricating oil according to claim 1, which is used for a natural refrigerant. 5. The lubricating oil according to claim 4, wherein the natural refrigerant is one of a carbon dioxide refrigerant, an ammonia refrigerant, and a hydrocarbon refrigerant, or a combination thereof. 6. A refrigeration unit, comprising: a compression type refrigerator for a natural refrigerant, which includes at least a compressor, a condenser, an expansion mechanism, and an evaporator;a natural refrigerant; andthe lubrication oil according to claim 4. 7. The refrigeration unit according to claim 6, wherein the natural refrigerant is a carbon dioxide refrigerant. 8. The lubricating oil according to claim 1, wherein p is ranges from 2 to 25 in formula (I). 9. A refrigeration composition comprising the lubricating oil according to claim 1 and a refrigerant. 10. The refrigeration composition according to claim 9, wherein the refrigerant is a HFC (hydrofluorocarbon) refrigerant. 11. The refrigeration composition according to claim 10, wherein the HFC refrigerant is at least one selected from the group consisting of R134a, R410A, R404A, and R407C. 12. The refrigeration composition according to claim 9, wherein the refrigerant is mixture of natural refrigerant and a HFC refrigerant. 13. The refrigeration composition according to claim 12, wherein the HFC refrigerant is at least one selected from the group consisting of R134a, R410A, R404A, and R407C. 14. The lubricating oil according to claim 1, wherein the carbon/oxygen molar ratio ranges from 2.50 to 4.0. 15. The lubricating oil according to claim 14, wherein the carbon/oxygen molar ratio ranges from 2.50 to 3.78. 16. The lubricating oil according to claim 1, wherein the carbodiimide compound is at least one selected from the group consisting of N,N′-diisopropylcarbodiimide, N,N′-dihexylcarbodiimide, N,N′-dicyclohexylcarbodiimide, N,N′-isopropylphenylcarbodiimide, and N,N′-dioctadecylcarbodiimide. 17. A lubricating oil, comprising: 70% by mass or more of a polyvinyl ether-based compound having a molecular weight in the range of 300 to 3,000, and a carbon/oxygen molar ratio of 4.0 or less, wherein the polyvinyl ether-based compound has a structure of formula (I): wherein R1, R2, and R3 each represent a hydrogen atom or a hydrocarbon group having 1 to 8 carbon atoms, which may be identical to or different from one another; Rb represents a divalent hydrocarbon group having 2 to 4 carbon atoms; Ra represents a hydrogen atom, an aliphatic or alicyclic hydrocarbon group having 1 to 20 carbon atoms, an aromatic group which has 1 to 20 carbon atoms and may have a substituent, an acyl group having 2 to 20 carbon atoms, or an oxygen-containing hydrocarbon group having 2 to 50 carbon atoms; R4 represents a hydrocarbon group having 1 to 10 carbon atoms; when plural Ras, Rbs, and R4s are present, they may be identical to or different from one another; m represents an average value of 15 to 21; k represents a number of 1 to 50; p represents a number of 2 to 50; and when plural ks and ps are present, units may be in block or in random; and when plural RbOs are present, they may be identical to or different from one another, and0.5 to 5% by mass of a dehydrating agent, wherein said dehydrating agent is at least one selected from the group consisting of N,N′-dimethylcarbodiimide, N,N′-diisopropylcarbodiimide, N,N′-diisobutylcarbodiiimide, N,N′-dihexylcarbodilmide, N,N-dioctylcarbodiimide, N,N′-dioctadecylcarbodiimide, N,N′-dicyclohexylcarbodiimide, N,N′-diphenylcarobodiimide, N,N′-naphthylcarbodlimide, and N,N′-isopropylphenylcarbodiimide,wherein said polyvinyl ether-based compound is obtained by polymerizing vinyl ether-based compounds in the presence of a polymerization initiator wherein at least one of the polymerization initiator and the vinyl ether-based compound comprises an alkylene glycol residue or a polyoxyalkylene glycol residue. 18. The lubricating oil according to claim 17, wherein p is ranges from 2 to 25 in formula (I). 19. The lubricating oil according to claim 17, which has a kinematic viscosity at 100° C. in the range of 1 to 50 mm2/s. 20. The lubricating oil according to claim 17, which has a viscosity index of 80 or more. 21. The lubricating oil according to claim 17, which is used for a natural refrigerant. 22. The lubricating oil according to claim 21, wherein the natural refrigerant is one of a carbon dioxide refrigerant, an ammonia refrigerant, and a hydrocarbon refrigerant, or a combination thereof. 23. A refrigeration unit, comprising: a compression type refrigerator for a natural refrigerant, which includes at least a compressor, a condenser, an expansion mechanism, and an evaporator;a natural refrigerant; andthe lubrication oil according to claim 21. 24. The refrigeration unit according to claim 23, wherein the natural refrigerant is a carbon dioxide refrigerant. 25. A refrigeration composition comprising the lubricating oil according to claim 17 and a refrigerant. 26. The refrigeration composition according to claim 25, wherein the refrigerant is a HFC (hydrofluorocarbon) refrigerant. 27. The refrigeration composition according to claim 26, wherein the HFC refrigerant is at least one selected from the group consisting of R134a, R410A, R404A, and R407C. 28. The refrigeration composition according to claim 25, wherein the refrigerant is mixture of natural refrigerant and a HFC refrigerant. 29. The refrigeration composition according to claim 28, wherein the HFC refrigerant is at least one selected from the group consisting of R134a, R410A, R404A, and R407C. 30. The lubricating oil according to claim 17, wherein the carbon/oxygen molar ratio ranges from 2.50 to 4.0. 31. The lubricating oil according to claim 30, wherein the carbon/oxygen molar ratio ranges from 2.50 to 3.78. 32. The lubricating oil according to claim 17, wherein the carbodiimide compound is at least one selected from the group consisting of N,N′-diisopropylcarbodiimide, N,N′-dihexylcarbodiimide, N,N′-dicyclohexylcarbodiimide, N,N′-isopropylphenylcarbodiimide, and N,N′-dioctadecylcarbodiimide.
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