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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, a metal deactiva

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, a metal deactivator, and at least one kind phosphorous compound selected from a phosphate and a phosphite. The lubricating oil for a compression type refrigerator of the present invention has high miscibility and high viscosity index, and is excellent in anti-seizure property and corrosion stability under carbon dioxide atmosphere.

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1. A lubricating oil for a compression type refrigerator, comprising: a compound of a polyvinyl ether 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;a metal deactivator comprising a triazole,

1. A lubricating oil for a compression type refrigerator, comprising: a compound of a polyvinyl ether 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;a metal deactivator comprising a triazole, andat least one phosphite compound having 10 to 80 carbon atoms,wherein the polyvinyl ether-based compound has a carbon/oxygen molar ratio of 4.0 or less, andwherein the lubricating oil has a viscosity index of 90 or more. 2. A lubricating oil for a compression type refrigerator, comprising: a compound of a polyvinyl ether having a molecular weight in the range of 300 to 3,000, obtained by polymerizing compounds of a vinyl ether in the presence of a polymerization initiator;a metal deactivator comprising a triazole, andat least one phosphite compound having 10 to 80 carbon atoms,wherein at least one of the polymerization initiator and the compound of a vinyl ether comprises an alkylene glycol residue or a polyoxyalkylene glycol residue,wherein the polyvinyl ether-based compound has a carbon/oxygen molar ratio of 4.0 or less, andwherein the lubricating oil has a viscosity index of 90 or more. 3. The lubricating oil for a compression type refrigerator according to claim 1, wherein the compound of a polyvinyl ether has a structure represented by formula (I): whereinR1, 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, a substituted aromatic group which has 1 to 20 carbon atoms, 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 1 to 50;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; andwhen plural RbOs are present, they may be identical to or different from one another. 4. The lubricating oil for a compression type refrigerator according to claim 3, wherein m is 2 or more. 5. The lubricating oil for a compression type refrigerator according to claim 1, wherein the compound of a polyvinyl ether has a structure represented by formula (II): RC—[[(ORd)a-(A)b-(ORf)e]c—Re]d  (II)whereinRc represents 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 1 to 10 carbon atoms and having 2 to 6 binding sites;each of Rd and Rf represents an alkylene group having 2 to 4 carbon atoms;each of a and e represents an average value of 0 to 50;c represents an integer of 1 to 20;Re represents a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, or an acyl group having 2 to 10 carbon atoms; andwhen a, e, or a and e is 2 or more, (ORd) and (A), (ORf) and (A), or (ORd), (ORf) and (A) may be in random or in block;(A) is represented by formula (III): whereinR5, R6, and R7 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;R8 represents a divalent hydrocarbon group having 1 to 10 carbon atoms or a divalent hydrocarbon group containing ether-bonded oxygen and having 2 to 20 carbon atoms;R9 represents a hydrogen atom or a hydrocarbon group having 1 to 20 carbon atoms;n represents an average value of 0 to 10;when plural ns are present, constitutional units may be identical to or different from one another;R5 to R9 may be identical to or different from one another in every constitutional unit;and when plural R8Os are present, they may be identical to or different from one another;b is 3 or more, d is an integer of 1 to 6;when a is zero, n represents an integer of 1 or more in one of the constitutional units (A). 6. The lubricating oil for a compression type refrigerator according to claim 1, wherein the compound of a polyvinyl ether has a structure represented by formula (IV): RC—[(ORd)a-(A)b-(ORf)e]d—Rg  (IV)whereinRc represents 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 1 to 10 carbon atoms and having 2 to 6 binding sites;each of Rd and Rf represents an alkylene group having 2 to 4 carbon atoms;(A) is represented by formula (III): whereinR5, R6, and R7 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;R8 represents a divalent hydrocarbon group having 1 to 10 carbon atoms or a divalent hydrocarbon group containing ether-bonded oxygen and having 2 to 20 carbon atoms;R9 represents a hydrogen atom or a hydrocarbon group having 1 to 20 carbon atoms;n represents an average value of 0 to 10;when plural ns are present, constitutional units may be identical to or different from one another;R5 to R9 may be identical to or different from one another in every constitutional unit;and when plural R8Os are present, they may be identical to or different from one another;each of a and e represents an average value of 0 to 50;b is 3 or more;d is an integer of 1 to 6; andwhen a is zero, n represents an integer of 1 or more in one of the constitutional units (A);Rg represents a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, an acyl group having 2 to 10 carbon atoms, or a hydrocarbon group having 1 to 10 carbon atoms and having 2 to 6 binding sites;when a, e, or a and e is 2 or more, ORd and A, ORf and A, or ORd, ORf, and A may be in random or in block; andwhen both a and e are zero, n represents an integer of 1 or more in one of the structural units A. 7. The lubricating oil for a compression type refrigerator according to claim 1, wherein the compound of a polyvinyl ether is a block or random copolymer which comprises: (a) a constitutional unit represented by formula (III): whereinR5, R6, and R7 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;R8 represents a divalent hydrocarbon group having 1 to 10 carbon atoms or a divalent hydrocarbon group containing ether-bonded oxygen and having 2 to 20 carbon atoms;R9 represents a hydrogen atom or a hydrocarbon group having 1 to 20 carbon atoms;n represents an average value of 0 to 10;when plural ns are present, constitutional units may be identical to or different from one another;R5 to R9 may be identical to or different from one another in every constitutional unit; andwhen plural R8Os are present, they may be identical to or different from one another; and(b) a constitutional unit represented by formula (V): whereinR10 to R13 each represent a hydrogen atom or a hydrocarbon group having 1 to 20 carbon atoms, which may be identical to or different from one another; andR19 to R13 may be identical to or different from one another in every constitutional unit. 8. The lubricating oil for a compression type refrigerator according to claim 5, wherein Rc is a hydrogen atom, and a=0. 9. The lubricating oil for a compression type refrigerator according to claim 6, wherein Rc is a hydrogen atom and a=0. 10. The lubricating oil for a compression type refrigerator according to claim 5, wherein all of R5 to R7 are hydrogen atoms in (A), n is an average value of 0 to 4 and one of them is 1 or more, and R8 is a divalent hydrocarbon group having 2 to 4 carbon atoms. 11. The lubricating oil for a compression type refrigerator according to claim 6, wherein all of R5 to R7 are hydrogen atoms in (A), n is an average value of 0 to 4 and one of them is 1 or more, and R8 is a divalent hydrocarbon group having 2 to 4 carbon atoms. 12. The lubricating oil for a compression type refrigerator according to claim 1, which has a kinematic viscosity at 100° C. in the range of 1 to 50 mm2/s. 13. A refrigerant-lubricating oil combination for a compression type refrigerator comprising the lubricating oil according to claim 1, and a natural refrigerant. 14. The refrigerant-lubricating oil combination for a compression type refrigerator according to claim 13, wherein the natural refrigerant is one of carbon dioxide, ammonia, and a hydrocarbon, or a combination thereof. 15. A refrigeration unit, comprising: a compression type refrigerator for a natural refrigerant, which comprises at least a compressor, a condenser, an expansion mechanism, and an evaporator;a natural refrigerant; andthe lubrication oil for a compression type refrigerator according to claim 13. 16. The lubricating oil for a compression type refrigerator according to claim 1, wherein the phosphite compound is a phosphonic diester or a phosphonic triester, and having 20 to 60 carbon atoms. 17. The lubricating oil for a compression type refrigerator according to claim 1, wherein the phosphite compound is dioleylhydrogen phosphite or trisnonylphenyl phosphite. 18. The lubricating oil for a compression type refrigerator according to claim 1, wherein the phosphite compound is present in an amount of 0.001 to 5% by mass. 19. The lubricating oil for a compression type refrigerator according to claim 16, wherein the phosphite compound is a phosphonic triester. 20. The lubricating oil for a compression type refrigerator according to claim 17, wherein the phosphite compound is trisnonylphenyl phosphite.