Lubricant for compression refrigerating machine and refrigerating apparatus using the same

A lubricating oil for a compression type refrigerator, 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 and having a molecular weight in a range of 300 to 3,000;
• and
• 0. 01 to 5% by mass of glycidyl laurate,
• wherein the polyvinyl ether-based compound has a carbon/oxygen molar ratio of 4.0 or less and has a structure represented by the general 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 15-21;
• k represents a number of 1 to 50;
• p represents a number of 2 to 50;
• when plural ks and ps are present, units may be in block or in random form;
• and
• when plural RbOs are present, they may be identical to or different from one another.

A lubricating oil for a compression type refrigerator, comprising:

• 70% by mass or more of a polyvinyl ether-based compound having a molecular weight in the range of 300 to 3,000, obtained by polymerizing vinyl ether-based compounds in the presence of a polymerization initiator and
• 0. 01 to 5% by mass of an epoxy compound selected from the group consisting of a glycidyl ether having 5 to 30 carbon atoms and an α-olefin oxide having 8 to 50 carbon atoms,
• wherein at least one of the polymerization initiator and the vinyl ether-based compound 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 and has a structure represented by the general 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 15-21;
• k represents a number of 1 to 50;
• p represents a number of 2 to 50;
• when plural ks and ps are present, units may be in block or in random form;
• and
• when plural RbOs are present, they may be identical to or different from one another.

A lubricating oil for a compression type refrigerator, comprising:

• 70% by mass or more of a polyvinyl ether-based compound having a molecular weight in the range of 300 to 3,000, obtained by polymerizing vinyl ether-based compounds in the presence of a polymerization initiator and
• 0. 01 to 5% by mass of glycidyl laurate,
• wherein at least one of the polymerization initiator and the vinyl ether-based compound 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 and has a structure represented by the general 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 les are present, they may be identical to or different from one another;
• m represents an average value of 15-21;
• k represents a number of 1 to 50;
• p represents a number of 2 to 50;
• when plural ks and ps are present, units may be in block or in random form;
• and
• when plural RbOs are present, they may be identical to or different from one another.