A lubricating oil for a compression-type refrigerator using a hydrofluorocarbon refrigerant including a polyvinyl ether-based compound containing in the molecule an alkylene glycol unit or a polyoxyalkylene glycol unit and a polyvinyl ether unit and having a molecular weight in the range of 300 to 3
A lubricating oil for a compression-type refrigerator using a hydrofluorocarbon refrigerant including a polyvinyl ether-based compound containing in the molecule an alkylene glycol unit or a polyoxyalkylene glycol unit and a polyvinyl ether unit and having a molecular weight in the range of 300 to 3,000, and a refrigeration apparatus using the lubricating oil. The present invention can provide a lubricating oil for a compression-type refrigerator having good compatibility in the atmosphere of a hydrofluorocarbon and a high viscosity index, and a refrigeration apparatus using such a lubricating oil.
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1. A method of lubricating a compression-type refrigerator with a lubricating oil, wherein said compression-type refrigerator comprises a hydrofluorocarbon refrigerant and said lubricating oil comprises a polyvinyl ether-based compound having a structure represented by the general formula (I) wherei
1. A method of lubricating a compression-type refrigerator with a lubricating oil, wherein said compression-type refrigerator comprises a hydrofluorocarbon refrigerant and said lubricating oil comprises a polyvinyl ether-based compound having a structure represented by the general formula (I) wherein R1, R2 and R3 each represent a hydrogen atom or a C1 to C8 hydrocarbon group and may be the same as or different from each other; Rb represents a divalent C2 to C4 hydrocarbon group; Ra represents a hydrogen atom, a C1 to C20 aliphatic or alicyclic hydrocarbon group, a C1 to C20 aromatic group which may have a substituent, a C2 to C20 acyl group or a C2 to C50 oxygen-containing hydrocarbon group; R4 represents a C1 to C10 hydrocarbon group; with the proviso that when there are a plurality of Ra's, a plurality of Rb's and a plurality of R4's, the Ra's, Rb's and R4's may each be the same as or different from each other; m is a number of 1 to 50 on average; k is a number of 1 to 50 on average; and p is a number of 2 to 50 on average; with the provisos that when there are a plurality of k's and a plurality of p's, the distribution may each be block or random, and that when there are a plurality of RbO's, the RbO's may be the same as or different from each other. 2. The method of lubricating a compression-type refrigerator using a hydrofluorocarbon refrigerant as defined in claim 1, wherein m in the general formula (I) is two or more. 3. The method of lubricating a compression-type refrigerator using a hydrofluorocarbon refrigerant as defined in claim 1, wherein the polyvinyl ether-based compound has a carbon/oxygen molar ratio of 4.0 or less. 4. The method of lubricating a compression-type refrigerator using a hydrofluorocarbon refrigerant as defined in claim 1, wherein the lubricating oil has a kinematic viscosity at 100° C. of 1 to 50 mm2/s. 5. The method of lubricating a compression-type refrigerator using a hydrofluorocarbon refrigerant as defined in claim 1, wherein the lubricating oil has a viscosity index of 80 or more. 6. The method of lubricating a compression-type refrigerator using a hydrofluorocarbon refrigerant as defined in claim 1, wherein the hydrofluorocarbon refrigerant is one or a combination of a saturated fluorinated hydrocarbon and a fluorinated hydrocarbon having a double bond. 7. The method of lubricating a compression-type refrigerator using a hydrofluorocarbon refrigerant as defined in claim 1, wherein the hydrofluorocarbon refrigerant is a mixed refrigerant of R404A, R407A, R407c, R407E, R410A or R507A. 8. A refrigeration apparatus comprising a compressor, a condenser, an expansion mechanism and an evaporator, wherein a hydrofluorocarbon refrigerant and a lubricating oil are circulated in said apparatus, said lubricating oil lubricating oil comprising a polyvinyl ether-based compound having a structure represented by the general formula (I) wherein R1, R2 and R3 each represent a hydrogen atom or a C1 to C8 hydrocarbon group and may be the same as or different from each other; Rb represents a divalent C2 to C4 hydrocarbon group; Ra represents a hydrogen atom, a C1 to C20 aliphatic or alicyclic hydrocarbon group, a C1 to C20 aromatic group which may have a substituent, a C2 to C20 acyl group or a C2 to C50 oxygen-containing hydrocarbon group; R4 represents a C1 to C10 hydrocarbon group; with the proviso that when there are a plurality of Ra's, a plurality of Rb's and a plurality of R4's, the Ra's, Rb's and R4's may each be the same as or different from each other; m is a number of 1 to 50 on average; k is a number of 1 to 50 on average; and p is a number of 2 to 50 on average; with the provisos that when there are a plurality of k's and a plurality of p's, the distribution may each be block or random, and that when there are a plurality of RbO's, the RbO's may be the same as or different from each other.
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이 특허에 인용된 특허 (10)
Nagao, Satoshi; Terada, Izumi; Shimizu, Nobuaki; Kaneko, Masato, Lubricant for compression type refrigerating machine and refrigerating device using same.
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