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Provided is a lubricant composition for a refrigerator having the following characteristics: the composition being used for a refrigerator using a refrigerant having a specific structure such as an unsaturated fluorinated hydrocarbon compound serving as a refrigerant having a low global warming pote

Provided is a lubricant composition for a refrigerator having the following characteristics: the composition being used for a refrigerator using a refrigerant having a specific structure such as an unsaturated fluorinated hydrocarbon compound serving as a refrigerant having a low global warming potential and usable particularly in current air-conditioning system for cars; the composition having excellent stability as well as excellent compatibility with the refrigerant; the composition including a base oil containing a polyoxyalkylene glycol derivative as a main component and 1 to 20% by mass of a monoepoxy compound based on the total amount of the composition; and the refrigerator using a refrigerant containing at least one kind of fluorine-containing organic compound selected from compounds represented by the molecular formula (A) CpOqFrRs or including a combination of the fluorine-containing organic compound and a saturated fluorinated hydrocarbon compound.

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1. A composition, comprising: (i) a lubricant comprising (a) a base oil consisting of at least one polyoxyalkylene glycol derivative and (b) at least one monoepoxy compound selected from the group consisting of an α-olefin oxide having 12 carbon atoms, an α-olefin oxide having 14 carbon atoms and an

1. A composition, comprising: (i) a lubricant comprising (a) a base oil consisting of at least one polyoxyalkylene glycol derivative and (b) at least one monoepoxy compound selected from the group consisting of an α-olefin oxide having 12 carbon atoms, an α-olefin oxide having 14 carbon atoms and an α-olefin oxide having 16 carbon atoms, wherein the monoepoxy compound is present in an amount of 2.5 to 10% by mass, based on the total mass of the lubricant; and(ii) a refrigerant consisting of 2,3,3,3-tetrafluoropropene (HFC1234yf),wherein the polyoxyalkylene glycol derivative comprises a compound represented by the formula (I): R1—[(OR2)m—OR3]n  (I) wherein R1 represents a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, an acyl group having 2 to 10 carbon atoms, or an aliphatic hydrocarbon group having 2 to 6 binding sites and 1 to 10 carbon atoms;R2 represents an alkylene group having 2 to 4 carbon atoms;R3 represents a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, or an acyl group having 2 to 10 carbon atoms;n represents an integer of 1 to 6;m represents a number with which an average value of m×n is 8 to 80; andwhen a plurality of OR2's are present, the plurality of OR2's may be identical to or different from each other, and when a plurality of [(OR2)m—OR3]'s are present, the plurality of [(OR2)m—OR3]'s may be identical to or different from each other. 2. The composition according to claim 1, wherein the base oil has a kinematic viscosity of 2 to 50 mm2/s at 100° C. 3. The composition according to claim 1, wherein the base oil has a molecular weight of 500 or more. 4. The composition according to claim 1, wherein the polyoxyalkylene glycol derivative comprises a monool-based and/or diol-based polyoxyalkylene glycol derivative. 5. The composition according to claim 1, further comprising at least one additive selected from the group consisting of an extreme pressure agent, an oiliness agent, an antioxidant, a metal deactivator, and an anti-foaming agent. 6. The composition according to claim 1, wherein the mass ratio of the refrigerant to the lubricant is 99/1 to 10/90. 7. The composition according to claim 1, wherein the mass ratio of the refrigerant to the lubricant is 95/5 to 30/70. 8. The composition according to claim 1, wherein the monoepoxy compound is an α-olefin oxide having 12 carbon atoms. 9. The composition according to claim 1, wherein the monoepoxy compound is an α-olefin oxide having 14 carbon atoms. 10. The composition according to claim 1, wherein the monoepoxy compound is an α-olefin oxide having 16 carbon atoms. 11. A refrigerator comprising the composition according to claim 1, wherein the refrigerator contains a friction part formed of an engineering plastic or comprises an organic coating film or an inorganic coating film. 12. The refrigerator according to claim 11, wherein the organic coating film is a polytetrafluoroethylene coating film, a polyimide coating film, a polyamideimide coating film, or a thermosetting insulating film formed from a resin coating material comprising a resin base material comprising a polyhydroxyether resin and a polysulfone-based resin, and a cross-linking agent. 13. The refrigerator according to claim 11, wherein the inorganic coating film is a graphite film, a diamond-like carbon film, a tin film, a chromium film, a nickel film, or a molybdenum film. 14. A hot-water supplying system or refrigeration and heating system for car air conditioners, an electric air conditioners for cars, a gas heat pump, an air conditioner, a refrigerator, a vending machine, or a showcase, comprising the composition according to claim 1. 15. The system according to claim 14, wherein a water content in the system is 300 ppm by mass or less and residual partial pressure in the system is 10 kPa or less. 16. A hot-water supplying system or refrigeration and heating system for car air conditioners, an electric air conditioners for cars, a gas heat pump, an air conditioner, a refrigerator, a vending machine, or a showcase, comprising the composition according to claim 14, wherein a water content in a system is 300 ppm by mass or less and a residual air partial pressure in the system is 10 kPa or less.