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Provided is a refrigerating machine oil composition including a base oil which contains at least one substance selected from the group consisting of monoether compounds, alkyleneglycol diethers, and polyoxyalkyleneglycol diethers having an average repetition number of an oxyalkylene group of 2 or le

Provided is a refrigerating machine oil composition including a base oil which contains at least one substance selected from the group consisting of monoether compounds, alkyleneglycol diethers, and polyoxyalkyleneglycol diethers having an average repetition number of an oxyalkylene group of 2 or less as a main component, and has a kinematic viscosity at 40° C. of 1 to 8 mm2/s. The refrigerating machine oil composition is preferably applied to refrigerators whose sliding parts are composed of an engineering plastic or provided with an organic coating film or an inorganic coating film. The refrigerating machine oil can improve energy-saving performance due to its low viscosity, has high sealing property and excellent load capacity, and is suitably used in various refrigeration applications, especially in closed-type refrigerators.

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1. A composition, comprising a refrigerant and a refrigerating machine oil composition, wherein said refrigerating machine oil composition comprises a base oil consisting of a monoether compound represented by the following general formula (I): R1—O—R2  (I)where R1 represents a monovalent hydrocarbo

1. A composition, comprising a refrigerant and a refrigerating machine oil composition, wherein said refrigerating machine oil composition comprises a base oil consisting of a monoether compound represented by the following general formula (I): R1—O—R2  (I)where R1 represents a monovalent hydrocarbon group having 7 to 25 carbon atoms, R2 represents a monovalent hydrocarbon group having 1 to 20 carbon atoms, and the total number of carbon atoms of R1 and R2 is 10 to 45,wherein the base oil has a kinematic viscosity at 40° C. of 1 to 8 mm2/s, and wherein the refrigerant consists of isobutane. 2. The composition according to claim 1, wherein the base oil has a molecular weight of 140 to 660. 3. The composition according to claim 1, wherein the base oil has a flash point of 100° C. or higher. 4. The composition according to claim 1, comprising at least one additive selected from the group consisting of an extreme-pressure agent, an oiliness agent, an antioxidant, an acid scavenger and an antifoaming agent. 5. A refrigerator comprising the composition according to claim 1. 6. The refrigerator according to claim 5, wherein the refrigerator comprises a sliding part comprising an engineering plastic, an organic coating film or an inorganic coating film. 7. The refrigerator according to claim 5, wherein the refrigerator comprises a sliding part comprising an organic coating film, wherein said organic coating film comprises a polytetrafluoroethylene coating film, a polyimide coating film, or a polyamide-imide coating film. 8. The refrigerator according to claim 5, wherein the refrigerator comprises a sliding part comprising a coating film, wherein said coating film comprises a graphite film, a diamond-like carbon film, a tin film, a chromium film, a nickel film, or a molybdenum film. 9. The composition according to claim 1, wherein in formula (I) the monovalent hydrocarbon group having 7 to 25 carbon atoms is a linear or branched alkyl group or alkenyl group. 10. The composition according to claim 1, wherein in formula (I) the monovalent hydrocarbon group having 7 to 25 carbon atoms is selected from the group consisting of an octyl group, a decyl group, a dodecyl group, a tetradecyl group, a hexadecyl group, an octadecyl group, and an icosyl group. 11. The composition according to claim 1, wherein in formula (I) the monovalent hydrocarbon group having 1 to 20 carbon atoms is a linear, branched, or cyclic alkyl group or alkenyl group each having 1 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, or an aralkyl group having 7 to 20 carbon atoms. 12. The composition according to claim 1, wherein in formula (I) the monovalent hydrocarbon group having 1 to 20 carbon atoms is selected from the group consisting of a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, a hexyl group, a heptyl group, an octyl group, a nonyl group, a decyl group, a dodecyl group, a tetradecyl group, a cyclopentyl group, a cyclohexyl group, an allyl group, a propenyl group, a butenyl group, a hexenyl group, a octenyl group, a decenyl group, a cyclopentenyl group, a cyclohexenyl group, a phenyl group, a tolyl group, a naphthyl group, a benzyl group, and a phenethyl group. 13. The composition according to claim 1, wherein the monoether compound represented by formula (I) is a compound having a total carbon atoms of 10 to 23. 14. The composition according to claim 1, wherein the monoether compound represented by formula (I) is a compound selected from the group consisting of decylmethyl ether, decylethyl ether, decylpropyl ether, decylbutyl ether, decylpentyl ether, decylhexyl ether, decyloctyl ether, didecyl ether, dodecylmethyl ether, dodecylethyl ether, dodecylpropyl ether, dodecylbutyl ether, dodecylpentyl ether, dodecylhexyl ether, dodecyloctyl ether, dodecyldecyl ether, tetradecylmethyl ether, tetradecylethyl ether, tetradecylpropyl ether, tetradecylbutyl ether, tetradecylpentyl ether, tetradecylhexyl ether, tetradecyloctyl ether, hexadecylmethyl ether, hexadecylethyl ether, hexadecylpropyl ether, hexadecylbutyl ether, hexadecylpentyl ether, hexadecylhexyl ether, octadecylmethyl ether, octadecylethyl ether, octadecylpropyl ether, and octadecylbutyl ether. 15. A method of refrigerating comprising circulating the composition of claim 1 in a refrigerator. 16. A method of refrigerating comprising circulating the composition of claim 1 in a car air-conditioner, a gas heat pump, an air conditioner, a refrigerator, an automatic vending machine, a show case, a hot water supply system, or a refrigerating and heating system.