Classifications

• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
  • C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
  • C09K5/02—Materials undergoing a change of physical state when used
  • C09K5/04—Materials undergoing a change of physical state when used the change of state being from liquid to vapour or vice versa
  • C09K5/041—Materials undergoing a change of physical state when used the change of state being from liquid to vapour or vice versa for compression-type refrigeration systems
  • C09K5/042—Materials undergoing a change of physical state when used the change of state being from liquid to vapour or vice versa for compression-type refrigeration systems comprising compounds containing carbon and hydrogen only
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M171/00—Lubricating compositions characterised by purely physical criteria, e.g. containing as base-material, thickener or additive, ingredients which are characterised exclusively by their numerically specified physical properties, i.e. containing ingredients which are physically well-defined but for which the chemical nature is either unspecified or only very vaguely indicated
  • C10M171/008—Lubricant compositions compatible with refrigerants
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
  • C09K2205/00—Aspects relating to compounds used in compression type refrigeration systems
  • C09K2205/10—Components
  • C09K2205/12—Hydrocarbons
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
  • C10M2203/10—Petroleum or coal fractions, e.g. tars, solvents, bitumen
  • C10M2203/1006—Petroleum or coal fractions, e.g. tars, solvents, bitumen used as base material
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  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
  • C10M2203/10—Petroleum or coal fractions, e.g. tars, solvents, bitumen
  • C10M2203/104—Aromatic fractions
  • C10M2203/1045—Aromatic fractions used as base material
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
  • C10M2203/10—Petroleum or coal fractions, e.g. tars, solvents, bitumen
  • C10M2203/106—Naphthenic fractions
  • C10M2203/1065—Naphthenic fractions used as base material
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
  • C10M2205/02—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers
  • C10M2205/028—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers containing aliphatic monomers having more than four carbon atoms
  • C10M2205/0285—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers containing aliphatic monomers having more than four carbon atoms used as base material
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
  • C10M2205/22—Alkylation reaction products with aromatic type compounds, e.g. Friedel-crafts
  • C10M2205/223—Alkylation reaction products with aromatic type compounds, e.g. Friedel-crafts used as base material
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
  • C10M2207/04—Ethers; Acetals; Ortho-esters; Ortho-carbonates
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
  • C10M2207/04—Ethers; Acetals; Ortho-esters; Ortho-carbonates
  • C10M2207/046—Hydroxy ethers
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
  • C10M2207/28—Esters
  • C10M2207/283—Esters of polyhydroxy compounds
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
  • C10M2207/28—Esters
  • C10M2207/287—Partial esters
  • C10M2207/289—Partial esters containing free hydroxy groups
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2223/00—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions
  • C10M2223/02—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions having no phosphorus-to-carbon bonds
  • C10M2223/04—Phosphate esters
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2223/00—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions
  • C10M2223/02—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions having no phosphorus-to-carbon bonds
  • C10M2223/04—Phosphate esters
  • C10M2223/041—Triaryl phosphates
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
  • C10N2020/00—Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
  • C10N2020/01—Physico-chemical properties
  • C10N2020/02—Viscosity; Viscosity index
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
  • C10N2020/00—Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
  • C10N2020/09—Characteristics associated with water
  • C10N2020/097—Refrigerants
  • C10N2020/103—Containing Hydrocarbons
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
  • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
  • C10N2030/02—Pour-point; Viscosity index
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
  • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
  • C10N2030/06—Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
  • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
  • C10N2030/08—Resistance to extreme temperature
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
  • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
  • C10N2030/10—Inhibition of oxidation, e.g. anti-oxidants
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
  • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
  • C10N2030/60—Electro rheological properties
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
  • C10N2040/00—Specified use or application for which the lubricating composition is intended
  • C10N2040/30—Refrigerators lubricants or compressors lubricants

Definitions

• the present invention relates to a working fluid for refrigerating machines and a refrigerating machine oil (lubricating oil for refrigerating machines) using a hydrocarbon having an extremely low global warming potential and environmentally friendly hydrocarbons such as ethane, propane, butane, isobutane and the like, and its More particularly, the present invention relates to a refrigerating machine oil that is highly reliable and compatible with the system, and that does not cause wear even when the viscosity is lowered for power saving of the refrigeration system.
• chlorofluorocarbons such as R-11 (trichloromonofluoromethane) and R-12 (dichlorodifluoromethane), and hydrochlorofluorocarbons (HCFC) such as R-22 (monochlorodifluoromethane). and so on.
• CFC chlorofluorocarbons
• HCFC hydrochlorofluorocarbons
• HFC does not destroy the ozone layer, it has a large greenhouse effect and is not necessarily an excellent refrigerant from the viewpoint of global warming, which has become a problem in recent years.
• hydrocarbon refrigerants have a global warming potential (GWP) of 1/100 or less compared to R410A, which is a mixed refrigerant of hydrofluorocarbon (HFC) that is widely used as a refrigerant for room air conditioners. Also good.
• propane (R290) having 3 carbon atoms may be able to significantly reduce the impact on global warming without making a major design change of the room air conditioner.
• refrigerating machine oils for lower hydrocarbon refrigerants for example, naphthenic or paraffinic mineral oils, alkylbenzene oils, ester oils, ether oils, and fluorinated oils that are compatible with the refrigerants have been proposed (see Patent Document 1). ).
• alkylbenzene oil which is a synthetic hydrocarbon, is expected as a refrigeration oil that can save power when used in a reciprocating compressor (see Patent Document 2).
• polyol ester (POE) etc. are proposed as ester oil (refer patent document 3).
• the present invention has been made in view of the above problems of the prior art, has a sufficiently high flash point that can ensure safety even when the viscosity is lowered, and has an appropriate compatibility with a hydrocarbon refrigerant,
• An object of the present invention is to provide a refrigerating machine oil that can maintain an oil film thickness that does not impair lubricity and has excellent stability and electrical insulation, a method for producing the refrigerating machine oil, and a working fluid composition for a refrigerating machine that uses the refrigerating machine oil. To do.
• the present inventors have found that a low-viscosity oil in which a specific mineral oil containing a relatively large amount of naphthene rings and a synthetic hydrocarbon, alkylbenzene, is blended in a certain range ratio, Complementing each weak point, there is no safety problem, moderate compatibility with hydrocarbon refrigerants, good lubricity, high stability, low moisture absorption, carbonization of propane, isobutane, etc.
• the present invention has been completed by finding out that it is excellent as a refrigerating machine oil for hydrogen refrigerant.
• the present invention provides a working fluid composition for a refrigerator described in [1] to [6] below, a refrigerator oil described in [7] below, and a method for producing the refrigerator oil described in [8] below.
• n-d-M ring% C N in the analysis 20 to 60 it is -15 ° C. or less pour point
• mineral oil is a kinematic viscosity at 40 ° C. is 1.5 ⁇ 15mm 2 / s
• alkylbenzene A refrigerating machine oil containing the mineral oil / the alkylbenzene at a mass ratio of 85/15 to 15/85, a kinematic viscosity at 40 ° C.
• a working fluid composition for a refrigerator comprising: [2] The refrigerator according to [1], wherein the alkylbenzene is a linear alkylbenzene having a linear alkyl group bonded to a benzene ring, and the kinematic viscosity at 40 ° C. of the alkylbenzene is 2 to 10 mm 2 / s.
• Working fluid composition. [3]% C N in n-d-M ring analysis of the mineral oil is 40-60 [1] or refrigerant working fluid composition according to [2].
• It further contains at least one glycerin derivative selected from an ester compound of glycerin and an ether compound of glycerin, and the content of the glycerin derivative is 0.005 to 1.0 mass based on the total amount of the refrigerating machine oil.
• the working fluid composition for a refrigerator according to any one of [1] to [3], which is%.
• a method for producing a refrigerating machine oil for hydrocarbon refrigerant having 2 to 4 carbon atoms comprising a step of obtaining a refrigerating machine oil having a temperature of 120 ° C or higher.
• the present invention has a sufficiently high flash point that can ensure safety even when the viscosity is lowered, has an appropriate compatibility with a hydrocarbon refrigerant, and can maintain an oil film thickness that does not impair lubricity. It is possible to provide a refrigerating machine oil having excellent stability and electrical insulation, a method for producing the refrigerating machine oil, and a working fluid composition for a refrigerating machine using the refrigerating machine oil.
• the flash point is 120. °C or higher, no safety problems, moderate compatibility with hydrocarbon refrigerants, good lubricity, which is an important characteristic, high electrical insulation, low hygroscopicity, and high stability. Therefore, a special effect of being excellent in overall performance as a refrigerating machine oil is exhibited.
• the manufacturing method of the first hydrocarbon refrigerant refrigeration machine oil having 2 to 4 carbon atoms according to the embodiment of the present invention, n-d-M% in ring analysis C N 20-60, pour point -15 ° C.
• the sliding part is often an elastohydrodynamic lubrication region, and it is necessary to select a base material having a high viscosity pressure coefficient in order to keep the oil film thick in this region.
• the% C N in n-d-M ring analysis of mineral oil 20 to 60, preferably of 35 to 50, more preferably in the range of 40-50.
• the% CN is preferably in the range of 35 to 60, more preferably 40 to 60. If the% C N value of the mineral oil is within the range, if the pressure in the refrigerating machine oil due to the load at the sliding portion is applied, it is possible to increase viscosity, thickening the oil film.
• the n-d-M% in ring analysis C N in the present invention means a value measured in accordance with ASTM D3238.
• the pour point of mineral oil is ⁇ 15 ° C. or lower, preferably ⁇ 25 ° C. or lower, more preferably ⁇ 40 ° C. or lower, from the viewpoint of the low temperature characteristics required for refrigerating machine oil.
• the pour point as used in the field of this invention means the value measured based on JISK2269.
• the kinematic viscosity of mineral oil at 40 ° C. is 1.5 to 15 mm 2 / s, preferably 3 to 10 mm 2 / s, and more preferably 3 to 7 mm 2 / s from the viewpoint of power saving.
• the kinematic viscosity at 40 ° C. in the present invention refers to a value measured according to JIS K2283.
• a lubricating oil fraction obtained by subjecting crude oil to atmospheric distillation and / or vacuum distillation is subjected to solvent removal, solvent extraction, hydrorefining, hydrocracking, hydrogenation.
• mineral oil refined alone or in combination of two or more of refining treatments such as isomerization, solvent dewaxing, catalytic dewaxing, sulfuric acid washing, and clay treatment,% in ndM ring analysis
• refining treatments such as isomerization, solvent dewaxing, catalytic dewaxing, sulfuric acid washing, and clay treatment
• % in ndM ring analysis examples include C N , pour point, and kinematic viscosity at 40 ° C. within the above ranges.
• the process conditions the vacuum distillation for the kinematic viscosity, n-d-M solvent extraction for% C N in ring analysis, hydrorefining, the processing conditions of the hydrocracking, the pour point can be set within the set range depending on the processing conditions of hydroisomerization, solvent dewaxing, and catalytic dewaxing.
• the refrigerating machine oil according to this embodiment further contains alkylbenzene in addition to the above mineral oil.
• alkylbenzene in addition to the above mineral oil.
• any of branched alkylbenzene in which the alkyl group bonded to the benzene ring is a branched alkyl group and linear alkylbenzene in which the alkyl group bonded to the benzene ring is a linear alkyl group may be used. Since the change in viscosity due to temperature is small, linear alkylbenzene is preferred.
• the number of carbon atoms of the alkyl group is preferably 1 to 30, more preferably 4 to 20, from the viewpoint of achieving a viscosity suitable as a lubricating base oil. Further, the number of alkyl groups contained in one molecule of alkylbenzene is preferably 1 to 4, more preferably 1 to 3, in order to keep the viscosity within a set range depending on the number of carbon atoms of the alky
• Kinematic viscosity at 40 ° C. of alkylbenzenes, the refrigerating machine oil after additive formulations from the viewpoint of low viscosity and power saving type preferably 3 ⁇ 10mm 2 / s, more preferably 4 ⁇ 9mm 2 / s, 4 ⁇ 6mm 2 / s is more preferable.
• the mass ratio of the specific mineral oil to the alkylbenzene is 85/15 to 15/85, preferably 70/30 to 30/70, more preferably 60/40 to 40/60.
• the flash point is lowered with the lowering of the viscosity of the refrigerating machine oil due to the characteristics of the mineral oil having a molecular weight distribution, which may not be used for the actual production of the refrigerating compressor.
• the amount of alkylbenzene exceeds the above range, the compatibility with the organic material in the compressor may be lowered due to the characteristics of the alkylbenzene.
• the mixing method of mineral oil and alkylbenzene both are hydrocarbon oils, so it can be done by the usual lubricating oil blending method. Alternatively, a mass processing distribution method of mixing may be used.
• the kinematic viscosity at 40 ° C. of the refrigerating machine oil according to this embodiment is 2 to 12 mm 2 / s, more preferably 2 to 8 mm 2 / s, and further preferably 4 to 6 mm 2 / s from the viewpoint of power saving. It is.
• the flash point of the refrigerating machine oil according to the present embodiment is 120 ° C. or higher, preferably 125 ° C. or higher, more preferably 130 ° C. or higher, from the viewpoint of safety.
• the refrigerating machine oil according to this embodiment may be composed of a mixed base oil of the specific mineral oil and alkylbenzene, but may further contain the following base oil and additives as necessary.
• the content of the mixed base oil is preferably 90% by mass or more, more preferably 95% by mass or more, based on the total amount of refrigerating machine oil. is there.
• the refrigerating machine oil according to the present embodiment is an ester such as a polyol ester (POE) or a diester, an ether such as a polyalkylene glycol (PAG) or a polyvinyl ether (PVE), or the above specific one, as long as the function as a refrigerating machine oil is satisfied.
• an ester such as a polyol ester (POE) or a diester
• PEG polyalkylene glycol
• PVE polyvinyl ether
• Mineral oils other than mineral oils, and hydrocarbon-based synthetic oils other than alkylbenzenes such as polyalphaolefin (PAO) can be mixed as appropriate.
• the refrigerating machine oil according to this embodiment can further contain a compound having an oily effect.
• a compound having an oily effect at least one glycerin derivative selected from an ester compound of glycerin and an ether compound of glycerin is easily adsorbed on the surface of the sliding material, has no influence on stability, and has an effect of wear resistance. Is preferable because it is large.
• the ester compound of glycerin is preferably an ester compound (partial ester) in which all of the hydroxyl groups do not form an ester bond, and the carboxylic acid constituting the ester is preferably a fatty acid, particularly a fatty acid having 12 to 20 carbon atoms.
• Examples include glycerol monooleate and glycerol monolaurate.
• the ether compound of glycerin is preferably an ether compound in which all of the hydroxyl groups do not form an ether bond, preferably glycerol alkyl ether or glycerol alkenyl ether.
• the alkyl group or alkenyl group preferably has 12 to 20 carbon atoms. Examples include glycerol monooleyl ether and glycerol monolauryl ether.
• the content of the glycerin derivative is preferably 0.005 to 1.0% by mass, more preferably 0.01 to 0.5% by mass, and still more preferably 0.02 to 1.0% by mass based on the total amount of refrigerating machine oil. 0.2% by mass.
• the content is less than the lower limit, the wear resistance effect tends to be small, and when the content exceeds the upper limit, precipitation of the additive at low temperatures tends to occur.
• the refrigerating machine oil according to this embodiment preferably further contains a phosphorus compound from the viewpoint of improving the wear resistance.
• phosphorus compounds include mono (alkylphenyl) diphenyl phosphate having one alkyl group having 3 to 5 carbon atoms, di (alkylphenyl) phenyl phosphate having two alkyl groups having 3 to 5 carbon atoms, and 3 carbon atoms.
• Particularly preferred is at least one phosphorus compound selected from tri (alkylphenyl) phosphates having 3 to 5 alkyl groups.
• di (alkylphenyl) diphenyl phosphate having two alkyl groups having 3 to 5 carbon atoms examples include di (isopropylphenyl) phenyl phosphate, di (tert.-butylphenyl) phenyl phosphate, and di (n-butylphenyl). ) Phenyl phosphate.
• tri (alkylphenyl) diphenyl phosphate having three alkyl groups having 3 to 5 carbon atoms examples include tri (isopropylphenyl) phosphate, tri (tert.-butylphenyl) phosphate, and tri (n-butylphenyl) phosphate. Fate etc. are mentioned.
• any one of the above-mentioned mono (alkylphenyl) diphenyl phosphate, di (alkylphenyl) phenyl phosphate and tri (alkylphenyl) phosphate may be used, or a mixture of two or more kinds May be used.
• the content of the phosphorus compound is preferably 0.05 to 3.0% by mass, more preferably 0.1 to 2.0% by mass, and still more preferably 0.2 to 1%, based on the total amount of refrigerating machine oil. 0.0% by mass.
• the content is less than the lower limit, the wear resistance effect tends to be small, and when the content exceeds the upper limit, the stability of the refrigerating machine oil tends to decrease.
• triphenyl phosphate (TPP) or tricresyl phosphate (TCP) may be used as the phosphorus compound, but although TPP and TCP have an effect of wear resistance, the friction coefficient is increased. There is a tendency.
• TPP and TCP have an effect of wear resistance
• the friction coefficient is increased. There is a tendency.
• the friction coefficient is It can be kept low, which is preferable in terms of power saving.
• the refrigerating machine oil according to the present embodiment is preferably added with a stability improving additive in order to further improve the stability of the mixture of the refrigerant and the refrigerating machine oil in actual use.
• a stability improvement additive at least 1 sort (s) chosen from a hindered phenol compound, an aromatic amine compound, an epoxy compound, or carbodiimide is preferable, and it is more preferable to add together an epoxy compound and carbodiimide. It is sufficient to add these additives in a total amount of 0.05 to 5.0% by weight, based on the total amount of refrigerating machine oil.
• hindered phenol compounds 2,6-di-tert. -Butylphenol, 2,6-di-tert. -Butyl-p-cresol, 4,4-methylene-bis- (2,6-di-tert.-butyl-p-cresol) and the like are aromatic amine compounds such as ⁇ -naphthylamine, p, p′-di
• the epoxy compound octyl-diphenylamine and the like
• glycidyl ether group-containing compounds epoxidized fatty acid monoesters, epoxidized oils and fats, epoxycycloalkyl group-containing compounds and the like are suitable.
• additives such as antiwear agents such as organic sulfur compounds, oily agents such as alcohol and higher fatty acids, metal deactivators such as benzotriazole derivatives, and antifoaming agents such as silicone oil can be added as appropriate.
• the refrigerating machine oil according to this embodiment can be preferably used as a lubricating oil for a refrigerating machine in which a hydrocarbon refrigerant having 2 to 4 carbon atoms is used.
• the refrigerating machine oil according to the present embodiment when applied to a refrigerator in which isobutane is used as a refrigerant, it has characteristics of refrigerating machine oil suitable for a motor built-in type (sealed type) compressor, that is, high electrical insulation. It is also necessary. Therefore, the refrigerating machine oil of the present invention preferably has a volume resistivity of 10 9 ⁇ ⁇ m or more after the additive is blended.
• the volume resistivity in this invention means the value measured based on JISC2101.
• the said volume resistivity means the volume resistivity of the refrigerating machine oil after mix
• Working Fluid Composition for Refrigerator Working fluid composition for a refrigerating machine according to a second embodiment of the present invention,% in n-d-M ring analysis C N 20-60, pour point -15 ° C. or less, 1 kinematic viscosity at 40 ° C..
• hydrocarbon refrigerant having 2 to 4 carbon atoms in the present embodiment examples include ethane, propane, n-butane, and isobutane.
• isobutane (R600a) is used for refrigerators
• propane (R290) has been studied for practical use for room air conditioners.
• these hydrocarbon refrigerants are preferably used. it can.
• the working fluid composition for a refrigerator according to the present embodiment can achieve power saving by reducing the viscosity of the refrigerator oil, it is used for a refrigerator in which a reciprocating compressor having a large effect is mainly used. It can be said that it is particularly suitable for an isobutane refrigerant.
• the content ratio of the refrigerant and the refrigerating machine oil is not particularly limited, but the refrigerant / refrigerating machine oil is preferably 10/90 to 90/10, and 30/70 to 70. / 30 is more preferable.
• Examples 2 to 10, Comparative Examples 1 to 6 refrigeration oils having the compositions shown in Tables 1 to 4 were obtained using the above-described mineral oils A and LAB, and the mineral oils and additives shown below, respectively.
• Tables 1 to 4 show the kinematic viscosity, flash point and pour point of the obtained refrigerating machine oil at 40 ° C. (Base oil)
• Mineral oil C 40 kinematic viscosity at ° C. is 8.7 mm 2 / s, a flash point of 130 °C, n-d-M % in ring analysis C N is 57, a pour point of -50 ° C. or less of mineral oil (JX Nippon Oil & VG8 base oil manufactured by Energy Co., Ltd.)
• PAO 40 kinematic viscosity at ° C. is 5.2 mm 2 / s, a flash point of 194 °C, n-d-M ring analysis of% C N is 11, a pour point of -50 ° C.
• GMO Glycerol monooleate
• GMOE Glycerol monooleyl ether
• TBPP tert. -Butylphenyl phosphate (a mixture of tert.-butylphenyl diphenyl phosphate and di (tert.-butylphenyl) phenyl phosphate in a mass ratio of 2/1
• the Falex seizure load was measured at an initial temperature of 50 ° C. and 290 rpm in a controlled atmosphere (70 ml / min) of refrigerant R600a.
• the Falex wear test is performed at 50 ° C., 290 rpm, the running-in operation is performed at a load of 50 Lbf for 5 minutes, the test is performed at a load of 100 Lbf for 1 hour, and the total value (mg) of the vane and block wear after the test is Indicated.
• the test load was set low so that the condition from the mixed lubrication region to the mild boundary lubrication region was obtained. The results obtained are shown in Tables 5 and 6.
• sample oil (20 g), refrigerant R600a (20 g) and catalyst (iron, copper, and aluminum wires) are sealed in a stainless steel cylinder (100 ml) and heated to 175 ° C. After holding for 14 days, the hue (ASTM display) and acid value of the test oil were measured. The results obtained are shown in Tables 5 and 6.
• the refrigeration oils of Examples 1 to 10 all have a flash point of 120 ° C. or higher, and the lubricity is a constant seizure load level despite the low viscosity, and the wear amount is also low. Less than 10 mg and good.
• the lubricity of Examples 5, 6, and 10 blended with antiwear additives is good, but when using the low-viscosity refrigerating machine oil of the present invention, freezing is performed so that the sliding portion remains in the elastic fluid lubrication region. It is desirable from the aspect of long-term reliability to design the machine and prevent wear with the oil film thickness.
• the refrigerating machine oil of the present invention is used as a lubricating oil for a refrigerating machine using a hydrocarbon refrigerant having 2 to 4 carbon atoms such as isobutane, and in particular, a compressor, a condenser, a throttling device (such as an expansion valve or a capillary tube). (Refrigerant flow control unit), evaporator, etc., and a cooling system with high cooling efficiency and low power consumption that circulates refrigerant between them, especially reciprocating type, rotary type, scroll type, screw type, etc. It can be used as a lubricating oil in a refrigerator having a compressor, and can be suitably used for a refrigerator, a room air conditioner, an industrial refrigerator, and the like.

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