WO2014098152A1 - Lubricant oil composition for rotary compressor - Google Patents

Lubricant oil composition for rotary compressor Download PDF

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Publication number
WO2014098152A1
WO2014098152A1 PCT/JP2013/083956 JP2013083956W WO2014098152A1 WO 2014098152 A1 WO2014098152 A1 WO 2014098152A1 JP 2013083956 W JP2013083956 W JP 2013083956W WO 2014098152 A1 WO2014098152 A1 WO 2014098152A1
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Prior art keywords
mass
lubricating oil
oil composition
rotary compressor
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PCT/JP2013/083956
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French (fr)
Japanese (ja)
Inventor
徳栄 佐藤
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出光興産株式会社
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Application filed by 出光興産株式会社 filed Critical 出光興産株式会社
Priority to KR1020157015249A priority Critical patent/KR20150096397A/en
Priority to EP13864381.2A priority patent/EP2937410A4/en
Priority to CN201380066133.2A priority patent/CN104837971A/en
Priority to US14/650,922 priority patent/US20150337231A1/en
Publication of WO2014098152A1 publication Critical patent/WO2014098152A1/en

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    • 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
    • C10M141/00—Lubricating compositions characterised by the additive being a mixture of two or more compounds covered by more than one of the main groups C10M125/00 - C10M139/00, each of these compounds being essential
    • C10M141/10—Lubricating compositions characterised by the additive being a mixture of two or more compounds covered by more than one of the main groups C10M125/00 - C10M139/00, each of these compounds being essential at least one of them being an organic phosphorus-containing compound
    • 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
    • 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
    • C10M2203/102—Aliphatic fractions
    • C10M2203/1025—Aliphatic 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
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/02—Hydroxy compounds
    • C10M2207/023—Hydroxy compounds having hydroxy groups bound to carbon atoms of six-membered aromatic rings
    • C10M2207/026—Hydroxy compounds having hydroxy groups bound to carbon atoms of six-membered aromatic rings with tertiary alkyl 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
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/26—Overbased carboxylic acid salts
    • C10M2207/262—Overbased carboxylic acid salts derived from hydroxy substituted aromatic acids, e.g. salicylates
    • 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
    • C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
    • C10M2209/02—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M2209/08—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to a carboxyl radical, e.g. acrylate type
    • C10M2209/084—Acrylate; Methacrylate
    • 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
    • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2215/02—Amines, e.g. polyalkylene polyamines; Quaternary amines
    • C10M2215/06—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to carbon atoms of six-membered aromatic rings
    • C10M2215/064—Di- and triaryl amines
    • 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
    • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2215/02—Amines, e.g. polyalkylene polyamines; Quaternary amines
    • C10M2215/06—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to carbon atoms of six-membered aromatic rings
    • C10M2215/064—Di- and triaryl amines
    • C10M2215/065—Phenyl-Naphthyl amines
    • 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
    • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2215/22—Heterocyclic nitrogen compounds
    • C10M2215/223—Five-membered rings containing nitrogen and carbon 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
    • C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
    • C10M2219/08—Thiols; Sulfides; Polysulfides; Mercaptals
    • C10M2219/082—Thiols; Sulfides; Polysulfides; Mercaptals containing sulfur atoms bound to acyclic or cycloaliphatic carbon atoms
    • C10M2219/085—Thiols; Sulfides; Polysulfides; Mercaptals containing sulfur atoms bound to acyclic or cycloaliphatic carbon atoms containing carboxyl groups; Derivatives thereof
    • 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
    • C10M2223/043—Ammonium or amine salts thereof
    • 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
    • C10M2223/045—Metal containing thio derivatives
    • 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
    • C10M2223/047—Thioderivatives not containing metallic elements
    • 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
    • C10M2223/06—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions having phosphorus-to-carbon bonds
    • 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
    • C10M2229/00—Organic macromolecular compounds containing atoms of elements not provided for in groups C10M2205/00, C10M2209/00, C10M2213/00, C10M2217/00, C10M2221/00 or C10M2225/00 as ingredients in lubricant compositions
    • C10M2229/02—Unspecified siloxanes; Silicones
    • 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
    • C10N2010/00—Metal present as such or in compounds
    • C10N2010/04—Groups 2 or 12
    • 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
    • C10N2030/04—Detergent property or dispersant property
    • 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
    • C10N2030/10—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
    • 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 lubricating oil composition for a rotary compressor.
  • the present invention relates to a lubricating oil composition for a rotary compressor capable of imparting excellent extreme pressure properties while maintaining high oxidation stability.
  • Patent Document 1 is directed to a problem related to engine oil, and does not relate to the compatibility between oxidation stability and extreme pressure in a lubricating oil for compressor oil, particularly a lubricating oil for rotary compressor.
  • Patent Document 2 is directed to a problem related to hydraulic fluid, and is not related to compatibility between oxidation stability and extreme pressure in a compressor oil, particularly a lubricating oil for a rotary compressor. That is, the subject of this invention is providing the lubricating oil composition which can provide the outstanding extreme pressure property, maintaining high oxidation stability in lubricating oil for rotary compressors.
  • Another object of the present invention is to provide a lubricating oil composition for a rotary compressor that can further suppress generation of sludge in addition to excellent oxidation stability and extreme pressure in the lubricating oil composition for a rotary compressor. To provide things.
  • the present invention [1] (a) Base oil, (b) Antioxidant, and (c) Dithiophosphate represented by the following formula (I) of 0.05% by mass or more and less than 2.0% by mass with respect to the whole composition
  • (I) Dithiophosphate represented by the following formula (I) of 0.05% by mass or more and less than 2.0% by mass with respect to the whole composition
  • R 1 represents a linear or branched alkylene group having 1 to 8 carbon atoms
  • R 2 and R 3 each represents a hydrocarbon group having 3 to 20 carbon atoms.
  • R 1 is a linear or branched alkylene group having 1 to 8 carbon atoms
  • R 2 and R 3 are each a linear or branched alkylene group having 3 to 20 carbon atoms.
  • a lubricating oil composition for a rotary compressor [4] The rotary compressor lubricating oil according to any one of [1] to [3], wherein the antioxidant is at least one selected from phenolic, phenylamine-based, and naphthylamine-based compounds.
  • the lubricating oil composition which can provide the outstanding extreme pressure property can be provided, maintaining high oxidation stability.
  • the lubricating oil composition for a rotary compressor in addition to achieving both excellent oxidation stability and extreme pressure properties, the lubricating oil composition for a rotary compressor that can further suppress the generation of sludge. Can be provided.
  • the lubricating oil for compressors contains an antioxidant from the viewpoint that high oxidation stability is required from the viewpoint of the usage pattern and usage cycle.
  • a lubricating oil for a compressor particularly a lubricating oil for a rotary compressor such as a gear drive system, is also required to have a sufficient extreme pressure, but an SP-based extreme pressure agent that has been conventionally used for a lubricating oil is a lubricating oil. As a result, the oxidation stability was significantly impaired.
  • the present inventors use a dithiophosphate ester compound having a specific structure having a COOH group in a specific amount in a lubricating oil for a rotary compressor, thereby improving its oxidation stability over a long period of time.
  • the present inventors have found that excellent extreme pressure properties can be imparted without damaging, and that sludge generation is suppressed to a level at which there is no practical problem.
  • Such a dithiophosphate compound having a COOH group was generally considered to inhibit oxidation stability, and the above findings were surprising.
  • the present invention has been completed from such a viewpoint.
  • Patent Document 1 is a problem related to engine oil used on the premise of short-term replacement as compared with compressor oil, so that the required performance for sludge suppression is low, and lubrication for compressor oil is required. It does not focus on long-term oxidative stability in oil, and of course, it does not relate to both oxidative stability and extreme pressure. Further, the technique disclosed in Patent Document 2 is directed to a problem relating to hydraulic fluid used on the premise of short-term replacement as compared with compressor oil, has low performance requirements for sludge suppression, and dithiophosphoric acid according to the present invention. It does not focus on the long-term oxidative stability and extreme pressure properties of compressor oils, particularly rotary compressor lubricating oils, due to the use of ester compounds, and the problems and configurations thereof do not disclose the present invention.
  • the lubricating oil composition for a rotary compressor of the present invention includes (a) a base oil, (b) an antioxidant, and (c) the entire composition. 0.05% by mass or more and less than 2.0% by mass of the dithiophosphate compound represented by the formula (I).
  • (A) Base oil As the base oil of the lubricating oil composition for a rotary compressor of the present invention, either mineral oil or synthetic oil can be used.
  • mineral oil include paraffin-based mineral oil, intermediate-based mineral oil, or naphthenic group obtained by usual refining methods such as solvent refining and hydrogenation refining.
  • mineral oils include mineral oils.
  • Synthetic oils include, for example, polybutenes, polyolefins ( ⁇ -olefin (co) polymers), various esters (eg, polyol esters, dibasic acid esters, phosphate esters, etc.), and various ethers (eg, polyesters). Phenyl ether, etc.), and slack wax and isomerized products of GTL WAX.
  • the viscosity of the base oil used in the lubricating oil composition of the present invention is arbitrary, but considering the lubricity, cooling properties, and friction loss during stirring, the kinematic viscosity at 40 ° C. is 1 mm 2 / s or more and 10,000 mm 2 / s. In the following, it is preferable to use one having a thickness of 5 mm 2 / s or more and 500 mm 2 / s or less, and more preferably 10 mm 2 / s or more and 100 mm 2 / s or less. Moreover, when using 2 or more types of base oil, the kinematic viscosity of the mixed base oil should just be in the said range.
  • mineral oil is preferably used as the base oil from the viewpoints of cost and supply stability.
  • antioxidant As an antioxidant for the component, any amine compound, phosphorus compound, sulfur compound, phosphorus / sulfur-containing compound, phenol compound, and the like that are commonly used in lubricating oils can be used. It is.
  • examples of amine compounds include monoalkyldiphenylamine compounds such as monooctyldiphenylamine and monononyldiphenylamine; 4,4′-dibutyldiphenylamine, 4,4′-dipentyldiphenylamine, 4,4′-dihexyldiphenylamine, 4,4 Dialkyldiphenylamine compounds such as' -diheptyldiphenylamine, 4,4'-dioctyldiphenylamine, 4,4'-dinonyldiphenylamine; polyalkyldiphenylamine compounds such as tetrabutyldiphenylamine, tetrahexyldiphenylamine, tetraoctyldiphenylamine, tetranonyldiphenylamine Phenyl amine compounds such as ⁇ -naphthylamine, phenyl- ⁇ -naphthylamine, butyl
  • Examples of phosphorus compounds, sulfur compounds, and phosphorus / sulfur-containing compounds include diethyl [[3,5-bis (1,1-dimethylethyl) -4-hydroxyphenyl] methyl] phosphonate, 3,5-ditert-butyl.
  • Phosphorus compounds such as diethyl-4-hydroxybenzylphosphonate, zinc dialkyldithiophosphates such as zinc di-2-ethylhexyldithiophosphate, 2,6-di-tert-butyl-4- (4,6-bis ( Octylthio) -1,3,5-triazin-2-ylamino) phenol, thioterpene compounds such as a reaction product of phosphorus pentasulfide and pinene, dialkylthiodipro such as dilauryl thiodipropionate, distearyl thiodipropionate Examples include pionate.
  • phenolic compounds examples include 2,6-di-tert-butyl-4-methylphenol, 2,6-di-tert-butyl-4-ethylphenol, 2,4,6-tri-tert-butylphenol, 2 , 6-Di-tert-butyl-4-hydroxymethylphenol, 2,6-di-tert-butylphenol, 2,4-dimethyl-6-tert-butylphenol, 2,6-di-tert-butyl-4- ( N, N-dimethylaminomethyl) phenol, 2,6-di-tert-amyl-4-methylphenol, n-octadecyl 3- (4-hydroxy-3,5-di-tert-butylphenyl) propionate, etc.
  • Cyclic phenols 4,4′-methylenebis (2,6-di-tert-butylphenol), 4,4′-isopropyl Redenbis (2,6-di-tert-butylphenol), 2,2'-methylenebis (4-methyl-6-tert-butylphenol), 4,4'-bis (2,6-di-tert-butylphenol), 4 , 4′-bis (2-methyl-6-tert-butylphenol), 2,2′-methylenebis (4-ethyl-6-tert-butylphenol), 4,4′-butylidenebis (3-methyl-6-tert- Butylphenol), 2,2′-thiobis (4-methyl-6-tert-butylphenol), polycyclic phenols such as 4,4′-thiobis (3-methyl-6-tert-butylphenol); and the like.
  • antioxidants from the viewpoint of antioxidant performance, phosphorus compounds, phenolic compounds, and amine compounds are preferable, phosphorus compounds, phenylamine compounds, and naphthylamine compounds are more preferable, specifically, Preferred are 4,4′-dioctyldiphenylamine, octylphenyl- ⁇ -naphthylamine, diethyl 3,5-ditert-butyl-4-hydroxybenzylphosphonate, and the like.
  • the content of the antioxidant is usually about 0.01% by mass or more and 10% by mass or less with respect to the entire lubricating oil composition, and the lower limit is preferably an antioxidant effect, and the upper limit is preferably from the viewpoint of solubility in base oil. Is 0.03% by mass or more and 5% by mass or less, more preferably 0.1% by mass or more and 4% by mass or less, and further preferably 0.5% by mass or more and 3% by mass or less.
  • R 1 represents a linear or branched alkylene group having 1 to 8 carbon atoms
  • R 2 and R 3 represents a hydrocarbon group having 3 to 20 carbon atoms.
  • R 1 when R 1 has a carbon number greater than 8, it tends to cause poor dissolution in the base oil. From the above viewpoint, R 1 must be a linear or branched alkylene group having 1 to 8 carbon atoms, preferably a linear or branched alkylene group having 2 to 4 carbon atoms. A branched alkylene group is more preferred. Specifically, —CH 2 CH 2 —, —CH 2 CH (CH 3 ) —, —CH 2 CH (CH 2 CH 3 ) —, —CH 2 CH (CH 2 CH 2 CH 3 ) — and the like are preferable. And —CH 2 CH (CH 3 ) — and —CH 2 CH (CH 3 ) CH 2 — are more preferred.
  • the carbon number of each of R 2 and R 3 is smaller than 3, the molecular weight is low, so that adsorption to the metal surface is likely to occur, and when it is larger than 20, poor solubility to the base oil is likely to occur.
  • the carbon number of each of R 2 and R 3 is preferably a linear or branched alkyl group having 3 to 8 carbon atoms, and more preferably a linear or branched alkyl group having 4 to 6 carbon atoms.
  • the dithiophosphate compound represented by the above formula (I) is contained in an amount of 0.05% by mass or more and less than 2.0% by mass with respect to the entire lubricating oil composition. If the content of the dithiophosphate compound is less than 0.05% by mass relative to the entire lubricating oil composition, the extreme pressure and oxidation stability are poor, and if it is 2.0% by mass or more, the oxidation stability is not sufficient. It is not preferable. From the above viewpoint, the dithiophosphate compound is preferably 0.07% by mass or more and less than 2.0% by mass, more preferably more than 0.1% by mass and less than 2.0% by mass, based on the entire lubricating oil composition. The content is preferably 0.2% by mass or more and 1.0% by mass or less, and particularly preferably 0.2% by mass or more and 0.5% by mass or less.
  • the lubricating oil composition for a rotary compressor of the present invention comprises 0.05% by mass or more and less than 2.0% by mass with respect to the (a) base oil, (b) antioxidant, and (c) the entire composition.
  • a dithiophosphate compound represented by the formula (I) a dithiophosphate compound represented by the formula (I)
  • At least one selected from an agent, an oily agent, a cleaning dispersant, a metal deactivator, a demulsifier, and the like can be blended.
  • extreme pressure agents examples include sulfur-based extreme pressure agents other than the dithiophosphate compound represented by the formula (I), phosphorus-based extreme pressure agents, dithiophosphate ester compounds having no COOH group, and monothiophosphate compounds.
  • An SP-type extreme pressure agent can be used.
  • the sulfur-based extreme pressure agent include dialkyl sulfide, dibenzyl sulfide, dialkyl sulfide, dibenzyl sulfide, alkyl mercaptan, dibenzothiophene, dibutyl dithioglycolate, and 2,2′-dithiobis (benzothiazole).
  • phosphate esters, phosphites, acidic phosphate esters, acidic phosphites or amine salts thereof are preferable, for example, trialkyl phosphate, triaryl phosphate, phosphonic acid.
  • Trialkyl, trialkyl phosphite, triaryl phosphite, dialkyl hydrogen phosphite and the like can be mentioned.
  • dithiophosphate compound having no COOH group a compound in which H of the COOH group is substituted with an alkyl group having 1 to 4 carbon atoms or the like in the dithiophosphate compound represented by the formula (I) in the present invention.
  • Examples of the monothiophosphate compound include trialkyl trithiophosphates, triaryl trithiophosphates, triaralkyl trithiophosphates, and the like. These extreme pressure agents can be used alone or in combination within a range that does not impair the effects of the present invention, and specifically, 0.2 parts by mass or less per 100 parts by mass of the lubricating oil composition. Can be used in quantity.
  • the antifoaming agent a silicone-based antifoaming agent is used, and a polymer silicone-based antifoaming agent is preferable. Is preferred.
  • the silicone antifoaming agent is preferably contained in an amount of about 0.0005% by mass or more and 0.5% by mass or less with respect to the entire lubricating oil composition from the viewpoint of a balance between the defoaming effect and economy.
  • rust preventive examples include metal sulfonates, aliphatic amines, organic phosphites, organic phosphates, organic sulfonates, organic phosphates, alkenyl succinates, polyhydric alcohol esters, and the like. Can be mentioned.
  • the content of these rust preventives is usually about 0.01% by mass or more and 10% by mass or less, preferably 0.05% by mass or more and 5% by mass or less, with respect to the entire lubricating oil composition, from the viewpoint of the blending effect. It is.
  • oily agent examples include aliphatic alcohols, fatty acid compounds such as fatty acids and fatty acid metal salts, ester compounds such as polyol esters, sorbitan esters, and glycerides, and amine compounds such as aliphatic amines.
  • the content of the oily agent is usually about 0.1% by mass or more and 30% by mass or less, preferably 0.5% by mass or more and 10% by mass or less with respect to the entire lubricating oil composition from the viewpoint of the blending effect. .
  • detergent dispersant examples include metal sulfonate, metal salicylate, metal phenate, aliphatic amines, organic phosphite, organic phosphate, organic sulfonate metal salt, organic phosphate metal salt, alkenyl succinate, Examples thereof include polyhydric alcohol esters.
  • the content of the detergent-dispersant is usually about 0.01% by mass to 30% by mass, preferably 0.05% by mass to 10% by mass with respect to the entire lubricating oil composition from the viewpoint of the blending effect. is there.
  • the metal deactivator examples include benzotriazoles and thiadiazoles.
  • the content of these metal deactivators is usually about 0.01% by mass or more and 10% by mass or less, preferably 0.01% by mass or more and 1% by mass with respect to the entire lubricating oil composition from the viewpoint of the blending effect. % Or less.
  • the pour point depressant polymethacrylate having a weight average molecular weight of about 50,000 to 150,000 can be used.
  • the content of the pour point depressant is usually 0.01% by mass or more and 5% by mass or less, preferably 0.02% by mass or more and 2% by mass with respect to the entire lubricating oil composition. % Or less.
  • the demulsifier conventionally known ones, for example, anionic surfactants such as sulfuric acid ester salt of castor oil and petroleum sulfonates, cationic surfactants such as quaternary ammonium salts and imidazoline type, ethylene oxide, propylene Oxide condensation products having a molecular weight of about 1500 to 10,000, specifically, polyoxyalkylene polyglycol and its dicarboxylic acid ester, and an alkylene oxide adduct of an alkylphenol-formaldehyde polycondensate.
  • the content of the demulsifier is usually 0.01% by mass or more and 5% by mass or less, preferably 0.02% by mass or more and 2% by mass or less, based on the entire lubricating oil composition.
  • the lubricating oil composition of the present invention has a kinematic viscosity at 100 ° C. (based on JIS K 2283) of preferably 7.5 mm 2 / s or less, more preferably 4. 5mm 2 / s more than 7.0mm is 2 / s or less. Further, the kinematic viscosity at 40 ° C. of the lubricating oil composition of the present invention is preferably 55 mm 2 / s or less, more preferably 30 mm 2 / s or more and 50 mm 2 / s from the viewpoint of improving energy saving by reducing friction. It is as follows.
  • the acid value (based on JIS K2501) is preferably 0 mgKOH / g or more and 1.0 mgKOH / g or less, and 0 mgKOH / g or more. More preferably, it is 0.5 mgKOH / g or less.
  • the present invention also provides a method of lubricating a rotary compressor using the lubricating oil composition described above.
  • a rotary compressor by filling the rotary compressor with the lubricating oil composition of the present invention as lubricating oil, excellent extreme pressure properties can be imparted while maintaining high oxidation stability. In addition to excellent oxidation stability and extreme pressure, the generation of sludge can be further suppressed.
  • the rotary compressor to which the lubricating oil composition of the present invention can be applied include any of a screw type, a movable blade type, a scroll type and a tooth type, and particularly, extreme pressure characteristics are required in the present invention. It is preferably applied to a rotary compressor using a gear drive system.
  • Load resistance test (shell EP test): In accordance with ASTM D2783, the test was carried out with a four-ball tester under the conditions of a rotation speed of 1,800 rpm and an oil temperature (18.3 to 35.0 ° C.). The load wear index (LWI) was determined from the maximum non-seizure load (LNL) and the fusion load (WL). The larger this value, the better the load resistance.
  • Wear resistance test (shell wear test): In accordance with ASTM D2783, a four-ball tester was used under the conditions of a load of 392 N, a rotation speed of 1,200 rpm, an oil temperature of 75 ° C., and a test time of 60 minutes. The average wear scar diameter was calculated by averaging the wear scar diameters of three 1/2 inch spheres.
  • Rotating cylinder oxidation stability test In accordance with JIS K2514, a container containing Cu coil as a catalyst in 5 g of sample oil and 5 ml of distilled water is placed in a rotating bomb, and oxygen is injected into the bomb up to 620 kPa. While maintaining the angle of the degree, it was rotated at 100 revolutions per minute, and the time (minutes) from when the oxygen pressure reached the maximum to 175 kPa was measured.
  • Oxidation stability test (Modified Indiana Oxidation Stability Test) Put 300ml of sample oil in a glass tube, insert a diffuser stone at the tip, and insert a 7.0mm outer diameter blowing tube with a Cu-Fe coil as a catalyst so that the Cu-Fe coil is immersed in the oil.
  • the oil temperature was set to 130 ° C., and oxygen was blown from this blowing tube at 3 L / hr for 240 to 960 hours, and the oxidation stability of the sample oil obtained by sampling in the meantime was examined.
  • FZG gear test In accordance with DIN 51354, a torsional load was applied to a pair of spur gears, and the extreme pressure property of the sample oil was evaluated while increasing the load until damage was recognized on the tooth surface. The amount of wear at each load stage of the pair of gears was measured, and the stage at which 10 mg or more was worn from the average slope of the wear curve was defined as the limit load.
  • the test conditions were as follows.
  • Millipore filter test In accordance with SAE-ARP-785-63, the precipitate generated in the sample oil sampled during the oxidation stability test (modified IOT) was collected by filtration and its weight was measured.
  • the used base oil and each additive are as follows. (Base oil) ⁇ Paraffin mineral oil 1 Kinematic viscosity: 30.6mm 2 /s(40°C),5.285mm 2 / s ( 100 °C), viscosity index: 104, acid value: 0.01 mg / g, a density: 0.863 (15 ° C.), flash Point: 222 ° C, pour point: -17.5 ° C ⁇ Paraffin mineral oil 2 Kinematic viscosity: 90.5mm 2 /s(40°C),10.89mm 2 / s ( 100 °C), viscosity index: 107, acid value: 0.01 mg / g, a density: 0.869 (15 ° C.), flash Point: 266 ° C, pour point: -17.5 ° C
  • Antioxidant 1 4,4′-dioctyldiphenylamine
  • Antioxidant 2 pt-octylphenyl-1-naphthylamine
  • Antioxidant 3 3,5-ditert-butyl-4-hydroxybenzylphosphonic acid Diethyl
  • Extreme pressure agent 1 terminal COOH-containing dithiophosphate represented by the following structure (compound in which R 1 in formula (I) is a propylene group, and R 2 and R 3 are each an isobutyl group)
  • R 4 and R 5 represent a hydrogen atom or an alkyl group.
  • Pour point depressant polymethacrylate (weight average molecular weight: 69000)
  • Cleaning dispersant Ca alkyl salicylate
  • Rust inhibitor Ca sulfonate
  • Metal deactivator Dialkylaminomethylbenzotriazole
  • Antifoaming agent Silicone defoaming agent
  • Each lubricating oil composition was subjected to an oxidation stability test (modified IOT), and the sample oil sampled between 0 and 960 hours was subjected to kinematic viscosity (40 ° C.), acid value, and rotary cylinder type oxidation stability test.
  • Tables 6 and 7 show the results of measuring (RPVOT) and Millipore filter values.
  • Comparative Example 7 contains ZnDTP as an extreme pressure agent, the results of the FZG gear test showing extreme pressure performance are good, but the acid number and Millipore filter value tend to increase rapidly. This shows that it is not suitable for long-term use. Moreover, since the comparative example 8 does not mix
  • the lubricating oil composition for rotary compressors of the present invention can impart excellent extreme pressure while maintaining high oxidation stability, the screw type, movable blade type, scroll type, tooth type, etc. It can be suitably used as a lubricating oil for a gear-driven rotary compressor.

Abstract

Provided is a lubricant oil composition for rotary compressor, containing (a) a base oil, (b) an antioxidant, and (c) a dithiophosphoric acid ester compound represented by general formula (I), in an amount of at least 0.05 mass% but less than 2.0 mass% of the entire composition, whereby the composition is imparted with outstanding extreme-pressure performance, while maintaining high stability against oxidation.

Description

回転式圧縮機用潤滑油組成物Lubricating oil composition for rotary compressor
　本発明は、回転式圧縮機用潤滑油組成物に関する。特に、本発明は、高い酸化安定性を維持しつつ優れた極圧性を付与することができる回転式圧縮機用潤滑油組成物に関する。 The present invention relates to a lubricating oil composition for a rotary compressor. In particular, the present invention relates to a lubricating oil composition for a rotary compressor capable of imparting excellent extreme pressure properties while maintaining high oxidation stability.
　従来、圧縮機油、タービン油、油圧作動油などの設備油分野、特にギヤ駆動方式等の圧縮機油においては、優れた酸化安定性と極圧性が求められているが、その両立は困難であった。すなわち、一般に酸化安定性に優れるとして従来使用されていた酸性リン酸エステルアミン塩や硫黄－リン系（ＳＰ系）極圧剤は、通常極圧性が十分でなく、一方、極圧性に優れているとされたジアルキルジチオリン酸亜鉛（ＺｎＤＴＰ）は油の酸化安定性を著しく阻害することが知られていた。
　極圧性を向上させる化合物に関しては、例えば、特許文献１には、エンジン油について耐摩耗性を改善すべく、２．０質量％以上８．０質量％以下の特定のジチオリン酸エステルを使用することが開示されている。また、特許文献２には、油圧作動油について、望ましくない加水分解生成物の生成を抑制すべく特定のモノチオリン酸エステルと特定のジチオリン酸エステルを組み合わせて使用することが開示されている。 Conventionally, in the field of equipment oil such as compressor oil, turbine oil, hydraulic hydraulic oil, particularly compressor oil of gear drive system or the like, excellent oxidation stability and extreme pressure properties have been demanded, but it has been difficult to achieve both. . That is, acidic phosphate ester salts and sulfur-phosphorus (SP) extreme pressure agents that have been conventionally used for their superior oxidation stability are usually not sufficient for extreme pressure, whereas they are excellent for extreme pressure. Zinc dialkyldithiophosphate (ZnDTP) was known to significantly inhibit the oxidative stability of oils.
Regarding compounds that improve extreme pressure, for example, Patent Document 1 uses a specific dithiophosphate of 2.0% by mass or more and 8.0% by mass or less in order to improve wear resistance of engine oil. Is disclosed. Patent Document 2 discloses that a specific monothiophosphate and a specific dithiophosphate are used in combination with a hydraulic fluid so as to suppress the formation of undesirable hydrolysis products.
国際公開ＷＯ０２／１０２９４５パンフレットInternational Publication WO02 / 102945 Pamphlet 特許公開第２００５－１３９４５１号公報Japanese Patent Publication No. 2005-139451
　しかしながら、前記特許文献１が開示する技術は、エンジン油に関する課題に対するものであり、圧縮機油用潤滑油、特に回転式圧縮機用潤滑油における酸化安定性と極圧性との両立に係るものではない。また、特許文献２が開示する技術は、油圧作動油に関する課題に対するものであり、圧縮機油、特に回転式圧縮機用潤滑油における酸化安定性と極圧性との両立に関するものではない。
　すなわち、本発明の課題は、回転式圧縮機用潤滑油において、高い酸化安定性を維持しつつ、優れた極圧性を付与しうる潤滑油組成物を提供することにある。
　また、本発明の課題は、上記回転式圧縮機用潤滑油組成物において、優れた酸化安定性と極圧性との両立に加え、更にスラッジの発生を抑制しうる回転式圧縮機用潤滑油組成物を提供することにある。 However, the technique disclosed in Patent Document 1 is directed to a problem related to engine oil, and does not relate to the compatibility between oxidation stability and extreme pressure in a lubricating oil for compressor oil, particularly a lubricating oil for rotary compressor. . Further, the technique disclosed in Patent Document 2 is directed to a problem related to hydraulic fluid, and is not related to compatibility between oxidation stability and extreme pressure in a compressor oil, particularly a lubricating oil for a rotary compressor.
That is, the subject of this invention is providing the lubricating oil composition which can provide the outstanding extreme pressure property, maintaining high oxidation stability in lubricating oil for rotary compressors.
Another object of the present invention is to provide a lubricating oil composition for a rotary compressor that can further suppress generation of sludge in addition to excellent oxidation stability and extreme pressure in the lubricating oil composition for a rotary compressor. To provide things.
　すなわち本発明は、
［１］（ａ）基油、（ｂ）酸化防止剤、及び（ｃ）組成物全体に対し０．０５質量％以上２．０質量％未満の下記式（Ｉ）で表されるジチオリン酸エステル化合物を含有する回転式圧縮機用潤滑油組成物、 That is, the present invention
[1] (a) Base oil, (b) Antioxidant, and (c) Dithiophosphate represented by the following formula (I) of 0.05% by mass or more and less than 2.0% by mass with respect to the whole composition A lubricating oil composition for a rotary compressor containing the compound,
Figure JPOXMLDOC01-appb-C000002
  
（式中、Ｒ１は炭素数１～８の直鎖又は分岐のアルキレン基を表し、Ｒ２及びＲ３はそれぞれ炭素数３～２０の炭化水素基を表す。）
［２］前記（ｃ）式（Ｉ）で表されるジチオリン酸エステル化合物を０．１質量％超２質量％未満含有する上記［１］記載の回転式圧縮機用潤滑油組成物、
［３］前記Ｒ１は炭素数１～８の直鎖又は分岐のアルキレン基であり、Ｒ２及びＲ３はそれぞれ炭素数３～２０の直鎖又は分岐のアルキレン基である上記［１］又は［２］に記載の回転式圧縮機用潤滑油組成物、
［４］前記酸化防止剤が、フェノール系、フェニルアミン系、及びナフチルアミン系の各化合物から選ばれる少なくとも一種である上記［１］～［３］のいずれかに記載の回転式圧縮機用潤滑油組成物、
Figure JPOXMLDOC01-appb-C000002
(Wherein R 1 represents a linear or branched alkylene group having 1 to 8 carbon atoms, and R 2 and R 3 each represents a hydrocarbon group having 3 to 20 carbon atoms.)
[2] The lubricating oil composition for a rotary compressor according to the above [1], which contains the dithiophosphate compound represented by the formula (I) in an amount of more than 0.1% and less than 2% by mass,
[3] The above R 1 is a linear or branched alkylene group having 1 to 8 carbon atoms, and R 2 and R 3 are each a linear or branched alkylene group having 3 to 20 carbon atoms. [2] a lubricating oil composition for a rotary compressor,
[4] The rotary compressor lubricating oil according to any one of [1] to [3], wherein the antioxidant is at least one selected from phenolic, phenylamine-based, and naphthylamine-based compounds. Composition,
［５］前記酸化防止剤を、組成物全体に対し０．０１質量％以上１０質量％以下含有する上記［１］～［４］のいずれかに記載の回転式圧縮機用潤滑油組成物、
［６］前記基油が鉱油である、前記［１］～［５］のいずれかに記載の潤滑油組成物、
［７］前記回転式圧縮機がギア駆動方式によるものである、前記［１］～［６］のいずれかに記載の回転式圧縮機用潤滑油組成物、及び
［８］前記回転式圧縮機が、スクリュー式、可動翼式、スクロール式又はツース式である、前記［１］～［７］のいずれかに記載の回転式圧縮機用潤滑油組成物、
に関する。 [5] The lubricating oil composition for a rotary compressor according to any one of the above [1] to [4], wherein the antioxidant is contained in an amount of 0.01% by mass to 10% by mass with respect to the entire composition.
[6] The lubricating oil composition according to any one of [1] to [5], wherein the base oil is mineral oil.
[7] The lubricating oil composition for a rotary compressor according to any one of [1] to [6], and [8] the rotary compressor, wherein the rotary compressor is of a gear drive system. Is a screw type, movable blade type, scroll type or tooth type, the lubricating oil composition for a rotary compressor according to any one of the above [1] to [7],
About.
　本発明によれば、回転式圧縮機用潤滑油において、高い酸化安定性を維持しつつ、優れた極圧性を付与しうる潤滑油組成物を提供することができる。
　また、本発明によれば、上記回転式圧縮機用潤滑油組成物において、優れた酸化安定性と極圧性の両立に加え、更にスラッジの発生を抑制しうる回転式圧縮機用潤滑油組成物を提供することができる。 ADVANTAGE OF THE INVENTION According to this invention, in the lubricating oil for rotary compressors, the lubricating oil composition which can provide the outstanding extreme pressure property can be provided, maintaining high oxidation stability.
In addition, according to the present invention, in the lubricating oil composition for a rotary compressor, in addition to achieving both excellent oxidation stability and extreme pressure properties, the lubricating oil composition for a rotary compressor that can further suppress the generation of sludge. Can be provided.
　以下、本発明をさらに詳細に説明する。
　通常、圧縮機用潤滑油は、その使用形態及び使用サイクルの観点から高い酸化安定性が要求される点から酸化防止剤を含有する。一方、圧縮機用潤滑油、特にギア駆動方式などの回転式圧縮機用潤滑油は十分な極圧性も要求されるが、従来、潤滑油に使用されてきたＳＰ系極圧剤は、潤滑油の長期使用により、その酸化安定性を著しく損なうものであった。 Hereinafter, the present invention will be described in more detail.
Usually, the lubricating oil for compressors contains an antioxidant from the viewpoint that high oxidation stability is required from the viewpoint of the usage pattern and usage cycle. On the other hand, a lubricating oil for a compressor, particularly a lubricating oil for a rotary compressor such as a gear drive system, is also required to have a sufficient extreme pressure, but an SP-based extreme pressure agent that has been conventionally used for a lubricating oil is a lubricating oil. As a result, the oxidation stability was significantly impaired.
　このような状況下において、本発明者らは、ＣＯＯＨ基を有する特定構造のジチオリン酸エステル化合物を特定量で回転式圧縮機用潤滑油に用いることにより、長期間に渡ってその酸化安定性を損なうことなく、優れた極圧性を付与することができ、しかもスラッジの発生も実用上問題のない水準に抑制されることを見出した。このようなＣＯＯＨ基を有するジチオリン酸エステル化合物は、一般に酸化安定性を阻害すると考えられていたものであり、上記知見は驚くべきものであった。本発明は、かかる見地から完成されたものである。
　なお、前記特許文献１が開示する技術は、圧縮機油に比べて短期交換を前提として使用されるエンジン油に関する課題に対するものであることから、スラッジ抑制に対する要求性能が低く、また、圧縮機油用潤滑油における長期間の酸化安定性に着目するものではなく、当然、酸化安定性と極圧性の両立に関するものではない。また、前記特許文献２が開示する技術は、圧縮機油に比べて短期交換を前提として使用される油圧作動油に関する課題に対するものであり、スラッジ抑制に対する要求性能が低く、また、本発明におけるジチオリン酸エステル化合物の使用による圧縮機油、特に回転式圧縮機用潤滑油における長期間の酸化安定性と極圧性の両立に着目したものではなく、その課題、構成は本発明を開示するものではない。 Under such circumstances, the present inventors use a dithiophosphate ester compound having a specific structure having a COOH group in a specific amount in a lubricating oil for a rotary compressor, thereby improving its oxidation stability over a long period of time. The present inventors have found that excellent extreme pressure properties can be imparted without damaging, and that sludge generation is suppressed to a level at which there is no practical problem. Such a dithiophosphate compound having a COOH group was generally considered to inhibit oxidation stability, and the above findings were surprising. The present invention has been completed from such a viewpoint.
The technique disclosed in Patent Document 1 is a problem related to engine oil used on the premise of short-term replacement as compared with compressor oil, so that the required performance for sludge suppression is low, and lubrication for compressor oil is required. It does not focus on long-term oxidative stability in oil, and of course, it does not relate to both oxidative stability and extreme pressure. Further, the technique disclosed in Patent Document 2 is directed to a problem relating to hydraulic fluid used on the premise of short-term replacement as compared with compressor oil, has low performance requirements for sludge suppression, and dithiophosphoric acid according to the present invention. It does not focus on the long-term oxidative stability and extreme pressure properties of compressor oils, particularly rotary compressor lubricating oils, due to the use of ester compounds, and the problems and configurations thereof do not disclose the present invention.
　本発明の回転式圧縮機用潤滑油組成物（以下、単に「潤滑油組成物」と称する場合がある）は、（ａ）基油、（ｂ）酸化防止剤、及び（ｃ）組成物全体に対し０．０５質量％以上２．０質量％未満の前記式（Ｉ）で表されるジチオリン酸エステル化合物を含有する。 The lubricating oil composition for a rotary compressor of the present invention (hereinafter sometimes simply referred to as “lubricating oil composition”) includes (a) a base oil, (b) an antioxidant, and (c) the entire composition. 0.05% by mass or more and less than 2.0% by mass of the dithiophosphate compound represented by the formula (I).
（（ａ）基油）
　本発明の回転式圧縮機用潤滑油組成物の基油としては、鉱油及び合成油のいずれも用いることができる。この鉱油や合成油の種類、その他については特に制限はなく、鉱油としては、例えば、溶剤精製、水添精製などの通常の精製法により得られたパラフィン基系鉱油、中間基系鉱油又はナフテン基系鉱油などがいずれも挙げられる。
　また、合成油としては、例えば、ポリブテン、ポリオレフィン〔α－オレフィン（共）重合体〕、各種のエステル（例えば、ポリオールエステル、二塩基酸エステル、リン酸エステルなど）、各種のエーテル（例えば、ポリフェニルエーテルなど）、さらにはスラックワックスやＧＴＬ　ＷＡＸの異性化物などが挙げられる。 ((A) Base oil)
As the base oil of the lubricating oil composition for a rotary compressor of the present invention, either mineral oil or synthetic oil can be used. There are no particular limitations on the type of mineral oil or synthetic oil, and the like. Examples of mineral oil include paraffin-based mineral oil, intermediate-based mineral oil, or naphthenic group obtained by usual refining methods such as solvent refining and hydrogenation refining. Examples include mineral oils.
Synthetic oils include, for example, polybutenes, polyolefins (α-olefin (co) polymers), various esters (eg, polyol esters, dibasic acid esters, phosphate esters, etc.), and various ethers (eg, polyesters). Phenyl ether, etc.), and slack wax and isomerized products of GTL WAX.
　これらの鉱油や合成油は単独で使用しても良く、またこれらの中から選ばれる２種以上の基油を任意の割合で混合して使用してもよい。
　本発明の潤滑油組成物で使用する基油の粘度は任意であるが、潤滑性、冷却性および攪拌時における摩擦損失を考慮すると、４０℃における動粘度が１ｍｍ２／ｓ以上１００００ｍｍ２／ｓ以下、好ましくは５ｍｍ２／ｓ以上５００ｍｍ２／ｓ以下、さらに好ましくは、１０ｍｍ２／ｓ以上１００ｍｍ２／ｓ以下のものを用いるのが望ましい。また、２種以上の基油を用いる場合は、その混合基油の動粘度が上記範囲内にあればよい。
　本発明においては、基油として、コスト及び供給安定性の観点から、鉱油を用いることが好ましい。 These mineral oils and synthetic oils may be used alone, or two or more kinds of base oils selected from these may be mixed and used in an arbitrary ratio.
The viscosity of the base oil used in the lubricating oil composition of the present invention is arbitrary, but considering the lubricity, cooling properties, and friction loss during stirring, the kinematic viscosity at 40 ° C. is 1 mm 2 / s or more and 10,000 mm 2 / s. In the following, it is preferable to use one having a thickness of 5 mm 2 / s or more and 500 mm 2 / s or less, and more preferably 10 mm 2 / s or more and 100 mm 2 / s or less. Moreover, when using 2 or more types of base oil, the kinematic viscosity of the mixed base oil should just be in the said range.
In the present invention, mineral oil is preferably used as the base oil from the viewpoints of cost and supply stability.
（（ｂ）酸化防止剤）
　（ｂ）成分の酸化防止剤としては、アミン系化合物、リン化合物、硫黄化合物およびリン・硫黄含有化合物やフェノール系化合物など、潤滑油に一般的に使用されているものであればいずれも使用可能である。
　例えば、アミン系化合物としては、モノオクチルジフェニルアミン、モノノニルジフェニルアミンなどのモノアルキルジフェニルアミン系化合物；４，４’－ジブチルジフェニルアミン、４，４’－ジペンチルジフェニルアミン、４，４’－ジヘキシルジフェニルアミン、４，４’－ジヘプチルジフェニルアミン、４，４’－ジオクチルジフェニルアミン、４，４’－ジノニルジフェニルアミンなどのジアルキルジフェニルアミン化合物；テトラブチルジフェニルアミン、テトラヘキシルジフェニルアミン、テトラオクチルジフェニルアミン、テトラノニルジフェニルアミンなどのポリアルキルジフェニルアミン系化合物等のフェニル系アミン系化合物；α－ナフチルアミン、フェニル－α－ナフチルアミン、ブチルフェニル－α－ナフチルアミン、ペンチルフェニル－α－ナフチルアミン、ヘキシルフェニル－α－ナフチルアミン、ヘプチルフェニル－α－ナフチルアミン、オクチルフェニル－α－ナフチルアミン、ノニルフェニル－α－ナフチルアミン、デシルフェニル－α－ナフチルアミン、ドデシルフェニル－α－ナフチルアミンなどのナフチルアミン系化合物が挙げられる。 ((B) Antioxidant)
(B) As an antioxidant for the component, any amine compound, phosphorus compound, sulfur compound, phosphorus / sulfur-containing compound, phenol compound, and the like that are commonly used in lubricating oils can be used. It is.
For example, examples of amine compounds include monoalkyldiphenylamine compounds such as monooctyldiphenylamine and monononyldiphenylamine; 4,4′-dibutyldiphenylamine, 4,4′-dipentyldiphenylamine, 4,4′-dihexyldiphenylamine, 4,4 Dialkyldiphenylamine compounds such as' -diheptyldiphenylamine, 4,4'-dioctyldiphenylamine, 4,4'-dinonyldiphenylamine; polyalkyldiphenylamine compounds such as tetrabutyldiphenylamine, tetrahexyldiphenylamine, tetraoctyldiphenylamine, tetranonyldiphenylamine Phenyl amine compounds such as α-naphthylamine, phenyl-α-naphthylamine, butylphenyl-α-naphthylamine, Naphtylamines such as tilphenyl-α-naphthylamine, hexylphenyl-α-naphthylamine, heptylphenyl-α-naphthylamine, octylphenyl-α-naphthylamine, nonylphenyl-α-naphthylamine, decylphenyl-α-naphthylamine, dodecylphenyl-α-naphthylamine System compounds.
　リン化合物、硫黄化合物およびリン・硫黄含有化合物としては、例えば、ジエチル［［３，５－ビス（１，１－ジメチルエチル）－４－ヒドロキシフェニル］メチル］ホスフォネート、３，５－ジｔｅｒｔ－ブチル－４－ヒドロキシベンジルホスホン酸ジエチルのようなリン化合物、ジ－２－エチルヘキシルジチオリン酸亜鉛のようなジアルキルジチオリン酸亜鉛類、２，６－ジ－ｔｅｒｔ－ブチル－４－（４，６－ビス（オクチルチオ）－１，３，５－トリアジン－２－イルアミノ）フェノール、五硫化リンとピネンとの反応物などのチオテルペン系化合物、ジラウリルチオジプロピオネート、ジステアリルチオジプロピオネートなどのジアルキルチオジプロピオネートなどが挙げられる。 Examples of phosphorus compounds, sulfur compounds, and phosphorus / sulfur-containing compounds include diethyl [[3,5-bis (1,1-dimethylethyl) -4-hydroxyphenyl] methyl] phosphonate, 3,5-ditert-butyl. Phosphorus compounds such as diethyl-4-hydroxybenzylphosphonate, zinc dialkyldithiophosphates such as zinc di-2-ethylhexyldithiophosphate, 2,6-di-tert-butyl-4- (4,6-bis ( Octylthio) -1,3,5-triazin-2-ylamino) phenol, thioterpene compounds such as a reaction product of phosphorus pentasulfide and pinene, dialkylthiodipro such as dilauryl thiodipropionate, distearyl thiodipropionate Examples include pionate.
　フェノール系化合物としては、例えば２，６－ジ－ｔｅｒｔ－ブチル－４－メチルフェノール、２，６－ジ－ｔｅｒｔ－ブチル－４－エチルフェノール、２，４，６－トリ－ｔｅｒｔ－ブチルフェノール、２，６－ジ－ｔｅｒｔ－ブチル－４－ヒドロキシメチルフェノール、２，６－ジ－ｔｅｒｔ－ブチルフェノール、２，４－ジメチル－６－ｔｅｒｔ－ブチルフェノール、２，６－ジ－ｔｅｒｔ－ブチル－４－（Ｎ，Ｎ－ジメチルアミノメチル）フェノール、２，６－ジ－ｔｅｒｔ－アミル－４－メチルフェノール、ｎ－オクタデシル３－（４－ヒドロキシ－３，５－ジ－ｔｅｒｔ－ブチルフェニル）プロピオネートなどの単環フェノール類；４，４’－メチレンビス（２，６－ジ－ｔｅｒｔ－ブチルフェノール）、４，４’－イソプロピリデンビス（２，６－ジ－ｔｅｒｔ－ブチルフェノール）、２，２’－メチレンビス（４－メチル－６－ｔｅｒｔ－ブチルフェノール）、４，４’－ビス（２，６－ジ－ｔｅｒｔ－ブチルフェノール）、４，４’－ビス（２－メチル－６－ｔｅｒｔ－ブチルフェノール）、２，２’－メチレンビス（４－エチル－６－ｔｅｒｔ－ブチルフェノール）、４，４’－ブチリデンビス（３－メチル－６－ｔｅｒｔ－ブチルフェノール）、２，２’－チオビス（４－メチル－６－ｔｅｒｔ－ブチルフェノール）、４，４’－チオビス（３－メチル－６－ｔｅｒｔ－ブチルフェノール）などの多環フェノール類；などが挙げられる。 Examples of phenolic compounds include 2,6-di-tert-butyl-4-methylphenol, 2,6-di-tert-butyl-4-ethylphenol, 2,4,6-tri-tert-butylphenol, 2 , 6-Di-tert-butyl-4-hydroxymethylphenol, 2,6-di-tert-butylphenol, 2,4-dimethyl-6-tert-butylphenol, 2,6-di-tert-butyl-4- ( N, N-dimethylaminomethyl) phenol, 2,6-di-tert-amyl-4-methylphenol, n-octadecyl 3- (4-hydroxy-3,5-di-tert-butylphenyl) propionate, etc. Cyclic phenols; 4,4′-methylenebis (2,6-di-tert-butylphenol), 4,4′-isopropyl Redenbis (2,6-di-tert-butylphenol), 2,2'-methylenebis (4-methyl-6-tert-butylphenol), 4,4'-bis (2,6-di-tert-butylphenol), 4 , 4′-bis (2-methyl-6-tert-butylphenol), 2,2′-methylenebis (4-ethyl-6-tert-butylphenol), 4,4′-butylidenebis (3-methyl-6-tert- Butylphenol), 2,2′-thiobis (4-methyl-6-tert-butylphenol), polycyclic phenols such as 4,4′-thiobis (3-methyl-6-tert-butylphenol); and the like.
　これらの酸化防止剤の中では、酸化防止性能の観点から、リン化合物、フェノール系化合物、アミン系化合物が好ましく、リン化合物、フェニルアミン系化合物、及びナフチルアミン系化合物がより好ましく、具体的には、４，４’－ジオクチルジフェニルアミン、オクチルフェニル－α－ナフチルアミン、３，５－ジｔｅｒｔ－ブチル－４－ヒドロキシベンジルホスホン酸ジエチルなどが好ましい。
　酸化防止剤の含有量は、潤滑油組成物全体に対し通常０．０１質量％以上１０質量％以下程度であり、下限値は酸化防止効果、上限値は基油に対する溶解性の観点から、好ましくは０．０３質量％以上５質量％以下であり、より好ましくは０．１質量％以上４質量％以下であり、更に好ましくは０．５質量％以上３質量％以下である。 Among these antioxidants, from the viewpoint of antioxidant performance, phosphorus compounds, phenolic compounds, and amine compounds are preferable, phosphorus compounds, phenylamine compounds, and naphthylamine compounds are more preferable, specifically, Preferred are 4,4′-dioctyldiphenylamine, octylphenyl-α-naphthylamine, diethyl 3,5-ditert-butyl-4-hydroxybenzylphosphonate, and the like.
The content of the antioxidant is usually about 0.01% by mass or more and 10% by mass or less with respect to the entire lubricating oil composition, and the lower limit is preferably an antioxidant effect, and the upper limit is preferably from the viewpoint of solubility in base oil. Is 0.03% by mass or more and 5% by mass or less, more preferably 0.1% by mass or more and 4% by mass or less, and further preferably 0.5% by mass or more and 3% by mass or less.
（（ｃ）式（Ｉ）で表されるジチオリン酸エステル化合物）
　本発明においては、下記式（Ｉ）で表されるジチオリン酸エステル化合物を用いるが、式（Ｉ）において、Ｒ１は炭素数１～８の直鎖又は分岐のアルキレン基を表し、Ｒ２及びＲ３はそれぞれ炭素数３～２０の炭化水素基を表す。 ((C) dithiophosphate compound represented by formula (I))
In the present invention, a dithiophosphate compound represented by the following formula (I) is used. In the formula (I), R 1 represents a linear or branched alkylene group having 1 to 8 carbon atoms, R 2 and R 3 represents a hydrocarbon group having 3 to 20 carbon atoms.
Figure JPOXMLDOC01-appb-C000003
  
Figure JPOXMLDOC01-appb-C000003
  
　式（Ｉ）において、Ｒ１の炭素数が８より大きい場合は基油に対して溶解不良を起こし易い。Ｒ１としては、上記観点から、炭素数１～８の直鎖又は分岐のアルキレン基であることが必要であり、炭素数２～４の直鎖又は分岐のアルキレン基であることが好ましく、分枝鎖アルキレン基であることがより好ましい。具体的には、－ＣＨ２ＣＨ２－、－ＣＨ２ＣＨ（ＣＨ３）－、－ＣＨ２ＣＨ（ＣＨ２ＣＨ３）－および－ＣＨ２ＣＨ（ＣＨ２ＣＨ２ＣＨ３）－等が好ましく挙げられ、－ＣＨ２ＣＨ（ＣＨ３）－、－ＣＨ２ＣＨ（ＣＨ３）ＣＨ２－がより好ましく挙げられる。 In the formula (I), when R 1 has a carbon number greater than 8, it tends to cause poor dissolution in the base oil. From the above viewpoint, R 1 must be a linear or branched alkylene group having 1 to 8 carbon atoms, preferably a linear or branched alkylene group having 2 to 4 carbon atoms. A branched alkylene group is more preferred. Specifically, —CH 2 CH 2 —, —CH 2 CH (CH 3 ) —, —CH 2 CH (CH 2 CH 3 ) —, —CH 2 CH (CH 2 CH 2 CH 3 ) — and the like are preferable. And —CH 2 CH (CH 3 ) — and —CH 2 CH (CH 3 ) CH 2 — are more preferred.
　また、Ｒ２及びＲ３の各々の炭素数が３より小さい場合は低分子量となるため金属表面への吸着不良を起こし易くなり、２０より大きい場合は基油に対して溶解不良を起こし易い。Ｒ２及びＲ３の各々の炭素数は上記観点から、３～８の直鎖又は分岐のアルキル基が好ましく、炭素数４～６の直鎖又は分岐のアルキル基がより好ましい。具体的には、プロピル、イソプロピル、ブチル、イソブチル、ｔ－ブチル、ペンチル、イソペンチル、ヘキシル、２－エチルブチル、１－メチルペンチル、１，３－ジメチルブチルおよび２－エチルヘキシルの各基からなる群より選ばれるように選択されることが好ましく、これらのうち、イソブチル、ｔ－ブチルが更に好ましい。 Further, when the carbon number of each of R 2 and R 3 is smaller than 3, the molecular weight is low, so that adsorption to the metal surface is likely to occur, and when it is larger than 20, poor solubility to the base oil is likely to occur. From the above viewpoint, the carbon number of each of R 2 and R 3 is preferably a linear or branched alkyl group having 3 to 8 carbon atoms, and more preferably a linear or branched alkyl group having 4 to 6 carbon atoms. Specifically, selected from the group consisting of propyl, isopropyl, butyl, isobutyl, t-butyl, pentyl, isopentyl, hexyl, 2-ethylbutyl, 1-methylpentyl, 1,3-dimethylbutyl and 2-ethylhexyl. Of these, isobutyl and t-butyl are more preferable.
　上記式（Ｉ）で表されるジチオリン酸エステル化合物は、潤滑油組成物全体に対し０．０５質量％以上２．０質量％未満含有される。上記ジチオリン酸エステル化合物の含有量が潤滑油組成物全体に対し０．０５質量％未満であれば極圧性及び酸化安定性に劣り、２．０質量％以上であれば酸化安定性が十分ではなく好ましくない。上記観点から、上記ジチオリン酸エステル化合物は潤滑油組成物全体に対し、好ましくは０．０７質量％以上２．０質量％未満、より好ましくは０．１質量％超２．０質量％未満、更に好ましくは０．２質量％以上１．０質量％以下含有され、特に好ましくは０．２質量％以上０．５質量％以下含有される。 The dithiophosphate compound represented by the above formula (I) is contained in an amount of 0.05% by mass or more and less than 2.0% by mass with respect to the entire lubricating oil composition. If the content of the dithiophosphate compound is less than 0.05% by mass relative to the entire lubricating oil composition, the extreme pressure and oxidation stability are poor, and if it is 2.0% by mass or more, the oxidation stability is not sufficient. It is not preferable. From the above viewpoint, the dithiophosphate compound is preferably 0.07% by mass or more and less than 2.0% by mass, more preferably more than 0.1% by mass and less than 2.0% by mass, based on the entire lubricating oil composition. The content is preferably 0.2% by mass or more and 1.0% by mass or less, and particularly preferably 0.2% by mass or more and 0.5% by mass or less.
（その他の潤滑油添加剤）
　本発明の回転式圧縮機用潤滑油組成物は、前記（ａ）基油、（ｂ）酸化防止剤、及び（ｃ）組成物全体に対し０．０５質量％以上２．０質量％未満の式（Ｉ）で表されるジチオリン酸エステル化合物を含有するが、更に、その他必要に応じて、潤滑油添加剤として、潤滑油に通常使用されるその他の極圧剤、消泡剤、防錆剤、油性剤、清浄分散剤、金属不活性化剤、抗乳化剤等から選ばれる少なくとも１種を配合することができる。 (Other lubricant additives)
The lubricating oil composition for a rotary compressor of the present invention comprises 0.05% by mass or more and less than 2.0% by mass with respect to the (a) base oil, (b) antioxidant, and (c) the entire composition. Contains a dithiophosphate compound represented by the formula (I), and, if necessary, as other lubricating oil additives, other extreme pressure agents, antifoaming agents, and rust prevention agents that are usually used in lubricating oils At least one selected from an agent, an oily agent, a cleaning dispersant, a metal deactivator, a demulsifier, and the like can be blended.
　その他の極圧剤としては、式（Ｉ）で表されるジチオリン酸エステル化合物以外の硫黄系極圧剤、リン系極圧剤、ＣＯＯＨ基を有しないジチオリン酸エステル化合物、モノチオリン酸エステル化合物等のＳＰ系極圧剤を用いることができる。
　硫黄系極圧剤としては、例えば硫化ジアルキル、硫化ジベンジル、多硫化ジアルキル、硫化ジベンジル、アルキルメルカプタン、ジベンゾチオフェン、ジチオグリコール酸ジブチルおよび２，２’－ジチオビス（ベンゾチアゾール）等が挙げられ、リン系極圧剤としては、リン酸エステル類、亜リン酸エステル類、酸性リン酸エステル類、酸性亜リン酸エステル類あるいはこれらのアミン塩が好ましく、例えばリン酸トリアルキル、リン酸トリアリール、ホスホン酸トリアルキル、亜リン酸トリアルキル、亜リン酸トリアリール、亜リン酸水素ジアルキル等が挙げられる。
　また、ＣＯＯＨ基を有しないジチオリン酸エステル化合物としては、本発明における式（Ｉ）で表されるジチオリン酸エステル化合物において、ＣＯＯＨ基のＨが炭素数１～４のアルキル基等で置換された化合物等が挙げられ、モノチオリン酸エステル化合物としては、例えばトリチオリン酸トリアルキル、トリチオリン酸トリアリール、トリチオリン酸トリアラルキル等が挙げられる。
　これらの極圧剤は、単独でもしくは組み合わせて、本発明の効果を阻害しない範囲において使用することができるが、具体的には、それぞれ潤滑油組成物１００質量部当り０．２質量部以下の量で使用することができる。 Examples of other extreme pressure agents include sulfur-based extreme pressure agents other than the dithiophosphate compound represented by the formula (I), phosphorus-based extreme pressure agents, dithiophosphate ester compounds having no COOH group, and monothiophosphate compounds. An SP-type extreme pressure agent can be used.
Examples of the sulfur-based extreme pressure agent include dialkyl sulfide, dibenzyl sulfide, dialkyl sulfide, dibenzyl sulfide, alkyl mercaptan, dibenzothiophene, dibutyl dithioglycolate, and 2,2′-dithiobis (benzothiazole). As extreme pressure agents, phosphate esters, phosphites, acidic phosphate esters, acidic phosphites or amine salts thereof are preferable, for example, trialkyl phosphate, triaryl phosphate, phosphonic acid. Trialkyl, trialkyl phosphite, triaryl phosphite, dialkyl hydrogen phosphite and the like can be mentioned.
Further, as the dithiophosphate compound having no COOH group, a compound in which H of the COOH group is substituted with an alkyl group having 1 to 4 carbon atoms or the like in the dithiophosphate compound represented by the formula (I) in the present invention. Examples of the monothiophosphate compound include trialkyl trithiophosphates, triaryl trithiophosphates, triaralkyl trithiophosphates, and the like.
These extreme pressure agents can be used alone or in combination within a range that does not impair the effects of the present invention, and specifically, 0.2 parts by mass or less per 100 parts by mass of the lubricating oil composition. Can be used in quantity.
　消泡剤としては、シリコーン系消泡剤が用いられ、高分子シリコーン系消泡剤が好ましく、例えばオルガノポリシロキサンを挙げることができ、特にトリフルオロプロピルメチルシリコーン油などの含フッ素オルガノポリシロキサンが好適である。シリコーン系消泡剤は消泡効果及び経済性のバランスの点から、潤滑油組成物全体に対し、０．０００５質量％以上０．５質量％以下程度含有させることが好ましい。 As the antifoaming agent, a silicone-based antifoaming agent is used, and a polymer silicone-based antifoaming agent is preferable. Is preferred. The silicone antifoaming agent is preferably contained in an amount of about 0.0005% by mass or more and 0.5% by mass or less with respect to the entire lubricating oil composition from the viewpoint of a balance between the defoaming effect and economy.
　防錆剤としては、例えば、金属スルホネート、脂肪族アミン類、有機亜リン酸エステル、有機リン酸エステル、有機スルフォン酸金属塩、有機リン酸金属塩、アルケニルコハク酸エステル、多価アルコールエステルなどが挙げられる。これら防錆剤の含有量は、配合効果の点から、潤滑油組成物全体に対し、通常０．０１質量％以上１０質量％以下程度であり、好ましくは０．０５質量％以上５質量％以下である。
　油性剤としては、脂肪族アルコール、脂肪酸や脂肪酸金属塩などの脂肪酸系化合物、ポリオールエステル、ソルビタンエステル、グリセライドなどのエステル化合物、脂肪族アミンなどのアミン化合物などを挙げることができる。油性剤の含有量は、配合効果の点から、潤滑油組成物全体に対し、通常０．１質量％以上３０質量％以下程度であり、好ましくは０．５質量％以上１０質量％以下である。 Examples of the rust preventive include metal sulfonates, aliphatic amines, organic phosphites, organic phosphates, organic sulfonates, organic phosphates, alkenyl succinates, polyhydric alcohol esters, and the like. Can be mentioned. The content of these rust preventives is usually about 0.01% by mass or more and 10% by mass or less, preferably 0.05% by mass or more and 5% by mass or less, with respect to the entire lubricating oil composition, from the viewpoint of the blending effect. It is.
Examples of the oily agent include aliphatic alcohols, fatty acid compounds such as fatty acids and fatty acid metal salts, ester compounds such as polyol esters, sorbitan esters, and glycerides, and amine compounds such as aliphatic amines. The content of the oily agent is usually about 0.1% by mass or more and 30% by mass or less, preferably 0.5% by mass or more and 10% by mass or less with respect to the entire lubricating oil composition from the viewpoint of the blending effect. .
　清浄分散剤としては、例えば、金属スルホネート、金属サリチレート、金属フェネート、脂肪族アミン類、有機亜リン酸エステル、有機リン酸エステル、有機スルフォン酸金属塩、有機リン酸金属塩、アルケニルコハク酸エステル、多価アルコールエステルなどが挙げられる。清浄分散剤の含有量は、配合効果の点から、潤滑油組成物全体に対し、通常０．０１質量％以上３０質量％以下程度であり、好ましくは０．０５質量％以上１０質量％以下である。 Examples of the detergent dispersant include metal sulfonate, metal salicylate, metal phenate, aliphatic amines, organic phosphite, organic phosphate, organic sulfonate metal salt, organic phosphate metal salt, alkenyl succinate, Examples thereof include polyhydric alcohol esters. The content of the detergent-dispersant is usually about 0.01% by mass to 30% by mass, preferably 0.05% by mass to 10% by mass with respect to the entire lubricating oil composition from the viewpoint of the blending effect. is there.
　金属不活性化剤としては、ベンゾトリアゾール類、チアジアゾール類などを挙げることができる。これら金属不活性化剤の含有量は、配合効果の点から、潤滑油組成物全体に対し、通常０．０１質量％以上１０質量％以下程度であり、好ましくは０．０１質量％以上１質量％以下である。
　流動点降下剤としては、重量平均分子量が５万以上１５万以下程度のポリメタクリレートなどを用いることができる。配合効果及び他の物性などの点から、流動点降下剤の含有量は、潤滑油組成物全体に対し、通常０．０１質量％以上５質量％以下、好ましくは０．０２質量％以上２質量％以下である。 Examples of the metal deactivator include benzotriazoles and thiadiazoles. The content of these metal deactivators is usually about 0.01% by mass or more and 10% by mass or less, preferably 0.01% by mass or more and 1% by mass with respect to the entire lubricating oil composition from the viewpoint of the blending effect. % Or less.
As the pour point depressant, polymethacrylate having a weight average molecular weight of about 50,000 to 150,000 can be used. In view of the blending effect and other physical properties, the content of the pour point depressant is usually 0.01% by mass or more and 5% by mass or less, preferably 0.02% by mass or more and 2% by mass with respect to the entire lubricating oil composition. % Or less.
　抗乳化剤としては、従来公知のもの、例えばひまし油の硫酸エステル塩や石油スルフォン酸塩などのアニオン性界面活性剤、第四級アンモニウム塩やイミダゾリン型などのカチオン性界面活性剤、さらにはエチレンオキシド、プロピレンオキシドの縮合生成物で分子量１５００以上１０，０００以下程度のもの、具体的にはポリオキシアルキレンポリグリコール及びそのジカルボン酸のエステル、アルキルフェノール－ホルムアルデヒド重縮合物のアルキレンオキシド付加物などが挙げられる。抗乳化剤の含有量は、潤滑油組成物全体に対し、通常０．０１質量％以上５質量％以下、好ましくは０．０２質量％以上２質量％以下である。 As the demulsifier, conventionally known ones, for example, anionic surfactants such as sulfuric acid ester salt of castor oil and petroleum sulfonates, cationic surfactants such as quaternary ammonium salts and imidazoline type, ethylene oxide, propylene Oxide condensation products having a molecular weight of about 1500 to 10,000, specifically, polyoxyalkylene polyglycol and its dicarboxylic acid ester, and an alkylene oxide adduct of an alkylphenol-formaldehyde polycondensate. The content of the demulsifier is usually 0.01% by mass or more and 5% by mass or less, preferably 0.02% by mass or more and 2% by mass or less, based on the entire lubricating oil composition.
　本発明の潤滑油組成物は、１００℃における動粘度（ＪＩＳ Ｋ ２２８３準拠）が、フリクション低減による省エネルギー性向上の観点から、好ましくは７．５ｍｍ２／ｓ以下であり、より好ましくは、４．５ｍｍ２／ｓ以上７．０ｍｍ２／ｓ以下である。
　また、本発明の潤滑油組成物の４０℃における動粘度は、フリクション低減による省エネルギー性向上の観点から、５５ｍｍ２／ｓ以下であることが好ましく、より好ましくは３０ｍｍ２／ｓ以上５０ｍｍ２／ｓ以下である。
　さらに、本発明の潤滑油組成物は、長期的な貯蔵安定性の観点から、酸価（ＪＩＳ Ｋ２５０１準拠）が、０ｍｇＫＯＨ／ｇ以上１．０ｍｇＫＯＨ／ｇ以下であることが好ましく、０ｍｇＫＯＨ／ｇ以上０．５ｍｇＫＯＨ／ｇ以下であることがより好ましい。 The lubricating oil composition of the present invention has a kinematic viscosity at 100 ° C. (based on JIS K 2283) of preferably 7.5 mm 2 / s or less, more preferably 4. 5mm 2 / s more than 7.0mm is 2 / s or less.
Further, the kinematic viscosity at 40 ° C. of the lubricating oil composition of the present invention is preferably 55 mm 2 / s or less, more preferably 30 mm 2 / s or more and 50 mm 2 / s from the viewpoint of improving energy saving by reducing friction. It is as follows.
Furthermore, in the lubricating oil composition of the present invention, from the viewpoint of long-term storage stability, the acid value (based on JIS K2501) is preferably 0 mgKOH / g or more and 1.0 mgKOH / g or less, and 0 mgKOH / g or more. More preferably, it is 0.5 mgKOH / g or less.
　本発明は、また、上述の潤滑油組成物を用いて、回転式圧縮機を潤滑する方法を提供するものである。
　すなわち、本発明の潤滑油組成物を回転式圧縮機に潤滑油として充填することで、高い酸化安定性を維持しつつ、優れた極圧性を付与し得る。また、優れた酸化安定性と極圧性の両立に加え、更にスラッジの発生を抑制し得る。
　本発明の潤滑油組成物を適用し得る回転式圧縮機としては、スクリュー式、可動翼式、スクロール式及びツース式のいずれも挙げることができ、特に、本発明においては、極圧性の求められるギア駆動方式による回転式圧縮機に適用することが好ましい。 The present invention also provides a method of lubricating a rotary compressor using the lubricating oil composition described above.
In other words, by filling the rotary compressor with the lubricating oil composition of the present invention as lubricating oil, excellent extreme pressure properties can be imparted while maintaining high oxidation stability. In addition to excellent oxidation stability and extreme pressure, the generation of sludge can be further suppressed.
Examples of the rotary compressor to which the lubricating oil composition of the present invention can be applied include any of a screw type, a movable blade type, a scroll type and a tooth type, and particularly, extreme pressure characteristics are required in the present invention. It is preferably applied to a rotary compressor using a gear drive system.
　次に、実施例により本発明を具体的に説明するが、本発明はこれらの例によって何ら制限されるものではない。
［潤滑油組成物の性状］
　潤滑油の各性状は以下の方法で測定した。
（１）動粘度（４０℃）：ＪＩＳ　Ｋ　２２８３準拠
（２）酸価（指示薬法）：ＪＩＳ　Ｋ　２５０１準拠
（３）銅板腐食（１００℃、３時間）：ＪＩＳ　Ｋ　２５１３準拠
（４）硫黄分（ｐｐｍ）：ＪＩＳ　Ｋ　２５４１準拠
（５）窒素分（ｐｐｍ）：ＪＩＳ　Ｋ　２６０９準拠
（６）リン含有量（ｐｐｍ）：ＩＣＰ分析
（７）亜鉛含有量（ｐｐｍ）：ＩＣＰ分析 EXAMPLES Next, although an Example demonstrates this invention concretely, this invention is not restrict | limited at all by these examples.
[Properties of lubricating oil composition]
Each property of the lubricating oil was measured by the following method.
(1) Kinematic viscosity (40 ° C): JIS K 2283 compliant (2) Acid value (indicator method): JIS K 2501 compliant (3) Copper plate corrosion (100 ° C, 3 hours): JIS K 2513 compliant (4) Sulfur content (Ppm): JIS K 2541 compliant (5) Nitrogen content (ppm): JIS K 2609 compliant (6) Phosphorus content (ppm): ICP analysis (7) Zinc content (ppm): ICP analysis
［評価項目・評価方法］
（１）耐荷重性試験（シェルＥＰ試験）：
　ＡＳＴＭ Ｄ２７８３に準拠して、四球試験機により回転数１，８００ｒｐｍ、油温（１８．３～３５．０℃）の条件で行った。最大非焼付荷重（ＬＮＬ）と融着荷重（ＷＬ）から荷重摩耗指数（ＬＷＩ）を求めた。この値が大きいほど耐荷重性が良好である。
（２）耐摩耗性試験（シェル摩耗試験）：
　ＡＳＴＭ Ｄ２７８３に準拠して、四球試験機により荷重３９２Ｎ、回転数１，２００ｒｐｍ、油温７５℃、試験時間６０分の条件で行った。１／２インチ球３個の摩耗痕径を平均して平均摩耗痕径を算出した。 [Evaluation items and methods]
(1) Load resistance test (shell EP test):
In accordance with ASTM D2783, the test was carried out with a four-ball tester under the conditions of a rotation speed of 1,800 rpm and an oil temperature (18.3 to 35.0 ° C.). The load wear index (LWI) was determined from the maximum non-seizure load (LNL) and the fusion load (WL). The larger this value, the better the load resistance.
(2) Wear resistance test (shell wear test):
In accordance with ASTM D2783, a four-ball tester was used under the conditions of a load of 392 N, a rotation speed of 1,200 rpm, an oil temperature of 75 ° C., and a test time of 60 minutes. The average wear scar diameter was calculated by averaging the wear scar diameters of three 1/2 inch spheres.
（３）回転ボンベ式酸化安定度試験（ＲＰＶＯＴ）
　ＪＩＳ　Ｋ２５１４に準拠して、試料油５ｇと蒸留水５ｍｌに触媒としてＣｕコイルを入れた容器を回転ボンベに入れ、ボンベに酸素を６２０ｋＰａまで圧入した後、１５０℃の恒温槽中で、ボンベを３０度の角度に保持しながら毎分１００回転で回転させ、酸素圧が最高になったときから１７５ｋＰａ低下するまでの時間（分）を測定した。　 (3) Rotating cylinder oxidation stability test (RPVOT)
In accordance with JIS K2514, a container containing Cu coil as a catalyst in 5 g of sample oil and 5 ml of distilled water is placed in a rotating bomb, and oxygen is injected into the bomb up to 620 kPa. While maintaining the angle of the degree, it was rotated at 100 revolutions per minute, and the time (minutes) from when the oxygen pressure reached the maximum to 175 kPa was measured.
（４）酸化安定度試験（修正ＩＯＴ：Modified Indiana Oxidation Stability Test）
　ガラス管に試料油３００ｍｌを入れ、これに、先端にディフューザーストーンを設け、触媒としてＣｕ－Ｆｅコイルを巻きつけた外径７．０ｍｍの吹きこみ管をＣｕ－Ｆｅコイルが油に浸かるように差し込み、油温を１３０℃とし、この吹きこみ管から、酸素を３Ｌ／ｈｒで２４０～９６０時間の間吹きこみ、この間で適時サンプリングして得られた試料油について酸化安定度を調べた。 (4) Oxidation stability test (Modified Indiana Oxidation Stability Test)
Put 300ml of sample oil in a glass tube, insert a diffuser stone at the tip, and insert a 7.0mm outer diameter blowing tube with a Cu-Fe coil as a catalyst so that the Cu-Fe coil is immersed in the oil. The oil temperature was set to 130 ° C., and oxygen was blown from this blowing tube at 3 L / hr for 240 to 960 hours, and the oxidation stability of the sample oil obtained by sampling in the meantime was examined.
（５）ＦＺＧ歯車試験
　ＤＩＮ　５１３５４に準拠して、一対の平歯車に捻じり荷重をかけ、歯面に損傷が認められるまで荷重を増加しながら試料油の極圧性を評価した。一対の歯車の各荷重段階での摩耗量を測定し、摩耗曲線の平均的傾斜から１０ｍｇ以上摩耗した段階を限界荷重とした。試験条件は以下の通りであった。 
・小歯車回転数：２２５０ｒｐｍ
・油温：運転開始時９０℃（以降９０℃以上）
・油量：歯車箱に１．２５ｌ
・試験歯車のピッチ円周速度：８．３０ｍ／ｓ
・荷重：荷重段階１～１２
・面圧：１５．７～１９８．９ｋｇ／ｍｍ２
・試験時間：各荷重段階で１５ｍｉｎ
・給油法：油浴給油 (5) FZG gear test In accordance with DIN 51354, a torsional load was applied to a pair of spur gears, and the extreme pressure property of the sample oil was evaluated while increasing the load until damage was recognized on the tooth surface. The amount of wear at each load stage of the pair of gears was measured, and the stage at which 10 mg or more was worn from the average slope of the wear curve was defined as the limit load. The test conditions were as follows.
・ Small gear rotation speed: 2250 rpm
-Oil temperature: 90 ° C at the start of operation (hereinafter 90 ° C or higher)
・ Amount of oil: 1.25 l in the gearbox
・ Pitch circumferential speed of test gear: 8.30 m / s
・ Load: Load stage 1-12
・ Surface pressure: 15.7-198.9 kg / mm 2
・ Test time: 15 min at each load stage
・ Lubrication method: Oil bath lubrication
（６）ミリポアフィルター試験
　ＳＡＥ－ＡＲＰ－７８５－６３に準拠して、前記酸化安定度試験（修正ＩＯＴ）の間サンプリングした試料油中に発生した析出物をろ過採取し、その重量を測定した。 (6) Millipore filter test In accordance with SAE-ARP-785-63, the precipitate generated in the sample oil sampled during the oxidation stability test (modified IOT) was collected by filtration and its weight was measured.
＜実施例１～５及び比較例１～６＞
　表１及び表２に示す基油を用意し、これに同表に示すように各種添加剤を配合して潤滑油組成物Ａ～Ｋを調製した後（表中の数字は質量％を示す）、得られた潤滑油組成物の各々について、前記の潤滑性能を評価した。その結果を表３及び表４に示す。なお、比較例５の潤滑油組成物Ｊとしては、極圧剤としてＺｎＤＴＰが０．５４質量％配合されている市販品（Roto Inject Fluid）を用いた。 <Examples 1 to 5 and Comparative Examples 1 to 6>
After preparing base oils shown in Table 1 and Table 2 and blending various additives as shown in the same table to prepare lubricating oil compositions A to K (the numbers in the table indicate mass%) The lubricating performance was evaluated for each of the obtained lubricating oil compositions. The results are shown in Tables 3 and 4. In addition, as the lubricating oil composition J of Comparative Example 5, a commercial product (Roto Inject Fluid) containing 0.54% by mass of ZnDTP as an extreme pressure agent was used.
Figure JPOXMLDOC01-appb-T000004
  
Figure JPOXMLDOC01-appb-T000004
  
Figure JPOXMLDOC01-appb-T000005
  
Figure JPOXMLDOC01-appb-T000005
  
Figure JPOXMLDOC01-appb-T000006
  
Figure JPOXMLDOC01-appb-T000006
  
Figure JPOXMLDOC01-appb-T000007
  
Figure JPOXMLDOC01-appb-T000007
  
　なお、使用した基油及び各添加剤は以下の通りである。
（基油）
・パラフィン系鉱油１
　動粘度：３０．６ｍｍ２／ｓ（４０℃）、５．２８５ｍｍ２／ｓ（１００℃）、粘度指数：１０４、酸価：０．０１ｍｇＫＯＨ／ｇ、密度：０．８６３（１５℃）、引火点：２２２℃、流動点：－１７．５℃
・パラフィン系鉱油２
　動粘度：９０．５ｍｍ２／ｓ（４０℃）、１０．８９ｍｍ２／ｓ（１００℃）、粘度指数：１０７、酸価：０．０１ｍｇＫＯＨ／ｇ、密度：０．８６９（１５℃）、引火点：２６６℃、流動点：－１７．５℃ In addition, the used base oil and each additive are as follows.
(Base oil)
・ Paraffin mineral oil 1
Kinematic viscosity: 30.6mm 2 /s(40℃),5.285mm 2 / s ( 100 ℃), viscosity index: 104, acid value: 0.01 mg / g, a density: 0.863 (15 ° C.), flash Point: 222 ° C, pour point: -17.5 ° C
・ Paraffin mineral oil 2
Kinematic viscosity: 90.5mm 2 /s(40℃),10.89mm 2 / s ( 100 ℃), viscosity index: 107, acid value: 0.01 mg / g, a density: 0.869 (15 ° C.), flash Point: 266 ° C, pour point: -17.5 ° C
（添加剤）
・酸化防止剤１：４，４’－ジオクチルジフェニルアミン
・酸化防止剤２：ｐ－ｔ－オクチルフェニル－１－ナフチルアミン
・酸化防止剤３：３，５－ジｔｅｒｔ－ブチル－４－ヒドロキシベンジルホスホン酸ジエチル (Additive)
Antioxidant 1: 4,4′-dioctyldiphenylamine Antioxidant 2: pt-octylphenyl-1-naphthylamine Antioxidant 3: 3,5-ditert-butyl-4-hydroxybenzylphosphonic acid Diethyl
・極圧剤１：下記構造で示される末端ＣＯＯＨ含有ジチオリン酸エステル（式（Ｉ）におけるＲ１がプロピレン基、Ｒ２及びＲ３はそれぞれイソブチル基である化合物） Extreme pressure agent 1: terminal COOH-containing dithiophosphate represented by the following structure (compound in which R 1 in formula (I) is a propylene group, and R 2 and R 3 are each an isobutyl group)
Figure JPOXMLDOC01-appb-C000008
  
・極圧剤２：下記構造で示されるトリフェニルチオリン酸エステル
Figure JPOXMLDOC01-appb-C000008
-Extreme pressure agent 2: Triphenylthiophosphate ester represented by the following structure
Figure JPOXMLDOC01-appb-C000009
  
・極圧剤３：下記構造で示されるトリス（２，４－Ｃ９－Ｃ１０イソアルキルフェニル）チオリン酸エステル
Figure JPOXMLDOC01-appb-C000009
Extreme pressure agent 3: Tris (2,4-C9-C10 isoalkylphenyl) thiophosphate ester represented by the following structure
Figure JPOXMLDOC01-appb-C000010
  
・極圧剤４：下記構造で示されるジチオグリコール酸ジブチル
Figure JPOXMLDOC01-appb-C000010
Extreme pressure agent 4: Dibutyl dithioglycolate represented by the following structure
Figure JPOXMLDOC01-appb-C000011
  
・極圧剤５：下記構造で示されるジチオリン酸エステル
Figure JPOXMLDOC01-appb-C000011
Extreme pressure agent 5: dithiophosphate ester represented by the following structure
Figure JPOXMLDOC01-appb-C000012
  
・極圧剤６：下記構造で示されるアルキルアシッドフォスフェートアミン塩
Figure JPOXMLDOC01-appb-C000012
Extreme pressure agent 6: alkyl acid phosphate amine salt represented by the following structure
Figure JPOXMLDOC01-appb-C000013
  
（上記式において、Ｒ４及びＲ５は水素原子又はアルキル基を表す。）
・流動点降下剤：ポリメタクリレート（重量平均分子量：６９０００）
・清浄分散剤：Ｃａアルキルサリチレート
・防錆剤：Ｃａスルホネート
・金属不活性化剤：ジアルキルアミノメチルベンゾトリアゾール
・消泡剤：シリコーン系消泡剤
Figure JPOXMLDOC01-appb-C000013
(In the above formula, R 4 and R 5 represent a hydrogen atom or an alkyl group.)
Pour point depressant: polymethacrylate (weight average molecular weight: 69000)
・ Cleaning dispersant: Ca alkyl salicylate ・ Rust inhibitor: Ca sulfonate ・ Metal deactivator: Dialkylaminomethylbenzotriazole ・ Antifoaming agent: Silicone defoaming agent
＜実施例６及び比較例７、８＞
　実施例５及び比較例５、６で得られた潤滑油組成物Ｅ、Ｊ及びＫの各々について、前記各組成、性状、回転ボンベ式酸化安定度試験（ＲＰＶＯＴ）及びＦＺＧ歯車試験を評価した結果を表５に示す。 <Example 6 and Comparative Examples 7 and 8>
Results of evaluating the respective compositions, properties, rotational cylinder type oxidation stability test (RPVOT) and FZG gear test for each of the lubricating oil compositions E, J and K obtained in Example 5 and Comparative Examples 5 and 6 Is shown in Table 5.
Figure JPOXMLDOC01-appb-T000014
  
Figure JPOXMLDOC01-appb-T000014
  
　また、各々の潤滑油組成物について酸化安定度試験（修正ＩＯＴ）を行い、０～９６０時間の間でサンプリングした試料油について、動粘度（４０℃）、酸価、回転ボンベ式酸化安定度試験（ＲＰＶＯＴ）、ミリポアアフィルター値を測定した結果を表６、表７に示す。 Each lubricating oil composition was subjected to an oxidation stability test (modified IOT), and the sample oil sampled between 0 and 960 hours was subjected to kinematic viscosity (40 ° C.), acid value, and rotary cylinder type oxidation stability test. Tables 6 and 7 show the results of measuring (RPVOT) and Millipore filter values.
Figure JPOXMLDOC01-appb-T000015
  
Figure JPOXMLDOC01-appb-T000015
  
Figure JPOXMLDOC01-appb-T000016
  
　表６および表７より、比較例７は極圧剤としてＺｎＤＴＰが配合されているから、極圧性能を示すＦＺＧ歯車試験の結果は良好であるが、酸価及びミリポアフィルター値が急激に上昇傾向を示しており、長期間の使用には適さないことがわかる。また、比較例８は極圧剤を配合していないから、極圧性能を示すＦＺＧ歯車試験の結果が悪く、圧縮機用潤滑油としての使用には適さないことがわかる。
　一方、実施例６は、比較例７、８との比較から、長期間にわたって高い酸化安定性を維持しつつ、また、スラッジの発生を実用上良好な程度に抑制し、優れた極圧性を付与し得ることがわかる。
Figure JPOXMLDOC01-appb-T000016
From Tables 6 and 7, since Comparative Example 7 contains ZnDTP as an extreme pressure agent, the results of the FZG gear test showing extreme pressure performance are good, but the acid number and Millipore filter value tend to increase rapidly. This shows that it is not suitable for long-term use. Moreover, since the comparative example 8 does not mix | blend an extreme pressure agent, the result of the FZG gear test which shows extreme pressure performance is bad, and it turns out that it is not suitable for the use as a lubricating oil for compressors.
On the other hand, in Example 6, compared with Comparative Examples 7 and 8, while maintaining high oxidation stability over a long period of time, the generation of sludge is suppressed to a practically favorable level, and excellent extreme pressure properties are imparted. You can see that
　本発明の回転式圧縮機用潤滑油組成物は、高い酸化安定性を維持しつつ、優れた極圧性を付与しうることから、スクリュー式、可動翼式、スクロール式、ツース式等の、特にギア駆動方式の回転式圧縮機用の潤滑油として好適に使用することができる。 Since the lubricating oil composition for rotary compressors of the present invention can impart excellent extreme pressure while maintaining high oxidation stability, the screw type, movable blade type, scroll type, tooth type, etc. It can be suitably used as a lubricating oil for a gear-driven rotary compressor.

Claims (8)

  1. 　（ａ）基油、（ｂ）酸化防止剤、及び（ｃ）組成物全体に対し０．０５質量％以上２．０質量％未満の下記式（Ｉ）で表されるジチオリン酸エステル化合物を含有する回転式圧縮機用潤滑油組成物。
    Figure JPOXMLDOC01-appb-C000001
      
    （式中、Ｒ１は炭素数１～８の直鎖又は分岐のアルキレン基を表し、Ｒ２及びＲ３はそれぞれ炭素数３～２０の炭化水素基を表す。）     (A) a base oil, (b) an antioxidant, and (c) 0.05% by mass or more and less than 2.0% by mass of the dithiophosphate compound represented by the following formula (I) with respect to the whole composition A lubricating oil composition for a rotary compressor.
    Figure JPOXMLDOC01-appb-C000001
    (Wherein R 1 represents a linear or branched alkylene group having 1 to 8 carbon atoms, and R 2 and R 3 each represents a hydrocarbon group having 3 to 20 carbon atoms.)
  2. 　前記（ｃ）式（Ｉ）で表されるジチオリン酸エステル化合物を０．１質量％超２質量％未満含有する請求項１記載の回転式圧縮機用潤滑油組成物。 The lubricating oil composition for a rotary compressor according to claim 1, wherein the (c) dithiophosphate compound represented by the formula (I) is contained more than 0.1% by mass and less than 2% by mass.
  3. 　前記Ｒ１が炭素数１～８の直鎖又は分岐のアルキレン基であり、前記Ｒ２及びＲ３がそれぞれ炭素数３～２０の直鎖又は分岐のアルキレン基である請求項１又は２に記載の回転式圧縮機用潤滑油組成物。 The R 1 is a linear or branched alkylene group having 1 to 8 carbon atoms, and the R 2 and R 3 are each a linear or branched alkylene group having 3 to 20 carbon atoms. Lubricating oil composition for rotary compressors.
  4. 　前記（ｂ）酸化防止剤が、リン化合物、フェノール系、フェニルアミン系、及びナフチルアミン系の各化合物から選ばれる少なくとも１種である請求項１～３のいずれかに記載の回転式圧縮機用潤滑油組成物。 The lubrication for a rotary compressor according to any one of claims 1 to 3, wherein (b) the antioxidant is at least one selected from phosphorus compounds, phenol-based compounds, phenylamine-based compounds, and naphthylamine-based compounds. Oil composition.
  5. 　前記酸化防止剤を潤滑油組成物全体に対し０．０１質量％以上１０質量％以下含有する請求項１～４のいずれかに記載の回転式圧縮機用潤滑油組成物。 The lubricating oil composition for a rotary compressor according to any one of claims 1 to 4, wherein the antioxidant is contained in an amount of 0.01% by mass or more and 10% by mass or less based on the entire lubricating oil composition.
  6. 　前記基油が鉱油である請求項１～５のいずれかに記載の回転式圧縮機用潤滑油組成物。 The lubricating oil composition for a rotary compressor according to any one of claims 1 to 5, wherein the base oil is a mineral oil.
  7. 　前記回転式圧縮機がギア駆動方式によるものである請求項１～６のいずれかに記載の回転式圧縮機用潤滑油組成物。 The lubricating oil composition for a rotary compressor according to any one of claims 1 to 6, wherein the rotary compressor is of a gear drive type.
  8. 　前記回転式圧縮機が、スクリュー式、可動翼式、スクロール式及びツース式のいずれかである請求項１～７のいずれかに記載の回転式圧縮機用潤滑油組成物。 The lubricating oil composition for a rotary compressor according to any one of claims 1 to 7, wherein the rotary compressor is any one of a screw type, a movable blade type, a scroll type, and a tooth type.
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