Classifications

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  • 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
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  • 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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  • 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
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  • 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
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  • 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
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  • 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
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  • 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
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  • 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
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  • 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
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  • 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
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  • 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
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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
  • 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.

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• 2012
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