WO2011019028A1 - グリース組成物及び機械部品 - Google Patents
グリース組成物及び機械部品 Download PDFInfo
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- WO2011019028A1 WO2011019028A1 PCT/JP2010/063521 JP2010063521W WO2011019028A1 WO 2011019028 A1 WO2011019028 A1 WO 2011019028A1 JP 2010063521 W JP2010063521 W JP 2010063521W WO 2011019028 A1 WO2011019028 A1 WO 2011019028A1
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- carbon atoms
- grease composition
- salt
- group
- grease
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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
- C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
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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
- C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
- C10M169/06—Mixtures of thickeners and additives
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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
- C10M101/00—Lubricating compositions characterised by the base-material being a mineral or fatty oil
- C10M101/02—Petroleum fractions
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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
- C10M115/00—Lubricating compositions characterised by the thickener being a non-macromolecular organic compound other than a carboxylic acid or salt thereof
- C10M115/08—Lubricating compositions characterised by the thickener being a non-macromolecular organic compound other than a carboxylic acid or salt thereof containing nitrogen
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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
- C10M129/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen
- C10M129/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen having a carbon chain of less than 30 atoms
- C10M129/26—Carboxylic acids; Salts thereof
- C10M129/56—Acids of unknown or incompletely defined constitution
- C10M129/58—Naphthenic acids
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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
- 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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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
- C10M2205/02—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers
- C10M2205/028—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers containing aliphatic monomers having more than four carbon atoms
- C10M2205/0285—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers containing aliphatic monomers having more than four carbon atoms used as base material
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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
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/10—Carboxylix acids; Neutral salts thereof
- C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
- C10M2207/121—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of seven or less carbon atoms
- C10M2207/122—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of seven or less carbon atoms monocarboxylic
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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
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/10—Carboxylix acids; Neutral salts thereof
- C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
- C10M2207/125—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids
- C10M2207/126—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids monocarboxylic
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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
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/10—Carboxylix acids; Neutral salts thereof
- C10M2207/16—Naphthenic acids
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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
- C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant Compositions
- C10M2215/02—Amines, e.g. polyalkylene polyamines; Quaternary amines
- C10M2215/04—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to acyclic or cycloaliphatic carbon atoms
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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
- C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant Compositions
- C10M2215/10—Amides of carbonic or haloformic acids
- C10M2215/102—Ureas; Semicarbazides; Allophanates
- C10M2215/1026—Ureas; Semicarbazides; Allophanates used as thickening material
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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
- C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
- C10M2219/04—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions containing sulfur-to-oxygen bonds, i.e. sulfones, sulfoxides
- C10M2219/046—Overbased sulfonic acid salts
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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
- 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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- 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
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- 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
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2020/00—Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
- C10N2020/01—Physico-chemical properties
- C10N2020/02—Viscosity; Viscosity index
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
- C10N2030/02—Pour-point; Viscosity index
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- 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
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- 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
- C10N2040/02—Bearings
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- 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
- C10N2040/04—Oil-bath; Gear-boxes; Automatic transmissions; Traction drives
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- 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
- C10N2040/32—Wires, ropes or cables lubricants
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- 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
- C10N2050/00—Form in which the lubricant is applied to the material being lubricated
- C10N2050/10—Form in which the lubricant is applied to the material being lubricated semi-solid; greasy
Definitions
- the present invention relates to a grease composition and a machine part, and more particularly to a lubricating grease composition having excellent fretting resistance from room temperature to low temperature and a machine part such as a bearing in which the grease is sealed.
- Non-Patent Document 1 Countermeasures include: (1) reducing relative slip, (2) separation of both surfaces, prevention of direct contact, (3) contact surfaces such as phosphate coatings, or between surfaces by supplying lubricating oil / grease Prevention of adhesion of the like has been proposed (Non-Patent Document 1).
- aromatic diurea is inferior in fluidity.
- a deep groove ball bearing has a long life, but an angular ball bearing has a drawback that the lubrication life is short due to insufficient inflow into the lubrication part.
- the bearings that can be used are limited.
- the improvement by changing the thickener has a problem that the obtained grease lacks versatility.
- the consistency is made soft, a problem of leakage occurs and it cannot be used in a place where leakage is a problem. Therefore, this also lacks versatility as a grease.
- An object of the present invention is to provide a grease composition having excellent fretting resistance. Another object of the present invention is excellent in fretting resistance from room temperature to low temperature (eg, about ⁇ 50 ° C., preferably about ⁇ 40 ° C.) without relying on a base oil mainly composed of expensive synthetic oil. A grease composition is provided. Still another object of the present invention is to provide a machine part using the above grease composition.
- the present invention provides the following grease composition and machine part. 1.
- a grease composition containing a base oil, a thickener and an additive
- the base oil has a kinematic viscosity at 40 ° C. of 50 to 200 mm 2 / s
- the thickener contains a diurea compound represented by the following general formula (I): Formula (I): R 1 —NHCONH—R 2 —NHCONH—R 3
- R 2 is a divalent aromatic hydrocarbon group having 6 to 15 carbon atoms
- R 1 and R 3 are the same or different groups, and is a cyclohexyl group or a linear or branched alkyl group having 8 to 22 carbon atoms.
- the additive is at least one selected from the group consisting of a metal salt of naphthenic acid, a salt of a fatty acid having 6 to 10 carbon atoms and an aliphatic amine having 6 to 10 carbon atoms, and a metal salt of an organic sulfonic acid.
- Grease composition 2.
- the metal salt of naphthenic acid is at least one selected from the group consisting of zinc cyclopentanoate and zinc cyclohexane acid
- the amine salt is a linear fatty acid having 6 to 10 carbon atoms and a linear aliphatic group having 6 to 10 carbon atoms.
- a salt of an amine, and the organic sulfonate is at least one selected from the group consisting of dinonylnaphthalenesulfonate calcium salt, dinonylnaphthalenesulfonate zinc salt, and dinonylnaphthalenesulfonate barium salt.
- the content of the naphthenic acid metal salt is 0.5 to 5.0% by mass
- the content of the amine salt is 1.5 to 5.0% by mass
- the grease composition of the present invention has excellent fretting resistance. Therefore, the grease composition of the present invention can be used for lubricating various machine parts.
- the target mechanical parts are not particularly limited. For example, rolling bearings, ball screws, linear motion guide bearings, various gears, cams, constant velocity joints, journal bearings (sliding bearings), pistons, screws, ropes, chains, etc. Is mentioned. Particularly suitable for rolling bearings.
- the base oil used in the grease composition of the present invention is not particularly limited as long as it has a kinematic viscosity at 40 ° C. of 50 to 200 mm 2 / s. If the kinematic viscosity at 40 ° C. is less than 50 mm 2 / s, the oil film tends to be thin and a sufficient oil film thickness may not be ensured. If it exceeds 200 mm 2 / s, the viscosity resistance tends to increase. .
- Mineral oil is most preferred from the viewpoint of cost and performance. Mineral oil or synthetic oil can be mixed and used as necessary.
- Synthetic oils include, for example, ester-based synthetic oils typified by diesters and polyol esters, poly-alpha olefins, synthetic hydrocarbon oils typified by polybutene, alkyl-diphenyl ethers, ether-based synthetic oils typified by polypropylene glycol, and silicone oils.
- Various synthetic oils can be used, and these may be used alone or in admixture of two or more.
- the content of mineral oil in the base oil is preferably 70% by mass or more, more preferably 80 to 100% by mass, and most preferably 100% by mass.
- the thickener used in the grease composition of the present invention contains a specific diurea compound represented by the general formula (I).
- the content of the diurea compound in the grease composition of the present invention is such an amount that the consistency of the grease composition is preferably 235 to 325, more preferably 280 to 325. Specifically, it is preferably 5 to 15% by mass, more preferably 8 to 12% by mass, based on the entire grease composition. If the amount is less than 5% by mass, the grease softens when the shear is applied, and the grease easily leaks from the machine parts. If the amount is 15% by mass or more, the inflow property of the grease may be reduced. On the other hand, a grease using a metal soap such as lithium soap as a thickening agent cannot provide sufficient fretting resistance.
- the additive used in the grease composition of the present invention is selected from the group consisting of metal salts of naphthenic acid, salts of fatty acids having 6 to 10 carbon atoms and aliphatic amines having 6 to 10 carbon atoms, and metal salts of organic sulfonic acids. Contains at least one.
- the metal of the naphthenic acid metal salt include zinc, magnesium, calcium, and aluminum. Of these, zinc salts are particularly excellent.
- the fatty acid having 6 to 10 carbon atoms constituting the amine salt may be a linear or branched fatty acid.
- the aliphatic amine having 6 to 10 carbon atoms constituting the amine salt may be a linear or branched aliphatic amine.
- it is a salt of a linear fatty acid having 6 to 10 carbon atoms and a linear aliphatic amine having 6 to 10 carbon atoms, more preferably a salt of a linear fatty acid having 8 carbon atoms and a linear aliphatic amine having 8 carbon atoms.
- Examples of the organic sulfonic acid constituting the organic sulfonic acid metal salt include petroleum sulfonate, dinonylnaphthalene sulfonic acid, and heavy alkylbenzene sulfonic acid obtained by sulfonation of aromatic hydrocarbon components in the lubricating oil fraction. A sulfonic acid is mentioned.
- Examples of the metal of the organic sulfonic acid metal salt include calcium, zinc, barium, and sodium.
- the organic sulfonic acid calcium salt may be a neutral or highly basic salt. For example, a calcium salt having a base number of about 50 to 500 mgKOH / g is used.
- Preferred are metal salts of dinonylnaphthalenesulfonic acid, and particularly preferred are calcium, zinc and barium salts of dinonylnaphthalenesulfonic acid.
- the content of the naphthenic acid metal salt is preferably 0.5 to 5.0% by mass, particularly preferably 1.0 to 5.0% by mass.
- the content of the salt of a fatty acid having 6 to 10 carbon atoms and an aliphatic amine having 6 to 10 carbon atoms is preferably 1.5 to 5.0% by mass, particularly preferably 2.0 to 5.0% by mass.
- the content of the organic sulfonic acid metal salt is preferably 1.5 to 5.0% by mass, particularly preferably 2.0 to 5.0% by mass. What is necessary is just to adjust content suitably, when using 2 or more types together.
- Naphthenic acid metal salts, fatty acid amine salts, and organic sulfonates used as additives in the grease composition of the present invention are commonly used as rust inhibitors for lubricating oils and are used in a wide range of applications. It is used as an agent. However, there is no report / disclosure that the naphthenic acid metal salt, amine salt, and organic sulfonic acid metal salt are effective in preventing fretting that occurs from room temperature to low temperature.
- Phenols 2,6-di-tert-butyl-p-cresol, pentaerythrityl tetrakis [3- (3,5 -Di-t-butyl-4-hydroxyphenyl) propionate], hindered phenols such as octadecyl-3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate
- Quinoline series 2, 2, 4 -Trimethyl-1, 2-dihydroquinoline polymer, etc.
- -Antirust agent Carboxylic acid and its derivatives: alkenyl succinic anhydride, alkenyl succinic ester, alkenyl succinic acid half ester
- Carboxylate fatty acid, dibasic acid, lanolin fatty acid, alkenyl Metal salts such as succinic acid (C , Ba, Mg, Al, Zn, Na, etc.) or amine salts
- Passivating agent Na nitrite, Na moly
- Ester Sorbitan trioleate, sorbitan monooleate, etc.
- Metal corrosion inhibitor Benzotriazole or its derivatives, oxidation Zinc and other extreme pressure agents
- Phosphorus compounds tricresyl phosphate, tri-2-ethylhexyl phosphate, etc.
- Sulfur compounds dibenzyl disulfide, various polysulfides, etc.
- Sulfur-phosphorus compounds triphenyl phosphorothionate
- Organometallic electrode Pressure agent Zn, Mo, Sb, Bi, etc. of dialkyldithiophosphate, Zn, Mo, Sb, Ni, Cu, Bi, etc. of dialkyldithiocarbamate, etc. Others, ashless dithiocarbamate, ashless dithiophosphate carbamate, etc. ⁇ Solid lubricant: Mori disulfide Buden, graphite, PTFE, MCA, etc.
- Fretting prevention at room temperature can be dealt with by changing the type of thickener (the effect of (2) above by the aromatic urea film) and softening the consistency (improving the inflow of grease) (described later). Comparative Examples 6 to 10, Comparative Examples 19 and 20). However, the effect of preventing fretting by supplying grease cannot be expected due to a decrease in grease inflow at low temperatures.
- the grease composition of the present invention contains a specific additive (a metal salt of naphthenic acid, a salt of a fatty acid having 6 to 10 carbon atoms and an aliphatic amine having 6 to 10 carbon atoms, or a metal salt of an organic sulfonic acid).
- a specific additive a metal salt of naphthenic acid, a salt of a fatty acid having 6 to 10 carbon atoms and an aliphatic amine having 6 to 10 carbon atoms, or a metal salt of an organic sulfonic acid.
- the grease compositions of Comparative Examples 1, 9, and 10 that do not contain the specific additive of the present invention have a large amount of wear and poor fretting resistance at room temperature and low temperature, and also have poor rust prevention properties.
- the grease compositions of Comparative Examples 2, 4, 11, and 13 containing an additive different from the specific additive of the present invention have a small amount of wear at room temperature, but a large amount of wear at low temperatures and poor fretting resistance. In addition, the rust resistance is inferior.
- the grease compositions of Comparative Examples 3, 5, 6, 12, 14, and 15 containing an additive different from the specific additive of the present invention have a large amount of wear and poor fretting resistance at room temperature and low temperature, and Rust prevention is also poor.
- the grease compositions of Comparative Examples 7 and 16 using a base oil having a low kinematic viscosity have a little amount of wear at room temperature, but have a large amount of wear at low temperatures and inferior fretting resistance and inferior rust resistance. Yes.
- the grease compositions of Comparative Examples 8 and 17 in which the content of the thickener is reduced have a high miscibility and a little amount of wear at room temperature, but a large amount of wear at low temperatures and poor fretting resistance, and Rust prevention is also poor.
- the grease composition of Comparative Example 18 using lithium soap as a thickener is excellent in rust prevention, but has a large amount of wear and inferior fretting resistance at room temperature and low temperature.
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- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Lubricants (AREA)
Abstract
Description
この対策としては、(1)相対滑り量を低減する、(2)両面の分離、直接接触の防止、(3)リン酸塩被膜などの接触面の被覆又は潤滑油・グリースの供給による表面間の凝着の防止、等が提案されている(非特許文献1)。
このように現実的には、増ちょう剤の種類を変更したり、ちょう度を軟らかくしてグリースの流入を良くする等の対応がとられてきた。
また、ちょう度を軟らかくすると、漏えいの問題が生じ、漏れが問題となる個所へは使用できない。したがって、これもグリースとして汎用性に欠けるものとなる。
しかし、これらはいずれも常温下で発生するフレッチングに対する対策であり、低温下で発生するフレッチングを防止出来るという報告は殆どない。
本発明の他の目的は、高価な合成油を主体とした基油に頼ることなく、常温から低温下(例えば、-50℃、好ましくは-40℃程度)に至るまで、耐フレッチング性に優れたグリース組成物を提供することである。
本発明のさらに他の目的は、上記グリース組成物を使用した機械部品を提供することである。
1.基油、増ちょう剤及び添加剤を含有するグリース組成物において、
基油の40℃の動粘度が50~200mm2/sであり、
増ちょう剤が次の一般式(I)で表されるジウレア化合物を含有し、
一般式(I):R1-NHCONH-R2-NHCONH-R3
(式中、R2は炭素数6~15の2価の芳香族炭化水素基、R1およびR3は同一または異なる基であり、シクロヘキシル基、炭素数8~22の直鎖または分岐アルキル基を示す。)
添加剤が、ナフテン酸金属塩、炭素数6から10の脂肪酸と炭素数6から10の脂肪族アミンの塩、及び有機スルホン酸金属塩からなる群から選ばれる少なくとも1種であることを特徴とするグリース組成物。
2.前記ナフテン酸金属塩がシクロペンタン酸亜鉛及びシクロヘキサン酸亜鉛からなる群から選ばれる少なくとも1種であり、前記アミン塩が炭素数6から10の直鎖脂肪酸と炭素数6から10の直鎖脂肪族アミンの塩であり、前記有機スルホン酸塩がジノニルナフタレンスルホン酸カルシウム塩、ジノニルナフタレンスルホン酸亜鉛塩、及びジノニルナフタレンスルホン酸バリウム塩からなる群から選ばれる少なくとも1種であることを特徴とする上記1記載のグリース組成物。
3.グリース組成物中、前記ナフテン酸金属塩の含有量が、0.5から5.0質量%、前記アミン塩の含有量が、1.5から5.0質量%、前記有機スルホン酸金属塩の含有量が、1.5から5.0質量%であることを特徴とする上記1又は2記載のグリース組成物。
4.上記1~3のいずれか1項記載のグリース組成物を封入してなる機械部品。
コスト及び性能の観点から鉱油が最も好ましい。必要に応じて鉱油又は合成油を混合して使用することが可能である。
合成油としては、例えば、ジエステル、ポリオールエステルに代表されるエステル系合成油、ポリαオレフィン、ポリブテンに代表される合成炭化水素油、アルキルジフェニルエーテル、ポリプロピレングリコールに代表されるエーテル系合成油、シリコーン油など各種合成油が使用可能であり、これらは単独でも2種以上を混合して使用してもよい。
但し、コスト及び性能の観点から基油中の鉱油の含有量は、好ましくは70質量%以上、更に好ましくは80~100質量%、最も好ましくは100質量%である。
本発明のグリース組成物中のジウレア化合物の含有量は、グリース組成物のちょう度が好ましくは235~325、さらに好ましくは280~325となる程度の量である。具体的には、グリース組成物全体に対して、好ましくは5~15質量%、更に好ましくは8~12質量%である。
5質量%未満では、グリースにせん断が加わった際、軟化し、グリースが機械部品から漏洩し易く、15質量%以上ではグリースの流入性が低下してしまうことがある。
一方、リチウム石けんなどの金属石けんを増ちょう剤としたグリースでは、充分な耐フレッチング性を付与することは出来ない。
ナフテン酸金属塩の金属としては、亜鉛,マグネシウム,カルシウム,アルミニウムなどが挙げられる。中でも亜鉛塩が特に優れている。
前記アミン塩を構成する炭素数6から10の脂肪酸は、直鎖または分岐脂肪酸でよい。
また、前記アミン塩を構成する炭素数6から10の脂肪族アミンも、直鎖または分岐脂肪族アミンでよい。好ましくは炭素数6から10の直鎖脂肪酸と炭素数6から10の直鎖脂肪族アミンの塩、更に好ましくは炭素数8の直鎖脂肪酸と炭素数8の直鎖脂肪族アミンの塩である。
前記有機スルホン酸金属塩の金属としては、カルシウム,亜鉛,バリウム,ナトリウムなどが挙げられる。有機スルホン酸カルシウム塩は中性でも高塩基性塩でもよく、例えば、塩基価50~500mgKOH/g程度のカルシウム塩が用いられる。
好ましくは、ジノニルナフタレンスルホン酸の金属塩で、特に好ましくはジノニルナフタレンスルホン酸のカルシウム塩,亜鉛塩,バリウム塩である。
炭素数6から10の脂肪酸と炭素数6から10の脂肪族アミンの塩の含有量は、好ましくは1.5から5.0質量%、特に好ましくは2.0から5.0質量%である。
有機スルホン酸金属塩の含有量は、好ましくは1.5から5.0質量%、特に好ましくは2.0から5.0質量%である。
2種以上を併用する場合には、適宜含有量を調整すればよい。
含有量が上記未満では錆止め剤としての効果はあるが、常温から低温下で発生するフレッチング防止効果は不充分であり、5.0質量%以上添加してもそれ以上の添加効果は認められず不経済である。
しかし、上記ナフテン酸金属塩、アミン塩、有機スルホン酸金属塩が、常温から低温下で発生するフレッチング防止に効果を有する旨の報告・開示は全くない。
・酸化防止剤
アミン類:フェニルαナフチルアミン、アルキル化フェニルαナフチルアミン、アルキル化ジフェニルアミンなど
フェノール類:2、6-ジ-tert-ブチル-p-クレゾール、ペンタエリスリチル・テトラキス[3-(3、5-ジ-t-ブチル-4-ヒドロキシフェニル)プロピオネート]、オクタデシル-3-(3、5-ジ-t-ブチル-4-ヒドロキシフェニル)プロピオネートなどのヒンダードフェノールなど
キノリン系:2、2、4-トリメチル-1、2ジヒドロキノリン重合体など
・錆止め剤
カルボン酸およびその誘導体:アルケニルコハク酸無水物、アルケニルコハク酸エステル、アルケニルコハク酸ハーフエステル
カルボン酸塩:脂肪酸、二塩基酸、ラノリン脂肪酸、アルケニルコハク酸などの金属塩(Ca、Ba、Mg、Al、Zn、Naなど)又はアミン塩
不働態化剤:亜硝酸Na、モリブデン酸Naなど
エステル:ソルビタントリオレート、ソルビタンモノオレートなど
金属腐食防止剤:ベンゾトリアゾール又はその誘導体、酸化亜鉛など
・極圧剤
リン系化合物:トリクレジルホスフェート、トリ-2-エチルヘキシルホスフェートなど
硫黄系化合物:ジベンジルジサルファイド、各種ポリサルファイドなど
硫黄-リン系化合物:トリフェニルホスホロチオネート
有機金属系極圧剤:ジアルキルジチオリン酸のZn、Mo、Sb、Biなどの塩、ジアルキルジチオカルバミン酸のZn、Mo、Sb、Ni、Cu、Biなどの塩など
その他、無灰ジチオカーバメート、無灰ジチオホスフェートカーバメートなど
・固体潤滑剤:二硫化モリブデン、グラファイト、PTFE、MCAなど。
しかし、低温下ではグリース流入性の低下により、グリースの供給によるフレッチング防止効果が期待できない。
このため、これを例えば、軸受に使用した場合、この添加剤の部材表面に対する強い吸着力により、ジウレアグリースとボール及び内外輪レースとの界面で接着作用を発揮し、グリース流入性の低下する環境下においても、両面を充分に分離し、直接接触を防止することにより、低温下のフレッチングを防止できるものと考えられる。
特定の添加剤の添加により常温から低温下の耐フレッチング性を改善できるという本発明の効果は、当業者が容易に予測できるものではない。
基油中で原料イソシアネート1モルに対し原料アミン2モルの比率で所定量を反応させ、添加剤を所定量加え、3本ロールミルで規定のちょう度になるように調整した。
所定量の基油中で所定量のヒドロキシステアリン酸リチウムを混合加熱溶解し、冷却した後、添加剤を所定量加え、3本ロールミルで規定のちょう度になるように調整した。
・混和ちょう度:JIS K 2220.7
・Fafnir friction oxidation test(ADTM D 4170準拠)
・耐フレッチング性を評価する規格試験
下記試験スラスト軸受2組に試験グリースを塗布し、規定の揺動運転を行い、摩耗量(フレッチング摩耗による重量減)を求める。
[試験条件]
軸受 :ANDREWS W 5/8
荷重 :2450N(550lbf)(面圧:1861MPa)
揺動角 :0.21rad(12°)
揺動サイクル :25Hz
時間 :22h
温度 :25℃,-30℃
グリース封入量:軸受1組当たり1.0g
摩耗量 :軸受1組当たりのレース質量減(試験軸受レースの総質量減/2)
[判定]
◎:摩耗量2.0mg以下(耐フレッチング性:非常に大きい)
○:摩耗量2.0超5.0mg未満(耐フレッチング性:大きい)
△:摩耗量5.0超15.0mg未満(耐フレッチング性:少しあり)
×:摩耗量15.0mg以上(耐フレッチング性:なし)
防錆試験:ASTM D1743-73 軸受防錆試験
[判定]
○:錆なし
×:錆あり
結果を表1~5に示す。
※2;シクロペンタン酸亜鉛を主成分とするナフテン酸金属塩
※3;炭素数8の直鎖脂肪酸と炭素数8の直鎖脂肪族アミンの塩
※4;ジノニルナフタレンスルホン酸カルシウム
※5;ジノニルナフタレンスルホン酸亜鉛
※6;ジノニルナフタレンスルホン酸バリウム
※7;アルキルホスホロチオネート化合物とアミン系化合物の混合物 商品名HITEC833(アフトンケミカル社製)
※8;炭酸カルシウム
※9;ステアリン酸亜鉛
※10;商品名MOLYVAN A(R.T.VANDERBILT社製)
※11;商品名LUBRIZOL 1395(日本ルーブリゾール社製)
ODA:オクタデシルアミン
CHA:シクロヘキシルアミン
OA:オクチルアミン
PAO:ポリ-α-オレフィン
尚、表中※2~※6,※8,※9の( )内グリース全量中の添加量:質量%は、添加剤の有効成分濃度を表す。
また、表中※7,※10,※11の( )内グリース全量中の添加量:質量%は、商品の添加濃度を表す。
本発明の特定の添加剤を含まない比較例1、9及び10のグリース組成物は、常温及び低温下において、摩耗量が多く耐フレッチング性に劣り、かつ防錆性も劣っている。
本発明の特定の添加剤とは異なる添加剤を含む比較例2、4、11及び13のグリース組成物は、常温において、摩耗量が少ないが、低温下において摩耗量が多く耐フレッチング性に劣り、かつ防錆性も劣っている。
本発明の特定の添加剤とは異なる添加剤を含む比較例3、5、6、12、14、15のグリース組成物は、常温及び低温下において、摩耗量が多く耐フレッチング性に劣り、かつ防錆性も劣っている。
動粘度が低い基油を使用した比較例7及び16のグリース組成物は、常温において、摩耗量がやや少ないが、低温下において摩耗量が多く耐フレッチング性に劣り、かつ防錆性も劣っている。
増ちょう剤の含有量を少なくした比較例8及び17のグリース組成物は、混和ちょう度が高く、常温において、摩耗量がやや少ないが、低温下において摩耗量が多く耐フレッチング性に劣り、かつ防錆性も劣っている。
増ちょう剤としてリチウム石けんを使用した比較例18のグリース組成物は、防錆性は優れているが、常温及び低温下において、摩耗量が多く耐フレッチング性に劣っている。
Claims (4)
- 基油、増ちょう剤及び添加剤を含有するグリース組成物において、
基油の40℃の動粘度が50~200mm2/sであり、
増ちょう剤が次の一般式(I)で表されるジウレア化合物を含有し、
一般式(I):R1-NHCONH-R2-NHCONH-R3
(式中、R2は炭素数6~15の2価の芳香族炭化水素基、R1およびR3は同一または異なる基であり、シクロヘキシル基、炭素数8~22の直鎖または分岐アルキル基を示す。)
添加剤が、ナフテン酸金属塩、炭素数6から10の脂肪酸と炭素数6から10の脂肪族アミンの塩、及び有機スルホン酸金属塩からなる群から選ばれる少なくとも1種であることを特徴とするグリース組成物。 - 前記ナフテン酸金属塩がシクロペンタン酸亜鉛及びシクロヘキサン酸亜鉛からなる群から選ばれる少なくとも1種であり、前記アミン塩が炭素数6から10の直鎖脂肪酸と炭素数6から10の直鎖脂肪族アミンの塩であり、前記有機スルホン酸塩がジノニルナフタレンスルホン酸カルシウム塩、ジノニルナフタレンスルホン酸亜鉛塩、及びジノニルナフタレンスルホン酸バリウム塩からなる群から選ばれる少なくとも1種であることを特徴とする請求項1記載のグリース組成物。
- グリース組成物中、前記ナフテン酸金属塩の含有量が、0.5から5.0質量%、前記アミン塩の含有量が、1.5から5.0質量%、前記有機スルホン酸金属塩の含有量が、1.5から5.0質量%であることを特徴とする請求項1又は2記載のグリース組成物。
- 請求項1~3のいずれか1項記載のグリース組成物を封入してなる機械部品。
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| FR2999670B1 (fr) * | 2012-12-13 | 2014-11-28 | Hydromecanique & Frottement | Organe de guidage sous forme d'une bague metallique pour le montage avec frottement et avec capacite d''articulation et/ou de coulissement d'un axe. |
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| JP2004224823A (ja) * | 2003-01-20 | 2004-08-12 | Nsk Ltd | グリース組成物及び転動装置 |
| EP1847586B1 (en) * | 2005-01-24 | 2013-04-03 | Nsk Ltd. | Grease composition for hub unit bearing, and hub unit bearing for vehicles |
| JP5096703B2 (ja) * | 2006-07-04 | 2012-12-12 | 日本精工株式会社 | 耐水性グリース組成物及び車両用ハブユニット軸受 |
-
2009
- 2009-08-10 JP JP2009185793A patent/JP2011037975A/ja active Pending
-
2010
- 2010-08-10 US US13/389,711 patent/US20120142566A1/en not_active Abandoned
- 2010-08-10 EP EP10808211A patent/EP2465916A4/en not_active Withdrawn
- 2010-08-10 WO PCT/JP2010/063521 patent/WO2011019028A1/ja not_active Ceased
- 2010-08-10 CN CN2010800348683A patent/CN102471718A/zh active Pending
- 2010-08-10 KR KR1020117028102A patent/KR20120042743A/ko not_active Ceased
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| JPH09324190A (ja) * | 1996-06-07 | 1997-12-16 | Kyodo Yushi Kk | 等速ジョイント用グリース組成物 |
| JPH11172276A (ja) * | 1997-12-10 | 1999-06-29 | Kyodo Yushi Co Ltd | 等速ジョイント用グリース組成物 |
| JP2001234935A (ja) * | 2000-02-22 | 2001-08-31 | Nsk Ltd | 転がり軸受 |
| JP2004051912A (ja) * | 2002-07-24 | 2004-02-19 | Ntn Corp | 防錆グリースおよび該グリース封入軸受 |
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| T. ENDO, EUROGREASE, November 1997 (1997-11-01), pages 25 - 40 |
| YUJI YAMAMOTO ET AL.: "Tribology", 25 November 1999, RIKOGAKUSHA PUBLISHING CO., LTD., pages: 201 - 203 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021251250A1 (ja) | 2020-06-09 | 2021-12-16 | Nokクリューバー株式会社 | 潤滑剤組成物 |
| US12264291B2 (en) | 2020-06-09 | 2025-04-01 | Nok Klueber Co., Ltd. | Lubricant composition |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20120042743A (ko) | 2012-05-03 |
| EP2465916A4 (en) | 2013-03-06 |
| CN102471718A (zh) | 2012-05-23 |
| US20120142566A1 (en) | 2012-06-07 |
| JP2011037975A (ja) | 2011-02-24 |
| EP2465916A1 (en) | 2012-06-20 |
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