EP3269794B1 - Composition de graisse lubrifiante - Google Patents

Composition de graisse lubrifiante Download PDF

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Publication number
EP3269794B1
EP3269794B1 EP16761774.5A EP16761774A EP3269794B1 EP 3269794 B1 EP3269794 B1 EP 3269794B1 EP 16761774 A EP16761774 A EP 16761774A EP 3269794 B1 EP3269794 B1 EP 3269794B1
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EP
European Patent Office
Prior art keywords
grease composition
thickener
hydroxycarboxylic acid
metal salt
base oil
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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EP16761774.5A
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German (de)
English (en)
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EP3269794A1 (fr
EP3269794A4 (fr
Inventor
Kazumi Sakai
Hisayuki Wada
Yusuke AYAME
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Eneos Corp
Original Assignee
JXTG Nippon Oil and Energy Corp
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Classifications

    • 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
    • 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
    • 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
    • C10M129/28—Carboxylic acids; Salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
    • C10M129/38—Carboxylic acids; Salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having 8 or more carbon atoms
    • C10M129/44—Carboxylic acids; Salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having 8 or more carbon atoms containing hydroxy groups
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M133/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing nitrogen
    • C10M133/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing nitrogen having a carbon chain of less than 30 atoms
    • C10M133/16—Amides; Imides
    • 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
    • C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
    • C10M2201/06—Metal compounds
    • C10M2201/061—Carbides; Hydrides; Nitrides
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
    • C10M2205/02—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers
    • C10M2205/028—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers containing aliphatic monomers having more than four carbon atoms
    • C10M2205/0285—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers containing aliphatic monomers having more than four carbon atoms used as base material
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • 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
    • C10M2207/1206—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms used as thickening agents
    • 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
    • C10M2207/123—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of seven or less carbon atoms polycarboxylic
    • C10M2207/1236—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of seven or less carbon atoms polycarboxylic used as thickening agent
    • 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
    • C10M2207/128—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 containing hydroxy groups; Ethers 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
    • 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
    • C10M2207/128—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 containing hydroxy groups; Ethers thereof
    • C10M2207/1285—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 containing hydroxy groups; Ethers thereof used as thickening agents
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/28—Esters
    • C10M2207/283—Esters of polyhydroxy compounds
    • C10M2207/2835—Esters of polyhydroxy compounds 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
    • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2215/08—Amides
    • 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
    • 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
    • C10M2215/221—Six-membered rings containing nitrogen and carbon only
    • 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
    • C10N2030/06—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
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/02—Bearings
    • 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—Semi-solids; greasy

Definitions

  • the present invention relates to a grease composition capable of reducing an amount of wear in sliding parts.
  • Grease has been mainly used for slide bearings and rolling bearings (bearings), or for sliding surfaces where a lubricant film cannot easily remain attached because of moving contact surfaces.
  • grease is prepared by mixing a thickener, and, as required, additives, to a lubricant base oil.
  • Hydroxyfatty acid metal salts are used as a thickener for grease (see, for example, PTL 3).
  • the hydroxyfatty acid metal salts used as a thickener are mostly lithium 12-hydroxystearate, and an ⁇ - or ⁇ -hydroxyfatty acid metal salt is not used. It is also known that use of this type of compound as an grease additive results in a shorter life, though it improves antirust performance (for example, PTL 4).
  • JP 2006 307023 A discloses a lubricating grease composition comprising a blended thickener.
  • the present invention was made under these circumstances, and it is an object of the present invention to provide a grease composition that is capable of reducing an amount of wear in sliding parts of various members of automobiles, electrical devices, and the like.
  • the present inventors diligently worked to achieve the foregoing object, and found that an amount of wear can be greatly reduced by the synergy between metal salts of specific hydroxycarboxylic acids and an amide compound.
  • the present invention was completed on the basis of this finding, and includes the following.
  • a lubrication method comprising using the grease composition.
  • the grease composition of the present invention is highly effective at greatly reducing wear in sliding parts of various members of automobiles, electrical devices, and the like.
  • a lubricant base oil of the present invention may be a mineral or a synthetic lubricant base oil, as long as it is a lubricant base oil commonly used for grease.
  • the lubricant base oil has a kinetic viscosity at 40°C of preferably 1 to 500 mm 2 /s, more preferably 5 to 100 mm 2 /s.
  • a grease composition having desirable consistency can be prepared with ease when the kinetic viscosity at 40°C is 1 to 500 mm 2 /s.
  • a lubricant base oil of physical properties with a viscosity index of 90 or more, particularly 95 to 250, a pour point of -10°C or less, particularly -15 to -70°C, and a flash point of 150°C or more.
  • the lubricant base oil When containing a solid lubricant, the lubricant base oil preferably has a density of 0.75 to 0.95 g/cm 3 at a lubricant base oil temperature of 15°C.
  • the density is particularly preferably 0.8 to 0.9 g/cm 3 .
  • the mineral lubricant base oil may be a lubricant oil fraction obtained through purification of a distillate oil by various purification processes after distillation of a crude oil under ordinary pressure or under ordinary pressure and reduced pressure.
  • the purification processes include, for example, hydrorefining, solvent extraction, solvent dewaxing, hydrodewaxing, sulfuric acid washing, and clay treatment.
  • the base oil of the present invention can be obtained from a combination of these processes performed in appropriate order. A mixture of different refined oils of different qualities obtained by treating different crude oils or different distillate oils with a combination of different processes in different order is also useful. Regardless of the method, the base oil can be desirably used when the base oil quality is adjusted to satisfy the foregoing density.
  • the synthetic lubricant base oil uses preferably a base material having desirable hydrolytic stability.
  • base materials include polyolefins such as poly- ⁇ -olefins, polybutene, and a copolymer of two or more olefins; polyesters, polyalkylene glycols, alkylbenzenes, and alkylnaphthalenes.
  • Poly- ⁇ -olefins are preferred for availability, cost, viscosity characteristics, oxidation stability, and compatibility with system components. Further preferred for cost are poly- ⁇ -olefins made by polymerizing olefins such as 1-dodecene, and 1-decene.
  • ester-based base oils for example, such as a polyolester of a polyalcohol and a monovalent carboxylic acid, and a diester of a divalent carboxylic acid and an alcohol.
  • Preferred are polyolesters obtained from a polyalcohol selected from neopentyl glycol, trimethylolpropane, and pentaerythritol, and a fatty acid of 4 to 22 carbon atoms.
  • the fatty acid is particularly preferably a fatty acid of 12 to 20 carbon atoms, particularly an unsaturated fatty acid.
  • the lubricant base oil may use base oils other than the poly- ⁇ -olefinic base oil and the ester-based base oil. It is, however, preferable to contain 80 mass% or more, particularly 90 mass% or more of the poly- ⁇ -olefin or ester-based base oil with respect to the mass of the lubricant base oil.
  • the synthetic lubricant base oil may be used alone or as a mixture of two or more. It is also possible to use the synthetic lubricant base oil as a mixture with the mineral base oil.
  • the content of the lubricant base oil is preferably 50 to 95 mass%, particularly preferably 60 to 85 mass% with respect to the total amount of the grease composition.
  • a grease composition having desirable consistency can be prepared with ease when the lubricant base oil content is 50 to 95 mass %.
  • a metal soap-based thickener or a urea-based thickener is used.
  • the thickener may be used alone or as a mixture of two or more.
  • the thickener may be contained in any amount, as long as the desired consistency is obtained.
  • the thickener content is preferably 2 to 30 mass %, further preferably 5 to 20 mass% with respect to the total amount of the grease composition.
  • the metal soap-based thickener is a thickener of a carboxylic acid metal salt.
  • the carboxylic acid may be a derivative of carboxylic acids having a hydroxy group.
  • the carboxylic acids may be aliphatic carboxylic acids such as stearic acid, and azelaic acid, or aromatic carboxylic acids such as terephthalic acid.
  • Monovalent or divalent aliphatic carboxylic acids particularly aliphatic carboxylic acids of 6 to 20 carbon atoms are used. Particularly preferred for use are monovalent aliphatic carboxylic acids of 12 to 20 carbon atoms, and divalent aliphatic carboxylic acids of 6 to 14 carbon atoms.
  • Monovalent aliphatic carboxylic acids having one hydroxyl group are preferred.
  • the metal may be an alkali metal such as lithium and sodium, an alkali earth metal such as calcium, or an amphoteric metal such as aluminum. Preferred are alkali metals, particularly lithium.
  • Metal salts of ⁇ - or ⁇ -hydroxyfatty acids are not preferred as thickener because of poor thickening capability.
  • the thickener may be added in the form of a metal soap, or as a metal-soap thickener by separately adding the carboxylic acid and a metal source (e.g., a metal salt, a metal salt hydroxide), and causing these to react at the time of grease production.
  • a metal source e.g., a metal salt, a metal salt hydroxide
  • the carboxylic acid metal salt may be used alone or as a mixture of two or more.
  • a mixture of lithium 12-hydroxystearate and lithium azelate is particularly preferred.
  • the urea-based thickener may be, for example, a diurea compound obtained by a reaction of a diisocyanate and a monoamine, or a polyurea compound obtained by a reaction of a diisocyanate with a monoamine or a diamine.
  • Diisocyanates are compounds in which two of the hydrogen atoms of the hydrocarbon are substituted with isocyanate groups.
  • Preferred examples of the diisocyanates include phenylene diisocyanate, tolylene diisocyanate, diphenyl diisocyanate, diphenylmethane diisocyanate, octadecane diisocyanate, decane diisocyanate, and hexane diisocyanate.
  • the hydrocarbon may be a non-cyclic hydrocarbon or a cyclic hydrocarbon, or an aromatic hydrocarbon, an alicyclic hydrocarbon, or an aliphatic hydrocarbon.
  • the hydrocarbon is an aromatic hydrocarbon.
  • the hydrocarbon has preferably 4 to 20 carbon atoms, particularly 8 to 18 carbon atoms.
  • Monoamines are compounds in which one of the hydrogen atoms of the ammonia is substituted with a hydrocarbon group.
  • Preferred examples of the monoamines include octylamine, dodecylamine, hexadecylamine, stearylamine, oleylamine, aniline, p-toluidine, and cyclohexylamine.
  • Diamines are compounds in which two of the hydrogen atoms of the ammonia are substituted with hydrocarbon groups.
  • the diamines include ethylenediamine, propanediamine, butanediamine, hexanediamine, octanediamine, phenylenediamine, tolylenediamine, xylenediamine, and diaminodiphenylmethane.
  • the hydrocarbon groups of the monoamines and diamines may be non-cyclic hydrocarbon groups or cyclic hydrocarbon groups, or aromatic hydrocarbon groups, alicyclic hydrocarbon groups, or aliphatic hydrocarbon groups.
  • the monoamines and diamines contain aliphatic hydrocarbon groups.
  • the monoamines and diamines have preferably 2 to 20 carbon atoms, particularly preferably 4 to 18 carbon atoms.
  • the present invention contains at least one of an ⁇ -hydroxycarboxylic acid metal salt, and an ⁇ -hydroxycarboxylic acid metal salt. It is preferable to contain both an ⁇ -hydroxycarboxylic acid metal salt, and an ⁇ -hydroxycarboxylic acid metal salt, though only one of these may be contained.
  • the metallic element forming the salt is preferably an alkali metal or an alkali earth metal, particularly preferably calcium or barium.
  • the total content of the hydroxycarboxylic acid metal salts is 0.1 to 2 mass%, preferably 0.2 to 1 mass% with respect to the total amount of the grease composition. The wear reducing effect will not be obtained when the total content of the hydroxycarboxylic acid metal salts is less than 0.1 mass%, whereas the hydroxycarboxylic acid metal salt may inhibit the effects of other components when the content is above 2 mass%.
  • the ⁇ - and ⁇ -hydroxycarboxylic acids are preferably monovalent, more preferably monovalent acids of 8 to 24 carbon atoms.
  • the monovalent ⁇ -hydroxycarboxylic acid is represented by R 1 -CH(-OH)-COOH, and the ⁇ -hydroxycarboxylic acid is represented by HO-CH 2 -R 2 -COOH.
  • R 1 is preferably an alkyl group of 1 to 38 carbon atoms, or an alkenyl group of 2 to 38 carbon atoms, more preferably an alkyl group of 6 to 22 carbon atoms, or an alkenyl group of 6 to 22 carbon atoms.
  • R 2 is preferably an alkylene group of 1 to 38 carbon atoms, or an alkenylene group of 2 to 38 carbon atoms, more preferably an alkylene group of 6 to 22 carbon atoms, or an alkenylene group of 6 to 22 carbon atoms.
  • the present invention further contains metal salts of hydroxycarboxylic acids other than ⁇ - and ⁇ -hydroxycarboxylic acids, or metal salts of carboxylic acids containing no hydroxyl group.
  • carboxylic acid metal salts include alkali metal salts or alkali earth metals, preferably calcium or barium salts of ⁇ - and ⁇ -hydroxycarboxylic acids in which the hydroxyl group is substituted at different positions from the foregoing ⁇ - and ⁇ -hydroxycarboxylic acids, or in which two or more hydroxyl groups are substituted, and alkali metal salts or alkali earth metals, preferably calcium or barium salts of carboxylic acids that do not have a substitution of the hydroxyl group.
  • the hydroxycarboxylic acids, and the carboxylic acids may be obtained by chemical synthesis. It is, however, preferable to use a lanolin fatty acid - an acid obtained through purification (e.g., hydrolysis) of a wax-like substance adhering to sheep hairs - as a raw material of these acids.
  • a lanolin fatty acid an acid obtained through purification (e.g., hydrolysis) of a wax-like substance adhering to sheep hairs -
  • the ⁇ - and ⁇ -hydroxycarboxylic acids, and other preferred carboxylic acids may be separately used. It is, however, preferable to prepare the lanolin fatty acid directly into a metal salt, without separating these acids.
  • the present invention further contains an amide compound.
  • the amide compound which is a compound having at least one amide group (-NH-CO-), may be a compound containing one amide group (monoamide), or a compound containing two amide groups (bisamide).
  • amide compound a compound having at least one amide group (monoamide), or a compound containing two amide groups (bisamide).
  • saturated aliphatic monoamides, or saturated aliphatic bisamides are used.
  • the saturated aliphatic bisamides are most preferred for their advantages including desirable heat resistance, and the ability to reduce the frictional resistance at a sliding part even with a relatively small amount.
  • the saturated aliphatic monoamides are amide compounds of a saturated aliphatic monoamine and a saturated aliphatic monocarboxylic acid.
  • the saturated aliphatic bisamides may be amide compounds of a saturated aliphatic diamine and a saturated aliphatic monocarboxylic acid, or amide compounds of a saturated aliphatic dicarboxylic acid and a saturated aliphatic monoamine.
  • a preferred saturated aliphatic amide compound has a melting point of 100 to 170°C, and a molecular weight of 298 to 876.
  • the saturated aliphatic monoamides are represented by the following general formula (1).
  • the saturated aliphatic bisamides are represented by the following general formulae (2) and (3).
  • R 11 -CO-NH-R 12 ... (1)
  • R 13 -CO-NH-A 1 -NH-CO-R 14 ...
  • R 15 -NH-CO-A 2 -CO-NH-R 16 ...
  • R 11 , R 12 , R 13 , R 14 , R 15 , and R 16 each independently represent a saturated aliphatic hydrocarbon group of 5 to 25 carbon atoms.
  • R 12 may be hydrogen.
  • a 1 and A 2 represent divalent saturated aliphatic hydrocarbon groups of 1 to 10 carbon atoms, and are preferably divalent saturated chain hydrocarbon groups of 1 to 4 carbon atoms.
  • saturated aliphatic monoamides include lauramide, palmitamide, stearamide, and behenamide.
  • Preferred examples of the saturated aliphatic bisamides represented by formula (2) include ethylene bis(stearamide), ethylene bis(isostearamide), ethylene bis(lauramide), and methylene bis(lauramide).
  • Preferred examples of the saturated aliphatic bisamides represented by formula (3) include N,N'-bisstearylsebacamide.
  • the bisamides are preferably amide compounds in which R 13 , R 14 , R 15 , and R 16 in formulae (2) and (3) are each independently a saturated chain hydrocarbon group of 12 to 20 carbon atoms.
  • the amide compounds may be used alone or in a combination of two or more in any proportions.
  • the content of the amide compound is preferably 1 to 30 mass%, more preferably 5 to 20 mass% with respect to the total amount of the grease composition.
  • the amide compound when thermofused in the presence of the lubricant base oil, produces a state in which the lubricant base oil is held in the amide compound forming a three-dimensional network structure. This further lowers the coefficient of friction at a sliding part than when the amide compound is simply dispersed or mixed in the grease.
  • the present invention further contains a solid lubricant component.
  • the solid lubricant component may be, for example, melamine cyanurate, molybdenum disulfide, boron nitride, graphite, mica, fluororesin, fluorinated graphite, or a molybdenum organic compound commonly used for lubricants.
  • the content of the solid lubricant component is preferably 0.1 to 10 mass%, more preferably 0.2 to 5 mass% with respect to the total amount of the grease composition.
  • boron nitride or melamine cyanurate as the solid lubricant component.
  • a hexagonal, atmospheric-phase boron nitride (h-BN) powder of a particle size suited for the intended purpose may be appropriately selected and used.
  • the solid lubricant component has a particle diameter of preferably 1 to 10 ⁇ m.
  • Additives commonly used for lubricant oils and greases may be appropriately added, as required, to the grease composition of the present invention, in addition to the foregoing components.
  • additives include cleaners, dispersants, antiwear agents, viscosity index improvers, antioxidants, extreme-pressure agents, anti-rusting agents, and corrosion inhibitors.
  • the grease composition of the present invention is preferably used at sliding parts, preferably for lubrication of various sliding members, for example, between metal parts, metal and resin parts, and resin parts.
  • the sliding member resin may be a natural resin or a synthetic resin.
  • synthetic resins are general-purpose plastics (e.g., polyethylene, polystyrene, polypropylene, and polyvinyl chloride), and engineering plastics. Engineering plastics are particularly preferred in terms of heat resistance, and mechanical strength.
  • synthetic resins include polyamide resins, polyacetal resins, polycarbonate resins, polysulfone resins, polyphenylene sulfide resins, polyamideimide resins, polyetheretherketone resins, phenolic resins, polyester resins, and epoxy resins.
  • the grease composition is particularly preferred for lubrication of polyamide resins, and polyoxymethylene resins.
  • Examples of the applicable areas of the grease composition of the present invention include transport machinery such as automobiles, railway, and aircraft; industrial machines such as machine tools; home electrical appliances such as washing machines, refrigerators, and vacuum cleaners; and precision machines such as watches and cameras.
  • the grease composition has use for, for example, bearings, gears, sliding surfaces, belts, joints, and cams used for these machines.
  • the grease composition is particularly useful for improving the abrasion resistance of gears (e.g., spur wheels, helical gears, crossed helical gears, hypoid gears, worm gears, and wheel gears) exposed to a high-surface-pressure sliding environment.
  • gears e.g., spur wheels, helical gears, crossed helical gears, hypoid gears, worm gears, and wheel gears
  • Each component was put in a container in the amounts (mass%) shown in Tables 1 and 2, and heated to 150°C (a temperature equal to or greater than the melting point of the amide compound). The mixture was then stirred with a magnetic stirrer, and cooled to room temperature. The product was subjected to a dispersion process under applied pressure using rollers (three rolls) to prepare a grease composition.
  • ⁇ -hydroxycarboxylate 30 mass% Content of ⁇ -hydroxycarboxylate: 5 mass% Content of hydroxycarboxylates other than ⁇ - and ⁇ -hydroxycarboxylates: 1 mass% Content of carboxylate having no hydroxyl group: 40 mass% Number of carbon atoms in hydroxycarboxylic acid: 8 to 24 Number of carbon atoms in carboxylic acid having no hydroxyl group: 8 to 24
  • ⁇ -hydroxycarboxylate 30 mass% Content of ⁇ -hydroxycarboxylate: 5 mass% Content of hydroxycarboxylates other than ⁇ - and ⁇ -hydroxycarboxylates: 1 mass% Content of carboxylate having no hydroxyl group: 40 mass% Number of carbon atoms in hydroxycarboxylic acid: 8 to 24 Number of carbon atoms in carboxylic acid having no hydroxyl group: 8 to 24
  • the amount of wear was considerably smaller in the grease compositions of Examples that contained at least one of the ⁇ -hydroxycarboxylic acid metal salt and the ⁇ -hydroxycarboxylic acid metal salt with the thickener and the amide compound. On the other hand, there was no large reduction in the amount of wear when the hydroxycarboxylic acid metal salts were not contained, even when simple carboxylates, or a phosphite ester (a known antiwear agent) were added (Comparative Examples 1 to 7).
  • the grease composition of the present invention can greatly reduce an amount of wear in sliding members, and is useful for lubrication of sliding parts of various members of automobiles, electrical devices, and the like.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Lubricants (AREA)

Claims (7)

  1. Composition de graisse comprenant :
    une huile de base lubrifiante ;
    un épaississant, dans laquelle l'épaississant contient au moins l'un parmi un épaississant à base d'urée, et un épaississant à base de savon métallique ;
    un composé amide, et
    au moins l'un parmi un sel métallique d'un acide α-hydroxycarboxylique, et un sel métallique d'un acide ω-hydroxycarboxylique,
    dans laquelle les sels métalliques d'acide hydroxycarboxylique sont présents en une teneur totale allant de 0,1 à 2% en masse par rapport à la quantité totale de la composition de graisse.
  2. Composition de graisse selon la revendication 1, dans laquelle le sel métallique d'acide hydroxycarboxylique est un sel de métal alcalin ou un sel de métal alcalinoterreux.
  3. Composition de graisse selon la revendication 2, dans laquelle le sel métallique d'acide hydroxycarboxylique est un sel de calcium ou un sel de baryum.
  4. Composition de graisse selon l'une quelconque des revendications 1 à 3, dans laquelle l'acide hydroxycarboxylique est un acide hydroxycarboxylique monovalent ayant 8 à 24 atomes de carbone.
  5. Composition de graisse selon l'une quelconque des revendications 1 à 4, dans laquelle l'épaississant contient un épaississant à base d'urée.
  6. Composition de graisse selon l'une quelconque des revendications 1 à 5, qui comprend en outre, un composant lubrifiant solide, dans laquelle la teneur en composant lubrifiant solide se situe dans l'intervalle allant de 0,1 à 10% en masse par rapport à la quantité totale de la composition de graisse.
  7. Procédé de lubrification comprenant l'utilisation de la composition de graisse selon l'une quelconque des revendications 1 à 6 sur une pièce coulissante.
EP16761774.5A 2015-03-09 2016-03-09 Composition de graisse lubrifiante Active EP3269794B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2015046213 2015-03-09
PCT/JP2016/057275 WO2016143807A1 (fr) 2015-03-09 2016-03-09 Composition de graisse lubrifiante

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EP3269794A1 EP3269794A1 (fr) 2018-01-17
EP3269794A4 EP3269794A4 (fr) 2018-08-01
EP3269794B1 true EP3269794B1 (fr) 2021-07-28

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EP (1) EP3269794B1 (fr)
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WO (1) WO2016143807A1 (fr)

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JP7290612B2 (ja) 2020-07-20 2023-06-13 トヨタ自動車株式会社 摺動部材
JP7339214B2 (ja) 2020-07-20 2023-09-05 トヨタ自動車株式会社 摺動部材
JP7290611B2 (ja) * 2020-07-20 2023-06-13 トヨタ自動車株式会社 自動車用摺動部材

Family Cites Families (15)

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Publication number Priority date Publication date Assignee Title
US2971914A (en) * 1957-10-14 1961-02-14 Res Prod Corp Thickened oil compositions containing alkylene higher fatty acid diamides
US2980616A (en) * 1958-02-06 1961-04-18 Texaco Inc Soap thickened lubricating grease containing formamide
US5242610A (en) * 1983-01-10 1993-09-07 Mobil Oil Corporation Grease composition
JPH0631376B2 (ja) * 1988-03-09 1994-04-27 第一工業製薬株式会社 固体潤滑剤用分散剤
JPH07796B2 (ja) * 1989-08-22 1995-01-11 日本精工株式会社 高速ころがり軸受用グリース組成物
US5858029A (en) * 1997-01-13 1999-01-12 Mobil Oil Corporation Friction reducing additives for fuels and lubricants
JP4687226B2 (ja) * 2005-04-28 2011-05-25 株式会社ジェイテクト 潤滑グリース組成物を用いた転動装置およびこの転動装置を用いた電動パワーステアリング装置
JP4809626B2 (ja) * 2005-04-28 2011-11-09 昭和シェル石油株式会社 ウレア系潤滑グリース組成物
JP4863747B2 (ja) * 2006-03-28 2012-01-25 Ｊｘ日鉱日石エネルギー株式会社 冷凍機油組成物
US20080194441A1 (en) * 2007-02-09 2008-08-14 Fujifilm Corporation Grease composition, viscous agent, and mechanical element
US20090088354A1 (en) * 2007-09-27 2009-04-02 Chevron U.S.A. Inc. Lubricating grease composition and preparation
JP5721983B2 (ja) * 2010-09-14 2015-05-20 株式会社Adeka 酸化防止剤組成物及びそれを含有する潤滑油組成物
JP5931510B2 (ja) * 2012-03-05 2016-06-08 Ｊｘエネルギー株式会社 グリース組成物
JP5931509B2 (ja) * 2012-03-05 2016-06-08 Ｊｘエネルギー株式会社 グリース組成物
JP5913007B2 (ja) * 2012-08-31 2016-04-27 Ｊｘエネルギー株式会社 電動パワーステアリング装置用グリース組成物及び電動パワーステアリング装置

Also Published As

Publication number Publication date
CN107406800B (zh) 2021-06-01
EP3269794A1 (fr) 2018-01-17
EP3269794A4 (fr) 2018-08-01
US20180057768A1 (en) 2018-03-01
WO2016143807A1 (fr) 2016-09-15
JP6511128B2 (ja) 2019-05-15
CN107406800A (zh) 2017-11-28
JPWO2016143807A1 (ja) 2017-12-21

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