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
  • 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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  • 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
  • C10M169/04—Mixtures of base-materials and additives
  • C10M169/048—Mixtures of base-materials and additives the additives being a mixture of compounds of unknown or incompletely defined constitution, non-macromolecular and macromolecular compounds
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  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M135/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing sulfur, selenium or tellurium
  • C10M135/08—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing sulfur, selenium or tellurium containing a sulfur-to-oxygen bond
  • C10M135/10—Sulfonic acids or derivatives thereof
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  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M137/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing phosphorus
  • C10M137/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing phosphorus having no phosphorus-to-carbon bond
  • C10M137/04—Phosphate esters
  • C10M137/10—Thio derivatives
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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
  • C10M139/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing atoms of elements not provided for in groups C10M127/00 - C10M137/00
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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
  • C10M159/00—Lubricating compositions characterised by the additive being of unknown or incompletely defined constitution
  • C10M159/12—Reaction products
  • C10M159/20—Reaction mixtures having an excess of neutralising base, e.g. so-called overbasic or highly basic products
  • C10M159/22—Reaction mixtures having an excess of neutralising base, e.g. so-called overbasic or highly basic products containing phenol radicals
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  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M159/00—Lubricating compositions characterised by the additive being of unknown or incompletely defined constitution
  • C10M159/12—Reaction products
  • C10M159/20—Reaction mixtures having an excess of neutralising base, e.g. so-called overbasic or highly basic products
  • C10M159/24—Reaction mixtures having an excess of neutralising base, e.g. so-called overbasic or highly basic products containing sulfonic radicals
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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
  • C10M163/00—Lubricating compositions characterised by the additive being a mixture of a compound of unknown or incompletely defined constitution and a non-macromolecular compound, each of these compounds being essential
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  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
  • C10M2203/10—Petroleum or coal fractions, e.g. tars, solvents, bitumen
  • C10M2203/102—Aliphatic fractions
  • C10M2203/1025—Aliphatic fractions used as base material
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  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • 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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  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
  • C10M2207/26—Overbased carboxylic acid salts
  • C10M2207/262—Overbased carboxylic acid salts derived from hydroxy substituted aromatic acids, e.g. salicylates
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
  • C10M2209/02—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
  • C10M2209/08—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to a carboxyl radical, e.g. acrylate type
  • C10M2209/084—Acrylate; Methacrylate
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant Compositions
  • C10M2215/02—Amines, e.g. polyalkylene polyamines; Quaternary amines
  • C10M2215/04—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to acyclic or cycloaliphatic carbon atoms
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant Compositions
  • C10M2215/02—Amines, e.g. polyalkylene polyamines; Quaternary amines
  • C10M2215/06—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to carbon atoms of six-membered aromatic rings
  • C10M2215/064—Di- and triaryl amines
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant Compositions
  • C10M2215/22—Heterocyclic nitrogen compounds
  • C10M2215/223—Five-membered rings containing nitrogen and carbon only
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant Compositions
  • C10M2215/24—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant Compositions having hydrocarbon substituents containing thirty or more carbon atoms, e.g. nitrogen derivatives of substituted succinic acid
  • C10M2215/28—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
  • 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
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2223/00—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions
  • C10M2223/02—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions having no phosphorus-to-carbon bonds
  • C10M2223/04—Phosphate esters
  • C10M2223/045—Metal containing thio derivatives
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • 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
  • C10N2030/02—Pour-point; Viscosity index
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
  • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
  • C10N2030/04—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
  • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
  • C10N2030/40—Low content or no content compositions
• • 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
• • 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
  • C10N2040/08—Hydraulic fluids, e.g. brake-fluids

Definitions

• the present invention relates to a lubricating oil composition.
• Hydraulic equipment to be mounted on a construction machinery such as a hydraulic excavator, a crane, a wheel loader, and a bulldozer, is required to be operated at a high pressure, a high temperature, or a high speed, or under a high load.
• a hydraulic fluid which is used in the hydraulic equipment for construction machinery is demanded to have wear resistance or oxidation stability such that even when used at a high pressure, a high temperature, or a high speed, or under a high load over a long period of time, it does not impair performances of the hydraulic equipment.
• the hydraulic fluid which is used for construction machinery equipped with a wet type brake or a wet type clutch is required to have not only the aforementioned performances as the hydraulic fluid but also a lubricating performance for a wet type brake or a wet type clutch.
• a brake control or the like at the time of swinging is typically performed by increasing a friction coefficient required to be decreased to a certain extent from the standpoint of application to the hydraulic equipment.
• PTL 1 investigates a hydraulic fluid composition for construction machinery having excellent wear resistance and sludge generation suppression properties even under a high-temperature and high-pressure condition while it is a zinc-based one, having a low kinematic friction coefficient for controlling the actions at the time of starting or just before stop, and having a high static friction coefficient to such an extent that a brake performance by a wet type brake is not impaired.
• PTL 1 discloses a hydraulic fluid composition for construction machinery containing a base oil, a zinc dialkyldithiophosphate, basic calcium salicylate, and an ashless friction modifier containing a nitrogen atom or an oxygen atom but not containing phosphorus atom in specified ranges.
• the hydraulic fluid composition for construction machinery as described in PTL 1 contains calcium salicylate as a dispersant.
• a ratio of a kinematic friction coefficient ⁇ 0 just before stop to a kinematic friction coefficient ⁇ d during operation [ ⁇ 0 / ⁇ d ] is considerably low as 0.750 or less.
• the hydraulic fluid composition for construction machinery as described in PTL 1 involves such a concern that a problem of generation of squeal in the wet type clutch test or worsening of braking properties is caused, and it is not suited for an application to machines for which braking properties are particularly required as in a crane.
• the present invention has been made, and an object thereof is to provide a lubricating oil composition which is not only excellent in oxidation stability but also favorable in an effect for suppressing the generation of squeal and braking properties, and which is suitably applicable to machines equipped with a wet type brake or a wet type clutch.
• the present inventors have found that a lubricating oil composition containing zinc dithiophosphate and further containing a metal sulfonate and an ashless friction modifier containing a boronated alkenyl succinimide is able to solve the aforementioned problem, thereby leading to accomplishment of the present invention.
• the present invention relates to the following [1] to [3].
• the lubricating oil composition of the present invention is not only excellent in oxidation stability but also favorable in an effect for suppressing the generation of squeal and braking properties. For that reason, it is suitably applicable to machines equipped with a wet type brake or wet type clutch.
• each of atoms means a value as measured in conformity with the following standards.
• the lubricating oil composition of the present invention contains a base oil (A), zinc dithiophosphate (B), a metal sulfonate (C), and an ashless friction modifier (D) containing a boronated alkenyl succinimide (D1).
• the lubricating oil composition of an embodiment of the present invention may further contain an antioxidant (E) according to the content of the zinc dithiophosphate (B).
• the lubricating oil composition of an embodiment of the present invention may also contain other additives for lubricating oil not corresponding to the aforementioned components within a range where the effects of the present invention are not impaired.
• the total content of the component (A), the component (B), the component (C), and the component (D) based on the total amount (100% by mass) of the lubricating oil composition is preferably 60% by mass or more, more preferably 70% by mass or more, still more preferably 75% by mass or more, and yet still more preferably 80% by mass or more, and it is typically 100% by mass or less, preferably 99.0% by mass or less, and more preferably 98.0% by mass or less.
• the total content of the component (A), the component (B), the component (C), the component (D), and the component (E) based on the total amount (100% by mass) of the lubricating oil composition is preferably 65% by mass or more, more preferably 70% by mass or more, still more preferably 75% by mass or more, and yet still more preferably 80% by mass or more, and it is typically 100% by mass or less, preferably 99.5% by mass or less, and more preferably 99.0% by mass or less.
• the lubricating oil composition of the present invention is one to be used for a machine equipped with at least one of a wet type brake and a wet type clutch.
• a lubricating oil composition which is used for the hydraulic equipment is also used for a wet type brake or a wet type clutch of a traction motor or a swing motor, etc. with which the foregoing machine is equipped.
• the lubricating oil composition which is used for a machine equipped with a wet type brake or a wet type clutch is required to have not only excellent oxidation stability that is a performance as the hydraulic fluid but also such characteristics that a friction coefficient is high to a certain extent, and an effect for suppressing the generation of squeal or braking properties are favorable so as to make it applicable for lubrication of a wet type brake or a wet type clutch.
• a ratio of a kinematic friction coefficient ⁇ 0 just before stop to a kinematic friction coefficient ⁇ d during operation [ ⁇ 0 / ⁇ d ] tends to become low.
• the foregoing ratio [ ⁇ 0 / ⁇ d ] is considerably low as 0.750 or less.
• the lubricating oil composition of the present invention in view of the fact that it contains, as a dispersant, the metal sulfonate (C) but not a metal salicylate, together with the base oil (A) and the zinc dithiophosphate (B) and further contains, as a friction modifier, the ashless friction modifier (D) containing the boronated alkenyl succinimide (D1) containing a nitrogen atom and an oxygen atom, not only excellent oxidation stability is kept, but also an effect for suppressing the generation of squeal is high, and braking properties are improved, too.
• the base oil (A) which is contained in the lubricating oil composition of the present invention may be a mineral oil, may be a synthetic oil, or may be a mixed oil of a mineral oil and a synthetic oil.
• mineral oil examples include atmospheric residues obtained through atmospheric distillation of crude oils, such as paraffin-based crude oils, intermediate-base crude oils, and naphthene-based crude oils; distillates obtained through reduced-pressure distillation of such atmospheric residues; mineral oils obtained by purifying the distillates through one or more purification treatments, such as solvent deasphalting, solvent extraction, hydrocracking, solvent dewaxing, catalytic dewaxing, and hydrorefining; and mineral oils (GTL) obtained by isomerizing a wax (GTL wax (Gas To Liquids WAX)) which is obtained by synthesis of a natural gas through the Fischer-Tropsch method, etc.
• crude oils such as paraffin-based crude oils, intermediate-base crude oils, and naphthene-based crude oils
• distillates obtained through reduced-pressure distillation of such atmospheric residues
• mineral oils obtained by purifying the distillates through one or more purification treatments, such as solvent deasphalting, solvent extraction, hydrocracking, solvent dewaxing
• mineral oils may be used alone or may be used in combination of two or more thereof.
• the mineral oil which is used in an embodiment of the present invention it is preferred to contain a mineral oil having been subjected to one or more purification treatments, such as solvent deasphalting, solvent extraction, hydrocracking, solvent dewaxing, catalytic dewaxing, and hydrorefining, or a mineral oil obtained by isomerizing a GTL wax.
• purification treatments such as solvent deasphalting, solvent extraction, hydrocracking, solvent dewaxing, catalytic dewaxing, and hydrorefining, or a mineral oil obtained by isomerizing a GTL wax.
• the mineral oil it is preferred to contain a mineral oil grouped in Group 2 or Group 3 in the base oil category by API (American Petroleum Institute) or a mineral oil obtained by isomerizing a GTL wax; and it is more preferred to contain a mineral oil grouped in the foregoing Group 3 or a mineral oil obtained by isomerizing a GTL wax.
• synthetic oils examples include synthetic oils, such as poly- ⁇ -olefins, e.g., an ⁇ -olefin homopolymer and an ⁇ -olefin copolymer (for example, an ⁇ -olefin copolymer having 8 to 14 carbon atoms, e.g., an ethylene- ⁇ -olefin copolymer); isoparaffins; esters, e.g., a polyol ester and a dibasic acid ester; ethers, e.g., polyphenyl ether; polyalkylene glycols; alkylbenzenes; and alkylnaphthalenes.
• synthetic oils such as poly- ⁇ -olefins, e.g., an ⁇ -olefin homopolymer and an ⁇ -olefin copolymer (for example, an ⁇ -olefin copolymer having 8 to 14 carbon atoms, e.g., an ethylene-
• These synthetic oils may be used alone or may be used in combination of two or more thereof.
• synthetic oil which is used in an embodiment of the present invention, it is preferred to contain one or more synthetic oils selected from poly- ⁇ -olefins, various esters, and polyalkylene glycols.
• a kinematic viscosity at 40°C of the base oil (A) is preferably 10 to 150 mm 2 /s, more preferably 12 to 120 mm 2 /s, and still more preferably 15 to 100 mm 2 /s.
• a viscosity index of the base oil (A) is preferably 80 or more, more preferably 100 or more, and still more preferably 110 or more.
• kinematic viscosity at 40°C and the “viscosity index” mean values as measured in conformity of JIS K2283.
• the base oil (A) is a mixed oil of two or more selected from mineral oils and synthetic oils
• the kinematic viscosity and the viscosity index of the mixed oil have to only fall within the aforementioned ranges, respectively.
• the content of the base oil (A) based on the total amount (100% by mass) of the lubricating oil composition is typically 55% by mass or more, preferably 60% by mass or more, more preferably 65% by mass or more, still more preferably 70% by mass or more, and yet still more preferably 75% by mass or more, and it is preferably 98% by mass or less, more preferably 97% by mass or less, still more preferably 95% by mass or less, and yet still more preferably 93% by mass or less.
• the lubricating oil composition of the present invention contains the zinc dithiophosphate (B), it improves wear resistance and oxidation stability and effectively suppresses metal wear and oxidation degradation generated following the use.
• the zinc dithiophosphate (B) which is contained in the lubricating oil composition of an embodiment of the present invention is preferably a compound represented by the following general formula (b-1).
• the zinc dithiophosphate (B) may be used alone or may be used in combination of two or more thereof.
• R 1 to R 4 each independently represent a hydrocarbon group and may be the same as or different from each other.
• R 1 to R 4 an alkyl group is preferred as R 1 to R 4 .
• alkyl group may be either a linear alkyl group or a branched alkyl group, it is preferably a branched alkyl group.
• the carbon number of the hydrocarbon group which may be selected as R 1 to R 4 is preferably 1 to 20, more preferably 3 to 16, still more preferably 4 to 12, and yet still more preferably 5 to 10.
• the content of the component (B) as expressed in terms of a zinc atom based on the total amount (100% by mass) of the lubricating oil composition is preferably 100 ppm by mass or more, more preferably 150 ppm by mass or more, still more preferably 200 ppm by mass or more, and yet still more preferably 250 ppm by mass or more, and from the viewpoint of more improving the wear resistance, it is even yet still more preferably 500 ppm by mass or more, and especially preferably 600 ppm by mass or more.
• the content of the component (B) as expressed in terms of a zinc atom based on the total amount (100% by mass) of the lubricating oil composition is preferably 2,000 ppm by mass or less, more preferably 1,500 ppm by mass or less, still more preferably 1,200 ppm by mass or less, and yet still more preferably 1,000 ppm by mass or less.
• the content (blending amount) of the component (B) is typically 0.01 to 2.00% by mass, preferably 0.01 to 1.50% by mass, more preferably 0.01 to 1.00% by mass, still more preferably 0.05 to 0.90% by mass, yet still more preferably 0.10 to 0.85% by mass, and especially preferably 0.20 to 0.80% by mass based on the total amount (100% by mass) of the lubricating oil composition.
• the lubricating oil composition of the present invention contains the metal sulfonate (C), not only the effect for improving the oxidation stability owing to addition of the component (B) is effectively revealed, but also evils, such as worsening of braking properties, can be suppressed.
• the metal sulfonate (C) is preferably a metal sulfonate containing a metal atom selected from alkali metals and an alkaline earth metals; and more preferably a metal sulfonate containing a metal atom selected from a sodium atom, a calcium atom, a magnesium atom, and a barium atom.
• a metal sulfonate containing a metal atom selected from a sodium atom, a calcium atom, a magnesium atom, and a barium atom it is still more preferred to contain calcium sulfonate.
• alkali metal atom refers to a lithium atom (Li), a sodium atom (Na), a potassium atom (K), a rubidium atom (Rb), a cesium atom (Cs), and a francium atom (Fr).
• alkaline earth metal atom refers to a beryllium atom (Be), a magnesium atom (Mg), a calcium atom (Ca), a strontium atom (Sr), and a barium atom (Ba).
• the content of the calcium sulfonate in the component (C) based on the total amount (100% by mass) of the component (C) which is contained in the lubricating oil composition is preferably 70 to 100% by mass, more preferably 80 to 100% by mass, still more preferably 90 to 100% by mass, and yet still more preferably 95 to 100% by mass.
• the metal sulfonate (C) which is contained in the lubricating oil composition of an embodiment of the present invention is preferably a compound represented by the following general formula (c-1).
• the metal sulfonate (C) may be used alone or may be used in combination of two or more thereof.
• R examples include a hydrogen atom, an alkyl group having 1 to 18 carbon atoms, an alkenyl group having 1 to 18 carbon atoms, a cycloalkyl group having 3 to 18 ring carbon atoms, an aryl group having 6 to 18 ring carbon atoms, an alkylaryl group having 7 to 18 carbon atoms, and an arylalkyl group having 7 to 18 carbon atoms.
• the metal sulfonate (C) may be any of a neutral salt, a basic salt, an overbased salt, and a mixture thereof, it is preferred to contain an overbased salt.
• a base number of the neutral salt is preferably 0 to 30 mgKOH/g, more preferably 0 to 25 mgKOH/g, and still more preferably 0 to 20 mgKOH/g.
• a base number of the basic salt or overbased salt is preferably 100 to 600 mgKOH/g, more preferably 120 to 550 mgKOH/g, still more preferably 160 to 500 mgKOH/g, and yet still more preferably 200 to 480 mgKOH/g.
• base number means a base number measured by the perchloric acid method in conformity with Item 7 of JIS K2501 "Petroleum Products and Lubricating Oils-Neutralization Number Testing Method.”
• the content of the component (C) as expressed in terms of a metal atom based on the total amount (100% by mass) of the lubricating oil composition is preferably 200 ppm by mass or more, more preferably 300 ppm by mass or more, still more preferably 400 ppm by mass or more, yet still more preferably 500 ppm by mass or more, even yet still more preferably 1,000 ppm by mass or more, and even still more preferably 1,200 ppm by mass or more.
• the content of the component (C) as expressed in terms of a metal atom based on the total amount (100% by mass) of the lubricating oil composition is preferably 4,000 ppm by mass or less, more preferably 3,500 ppm by mass or less, still more preferably 2,500 ppm by mass or less, and yet still more preferably 2,000 ppm by mass or less.
• the content (blending amount) of the component (C) is preferably 0.01 to 3.0% by mass, more preferably 0.05 to 2.7% by mass, still more preferably 0.10 to 2.4% by mass, and yet still preferably 0.20 to 2.0% by mass based on the total amount (100% by mass) of the lubricating oil composition.
• a metal salicylate may be contained within a range where the effects of the present invention are not impaired, from the viewpoint of providing a lubricating oil composition in which the friction coefficient in a high-speed region is appropriately increased, and the braking properties are more improved, it is preferred that the content of the metal salicylate is low as far as possible.
• the content of the metal salicylate based on the total amount (100% by mass) of the lubricating oil composition is preferably less than 0.03% by mass, more preferably less than 0.01% by mass, still more preferably less than 0.001% by mass, and yet still more preferably less than 0.0001% by mass.
• the content of the metal salicylate relative to the total amount (100% by mass) of the component (C) which is contained in the lubricating oil composition is preferably less than 10% by mass, more preferably less than 6% by mass, still more preferably less than 3% by mass, and yet still more preferably less than 1% by mass.
• the lubricating oil composition of the present invention contains the ashless friction modifier (D) containing the boronated alkenyl succinimide (D1), not only the effect for improving the oxidation stability owing to addition of the component (B) is effectively revealed, but also evils, such as worsening of braking properties, can be suppressed.
• the effect for suppressing evils such as generation of squeal and worsening of braking properties, may be conspicuously improved as compared with the case of using only the component (C).
• the component (D) contains the boronated alkenyl succinimide (D1) and an alkenyl group-containing unsaturated amine (D2).
• a content ratio of the component (D1) to the component (D2) [(D1)/(D2)] is preferably 2 to 100, more preferably 3 to 80, still more preferably 4 to 60, yet still more preferably 5 to 50, and even yet still more preferably 7 to 40 in terms of a mass ratio.
• the lubricating oil composition of an embodiment of the present invention may contain, as the ashless friction modifier (C), other ashless friction modifier than the components (D1) and (D2) within a range where the effects of the present invention are not impaired.
• the content of the component (D1) based on the total amount (100% by mass) of the component (D) which is contained in the lubricating oil composition is preferably 50% by mass or more, more preferably 60% by mass or more, still more preferably 70% by mass or more, and yet still more preferably 80% by mass or more.
• the total content of the components (D1) and (D2) based on the total amount (100% by mass) of the component (D) which is contained in the lubricating oil composition is preferably 60 to 100% by mass, more preferably 70 to 100% by mass, still more preferably 80 to 100% by mass, and yet still more preferably 90 to 100% by mass.
• the content (blending amount) of the component (D) based on the total amount (100% by mass) of the lubricating oil composition is preferably 0.05 to 7.0% by mass, more preferably 0.10 to 5.0% by mass, still more preferably 0.20 to 4.0% by mass, and yet still more preferably 0.30 to 3.2% by mass.
• the content of a nitrogen atom derived from the component (D) based on the total amount (100% by mass) of the lubricating oil composition is preferably 15 to 900 ppm by mass, more preferably 40 to 700 ppm by mass, still more preferably 55 to 500 ppm by mass, and yet still more preferably 100 to 350 ppm by mass.
• the boronated alkenyl succinimide (D1) which is used in the present invention is a boronated product of an alkenyl succinimide, and examples of the boronated product include boron oxide, a boron halide, boric acid, boric anhydride, a boric acid ester, and an ammonium salt of boric acid.
• the boronated alkenyl succinimide (D1) is preferably a boronated product of a compound represented by the following general formula (d-11) or (d-12).
• the component (D1) may also be a boronated product of polybutenyl succinimide obtained through a reaction between a compound represented by the following general formula (d-11) or (d-12) and at least one compound selected from an alcohol, an aldehyde, a ketone, an alkylphenol, a cyclic carbonate, an epoxy compound, and an organic acid.
• Examples of the alkenyl group which may be selected as R A , R A1 , and R A2 include a polybutenyl group, a polyisobutenyl group, and a group containing an ethylene-propylene unit. Of these, a polybutenyl group or a polyisobutenyl group is preferred.
• the compound represented by the general formula (d-11) can be, for example, produced by allowing an alkenyl succinic anhydride obtained through a reaction between a polyolefin and maleic anhydride, to react with a polyamine.
• polystyrene resin examples include polymers obtained through polymerization of one or more compounds selected from ⁇ -olefins having 2 to 8 carbon atoms. Of these, a copolymer of isobutene and 1-butene is preferred.
• polyamine examples include simple diamines, such as ethylenediamine, propylenediamine, butylenediamine, and pentylenediamine; polyalkylenepolyamines, such as diethylenetriamine, triethylenetetramine, tetraethylenepentamine, pentaethylenehexamine, di(methylethylene)triamine, dibutylenetriamine, tributylenetetramine, and pentapentylenehexamine; and piperazine derivatives, such as aminoethylpiperazine.
• simple diamines such as ethylenediamine, propylenediamine, butylenediamine, and pentylenediamine
• polyalkylenepolyamines such as diethylenetriamine, triethylenetetramine, tetraethylenepentamine, pentaethylenehexamine, di(methylethylene)triamine, dibutylenetriamine, tributylenetetramine, and pentapentylenehexamine
• piperazine derivatives such as amino
• the compound represented by the general formula (d-12) can be, for example, produced by allowing an alkenyl succinic anhydride obtained through a reaction between the aforementioned polyolefin and maleic anhydride, to react with the aforementioned polyamine.
• a mass ratio [B/N] of a boron atom to a nitrogen atom constituting the component (D1) is preferably 0.2 to 3.0, more preferably 0.4 to 2.5, still more preferably 0.6 to 2.0, and yet still more preferably 0.7 to 1.5.
• the content of the component (D1) as expressed in terms of a boron atom based on the total amount (100% by mass) of the lubricating oil composition is preferably 30 to 600 ppm by mass, more preferably 50 to 500 ppm by mass, still more preferably 60 to 400 ppm by mass, and yet still more preferably 80 to 300 ppm by mass.
• the content of the component (D1) as expressed in terms of a nitrogen atom based on the total amount (100% by mass) of the lubricating oil composition is preferably 10 to 800 ppm by mass, more preferably 30 to 600 ppm by mass, still more preferably 50 to 400 ppm by mass, and yet still more preferably 80 to 300 ppm by mass.
• the content (blending amount) of the component (D1) is preferably 0.05 to 4.0% by mass, more preferably 0.10 to 3.0% by mass, still more preferably 0.20 to 2.5% by mass, and yet still more preferably 0.30 to 2.0% by mass based on the total amount (100% by mass) of the lubricating oil composition.
• alkenyl group-containing unsaturated amine (D2) which is used in an embodiment of the present invention include primary to tertiary unsaturated amines having 1 to 3 alkenyl groups.
• the carbon number of the alkenyl group is preferably 2 to 30, more preferably 4 to 26, still more preferably 8 to 24, and yet still more preferably 10 to 20.
• alkenyl group may be either a linear alkenyl group or a branched alkenyl group, it is preferably a linear alkenyl group.
• the unsaturated amine (D2) contains a primary unsaturated amine (D21) having an alkenyl group having 2 to 30 carbon atoms.
• the content of the primary unsaturated amine (D21) in the component (D2) based on the total amount (100% by mass) of the component (D2) which is contained in the lubricating oil composition is preferably 70 to 100% by mass, more preferably 80 to 100% by mass, still more preferably 90 to 100% by mass, and yet still more preferably 95 to 100% by mass.
• the primary unsaturated amine (D21) is preferably a compound represented by the following general formula (d-2).
• H 2 N-(CH 2 ) z1 -CH CH-(CH 2 ) z2 -H (d-2)
• z1 and z2 are each independently an integer of 0 or more, and (z1 + z2) is an integer of 0 to 28. (z1 + z2) is preferably 2 to 24, more preferably 6 to 22, and still more preferably 7 to 18.
• the content of the component (D2) as expressed in terms of a nitrogen atom based on the total amount (100% by mass) of the lubricating oil composition is preferably 5 to 100 ppm by mass, more preferably 10 to 80 ppm by mass, still more preferably 15 to 60 ppm by mass, and yet still more preferably 20 to 50 ppm by mass.
• the content (blending amount) of the component (D2) is preferably 0.001 to 3.0% by mass, more preferably 0.005 to 2.0% by mass, still more preferably 0.01 to 1.5% by mass, and yet still more preferably 0.02 to 1.2% by mass based on the total amount (100% by mass) of the lubricating oil composition.
• the lubricating oil composition of an embodiment of the present invention may contain, as the ashless friction modifier (C), other ashless friction modifier than the components (D1) and (D2) within a range where the effects of the present invention are not impaired.
• Examples of the other ashless friction modifier include an aliphatic amine having an alkyl group having 2 to 30 carbon atoms, other than the components (D1) and (D2); a compound having an alkenyl group or an alkyl group each having 2 to 30 carbon atoms, which is selected from a fatty acid ester, a fatty acid amide, a fatty acid, an aliphatic alcohol, and an aliphatic ether; a phosphoric acid ester; and a non-boronated alkenyl succinimide.
• an aliphatic amine having an alkyl group having 2 to 30 carbon atoms other than the components (D1) and (D2)
• a compound having an alkenyl group or an alkyl group each having 2 to 30 carbon atoms which is selected from a fatty acid ester, a fatty acid amide, a fatty acid, an aliphatic alcohol, and an aliphatic ether
• a phosphoric acid ester and a non
• a non-boronated alkenyl succinimide may be contained within a range where the effects of the present invention are not impaired; however, it is preferred that the content of the non-boronated alkenyl succinimide is low.
• the content of the non-boronated alkenyl succinimide based on the total amount (100% by mass) of the component (D1) which is contained in the lubricating oil composition is preferably less than 10% by mass, more preferably less than 6% by mass, still more preferably less than 3% by mass, and yet still more preferably less than 1% by mass.
• the lubricating oil composition of an embodiment of the present invention may further contain an antioxidant (E) according to the content of the zinc dithiophosphate (B).
• antioxidant (E) examples include a phenol-based antioxidant, an amine-based antioxidant, a molybdenum-based antioxidant, a sulfur-based antioxidant, and a phosphorus-based antioxidant.
• the antioxidant (E) may be used alone or may be used in combination of two or more thereof.
• the antioxidant (E) contains a phenol-based antioxidant (E1) and an amine-based antioxidant (E2).
• phenol-based antioxidant (E1) examples include monophenol-based antioxidants, such as 2,6-di-t-butylphenol, 2,6-di-t-butyl-4-methylphenol, 2,6-di-t-butyl-4-ethylphenol, isooctyl-3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate, and octadecyl-3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate; diphenol-based antioxidants, such as 4,4'-methylenebis(2,6-di-t-butylphenol) and 2,2'-methylenebis(4-ethyl-6-t-butylphenol); and hindered phenol-based antioxidants.
• monophenol-based antioxidants such as 2,6-di-t-butylphenol, 2,6-di-t-butyl-4-methylphenol, 2,6-di-t-butyl-4-ethy
• the amine-based antioxidant (E2) is preferably an aromatic amine compound, and more preferably at least one selected from a diphenylamine compound and a naphthylamine-based compound.
• diphenylamine-based compound examples include monoalkyldiphenylamine-based compounds having one alkyl group having 1 to 30 carbon atoms (preferably 4 to 30 carbon atoms, and more preferably 8 to 30 carbon atoms), such as monooctyldiphenylamine and monononyldiphenylamine; dialkyldiphenylamine compounds having two alkyl groups having 1 to 30 carbon atoms (preferably 4 to 30 carbon atoms, and more preferably 8 to 30 carbon atoms), such as 4,4'-dibutyldiphenylamine, 4,4'-dipentyldiphenylamine, 4,4'-dihexyldiphenylamine, 4,4'-diheptyldiphenylamine, 4,4'-dioctyldiphenylamine, and 4,4'-dinonyldiphenylamine; polyalkyldiphenylamine-based compounds having three or more alkyl groups having 1 to 30 carbon atoms (preferably 4
• naphthylamine-based compound examples include 1-naphthylamine, phenyl-1-naphthylamine, butylphenyl-1-naphthylamine, pentylphenyl-1-naphthylamine, hexylphenyl-1-naphthylamine, heptylphenyl-1-naphthylamine, octylphenyl-1-naphthylamine, nonylphenyl-1-naphthylamine, decylphenyl-1-naphthylamine, and dodecylphenyl-1-naphthylamine.
• Examples of the molybdenum-based antioxidant include a molybdenum amine complex obtained through a reaction between molybdenum trioxide and/or molybdic acid and an amine compound.
• sulfur-based antioxidant examples include dilauryl-3,3'-thiodipropionate.
• Examples of the phosphorus-based antioxidant include a phosphite and diethyl 3,5-di-t-butyl-4-hydroxybenzylphosphonate.
• a mass ratio [(E1)/(E2)] of the component (E1) to the component (E2) is preferably 1/6 to 6/1, more preferably 1/5 to 5/1, still more preferably 1/4 to 4/1, and yet still more preferably 1/3.5 to 3.5/1.
• the total content of the components (E1) and (E2) based on the total amount (100% by mass) of the component (E) which is contained in the lubricating oil composition is preferably 60 to 100% by mass, more preferably 70 to 100% by mass, still more preferably 80 to 100% by mass, and yet still more preferably 90 to 100% by mass.
• the content (blending amount) of the component (E) based on the total amount (100% by mass) of the lubricating oil composition is preferably 0.01 to 10.0% by mass, more preferably 0.05 to 7.0% by mass, still more preferably 0.10 to 5.0% by mass, and yet still more preferably 0.20 to 3.0% by mass.
• the content of the component (B) as expressed in terms of a zinc atom is 500 ppm by mass or more, even when the antioxidant (E) is not blended, the effect for suppressing the sludge deposition can be made high.
• the lubricating oil composition may not contain the antioxidant (E).
• the lubricating oil composition of an embodiment of the present invention may contain other additives for lubricating oil not corresponding to the aforementioned components (B) to (E) within a range where the effects of the present invention are not impaired.
• Examples of the other additives for lubricating oil include a viscosity index improver, a flow point depressant, an anti-wear agent, an extreme pressure agent, a metal-based friction modifier, a rust inhibitor, a metal deactivator, a demulsifier, and an anti-foaming agent.
• Each of such additives for lubricating oil may be used alone or may be used in combination of two or more thereof.
• each of such additives for lubricating oil can be properly regulated within a range where the effects of the present invention are not impaired, it is typically 0.001 to 15% by mass, preferably 0.005 to 10% by mass, and more preferably 0.01 to 8% by mass based on the total amount (100% by mass) of the lubricating oil composition.
• the additive such as a viscosity index improver and an anti-foaming agent
• the aforementioned content of the additive means the content as expressed in terms of the effective component excluding a diluent oil (expressed in terms of the resin content).
• the viscosity index improver examples include polymers, such as a non-dispersant-type polymethacrylate, a dispersant-type polymethacrylate, an olefin-based copolymer (for example, an ethylene-propylene copolymer), a dispersant-type olefin-based copolymer, and a styrene-based copolymer (for example, a styrene-diene copolymer and a styrene-isoprene copolymer).
• polymers such as a non-dispersant-type polymethacrylate, a dispersant-type polymethacrylate, an olefin-based copolymer (for example, an ethylene-propylene copolymer), a dispersant-type olefin-based copolymer, and a styrene-based copolymer).
• a weight average molecular weight (Mw) of such a viscosity index improver is typically 500 to 1,000,000, preferably 5,000 to 100,000, and more preferably 10,000 to 50,000, it is properly set according to the kind of the polymer.
• the weight average molecular weight (Mw) of each of the components is a value as expressed in terms of standard polystyrene as measured by means of gel permeation chromatography (GPC).
• Examples of the flow point depressant include ethylene-vinyl acetate copolymers, condensation products of chloroparaffin and naphthalene, condensation products of chloroparaffin and phenol, polymethacrylates, and polyalkylstyrenes.
• Examples of the anti-wear agent or the extreme pressure agent include zinc phosphate that is a phosphorus compound other than the component (B); sulfur-containing compounds, such as zinc dithiocarbamate, molybdenum dithiocarbamate, molybdenum dithiophosphate, disulfides, sulfurized olefins, sulfurized oils and fats, sulfurized esters, thiocarbonates, thiocarbamates, and polysulfides; phosphorus-containing compounds, such as phosphorous acid esters, phosphoric acid esters, phosphonic acid esters, and amine salts or metal salts thereof; and sulfur- and phosphorus-containing compounds, such as thiophosphorous acid esters, thiophosphoric acid esters, thiophosphonic acid esters, and amine salts or metal salts thereof.
• sulfur- and phosphorus-containing compounds such as thiophosphorous acid esters, thiophosphoric acid esters, thiophosphonic acid esters, and amine salts or
• metal-based friction modifier examples include molybdenum-based friction modifiers, such as molybdenum dithiocarbamate (MoDTC), molybdenum dithiophosphate (MoDTP), and amine salts of molybdic acid.
• MoDTC molybdenum dithiocarbamate
• MoDTP molybdenum dithiophosphate
• amine salts of molybdic acid examples include molybdenum-based friction modifiers, such as molybdenum dithiocarbamate (MoDTC), molybdenum dithiophosphate (MoDTP), and amine salts of molybdic acid.
• rust inhibitor examples include fatty acids, alkenylsuccinic acid half esters, fatty acid soaps, alkylsulfonic acid salts, polyhydric alcohol fatty acid esters, fatty acid amines, oxidized paraffins, and alkyl polyoxyethylene ethers.
• metal deactivator examples include benzotriazole-based compounds, tolyltriazole-based compounds, thiadiazole-based compounds, imidazole-based compounds, and pyrimidine-based compounds.
• demulsifier examples include anionic surfactants, such as sulfuric acid ester salts of castor oil and petroleum sulfonic acid salts; cationic surfactants, such as quaternary ammonium salts and imidazolines; polyoxyalkylene polyglycols and dicarboxylic acid esters thereof; and alkylene oxide adducts of an alkylphenol-formaldehyde polycondensate.
• anionic surfactants such as sulfuric acid ester salts of castor oil and petroleum sulfonic acid salts
• cationic surfactants such as quaternary ammonium salts and imidazolines
• polyoxyalkylene polyglycols and dicarboxylic acid esters thereof examples of the demulsifier.
• anti-foaming agent examples include silicone oils, fluorosilicone oils, and fluoroalkyl ethers.
• a kinematic viscosity at 40°C of the lubricating oil composition of an embodiment of the present invention is preferably 10 to 100 mm 2 /s, more preferably 13 to 75 mm 2 /s, and still more preferably 25 to 55 mm 2 /s.
• a viscosity index of the lubricating oil composition of an embodiment of the present invention is preferably 100 or more, more preferably 120 or more, and still more preferably 130 or more.
• the lubricating oil composition of the present invention not only has excellent oxidation stability but also is favorable in an effect for suppressing the generation of squeal and braking properties, and therefore, it is suitably applicable to machines equipped with at least one of a wet type brake and a wet type clutch.
• the amount of sludge generated after the test as measured in conformity with JIS B9931 is preferably less than 2.0 mg/100 mL, more preferably less than 1.5 mg/100 mL, and still more preferably less than 1.0 mg/100 mL.
• the lubricating oil composition has more excellent oxidation stability even at a high temperature.
• the aforementioned amount of sludge means a value as measured in conformity with the method described in the section of Examples as mentioned later.
• the amount of sludge generated after the test as measured in conformity with JIS B9931 is preferably less than 3.0 mg/100 mL, more preferably less than 2.0 mg/100 mL, and still more preferably less than 1.0 mg/100 mL.
• the lubricating oil composition has more excellent oxidation stability even under a high pressure.
• the aforementioned amount of sludge means a value as measured in conformity with the method described in the section of Examples as mentioned later.
• a ratio of a kinematic friction coefficient ⁇ 1 at a rotational speed of 1 rpm to a kinematic friction coefficient ⁇ 50 at a rotational speed of 50 rpm [ ⁇ 1 / ⁇ 50 ] is preferably 0.80 or more and less than 1.00, more preferably 0.80 or more and less than 0.95, and still more preferably 0.81 or more and less than 0.90.
• the kinematic friction coefficient ⁇ 1 at a rotational speed of 1 rpm is preferably 0.100 or more and less than 0.150, more preferably 0.105 or more and less than 0.140, and still more preferably 0.110 or more and less than 0.130.
• the kinematic friction coefficient ⁇ 1 can be considered to be a kinematic coefficient just before stop, whereas the kinematic friction coefficient ⁇ 50 can be considered to be a kinematic coefficient during operation.
• the ratio [ ⁇ 1 / ⁇ 50 ] is a physical properties value serving as an index of the braking properties, and so long as it falls within the aforementioned range, it may be said that the braking properties are favorable.
• kinematic friction coefficient ⁇ 1 and ratio [ ⁇ 1 / ⁇ 50 ] mean values as measured in conformity with the method described in the section of Examples as mentioned above.
• the wear amount of vanes and a cam ring as measured under a condition described in the section of Examples as mentioned later in conformity with ASTM D2882 on the occasion of driving a base pump (a product name: "V-104C", manufactured by Vickers) for 100 hours is preferably less than 40 mg, more preferably less than 36 mg, still more preferably less than 30 mg, and yet still more preferably less than 25 mg.
• the lubricating oil composition of the present invention is applied for lubrication of a wet type brake or a wet type clutch, it is able to suppress the generation of squeal and to make the braking properties favorable, and therefore, it is preferred that the lubricating oil composition of the present invention is used for machines equipped with a wet type brake or a wet type clutch and used as a hydraulic fluid composition.
• the machine is preferably a construction machinery, and more preferably a crane.
• Examples of the construction machinery as referred to herein include cranes, such as a mobile crane, a stationary crane, and a derrick; excavators, such as a hydraulic excavator, a compact excavator, and a wheel type hydraulic excavator; land grading machines, such as a bulldozer; loaders, such as a wheel loader; transporting machines, such as a rough terrain hauler; compacting machines, such as a vibratory roller; dismantling machines, such as a breaker; foundation work machines, such as a pile driver and an earth auger; concrete/asphalt machines, such as a concrete pump vehicle; an elevating work platform, a paving machine, a shielding machine, a boring machine, and a snow blower.
• cranes such as a mobile crane, a stationary crane, and a derrick
• excavators such as a hydraulic excavator, a compact excavator, and a wheel type hydraulic excavator
• land grading machines such
• the lubricating oil composition of the present invention since it has excellent braking properties, it is preferably a hydraulic fluid composition which is used for construction machineries for which braking properties are especially required, and specifically, it is more preferably a hydraulic fluid composition which is used for cranes.
• the present invention may also provide the following machines and method of using a lubricating oil composition.
• Preferred embodiments of the lubricating oil composition as prescribed in the above (1) and (2) are those as mentioned above.
• the aforementioned machine is preferably a construction machinery, and more preferably a crane.
• the present invention also provides a production method of a lubricating oil composition, including the following step (I).
• the components (A), (B), (C), and (D) which are blended in the aforementioned step (I), and the component (E) and the other additives for lubricating oil, which are blended, as the need arises, are those as mentioned above, and the kinds of suitable components and the content of each of the components are also those as mentioned above.
• the other additives for lubricating oil than these components may also be blended at the same time.
• Each of the components which are blended in the step (I) may be blended after being converted into a form of a solution (dispersion) upon addition with a diluent oil or the like. It is preferred that after blending the respective components, the blend is stirred and uniformly dispersed by a known method.
• the test of oxidation stability of lubricating oils for internal combustion engine (ISOT) in conformity with JIS K2514-1 was performed at a test temperature of 150°C for 168 hours. Then, the amount of sludge generated after the test (mg/100 mL) was measured in conformity with JIS B9931.
• the high-pressure piston pump test with a high-pressure piston pump test apparatus (pump: BOSCH-REXROTH A2F10) in conformity with JCMAS P045 was performed under a condition of a pump pressure of 35 MPa, a sample oil temperature of 80°C, and an air blowing amount of 1.0 L/h for 500 hours. Then, the amount of sludge generated after the test (mg/100 mL) was measured in conformity with JIS B9931.
• a kinematic friction coefficient ⁇ 1 at a rotational speed of 1 rpm and a kinematic friction coefficient ⁇ 50 at a rotational speed of 50 rpm were measured with a low-speed slip test apparatus (a product name: "L.V.F.A", manufactured by Automax Co., Ltd.) in conformity with JASO M349-12 under a condition of an oil temperature of 80°C and a load of 0.5 MPa. Then, a ratio of the kinematic friction coefficient ⁇ 1 to the kinematic friction coefficient ⁇ 50 [ ⁇ 1 / ⁇ 50 ] was calculated.
• V-104C a product name: "V-104C", manufactured by Vickers
• the lubricating oil compositions prepared in Examples 1 to 3 are low in the amount of sludge in the ISOT and the high-pressure piston pump test, and therefore, it may be said that the lubricating oil compositions prepared in Examples 1 to 3 are high in the oxidation stability at a high temperature and a high pressure.
• the ⁇ 1 / ⁇ 50 value is 0.80 or more and less than 1.00, it may be said that the effect for suppressing the generation of squeal is high, and the braking properties are favorable.
• the lubricating oil compositions prepared in Examples 1 to 3 are also excellent in the wear resistance.

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• 2018
  • 2018-01-19 EP EP18742030.2A patent/EP3572485A4/fr not_active Withdrawn
  • 2018-01-19 WO PCT/JP2018/001663 patent/WO2018135645A1/fr not_active Ceased
  • 2018-01-19 CN CN201880007342.2A patent/CN110168061B/zh active Active
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