EP3178911B1 - Lubricating oil composition - Google Patents

Lubricating oil composition Download PDF

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Publication number
EP3178911B1
EP3178911B1 EP15830586.2A EP15830586A EP3178911B1 EP 3178911 B1 EP3178911 B1 EP 3178911B1 EP 15830586 A EP15830586 A EP 15830586A EP 3178911 B1 EP3178911 B1 EP 3178911B1
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EP
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Prior art keywords
mass
antioxidant
acid phosphate
friction
lubricating oil
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EP15830586.2A
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German (de)
English (en)
French (fr)
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EP3178911A4 (en
EP3178911A1 (en
Inventor
Shuichi Sakanoue
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Idemitsu Kosan Co Ltd
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Idemitsu Kosan Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
    • C10M169/04—Mixtures of base-materials 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
    • C10M101/00—Lubricating compositions characterised by the base-material being a mineral or fatty oil
    • C10M101/02—Petroleum fractions
    • 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
    • C10M129/04—Hydroxy compounds
    • C10M129/10—Hydroxy compounds having hydroxy groups bound to a carbon atom of a six-membered aromatic ring
    • 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
    • C10M133/04—Amines, e.g. polyalkylene polyamines; Quaternary amines
    • C10M133/12—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to a carbon atom of a six-membered aromatic ring
    • 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
    • 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
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
    • C10M2203/003—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions used as base material
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
    • C10M2203/10—Petroleum or coal fractions, e.g. tars, solvents, bitumen
    • C10M2203/102—Aliphatic fractions
    • C10M2203/1025—Aliphatic fractions used as base material
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/02—Hydroxy compounds
    • C10M2207/023—Hydroxy compounds having hydroxy groups bound to carbon atoms of six-membered aromatic rings
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/02—Hydroxy compounds
    • C10M2207/023—Hydroxy compounds having hydroxy groups bound to carbon atoms of six-membered aromatic rings
    • C10M2207/026—Hydroxy compounds having hydroxy groups bound to carbon atoms of six-membered aromatic rings with tertiary alkyl groups
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • 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
    • 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
    • C10N2030/36—Seal compatibility, e.g. with rubber
    • 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

Definitions

  • the present invention relates to a lubricating oil composition, for instance, to a lubricating oil composition to be used for a shock absorber in an automobile and industrial machinery/device.
  • a shock absorber is provided at a connection portion between tires and a vehicle body in an automobile and is configured to damp vibration of the vehicle body caused by a bumpy road surface and acceleration/deceleration of the automobile. Accordingly, riding comfort on the automobile is considerably affected by a performance of the shock absorber.
  • Friction of the shock absorber is mainly generated on an oil seal (a rubber material) and a rod (chrome-plated) portion. Accordingly, an improvement in friction characteristics generated between the rubber material and the chrome-plated portion is a very crucial problem. Moreover, in order that the rod of the shock absorber smoothly moves in extension and contraction, an absolute value (a friction coefficient between the rubber material and metal) of rubber friction is required to be small.
  • Patent Literature 1 and 2 disclose shock absorber fluids comprising as additive phosphoric acid ester.
  • the absolute values of the rubber friction as described in non-Patent Literatures 1 and 2 are not enough to sufficiently evaluate friction characteristics, so that development of the lubricating oil having excellent friction characteristics has not been easy. Moreover, it has been found that a large workload of the friction (i.e., friction energy) is also crucial for damping vibration of the vehicle body. Further, since the shock absorber is not supposed to be replaced, the shock absorber is generally used continuously for 5 to 10 years. Accordingly, the lubricating oil used for the shock absorber is required to also have a high oxidation stability.
  • An object of the invention is to provide a lubricating oil composition having a small friction coefficient between a rubber material and metal, a large friction energy and an excellent oxidation stability.
  • a lubricating oil composition provided by blending to a base oil at least one of acid phosphate represented by formulae (1) and (2) below; and an antioxidant.
  • R 1 , R 2 and R 3 are alkyl groups. At least one of R 1 and R 2 has 20 to 30 carbon atoms while R 3 has 20 to 30 carbon atoms.
  • a lubricating oil composition having a small friction coefficient between a rubber material and metal, a large friction energy and an excellent oxidation stability can be provided.
  • a lubricating oil composition in an exemplary embodiment of the invention (hereinafter also referred to as “the present composition") is provided by blending a predetermined acid phosphate and an antioxidant to a base oil.
  • the present composition will be described in detail below.
  • the base oil used in the present composition is not particularly limited. At least one of a mineral oil and a synthetic oil may be used alone or in combination of two or more. Alternatively, a combination of the mineral oil and the synthetic oil may be used.
  • a base oil having a kinematic viscosity at 40 degrees C in a range approximately from 5 mm 2 /s to 40 mm 2 /s in order to keep suitable friction characteristics.
  • a pour point of the base oil which is an index for low-temperature fluidity, is preferably -10 degrees C or less, particularly preferably -15 degrees C or less.
  • Examples of the mineral oil include a naphthenic mineral oil, a paraffinic mineral oil, and GTL WAX.
  • the examples of the mineral oil include a light neutral oil, intermediate neutral oil, heavy neutral oil and bright stock which are obtained by solvent purification or hydrogenation purification.
  • examples of the synthetic oil include polybutene, a hydride thereof, poly-alpha-olefin (e.g., 1-octene oligomer, 1-decene oligomer), alkylbenzene, polyolester, diacid ester, polyoxyalkyleneglycol, polyoxyalkyleneglycolester, polyoxyalkyleneglycolether, hindered ester and silicone oil.
  • polybutene a hydride thereof, poly-alpha-olefin (e.g., 1-octene oligomer, 1-decene oligomer), alkylbenzene, polyolester, diacid ester, polyoxyalkyleneglycol, polyoxyalkyleneglycolester, polyoxyalkyleneglycolether, hindered ester and silicone oil.
  • polybutene e.g., 1-octene oligomer, 1-decene oligomer
  • alkylbenzene
  • Acid phosphate contained in the present composition is represented by formulae (1) and (2) below.
  • R 1 , R 2 and R 3 are alkyl groups. At least one of R 1 and R 2 has 20 to 30 carbon atoms while R 3 has 20 to 30 carbon atoms.
  • alkyl group having 20 to 30 carbon atoms examples include an eicosyl group, heneicosyl group, docosyl group, tricosyl group, tetracosyl group, pentacosyl group, hexacosyl group, heptacosyl group, octacosyl group, nonacosyl group and triacontyl group.
  • Examples of the acid phosphate represented by the formulae (1) and (2) include tetracosyl acid phosphate, ditetracosyl acid phosphate, octacosyl acid phosphate, and dioctacosyl acid phosphate when R 1 to R 3 are a tetracosyl group or an octacosyl group.
  • R 1 to R 3 are a tetracosyl group or an octacosyl group.
  • ditetracosyl acid phosphate and an example of dioctacosyl acid phosphate are schematically shown in Figs 1 and 2 , respectively.
  • the acid phosphate has an alkyl group having 20 or more carbon atoms, a friction coefficient and a friction energy are effectively improvable. Moreover, the oxidation stability is also improvable in the presence of the above-described acid phosphate.
  • the number of the carbon atoms of the above-described alkyl group is preferably 30 or less since solubility of the acid phosphate in the base oil can be secured.
  • the number of the carbon atoms of the above-described alkyl group is preferably in a range from 20 to 26, more preferably in a range from 20 to 24.
  • the alkyl group of the formulae (1) and (2) has a side chain in order to decrease the friction coefficient and increase the friction energy. Further, since the side chain serves as steric hindrance, the oxidation stability is also improvable. Specifically, at least one of R 1 and R 2 has a side chain in the formula (1), or, R 3 has a side chain in the formula (2). Further, the number of the carbon atoms of the above-described side chain is preferably in a range from 6 to 18. The side chain having 6 or more carbon atoms is preferable in terms of a decrease in the friction coefficient and an increase in the friction energy. Moreover, the side chain having 18 or less carbon atoms is preferable since solubility of the acid phosphate in the base oil becomes favorable.
  • the acid phosphate of the formula (1) is preferable to the acid phosphate of the formula (2) in terms of the decrease in the friction coefficient, the increase in the friction energy and the oxidation stability.
  • a content of the above-described acid phosphate blended with the base oil is in a range of 0.01 mass% to 3 mass% of the total amount of the composition, preferably in a range of 0.1 mass% to 2 mass%, further preferably in a range of 0.2 mass% to 1 mass%.
  • the content of the acid phosphate of 0.01 mass% or more is chosen not only in terms of the decrease in the friction coefficient and the increase in the friction energy but also the oxidation stability.
  • the content of the acid phosphate of 3 mass% or less is chosen since solubility of the acid phosphate in the base oil can be secured.
  • the present composition further contains an antioxidant.
  • an antioxidant Although the predetermined acid phosphate described above has an effect for improving the oxidation stability, use of the antioxidant in combination with the acid phosphate exhibits an outstanding oxidation stability.
  • At least one of an amine antioxidant, a phenolic antioxidant and a sulfur antioxidant is preferably usable.
  • One of the antioxidant may be used alone or a combination of two or more thereof may be used.
  • amine antioxidant examples include: monoalkyldiphenylamine compounds such as monooctyldiphenylamine and monononyldiphenylamine; dialkyldiphenylamine compounds such as 4,4'-dibutyldiphenylamine, 4,4'-dipentyldiphenylamine, 4,4'-dihexyldiphenylamine, 4,4'-diheptyldiphenylamine, 4,4'-dioctyldiphenylamine and 4,4'-dinonyldiphenylamine; polyalkyldiphenylamine compounds such as tetrabutyldiphenylamine, tetrahexyldiphenylamine, tetraoctyldiphenylamine and tetranonyldiphenylamine; and naphthylamine compounds such as ⁇ -naphthylamine, phenyl- ⁇ -naphthylamine, butylphen
  • phenolic antioxidant examples include: monophenol compounds such as 2,6-di-tert-butyl-4-methylphenol and 2,6-di-tert-butyl-4-ethylphenol; and diphenol compounds such as 4,4'-methylenebis(2,6-di-tert-butylphenol) and 2,2'-methylenebis(4-ethyl-6-tert-butylphenol).
  • sulfur antioxidant examples include: thioterpene compounds such as 2,6-di-tert-butyl-4-(4,6-bis(octylthio)-1,3,5-triazine-2-yl amino)phenol and a reactant of phosphorus pentasulfide and pinene; and dialkylthio dipropionates such as dilauryl thiodipropionate and distearyl thiodipropionate.
  • thioterpene compounds such as 2,6-di-tert-butyl-4-(4,6-bis(octylthio)-1,3,5-triazine-2-yl amino)phenol and a reactant of phosphorus pentasulfide and pinene
  • dialkylthio dipropionates such as dilauryl thiodipropionate and distearyl thiodipropionate.
  • a content of the antioxidant is from 0.01 mass% to 10 mass% based on the total amount of the composition, preferably approximately from 0.03 mass% to 5 mass%.
  • a "lubricating oil composition provided by blending a predetermined acid phosphate and an antioxidant to a base oil” encompasses not only a “lubricating oil composition containing a base oil, a predetermined acid phosphate and an antioxidant” but also a composition containing a modified substance of at least one of the "base oil,” “predetermined acid phosphate” and “antioxidant” in place of the at least one of the “base oil,” “predetermined acid phosphate” and “antioxidant” and a composition containing a reaction product obtained by reacting the "base oil,” “predetermined acid phosphate” and “antioxidant.”
  • the present composition may be added as needed with other additives such as a viscosity index improver, a pour point depressant, an antiwear agent, a friction modifier, a metal detergent, an ashless dispersant, a rust inhibitor, a metal deactivator and an antifoaming agent as long as advantages of the invention are not hampered.
  • the present composition containing the above additives encompasses a composition containing a modified substance of the additives and a composition containing a reaction product obtained by reacting the additives.
  • viscosity index improver examples include polymethacrylate, dispersed polymethacrylate, olefin copolymer (e.g. ethylene-propylene copolymer), dispersed olefin copolymer and styrene copolymer (e.g. styrene-diene copolymer and styrene-isoprene copolymer).
  • a content of the viscosity index improver is approximately in a range from 0.5 mass% to 15 mass% of the total amount of the present composition in view of the blending effect thereof.
  • An example of the pour point depressant is polymethacrylate having a mass average molecular weight approximately in a range from 10000 to 150000.
  • a preferable content of the pour point depressant is approximately in a range from 0.01 mass% to 10 mass% of the total amount of the present composition.
  • the antiwear agent examples include: a sulfur antiwear agent such as a thiophosphoric acid metal salt (e.g., Zn, Pb and Sb) and a thiocarbamic acid metal salt (e.g., Zn); and a phosphorus antiwear agent such as a phosphate (tricresyl phosphate).
  • a sulfur antiwear agent such as a thiophosphoric acid metal salt (e.g., Zn, Pb and Sb) and a thiocarbamic acid metal salt (e.g., Zn)
  • a phosphorus antiwear agent such as a phosphate (tricresyl phosphate).
  • a preferable content of the antiwear agent is approximately in a range from 0.05 mass% to 5 mass% of the total amount of the present composition.
  • the friction modifier examples include a polyhydric alcohol partial ester such as neopentyl glycol monolaurate, trimethyrol propanemonolaurate, and glycerin monooleate (oleic acid monoglyceride).
  • a preferable content of the friction modifier is approximately in a range from 0.05 mass% to 4 mass% of the total amount of the present composition.
  • the metal detergent is preferably at least one of metal salicylate, metal phenate and metal sulfonate.
  • the metal is preferably alkaline earth metal, more preferably Ca.
  • Ca salicylate is particularly preferable in order to retain the detergency.
  • a base value of the metal detergent according to a hydrochloric acid method is preferably in a range from 100 mgKOH/g to 250 mgKOH/g in order to retain the detergency.
  • a content of the metal detergent is preferably in a range from 60 mass ppm to 6000 mass ppm based on the total amount of the composition and in terms of the metal amount.
  • ashless dispersant examples include succinimides, boron-containing succinimides, benzylamines, boron-containing benzylamines, succinic acid esters, and mono- or di-carboxylic acid amides respectively represented by a fatty acid or succinic acid.
  • a preferable content of the ashless dispersant is approximately in a range from 0.1 mass% to 20 mass% of the total amount of the present composition.
  • the rust inhibitor examples include a fatty acid, alkenylsuccinic acid half ester, fatty acid soap, alkyl sulfonate, fatty acid ester of polyhydric alcohol, fatty acid amide, oxidized paraffin and alkyl polyoxyethylene ether.
  • a preferable content of the rust inhibitor is approximately in a range from 0.01 mass% to 3 mass% of the total amount of the present composition.
  • One of the metal deactivators such as benzotriazole and thiadiazole may be used alone, or a combination of two or more thereof may be used.
  • a preferable content of the metal deactivator is approximately in a range from 0.01 mass% to 5 mass% of the total amount of the present composition.
  • One of the antifoaming agents such as a silicone compound and an ester compound may be used alone, or a combination of two or more thereof may be used.
  • a preferable content of the antiwear agent is approximately in a range from 0.05 mass% to 5 mass% of the total amount of the present composition.
  • the present composition contains the acid phosphate having a predetermined structure and the antioxidant, the friction coefficient between the rubber material and the metal is small, the friction energy is large, and the oxidation stability is excellent. Accordingly, the present composition is suitably usable for the shock absorber, particularly suitably usable for the shock absorber of a four-wheel automobile (e.g., a passenger car, bus and truck) in which riding comfort is of great interest.
  • a four-wheel automobile e.g., a passenger car, bus and truck
  • the present composition is also suitably usable for a shock absorber of a two-wheel vehicle. Further, the present composition is suitably usable as hydraulic fluid. Examples
  • a kinematic viscosity at 40 degrees C of the present composition was measured in accordance with JIS K 2283.
  • the friction coefficient (kinematic friction coefficient) between the rubber and the metal and the friction energy were obtained using a tester shown in Fig. 4 .
  • a tester shown in Fig. 4 .
  • rubber and a Cr (chrome)-plated steel plate were reciprocatingly slid while being in pressure contact with each other at a predetermined load through a sample oil, and a Lissajous waveform was recorded.
  • Fig. 5 shows an example of the Lissajous waveform.
  • a friction coefficient ( ⁇ ) was obtained from the maximum value of a friction force.
  • An area (which is a product of an amplitude and the friction force and corresponds to workload) of the Lissajous waveform was obtained as the friction energy.
  • Lubricating oil compositions were prepared according to blending compositions shown in Tables 1 and 2. Properties and performance of each of the sample oils were evaluated in accordance with the above-described methods. The results are also shown in Tables 1 and 2.
  • the sample oils of Comparatives in which various agents such as an oiliness agent and a phosphorus extreme pressure agent are blended, cannot simultaneously satisfy all of the friction coefficient, the friction energy and the oxidation stability.
  • the sample oils in Comparatives 2, 3, 5 and 10 exhibit poor oxidation stability in spite of containing the same amount of the same antioxidant as in Examples 1 and 2.
  • the sample oil contains acid phosphate diester having an alkyl group with a relatively large number of carbon atoms.
  • the friction coefficient is large and an increase in the friction energy is hardly recognized as compared with the sample oil with only the base oil (i.e., Comparative 1 only containing the antioxidant).

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  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Lubricants (AREA)
EP15830586.2A 2014-08-06 2015-05-22 Lubricating oil composition Active EP3178911B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2014160395A JP6422260B2 (ja) 2014-08-06 2014-08-06 潤滑油組成物
PCT/JP2015/064722 WO2016021274A1 (ja) 2014-08-06 2015-05-22 潤滑油組成物

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EP3178911A1 EP3178911A1 (en) 2017-06-14
EP3178911A4 EP3178911A4 (en) 2018-02-21
EP3178911B1 true EP3178911B1 (en) 2019-10-30

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Country Status (7)

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US (1) US20170247630A1 (ko)
EP (1) EP3178911B1 (ko)
JP (1) JP6422260B2 (ko)
KR (1) KR20170032302A (ko)
CN (1) CN106536695B (ko)
ES (1) ES2763299T3 (ko)
WO (1) WO2016021274A1 (ko)

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JP7156903B2 (ja) * 2018-10-26 2022-10-19 Ｋｙｂ株式会社 潤滑油の評価方法
JP7412202B2 (ja) * 2020-02-07 2024-01-12 Ｎｏｋクリューバー株式会社 潤滑グリース組成物

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Publication number Priority date Publication date Assignee Title
JPS5289765A (en) * 1976-01-22 1977-07-27 Toshiba Corp Lubricating compound
SU958425A1 (ru) * 1981-01-05 1982-09-15 Казанский Химико-Технологический Институт Им.С.М.Кирова Циклические амидофосфиты в качестве антиокислительной присадки к сложным эфирам карбоновых кислот
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CN106536695B (zh) 2020-12-29
CN106536695A (zh) 2017-03-22
KR20170032302A (ko) 2017-03-22
US20170247630A1 (en) 2017-08-31
WO2016021274A1 (ja) 2016-02-11
JP6422260B2 (ja) 2018-11-14
EP3178911A4 (en) 2018-02-21
ES2763299T3 (es) 2020-05-28
EP3178911A1 (en) 2017-06-14
JP2016037528A (ja) 2016-03-22

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