WO2013145759A1 - 潤滑油組成物 - Google Patents
潤滑油組成物 Download PDFInfo
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- WO2013145759A1 WO2013145759A1 PCT/JP2013/002139 JP2013002139W WO2013145759A1 WO 2013145759 A1 WO2013145759 A1 WO 2013145759A1 JP 2013002139 W JP2013002139 W JP 2013002139W WO 2013145759 A1 WO2013145759 A1 WO 2013145759A1
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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
- 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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- 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
- C10M169/042—Mixtures of base-materials and additives the additives being compounds of unknown or incompletely defined constitution only
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
- C10M2203/10—Petroleum or coal fractions, e.g. tars, solvents, bitumen
- C10M2203/1006—Petroleum or coal fractions, e.g. tars, solvents, bitumen used as base material
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/26—Overbased carboxylic acid salts
- C10M2207/262—Overbased carboxylic acid salts derived from hydroxy substituted aromatic acids, e.g. salicylates
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- 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
- C10N2010/02—Groups 1 or 11
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2010/00—Metal present as such or in compounds
- C10N2010/04—Groups 2 or 12
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
- C10N2030/06—Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- 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
- C10N2030/43—Sulfur free or low sulfur content compositions
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
- C10N2030/52—Base number [TBN]
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
- C10N2030/54—Fuel economy
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2040/00—Specified use or application for which the lubricating composition is intended
- C10N2040/25—Internal-combustion engines
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2040/00—Specified use or application for which the lubricating composition is intended
- C10N2040/25—Internal-combustion engines
- C10N2040/252—Diesel engines
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2040/00—Specified use or application for which the lubricating composition is intended
- C10N2040/25—Internal-combustion engines
- C10N2040/255—Gasoline engines
Definitions
- the present invention relates to a lubricating oil composition, and more particularly, to a lubricating oil composition suitably used for applications such as a lubricating oil for an internal combustion engine.
- the lubricating oil composition for internal combustion engines often includes an organic molybdenum compound, particularly molybdenum dithiocarbamate (MoDTC), as a friction modifier (see, for example, Patent Documents 1 to 3 below).
- MoDTC molybdenum dithiocarbamate
- Patent Documents 1 to 3 below a friction modifier that replaces MoDTC is required.
- the present invention maximizes the friction reduction effect by optimizing the base oil and additives other than the friction modifier used in the lubricating oil composition, particularly the lubricating oil for internal combustion engines.
- An object of the present invention is to provide a lubricating oil composition.
- the present inventors have maximized the friction reduction effect by optimizing the sulfur content and aromatic content of the base oil and specific metal detergents.
- the present inventors have found that a lubricating oil composition can be obtained, and have completed the present invention.
- the average number of carbon atoms in the soap chain of the metal salicylate detergent (B) is 10 or more.
- the metal salicylate detergent (B) is an overbased calcium carbonate salicylate.
- the lubricating oil composition of the present invention is preferably a lubricating oil for internal combustion engines.
- the present invention is a method for improving fuel economy of an internal combustion engine using the above lubricating oil composition.
- a lubricating oil composition particularly a lubricating oil composition for an internal combustion engine, which can sufficiently reduce friction under boundary lubrication conditions and mixed lubrication conditions without a friction modifier, and is excellent in fuel efficiency. It becomes possible to do.
- the lubricating oil composition of the present invention has a sulfur content of 0.03 mass% or more, and a mass ratio of aromatic content (% C A ) to sulfur content [% C A (mass%) / sulfur content (mass%). )] Is contained in a base oil (A) of 30 or less in an amount of 3% by mass or less of the metal salicylate detergent (B) as an amount of alkali metal or alkaline earth metal based on the total amount of the composition.
- the base oil (A) of the lubricating oil composition of the present invention has a sulfur content of 0.03% by mass or more, preferably 0.1% by mass or more, and more preferably 0.2% by mass or more. Preferably, it is more preferably 0.3% by mass or more, particularly preferably 0.4% by mass or more, and most preferably 0.5% by mass or more.
- the base oil (A) preferably has a sulfur content of 1.2% by mass or less, more preferably 1% by mass or less, and even more preferably 0.8% by mass or less. It is especially preferable that it is 0.7 mass% or less.
- the sulfur content of the base oil (A) is 0.03% by mass or more, friction is reduced, and when used as a lubricating oil for an internal combustion engine, a lubricating oil composition having an excellent fuel economy effect is obtained. Can do. However, if the sulfur content of the base oil (A) exceeds 1.2% by mass, the oxidation stability of the lubricating oil composition is deteriorated and sludge is likely to be generated, which is not preferable.
- the “sulfur content” as used in the present invention means JIS K 2541-4 “radiation type excitation method” (usually in the range of 0.01 to 5 mass%) or JIS K 2541-5 “bomb type mass method, attached (Standard), inductively coupled plasma emission method "(usually 0.05% by mass or more).
- the base oil (A) of the lubricating oil composition of the present invention has an aromatic content (% C A ) and a sulfur content mass ratio [% C A (mass%) / sulfur content (mass%)] of 30 or less. , Preferably 15 or less, more preferably 12 or less, and preferably 5 or more, more preferably 7 or more.
- the% C A / sulfur content of the base oil (A) is 30 or less, the effect of reducing friction is increased, and when it is less than 5, the influence of sulfur is excessively increased, and conversely, the friction coefficient may be increased. is there.
- the range of about% C A of the base oil (A), the above-mentioned aromatic content (% C A) and a sulfur content mass ratio of [% C A (wt%) / sulfur (wt%)] If satisfied, there is no particular limitation, but from the viewpoint of oxidation stability, it is preferably 20 or less, more preferably 15 or less, and particularly preferably 10 or less.
- % C A is determined by a method in accordance with ASTM D 3238 (n-d- M ring analysis).
- the base oil (A) of the lubricating oil composition of the present invention has a sulfur content of 0.03% by mass or more, and a mass ratio of aromatic content (% C A ) to sulfur content [% C A (% by mass) / Sulfur content (mass%)] should just be 30 or less. Accordingly, the base oil (A) contains, for example, at least one mineral base oil containing sulfur as shown below, either alone or one or more of other mineral oil base oils or synthetic base oils. Can be configured.
- the mineral base oil a lubricating oil fraction obtained by distillation under reduced pressure of atmospheric residual oil obtained by atmospheric distillation of crude oil, solvent removal, solvent extraction, hydrocracking , Purified by performing one or more treatments such as solvent dewaxing, hydrorefining and the like.
- examples of base oils that hardly contain sulfur include base oils and synthetic base oils produced by a method of isomerizing wax isomerized mineral oil, GTL-WAX (gas-trimmed wax).
- the synthetic base oil examples include polybutene or hydrides thereof; poly- ⁇ -olefins such as 1-octene oligomers and 1-decene oligomers or hydrides thereof; ditridecyl glutarate, di-2-ethylhexyl.
- Diesters such as adipate, diisodecyl adipate, ditridecyl adipate, di-2-ethylhexyl sebacate; neopentyl glycol ester, trimethylolpropane caprylate, trimethylolpropane pelargonate, pentaerythritol-2-ethylhexanoate, pentaerythritol pelargo
- polyol esters such as nates
- aromatic synthetic oils such as alkylnaphthalenes, alkylbenzenes, and aromatic esters, or mixtures thereof.
- the kinematic viscosity of the base oil (A) is not particularly limited, but the kinematic viscosity at 100 ° C. is preferably 20 mm 2 / s or less, more preferably 15 mm 2 / s or less, particularly preferably 10 mm. 2 / s or less.
- the kinematic viscosity at 100 ° C. of the base oil (A) is preferably 1 mm 2 / s or more, more preferably 2 mm 2 / s or more.
- the base oil (A) exceeds 20 mm 2 / s, the low-temperature viscosity characteristics deteriorate, while when the kinematic viscosity at 100 ° C. is less than 1 mm 2 / s, Insufficient oil film formation is inferior in lubricity, and the evaporation loss of the lubricating base oil increases, which is not preferable.
- the viscosity index of the base oil (A) is not particularly limited and is usually 200 or less, but the viscosity index is preferably 80 or more so that excellent viscosity characteristics from low temperature to high temperature can be obtained. , More preferably 100 or more, and particularly preferably 120 or more. When the viscosity index of the base oil (A) is less than 80, the low temperature viscosity characteristics tend to deteriorate.
- the viscosity index of the base oil (A) is preferably 160 or less.
- the lubricating oil composition of the present invention contains a metal salicylate detergent (B).
- the metal salicylate detergent (B) is preferably a metal salicylate represented by the following general formula (1) and / or a (over) basic salt thereof.
- R 1 represents an alkyl group or an alkenyl group
- M represents an alkali metal or an alkaline earth metal, preferably calcium or magnesium, calcium is particularly preferable, and n is 1 or 2. is there.
- the metal salicylate detergent (B) is preferably an alkali metal or alkaline earth metal salicylate having one alkyl group or alkenyl group in the molecule and / or a (over) basic salt thereof. .
- the method for producing the alkali metal or alkaline earth metal salicylate is not particularly limited, and a known method for producing a monoalkyl salicylate can be used.
- phenol is used as a starting material and alkylated with olefin.
- alkali metal or alkaline earth metal can be obtained by reacting metal bases such as oxides and hydroxides of the above or by once replacing alkali metal salts such as sodium salts and potassium salts with alkaline earth metal salts. .
- the metal salicylate detergent (B) used in the lubricating oil composition of the present invention includes not only the neutral salt obtained as described above, but also these neutral salt and excess alkali metal or alkaline earth metal.
- Basic salts obtained by heating a salt, alkali metal or alkaline earth metal base (a hydroxide or oxide of an alkali metal or alkaline earth metal) in the presence of water, carbon dioxide, boric acid or boron
- overbased salts obtained by reacting a neutral salt with a base such as an alkali metal or alkaline earth metal hydroxide in the presence of an acid salt.
- the content of the metal salicylate detergent (B) is 3% by mass or less as the amount of alkali metal or alkaline earth metal based on the total amount of the composition, preferably 0.05 to 2% by mass, more preferably 0.05 to 1.5% by mass, still more preferably 0.05 to 0.8% by mass, especially 0.05 to 0.5% by mass, most preferably 0. .05-0.25%. If the content of the metal salicylate-based detergent (B) based on the total amount of the composition is less than 0.05% by mass as the amount of alkali metal or alkaline earth metal, the friction reducing effect is not sufficiently exhibited, which is not preferable. When it exceeds 3 mass%, the friction reduction effect will fall.
- the metal salicylate detergent (B) used in the lubricating oil composition of the present invention preferably has a metal ratio of usually 1.0 to 30.
- Metal salicylate detergents with a metal ratio of less than 1.0 may have acid and may be corrosive, while metal salicylate detergents with a metal ratio of 30 or more are unstable and precipitate. Since it may occur, it is not preferable.
- the metal ratio of the metal salicylate detergent (B) is represented by the valence of the metal element in the salicylate detergent x metal element content (mol%) / soap group content (mol%),
- An element means calcium, magnesium or the like, and a soap group means a salicylic acid group or the like.
- R 1 preferably has 10 to 40 carbon atoms, more preferably 14 to 30 carbon atoms, and still more preferably 20 or more carbon atoms.
- R 1 is preferably an alkyl group, more preferably a secondary alkyl group.
- the metal salicylate detergent (B) used in the lubricating oil composition of the present invention preferably has an average number of carbon atoms in the soap chain alkyl chain of 10 or more. If the carbon number of the alkyl chain of the soap group is 10 or more on average, a sufficient friction reducing effect can be obtained.
- an overbased calcium carbonate salicylate is preferable.
- the overbased calcium carbonate salicylate is obtained by overbasing a neutral calcium salicylate obtained by neutralizing a hydrocarbon group-substituted salicylic acid with an equivalent calcium base such as calcium hydroxide or calcium oxide with calcium carbonate. Is.
- the lubricating oil composition of the present invention includes a sulfonate detergent, a phenate, in order to further improve its acid neutralization properties, high temperature cleanability and wear resistance.
- Metal detergents such as a system detergent and a carboxylate detergent can be added.
- the metal detergent other than the metal salicylate detergent (B) include, for example, alkali metal sulfonate or alkaline earth metal sulfonate, alkali metal phenate or alkaline earth metal phenate, alkali metal carboxylate or alkaline earth. And the like, or a mixture thereof.
- the alkali metal or alkaline earth metal sulfonate is, for example, an alkali metal of an alkyl aromatic sulfonic acid obtained by sulfonating an alkyl aromatic compound having a molecular weight of 100 to 1500, preferably 200 to 700. Salts or alkaline earth metal salts, particularly magnesium salts and / or calcium salts are preferably used.
- alkyl aromatic sulfonic acids include so-called petroleum sulfonic acids and synthetic sulfonic acids.
- the alkali metal or alkaline earth metal phenate includes an alkylphenol having at least one linear or branched alkyl group having 4 to 30 carbon atoms, preferably 6 to 18 carbon atoms, Alkali metal salts or alkaline earth metal salts of alkylphenol sulfide obtained by reacting elemental sulfur or Mannich reaction product of alkylphenol obtained by reacting this alkylphenol with formaldehyde, particularly magnesium salt and / or calcium salt are preferably used. It is done.
- the alkali metal or alkaline earth metal carboxylate is an alkylbenzoic acid having at least one linear or branched alkyl group having 4 to 30 carbon atoms, preferably 6 to 18 carbon atoms.
- Alkali metal salts or alkaline earth metal salts, particularly magnesium salts and / or calcium salts are preferably used.
- metal detergents are usually marketed in a state diluted with a light lubricating base oil or the like, and are available, but generally the metal content is 1.0 to 20% by mass. In particular, it is desirable to use 2.0 to 16% by mass.
- the total base number of the metal detergent is usually 0 to 500 mgKOH / g, preferably 20 to 450 mgKOH / g.
- the total base number referred to here is JIS K2501 “Petroleum products and lubricating oils-Neutralization number test method”. It means the total base number measured by the perchloric acid method based on
- the lubricating oil composition of the present invention preferably further contains an ashless dispersant.
- an ashless dispersant any ashless dispersant used for lubricating oils can be used.
- at least one linear or branched alkyl group or alkenyl group having 40 to 400 carbon atoms in the molecule is used.
- examples thereof include nitrogen-containing compounds or derivatives thereof, modified products of alkenyl succinimide, benzylamine, polyamine and the like.
- One type or two or more types arbitrarily selected from these can be blended in the lubricating oil composition of the present invention.
- the alkyl group or alkenyl group of the alkenyl succinimide preferably has 40 to 400 carbon atoms, more preferably 60 to 350 carbon atoms.
- the carbon number of the alkyl group or alkenyl group is less than 40, the solubility of the compound in the lubricating base oil tends to decrease.
- the carbon number of the alkyl group or alkenyl group exceeds 400, the lubricating oil The low temperature fluidity of the composition tends to deteriorate.
- the alkyl group or alkenyl group may be linear or branched, but specific examples thereof are derived from olefin oligomers such as propylene, 1-butene and isobutylene, and ethylene and propylene co-oligomers. And a branched alkyl group or a branched alkenyl group.
- the lubricating oil composition of the present invention may contain either monotype or bis type succinimide, or may contain both.
- the method for producing succinimide is not particularly limited.
- an alkyl succinic acid or alkenyl succinic acid obtained by reacting a compound having an alkyl group or alkenyl group having 40 to 400 carbon atoms with maleic anhydride at 100 to 200 ° C. It can be obtained by reacting with a polyamine.
- the polyamine include diethylenetriamine, triethylenetetramine, tetraethylenepentamine, and pentaethylenehexamine.
- examples of the benzylamine include compounds represented by the following general formula (2).
- R 2 represents an alkyl group or alkenyl group having 40 to 400 carbon atoms, preferably 60 to 350 carbon atoms, and p represents an integer of 1 to 5, preferably 2 to 4.
- the method for producing the benzylamine is not particularly limited.
- a polyolefin such as a propylene oligomer, polybutene, and an ethylene- ⁇ -olefin copolymer is reacted with phenol to obtain an alkylphenol. It can be obtained by reacting polyamines such as diethylenetriamine, triethylenetetramine, tetraethylenepentamine, and pentaethylenehexamine by Mannich reaction.
- examples of the polyamine include compounds represented by the following general formula (3).
- R 3 —NH— (CH 2 CH 2 NH) q —H (3)
- R 3 represents an alkyl group or alkenyl group having 40 to 400 carbon atoms, preferably 60 to 350 carbon atoms, and q represents an integer of 1 to 5, preferably 2 to 4.
- the method for producing the polyamine is not particularly limited. For example, after chlorinating a polyolefin such as a propylene oligomer, polybutene, and an ethylene- ⁇ -olefin copolymer, ammonia, ethylenediamine, diethylenetriamine, triethylene is added thereto. It can be obtained by reacting polyamines such as tetramine, tetraethylenepentamine, and pentaethylenehexamine.
- the derivative of the nitrogen-containing compound mentioned as an example of the ashless dispersant include, for example, monocarboxylic acids having 1 to 30 carbon atoms (fatty acids, etc.), oxalic acid, phthalic acid, So-called acid modification in which a part or all of the remaining amino group and / or imino group is neutralized or amidated by the action of a polycarboxylic acid having 2 to 30 carbon atoms such as trimellitic acid or pyromellitic acid.
- Compound A so-called boron-modified compound obtained by allowing boric acid to act on the aforementioned nitrogen-containing compound to neutralize or amidate part or all of the remaining amino group and / or imino group; And a modified compound obtained by combining two or more kinds of modifications selected from acid modification, boron modification, and sulfur modification with the above-mentioned nitrogen-containing compound.
- boron-modified compounds of alkenyl succinimides are excellent in heat resistance and antioxidant properties, and are effective in further improving base number maintenance and high temperature cleanliness in the lubricating oil composition of the present invention.
- the content thereof is usually 0.01 to 20% by mass, preferably 0.1 to 10% by mass, based on the total amount of the lubricating oil composition. is there.
- the content of the ashless dispersant in the lubricating oil composition is less than 0.01% by mass, the effect on the base number retention at high temperatures is small.
- the content exceeds 20% by mass, the lubricating oil composition Since low temperature fluidity deteriorates significantly, each is not preferable.
- the lubricating oil composition of the present invention preferably further contains a chain termination type antioxidant.
- a chain termination type antioxidant By containing the chain termination type antioxidant, the antioxidant property of the lubricating oil composition is further improved, and therefore, the base number maintainability and the high temperature cleanability in the present invention can be further improved.
- any one generally used in lubricating oils such as phenol-based antioxidants, amine-based antioxidants, and metal-based antioxidants can be used. Further, the phenolic antioxidant and the amine antioxidant may be used in combination.
- the content of the chain-stopping antioxidant is usually 5.0% by mass or less, preferably 3.0% by mass or less, based on the total amount of the lubricating oil composition. Yes, more preferably 2.5% by mass or less.
- the content of the chain terminating antioxidant exceeds 5.0% by mass, it is not preferable because sufficient antioxidant properties corresponding to the content cannot be obtained.
- the content of the chain-stopping antioxidant is preferably 0.1% by mass or more based on the total amount of the lubricating oil composition in order to further improve the base number maintainability and the high temperature cleanability in the lubricating oil deterioration process. More preferably, it is 1% by mass or more.
- any additive generally used in lubricating oils can be added depending on the purpose.
- additives include wear inhibitors, friction modifiers, viscosity index improvers, corrosion inhibitors, rust inhibitors, demulsifiers, metal deactivators, antifoaming agents, and colorants. An agent etc. can be mentioned.
- phosphorus compounds and sulfur compounds can be used as the antiwear agent.
- a typical example of the phosphorus compound is zinc carbyl dithiophosphate, but other phosphates and phosphites containing no sulfur and metal salts thereof are also preferably used.
- sulfur compounds examples include disulfides, sulfurized olefins, sulfurized fats and oils, dithiophosphoric acid metal salts (such as zinc salts and molybdenum salts), dithiocarbamic acid metal salts (such as zinc salts and molybdenum salts), dithiophosphoric acid esters and derivatives thereof ( Reaction products with olefin cyclopentadiene, (methyl) methacrylic acid, propionic acid, etc .; in the case of propionic acid, those added to the ⁇ -position are preferred), sulfur-containing compounds such as trithiophosphates and dithiocarbamates.
- dithiophosphoric acid metal salts such as zinc salts and molybdenum salts
- dithiocarbamic acid metal salts such as zinc salts and molybdenum salts
- dithiophosphoric acid esters and derivatives thereof Reaction products with olefin cyclopentadiene, (methyl) methacrylic acid, propionic
- the content in terms of sulfur is preferably 0.1% by mass or less, and more preferably 0.05% by mass or less.
- any compound usually used as a friction modifier for lubricating oils can be used.
- molybdenum disulfide, molybdenum dithiocarbamate as long as the composition does not affect the exhaust gas treatment apparatus.
- Molybdenum friction modifiers such as molybdenum dithiophosphate and molybdenum amine complex can be used.
- an amine compound, fatty acid ester, fatty acid amide, fatty acid having at least one alkyl group or alkenyl group having 6 to 30 carbon atoms, in particular, a linear alkyl group or linear alkenyl group having 6 to 30 carbon atoms in the molecule examples also include ashless friction modifiers such as aliphatic alcohols, aliphatic ethers, hydrazides (such as oleyl hydrazide), semicarbazides, ureas, ureidos, biurets, and the like. The content of these friction modifiers is usually 0.1 to 5% by mass.
- the viscosity index improver is a so-called non-dispersed viscosity index improver such as a polymer or copolymer of one or more monomers selected from various methacrylic esters or a hydrogenated product thereof.
- a so-called dispersion type viscosity index improver obtained by copolymerization of various methacrylic acid esters containing a nitrogen compound, a non-dispersion type or a dispersion type ethylene- ⁇ -olefin copolymer (the ⁇ -olefins include propylene, 1-butene 1-pentene, etc.) or a hydride thereof, polyisobutylene or a hydrogenated product thereof, a hydride of a styrene-diene copolymer, a styrene-maleic anhydride copolymer, and a polyalkylstyrene.
- the molecular weight of the viscosity index improver is preferably selected in consideration of shear stability.
- the number average molecular weight of the viscosity index improver is usually 5,000 to 1,000,000, preferably 100,000 to 900,000 in the case of dispersed and non-dispersed polymethacrylates, for example.
- polyisobutylene or a hydride thereof usually 800 to 5,000, preferably 1,000 to 4,000, and in the case of an ethylene- ⁇ -olefin copolymer or a hydride thereof, usually 800 to 500.
- 3,000, preferably 3,000 to 200,000 are used.
- a lubricating oil composition having particularly excellent shear stability can be obtained.
- the lubricating oil composition of the present invention may contain one or two or more compounds arbitrarily selected from the above viscosity index improvers in any amount.
- the content of the viscosity index improver is usually 0.1 to 20% by mass based on the lubricating oil composition.
- corrosion inhibitor examples include benzotriazole, tolyltriazole, thiadiazole, and imidazole compounds.
- rust inhibitor examples include petroleum sulfonate, alkylbenzene sulfonate, dinonylnaphthalene sulfonate, alkenyl succinate, and polyhydric alcohol ester.
- demulsifier examples include polyalkylene glycol nonionic surfactants such as polyoxyethylene alkyl ether, polyoxyethylene alkyl phenyl ether, polyoxyethylene alkyl naphthyl ether, and the like.
- metal deactivator examples include imidazoline, pyrimidine derivatives, alkylthiadiazoles, mercaptobenzothiazoles, benzotriazoles or derivatives thereof, 1,3,4-thiadiazole polysulfide, 1,3,4-thiadiazolyl-2,5- Examples thereof include bisdialkyldithiocarbamate, 2- (alkyldithio) benzimidazole, and ⁇ - (o-carboxybenzylthio) propiononitrile.
- antifoaming agent examples include silicone, fluorosilicone, and fluoroalkyl ether.
- the content thereof is based on the total amount of the lubricating oil composition, and 0.005 to 5% by mass for each of the corrosion inhibitor, rust inhibitor and demulsifier.
- the metal deactivator is usually selected in the range of 0.005 to 1% by mass, and the antifoaming agent in the range of 0.0005 to 1% by mass.
- the friction reduction effect was measured using a TE77 reciprocating friction tester manufactured by Phoenix Tribology (where the test plate material was BS4659, the shape was 58 mm long x 38 mm wide x 4 mm thick).
- the material of the test cylinder pin is EN1A, the shape is 6 mm in diameter ⁇ 16 mm in length), the stroke is 15 mm, 20 Hz, the oil temperature is 150 ° C., and the load is 300 N for 30 minutes, the stroke is 15 mm, 1 Hz, Evaluation was made by measuring the friction coefficient at an oil temperature of 150 ° C. and a load of 200 N.
- Table 1 shows the properties of the base oils used in the examples and comparative examples
- Table 2 shows the characteristics of the metal salicylate detergents used in the examples and comparative examples.
- the amount of base oil is the content in the base oil
- the amount of salicylate is the content based on the total amount of the composition.
- Example 1 to 6 and Comparative Examples 1 and 2 A lubricating oil composition having the composition shown in Table 3 was prepared, and the coefficient of friction was measured.
- Table 3 shows the influence of the sulfur content of the base oil according to Examples 1 to 6 and Comparative Examples 1 and 2. From Table 3, it can be seen that when the sulfur content of the base oil is 0.03% by mass or more, the friction coefficient becomes small.
- Examples 3, 7, 8 and Comparative Example 3 A lubricating oil composition having the composition shown in Table 4 was prepared, and the coefficient of friction was measured.
- Table 4 shows the influence of the ratio of the aromatic content (% C A ) and the sulfur content (S) of the base oil according to Examples 3, 7, 8 and Comparative Example 3. From Table 4, it can be seen that when the% C A / S of the base oil is 30 or less, the friction coefficient becomes small.
- Table 5 shows the influence of the calcium content of the lubricating oil composition in Examples 6, 9, and 10 and Comparative Examples 1 and 4 to 7. From Examples 6, 9, 10 and Comparative Example 4 in Table 5, it can be seen that when the sulfur content of the base oil is 0.03% by mass or more, the smaller the amount of calcium in the lubricating oil composition, the lower the friction coefficient.
- Example 6 A lubricating oil composition having the composition shown in Table 6 was prepared, and the coefficient of friction was measured.
- Table 6 shows the influence of the alkyl chain length of the metal salicylate detergent (B) according to Examples 6 and 11. From Table 6, it can be seen that the longer the alkyl chain length of the metal salicylate detergent (B), the higher the friction reducing effect.
- the lubricating oil composition of the present invention can be used as a general lubricating oil, but is preferably used for gasoline engines, diesel engines, gas engines, etc. for motorcycles, automobiles, power generation, cogeneration, etc. It is also useful for various engines for ships and outboard motors.
- the lubricating composition of the present invention comprises a lubricating oil that requires a reduction in friction, for example, a lubricating oil for a drive system such as an automatic or manual transmission, grease, wet brake oil, hydraulic hydraulic oil, turbine oil, It can also be suitably used as a lubricating oil such as compressor oil, bearing oil, and refrigerator oil.
- a lubricating oil for a drive system such as an automatic or manual transmission, grease, wet brake oil, hydraulic hydraulic oil, turbine oil
- a lubricating oil such as compressor oil, bearing oil, and refrigerator oil.
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Lubricants (AREA)
Abstract
Description
硫黄分が0.03質量%以上であり、芳香族分(%CA)と硫黄分との質量比[%CA(質量%)/硫黄分(質量%)]が30以下である基油(A)に、
金属サリシレート系清浄剤(B)を組成物全量基準で、アルカリ金属又はアルカリ土類金属量として3質量%以下含有する
潤滑油組成物である。
R3-NH-(CH2CH2NH)q-H ・・・(3)
表3に示す配合の潤滑油組成物を調製し、摩擦係数を測定した。
表4に示す配合の潤滑油組成物を調製し、摩擦係数を測定した。
表5に示す配合の潤滑油組成物を調製し、摩擦係数を測定した。
表6に示す配合の潤滑油組成物を調製し、摩擦係数を測定した。
Claims (5)
- 硫黄分が0.03質量%以上であり、芳香族分(%CA)と硫黄分との質量比[%CA(質量%)/硫黄分(質量%)]が30以下である基油(A)に、
金属サリシレート系清浄剤(B)を組成物全量基準で、アルカリ金属又はアルカリ土類金属量として3質量%以下含有する潤滑油組成物。 - 前記金属サリシレート系清浄剤(B)の石けん基のアルキル鎖の炭素数が平均10以上であることを特徴とする、請求項1に記載の潤滑油組成物。
- 前記金属サリシレート系清浄剤(B)が過塩基性炭酸カルシウムサリシレートであることを特徴とする、請求項1又は2に記載の潤滑油組成物。
- 内燃機関用潤滑油であることを特徴とする、請求項1~3のいずれか一項に記載の潤滑油組成物。
- 請求項1~3のいずれか一項に記載の潤滑油組成物を使用して、内燃機関の省燃費性を向上させる方法。
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EP13770254.4A EP2832840A4 (en) | 2012-03-30 | 2013-03-28 | OIL COMPOSITION |
CN201380018039.XA CN104334700A (zh) | 2012-03-30 | 2013-03-28 | 润滑油组合物 |
IN8187DEN2014 IN2014DN08187A (ja) | 2012-03-30 | 2013-03-28 | |
KR20147030405A KR20150003774A (ko) | 2012-03-30 | 2013-03-28 | 윤활유 조성물 |
SG11201406197QA SG11201406197QA (en) | 2012-03-30 | 2013-03-28 | Lubricant oil composition |
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JP2012081873A JP2013209569A (ja) | 2012-03-30 | 2012-03-30 | 潤滑油組成物 |
JP2012-081873 | 2012-03-30 |
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EP (1) | EP2832840A4 (ja) |
JP (1) | JP2013209569A (ja) |
KR (1) | KR20150003774A (ja) |
CN (1) | CN104334700A (ja) |
IN (1) | IN2014DN08187A (ja) |
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Cited By (1)
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US10155915B2 (en) | 2015-03-31 | 2018-12-18 | Idemitsu Kosan Co., Ltd. | Lubricating oil composition and method for reducing friction in internal combustion engines |
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FR3109942B1 (fr) * | 2020-05-05 | 2022-08-19 | Total Marketing Services | Composition lubrifiante pour vehicules electriques |
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IN2014DN08187A (ja) | 2015-05-01 |
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JP2013209569A (ja) | 2013-10-10 |
KR20150003774A (ko) | 2015-01-09 |
CN104334700A (zh) | 2015-02-04 |
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