WO2016129465A1 - Lubricating oil composition for internal combustion engine - Google Patents

Lubricating oil composition for internal combustion engine Download PDF

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Publication number
WO2016129465A1
WO2016129465A1 PCT/JP2016/053162 JP2016053162W WO2016129465A1 WO 2016129465 A1 WO2016129465 A1 WO 2016129465A1 JP 2016053162 W JP2016053162 W JP 2016053162W WO 2016129465 A1 WO2016129465 A1 WO 2016129465A1
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preferably
less
lubricating oil
group
internal combustion
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PCT/JP2016/053162
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French (fr)
Japanese (ja)
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慎太郎 楠原
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Jxエネルギー株式会社
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    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10MLUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M169/00Lubricating 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
    • C10M169/04Mixtures of base-materials and additives
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    • C10M105/00Lubricating compositions characterised by the base-material being a non-macromolecular organic compound
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    • C10M133/00Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing nitrogen
    • C10M133/02Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing nitrogen having a carbon chain of less than 30 atoms
    • C10M133/04Amines, e.g. polyalkylene polyamines; Quaternary amines
    • C10M133/06Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to acyclic or cycloaliphatic carbon atoms
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    • C10M139/00Lubricating 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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    • C10M141/00Lubricating 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
    • C10M141/12Lubricating 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 compound containing atoms of elements not provided for in groups C10M141/02 - C10M141/10
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    • C10M163/00Lubricating 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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    • C10M137/00Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing phosphorus
    • C10M137/02Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing phosphorus having no phosphorus-to-carbon bond
    • C10M137/04Phosphate esters
    • C10M137/10Thio derivatives
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    • C10M159/00Lubricating compositions characterised by the additive being of unknown or incompletely defined constitution
    • C10M159/12Reaction products
    • C10M159/20Reaction mixtures having an excess of neutralising base, e.g. so-called overbasic or highly basic products
    • C10M159/22Reaction mixtures having an excess of neutralising base, e.g. so-called overbasic or highly basic products containing phenol radicals
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    • C10M2203/00Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
    • C10M2203/10Petroleum or coal fractions, e.g. tars, solvents, bitumen
    • C10M2203/102Aliphatic fractions
    • C10M2203/1025Aliphatic fractions used as base material
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    • C10M2205/00Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
    • C10M2205/003Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions used as base material
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    • C10M2207/00Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/26Overbased carboxylic acid salts
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    • C10M2209/02Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M2209/08Macromolecular 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
    • C10M2209/084Acrylate; Methacrylate
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    • C10M2215/00Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2215/02Amines, e.g. polyalkylene polyamines; Quaternary amines
    • C10M2215/04Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to acyclic or cycloaliphatic carbon atoms
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    • C10M2219/00Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
    • C10M2219/06Thio-acids; Thiocyanates; Derivatives thereof
    • C10M2219/062Thio-acids; Thiocyanates; Derivatives thereof having carbon-to-sulfur double bonds
    • C10M2219/066Thiocarbamic type compounds
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    • C10M2223/00Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions
    • C10M2223/02Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions having no phosphorus-to-carbon bonds
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    • C10M2223/045Metal containing thio derivatives
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    • C10N2210/00Nature of the metal present as such or in compounds, i.e. in salts
    • C10N2210/02Group II, e.g. Mg, Ca, Ba, Zn, Cd, Hg
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Abstract

The present invention provides a lubricating oil composition for internal combustion engines that has excellent fuel-saving performance by further reducing friction. The lubricating oil composition for internal combustion engines contains, in (A) a lubricant base oil with a dynamic viscosity at 100°C of 2.0-5.0 mm2/s, (B) a molybdenum friction modifier in an amount of 0.005-0.2 mass% in terms of molybdenum content relative to the total amount of the composition, (C) a salicylate metal cleaning agent in an amount of 0.01-1 mass% in terms of metal content relative to the total amount of the composition, and (D) at least one compound selected from amino acids with a C15 to C24 alkyl group, alkenyl group or acyl group and/or derivatives thereof in an amount of 0.01-10 mass%.

Description

Lubricating oil composition for an internal combustion engine

The present invention relates to a lubricating oil composition for internal combustion engines with improved fuel economy.

Low fuel consumption of a motor vehicle began to be performed in response to the oil crisis, from the viewpoint of resource conservation and environmental protection is one of the still important issues, the demand has become increasingly in recent years. Improved fuel economy of automobiles lighter vehicle weight, improved combustion of the engine, and has been performed by the low friction of the engine and drive train. The low friction of the engine, improvements in valve train mechanism, the surface roughness of the sliding member decrease, and the like used in the fuel-efficient lubricating oil composition (engine oil).
Among these, the use of fuel-efficient engine oil is because it is cost-effective, becoming more common even in the market. The low fuel consumption measures by the engine oil has low viscosity is considered intended to reduce the friction losses in the fluid lubrication conditions such as a piston system or a bearing portion, also, mixed lubrication and under boundary lubrication under such valve system the addition of friction reducing agents have been proposed, such as organic molybdenum compound intended to reduce the friction loss in the.
Such fuel-saving engine oil, for example, Patent Document 1, in kinematic viscosity 2 ~ 8mm 2 / s at 100 ° C., the aromatic content of 15 wt% of the base oil to a specific additive ( alkaline earth metal salicylate detergent, the engine oil composition to a specific amount containing molybdenum dithiocarbamate friction modifier, etc.), Patent Document 2, a kinematic viscosity at 100 ° C. is 3 ~ 8 mm 2 / s a lubricating base oil containing an ester based lubricating oil base oil, molybdenum-based friction modifier or an ester-based or amine-based ashless friction modifier and overbased Ca salicylate internal combustion engine lubricating oil composition containing the but further, Patent Document 3, combine ashless friction modifiers such as sulfurized oxymolybdenum dithiocarbamate and acid amide compound and the aliphatic moiety ester compound and / or an aliphatic amine compound Was internal combustion engine lubricating oil composition formulated has been proposed.

However, molybdenum-based friction modifiers, increasing the amount, there is a limit to the friction reducing effect, also has problems such as precipitation becomes unstable occurs, further ester or amine It is used in combination with ashless friction modifier, further improvement of friction reduction effect was hardly observed. Moreover, recently, fuel economy required of the lubricating oil has become higher and higher, in the conventional engine oil not yet sufficient fuel saving properties can be obtained.
On the other hand, sarcosine or aspartic acid derivatives are known as ashless friction modifiers (e.g., Patent Documents 4-6), also be compounded in the lubricating oil composition for internal combustion engines, in combination with molybdenum-based friction modifier also not known that a synergistic effect of friction reduction by those skilled in the art were not able to predict the function and effect.

JP-8-302378 discloses JP 2005-41998 JP JP 2008-106199 JP JP-9-316475 discloses JP 2008-179669 JP JP 2005-290181 JP

The present invention is intended to solve the above problems, an object of the present invention is to provide, achieving further friction reducing is to provide an internal combustion engine lubricating oil composition excellent in fuel saving performance.

The present inventors have result of intensive studies in order to solve the above problems, the lubricating base oil (A) a kinematic viscosity at 100 ° C. is 2.0 ~ 5.0mm 2 / s, ( B) a molybdenum-based friction modifier, (C) salicylate metallic detergent and (D) an alkyl group or an alkenyl group respectively predetermined amounts amino acids and / or one or more compounds selected from derivatives having an acyl group of 15-24 carbon atoms the internal combustion engine lubricating oil compositions containing, additional friction reduction and fuel economy performance is found that can be achieved.

The present invention has been made based on these findings, as follows.
[1] (A) a kinematic viscosity at 100 ° C. is 2.0 ~ 5.0 mm 2 / s lubricating base oil, from 0.005 to as the amount of molybdenum in the total amount of the composition (B) a molybdenum-based friction modifier 0.2 wt%, (C) a salicylate metallic alkyl or alkenyl of from 0.01 to 1% by weight and (D) carbon atoms 15-24 metal weight detergent in the total amount of the composition of the acyl group amino acids and / or one or more compounds lubricating oil composition for an internal combustion engine containing 0.01 to 10 wt% selected from derivatives having.
[2] The (C) salicylate metallic detergent, an internal combustion engine lubricating oil composition according to the above [1] is a salicylate metallic detergent containing boron.
[3] the HTHS viscosity of 1.9 ~ 2.7 mPa / s at 0.99 ° C. [1] or an internal combustion engine lubricating oil composition according to [2].
[4] the [1] HTHS viscosity of 1.9 ~ 2.4 mPa / s at 0.99 ° C. ~ lubricating oil composition according to any one of [3].
[5] above [1] NOACK evaporation amount is not more than 15% by mass to an internal combustion engine lubricating oil composition according to any one of [4].
[6] (E) a zinc dialkyldithiophosphate wear inhibitor based on the total amount of the composition, the phosphorus amount, according to any one of the above [1] to [5], 0.02 to 0.20 mass% the lubricating oil composition for internal combustion engines.

Internal combustion engine lubricating oil composition of the present invention, low coefficient of friction, a marked effect of excellent fuel efficiency performance.

The lubricant base oil in (A) the lubricating base oil present invention, if the lubricating base oil of kinematic viscosity 2.0 ~ 5.0mm 2 / s at 100 ° C., but the present invention is not particularly limited, usually as long as the used as lubricating base oil of the internal combustion engine lubricating oil composition can be used both mineral and synthetic oils.
Kinematic viscosity at 100 ° C. of the lubricating base oil, 2.5 mm 2 / s or more, more preferably 3.0 mm 2 / s or higher, more preferably 3.5 mm 2 / s or more, particularly preferably 3.8mm 2 / s or greater, most preferably 4.0 mm 2 / s or greater. Also, preferably not more than 4.5 mm 2 / s, more preferably not more than 4.3 mm 2 / s.
If the kinematic viscosity at 100 ° C. of less than 2.0 mm 2 / s, poor lubricity because the oil film formation becomes insufficient at lubricating sites and evaporation loss of the lubricating base oil is increased. On the other hand, the fuel-saving effect exceeds 5.0 mm 2 / s is reduced, also the low-temperature viscosity characteristics are deteriorated.
In the present invention, the kinematic viscosity at 100 ° C., a kinematic viscosity at 100 ° C., which is measured according to ASTM D-445.

Preferably the kinematic viscosity at 40 ° C. of the lubricating base oil in the present invention is 14 mm 2 / s or more, more preferably 16 mm 2 / s or more, even more preferably 18 mm 2 / s or more, preferably and a 25 mm 2 / s or less, more preferably 23 mm 2 / s or less, more preferably 22 mm 2 / s or less, more preferably 21 mm 2 / s or less, particularly preferably not more than 20 mm 2 / s. The kinematic viscosity at 40 ° C. referred herein indicates a kinematic viscosity at 40 ° C. which is measured according to ASTM D-445. By the kinematic viscosity at 40 ° C. or less 25 mm 2 / s, it is possible to obtain a good low temperature viscosity characteristics, also it is possible to obtain sufficient fuel savings, lubrication by a 14 mm 2 / s or more oil film formation at places good lubricity becomes sufficient can be obtained and it is possible to reduce the evaporation loss of the lubricating oil composition.

The lubricating base oil of the present invention preferably has a viscosity index of 120 or more, still more preferably 125 or more, more preferably 130 or more, and particularly preferably 132 or more. Excellent viscosity characteristics from low to high temperatures by the viscosity index of the lubricating base oil with more than 120 can be obtained and can be a low viscosity to obtain an evaporation hardly lubricating oil composition. No particular limitation is imposed on the upper limit of the viscosity index, normal paraffins, slack waxes or GTL waxes, or of about 125 to 180 such as these the isomerized isoparaffinic mineral oils, or complex ester base oil and HVI-PAO it can also be used of about 150 to 250, such as a system base oil. However, normal paraffins, slack waxes or GTL waxes, or for them isomerized isoparaffinic mineral oils, to improve the low-temperature viscosity characteristic preferably 180 or less, more preferably 170 or less, still more preferably 160 or less, particularly preferably 155 or less. In the present invention, the viscosity index, means a measured viscosity index in conformity with JIS K2283-1993.

The pour point of the lubricating base oil of the present embodiment is preferably -10 ° C. or less, more preferably -12.5 ° C. or less, more preferably -15 ° C. or less, particularly preferably -17 ° C. or less. By the pour point and -10 ° C. or less, there is a tendency that the low-temperature flow properties of lubricating oils employing the lubricating base oil is improved. Incidentally, the pour point referred to in the present invention means the pour point measured in conformity with JIS K 2269-1987.

Lubricant base oil in the present invention, as long as conditions are satisfied in the lubricating base oil of the above, in addition to it is possible to use a mineral base oil or synthetic base oil alone, or two or more mineral base oils, or no harm in a mixture of two or more synthetic base oils, no problem even if a mixture of synthetic base oil and mineral base oil. Then, the mixing ratio of two or more base oil in the mixture can be arbitrarily selected.
The mineral base oil, the lubricating oil fractions obtained by atmospheric distillation and vacuum distillation of crude oil, solvent deasphalting, solvent extraction, hydrocracking, solvent dewaxing, catalytic dewaxing, hydrorefining, sulfuric acid washing and clay treatment, etc. paraffinic purification treatment such as purification in appropriate combination of the lubricant base oil of naphthenic like.

As synthetic base oils, poly -α- olefin (e.g., polybutene, 1-octene oligomer, 1-decene oligomer, ethylene - propylene oligomer) or a hydride, isobutene oligomers or hydrogenated products thereof, isoparaffins, alkylbenzenes, copolymerizing naphthalene, diesters (e.g., dibutyl maleate, ditridecyl glutarate, di-2-ethylhexyl adipate, diisodecyl adipate, ditridecyl adipate, di-2-ethylhexyl sebacate, etc.), the α- olefins and diesters coalescence, polyol esters (such as trimethylolpropane caprylate, trimethylolpropane pelargonate, pentaerythritol-2-ethyl hexanoate, pentaerythritol pelargonate Sulfonate, etc.), dialkyl ethers, polyphenyl ether and the like.

Lubricating base oil of the invention, in the mineral base oil, the base oil saturated hydrocarbon fraction is 90% or more is preferable. In the present invention, the saturated hydrocarbon content refers to a value measured by ASTM D-2007.
Also, the base oil, API (American Petroleum Institute) those classified above group III by classification based on base oil classification, and the like waxes isomerized base oil is preferable.
A method for producing the base oil is not particularly limited, the atmospheric residue oil obtained by atmospheric distillation of crude oil, desulfurization, hydrogenolysis, fractionated to set viscosity grade, or a residual oil the solvent dewaxing or contact dewaxing, further if necessary, solvent extraction, hydrogenation, it is preferable that the base oil. Base oils obtained by inter alia catalytic dewaxing is preferred.

The aforementioned lubricant base oil, also in recent years, and further distilled under reduced pressure atmospheric Tomezan'yu, after fractionating the viscosity grade required, solvent refining, through a process such as hydrorefining, and solvent dewaxing in the base oil manufacturing process of manufacturing, by-gender in dewaxing processes, GTL wAX (gas petroleum wax, and petroleum wax isomerized lubricant base oil obtained by hydroisomerisation, manufactured by Fischer-Tropsch process or the like to liquid wax) and GTL wax isomerized lubricant base oil is manufactured by a method of isomerizing the like are also included. The basic production process of the wax isomerized lubricant base oil in this case is the same as the manufacturing method of the hydrocracked base oils.

While% C P is not particularly limited in the base oil, preferably 80 or more, more preferably 82 or more, more preferably 85 or more, particularly preferably 86 or more. Further, preferably 98 or less, more preferably 95 or less, particularly preferably 90 or less, and most preferably 88 or less. By the% C P of the lubricating base oil with more than 80, the viscosity - tends to temperature characteristics, thermal and oxidation stability and frictional properties will be improved, further, additives to the lubricating base oil is blended If the efficacy of additives will tend to be improved to. Further, by making the% C P of the lubricating base oil and 98 or less, tends to solubility of additives is improved.

While% C N is not particularly limited in the base oil, preferably 20 or less, more preferably 15 or less, more preferably 14 or less. Further, it is preferably 3 or more, more preferably 8 or more, particularly preferably 10 or more. The% C N of the lubricating base oil by 20 or less, the viscosity - temperature characteristic, heat and oxidation stability and frictional properties will tend to be improved. Further, with the 3 or more% C N, tends to solubility of additives is improved.

The% C A of the base oil is not particularly limited, is preferably less than 3, more preferably 2 or less, even more preferably 1 or less, and most preferably substantially zero. If more than 10 improvement purposes is one heat-resistant of the present invention becomes insufficient.
Note that the% C A means a value measured by a method in accordance with ASTM D3238-85 (n-d-M ring analysis).

Saturates the base oil is preferably 80 or more, more preferably 90 or more, more preferably 95 or more, particularly preferably 98 or more, most preferably 99 or more. By the saturated component and 80 above, the viscosity - temperature characteristics tend to heat and oxidation stability and frictional properties will be improved, further, of the additive if the additive is blended into a lubricating base oil there is a tendency that the effect is improved.

Further, the sulfur content of the base oil is not particularly limited but is preferably 0.03 mass% or less, more preferably 0.01 mass% or less, also, those substantially free of sulfur, particularly preferred. The sulfur content means a higher purity the less, the solubility of sludge problem would hardly occur.
There is no particular limitation on the sulfur content of the measuring method, JIS K2541-1996 and the like are generally used.

Is not particularly limited evaporation loss of the base oil is preferably 25 mass% or less in NOACK evaporation amount, more preferably at most 21 mass%, further preferably 18 wt% or less, more preferably 16 or less wt%, particularly preferably 15 mass% or less, and most preferably not more than 14 wt%. NOACK evaporation loss of the lubricating base oil by more than 25% by mass, the evaporation loss of the lubricating oil is small, preferable since it is possible to suppress the cause of such increase viscosity. Herein, the term NOACK evaporation loss and is a measure of the evaporation amount of the lubricating oil measured according to ASTM D 5800.

The molybdenum-based friction modifier in (B) a molybdenum-based friction modifier present invention, for example, be mentioned organic molybdenum-based friction modifier containing sulfur such as molybdenum dithiocarbamate (MoDTC) and molybdenum dithiophosphate (MoDTP) it can. The molybdenum dithiocarbamate, specifically there can be mentioned compounds represented by the following general formula (1). As the molybdenum dithiophosphate, and specifically it may be exemplified a compound represented by the following general formula (2).

Figure JPOXMLDOC01-appb-C000001

Figure JPOXMLDOC01-appb-C000002

Formula (1), in (2), R 1 ~ R 8 are each independently a hydrocarbon group of 1 to 24 carbon atoms, a, b, c, d are each independently 0-4 in either, and exhibit a + b = 4, c + d = an integer is four.

Formula (1), (2) Preferred examples of the hydrocarbon group having 1 to 24 carbon atoms represented by R 1 ~ R 8 is the respective individual linear or branched 1 to 24 carbon atoms alkyl group, a cycloalkyl group or a linear or branched alkyl cycloalkyl group having 5 to 13 carbon atoms, straight-chain or branched alkenyl group having 3 to 24 carbon atoms, aryl having 6 to 18 carbon atoms group or a linear or branched alkylaryl group, and an aryl alkyl group having 7 to 19 carbon atoms. The alkyl group or alkenyl group, even primary, even secondary, may be a tertiary.

The molybdenum-based friction modifier in the lubricating oil composition of the present invention, in addition to the above, for example, basic nitrogen compounds such as succinimide, a three sulfur acidic molybdenum compound and the like as hydrogen sulfide and phosphorus pentasulfide in the molybdenum oxide and the like organomolybdenum complexes is the reaction product of a compound are also described as preferable examples.

In the lubricating oil composition of the present invention, the content of molybdenum-based friction modifiers, the total amount of the composition, as elemental molybdenum in terms of weight, 0.005% by mass or more, more preferably not less than 0.01 wt%, more preferably not more than 0.03 mass%, particularly preferably not less than 0.05 wt%, 0.2 wt% or less, preferably 0.1 wt%. The content of molybdenum-based friction modifiers, if less than 0.005% by mass of molybdenum in terms of element amount, not obtained outstanding fuel economy effect, whereas, the content of molybdenum-based friction modifiers, molybdenum element If in terms of the amount of more than 0.2 mass% is not obtained to improve the fuel economy effects of commensurate to content, which is undesirable.

In the lubricating oil composition of the present invention, molybdenum-based organic molybdenum-based friction modifier containing sulfur it is preferably used as a friction modifier, among others molybdenum dithiophosphate, Molybdenum dithiocarbamate is preferably used, with other components because it can significantly improve the crossover fuel saving performance from a low temperature to a high temperature due to a synergistic effect, particularly preferably a molybdenum dithiocarbamate.

(C) Examples of salicylate-based metallic detergent referred to salicylate metallic detergents present invention, any compound usually used for lubricating oil may be used, for example, linear or branched hydrocarbon radical the a, it is possible to use more overbased oil-soluble compound metal salt having an OH group and / or carbonyl group. The overbased metal salt of an alkaline earth metal salicylate, alkaline earth metal hydroxide or oxide, the use of the overbased metal salt may be obtained by reacting boric acid or boric acid anhydride as required can. The salicylate metallic detergents, salicylate metallic detergents containing boron is particularly preferred. Examples of the alkaline earth metals, magnesium, calcium, and barium, calcium is preferred. The overbased metal salts, it is preferable to use an oil-soluble metal salt of a compound containing an alkaline earth metal borate or alkaline earth metal carbonate overbased OH group and / or carbonyl groups . In particular, from the viewpoint of excellent fuel economy, it is preferable to use an alkaline earth metal salicylate, it is more preferable to use overbased alkaline earth metal salicylate with an alkaline earth metal borate.

Salicylate metallic detergents referred to in the present invention preferably has a base number is 50 mg KOH / g or more, more preferably 100 mg KOH / g or more, still more preferably 120 mgKOH / g or more, 140 mg KOH / g by particularly preferably more. Also, preferably at most 300 mgKOH / g, more preferably at most 200 mg KOH / g. Base number in the case of less than 50 mg KOH / g, together with fuel economy by increase in viscosity increases to deteriorate, there is a tendency that the friction reducing effect by the addition is insufficient. Further, base number if more than 300 mgKOH / g, it tends to be inhibited effects such as antiwear agents, also tend to friction reducing effect becomes insufficient. Base number referred to in the present invention is a value measured by JIS K 2501 5.2.3.

Preparation of salicylate metallic detergents for use in the present invention is arbitrary, for example, the oil-soluble metal salts, alkaline earth metal hydroxide or oxide, boric acid or boric acid anhydride as required, water, methanol, ethanol, propanol, alcohol and benzene, such as butanol, toluene, allowed to react for 2 to 8 hours at 20 ~ 200 ° C. in the presence of a diluent such as xylene, followed by heating to 100 ~ 200 ° C. water and needs obtained by removing the alcohol and diluting solvent depending. These detailed reaction conditions, the raw material is appropriately selected depending on the amounts of reactants. The details of the preparation, for example, JP 60-116688 discloses, this is described in JP-A-61-204298. For total base number of oil-soluble metal salt is overbased by the manufacturing alkaline earth metal borate in the above way is usually 100 mg KOH / g or more can be preferably used in the lubricating oil composition of the present invention .

Salicylate metallic detergents referred to in the present invention preferably has a metal ratio of 4.0 or less, more preferably 3.0 or less, more preferably 2.0 or less. Incidentally, there is a possibility that the reduction i.e. fuel saving properties of the friction torque metal ratio exceeds 4.0 is insufficient. It is preferable that the metal ratio is 1.0 or more, more preferably 1.1 or more, more preferably metallic detergent comprising been adjusted to 1.5 or more. Metal ratio is likely a problem with fuel saving properties and startability for kinematic viscosity and low temperature viscosity increases of the internal combustion engine lubricating oil composition resulting is less than 1.0.
Note that the metal ratio referred to in the present invention, the valence × metal element content of the metal element in the metallic detergent (mol%) / soap group content expressed in (mol%), the metal element, calcium, magnesium, and the like, and the soap group means a sulfonic acid group, phenol group, a salicylic acid group or the like.

A linear or branched hydrocarbon group of salicylate metal detergents in the present invention is preferably an alkyl group or an alkenyl group, such alkyl group or alkenyl group, having 8 or more carbon atoms, and more preferably 10 or more, more preferably 12 or more, also 19 or less. In less than 8 carbon atoms it is not preferred because oil solubility is not sufficient. Further, it may be linear or branched but is preferably linear, they primary alkyl or alkenyl group or a secondary alkyl group or alkenyl group or a tertiary alkyl group or alkenyl group, but secondary the alkyl or alkenyl group or a tertiary alkyl group or an alkenyl group, the position of the branches that of only carbon bonded to the aromatic is preferred.

The content of salicylate metallic detergents referred to in the present invention, based on the total amount of the lubricating oil composition, in terms of metal elements, 0.01 wt% or more, preferably 0.05 wt% or more, more preferably 0. 1 mass% or more, particularly preferably not less than 0.15 wt%, also 1 wt% or less, preferably 0.5 wt% or less, more preferably 0.4 wt% or less, more preferably 0.3 mass % or less, particularly preferably 0.25 wt% or less, and most preferably not more than 0.2 mass%. If the content is less than 0.01 wt%, there is a tendency that the friction reducing effect by the addition is insufficient, fuel saving properties of lubricating oil compositions, heat and oxidation stability and detergency are insufficient There is a tendency. On the other hand, if the content exceeds 1 mass%, there is a tendency that the friction reducing effect by the addition is insufficient, fuel saving properties of lubricating oil composition tends to be insufficient.

The content of boron in the lubricating oil composition in the case of using the salicylate metallic detergents containing boron as salicylate metallic detergent, based on the total amount of the lubricating oil composition, in terms of boron element, preferably 0.01 mass% or more, more preferably 0.02 mass% or more, more preferably 0.03 mass% or more, particularly preferably not less than 0.04 mass%, also preferably 0.2% by mass or less , more preferably 0.1 wt% or less, more preferably 0.09 wt% or less, particularly preferably 0.08% by mass or less. By the content of 0.001 mass% or more, there is a tendency that the friction reducing effect by the addition is sufficient, fuel saving properties of the lubricating oil composition, thermal and oxidation stability and detergency is sufficient There is a tendency. On the other hand, when the content 0.2% by mass or less, there is a tendency that the friction reducing effect by the addition is sufficient, there is a tendency that fuel saving properties of lubricating oil composition is sufficient.

In the present invention (D) ashless friction modifier, as ashless friction modifier, containing at least one or more amino acids and / or derivatives thereof having an alkyl or alkenyl group or an acyl group having 15-24 carbon atoms but it is, for example, as the compound include the compounds shown in the following general formula (3).

Figure JPOXMLDOC01-appb-C000003

Where the alkyl or alkenyl of R 9 is having 15 to 24 carbon atoms is an acyl group, R 10 is an alkyl group or hydrogen having 1 to 4 carbon atoms, R 11 is C 1-10 hydrogen or carbon is an alkyl group. The alkyl group may be one containing a linear or branched chain or cyclic structures, carbon atoms may be substituted with a hetero atom, a hydroxyl group, a carboxyl group, be modified with a functional group such as amino group good. R 12 is an alkyl group or hydrogen having 1 to 4 carbon atoms, n is 0 or 1, X is a metal salt or ethanolamine hydrocarbons and the functional group having a functional group or the functional group having an active hydrogen salt or methoxy group.

Incidentally, R 9 of the general formula (3), solubility in the base oil, low friction, from the viewpoint of fuel economy, an alkyl group or an alkenyl group having 16 or more carbon atoms is more preferably an acyl group, a carbon the number 17 or more alkyl or alkenyl group is more preferably an acyl group, an alkyl group or an alkenyl group having 18 or more carbon atoms of the acyl group is particularly preferable. Further, in view of storage stability, preferably the number 23 or less carbon atoms, more preferably 20 or less, particularly preferably the number 19 or less carbon atoms, 18 and most preferably carbon atoms. Further it is preferable in view of the friction reducing effect is linear. Examples of such alkyl groups and alkenyl groups, and acyl groups, specifically, for example, pentadecyl group, hexadecyl group, heptadecyl group, octadecyl group, nonadecyl group, eicosyl group, heneicosyl group, docosyl group, tricosyl group, tetracosyl group alkyl group such (or in the alkyl groups and straight-chain or branched), pentadecenyl, hexadecenyl, heptadecenyl, octadecenyl, nonadecenyl, icosenyl, heneicosenyl group, docosenyl, tricosenyl group, tetracosenyl group include alkenyl groups (these alkenyl groups may be branched be linear, also the position of the double bond is also arbitrary), an acyl group having a terminal to the ketone group of the alkyl or alkenyl group .

R 10 in the general formula (3), from the viewpoint of storage stability, more preferably an alkyl group having 4 or less carbon atoms, more preferably 3 or less carbon atoms, particularly preferably having 2 or less carbon atoms.
Alkyl group for R 11 may be those containing a linear or branched chain or cyclic structures, carbon atoms may be substituted with a hetero atom, a hydroxyl group, a carboxyl group, have been modified with a functional group such as an amino group it may be. From the viewpoint of solubility in friction reducing effect and the base oil, more preferably an alkyl group having 2 or less carbon atoms, the number 1 is more preferably less carbon atoms, hydrogen being particularly preferred.
R 12 is, in view of storage stability, more preferably an alkyl group having 4 or less carbon atoms, more preferably 3 or less carbon atoms, particularly preferably having 2 or less carbon atoms, most preferably hydrogen.

Examples of the functional group having X active hydrogen in the general formula (3), a hydroxyl group, an amino group is preferred. Primary and secondary amines are preferred as the amino group, in particular a primary amine is preferred. As the metal salt of the active hydrogen group include metal salts of hydroxyl groups. Among them -COX the general formula (3), a carboxyl group is preferred.
The hydrocarbon having a hydroxyl group is a functional group having an active hydrogen, specifically, for example, ethylene glycol, propylene glycol, 1,4-butanediol, 1,2-butanediol, neopentyl glycol, 1,6 - hexanediol, 1,2-octanediol, 1,8-octanediol, isoprene glycol, 3-methyl-1,5-pentanediol, sorbite, catechol, resorcinol, hydroquinone, bisphenol A, bisphenol F, hydrogenated bisphenol A , hydrogenated bisphenol F, 2 dihydric alcohol and dimer diol; glycerin, 2- (hydroxymethyl) -1,3-propanediol, 1,2,3-butane triol, 1,2,3-pentane triol, 2 - methyl-1,2,3-propanetriol, 2-methyl-2 , 3,4-butane triol, 2-ethyl-1,2,3-butane triol, 2,3,4-pentane triol, 2,3,4-hexane triol, 4-propyl-3,4,5-heptane triols, 2,4-dimethyl-2,3,4-pentane triol, 1,2,4-butane triol, 1,2,4-pentane triol, trimethylol ethane, trihydric alcohols such as trimethylolpropane; pentaerythritol , erythritol, 1,2,3,4-pen Thante troll, 2,3,4,5-hexane tetrol, 1,2,4,5-pen Thante troll, 1,3,4,5-hexane tetrol , diglycerol, tetravalent alcohols sorbitan and the like; adonitol, arabitol, xylitol, pentavalent alcohols triglycerol and the like; dipentaerythritol, sorbitol, mannitol Le, iditol, inositol, dulcitol, talose, hexavalent alcohols such as allose, polyglycerin or their dehydrated condensates and the like.

Examples of the metal hydroxyl metal salts include alkali metal or alkaline earth metal and zinc, as the alkali metals or alkaline earth metals, such as sodium, potassium, magnesium, calcium, and the like. Among these, from the viewpoint of improving the durability of the frictional characteristic effect, alkaline earth metals and zinc are preferred.
-COX formula (3) Among the metal salt the general formula (3) is a carboxylic acid salt of a carboxyl group structure is preferred.

The ashless friction modifier of the present invention, from the viewpoint of improving the durability of the frictional characteristic effects, at least one compound preferably selected from the general formula (3), the general formula (3) only one compound selected from among may be used alone or may be used mixtures of two or more compounds.
As preferable examples of the general formula (3) compounds represented by, N- acyl sarcosine, among them R 9 is an acyl group of 18 carbon atoms, R 10 is a methyl group, R 11 is hydrogens, X a hydroxyl group, n is or is N- oleoyl sarcosine at 0, the acyl group of R 9 is 18 carbon atoms, R 10 is a methyl group, R 11 is hydrogen, R 12 is hydrogens, X a hydroxyl group, n is a 1 N- I oil -N- methyl -β- -alanine.

The content of the ashless friction modifier, based on the total amount of the composition, from 0.01 to 10 wt%, preferably 5 wt% or less, and more preferably not more than 2 wt%. If the content exceeds 10 mass%, further improvement in the frictional properties of commensurate to the content is not observed, it is not preferable because the storage stability is lowered. On the other hand, the total amount of the composition, preferably at least 0.05 wt%, more preferably not more than 0.1 mass%. If the content is less than 0.01 wt% is not preferable because the effect of improving frictional properties is not observed.

The lubricating oil composition for internal combustion engines (E) anti-wear agents present invention, further in addition to the above additives, it is preferable to add zinc dialkyldithiophosphate (ZnDTP) as an anti-wear agents, for example, as the compound It may be mentioned the compounds shown in the following general formula (4).

Figure JPOXMLDOC01-appb-C000004

R 13 ~ R 16 in the general formula (4) are each independently hydrogen or at least one is a linear or branched alkyl group having 1 to 24 carbon atoms, the alkyl group, the also primary, in secondary, it may be a tertiary.
In the present invention, these zinc dialkyldithiophosphate may be used alone or may be used in combination of two or more kinds thereof, zinc dithiophosphate having primary alkyl groups (primary ZnDTP) or second preferably zinc dithiophosphate (secondary ZnDTP) containing grade alkyl group, in particular, those based on zinc dithiophosphate of a secondary alkyl group is preferable for increasing the wear resistance.

In the lubricating oil composition of the present invention, the content of zinc dialkyldithiophosphate, the total amount of the composition, as phosphorus content is preferably 0.02-0.2 wt%, more preferably 0.03-0.1 it may be blended so that the mass%. In the phosphorus content is less than 0.02 wt%, wear resistance and high-temperature detergency is not sufficient, when it exceeds 0.2 wt% is not preferable catalyst poisoning of the exhaust gas catalyst becomes remarkably.

The internal combustion engine lubricating oil composition of the present invention for the purpose is not impaired scope of the present invention, other additives as required, such as viscosity index improvers, pour point depressants, antioxidants, wear agents or extreme pressure agents, friction modifiers, dispersants, rust inhibitors, surfactants or demulsifier, can be appropriately compounded antifoaming agent.

For example, the viscosity index improver is available non-dispersant viscosity index improver and dispersant type viscosity index improvers, specifically, non-distributed or distributed polymethacrylate and olefin copolymer or polyisobutene, polystyrene, ethylene - propylene copolymer, styrene - diene copolymers and hydrides and the like can be used. These weight average molecular weight is generally a 5,000 to 1,000,000, in order to enhance the fuel saving performance, a weight average molecular weight of 100,000 to 1,000,000, preferably from 200,000 to 900,000, particularly preferably to use the viscosity index improver is 400,000 to 800,000. In the present invention, in particular, the following general formula (5) ratio of the structural unit represented by 30 to 90 mol%, the proportion of 0.1 to 50 mol of structural units represented by the following general formula (6) %, since it hydrocarbon backbone ratio is viscosity index improver is 0.18 or less of the poly (meth) acrylate based viscosity index improver is improved fuel economy, preferred.

Figure JPOXMLDOC01-appb-C000005

Figure JPOXMLDOC01-appb-C000006

Incidentally, R 17 in the general formula (5) represents hydrogen or a methyl group, R 18 is R 19 a linear or branched hydrocarbon group having 6 or less carbon atoms, in the general formula (6) represents hydrogen or a methyl group, R 20 is straight-chain or branched hydrocarbon group having 16 or more carbon atoms.
Further, the viscosity index improver, PSSI in diesel injectors method (permanent shear stability index) is preferably from 30 or less. PSSI is poor shear stability when more than 30, in order to maintain the kinematic viscosity and HTHS viscosity after use than a certain, there is a possibility that the initial fuel saving is deteriorated.
Here, the "PSSI in a diesel injector method", conforms to ASTM D6022-01 (Standard Practice for Calculation of Permanent Shear Stability Index), ASTM D6278-02 (Test Method for Shear Stability of Polymer Containing Fluids Using a european Diesel Injector Apparatus) was calculated based on the measured data by means permanent shear stability index of polymer (permanent shear stability index).

Examples of pour point depressants, lubricating base oils in a compatible polymethacrylate-based polymers used, alkylated aromatics, fumarate - vinyl acetate copolymer, ethylene - vinyl acetate copolymer or the like can be used.

The detergent-dispersant, succinimide, benzylamine, alkyl polyamine, polybutene amine or modified products of these boron compounds and sulfur compounds, such as alkenyl succinic acid esters may be used.
The detergent-dispersant is preferably a succinimide mono type or bis-type succinimide bis type is more preferable. Further, particularly preferably a succinimide of bis-type boron-free.
Furthermore, this detergent-dispersant is preferably a molecular weight of 1000 or more, more preferably 5,000 or more, more preferably 7000 or more, and still more preferably up to 9000 or more. Further, it is preferably a molecular weight of 30,000 or less, preferably 25,000, and more preferably a molecular weight of 20,000 or less. If a molecular weight of 1,000 or less, there is a possibility that the detergency is insufficient, while if it exceeds a molecular weight of 30,000, fuel economy of the engine oil composition may be significantly deteriorated.

The content of the detergent dispersant, an engine oil based on the total amount of the composition, preferably 0.1 to 15% by weight, more preferably 0.5 to 10 mass%, more preferably from 1.0 to 8 wt% is there. Cleaning When the content of the dispersant is less than 0.1 mass%, there is a possibility that detergency is insufficient, while if it exceeds 15 wt%, fuel economy is greatly deteriorated in the engine oil composition there is a risk of.
Further, N content of detergent dispersant is preferably 0.1 or more, more preferably 0.3 or more, more preferably 0.4 or more, further preferably 0.5 or more. Further, it is preferably 2.0 or less, preferably 1.0 or less, and more preferably 0.8 or less. For N content 0.1 or less, there is a possibility that detergency is insufficient, while if it exceeds N content 2.0, possibly fuel economy of the engine oil composition is deteriorated significantly is there.

As the antioxidant, phenolic compounds and amine compounds such as long as it is generally used in lubricating oils, are both available, for example, 2,6-di -tert- butyl-4 - alkylphenols such as methylphenol, bisphenols such as 4,4-bis (2,6-di -tert- butyl-4-methylphenol), naphthylamines such as phenyl -α- naphthylamine, dialkyl diphenylamines, phenothiazines, and the like can be used.

The extreme pressure additives and anti-wear agents, for example, phosphoric acid esters, phosphorous acid esters and phosphorus-based compounds and disulfides such as salts thereof, sulfur-based compounds such as sulfurized olefins and sulfurized fats and oils be able to.
The rust inhibitor, e.g., alkenyl succinic acids, alkenyl succinic acid esters, polyhydric alcohol esters, petroleum sulfonates, dinonyl naphthalene sulfonate or the like can be used.
Examples of the corrosion inhibitor include benzotriazole, thiadiazole, compounds of imidazole can be used.
As the defoaming agent, for example, silicone compounds such as dimethyl silicone or fluorosilicone be used.

Although the addition amount of these additives is optional, in the usual total amount of the composition, the content of the defoaming agent 0.0005 to 0.01 mass%, the content is 0.05 to 20 viscosity index improver mass%, the content of the corrosion inhibitor is 0.005-0.2 wt%, the content of other additives are each about 0.05 to 10 wt%.

Kinematic viscosity at 100 ° C. for an internal combustion engine lubricating oil composition of the present invention is preferably 4.0 mm 2 / s or more, more preferably 6.0 mm 2 / s or higher, more preferably 6.1 mm 2 / s or more, preferably most preferably at 6.2 mm 2 / s or more, or less 12.5 mm 2 / s, more preferably not more than 9.3 mm 2 / s, more preferably 8.5 mm 2 / s is less than or equal to. The kinematic viscosity at 100 ° C. referred herein indicates a kinematic viscosity at 100 ° C., which is measured according to ASTM D-445. If the kinematic viscosity at 100 ° C. of less than 4.0 mm 2 / s, there is insufficient lubricity may give low temperature viscosity and sufficient fuel efficiency performance required in the case of more than 12.5 mm 2 / s Never fear there is.

Moreover, kinematic viscosity at 40 ° C. of the lubricating oil composition is preferably 4 ~ 50mm 2 / s, preferably 40 mm 2 / s or less, more preferably 35 mm 2 / s. Further, the kinematic viscosity at 40 ° C., preferably from 15 mm 2 / s or more, more preferably 18 mm 2 / s or more, more preferably 20 mm 2 / s or more, particularly preferably 22 mm 2 / s or more, and most preferably 25 mm 2 / it is s or more. The kinematic viscosity at 40 ° C. referred herein indicates a kinematic viscosity at 40 ° C. which is measured according to ASTM D-445. If it is less than the dynamic viscosity of 4 mm 2 / s at 40 ° C., there is insufficient lubricity may, possibly low-temperature viscosity and sufficient fuel saving performance may not be obtained necessary in the case of more than 50 mm 2 / s is there.

Further, the viscosity index of the lubricating oil composition is 120 or greater, preferably 400 or less, preferably 190 or more, more preferably 200 or more, particularly preferably 210 or more. If the viscosity index is less than 120, while maintaining the HTHS viscosity of 0.99 ° C., it may become difficult to improve the fuel economy. Further, if the viscosity index exceeds 400, there is a possibility that evaporation is deteriorated, there is a possibility that malfunction due to the lack of compatibility with more solubility and sealing material of the additive occurs.

While maintaining the durability by preventing a problem of a low viscosity, in order to impart fuel economy is, HTHS viscosity at 0.99 ° C. ( "HTHS viscosity". Which is also referred to as "high-temperature high-shear viscosity") high, kinematic viscosity at while 40 ° C., it is effective to reduce the HTHS viscosity at a kinematic viscosity and 100 ° C. at 100 ° C., in the conventional lubricating oils to meet all of these requirements has been very difficult.

HTHS viscosity at 100 ° C. of the lubricating oil composition is preferably from 5.5 mPa · s, more preferably 5.0 mPa · s or less, more preferably 4.7 mPa · s or less, particularly preferably 4.5mPa · s is less than or equal to. Further, preferably 3.0 mPa · s or more, more preferably 3.5 mPa · s or more, particularly preferably 4.0 mPa · s or more, and most preferably 4.1 mPa · s or more. The HTHS viscosity at 100 ° C. in the present invention, showing a high-temperature high-shear viscosity at 100 ° C. as defined in ASTM D4683. If HTHS viscosity at 100 ° C. of less than 3.0 mPa · s, there is insufficient lubricity may, low temperature viscosity and sufficient fuel efficiency performance is not obtained the required if more than 5.5 mPa · s I fear there is.

HTHS viscosity at 0.99 ° C. of the lubricating oil composition is preferably at 1.5 mPa · s or more, more preferably 1.9 mPa · s or more, more preferably 2.1 mPa · s or more, particularly preferably 2.2mPa · s or more, and most preferably 2.3mPa · s or more. Further, preferably 3.0 mPa · s or less, more preferably 2.7 mPa · s or less, particularly preferably 2.5 mPa · s or less, and most preferably not more than 2.4 mPa · s. The HTHS viscosity at 0.99 ° C. in the present invention, showing a high-temperature high-shear viscosity at 0.99 ° C. as defined in ASTM D4683. By the HTHS viscosity at 0.99 ° C. and 1.5 mPa · s or more, it is possible to obtain sufficient lubricity, by less 3.0 mPa · s, the low temperature viscosity and sufficient fuel saving performance required to give It is.

Further, (HTHS viscosity at HTHS viscosity / 100 ° C. at 0.99 ° C.) ratio of the HTHS viscosity at HTHS viscosity and 100 ° C. at 0.99 ° C. of the lubricating oil composition of the present invention is preferably 0.45 or more, more preferably 0.475 or more, further preferably 0.50 or more. When the ratio is less than 0.45, there may not low-temperature viscosity and sufficient fuel efficiency performance obtained required.

Further, the evaporation loss of the lubricating oil composition of the present invention is preferably 15 mass% or less in NOACK evaporation amount, more preferably at most 14 mass%, still more preferably less 13 wt% , and most preferably 12 wt% or less. With less NOACK evaporation of 15 mass% of the lubricating base oil component, it is possible to reduce the evaporation loss of the lubricating oil, it is possible to suppress the viscosity increase and the like. Herein, the term NOACK evaporation loss and is a measure of the evaporation amount of the lubricating oil measured according to ASTM D 5800.

Further, in the case of using an alkaline earth metal salicylate detergents containing boron as salicylate metallic detergent, the content of boron in the lubricating oil composition of the present invention (MB1) and the content of the alkaline earth metals ( the ratio of MB2), (MB1) / (MB2) is preferably 0.1 or more, more preferably 0.15 or more, more preferably 0.2 or more. The (MB1) / (MB2) is preferably 0.5 or less, more preferably 0.4 or less, more preferably 0.3 or less.

Hereinafter will be described the contents of the present invention examples and comparative examples more specifically, the present invention should not be construed as being limited to these examples.

(Examples 1-4, Comparative Examples 1-4)
(A) hydrocracked lubricating base oil having properties shown in the lubricating base oil Table 1 were used in proportions shown in Table 2.

Figure JPOXMLDOC01-appb-T000007

The following additives were added to the lubricating base oil in the proportions shown in Table 2, to prepare lubricating oil compositions.

(B) a molybdenum-based friction modifier molybdenum dithiocarbamates: in the general formula (1), R 1 ~ R 4 represents an alkyl group having 8 or 13 carbon atoms, a and b are 2, the concentration of the molybdenum element 10 wt%, sulfur 11 wt%
(C) salicylate metallic detergent (C-1) Overbased Ca salicylate: metal ratio of 2.3, the number 14 ~ 18, Ca content 6.2 wt% of carbon atoms in the alkyl group, base number 180 mg KOH / g
(C-2) an overbased borate Ca salicylate: metal ratio of 2.5, the number 14 ~ 18, Ca content 6.8 wt% of carbon atoms in the alkyl group, B content of 2.7 mass%, base number 190 mg KOH / g

(D) ashless friction modifier (D-1) N- oleoyl -N- methyl -β- alanine (D-2) oleoyl sarcosine (D-3) N- lauroyl -N- methyl -β- alanine (D-4) N- lauroyl sarcosine

(E) anti-wear agent (E-1) ZnDTP: primary alkyl groups, the number 8, Zn content 9.0 wt% carbon, P content 7.4 wt%, S content of 15 mass%
(E-2) ZnDTP: secondary alkyl group, having 4 and 6, Zn content 8.0 wt% carbon, P content 7.2 wt%, S content of 15 mass%

(F) Other additives (F-1) non-dispersion type PMA based viscosity index improver (Mw = 400,000, PSSI = 7)
(F-2) polybutenyl succinimide: molecular weight 9000, N content 0.7% by weight
(F-3) antioxidant, defoaming agent (dimethyl silicone), etc.

The prepared lubricating oil composition, under the following conditions, subjected to motoring friction test were measured friction torque. Calculating an average friction torque of each of the lubricant composition was calculated improvement rate when relative to the friction torque of Comparative Example 1 and 4. The results obtained are shown in Table 2 the% with physical properties of the lubricating oil composition.

(Test condition)
Using Engine: 3L, DOHC engine oil temperature: 80 ° C.
Rotational speed: 550rpm

Figure JPOXMLDOC01-appb-T000008

These results also alkyl or alkenyl group or molybdenum-based friction modifier and the molecule contain a compound selected from amino acids and / or derivatives thereof having an acyl group, an alkyl group or an alkenyl group or an acyl group but less than 15 carbon atoms, although the effect is low (Comparative example 1-4), alkyl or alkenyl having 15 to 24 carbon atoms contains a compound selected from amino acids and / or derivatives thereof having an acyl group and, shows a remarkable friction reducing effect as an internal combustion engine lubricating oil composition of the present invention, low coefficient of friction, it is clear that a marked effect of excellent fuel efficiency performance.

Internal combustion engine lubricating oil composition of the present invention, fuel saving gasoline engine oil, can be suitably used as a fuel-saving engine oil, such as fuel saving diesel engine oil.

Claims (6)

  1. (A) a kinematic viscosity at 100 ° C. is 2.0 ~ 5.0mm 2 / s lubricant base oil, 0.005-0.2 as molybdenum weight of the total amount of the composition (B) a molybdenum-based friction modifier wt%, amino acid and a (C) salicylate metallic alkyl or alkenyl of from 0.01 to 1% by weight and (D) 15 ~ 24 carbon atoms of the detergent as a metal amount based on the total amount of the composition of the acyl group / or one or more compounds lubricating oil composition for an internal combustion engine containing 0.01 to 10 wt% selected from derivatives thereof.
  2. Wherein (C) salicylate metallic detergent, an internal combustion engine lubricating oil composition of claim 1 which is salicylate metallic detergent containing boron.
  3. The lubricating oil composition for internal combustion engines according to claim 1 or 2 HTHS viscosity of 1.9 ~ 2.7 mPa / s at 0.99 ° C..
  4. Internal combustion engine lubricating oil composition according to any one of claims 1 ~ 3 HTHS viscosity of 1.9 ~ 2.4 mPa / s at 0.99 ° C..
  5. NOACK evaporation loss is an internal combustion engine lubricating oil composition according to any one of claims 1 to 4, more than 15 wt%.
  6. (E) the total amount of the composition of the zinc dialkyldithiophosphate antiwear agents, the phosphorus amount, lubricating oil for an internal combustion engine according to any one of claims 1 to 5, 0.02 to 0.20 mass% Composition.
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61241396A (en) * 1985-04-19 1986-10-27 Ajinomoto Co Inc Lubricant
JPH08302378A (en) * 1995-04-28 1996-11-19 Nippon Oil Co Ltd Engine oil composition
JP2014132076A (en) * 2012-12-21 2014-07-17 Afton Chemical Corp Additive compositions with plural friction modifiers
JP2015021127A (en) * 2013-07-18 2015-02-02 アフトン・ケミカル・コーポレーションAfton Chemical Corporation Friction modifier for lubricating oil
WO2015022976A1 (en) * 2013-08-16 2015-02-19 Jx日鉱日石エネルギー株式会社 Lubricant oil composition for internal combustion engine

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5815809B2 (en) * 2014-07-22 2015-11-17 Jx日鉱日石エネルギー株式会社 Lubricating oil compositions

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61241396A (en) * 1985-04-19 1986-10-27 Ajinomoto Co Inc Lubricant
JPH08302378A (en) * 1995-04-28 1996-11-19 Nippon Oil Co Ltd Engine oil composition
JP2014132076A (en) * 2012-12-21 2014-07-17 Afton Chemical Corp Additive compositions with plural friction modifiers
JP2015021127A (en) * 2013-07-18 2015-02-02 アフトン・ケミカル・コーポレーションAfton Chemical Corporation Friction modifier for lubricating oil
WO2015022976A1 (en) * 2013-08-16 2015-02-19 Jx日鉱日石エネルギー株式会社 Lubricant oil composition for internal combustion engine

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