CN1759166A - Lubricating oil composition for transmission - Google Patents

Abstract

A lubricating oil composition for a transmission, characterized in that it comprises a base oil for a lubricating oil containing (A) a mineral oil based base oil for a lubricating oil so adjusted as to have a kinematic viscosity at 100 DEG C of 1.5 to 5 mm<2>/s and a % CN of 10 to 60, and (B) a base oil for a lubricating oil having a kinematic viscosity at 100 DEG C of 10 to 50 mm<2>/s and a sulfur content of 0.3 to 1 mass %, and optionally further (C) a synthetic oil consisting of carbon and hydrogen and having a number average molecular weight of 2,000 to 20,000, in respective specific amounts, and (D) an extreme pressure additive comprising a phosphorus based extreme pressure additive and a sulfur based extreme pressure additive and/or a phosphorus-sulfur based extreme pressure additive in an amount of 0.05 to 2 mass % based on the total amount of the above composition, wherein in the composition, the contents of phosphorus (P) and the total sulfur (S) are 0.01 to 0.05 and 0.05 to 0.3 mass %, respectively, and the P/S ratio is 0.10 to 0.40. The lubricating oil composition combines good fuel saving performance capability and satisfactory durability of a gear, a bearing and the like, and further is excellent in a viscosity at a low temperature and in oxidation stability.

Description

Lubricating oil composition for transmission

Invention field

The present invention relates to lubricating oil composition for transmission, relate more specifically to be applicable to the lubricating oil composition of automatic transmission, manual gear shifting and the stepless speed change device of automobile, though the low performance that prolongs its fatigue lifetime of said composition viscosity (following only be called " performance fatigue lifetime ") is fabulous and low temperature viscosity and oxidative stability are fabulous.The invention still further relates to improve speed change gear with low-viscosity lubricating oil composition fatigue lifetime performance method.

Background of invention

In recent years, from solving the approach that reduces environmental problems such as Carbon emission, press for automobile, building machinery and agricultural machine power consumption still less, promptly fuel consumption reduces.Particularly make the energy-conservation increases in demand of device such as its engine, speed change gear, final drive reduction device, compressor and hydraulic efficiency installation.Thereby, require these stirring resistance and friction resistance of installing used lubricating oil to reduce than in the past.

Reducing oil body may be to help to improve one of the speed change gear of fuel economy and the fuel economy improvement means of final drive reduction device example.For example, the automatic transmission of automobile or stepless speed change device have fluid torque-converter, humid clutch, gear-bearing mechanism, oil pump and hydraulic control system, and manual gear shifting or final drive reduction device sprocket drive spindle hold mechanism.Reduce that used oil body can reduce the stirring and the friction resistance of fluid torque-converter, humid clutch, gear-bearing mechanism and oil pump in this speed change gear, thereby improve its power transmission efficiency, the fuel economy of automobile is improved.

Used oil body causes obviously shorten the fatigue lifetime of said apparatus and mechanism thereof in these speed change gear but reduce, and may kill to cause some transmission fault.When particularly low-viscosity oil is pressed the additive compounding with the phosphorus base stage that is used to improve extreme pressure property, the remarkable variation of performance fatigue lifetime.Thereby, be difficult to reduce oil body usually.Though the sulfenyl extreme-pressure additive can improve performance fatigue lifetime of lubricating oil, the viscosity ratio additive that is known in base oil under the low lubricating condition to fatigue lifetime Effect on Performance bigger.

Can make speed change gear can keep for a long time various performances as the example of automotive transmission oil of gearshift performance comprise by optimize and compounding is synthesized and/or mineral base oil, anti-wear agent, extreme-pressure additive, metal detergent, ashless dispersant, friction modifiers and viscosity index improver obtain those, as disclosed among JP-A-3-39399,7-268375 and the 2000-63869.But these compositions are not to be purpose to improve fuel economy, thereby the kinematic viscosity height.These documents are all not mentioned by reducing oil body to Effect on Performance fatigue lifetime.Thereby, do not study the composition that can address the above problem as yet fully.In addition, described speed change gear needs excellent low temperature viscosity and oxidative stability with lubricating oil.

Summary of the invention

In view of above situation is finished the present invention, it is low but long fatigue lifetime and low temperature viscosity and the fabulous speed change gear lubricating oil of oxidative stability can be provided that the present invention aims to provide a kind of viscosity, particularly be applicable to the lubricating oil composition of automatic transmission, manual gear shifting and the stepless speed change device of automobile, have fuel economy and the long-term low frictional properties that is used for gear and bearing.

For addressing the above problem, carried out extensive studies, find to comprise to have transferred to specific %C _AAnd %C _NThe low viscosity lubricating base oil, transfer to ratio by the high viscosity mineral lubricant base oils of specific sulphur content with by the lubricating base oil of the synthetic oil of forming by carbon and hydrogen of certain number average molecular weight and specific extreme-pressure additive compounding that the gained lubricating oil composition for transmission can address the above problem in the specified range with the phosphorus content of composition and total sulfur content, finish the present invention based on this discovery.

First aspect the invention provides a kind of lubricating oil composition for transmission, comprising: the 100 ℃ of following kinematic viscosity that transfer to that contain (A) 60 to 95 quality % (based on the base oil total amount) are 1.5 to 5mm ²/ s and %C _NBe 10 to 60 lubricating base oil and (B) 100 ℃ of following kinematic viscosity of 5 to 40 quality % (based on the base oil total amount) be 10 to 50mm ²/ s and sulphur content are the lubricating base oil of the mineral lubricant base oils of 0.3 to 1 quality %, (D) extreme-pressure additive that comprises phosphorus base stage pressure additive, sulfenyl extreme-pressure additive and/or phosphorus-sulfenyl extreme-pressure additive of 0.05 to 2 quality % (based on total composition), the phosphorus content of wherein said composition (P) is 0.01 to 0.05 quality %, total sulfur content (S) is 0.05 to 0.3 quality %, and the P/S ratio is 0.10 to 0.40.

Second aspect the invention provides a kind of lubricating oil composition for transmission, comprising: the 100 ℃ of following kinematic viscosity that transfer to that contain (A) 60 to 94 quality % (based on the base oil total amount) are 1.5 to 5mm ²/ s, %C _NBe 10 to 60 and %C _ABe 1 or 100 ℃ of following kinematic viscosity of littler lubricating base oil, (B) 5 to 25 quality % (based on the base oil total amount) be 10 to 50mm ²/ s and sulphur content be the mineral lubricant base oils of 0.3 to 1 quality % and (C) number-average molecular weight of 1 to 15 quality % (based on the base oil total amount) be the lubricating base oil of 2 000 to 20 000 the synthetic oil of forming by carbon and hydrogen, (D) extreme-pressure additive that comprises phosphorus base stage pressure additive, sulfenyl extreme-pressure additive and/or phosphorus-sulfenyl extreme-pressure additive of 0.05 to 2 quality % (based on total composition), the phosphorus content of wherein said composition (P) is 0.01 to 0.05 quality %, total sulfur content (S) is 0.05 to 0.3 quality %, and the P/S ratio is 0.10 to 0.40.

The third aspect, the invention provides a kind of improve lubricating oil composition for transmission fatigue lifetime performance method, described lubricating oil composition comprises: the 100 ℃ of following kinematic viscosity that transfer to that contain (A) 60 to 95 quality % (based on the base oil total amount) are 1.5 to 5mm ²/ s and %C _NBe 10 to 60 lubricating base oil and (B) 100 ℃ of following kinematic viscosity of 5 to 40 quality % (based on the base oil total amount) be 10 to 50mm ²/ s and sulphur content are the lubricating base oil of the mineral lubricant base oils of 0.3 to 1 quality %, (D) extreme-pressure additive that comprises phosphorus base stage pressure additive, sulfenyl extreme-pressure additive and/or phosphorus-sulfenyl extreme-pressure additive of 0.05 to 2 quality % (based on total composition), the phosphorus content of wherein said composition (P) is 0.01 to 0.05 quality %, total sulfur content (S) is 0.05 to 0.3 quality %, and the P/S ratio is 0.10 to 0.40.

Fourth aspect, the invention provides a kind of improve lubricating oil composition for transmission fatigue lifetime performance method, described lubricating oil composition comprises: the 100 ℃ of following kinematic viscosity that transfer to that contain (A) 60 to 94 quality % (based on the base oil total amount) are 1.5 to 5mm ²/ s, %C _NBe 10 to 60 and %C _ABe 1 or 100 ℃ of following kinematic viscosity of littler lubricating base oil, (B) 5 to 25 quality % (based on the base oil total amount) be 10 to 50mm ²/ s and sulphur content be the mineral lubricant base oils of 0.3 to 1 quality % and (C) number-average molecular weight of 1 to 15 quality % (based on the base oil total amount) be the lubricating base oil of 2 000 to 20000 the synthetic oil of forming by carbon and hydrogen, (D) extreme-pressure additive that comprises phosphorus base stage pressure additive, sulfenyl extreme-pressure additive and/or phosphorus-sulfenyl extreme-pressure additive of 0.05 to 2 quality % (based on total composition), the phosphorus content of wherein said composition (P) is 0.01 to 0.05 quality %, total sulfur content (S) is 0.05 to 0.3 quality %, and the P/S ratio is 0.10 to 0.40.

Be described in more detail below the present invention.

The used lubricating base oil of first aspect present invention (A) (hereinafter referred to as " component (A) ") is that to transfer to 100 ℃ of following kinematic viscosity be 1.5 to 5mm ²/ s and %C _NBeing 10 to 60 lubricating base oil, can be mineral lubricant base oils, synthetic lubricating base oil or its mixture.

The used component of second aspect present invention (A) is that to transfer to 100 ℃ of following kinematic viscosity be 1.5 to 5mm ²/ s, %C _NBe 10 to 60 and %C _ABeing 1 or littler lubricating base oil, can be mineral lubricant base oils, synthetic lubricating base oil or its mixture.

The example of mineral lubricant base oils comprises paraffin oil or naphthenic oil, and the lubricating oil distillate that crude oil normal pressure or underpressure distillation are produced obtains through any appropriate combination that is selected from solvent deasphalting, solvent extraction, hydrocracking, solvent dewaxing, catalytic dewaxing, hydrofining, sulfuric acid scrubbing and clay-treated process for purification; N-paraffin; And isoparaffin.

The production method of described mineral lubricant base oils does not have particular determination.For example, the lubricating oil distillate process that can use crude oil normal pressure or underpressure distillation to produce is selected from paraffin oil or the naphthenic oil that solvent deasphalting, solvent extraction, hydrocracking, solvent dewaxing, catalytic dewaxing, hydrofining, sulfuric acid scrubbing and clay-treated arbitrary or multiple process for purification obtain.These base oils can use separately or be used in combination with arbitrary proportion.

The example of preferred mineral lubricant base oils comprises following base oil:

(1) distillate of producing by paraffinic crude and/or polybase crude air distillation;

(2) the vacuum gas oil of producing by the topped oil underpressure distillation of paraffinic crude and/or polybase crude (WVGO);

(3) wax that obtains by lubricating oil dewaxing technology and/or the Fischer-Tropsch synthetic wax produced by the GTL method;

(4) be selected from above the oil that obtains of one or more oily mild hydrocracking (MHC) of (1) to (3);

(5) be selected from above the mixing oil of two or multiple oil of (1) to (4);

(6) deasphalted oil (DAO) that the oily diasphaltene of (1), (2), (3), (4) or (5) obtains above;

(7) oil that the oily mild hydrocracking (MHC) of (6) obtains above; With

(8) make the mixing oil of two or the multiple oil that are selected from (1) to (7) as the normal treating process of lubricating oil distillate warp of raw material and/or therefrom recovery and the lubricating oil that further recovery lubricating oil distillate obtains from purified product.

Described normal treating process does not have particular restriction.Thereby, can use any treating process commonly used when producing lubricating base oil.The example of normal treating process comprise (a) hydrofining such as hydrocracking and hydrofinishing, (b) solvent treatment such as furfural extraction, (c) dewaxing as solvent dewaxing and catalytic dewaxing, (d) with acid clay or activated clay carry out clay refining and (e) chemistry (acid or alkali) make with extra care as vitriolization and sodium-hydroxide treatment.Among the present invention, can use the arbitrary or multiple of these treating processes by any order.

The used mineral lubricant base oils of the present invention is preferably the base oil that the base oil that is selected from above-mentioned (1) to (8) obtains through following processing especially.

That is, be preferably make be selected from above-mentioned (1) to the base oil of (8) or the lubricating oil distillate hydrocracking or the wax-isomerization of therefrom reclaiming and make products obtained therefrom or the lubricating oil distillate that therefrom reclaims through dewaxing as solvent dewaxing or catalytic dewaxing, then hydrocracking mineral oil and/or the wax-isomerized isoparaffin base oil through dewaxing and obtaining again after solvent treatment or the solvent treatment as solvent dewaxing or catalytic dewaxing.The consumption of described hydrocracking mineral oil and/or wax-isomerized isoparaffin base oil is preferably 30 quality % or higher, more preferably 50 quality % or higher, preferred especially 70 quality % or higher, based on the base oil total amount.

The example of synthetic lubricating base oil comprises poly-alpha olefins and hydride thereof; Isobutylene oligomer and hydride thereof; Isoparaffin; Alkylbenzene; Alkylnaphthalene; Diester such as pentanedioic acid two (tridecyl) ester, di-2-ethylhexyl adipate, diisodecyl adipate, hexanodioic acid two (tridecyl) ester and Diisooctyl Sebacate; Polyol ester such as trimethylolpropane caprylate, TriMethylolPropane(TMP) pelargonate, tetramethylolmethane 2-ethylhexanoate and tetramethylolmethane pelargonate; The poly suboxygen alkyl glycol; The dialkyl group phenyl ether; And polyphenylene oxide.

Preferred synthetic lubricating base oil is a poly-alpha olefins.The representative instance of poly-alpha olefins includes 2 to 32, the oligopolymer or the multipolymer of the alpha-olefin of preferred 6 to 16 carbon atoms, as 1-octene oligopolymer, 1-decene oligopolymer, ethylene-propylene co-oligomer and hydride thereof.

The production method of poly-alpha olefins does not have particular restriction.For example, can in the presence of the Friedel-Crafts catalyst of polymerizing catalyst, make alpha-olefine polymerizing produce poly-alpha olefins as the title complex, alcohol (as ethanol, propyl alcohol and butanols), carboxylic acid or the ester (as ethyl acetate and ethyl propionate) that comprise aluminum chloride, boron trifluoride or boron trifluoride and water.

Component (A) is limited to 5mm on 100 ℃ of following kinematic viscosity ²/ s, preferred 4.5mm ²/ s, more preferably 4.0mm ²/ s, preferred especially 3.8mm ²/ s, and under be limited to 1.5mm ²/ s, preferred 2.0mm ²/ s, more preferably 2.5mm ²/ s.100 ℃ of following kinematic viscosity are 5mm ²/ s or lower lubricating base oil fluid resistance are little, thereby the little lubricating oil composition of available this kind lubricating base oil production lubricant housings friction resistance.100 ℃ of following kinematic viscosity are 1.5mm ²/ s or higher lubricating base oil can be used for producing and are enough to form oil film and cause the fabulous and little lubricating oil composition of vaporization losses base oil under the intensification condition of oilness.

The %C of component (A) _NBe 10 to 60, preferred 17 or higher, more preferably 20 or higher, preferred especially 22 or higher and preferred 40 or lower, more preferably 30 or lower.%C _NBe 10 or higher component (A) but enhancement component (B) thereby and the effect of extreme-pressure additive produce the fabulous composition of performance fatigue lifetime, and %C _NBe 60 or lower component (A) help to produce even also do not hinder at low temperatures the composition of machine movement.

The %C of component in the first aspect present invention (A) _ANo particular restriction.But %C _ABe preferably 2 or lower, more preferably 1 or lower, preferred especially 0.5 or lower.%C _ABe 2 or lower component (A) help the better composition of production oxidative stability.

The %C of component in the second aspect present invention (A) _ABe 1 or lower, preferred 0.5 or lower.%C _ABe 1 or lower component (A) help the better composition of production oxidative stability.

Term " %C _N" and " %C _A" all represent the naphthalene carbon number to account for the percentage of total carbon number and the percentage that the aromatic carbon number accounts for total carbon number, measure by the method for ASTM D 3238-85 regulation.

The viscosity index of component (A) does not have particular restriction.But described viscosity index be preferably 80 or higher, more preferably 90 or higher, preferred especially 110 or higher.Use viscosity index be 80 or higher lubricating base oil can produce from low temperature to all fabulous composition of pyritous viscosity characteristics.

The sulphur content of component (A) does not have particular restriction.But described sulphur content is preferably 0.05 quality % or lower, more preferably 0.02 quality % or lower, preferred especially 0.005 quality % or lower.The sulphur content of component (A) reduces the composition that can obtain the oxidative stability excellence.

Component (A) can be two or multi mineral base oil or two or the mixture of multiple synthetic base oil or the mixture of mineral base oil and synthetic base oil, as long as component (A) satisfies above-mentioned requirements.In this mixture two or the ratio of mixture of multiple base oil can select arbitrarily.

The content of component in the lubricating oil composition for transmission of first aspect present invention (A) is 60 to 95 quality %, preferred 70 quality % or higher, more preferably 75 quality % or higher, based on the base oil total amount.

The content of component in the lubricating oil composition for transmission of second aspect present invention (A) is 60 to 94 quality %, preferred 70 quality % or higher, more preferably 75 quality % or higher, based on the base oil total amount.

The mineral lubricant base oils of lubricating oil composition of the present invention (B) (hereinafter referred to as " component (B) ") is that 100 ℃ of following kinematic viscosity are 10 to 50mm ²/ s and sulphur content are the mineral lubricant base oils of 0.3 to 1 quality %.

Component (B) is 10 to 50mm 100 ℃ of following kinematic viscosity ²/ s, preferred 10 is to 35mm ²/ s.Component in the first aspect present invention (B) 100 ℃ of following kinematic viscosity more preferably 10 to 25mm ²/ s, preferred especially 10 is to 16mm ²/ s, and in the second aspect present invention component (B) 100 ℃ of following kinematic viscosity more preferably 16 to 35mm ²/ s, preferred especially 18 is to 25mm ²/ s.100 ℃ of following kinematic viscosity are lower than 10mm ²The mineral base oil of/s can not strengthen performance fatigue lifetime, and 100 ℃ of following kinematic viscosity are greater than 50mm ²The mineral base oil of/s is difficult to production and has the low viscous lubricating oil of wanting.

The sulphur content of component (B) is 0.3 to 1 quality %, preferred 0.4 to 1 quality %, more preferably 0.5 to 1 quality %.Consider that the sulfocompound in the component (B) helps to improve performance fatigue lifetime, the mineral base oil that sulphur content is lower than 0.3 quality % is not preferred, because be helpless to this improvement.Sulphur content has disadvantageous effect greater than the mineral base oil of 1 quality % to the oxidative stability of resulting composition.

For making excellent performance fatigue lifetime, the %C of component (B) _NBe preferably 15 to 40, more preferably 20 to 30.

The content of component in the lubricating oil composition for transmission of first aspect present invention (B) is 5 to 40 quality %, preferred 5 to 25 quality %, preferred especially 10 to 25 quality %, based on the base oil total amount.

The content of component in the lubricating oil composition for transmission of second aspect present invention (B) is 5 to 25 quality %, preferred 5 to 20 quality %, preferred especially 5 to 15 quality %, based on the base oil total amount.

The synthetic oil that the component of the lubricating oil composition for transmission of second aspect present invention (C) is made up of carbon and hydrogen, the number-average molecular weight of this synthetic oil are necessity of 2 000 to 20 000.

The example of component (C) comprises 2 to 32, polymkeric substance or the multipolymer and the hydride thereof of the alpha-olefin of preferred 2 to 16 carbon atoms.Specific examples comprises isobutylene oligomer, 1-octene oligopolymer, 1-decene oligopolymer, its hydride, ethene such as ethylene-propylene oligopolymer and the multipolymer of the alpha-olefin that 3 to 32 carbon atoms are arranged and the hydride of these multipolymers.

The number-average molecular weight of component (C) be preferably 3 000 or higher, more preferably 10 000 or higher, preferred especially 15 000 or higher, and be preferably 18 500 or lower.Number-average molecular weight is lower than 2 000 component (C) can not improve performance fatigue lifetime, also the low temperature viscosity characteristic is had disadvantageous effect and number-average molecular weight is higher than 20 000 component (C) even blending when a small amount of.

Because of the characteristic of component (C) with its type change, need select best synthetic oil as component (C) so will improve the fatigue lifetime performance.For example, use under the situation of the polymkeric substance of the alpha-olefin that 8 to 16 carbon atoms are arranged or multipolymer or its any hydride, selecting 100 ℃ of following kinematic viscosity is 40 to 500mm ²/ s, preferred 80 is to 350mm ²The polymkeric substance of/s or multipolymer are preferred.Use has the polymkeric substance of alpha-olefin of 8 to 16 carbon atoms or multipolymer or its hydride can obtain to have better fatigue lifetime of performance and the composition of shear stability improved action, thereby easilier keeps initial extreme pressure property to keep for a long time.Use under the situation of the multipolymer of ethene and the alpha-olefin that 3 to 32 carbon atoms are arranged or its hydride, preferably select 100 ℃ of following kinematic viscosity greater than 500mm ²/ s's.Fatigue lifetime, improved action helped the fabulous composition of production shear stability preferably owing to higher this analog copolymer of molecular weight or its hydride even blending also can show when a small amount of, so this multipolymer or its hydride can keep extreme pressure property for a long time, thereby most preferably be used for speed change gear low-viscosity lubricating oil composition such as the present invention.

The content of component in the lubricating oil composition for transmission of second aspect present invention (C) is 1 to 15 quality %, preferred 2 to 10 quality %, preferred especially 2 to 5 quality %, based on the base oil total amount.

For improve fuel economy and fatigue lifetime performance, be preferably as follows its performance of adjusting by component (A) and the base oil (B) formed in the lubricating oil composition for transmission of first aspect present invention.

The kinematic viscosity of base oil under 100 ℃ is preferably 2.5 to 6mm ²/ s, more preferably 2.5 to 4.5mm ²/ s even more preferably 3 to 4mm ²/ s, preferred especially 3 is to 3.8mm ²/ s.

Sulphur content is preferably 0.02 to 0.2 quality %, more preferably 0.04 to 0.15 quality %, preferred especially 0.05 to 0.13 quality %.

%C _NBe preferably 17 to 40, more preferably 18 to 40, preferred especially 20 to 30.

For improve fuel economy and fatigue lifetime performance, be preferably as follows its performance of adjusting by component (A), (B) and the base oil (C) formed in the lubricating oil composition for transmission of second aspect present invention.

The kinematic viscosity of base oil under 100 ℃ is preferably 3 to 6mm ²/ s, more preferably 4 to 5.5mm ²/ s, preferred especially 4 is to 5mm ²/ s.

Sulphur content is preferably 0.02 to 0.2 quality %, more preferably 0.04 to 0.15 quality %, preferred especially 0.05 to 0.13 quality %.

%C _NBe preferably 17 to 40, more preferably 18 to 30, preferred especially 20 to 25.

Lubricating oil composition for transmission of the present invention contains the phosphorus base stage presses additive, sulfenyl extreme-pressure additive and/or phosphorus-sulfenyl extreme-pressure additive as component (D).

The phosphorus base stage is pressed the example of additive to comprise phosphoric acid, phosphorous acid, is had 2 to 30, the phosphoric acid ester of the alkyl of preferred 3 to 20 carbon atoms, have 2 to 30, the phosphorous acid ester and the salt thereof of the alkyl of preferred 3 to 20 carbon atoms.

The example of sulfenyl extreme-pressure additive comprises sulfurized fat and oil, olefine sulfide, dialkyl polysulfide, dithiocarbamate, thiadiazoles and benzothiazole.

The example of phosphorus-sulfenyl extreme-pressure additive comprises thiophosphoric acid, thiophosphorous acid, have 2 to 30, the thiophosphatephosphorothioate of the alkyl of preferred 3 to 20 carbon atoms, have 2 to 30, thiophosphite, its salt and the zinc dithiophosphate of the alkyl of preferred 3 to 20 carbon atoms.

Component (D) is preferably pressed additive by at least a phosphorus base stage that is selected from phosphorous acid, phosphorous acid monoesters, phosphorous acid diester, tris phosphite and salt thereof; Be selected from least a sulfenyl extreme-pressure additive of sulfurized fat and oil, olefine sulfide, dialkyl polysulfide, dithiocarbamate, thiadiazoles and benzothiazole; And/or be selected from the extreme-pressure additive of at least a phosphorus-sulfenyl extreme-pressure additive of thiophosphorous acid, thiophosphorous acid monoesters, thiophosphorous acid diester, thiophosphorous acid three esters, dithio phosphorous acid, dithio phosphorous acid monoesters, dithio phosphorous acid diester, dithio tris phosphite, trithio phosphorous acid, trithio phosphorous acid monoesters, trithio phosphorous acid diester, trithio tris phosphite and salt thereof.

There is the example of the alkyl of 2 to 30 carbon atoms to comprise alkyl, cycloalkyl, alkyl-cycloalkyl, alkenyl, aryl, alkaryl and aralkyl.

The example of alkyl comprises straight or branched alkyl such as ethyl, propyl group, butyl, amyl group, hexyl, heptyl, octyl group, nonyl, decyl, undecyl, dodecyl, tridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl and octadecyl.

The example of cycloalkyl includes those of 5 to 7 carbon atoms, for example cyclopentyl, cyclohexyl and suberyl.

The example of alkyl-cycloalkyl includes those of 6 to 11 carbon atoms, for example methylcyclopentyl, dimethylcyclopentyl, methylethyl cyclopentyl, diethyl cyclopentyl, methylcyclohexyl, Dimethylcyclohexyl, methylethyl cyclohexyl, diethyl cyclohexyl, methyl suberyl, dimethyl suberyl, methylethyl suberyl and diethyl suberyl, wherein said alkyl can be bonded in any position of described cycloalkyl.

The example of alkenyl comprises butenyl, pentenyl, hexenyl, heptenyl, octenyl, nonene base, decene base, undecenyl, dodecenyl succinic, tridecylene base, tetradecene base, 15 carbene bases, cetene base, heptadecene base and vaccenic acid base, all can be straight or branched, the position of its pair key can change.

The example of aryl comprises phenyl and naphthyl.

The example of alkaryl includes those of 7 to 18 carbon atoms, for example tolyl, xylyl, ethylbenzene base, propyl phenyl, butylbenzene base, penta phenyl, own phenyl, heptan phenyl, hot phenyl, nonyl phenyl, the last of the ten Heavenly stems phenyl, undecyl phenyl and dodecylphenyl, wherein alkyl can be a straight or branched, can be bonded in any position of aryl.

The example of aralkyl includes those of 7 to 12 carbon atoms, for example benzyl, styroyl, hydrocinnamyl, benzene butyl, benzene amyl group and benzene hexyl, and wherein alkyl can be a straight or branched.

Described phosphorus base stage presses the concrete preferred embodiment of additive to comprise monobutyl phosphate, phosphoric acid one monooctyl ester, phosphoric acid one lauryl, dibutyl phosphate, dioctylphosphoric acid ester, the di(2-ethylhexyl)phosphate lauryl, tributyl phosphate, trioctyl phosphate, the tricresyl phosphate lauryl, triphenylphosphate, phosphorous acid one butyl ester, phosphorous acid one monooctyl ester, phosphorous acid one lauryl, dibutyl phosphite, dioctyl phosphite, phosphorous acid two lauryls, tributyl phosphate, the tricresyl phosphite monooctyl ester, trilauryl phosphite, triphenyl phosphite, and salt, wherein the phosphorous acid ester base stage is pressed additive, particularly phosphorous acid diester base stage pressure additive is preferred.

The preferred embodiment of phosphorus-sulfenyl extreme-pressure additive comprises having 1 to 3 in the molecule, preferred 2 or 3, those of preferred especially 3 sulphur, thiophosphoric acid one butyl ester for example, thiophosphoric acid one monooctyl ester, thiophosphoric acid one lauryl, DBTPhA, the thiophosphoric acid dioctyl ester, thiophosphoric acid two lauryls, tributyl thiophosphate, the tri o cresyl thiophosphate monooctyl ester, triphenyl-thiophosphate, the tri o cresyl thiophosphate lauryl, thiophosphorous acid one butyl ester, thiophosphorous acid one monooctyl ester, thiophosphorous acid one lauryl, dibutyl thiophosphite, the thiophosphorous acid dioctyl ester, thiophosphorous acid two lauryls, the thiophosphorous acid tri-n-butyl, thiophosphorous acid three monooctyl esters, the thiophosphorous acid triphenylmethyl methacrylate, trilauryl thiophosphite and salt thereof, wherein the thiophosphite base stage is pressed additive, particularly trithiophosphite base stage pressure additive is preferred.

The example of the salt of (sulfo-) phosphoric acid ester and (sulfo-) phosphorous acid ester comprises that the amine compound of the alkyl that makes (sulfo-) phosphate monoester, (sulfo-) phosphodiester, (sulfo-) phosphorous acid monoesters or (sulfo-) phosphorous acid diester and nitrogen compound such as ammonia or intramolecularly that an alkyl that 1 to 8 carbon atom arranged or hydroxyl only be arranged or metal base such as zinc oxide or zinc chloride reaction are so that remain the salt that all or part of neutralization of acid-hydrolysis obtains.

The specific examples of nitrogen compound comprises ammonia, alkylamine, wherein said alkyl can be a straight or branched, for example Monomethylamine, monoethylamine, a propylamine, monobutylamine (MBA), an amylamine, a hexylamine, a heptyl amice, an octylame, dimethylamine, methyl ethyl-amine, diethylamine, methyl propylamine, ethyl propylamine, dipropyl amine, methylbutylamine, ethyl butyl amine, propyl group butylamine, dibutylamine, diamylamine, dihexylamine, two heptyl amices and Di-Octyl amine; Alkanolamine, wherein said chain triacontanol base can be a straight or branched, for example a carbinolamine, Monoethanolamine MEA BASF, monopropylene glycol amine, a butanolamine, an amylalcohol amine, oneself hydramine, an enanthol amine, an octanol amine, a nonyl alcohol amine, dimethanolamine, methanol amine, diethanolamine, methyl alcohol Propanolamine, ethanol propanol amine, dipropanolamine, methyl alcohol butanolamine, ethanol and butanol amine, propyl alcohol butanolamine, two butanolamines, diamyl hydramine, two hexanol amine, two enanthol amine and two octanol amine; And composition thereof.

The example of sulfurized fat and oil comprises oily as sulfuration lard, sulfo-rapeseed oil, sulfurized castor oil, sulfuration soya-bean oil and sulfuration Rice pollard oil, and curing lipid acid is as sulfuration oleic acid and vulcanize ester as the sulfuration Witconol 2301.

The example of olefine sulfide comprises compound shown in the formula (1):

R ¹¹-S _x-R ¹² (1)

In the formula (1), R ¹¹For the alkenyl of 2 to 15 carbon atoms, R are arranged ¹²For the alkyl or the alkenyl of 2 to 15 carbon atoms are arranged, x is 1 to 8 integer.

The compound of this formula can be by 2 to 15 carbon atoms be arranged alkene or its dipolymer to tetramer and sulphur or vulcanizing agent such as sulfur subchloride reaction obtain.Preferred alkene is propylene, iso-butylene and diisobutylene.

The dialkyl polysulfide is a compound shown in the formula (2):

R ¹³-S _y-R ¹⁴ (2)

In the formula (2), R ¹³And R ¹⁴Independently for alkyl (comprising cycloalkyl) that 1 to 20 carbon atom is arranged, the aryl of 6 to 20 carbon atoms is arranged or the aralkyl of 7 to 20 carbon atoms is arranged, can be same to each other or different to each other, y is 2 to 8 integer.

R ¹³And R ¹⁴Specific examples comprise methyl, ethyl, n-propyl, sec.-propyl, normal-butyl, isobutyl-, sec-butyl, the tertiary butyl, various types of amyl group, various types of hexyl, various types of heptyl, various types of octyl group, various types of nonyl, various types of decyl, various types of dodecyl, cyclohexyl, phenyl, naphthyl, tolyl, xylyl, benzyl and styroyl.

The concrete preferred embodiment of dialkyl polysulfide comprises dibenzyl polysulfide, two uncle's nonyl polysulfides, two (dodecyl) polysulfide, di-t-butyl polysulfide, dioctyl polysulfide, phenylbenzene polysulfide and dicyclohexyl polysulfide.

The specific examples of dithiocarbamate comprises compound shown below:

In formula (3) and (4), R ¹⁵, R ¹⁶, R ¹⁷, R ¹⁸, R ¹⁹And R ²⁰All independently for 1 to 30, the alkyl of preferred 1 to 20 carbon atom, R are arranged ²¹For hydrogen or alkyl, the preferred hydrogen of 1 to 30 carbon atom is arranged or the alkyl of 1 to 20 carbon atom is arranged, e is 0 to 4 integer, and f is 0 to 6 integer.

There is the example of the alkyl of 1 to 30 carbon atom to comprise alkyl, cycloalkyl, alkyl-cycloalkyl, alkenyl, aryl, alkaryl and aralkyl.

The example of thiadiazoles comprises shown in the formula (5) 1,3, shown in 4-thiadiazole compound, the formula (6) 1,2, and shown in 4-thiadiazoles and the formula (7) 1,4, the 5-thiadiazole compound:

Formula (5) in (7), R ²², R ²³, R ²⁴, R ²⁵, R ²⁶And R ²⁷Can be same to each other or different to each other, all be hydrogen or the alkyl that 1 to 30 carbon atom is arranged independently, and g, h, i, j, k and l all are 0 to 8 integer independently.

There is the example of the alkyl of 1 to 30 carbon atom to comprise alkyl, cycloalkyl, alkyl-cycloalkyl, alkenyl, aryl, alkaryl and aralkyl.

Among the present invention, component (D) is preferably phosphorous acid diester base stage and presses additive such as phosphorous acid two 2-ethylhexyls, sulfenyl extreme-pressure additive such as olefine sulfide and thiadiazoles and/or trithio tris phosphite base stage pressure additive such as trilauryl trithiophosphite, because they can improve performance fatigue lifetime.

For fatigue lifetime performance, extreme pressure property, resistance to abrasion and oxidative stability, the content of component (D) is 0.05 to 2 quality %, preferred 0.1 to 1 quality %.But in order further to improve performance fatigue lifetime, the content of component (D) is more preferably counted 0.01 to 0.05 quality % even more preferably 0.02 to 0.04 quality % and be preferably 0.01 to 0.25 quality %, preferred 0.02 to 0.15 quality %, preferred especially 0.07 to 0.12 quality % by sulphur by phosphorus.Supposing that institute is phosphorous in the component (D) has described optimum range with mass ratio (P/S) sulphur, is preferably 0.13 to 2, more preferably 0.2 to 1, preferred especially 0.2 to 0.5, but this ratio can change with the sulphur content of component (B).

Lubricating oil composition for transmission of the present invention can comprise be selected from except that component (C) thus one or more high viscosity ucon oil make said composition have excellent fatigue lifetime of performance and have excellent extreme pressure property in the early stage with behind the life-time service.This high viscosity ucon oil is that 100 ℃ of following kinematic viscosity are 40 to 500mm ²/ s, preferred 50 is to 450mm ²/ s, more preferably 80 to 400 even more preferably 90 to 350mm ²Those of/s.100 ℃ of following kinematic viscosity are lower than 40mm ²The high viscosity ucon oil of/s is not preferred, and performance is less with the effect of initial extreme pressure property because it improves fatigue lifetime.100 ℃ of following kinematic viscosity are 500mm ²/ s or lower high viscosity synthetic oil can provide have improved fatigue lifetime performance and life-time service after the lubricating oil composition of extreme pressure property.

The viscosity index of described high viscosity ucon oil does not have particular restriction.But described viscosity index be preferably 150 or higher, more preferably 160 or higher, and be preferably 400 or lower, more preferably 280 or lower, preferred especially 260 or lower.Pour point there is not particular restriction.But pour point be preferably-10 ℃ or lower, more preferably-20 ℃ or lower, preferred-30 ℃ or lower especially, thereby can the low-temperature performance of lubricating oil composition not had a negative impact.

If blending, the amount of above-mentioned high viscosity synthetic oil is preferably 1 to 15 quality %, more preferably 2 to 10 quality %, based on the base oil total amount, although viscosity is low to have excellent fatigue lifetime of a performance and have the lubricating oil composition for transmission of excellent extreme pressure property in the early stage with behind the life-time service to provide.

Described high viscosity synthetic oil can be two or the mixture of multiple high viscosity synthetic oil.The ratio of mixture of this mixture can be selected arbitrarily.

The specific examples of described high viscosity ucon oil comprises that 100 ℃ of following kinematic viscosity are 40 to 500mm ²Those of/s, for example isoparaffin, alkylbenzene, alkylnaphthalene, polyester, poly suboxygen alkyl glycol, dialkyl group phenyl ether and polyphenylene oxide.

The specific examples of polyester based lubricating oil includes the ester of the polyvalent alcohol of neopentyl structure such as neopentyl glycol, TriMethylolPropane(TMP) and tetramethylolmethane and monocarboxylic acid or polycarboxylic acid and makes these type of monocarboxylic ester or polycarboxylic acid is adjusted to 40 to 500mm through esterification or transesterification reaction and the polymerization degree of the regulating products therefrom kinematic viscosity under with 100 ℃ ²The mixed ester that/s obtains.Can contain oxirane or polyalkylene oxide in the molecule of described polyester based lubricating oil.

Monocarboxylic example comprises straight chain fatty acid such as butyric acid, valeric acid, caproic acid, enanthic acid, sad, n-nonanoic acid, capric acid, lauric acid, tetradecanoic acid, palmitinic acid, stearic acid, oleic acid, linolic acid, linolenic acid and erucic acid; Branching lipid acid such as 2 ethyl hexanoic acid, isocaprylic acid, different n-nonanoic acid, isodecyl acid, different lauric acid, different tetradecanoic acid, different palmitinic acid, Unimac 5680, different eicosanoic acid, the synthetic fatty acid that obtains by Ke Hefa and by the Guerbet method by the synthol derived fatty acid; And composition thereof.

The example of polycarboxylic acid comprises diprotic acid such as oxalic acid, propanedioic acid, succsinic acid, pentanedioic acid, hexanodioic acid, pimelic acid, nonane diacid, sebacic acid, dodecane-1,12-dioctyl phthalate, undecane dicarboxylic acid, dimeracid, phthalic acid, m-phthalic acid and terephthalic acid; Triprotic acid such as propylene-1,2,3-tricarboxylic acid, propane-1,2,3-tricarboxylic acid, 2-hydroxypropyl alkane-1,2,3-tricarboxylic acid, 4-hydroxyl pentane-1,3,4-tricarboxylic acid, 2-hydroxyl heptadecane-1,2,3-tricarboxylic acid, hemimellitic acid, trihemellitic acid and trimesic acid; Benzene connects tetracid; The inclined to one side tetracid of benzene; Pyromellitic acid; And composition thereof.Particularly preferably be diprotic acid such as hexanodioic acid, nonane diacid, dodecane-1,12-dioctyl phthalate and dimeracid.

Carboxylicesters and multi-carboxylate's example comprises the ester of above-mentioned carboxylic acid or polycarboxylic acid and lower alcohol such as methyl alcohol, ethanol and octanol.

The production method of above-mentioned mixed ester can be under 100 to 250 ℃, preferred 140 to 240 ℃ temperature one or multistep in carry out above-mentioned reaction and by steaming unreacted product, remove catalyzer and the washing back makes the resultant product thermal dehydration purify under vacuum.This method can be carried out as the azeotropic dehydration solvent with toluene, benzene or dimethylbenzene.In addition, described reaction can be at inert atmosphere as for removing under the nitrogen that reaction water introduces or carrying out under vacuum.The catalyzer that can be used for this method is acid catalyst such as sulfuric acid and tosic acid, alkaline catalysts such as potassium oxide, Lithium Oxide 98min and lithium acetate and metal oxide such as zinc oxide.

The example of poly suboxygen alkyl glycol comprise by have 2 to 10, the alkylene oxide of preferred 3 to 5 carbon atoms such as oxyethane, propylene oxide, trimethylene oxide, butylene oxide ring, Alpha-Methyl-trimethylene oxide, 3,3 '-dimethyl trimethylene oxide, tetrahydrofuran (THF), dioxan and composition thereof ring-opening polymerization or copolymerization are to be adjusted to 40 to 500mm by the selective polymerization degree with the kinematic viscosity under 100 ℃ ²/ s synthetic those as polyoxypropylene glycol, or alkyl oxide, aryl ethers, alkyl aryl ether and the aralkyl ethers of poly suboxygen alkyl glycol ethers class poly suboxygen alkyl like this glycol have the substituting group of 1 to 20 carbon atom.

Be extreme pressure property, resistance to abrasion or the low-temperature fluidity behind further enhancing performance fatigue lifetime, the life-time service, lubricating oil composition for transmission of the present invention can comprise non-dispersive type viscosity index improver and/or decentralized viscosity index improver, weight-average molecular weight be 50 000 lower, preferred 40 000 or lower, most preferably 10 000 to 35 000.

The specific examples of non-dispersive type viscosity index improver comprises (E-1) monomeric homopolymer of being selected from compound shown in following formula (8), (9) and (10), two or multiple (E-1) monomeric multipolymer and hydride thereof:

The specific examples of decentralized viscosity index improver comprises two or multiple (E-2) monomeric multipolymer and the hydride thereof that is selected from compound shown in following formula (11) and (12); Be selected from (E-1) monomer and one or more (E-2) the monomeric multipolymer and hydride thereof that is selected from compound shown in following formula (11) and (12) of compound shown in following formula (8), (9) and (10) with one or more:

In the following formula (8), R ¹Be hydrogen or methyl, R ²For hydrogen or the alkyl of 1 to 18 carbon atom is arranged.

Be used for R ²The specific examples of the alkyl that 1 to 18 carbon atom is arranged comprise the straight or branched alkyl, for example methyl, ethyl, propyl group, butyl, amyl group, hexyl, heptyl, octyl group, nonyl, decyl, undecyl, dodecyl, tridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl and octadecyl.

In the following formula (9), R ³Be hydrogen or methyl, R ⁴For hydrogen or the alkyl of 1 to 12 carbon atom is arranged.

Be used for R ⁴The specific examples of the alkyl that 1 to 12 carbon atom is arranged comprise alkyl, can be straight or branched, for example methyl, ethyl, propyl group, butyl, amyl group, hexyl, heptyl, octyl group, nonyl, decyl, undecyl and dodecyl; The cycloalkyl that 5 to 7 carbon atoms are arranged, for example cyclopentyl, cyclohexyl and suberyl; The alkyl-cycloalkyl that 6 to 11 carbon atoms are arranged, wherein said alkyl can be bonded in any position of cycloalkyl, for example methylcyclopentyl, dimethylcyclopentyl, methylethyl cyclopentyl, diethyl cyclopentyl, methylcyclohexyl, Dimethylcyclohexyl, methylethyl cyclohexyl, diethyl cyclohexyl, methyl suberyl, dimethyl suberyl, methylethyl suberyl and diethyl suberyl; Alkenyl can be a straight or branched, and the position of its pair key can change, for example butenyl, pentenyl, hexenyl, heptenyl, octenyl, nonene base, decene base, undecenyl and dodecenyl succinic; Aryl such as phenyl and naphthyl; The alkaryl that 7 to 12 carbon atoms are arranged, wherein said alkyl can be straight or branched and any position that can be bonded in aryl, for example tolyl, xylyl, ethylbenzene base, propyl phenyl, butylbenzene base, penta phenyl and own phenyl; With the aralkyl that 7 to 12 carbon atoms are arranged, wherein said alkyl can be a straight or branched, for example benzyl, styroyl, hydrocinnamyl, benzene butyl, benzene amyl group and benzene hexyl.

In the following formula (10), X ¹And X ²All be hydrogen, formula-OR independently ⁹The alkoxyl group of 1 to 18 carbon atom that is shown with (R wherein ⁹For the alkyl of 1 to 18 carbon atom is arranged) or formula-NHR ¹⁰The alkyl monosubstituted amino of 1 to 18 carbon atom that is shown with (R wherein ¹⁰For the alkyl of 1 to 18 carbon atom is arranged).

In the following formula (11), R ⁵Be hydrogen or methyl, R ⁶For the alkylidene group of 1 to 18 carbon atom, Y are arranged ¹For the amine residue or 1 or 2 nitrogen is arranged and the heterocycle residue of 0 to 2 oxygen, m is 0 or 1 integer.

Be used for R ⁶The specific examples of the alkylidene group that 1 to 18 carbon atom is arranged comprise ethylidene, propylidene, butylidene, pentylidene, hexylidene, inferior heptyl, octylene, nonamethylene, inferior decyl, inferior undecyl, inferior dodecyl, inferior tridecyl, inferior tetradecyl, inferior pentadecyl, inferior hexadecyl, inferior heptadecyl and inferior octadecyl, all can be straight or branched.

Y ¹Shown in the specific examples of group comprise dimethylamino, diethylin, dipropyl amino, dibutylamino, phenylamino, toluino, dimethylbenzene amino, kharophen, benzil amino, morpholino, pyrryl, pyrrolinyl, pyridyl, picolyl, pyrrolidyl, piperidyl, quinonyl, pyrrolidone-base, pyrrolidone also (pyrrolidono), imidazolinyl (imidazolino) and pyrazinyl (pyrazino).

In the formula (12), R ⁷Be hydrogen or methyl, Y ²For the amine residue or 1 or 2 nitrogen is arranged and the heterocycle residue of 0 to 2 oxygen.

Y ²Shown in the specific examples of group comprise dimethylamino, diethylin, dipropyl amino, dibutylamino, phenylamino, toluino, dimethylbenzene amino, kharophen, benzil amino, morpholino, pyrryl, pyrrolinyl, pyridyl, picolyl, pyrrolidyl, piperidyl, quinonyl, pyrrolidone-base, pyrrolidone also (pyrrolidono), imidazolinyl (imidazolino) and pyrazinyl (pyrazino).

The preferred example of monomer (E-1) includes the alkyl acrylate of 1 to 18 carbon atom; The alkyl methacrylate that 1 to 18 carbon atom is arranged; Alkene, vinylbenzene, vinyl toluene, maleic anhydride ester and maleic anhydride acid amides (2 to 20 carbon atoms are all arranged), and composition thereof.

The preferred example of monomer (E-2) comprise dimethylaminoethyl acrylate methyl amino methyl, methacrylic acid diethylin methyl esters, dimethylaminoethyl methacrylate, diethylaminoethyl methacrylate, 2-methyl-5-vinylpyrine, methacrylic acid morpholino methyl esters, methacrylic acid morpholino ethyl ester, N-vinyl pyrrolidone, and composition thereof.

When being selected from one or more monomer of (E-1) compound and being selected from one or more monomer copolymerization of (E-2) compound, copolymerization mol ratio " (E-1): (E-2) " is in 80: 20 to 95: 5 scope.Though copolymerization process does not have particular restriction, make monomer (E-1) and monomer (E-2) at polymerization starter this multipolymer of easy acquisition as free radical solution polymerization in the presence of the benzoyl peroxide.

But the specific examples of the viscosity index improver of blending comprises non-dispersive type or decentralized polymethacrylate, non-dispersive type or decentralized ethene-alpha-olefin copolymer and hydride, polyisobutene and hydride thereof, vinylbenzene-hydrogenated diene copolymer, vinylbenzene-maleic anhydride ester copolymer and polyoxyethylene alkylphenyl ethene in the lubricating oil composition of the present invention.

Can be that number-average molecular weight is 2 000 to 20 000, preferred 10 000 to 18 500 ethene-alpha-olefin copolymer with the preferred viscosity index improver of lubricating oil composition compounding of the present invention, because of its of improvement in performance works very well fatigue lifetime; With polymethacrylate base viscosity index improver, because of its low-temperature fluidity better.

When described viscosity index improver and lubricating oil composition blend of the present invention, the amount of described improving agent is 0.1 to 15 quality %, preferred 0.5 to 5 quality %, based on total composition.It is not preferred that the amount of viscosity index improver surpasses 15 quality %, because cause being difficult to keep for a long time the initial extreme pressure property of composition.

The preferred blending of lubricating oil composition of the present invention is selected from ashless dispersant, alkaline-earth metal-based purification agent, antioxidant and friction modifiers.

The example of ashless dispersant comprises following nitrogen compound (can be used alone or in combination):

(F-1) there is at least one that the alkyl of 40 to 400 carbon atoms or the succinimide and the derivative thereof of alkenyl are arranged in the molecule;

(F-2) there is at least one that the alkyl of 40 to 400 carbon atoms or the benzylamine and the derivative thereof of alkenyl are arranged in the molecule; With

(F-3) there is at least one that the alkyl of 40 to 400 carbon atoms or the polyamines and the derivative thereof of alkenyl are arranged in the molecule.

(F-1) specific examples of succinimide comprises compound shown in formula (13) and (14):

In the formula (13), R ³¹For have 40 to 400, the alkyl or the alkenyl of preferred 60 to 350 carbon atoms, a is 1 to 5, preferred 2 to 4 integer.

In the formula (14), R ³²And R ³³All independently for have 40 to 400, the alkyl or the alkenyl of preferred 60 to 350 carbon atoms, b is 0 to 4, preferred 1 to 3 integer.

Above-mentioned succinimide comprise succinyl oxide wherein by imidization add to the succinimide of monotype as the formula (13) of polyamines one end and wherein succinyl oxide add to the succinimide of dimorphism as the formula (14) at polyamines two ends by imidization.Lubricating oil composition of the present invention can comprise succinimide or its mixture of arbitrary type.

(F-2) specific examples of benzylamine comprises compound shown in the formula (15):

In the formula (15), R ³⁴For have 40 to 400, the alkyl or the alkenyl of preferred 60 to 350 carbon atoms, c is 1 to 5, preferred 2 to 4 integer.

Above-mentioned benzylamine can obtain alkylphenol by polyolefine such as propylene oligomer, polybutene or ethene-alpha-olefin copolymer and phenol reactant makes alkylphenol and formaldehyde and polyamines such as diethylenetriamine, Triethylenetetramine (TETA), tetren or penten obtain through Mannich reaction then.

(F-3) specific examples of polyamines comprises compound shown in the formula (16):

R ³⁵-NH-(CH ₂CH ₂NH) _d-H (16)

In the formula (16), R ³⁵For have 40 to 400, the alkyl or the alkenyl of preferred 60 to 350 carbon atoms, d is 1 to 5, preferred 2 to 4 integer.

Above-mentioned polyamines can be by making polyolefine such as propylene oligomer, polybutene or ethene-alpha-olefin copolymer chlorination and making the chlorating polyolefine and ammonia or polyamines such as quadrol, diethylenetriamine, Triethylenetetramine (TETA), tetren and five inferior ethene hexamine reaction productions.

The nitrogen content of above-mentioned nitrogen compound does not have particular restriction.But for resistance to abrasion, oxidative stability and frictional behaviour, described nitrogen content is preferably 0.01 to 10 quality %, more preferably 0.1 to 10 quality %.

The example of the derivative of above-mentioned nitrogen compound comprises the arbitrary of above-mentioned nitrogenous compound and the monocarboxylic acid such as the lipid acid of 2 to 30 carbon atoms is arranged or the polycarboxylic acid of 2 to 30 carbon atoms is arranged such as the sour modified compound that oxalic acid, phthalic acid, trihemellitic acid and pyromellitic acid reaction obtain remaining amino and/or all or part of neutralization of imino-or amination; The boron modified compound that the arbitrary and acid reaction of above-mentioned nitrogenous compound obtains remaining amino and/or all or part of neutralization of imino-or amination; The sulphur modified compound that the arbitrary and sulphur compound reaction of above-mentioned nitrogenous compound obtains; Make up the modified product that obtains with two or multiple modification of the sour modification of being selected from of above-mentioned nitrogenous compound, boron modification and sulphur modification.

The amount of ashless dispersant does not have particular restriction.But this amount is preferably 0.5 to 10.0 quality %, more preferably 1 to 8.0 quality %.Ashless dispersant is less than 0.5 quality % can not improve performance and extreme pressure property fatigue lifetime, and ashless dispersant is extremely harmful to the low-temperature fluidity of resulting composition more than 10.0 quality %.

In the present composition blending alkaline-earth metal-based purification agent can improve fatigue lifetime performance and initial stage and life-time service after extreme pressure property.

Can be used for alkaline-earth metal-based purification agent of the present invention preferably base number be 20 to 450mgKOH/g, the basic metal purification agent of preferred 50 to 400mg KOH/g.The base number that JIS K2501 the 7th part " mensuration of petroleum products and lubricant-neutralization value " is measured by the perchloric acid potentiometric titration is pressed in term used herein " base number " representative.The alkaline-earth metal-based purification agent that base number is lower than 20mg KOH/g is not enough to improve performance and extreme pressure property fatigue lifetime, thereby and base number is higher than the alkaline-earth metal-based purification agent of 450mgKOH/g makes the structural instability of composition damage its stability in storage.

Base number is that the specific examples of the alkaline-earth metal-based purification agent of 20 to 450mg KOH/g comprises (F-4) alkaline earth metal sulfonate, (F-5) alkaline-earth metal phenates and (F-6) alkaline-earth metal salicylate.Can use one or more of these purification agents among the present invention.

(F-4) specific examples of alkaline earth metal sulfonate comprises that molecular weight is alkaline earth salt, preferably magnesium and/or the calcium salt of the alkyl aromatic sulfonic acid that obtains of 100 to 1500, preferred 200 to 700 alkyl-aromatic compounds sulfonation.The specific examples of aryl aromatic sulfonic acid comprises mahogany acid and synthetic sulfonic acid.

Mahogany acid can be those that contained alkyl-aromatic compounds sulfonation obtains in the lubricant cut of mineral oil or the sulfonic acid by product when producing white oil.Synthetic sulfonic acid can be alkylbenzene that the straight or branched alkyl is arranged (as produce as by product in the alkylbenzene production unit of detergent feedstocks or make polyolefine be alkylated into benzene to obtain) sulfonation obtain those, or the sulfonation of dinonyl naphthalene obtain those.Making the used sulphonating agent of these alkyl-aromatic compounds sulfonation can be oleum and sulfuric acid.

The alkaline earth salt of the Mannich reaction products that the alkylphenol sulfide that (F-5) specific examples of alkaline-earth metal phenates includes at least one 4 to 30, alkylphenol, this alkylphenol and the reaction of Salmon-Saxl of the straight or branched alkyl of preferred 6 to 18 carbon atoms obtain or this alkylphenol and formaldehyde reaction obtain, preferred magnesium salts or calcium salt.

(F-6) the alkaline-earth metal salicylate specific examples include at least one and have 4 to 30, the alkaline earth salt of the alkyl salicylate of the straight or branched alkyl of preferred 6 to 18 carbon atoms, preferred especially magnesium salts and/or calcium salt.

As long as above-mentioned alkaline earth metal sulfonate, phenates and salicylate all have 20 to 450mgKOH/g base number, and they can be alkyl aromatic sulfonic acid, alkylphenol, alkylphenol sulfide, the Mannich reaction products of alkylphenol or alkyl salicylate are directly and the oxide compound direct reaction of alkaline earth metal alkali such as alkaline earth metal oxide or magnesium and/or calcium or make alkyl aromatic sulfonic acid, alkylphenol, alkylphenol sulfide, the Mannich reaction products of alkylphenol or alkyl salicylate change into an alkali metal salt such as sodium salt or sylvite and replace the neutral salt (normal salt) that an alkali metal salt obtains with alkaline earth salt then; This neutral salt and excessive alkaline earth salt or alkaline earth metal alkali (alkaline earth metal hydroxides or oxide compound) heat the subsalt that obtains in the presence of water; In the presence of carbonic anhydride, react the high alkalinity salt that obtains with this neutral salt and alkaline earth metal alkali.These reactions are carried out in solvent (aliphatic hydrocarbon solvent such as hexane, aromatic solvent such as dimethylbenzene and light lubricating base oil) usually.Though metal detergent is purchased with light lubricating base oil dilute form usually, preferably use metal content this metal detergent in 1.0 to 20 quality %, preferred 2.0 to 16 quality % scopes.

The amount of alkaline-earth metal-based purification agent does not have particular restriction.But this amount is preferably 0.05 to 4.0 quality %, more preferably 0.1 quality % and 3.0 quality % or lower, preferred 1 quality % or lower, preferred especially 0.5 quality % or lower.The alkaline-earth metal-based purification agent that is lower than 0.05 quality % is not enough to improve performance and extreme pressure property fatigue lifetime, and more than 4.0 quality % the oxidative stability of resulting composition is reduced.

Qualified antioxidant is phenol-based anti-oxidants and amido antioxidant, as long as general in lubricating oil.Preferably combination is used.

The specific examples of this type of antioxidant comprises alkylphenol as 2,6-di-t-butyl-4-sylvan; Bis-phenol such as methylene radical-4,4-bis-phenol (2,6-di-t-butyl-4-sylvan); Naphthylamines class such as phenyl-a-naphthylamine; The dialkyl group diphenylamine; Zinc dialkyl dithiophosphate is as two-2-ethylhexyl zinc dithiophosphate; (3,5-di-t-butyl-4-hydroxyphenyl) lipid acid (propionic acid) or (the 3-methyl-5-tertiary butyl-4-hydroxyphenyl) lipid acid (propionic acid) and monobasic or polyvalent alcohol such as methyl alcohol, octanol, Stearyl alcohol, 1, the ester of 6-hexylene glycol, neopentyl glycol, thiodiglycol, triglycol and tetramethylolmethane.

One or more compound that is selected from these antioxidants can any amount blending, but the blending amount is 0.01 to 5.0 quality % usually.

Friction modifiers is friction modifiers arbitrary who is used for lubricating oil, but be preferably amine compound, imide compound, fatty acid ester, fatty acid amide or fatty acid metal salt, its intramolecularly all has the alkyl that contains 6 to 30 carbon atoms or alkenyl, especially preferably contains the straight chained alkyl or the alkenyl of 6 to 30 carbon atoms.

The example of described amine compound includes the straight or branched of 6 to 30 carbon atoms, preferred linear aliphatic monoamine; The straight or branched of 6 to 30 carbon atoms, preferred linear aliphatic polyamines are arranged; Oxirane adducts with this type of aliphatic amine.The example of imide compound includes the straight or branched alkyl of 6 to 30 carbon atoms or succinimide and/or its carboxylic acid, boric acid, phosphoric acid or the sulfuric acid modified product of alkenyl.The example of fatty acid ester includes the ester of the straight or branched of 7 to 31 carbon atoms, preferred straight chain fatty acid and aliphatic monohydric alcohol or aliphatic polyol.The example of fatty acid amide includes the acid amides of the straight or branched of 7 to 31 carbon atoms, preferred straight chain fatty acid and aliphatic monoamine or aliphatic polyamines.The example of fatty acid metal salt includes the straight or branched of 7 to 31 carbon atoms, the alkaline earth salt (magnesium salts or calcium salt) or the zinc salt of preferred straight chain fatty acid.

The present composition preferably comprise be selected from amine-, ester-, acid amides-and one or more friction modifiers of lipid acid-Ji friction modifiers, be preferably selected from especially amine-, acid amides-and one or more friction modifiers of fatty acid-based friction modifiers because they can improve performance fatigue lifetime better.

Be selected from one or more compound of above-mentioned friction modifiers can any amount blending in described composition, but usually with amount blending based on total composition 0.01 to 5.0 quality %, preferred 0.03 to 3.0 quality %.

Be further to strengthen the performance of the present composition, when needing described composition can with various additives except that above-mentioned such as one or more compounding of corrosion inhibitor, rust-preventive agent, emulsion splitter, metal passivator, pour point reducer, swell rubber agent, defoamer and dyestuff.

The example of corrosion inhibitor comprise benzotriazole-, tolyl-triazole-, thiadiazoles-and imidazo-5-yl-compound.

The example of rust-preventive agent comprises petroleum sulfonate, benzene sulfonamide acid esters, dinonylnaphthalene sulfonic acid ester, alkenyl succinate and polyol ester.

The example of emulsion splitter comprises polyalkylene glycol base nonionogenic tenside such as Voranol EP 2001, polyoxyethylene alkyl phenyl ether and polyxyethylated naphthyl ether.

The example of metal passivator comprises tetrahydroglyoxaline, pyrimidine derivatives, alkyl thiadiazoles, mercaptobenzothiazole, benzotriazole and derivative, 1 thereof, 3,4-thiadiazoles polysulfide, 1,3,4-thiadiazolyl group-2, the two dialkyl dithio amino formates of 5-, 2-(alkyl disulfide group) benzoglyoxaline and β-(adjacent carboxyl benzylthio-) propionitrile.

Pour point reducer can be any known pour point reducer according to the lubricating base oil type selecting, but preferably weight-average molecular weight be higher than 50 000 and be less than or equal to 150 000, preferred 80000 to 120 000 polymethacrylate.

Defoamer can be any compound that is commonly used for lubricating oil antifoams, comprises siloxanes such as dimethyl siloxane and fluorosilicone.One or more of optional class siloxanes since then can any amount compounding.

Dyestuff can be any compound that is commonly used for the lubricating oil dyestuff, can any amount compounding, but be generally 0.001 to 1.0 quality %, based on total composition.

When comprising these additives in the lubricating oil composition of the present invention, the content of corrosion inhibitor, rust-preventive agent and emulsion splitter is 0.005 to 5 quality %, the content of metal passivator is 0.005 to 1 quality %, the content of pour point reducer is 0.05 to 1 quality %, the content of defoamer is 0.0005 to 1 quality %, the content of dyestuff is 0.001 to 1.0 quality %, based on total composition.

For fatigue lifetime performance and oxidation stabilizer, total sulfur content (total amount of institute's sulfur-bearing in extreme-pressure additive, lubricating base oil and other additive) is 0.05 to 0.3 quality %, preferred 0.1 to 0.2 quality %, preferred especially 0.12 to 0.18 quality %.

Phosphorus content in the present composition (contained in the extreme-pressure additive) must be 0.10 to 0.40, preferred 0.12 to 0.3, more preferably 0.15 to 0.25 with the mass ratio (P/S) of total sulfur content.

There is the lubricating oil composition for transmission of the present invention of said components can provide excellent performance fatigue lifetime because of the said components structure.But automatic, stepless or manual gear shifting is low with the traditional lubrication oil compositions because of stirring resistance ratios, be the fuel economy of further improving the present composition, the kinematic viscosity of the present composition under 100 ℃ is preferably 10mm ²/ s or lower, more preferably 8mm ²/ s or lower even more preferably 7mm ²/ s or lower, preferred especially 6.5mm ²/ s or lower.The kinematic viscosity of described composition under 40 ℃ is preferably 40mm ²/ s or lower, more preferably 35mm ²/ s or lower, preferred especially 30mm ²/ s or lower.For further improving the extreme pressure property of automatic transmission, stepless speed change device and manual gear shifting, the kinematic viscosity of described composition under 100 ℃ is preferably 3mm ²/ s or higher, more preferably 4mm ²/ s or higher, preferred especially 5mm ²/ s or higher, the kinematic viscosity of described composition under 40 ℃ is preferably 15mm ²/ s or higher, more preferably 20mm ²/ s or higher.

Lubricating oil composition for transmission of the present invention have low viscosity but fatigue lifetime performance, low temperature viscosity and oxidative stability still fabulous, and can reduce and stir resistance due to the lubricating oil.Thereby, use the present composition to help to improve the fuel economy of automobile in the final drive reduction device of or manual gear shifting or automobile particularly automatic, stepless at automobile speed-changing device.

Preferred forms

Describe the present invention in more detail below by following examples and Comparative Examples, these embodiment should not be construed as and limit the scope of the invention.

(embodiment 1 to 9 and Comparative Examples 1 to 3)

Make various lubricating base oils shown in the following table 1 and additive compounding prepare lubricating oil composition of the present invention (embodiment 1 to 9) and be used for correlated lubricating oil composition (Comparative Examples 1 to 3).Various content of additive are all based on total composition.

Estimate performance fatigue lifetime of resulting composition by fatigue life test described in following (1).Evaluation result also is shown in Table 1.

(embodiment 10 to 17, reference example 1 and Comparative Examples 4 to 7)

Make various lubricating base oils shown in the following table 2 and additive compounding prepare lubricating oil composition of the present invention (embodiment 10 to 17), be used for the lubricating oil composition (reference example 1) of reference and be used for correlated lubricating oil composition (Comparative Examples 4 to 7).Various content of additive are all based on total composition.

Estimate performance fatigue lifetime, low temperature viscosity and the oxidative stability of resulting composition to method described in (3) by following (1).Evaluation result also is shown in Table 2.

(1) fatigue life test

The following rolling contact fatigue tester of using is measured fatigue lifetime.

(bearing)

Material: bearing steel

Sample: φ 60mm * 5mm is thick

Test steel ball: φ 3/8in.

Revolution: 1800rpm

Oil temperature: 150 ℃

Surface pressure: 6.4GPa

(judgement criteria)

Surface damage occurs and be assessed as fatigue lifetime, calculate L50 (on average) by 6 test-results as the used time before jolting.

(2) brookfield viscosity

Press ASTM D 2983 and measure the brookfield viscosity of each composition under-40 ℃.The result also is shown in Table 2.-40 ℃ of following brookfield viscosities are that 20 000mPas or lower composition are considered as the low temperature viscosity excellence.

(3) oxidative stability

In 165.5 ℃ of following ISOT tests, force each composition rotten by JIS K 2514, the increase of measuring acid number after 72 hours.Acid number increases few composition and is considered as the oxidative stability excellence.

Table 1

In the table 1 1) refer to 17:

1) hydrocracking base oil (100 ℃ of following kinematic viscosity: 2.6mm ²/ s, %C _N: 20, sulphur content:＜0.001 quality %, viscosity index: 105)

2) hydrocracking base oil (100 ℃ of following kinematic viscosity: 4.2mm ²/ s, %C _N: 22, sulphur content:＜0.001 quality %, viscosity index: 125)

3) naphthyl base oil (100 ℃ of following kinematic viscosity: 3.7mm ²/ s, %C _N: 46, sulphur content: 0.06 quality %, viscosity index: 51)

4) poly-alpha olefins base base oil (100 ℃ of following kinematic viscosity: 6.0mm ²/ s, sulphur content: 0.000 quality %, viscosity index: 133)

5) solvent-refined base oil (100 ℃ of following kinematic viscosity: 10.84mm ²/ s, %C _N: 25, sulphur content: 0.6 quality %, viscosity index: 97)

6) solvent-refined base oil (100 ℃ of following kinematic viscosity: 31.4mm ²/ s, %C _N: 23, sulphur content: 0.5 quality %, viscosity index: 97)

7) phosphorous acid two-2-ethylhexyl (phosphorus content: 10.1 quality %)

8) trilauryl trithiophosphite (phosphorus content: 4.9 quality %, sulphur content: 15.7 quality %)

9) olefine sulfide (sulphur content: 46 quality %)

10) thiadiazoles (sulphur content: 36 quality %)

11) polymethacrylate (weight-average molecular weight: 50 000)

12) polybutylene-based succinimide (dimorphism)

13) boric acid modified polybutylene-based succinimide (dimorphism)

14) calcium sulphonate (base number: 300mgKOH/g)

15) amido

16) dialkyl group diphenylamine

17) polydimethylsiloxane

Table 2

In the ※ table 2 1) refer to 27:

1) hydrocracking base oil (100 ℃ of following kinematic viscosity: 2.6mm ²/ s, %C _N: 20, sulphur content:＜0.001 quality %, viscosity index: 105)

2) hydrocracking base oil (100 ℃ of following kinematic viscosity: 4.2mm ²/ s, %C _N: 22, sulphur content:＜0.001 quality %, viscosity index: 125)

3) hydrocracking base oil (100 ℃ of following kinematic viscosity: 6.2mm ²/ s, %C _N: 22, sulphur content: 0.001 quality %, viscosity index: 132)

4) poly-alpha olefins base base oil (100 ℃ of following kinematic viscosity: 6.0mm ²/ s, sulphur content: 0.000 quality %, viscosity index: 133)

5) poly-alpha olefins base base oil (100 ℃ of following kinematic viscosity: 1.9mm ²/ s, sulphur content: 0.000 quality %, viscosity index: 100)

6) solvent-refined base oil (100 ℃ of following kinematic viscosity: 10.84mm ²/ s, %C _N: 25, sulphur content: 0.6 quality %, viscosity index: 97)

7) solvent-refined base oil (100 ℃ of following kinematic viscosity: 21.9mm ²/ s, %C _N: 22, sulphur content: 0.91 quality %, viscosity index: 95)

8) poly-alpha olefins base base oil (100 ℃ of following kinematic viscosity: 100mm ²/ s, sulphur content: 0.000 quality %, viscosity index: 156, number-average molecular weight: 4000)

9) ethene-alpha-olefin copolymer base base oil (100 ℃ of following kinematic viscosity: 100mm ²/ s, number-average molecular weight: 1 500)

10) ethene-alpha-olefin copolymer base base oil (100 ℃ of following kinematic viscosity: 600mm ²/ s, number-average molecular weight: 2 500)

11) ethene-alpha-olefin copolymer base base oil (100 ℃ of following kinematic viscosity: do not measure number-average molecular weight: 1 800)

12) ethene-alpha-olefin copolymer base base oil (100 ℃ of following kinematic viscosity: do not measure number-average molecular weight: 25000)

13) phosphorous acid two-2-ethylhexyl (phosphorus content: 10.1 quality %)

14) olefine sulfide (sulphur content: 46 quality %)

15) thiadiazoles (sulphur content: 36 quality %)

16) polymethacrylate (weight-average molecular weight: 50 000)

17) polymethacrylate (weight-average molecular weight: 100 000)

18) polybutylene-based succinimide (dimorphism)

19) boric acid modified polybutylene-based succinimide (dimorphism)

20) calcium sulphonate (base number: 300mgKOH/g)

21) amido

22) fatty acid-based

23) ester group

24) amide group

25) dialkyl group diphenylamine

26) hindered phenol

27) polydimethylsiloxane

From result shown in the table 1 as seen, described lubricating oil composition (embodiment 1 to 9) demonstrates excellent performance fatigue lifetime.

Particularly, at the %C of component (A) _NTransfer to 17-30, phosphorus base stage and press additive and the combination of sulfenyl extreme-pressure additive to transfer under the situation of 0.15-0.25 (embodiment 1,2 and 5 to 8) as P/S ratio in component (D) and the composition, its composition has that (wherein P/S is than less than 0.15 embodiment 3, the %C of component (A) wherein than those _NEmbodiment 4 less than 17 and wherein use the embodiment 9 of phosphorus-sulfenyl extreme-pressure additive) more excellent performance fatigue lifetime.P/S is than the %C for 0.19-0.23 or component (A) in composition _NBe 23 or the situation of bigger (embodiment 5 and 7) under, its composition has excellent especially performance fatigue lifetime.

Obviously composition (Comparative Examples 1), its total sulfur content of not containing component (B) only are that no sulphur extreme-pressure additive and P/S have relatively poor performance fatigue lifetime than the composition (Comparative Examples 3) greater than 0.40 greater than composition (Comparative Examples 2) and the component (D) of 0.3 quality %.

From result shown in the table 2 as seen, lubricating oil composition for transmission of the present invention (embodiment 10 to 17) demonstrates excellent performance fatigue lifetime, low temperature viscosity and oxidative stability.

Particularly, transfer to 5-6.5mm 100 ℃ of following kinematic viscosity ²Adding 100 ℃ of following kinematic viscosity in the composition of/s is 21.9mm ²/ s and sulphur content are that it is 10.84mm that performance ratio fatigue lifetime of resulting composition comprises 100 ℃ of following kinematic viscosity under the situation of solvent treatment mineral oil B as component (B) (embodiment 13 to 17) of 0.91 quality % ²/ s and sulphur content be the composition (embodiment 10 and 12) of the solvent treatment mineral oil A of 0.6 quality % improve and demonstrate with 100 ℃ of following kinematic viscosity greater than 6mm ²Equal or higher performance fatigue lifetime of the composition of/s (embodiment 11).The effect that the middle ethene-alpha-olefin copolymer of component (C) improves performance fatigue lifetime is fabulous, and its molecular weight is big more, improves performance fatigue lifetime (embodiment 14 and 15) more.In addition, the composition (embodiment 15 and 16) that comprises amido friction modifiers, fatty acid-based friction modifiers or amide group friction modifiers can improve performance fatigue lifetime better than (embodiment 17) that comprise the ester group friction modifiers.The composition (embodiment 13 to 17) that comprises phenol-based anti-oxidants and amido antioxidant can improve oxidative stability better.

Not containing component (C) and containing weight-average molecular weight is that the composition (reference example 1) of 50 000 polymethacrylate only makes the fatigue lifetime performance be improved but do not obtain the beneficial effect that the present invention realizes by adding component (B).The number-average molecular weight that does not contain component (B) (Comparative Examples 4), comprises more than 15 quality % is lower than 2 000 component (C) (Comparative Examples 5) and comprises the weak effect that poly-alpha olefins base base oil replaces composition improvement performance fatigue lifetime of component (A) (Comparative Examples 7).In addition, molecular weight is not preferred greater than 20 000 component (C), even if because the component (C) of blending 0.5 quality % only, the brookfield viscosity under-40 ℃ also surpasses 20 000mPas (Comparative Examples 6).

Industrial applicibility

Have the lubricating oil composition for transmission of the present invention of said components structure can reduce gear, The stirring resistance of transmission clutch, fluid torque-converter and oil pump. Thereby said composition can make change Speed variator or final drive reduction device help to improve fuel economy, and bearing or gear Performance fatigue life, low temperature viscosity and oxidation stability also fabulous, economical as fresh fuel Lubricating oil composition for transmission is very effective.

Claims (13)

1. lubricating oil composition for transmission comprises: the 100 ℃ of following kinematic viscosity that transfer to that contain (A) 60 to 95 quality % (based on the base oil total amount) are 1.5 to 5mm ²/ s and %C _NBe 10 to 60 lubricating base oil and (B) 100 ℃ of following kinematic viscosity of 5 to 40 quality % (based on the base oil total amount) be 10 to 50mm ²/ s and sulphur content are the lubricating base oil of the mineral lubricant base oils of 0.3 to 1 quality %, (D) extreme-pressure additive that comprises phosphorus base stage pressure additive, sulfenyl extreme-pressure additive and/or phosphorus-sulfenyl extreme-pressure additive of 0.05 to 2 quality % (based on total composition), the phosphorus content of wherein said composition (P) is 0.01 to 0.05 quality %, total sulfur content (S) is 0.05 to 0.3 quality %, and the P/S ratio is 0.10 to 0.40.

2. lubricating oil composition for transmission comprises: the 100 ℃ of following kinematic viscosity that transfer to that contain (A) 60 to 94 quality % (based on the base oil total amount) are 1.5 to 5mm ²/ s, %C _NBe 10 to 60 and %C _ABe 1 or 100 ℃ of following kinematic viscosity of littler lubricating base oil, (B) 5 to 25 quality % (based on the base oil total amount) be 10 to 50mm ²/ s and sulphur content be the mineral lubricant base oils of 0.3 to 1 quality % and (C) number-average molecular weight of 1 to 15 quality % (based on the base oil total amount) be the lubricating base oil of 2000 to 20000 the synthetic oil of forming by carbon and hydrogen, (D) extreme-pressure additive that comprises phosphorus base stage pressure additive, sulfenyl extreme-pressure additive and/or phosphorus-sulfenyl extreme-pressure additive of 0.05 to 2 quality % (based on total composition), the phosphorus content of wherein said composition (P) is 0.01 to 0.05 quality %, total sulfur content (S) is 0.05 to 0.3 quality %, and the P/S ratio is 0.10 to 0.40.

3. claim 1 or 2 lubricating oil composition for transmission, the wherein %C of component (A) _NBe 17 to 40.

4. the lubricating oil composition for transmission of claim 1, wherein said component (A) and the kinematic viscosity of lubricating base oil (B) under 100 ℃ of comprising is 2.5 to 6mm ²/ s.

5. the lubricating oil composition for transmission of claim 2, wherein said component (A), (B) and the kinematic viscosity of lubricating base oil (C) under 100 ℃ of comprising is 3 to 6mm ²/ s.

6. claim 1 or 2 lubricating oil composition for transmission, the source of wherein said phosphorus is a phosphorous acid ester.

7. claim 1 or 2 lubricating oil composition for transmission, wherein said composition comprises at least a additive that is selected from viscosity index improver, pour point reducer, ashless dispersant, alkaline-earth metal-based purification agent, antioxidant and friction modifiers.

8. claim 1 or 2 lubricating oil composition for transmission, the kinematic viscosity of wherein said composition under 100 ℃ are 3 to 6.5mm ²/ s.

9. claim 1 or 2 lubricating oil composition for transmission, wherein said composition is used for automatic transmission.

10. claim 1 or 2 lubricating oil composition for transmission, wherein said composition is used for manual gear shifting.

11. the lubricating oil composition for transmission of claim 1 or 2, wherein said composition is used for stepless speed change device.

12. one kind improve lubricating oil composition for transmission fatigue lifetime performance method, described lubricating oil composition comprises: the 100 ℃ of following kinematic viscosity that transfer to that contain (A) 60 to 95 quality % (based on the base oil total amount) are 1.5 to 5mm ²/ s and %C _NBe 10 to 60 lubricating base oil and (B) 100 ℃ of following kinematic viscosity of 5 to 40 quality % (based on the base oil total amount) be 10 to 50mm ²/ s and sulphur content are the lubricating base oil of the mineral lubricant base oils of 0.3 to 1 quality %, (D) extreme-pressure additive that comprises phosphorus base stage pressure additive, sulfenyl extreme-pressure additive and/or phosphorus-sulfenyl extreme-pressure additive of 0.05 to 2 quality % (based on total composition), the phosphorus content of wherein said composition (P) is 0.01 to 0.05 quality %, total sulfur content (S) is 0.05 to 0.3 quality %, and the P/S ratio is 0.10 to 0.40.

13. one kind improve lubricating oil composition for transmission fatigue lifetime performance method, described lubricating oil composition comprises: the 100 ℃ of following kinematic viscosity that transfer to that contain (A) 60 to 94 quality % (based on the base oil total amount) are 1.5 to 5mm ²/ s, %C _NBe 10 to 60 and %C _ABe 1 or 100 ℃ of following kinematic viscosity of littler lubricating base oil, (B) 5 to 25 quality % (based on the base oil total amount) be 10 to 50mm ²/ s and sulphur content be the mineral lubricant base oils of 0.3 to 1 quality % and (C) number-average molecular weight of 1 to 15 quality % (based on the base oil total amount) be the lubricating base oil of 2000 to 20000 the synthetic oil of forming by carbon and hydrogen, (D) extreme-pressure additive that comprises phosphorus base stage pressure additive, sulfenyl extreme-pressure additive and/or phosphorus-sulfenyl extreme-pressure additive of 0.05 to 2 quality % (based on total composition), the phosphorus content of wherein said composition (P) is 0.01 to 0.05 quality %, total sulfur content (S) is 0.05 to 0.3 quality %, and the P/S ratio is 0.10 to 0.40.