CN108291169A

CN108291169A - Lubricant composition for internal combustion engine

Info

Publication number: CN108291169A
Application number: CN201680069729.1A
Authority: CN
Inventors: 林诚; 吉田悟
Original assignee: Jxtg Energy Corp
Current assignee: Jxtg Energy Corp
Priority date: 2015-12-01
Filing date: 2016-10-19
Publication date: 2018-07-17
Also published as: US20180320103A1; JP6736037B2; JPWO2017094383A1; WO2017094383A1

Abstract

The present invention provides a kind of lubricant composition for internal combustion engine, contains lube base oil, ashless friction conditioning agent and boron-containing dispersant.

Description

Lubricant composition for internal combustion engine

Technical field

The present invention relates to a kind of lubricant composition for internal combustion engine.

Background technology

In recent years, in order to reduce the CO of motor vehicle emission₂, people seek to improve the lubrication for the internal combustion engines such as automobile engine Province's burnup of oily (machine oil).As the method for the province's burnup for improving machine oil, the lowering viscousity of oil can be enumerated, if but excessively Ground makes its lowering viscousity, then may result in the abrasion of engine.Therefore, people inquire into using addition friction modifier (Friction Modifier) is used as replacement come the method for improving province's burnup.

Such as Patent Document 1 discloses one kind to be contained for the purpose of improving fuel efficiency etc. by reducing friction Specified mineral system base oil and molybdenum dithiocarbamate (Molybdenum Dithiocarbamate) class friction modifier Etc. various additives a kind of diesel engine oil composition.

Patent document

Patent document 1：Japanese Patent Laid-Open 2002-220597 bulletins

Invention content

It is used the purpose of the present invention is to provide a kind of province's burnup or even to the excellent internal combustion engine of the corrosion resistance of copper and lead Lubricant oil composite.

The present invention provides a kind of internal combustion engine use containing lube base oil, ashless friction conditioning agent and boron-containing dispersant Lubricant oil composite.

Lubricant oil composite preferably further contains the parlkaline metal salts of organic acids that alkalization was carried out by line borate.

Lubricant oil composite is suitable as diesel engine oil.

In accordance with the invention it is possible to provide a kind of province's burnup or even moisten to the excellent internal combustion engine of the corrosion resistance of copper and lead Sliding oil composition.

Specific implementation mode

Lubricant oil composite involved by present embodiment contains：Lube base oil, (A) ashless friction conditioning agent (with It is also referred to as " (A) ingredient " down) and (B) boron-containing dispersant (hereinafter also referred to " (B) ingredient ").Profit involved by present embodiment Sliding oil composition is suitable as lubricant composition for internal combustion engine.

Lube base oil is not particularly limited, and can be base oil used in plain oil.Specifically, conduct Lube base oil, can enumerate mineral system base oil, synthetic base oil, or both mixture.

As mineral system base oil, the mineral such as paraffin series, naphthene series system base oil, normal paraffin hydrocarbons, isoparaffin can be enumerated Deng they are obtained in the following manner：Air-distillation and vacuum distillation are carried out to crude oil and obtain lube cut, to above-mentioned Lube cut carry out solvent deasphalting, solvent extraction, be hydrocracked, solvent dewaxing, contact dewaxing, hydrofinishing, sulfuric acid it is clear It washes, one kind in the refinement treatments such as clay treatment or appropriately combined two or more refined and obtain.These mineral system base oils can be single It, can also arbitrary proportion combination be two or more is used solely using a kind of.

As preferred mineral system base oil, base oil below can be enumerated.

(1) distillate oil of paraffin base system crude oil and/or mixing base system crude oil obtained by air-distillation

(2) the vacuum distillation distillate oil (WVGO) of the air-distillation residue oil of paraffin base system crude oil and/or mixing base system crude oil

(3) through wax obtained from lubricating oil dewaxing process and/or through GTL (Gas To Liquid, natural gas synthetic oil) technique etc. And the Fischer-Tropsch wax (Fischer Tropsch Wax) manufactured

(4) mild hydrocracking (the Mild Hy- of the miscella of one or more of above-mentioned (1)~(3) are selected from Drocracking it) handles oily (MHC)

(5) it is selected from the miscella of the two or more oil in above-mentioned (1)~(4)

(6) deasphalted oil (DAO) of above-mentioned (1), (2), (3), (4) or (5)

(7) the mild hydrocracking processing of above-mentioned (6) is oily (MHC)

(8) the two or more miscella of oil etc. that will be selected from above-mentioned (1)~(7) is used as feedstock oil, using common refined The lube cut that method is recycled to the feedstock oil and/or from the feedstock oil refines, and by recycling lube cut Obtained lubricating oil

Herein, it is not particularly limited as common process for purification, essence used when manufacture base oil can be used arbitrarily Method processed.As common process for purification, such as process for purification below can be enumerated.

(a) it is hydrocracked, hydrogenates the hydrofinishings such as modification

(b) furtural solvent extraction equal solvent is refined

(c) dewaxings such as solvent dewaxing, contact dewaxing

(d) the clay-filtered of the progress such as Emathlite, atlapulgite is utilized

(e) drugs such as sulfuric acid cleaned, caustic soda cleaning (acid or alkali) are refined

These process for purification can be used alone, or arbitrarily combines two or more and used with random order.

As synthetic base oil, poly alpha olefin or its hydride, isobutylene oligomer or its hydride, different chain can be enumerated Alkane, alkylbenzene, alkylnaphthalene, diester (glutaric acid two (tridecyl) ester, adipic acid two (2- ethylhexyls) ester, azelaic acid two (2- ethylhexyls) ester, adipic acid diiso decyl ester, adipic acid two (tridecyl) ester, decanedioic acid two (2- ethylhexyls) ester Deng), polyol ester (trimethylolpropane caprylate, trimethylolpropane pelargonate, pentaerythrite -2 ethyl hexanoic acid ester, season penta Tetrol pelargonate etc.), polyether polyols, dialkyl diphenyl ether, polyphenylene oxide etc., wherein preferred poly alpha olefin.As poly- α- Alkene, it can be mentioned, for example carbon atom number be 2 or more 32 hereinafter, preferably the oligomer of 6 or more 16 alpha-olefins below or altogether it is low Polymers (1- octene oligomers, decylene oligomer, ethylene-propylene co-oligomer etc.) and their hydride.These synthesis systems Base oil can be used alone one kind, can also arbitrary proportion combination is two or more is used.

From the viewpoint of making oil film be sufficiently formed, lubricity is better, evaporation loss smaller under the high temperature conditions, moisten Kinetic viscosity of the lubricant base oil at 40 DEG C is preferably 13.0mm²/ s or more, more preferably 15.0mm²/ s or more, further preferably For 17.0mm²/ s or more.From the viewpoint of improving low-temperature viscosity profiles, keeping province's burnup better, lube base oil exists Kinetic viscosity at 40 DEG C is preferably 42.0mm²/ s is hereinafter, more preferably 40.0mm²/ s is hereinafter, further preferably 38.0mm²/s Below.

From the viewpoint of making oil film be sufficiently formed, lubricity is better, evaporation loss smaller under the high temperature conditions, moisten Kinetic viscosity of the lubricant base oil at 100 DEG C is preferably 2.0mm²/ s or more, more preferably 3.0mm²/ s or more, further preferably For 3.5mm²/ s or more.From the viewpoint of improving low-temperature viscosity profiles, keeping province's burnup better, lube base oil exists Kinetic viscosity at 100 DEG C is preferably 8.0mm²/ s is hereinafter, more preferably 7.0mm²/ s is hereinafter, further preferably 6.0mm²/ s with Under.

From making, viscosity-temperature profile, heat/oxidation stability and anti-volatile are good and further decrease friction coefficient From the perspective of, the viscosity index (VI) of lube base oil is preferably 100 or more, and more preferably 110 or more, further preferably 120 or more.From the viewpoint of keeping low-temperature viscosity profiles excellent, the viscosity index (VI) of lube base oil is preferably 180 hereinafter, more Preferably 170 hereinafter, further preferably 160 or less.

Kinetic viscosity and viscosity index (VI) in the present invention are respectively referred to according to JIS K2283:2000 and the kinetic viscosity that measures and viscous Spend index.

The content of lube base oil may be, for example, 50 mass % or more, 70 matter on the basis of lubricant oil composite total amount Measure % or more or 90 mass % or more.

As (A) ashless friction conditioning agent, such as nitrogenous ashless friction conditioning agent, the adjusting of oxygen-containing Ashless friction can be enumerated Agent, preferably nitrogenous ashless friction conditioning agent.Specifically, as (A) ingredient, amine, amide, acid imide, aliphatic acid can be enumerated The compounds such as ester, aliphatic acid, aliphatic alcohol, fatty ether.These compounds are at least containing there are one such as carbon atom numbers 6~30 Alkyl, the preferably alkyl or alkenyl of carbon atom number 6~30, the more preferably straight chained alkyl of carbon atom number 6~30 or straight chain alkene Base.From the viewpoint of keeping province's burnup better, (A) ingredient is preferably selected from amine, amide and aliphatic ester at least One kind being more preferably selected from least one of amine and amide.

As amine, the aliphatic monoamine or aliphatic polyamine and their alkylene oxide of straight-chain or branch-like can be enumerated Adduct.The carbon atom number of these amine may be, for example, 6~30.Amine is preferably the amine represented by following formula (1).

R¹-NH₂(1)

[in formula (1), R¹For the alkyl of carbon atom number 6~30, the preferably alkyl or alkenyl of carbon atom number 6~30, more preferably The straight chained alkyl or straight-chain alkenyl of carbon atom number 6~30.]

As the amine represented by formula (1), specifically, it can be mentioned, for example oleyl amine, octadecylamines.

As amide, the aliphatic acid and aliphatic monoamine or the amide of aliphatic polyamine of straight-chain or branch-like can be enumerated. The carbon atom number of these amides may be, for example, 7~31.Amide is preferably the amide represented by following formula (2).

R¹- C (=O)-NH₂(2)

[in formula (2), R¹It indicates and the R in formula (1)¹Identical definition content.]

As the amide represented by formula (2), specifically, it can be mentioned, for example oleamide, acrylamides.

As aliphatic ester, the aliphatic acid and aliphatic monobasic alcohol or aliphatic polyol of straight-chain or branch-like can be illustrated Ester.Aliphatic acid can be that saturated fatty acid is alternatively unsaturated fatty acid.The carbon atom number of these aliphatic esters may be, for example, 7~ 31.As aliphatic ester, the preferably ester of aliphatic acid and aliphatic polyol, the more preferably aliphatic acid and aliphatic of straight-chain The ester of polyalcohol, the further preferably ester of the unsaturated fatty acid and aliphatic polyol of straight-chain.These aliphatic polybasics The ester of alcohol can be that complete ester is alternatively partial ester, preferably partial ester.As the ester of these aliphatic polyols, specifically, can arrange Citing such as Monoolein.

From the viewpoint of keeping province's burnup better, the content of (A) ingredient is excellent on the basis of lubricant oil composite total amount It is selected as 0.1 mass % or more, more preferably 0.2 mass % or more, further preferably 0.3 mass % or more.From long-term preservation From the perspective of excellent in stability, the content of (A) ingredient on the basis of lubricant oil composite total amount, preferably 0.8 mass % with Under, more preferably 0.7 mass % is hereinafter, further preferably 0.6 mass % or less.From taking into account province's burnup and long-term preservation is steady From the perspective of qualitative, the content of (A) ingredient is on the basis of lubricant oil composite total amount, preferably 0.1~0.8 mass %, 0.1 ~0.7 mass %, 0.1~0.6 mass %, 0.2~0.8 mass %, 0.2~0.7 mass %, 0.2~0.6 mass %, 0.3~ 0.8 mass %, 0.3~0.7 mass % or 0.3~0.6 mass %.

As (B) boron-containing dispersant, succimide, benzyl with the alkenyl or alkyl derived by polyethylene can be enumerated The nitrogenous compounds such as amine, polyamines, Mannich base (Mannich Base), and the borides such as boric acid, borate are acted on this A little nitrogenous compounds and the derivative generated.In them, the borides such as boric acid, borate are preferably acted on into nitrogenous chemical combination Object and the derivative generated.Above-mentioned alkenyl or alkyl can be that straight-chain be alternatively branch-like, can be from acrylic, 1- cyclobutenyls, The oligomer of the alkene such as isobutenyl or branch-like alkyl or branch-like alkenyl derived from the co-oligomer of ethylene and propylene Deng.

As the concrete example of (B) ingredient, modified succinimides can be enumerated, above-mentioned modified succinimides are following formula (3) succimide or the so-called double type (Bis- represented by following formula (4) of the so-called single entry (Mono-type) represented by Type succimide) is modified through borides such as boric acid, borates and obtains.

[changing 1]

In formula (3), R²It indicates the alkyl or alkenyl of carbon atom number 40~400, preferably indicates the alkyl of carbon atom number 60~350 Or alkenyl.R²It is preferably polybutylene-based.M indicates 1~5 integer, preferably indicates 2~4 integer.

[changing 2]

In formula (4), R³And R⁴Can be identical each other also different, they indicate the alkyl or alkenyl of carbon atom number 40~400 respectively, Preferably indicate that carbon atom number is 60~350 alkyl or alkenyl.R³And R⁴It is preferred that respectively polybutylene-based.N indicate 0~4 it is whole Number preferably indicates 1~3 integer.

From the viewpoint of make it is better to the corrosion resistance of lead, the content of (B) ingredient is with lubricant oil composite total amount Benchmark, in terms of boron element conversion, preferably 90 mass ppm or more, more preferably 100 mass ppm or more, further preferably 110 mass ppm or more.From the viewpoint of province's burnup is better, the content of (B) ingredient is using lubricant oil composite total amount as base Standard, in terms of boron element conversion, preferably 180 mass ppm are hereinafter, more preferably 170 mass ppm are hereinafter, further preferably 160 Quality ppm or less.From the viewpoint of taking into account the corrosion resistance to lead at a higher level and saving burnup, the content of (B) ingredient On the basis of lubricating oil total amount, in terms of boron element conversion, preferably 90~180 mass ppm, 90~170 mass ppm, 90~160 Quality ppm, 100~180 mass ppm, 100~170 mass ppm, 100~160 mass ppm, 110~180 mass ppm, 110~ 170 mass ppm or 110~160 mass ppm.(B) ICP elemental microanalysis methods may be used in the content (boron element scaled value) of ingredient It is measured.

From the viewpoint of make it is better to the corrosion resistance of lead, it is logical that lubricant oil composite preferably further contains (C) Calcium perborate carried out the parlkaline metal salts of organic acids (hereinafter also referred to " (C) ingredient ") of alkalization.As metal salts of organic acids, Alkaline earth metal sulfonate, alkaline earth metal salicylate, alkaline earth phenate, alkali earth metal phosphate etc. can be enumerated.Alkaline-earth metal Can be magnesium, calcium, barium, preferably calcium.(C) ingredient for example can by make above-mentioned metal salts of organic acids, calcium hydroxide or calcium oxide, It is obtained by the reaction with boric acid or anhydrous boric acid.

(C) base number of ingredient is preferably 50mg KOH/g or more, more preferably 100mg KOH/g or more, further preferably For 150mg KOH/g or more.(C) base number of ingredient be preferably 500mg KOH/g hereinafter, more preferably 400mg KOH/g hereinafter, Further preferably 300mg KOH/g or less.Base number in the present invention refers to according to JIS K2501:2003 9. perchloric acid method And the base number measured.

From the viewpoint of make it is better to the corrosion resistance of lead, the content of (C) ingredient is with lubricant oil composite total amount Benchmark, in terms of calcium constituent conversion, preferably 100 mass ppm or more, more preferably 110 mass ppm or more, further preferably 120 mass ppm or more.From the viewpoint of make it is better to the corrosion resistance of lead, the content of (C) ingredient is with lubricant oil composite On the basis of total amount, by calcium constituent conversion in terms of, preferably 350 mass ppm hereinafter, more preferably 330 mass ppm hereinafter, further Preferably 300 mass ppm or less.From the viewpoint of make it is better to the corrosion resistance of lead, the content of (C) ingredient is with lubricating oil On the basis of total composition, by calcium constituent conversion in terms of, preferably 100~350 mass ppm, 100~330 mass ppm, 100~ 300 mass ppm, 110~350 mass ppm, 110~330 mass ppm, 110~300 mass ppm, 120~350 mass ppm, 120~330 mass ppm or 120~300 mass ppm.(C) content (calcium constituent scaled value) of ingredient can pass through ICP elements point Analysis method is measured.

Lubricant oil composite can further contain other additives.As other additives, viscosity index (VI) can be enumerated Modifier, antiwear additive, antioxidant, antifoaming agent, pour-point depressant, corrosion inhibitor, antirust agent, anti emulsifier, matal deactivator etc..

As viscosity index improver, poly- (methyl) esters of acrylic acid viscosity index improver, olefin copolymer can be enumerated Class viscosity index improver, styrenic-diene copolymer analog viscosity index improver etc..These viscosity index improvers can be non- Any one of distributed and dispersing type, preferably non-dispersive type.From raising viscosity index (VI) improvement effect, keep viscosity versus temperature special From the perspective of property and low-temperature viscosity profiles are excellent, preferably poly- (methyl) the esters of acrylic acid viscosity of viscosity index improver refers to Number modifier, more preferably poly- (methyl) the esters of acrylic acid viscosity index improver of non-dispersive type.

Pour-point depressant may be, for example, poly- (methyl) acrylate, the poly- (first that preferably weight average molecular weight is 10000~300000 Base) acrylate, poly- (methyl) acrylate that more preferably weight average molecular weight is 50000~200000.

As antiwear additive, can enumerate phosphite ester (phosphite (Phosphite)), phosphate and their amine salt, The sulphur class antiwear additives such as the Phosphorus antiwear additive such as metal salt and derivative, disulphide, polysulfide, olefine sulfide, vulcanization grease.

As antioxidant, the metal systems antioxidant such as the ashless oxidation inhibitors such as phenol, amine and copper class, molybdenum class can be enumerated.Tool For body, for example, can enumerate 4,4 '-di-2-ethylhexylphosphine oxides (2,6- DI-tert-butylphenol compounds), 4 as phenol ashless oxidation inhibitor, 4 '-is bis- (2,6- DI-tert-butylphenol compounds) etc. can enumerate phenyl-α-naphthylamine, alkyl phenyl-alpha-naphthylamine, dioxane as amine ashless oxidation inhibitor Base diphenylamines, diphenylamines etc..

As antifoaming agent, such as the kinetic viscosity that can be enumerated at 25 DEG C is 1000mm²/ s or more 100000mm²/ s is below Silicone oil, alkenyl succinic acid derivative, the ester of polyhydroxy fatty race alcohol and long chain fatty acids, gaultherolin and o- hydroxy-benzyl alcohols Ester etc..

As corrosion inhibitor, such as benzotriazole, azimido-toluene class, glyoxaline compound can be enumerated etc..

As antirust agent, such as alkenyl succinic acid ester, polyol ester, petroleum sulfonate, alkylbenzene sulfonate, two can be enumerated Nonylnaphthalene sulfonates etc..

As anti emulsifier, such as polyoxyethylene alkyl ether, polyoxyethylene alkyl phenyl ether, polyxyethylated can be enumerated Polyalkylene glycols nonionic class surfactant such as naphthyl ether etc..

As matal deactivator, such as imidazoline, pyrimidine derivatives, benzotriazole can be enumerated or derivatives thereof etc..

The content of other additives can be 0.01~20 mass % on the basis of lubricant oil composite total amount.

From the viewpoint of lubricity is excellent, kinetic viscosity of the lubricant oil composite at 40 DEG C is preferably 31.0mm²/ s with On, more preferably 33.0mm²/ s or more, further preferably 35.0mm²/ s or more.From ensuring that necessary low temperature viscosity goes forward side by side one From the perspective of step improves province's burnup, kinetic viscosity of the lubricant oil composite at 40 DEG C is preferably 75.0mm²/ s is hereinafter, more excellent It is selected as 72.0mm²/ s is hereinafter, further preferably 70.0mm²/ s or less.

From the viewpoint of lubricity is excellent, kinetic viscosity of the lubricant oil composite at 100 DEG C is preferably 5.0mm²/ s with On, more preferably 7.0mm²/ s or more, further preferably 8.0mm²/ s or more.From ensuring necessary low temperature viscosity and further It improves from the perspective of saving burnup, kinetic viscosity of the lubricant oil composite at 100 DEG C is preferably 14.0mm²/ s is hereinafter, more excellent It is selected as 13.0mm²/ s is hereinafter, further preferably 12.0mm²/ s or less.

From making, viscosity-temperature profile, heat/oxidation stability and anti-volatile are good and further decrease friction coefficient Viewpoint is set out, and the viscosity index (VI) of lubricant oil composite is preferably 120 or more, more preferably 140 or more, further preferably 150 More than.From the viewpoint of keeping low-temperature viscosity profiles excellent, the viscosity index (VI) of lube base oil is preferably 270 hereinafter, more excellent 260 are selected as hereinafter, further preferably 250 or less.

From the viewpoint of make it is better to the corrosion resistance of lead, the boron content in lubricant oil composite is with lubricating oil On the basis of total composition, preferably 180 mass ppm or more, more preferably 190 mass ppm or more, further preferably 200 Quality ppm or more.From the viewpoint of make to the corrosion resistance of lead and save burnup it is better, the boron member in lubricant oil composite Cellulose content on the basis of lubricant oil composite total amount, preferably 440 mass ppm hereinafter, more preferably 420 mass ppm hereinafter, into One step is preferably 400 mass ppm or less.Boron content may be used ICP elemental microanalysis methods and be measured.

From the viewpoint of make it is better to the corrosion resistance of lead, the calcium element content in lubricant oil composite is with lubricating oil On the basis of total composition, preferably 1800 mass ppm or more, more preferably 1900 mass ppm or more, further preferably 2000 mass ppm or more.From the viewpoint of make it is better to the corrosion resistance of lead, the calcium element content in lubricant oil composite On the basis of lubricant oil composite total amount, preferably 2700 mass ppm hereinafter, more preferably 2600 mass ppm hereinafter, further Preferably 2500 mass ppm or less.Calcium element content can be measured by ICP elemental microanalysis methods.

Lubricant oil composite involved by present embodiment is suitable as lubricant composition for internal combustion engine.As internal combustion Machine can enumerate petrol engine, diesel engine, using the engine containing oxygenatedchemicals fuel, gas engine etc..This Lubricant oil composite involved by embodiment is be especially suitable for diesel engine oil.

[embodiment]

Hereinafter, the present invention is further concretely demonstrated based on embodiment, but the present invention is not limited to embodiments.

Using base oil and additive as shown below, the lubricant oil composite for having and being formed shown in table 1,2 is prepared.

(base oil)

Hydrorefined mineral oils (the kinetic viscosity at 100 DEG C：4.4mm²/ s, viscosity index (VI)：127)

(additive)

A-1：Monoolein

A-2：Oleyl amine

A-3：Oleamide

a-1：Molybdenum dithiocarbamate

B-1：Boric acid modified polybutylene-based succimide (polybutylene-based weight average molecular weight：7420, boron content：0.5 matter Measure %)

C-1：Calcium salicylate (the base number of alkalization was carried out by line borate：190mg KOH/g, calcium element content：6.8 mass %)

D-1：Additive packet (Additive Package) (boron containing calcium salicylate, calcium phenoxide, dialkyl dithiophosphoric acid etc. Constituent content：0.12 mass %, calcium element content：1.5 mass %)

E-1：Styrene-butadiene copolymer

[table 1]

[table 2]

(saving burnup)

For each lubricant oil composite of Examples 1 to 8 and comparative example 1, according to the friction coefficient tested by SRV and HTHS viscosity (ASTM D4683) at 100 DEG C evaluates province's burnup.Show the result in table 3.

About friction coefficient, the situation that friction coefficient is 0.150 or less is set as " A ", friction coefficient is more than 0.150 and is The case where 0.155 or less situation is set as " B ", and friction coefficient is more than 0.155 is set as " C " and is evaluated.

About the HTHS viscosity (ASTM D4683) at 100 DEG C, the situation for being 6.5 or less by the HTHS viscosity at 100 DEG C It is set as " A ", the HTHS viscosity at 100 DEG C is more than 6.5 and is set as " B " for 6.7 or less situation, and the HTHS at 100 DEG C is viscous The case where degree is more than 6.7 are set as " C " and are evaluated.It should be noted that the HTHS at 150 DEG C of all embodiments and comparative example Viscosity is 2.9.

Any one of HTHS viscosity for friction coefficient and at 100 DEG C, if being evaluated as A or B, it is believed that it saves combustion Consumption is excellent.

[table 3]

(to the corrosion resistance of copper)

For each lubricant oil composite of Examples 1 to 8 and comparative example 2, according to corrosion oxidation stability test (JIS K2503: 2010) corrosion resistance of the evaluation to copper.Wherein, be set as sample size 100ml, 135 DEG C of test temperature, test period 168 hours, Air mass flow 5L/h, catalyst are copper, lead, tin.Show the result in table 4.The stripping quantity of copper it is fewer (be, for example, 20 mass ppm with Under), then it is believed that it is more excellent to the corrosion resistance of copper.

[table 4]

(to the corrosion resistance of lead)

For each lubricant oil composite of Examples 1 to 8, according to corrosion oxidation stability test (JIS K2503:2010) it evaluates To the corrosion resistance of lead.Wherein, it is set as sample size 100ml, 135 DEG C of test temperature, test period 168 hours, air mass flow 5L/h, catalyst are copper, lead, tin.Show the result in table 5.The stripping quantity of lead is fewer (being, for example, 150 mass ppm or less), then may be used Think more excellent to the corrosion resistance of lead.

[table 5]

Claims

1. a kind of lubricant composition for internal combustion engines, contains：

Lube base oil,

Ashless friction conditioning agent and

Boron-containing dispersant.

2. lubricant composition for internal combustion engine as described in claim 1 further contains and carried out alkalization by line borate Parlkaline metal salts of organic acids.

3. lubricant composition for internal combustion engine as claimed in claim 1 or 2 is used as diesel engine oil.