CN102690703A - Extreme-pressure long-life industrial lubricant composition - Google Patents
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Abstract
The invention provides an extreme-pressure long-life industrial lubricant composition. The extreme-pressure long-life industrial lubricant composition has excellent oxidation stability, high temperature stability, extreme pressure properties and liquid phase anti-rust properties. The extreme-pressure long-life industrial lubricant composition contains A) a main amount of lubricating base oil, B) a composite antioxidant comprising a naphthylamine antioxidant, an alkylated diphenylamine antioxidant, a thiophenolic ester antioxidant and an unessential phenolic thioether antioxidant, C) one or more metal deactivators, D) one or more extreme-pressure anti-wear agents, and E) one or more ashless anti-rust agents.
Description
Technical field
The present invention relates to a kind of lubricating oil composition, relate in particular to the long-life industrial lubrication oil compsns of a kind of extreme pressure.
Background technology
Industrial lubricant is of wide application; Comprise turbine oil, hydraulicefficiency oil, compressor oil, gear oil, spindle oil, slushing oil, slide rail oil, main shaft oil, chain wet goods; Along with the continuous development of industrial machinery, these industrial lubricants all require to have longer work-ing life and higher load-carrying properties.
With the turbo-engine lube is example, and combustion gas turbine, steam turbine, the waterpower turbine of widespread use at present all requires turbo-engine lube to have advantages of high bearing capacity and long work-ing life.Steam turbine is the high-speed rotary thermal power machinery that a kind of heat energy with steam changes rotating mechanical energy into; Its lubricant housings mainly is wheel box and rotor bearing; Because of its rotor spindle envelope might be scurried vapour; So the possibility of this oiling system water inlet is bigger, the equipment rotating speed is high in addition, load is big, the cycle of operation is long, so all very high to the requirement of rust-preventing characteristic, resistance to emulsion and the oxidation-resistance of oil product; And the combustion gas that combustion gas turbine utilization burning produces is directly done work; Be different from conventional steam turbine and add the acting of thermogenesis steam by burning; The combustion gas turbo-engine lube receives the effect of bearing hot surface and under the velocity control system high pressure, uses, and should have excellent oxidation stability and thermostability, good antirust and demulsification performance; For gear-driven turbine, also should possess good extreme-pressure anti-wear supporting capacity, particularly steam-used turbo-engine lube of the gas Combined recycle system, should satisfy the steam turbine lubricating requirement, also to satisfy the lubricated request for utilization of combustion gas turbine.Therefore, increasingly high to having than the demand of the long lifetime turbo-engine lube of high bearing capacity.
The industrial lubricant of other kind is in harsher bad working environment along with the strictness of the technical progress of associated machines and environmental requirement, is therefore also requiring these industrial lubricants to have longer work-ing life, higher load-carrying properties, rustless property, demulsification performance or the like preferably in varying degrees with its kind difference.
CN200810101208.7 discloses a kind of combination circulation steam turbine lubricating oil composition; Its component and content are by weight percentage: oxidation inhibitor 0.1～2.0%, anti-wear agent 0.01～1.0%, Ashless stain-resistant agent 0.01～1.0%, metal passivator 0.01～1.0%, kilfoam 0.001～1.0%; All the other are base oil; Described oxidation inhibitor is that alkyl diphenylamine is or/and the alkyl thiodiphenylamine; The extreme pressure agent that is adopted is the alkylthio SULPHOSUCCINIC ACID ESTER, alkyl phosphorous acid ester, alkyl phosphate amine salt and alkylthio carbamate.This lubricating oil composition has good high-temperature oxidation susceptibility, extreme pressure property and rustless property, can satisfy the lubrication needs of large-scale combination circulation steam turbine group.
CN99121597.4 discloses a kind of turbo-engine lube with excellent high temperature oxidation stability, selects for use 90-99.75 weight %, sulphur content to be less than 0.03 weight %, the saturates content base oil greater than 90 volume %; Adopt amine substance, alkylated diphenylamine or nonox contain the material of active sulphur as oxidation inhibitor, and like olefine sulfide, sulfide aliphatic acid etc. are as extreme pressure agent.The antioxidant property and the extreme pressure property of oil product have been guaranteed.
US6165951 discloses a kind of combustion gas and steam turbine combined cycle system lubricating composition, and this lubricating composition comprises the hydro carbons lubricating base oil, wherein contains (a) a kind of PA; (b) a kind of thiophosphatephosphorothioate; (c) a kind of alkylating pentanoic; (d) a kind of aspartate type rust-preventive agent.The high temperature oxidation and corrosion test shows that at high temperature this lubricating composition has lower greasy filth generation trend.
CN200810112603.7 discloses a kind of turbo-engine lube with extreme pressure, high antioxygenic property; Its component characteristics is by 1; 3,5 three (3, the 5-di-t-butyl; 4 hydroxybenzyls) s-triazine, two (2; The 4-di-tert-butyl-phenyl) pentaerythritol bis-phosphite, dialkyldithiocarbamacompositions antimony, double focusing iso-butylene imide, 4, four of 4-di-iso-octyldiphenylamine, octyl diphenylamine, DBPC 2,6 ditertiary butyl p cresol, triphenyl thiophosphatephosphorothioate, sulfide isobutene, butyl octyl phosphoric acid amino dodecane salt, dodecenylsuccinic acid, 124 Triazole stearylamine salt, amine gathers trimethylene verivate, polyacrylic ester and base oil and forms.This lubricating oil has excellent anti-oxidative stability and extreme pressure property, is applicable to the special operation condition condition with extreme pressure, has long work-ing life.
Summary of the invention
The present invention provides a kind of extreme pressure long-life industrial lubrication oil compsns, and this lubricating oil composition has excellent oxidation stability, high-temperature stability, extreme pressure property and liquid phase rust-preventing characteristic.
The present invention also provides a kind of above-mentioned industrial lubricant preparation of compositions method and a kind of industrial machinery method in work-ing life that improves.
Extreme pressure long lifetime industrial lubrication oil compsns provided by the invention contains: A>the main lubricant base of measuring; B>composite antioxidant; C>metal passivator; D>extreme pressure anti-wear additives; E>the Ashless stain-resistant agent.The present invention can also contain the additive of other type, like dispersion agent, oiliness improver, skimmer, emulsion splitter etc.
As being used for lubricant base A of the present invention, can be selected from MO, ucon oil or their mixture.Said MO can comprise Witco 70 and hydrorefined, that solvent treatment is crossed alkane, cycloalkanes and mixing alkane-cycloalkanes type mineral lubricating oils from lighting end MO to last running MO on viscosity, be divided into I, II, III class base oil usually.Ucon oil comprises polymerization hydrocarbon ils, korenyl and verivate thereof, for example polybutylenes, Vestolen PP 7052, propylene-isobutylene copolymers, chlorating polybutylenes, gather (1-hexene), gather (1-octene), gather (1-decene) etc.Korenyl and verivate thereof comprise korenyl, alkylating phenyl ether and alkylating diphenyl sulfide and verivate, analogue and homologue.The suitable type of another of ucon oil is an ester class oil, comprises that ester or the complex ester that condensation reaction generates takes place for dicarboxylicacid and various alcohol.The object lesson of these esters includes but not limited to the 2-ethylhexyl diester of Polycizer W 260, sebacic acid two (2-ethylhexyl) ester, the just own ester of FUMARIC ACID TECH GRADE two, dioctyl sebacate, diisooctyl azelate, two different decayl esters of azelaic acid, DOP, didecyl phthalate, sebacic acid two (larane base) ester, linoleic acid dimer etc.The suitable type of another of ucon oil is Fischer-Tropsch method synthetic hydrocarbon oil and lubricant base that this synthetic hydrocarbon oil is obtained through art breading such as hydroisomerizing, hydrogen cracking, dewaxings.
The massfraction of the preferred sulphur content of lubricant base A of the present invention is less than 0.03%, and the stable hydrocarbon massfraction is greater than 90% MO and/or synthetic oil, and generally its 40 ℃ of kinematic viscosity are 5～500mm
2/ s is preferably 10～200mm
2/ s.
Component A accounts for 95%～99.8% of lubricating oil composition total mass, is preferably 97.5%～99.5%.
Being used for B component of the present invention is composite antioxidant, and one of its component is a naphthylamines type oxidation inhibitor; Another component is the mixture of alkylated diphenylamine and sulfophenates type oxidation inhibitor and non-essential thioether phenol type antioxidant, can prepare according to patent CN200910177175.9.
The structural formula of naphthylamines type oxidation inhibitor is in the B component:
R wherein
1, R
2The H that respectively does for oneself perhaps is C
1-C
20Alkyl, preferred H atom or C
1-C
10Alkyl, the optimum seeking site at place is amino contraposition or ortho position.
Naphthylamines type oxidation inhibitor accounts for the 20%-80% of total mass in the composite antioxidant, is preferably 30%-70%, is preferably 40%-60%.The T531 that naphthylamines type oxidation inhibitor can select for use Tianjin chemical company on May Day to produce.
Preferred PA or alkylation N-PA (the for example IRGANOX L-06 of BASF Aktiengesellschaft's production).
The alkylated diphenylamine structural formula is in the B component:
R wherein
3, R
4H or C respectively do for oneself
1-C
12Alkyl, preferred C
4-C
9Alkyl, the position at place are in amino contraposition or ortho position, the preferably tertiary butyl and/or iso-octyl.
Alkylated diphenylamine accounts for the 10%-70% of total mass in the composite antioxidant, is preferably 20%-60%, is preferably 30%-50%.IRGANOX L-01, IRGANOXL-57 that alkylated diphenylamine can select for use BASF Aktiengesellschaft to produce; The T534 that Beijing Xing Pu company produces; The LZ5150A that the blue refining of Lu Borun additive ltd produces; VANLUBE NA, VANLUBE 961, dioctyl diphenylamine VANLUBE81, dinonyldiphenylamine VANLUBE DND that U.S. Vanderbilt company produces, it is right that TUV chemical company produces, to ' di-iso-octyldiphenylamine RC7001.
Preferred alkylated diphenylamine oxidation inhibitor is the tertiary butyl/di-iso-octyldiphenylamine (the for example T534 of Beijing Xing Pu company production).
The structural formula of sulfophenates type oxidation inhibitor is in the B component:
R wherein
5, R
6H or C respectively do for oneself
1-C
12Alkyl, preferred C
1-C
9Alkyl is preferably the methyl and/or the tertiary butyl.Wherein m, n are the integer between the 0-10, are preferably 0,1 or 2.
Sulfophenates type oxidation inhibitor accounts for the 1%-40% of total mass in the composite antioxidant, is preferably 5%-30%, is preferably 8%-20%.Preferred sulfophenates type oxidation inhibitor is 2,2 '-thiobis [3-(3, the 5-di-tert-butyl-hydroxy phenyl) ethyl propionate] (for example the Sichuan oxidation inhibitor 1035 produced of industry chemical industry ltd forever, the IRGANOX L115 that BASF Aktiengesellschaft produces).
The structural formula of thioether phenol type antioxidant is in the B component:
R wherein
7, R
8H or C respectively do for oneself
1-C
12Alkyl, preferred C
1-C
9Alkyl is preferably the methyl and/or the tertiary butyl.Wherein q is the integer between the 0-10, preferred 0,1 or 2.
The thioether phenol type antioxidant accounts for the 0-20% of total mass in the composite antioxidant, is preferably 0.2%-15%, is preferably 2%-10%.Preferred thioether phenol type antioxidant is thiobis-(3,5-di-t-butyl-4-hydroxyl benzyl) (for example the methene 4426-S that produces of Changzhou Ling Chi chemical company, the Lowinox TBP-6 that U.S. big lake company produces, the Irganox 1081 that BASF Aktiengesellschaft produces).
B component accounts for 0.05%～3.0% of lubricating oil composition total mass, is preferably 0.1%～1.5%.
Being used for C component of the present invention is metal passivator, is selected from one or more triazole species, benzotriazole category, thiazoles and thiadiazole and their verivate, and metal passivator commonly used comprises benzothiazole, tolyl-triazole, octyl group triazole, 2-mercaptobenzothiazole, 2; 5-dimercapto-1,3,4-thiadiazoles, 2-sulfydryl-5-hydrocarbon replace-1; 3,4-thiadiazoles, 2-dimercapto-5-dithio-1,3; 4-thiadiazoles, N, N-dibutylamino methylene-benzene triazole, N, N-dihexyl aminomethylene 124 Triazole, N; N-dioctyl aminomethylene 124 Triazole, 2-sulfydryl diazosulfide etc.; Be preferably N, N-dibutylamino methylene-benzene triazole or N, N-dioctyl aminomethylene 124 Triazole.
Component C accounts for 0.01～0.5% of lubricating oil composition total mass, is preferably 0.1～0.3%.
Being used for D component of the present invention is extreme pressure anti-wear additives; Include, without being limited to SULPHOSUCCINIC ACID ESTER, thiophosphatephosphorothioate, alkyl phosphorous acid ester, alkyl phosphate amine salt, thiophosphoric acid amine salt, acid phosphate amine salt, thiophosphoric acid phenyl ester, boronation thiophosphatephosphorothioate amine salt, sulfide isobutene, benzyl disulfide, polyalkylbenzene benzyl sulfide, polysulfide, lead naphthenate, borate, clorafin etc.; Preferred alkyl dithiophosphates and SULPHOSUCCINIC ACID ESTER; The multiple ester amine salt (T307) of described alkyl dithiophosphoric acid salt preferred butyl octyl phosphorodithioic acid amino dodecane salt or butyl octyl phosphorodithioic acid, described SULPHOSUCCINIC ACID ESTER is selected from tricresyl phosphate meta-cresol ester, dibutyl phosphorodithioate or phosphonic acid ester (T451).
Component D accounts for 0.01%～1.0% of lubricating oil composition total mass, is preferably 0.1%～0.5%.
Being used for E component of the present invention is the Ashless stain-resistant agent, and described Ashless stain-resistant agent is selected from one or more in polyol esters of fatty acids, alkenyl succinic acid verivate, phosphate amine salt, acid amides, polyoxyalkylene polyol and the ester thereof.The preferred sorbitan list of many ethanol of the lipid acid ester olein of making rust-preventive agent commonly used, sorbitan trioleate etc.; The preferred thiazolinyl of described alkenyl succinic acid verivate contains alkenyl succinic acid or its ester, tetrahydroglyoxaline alkenyl succinate, alkenyl succinic acid macrogol ester, for example dodecenylsuccinic acid (T746), dodecenylsuccinic acid half ester (T747), the 17 alkenyl imidazoline alkenyl succinate (T703) or the dodecenylsuccinic acid macrogol esters of 8～24 carbon atoms; The phosphate amine salt preferably phosphoric acid monooctyl ester amino dodecane salt of making rust-preventive agent commonly used; The preferred N-oleoyl sarcosine of acid amides of making rust-preventive agent commonly used; The polyoxyalkylene polyol of making rust-preventive agent commonly used and the preferred polyoxyethylene glycol ester of ester thereof, T 46155 oleic acid sorbitol ester.
Component E accounts for 0.01%～0.5% of lubricating oil composition total mass, is preferably 0.1%～0.3%.
The present invention can also add other non-essential additives; Like dispersion agent, oiliness improver, skimmer, emulsion splitter etc.; Described dispersion agent comprises polyisobutene succinimide, boronation polyisobutene succinimide, polyisobutene succinate etc.; Described oiliness improver comprises polyol esters of fatty acids, fatty amine, aliphatic amide etc.; Described skimmer comprises ZGK 5, propenoate ether copolymer etc., and described emulsion splitter comprises condenses, glycol ester and the PEP-101 etc. of amine and oxyethane.
Lubricating oil composition of the present invention can adopt the preparation of following method: each additive (comprise in the composite antioxidant one or more) is joined respectively in the lubricant base or additive is mixed and made into enriched material join that heating mixes in the lubricant base again; Mixing temperature is between 40 ℃-90 ℃, and mixing time is between 1 hour-6 hours.
The method that the present invention improves industrial machinery work-ing life is that lubricating oil composition of the present invention is joined in the oiling system of industrial machinery.
Lubricating oil composition of the present invention has excellent extreme pressure property, rustless property, antioxidant property and oxidation stability; Meet the requirement of long lifetime industrial lubricant; Can be widely used as turbine oil, hydraulicefficiency oil, compressor oil, gear oil, spindle oil, slushing oil, slide rail oil, main shaft oil, chain wet goods industrial lubricant, be specially adapted to anti-oxidant, extreme pressure, antirust and industrial lubricant that particular requirement is arranged work-ing life.
Embodiment
Through embodiment 1-8 and comparative example 1-4 the present invention is described, lubricating oil composition prescription composition is seen table 1 at present.
Components description is following in the table 1:
Component A
A-1:40 ℃ of kinematic viscosity is 32mm
2/ s, viscosity index is 110 lubricant base
A-2:40 ℃ of kinematic viscosity is 46mm
2/ s, viscosity index is 130 lubricant base
B component
B-1：
B-2：
C
8Monosubstituted phenyl-alpha-naphthylamine L-06 40%
C
4/ C
8Alkyl-substituted diphenylamine T534 50%
2,2 '-thiobis [3-(3, the 5-di-tert-butyl-hydroxy phenyl) ethyl propionate] 10%
B-3：
B-4：
Comparative Examples B component *-1 is the alkylated diphenylamine commonly used and the mixture of PA, and mass ratio is 50: 50 between the two.
Comparative Examples B component *-2 is a sulfophenates type oxidation inhibitor, this patent refers to 2,2 '-thiobis [3-(3, the 5-di-tert-butyl-hydroxy phenyl) ethyl propionate]
Component C
C-1:N, N-di-n-butyl aminomethylene 124 Triazole
C-2:N, N-di-n-octyl aminomethylene 124 Triazole
Component D
D-1: tricresyl phosphate meta-cresol ester
D-2: dibutyl phosphorodithioic acid propyl ester
Component E
E-1: dodecenylsuccinic acid half ester
The E-2:N-oleoyl sarcosine
Embodiment 1-8 and comparative example 1-4 have been carried out oxidation induction period test, liquid-phase corrosion test, supporting capacity test, oxidation stability test respectively, and test-results is seen table 1.The oxidation induction period test adopts the rotary oxygen bomb method to compare fast, carries out according to SH/T0193; Liquid-phase corrosion test adopts seawater as source of corrosion, carries out according to GB/T11143; The supporting capacity test adopts gear testing machine to make an experiment, and carries out according to GB/T19936; The oxidation stability test is carried out according to SH/T0124.
Can know by table 1; Embodiment 1 compares with Comparative Examples 1,2 and is illustrated under the situation that adopts composite antioxidant of the present invention; Lubricating oil composition of the present invention has longer inductive phase, stronger supporting capacity, lower total oxidation products amount and throw out amount, shows that lubricating oil composition of the present invention has better antioxidant property, abrasion resistance and oxidation stability; Embodiment 2 compares with Comparative Examples 3,4 and is illustrated under the different basic oil conditions of conversion, and lubricating oil composition of the present invention still has better antioxidant property, abrasion resistance and oxidation stability.Comparative Examples 5 is illustrated in no extreme pressure anti-wear agent with Comparative Examples 6 or does not have rust-preventive agent and exists down, and abrasion resistance or rustless property that existing lubricating oil composition is corresponding are relatively poor, thereby embody the excellent properties of lubricating oil composition of the present invention.
On the whole; Embodiments of the invention have longer inductive phase, stronger supporting capacity, lower total oxidation products amount and throw out amount with respect to Comparative Examples; Show that lubricating oil composition of the present invention has better antioxidant property, abrasion resistance, rustless property and lower deposit-forming tendency, meets the requirement of long lifetime industrial lubricant.
Claims (24)
1. extreme pressure long lifetime industrial lubrication oil compsns comprises following component:
A>the main lubricant base of measuring, account for 95.0%～99.8% of lubricating oil composition total mass;
B>composite antioxidant; Wherein comprise following component at least: naphthylamines type oxidation inhibitor; Alkylated diphenylamine oxidation inhibitor, sulfophenates type oxidation inhibitor and non-essential thioether phenol type antioxidant, said composite antioxidant accounts for 0.05%～3.0% of lubricating oil composition total mass;
C>metal passivator, account for 0.01%～0.5% of lubricating oil composition total mass;
D>extreme pressure anti-wear additives, account for 0.01%～1.0% of lubricating oil composition total mass;
E>the Ashless stain-resistant agent, account for 0.01%～0.5% of lubricating oil composition total mass.
2. according to the described lubricating oil composition of claim 1, it is characterized in that the structural formula of said naphthylamines type oxidation inhibitor is:
R wherein
1, R
2H or C respectively do for oneself
1-C
20Alkyl;
The structural formula of said alkylated diphenylamine oxidation inhibitor is:
R wherein
3, R
4H or C respectively do for oneself
1-C
12Alkyl;
The structural formula of said sulfophenates type oxidation inhibitor is:
R wherein
5, R
6H or C respectively do for oneself
1-C
12Alkyl, m, n are the integer between the 0-10.
The structural formula of said thioether phenol type antioxidant is:
R wherein
7, R
8H or C respectively do for oneself
1-C
12Alkyl, q are the integer between the 0-10.
3. according to the described lubricating oil composition of claim 2, it is characterized in that described R
1, R
2Be H atom or C
1-C
10Alkyl.
4. according to the described lubricating oil composition of claim 2, it is characterized in that described R
3, R
4Be C
4-C
9Alkyl.
5. according to the described lubricating oil composition of claim 2, it is characterized in that described R
5, R
6Be C
4-C
9Alkyl.
6. according to the described lubricating oil composition of claim 2, it is characterized in that described R
7, R
8Be H atom or C
1-C
9Alkyl.
7. according to claim 1 or 2 described lubricating oil compositions, it is characterized in that said naphthylamines type oxidation inhibitor accounts for the 20%-80% of composite antioxidant total mass.
8. according to claim 1 or 2 described lubricating oil compositions, it is characterized in that said alkylated diphenylamine oxidation inhibitor accounts for the 10%-70% of composite antioxidant total mass.
9. according to claim 1 or 2 described lubricating oil compositions, it is characterized in that said sulfophenates type oxidation inhibitor accounts for the 1%-40% of composite antioxidant total mass.
10. according to claim 1 or 2 described lubricating oil compositions, it is characterized in that said thioether phenol type antioxidant accounts for the 0-20% of composite antioxidant total mass.
11., it is characterized in that said naphthylamines type oxidation inhibitor accounts for the 30%-70% of composite antioxidant total mass according to the described lubricating oil composition of claim 7.
12., it is characterized in that said alkylated diphenylamine oxidation inhibitor accounts for the 20%-60% of composite antioxidant total mass according to the described lubricating oil composition of claim 8.
13., it is characterized in that said sulfophenates type oxidation inhibitor accounts for the 5%-30% of composite antioxidant total mass according to the described lubricating oil composition of claim 9.
14., it is characterized in that said thioether phenol type antioxidant accounts for the 0.2-15% of composite antioxidant total mass according to the described lubricating oil composition of claim 10.
15., it is characterized in that said composite antioxidant accounts for the 0.1%-1.5% of lubricating oil composition total mass according to the described lubricating oil composition of claim 1.
16., it is characterized in that said metal passivator is selected from one or more triazole species, benzotriazole category, thiazoles and thiadiazole and their verivate according to the described lubricating oil composition of claim 1.
17., it is characterized in that said metal passivator accounts for the 0.1%-0.3% of lubricating oil composition total mass according to the described lubricating oil composition of claim 1.
18. according to the described lubricating oil composition of claim 1; It is characterized in that said extreme pressure anti-wear additives is selected from one or more of SULPHOSUCCINIC ACID ESTER, thiophosphatephosphorothioate, alkyl phosphorous acid ester, alkyl phosphate amine salt, thiophosphoric acid amine salt, acid phosphate amine salt, thiophosphoric acid phenyl ester, boronation thiophosphatephosphorothioate amine salt, sulfide isobutene, benzyl disulfide, polyalkylbenzene benzyl sulfide, polysulfide, lead naphthenate, borate, clorafin.
19., it is characterized in that said extreme pressure anti-wear additives accounts for the 0.1%-0.5% of lubricating oil composition total mass according to the described lubricating oil composition of claim 1.
20., it is characterized in that said Ashless stain-resistant agent is selected from one or more in polyol esters of fatty acids, alkenyl succinic acid verivate, phosphate amine salt, acid amides, polyoxyalkylene polyol and the ester thereof according to the described lubricating oil composition of claim 1.
21., it is characterized in that said Ashless stain-resistant agent accounts for the 0.1%-0.3% of lubricating oil composition total mass according to the described lubricating oil composition of claim 1.
22., it is characterized in that said lubricant base accounts for 97.5%～99.5% of lubricating oil composition total mass according to the described lubricating oil composition of claim 1.
23. the preparation method of one of a claim 1-22 said lubricating oil composition is characterized in that, each component is mixed between 40 ℃-90 ℃, mixing time is 1 hour-6 hours.
24. one kind is improved the industrial machinery method in work-ing life, it is characterized in that, joins in the oiling system of industrial machinery to one of major general's claim 1-22 said lubricating oil composition.
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