CN105733747B - Ashless hydraulic fluid composition - Google Patents
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Abstract
The invention belongs to lubricating composition technical fields, for a kind of ashless hydraulic fluid composition, its component and content are by mass percentage are as follows: antiwear additive 30~42%, antirust agent 9~14%, antioxidant 37~50%, matal deactivator 4~8%, dispersing agent 1~5%, antiwear additive is two alkylthio phosphates and/or single alkylthio phosphate, antirust agent is that sarcosine derivative and amino acid derivativges or organic amide compound mixture, and antioxidant is alkyl to aniline or/and hindered phenol；Matal deactivator is thiadiazoles derivative or Benzotriazole Derivative, and dispersing agent is polysuccinimide derivative.Advantages of the present invention: ashless hydraulic fluid composition has very excellent wear resistence, low greasy filth and long oxidation life and outstanding filterability and hydrolysis stability, meets GB 11118.1-2011 and Denison HF-0 (2011) specification requirement.
Description
Technical field
The invention belongs to lubricating composition technical fields, are related to a kind of lubricant oil composite, especially a kind of ashless hydraulic
Fluid composition.
Background technique
Hydraulic oil as hydraulic system power transmitting medium is a kind of plural equilibrium system containing multiple additives, extensively
Multi-functional antiwear additive is used as using zinc dialkyl dithiophosphate (ZDDP).But hydraulic oil containing zinc easily causes a huge sum of money to environment
Belong to pollution, and in use by water pollution when, zinc dialkyl dithiophosphate ZDDP be easy hydrolysis generate greasy filth blocking
Filter, and there is certain corrosivity to copper.
Ashless hydraulic fluid can be very good to make up the deficiency of the hydraulic oil containing zinc, avoid heavy metal problem of environmental pollution, reduce
Ash content and greasy filth generate pollution in oil liquid, improve detergency and filterability, meet European Union's ecology regulation and worker health safety law
The requirement of the environmental regulation of rule and some regions such as forest.Therefore, ashless hydraulic fluid is the direction of development, and demand is continuous
Increase, ashless hydraulic fluid technical research is also evolving both at home and abroad.
United States Patent (USP) US 5254272 describes a kind of ashless lubricating oil composition, containing base oil, is synthesized using vulcanization
Ester and thiodiphenvl phosphate amine salt are as antiwear additive.The composition is applied in hydraulic oil, thiodiphenvl phosphate ammonium
The hydrolysis stability of salt is poor, in the case where there is water pollution, is easy to produce greasy filth, and have certain corrosivity to copper.
United States Patent (USP) US 5531911 describes a kind of functional liquid, containing base oil, using triphenyl thiophosphoric acid
Ester and dibutyl dithio phosphate are as antiwear additive, and aryl sulfonic acid ammonium salt is as antirust agent.The functional liquid is applied in liquid
In pressure oil, aryl sulfonic acid ammonium salt water resistance is poor, has and is easy to produce corrosive degradation byproducts, corroding metal parts under the conditions of water
And it generates greasy filth and blocks filter.
2002/0010103 A1 of United States Patent (USP) US describes a kind of with outstanding thermal stability and extreme pressure and antiwear behavior
Lubricant oil composite is used as antiwear additive, laurylene base fourth two using tricresyl phosphate and phosphite ester collocation containing base oil
Acid derivative, laurylene base succinamide derivative or anil are as antirust agent.The composition is applied in hydraulic oil,
The activation temperature of phosphate front three phenolic ester is relatively high, and the anti-wear effect under low pressure and low load is not obvious, and phosphite ester holds
Facile hydrolysis, hydrolysis stability are poor.
United States Patent (USP) US 6531429 describes a kind of lubricant oil composite, containing base oil, using the thio phosphorus of triphenyl
As antiwear additive, phosphate amine salt is added to polyol ester, amine as antirust agent for acid esters and diisopropyl disulfide substituted phosphate
Or epoxide improves filterability.The composition is applied in hydraulic oil, and phosphate amine salt is easy hydrolysis, wet filter
Difference, although the patent improves wet filter, but still presence and divalent by addition polyol ester, amine, epoxide
Metal is easy reaction and forms greasy filth blocking filter.
2004/0259743 A1 of United States Patent (USP) US describes a kind of lubricant oil composite with abrasion resistance, contains base
Plinth oil, using the addition product of alkyl phosphoric acid ester ammonium salt and diisooctyl phosphordithiic acid and acrylamide as antiwear additive,
And it is added to hindered phenol and amine type antioxidant and matal deactivator.This composition can be applied in hydraulic oil, alkyl phosphorus
Acid esters ammonium salt is equally easy hydrolysis, and wet filter is poor.
2005/0096236 A1 of United States Patent (USP) US describes a kind of ashless additive being suitably applied in hydraulic oil and matches
Side uses tributyl phenyl phosphorothioate and acid dialkyl dithiophosphate as antiwear additive, N- containing base oil
Acyl group sarcosine is as antirust agent.The ashless additive formula is applied in hydraulic oil, and II, Group III base oil are not suitable for,
Rustless property in II, Group III base oil is poor, can not be required by ASTM D 665B corrosion test.
Chinese patent CN102399612A discloses a kind of zinc-free high pressure anti-wear hydraulic, and specifically discloses following skill
" include the following components'mass percentage: base oil 98.5%~99%, antioxidant 0.2%~0.4%, extreme pressure are anti-for art feature
Grinding agent 0.7%~0.9%, antirust agent 0.04%~0.07%, matal deactivator 0.04%~0.08%, detergent-dispersant additive
0.015%~0.05%, anti-foaming agent 0.0002%~0.0005% ".
The base oil selected in the patent is I class HVI150 and HVI500, and viscosity index (VI) is less than 110.
I class base oil contains the impurity such as a certain amount of unsaturated hydrocarbons, sulphur, nitrogen, thus to the dissolubility of additive single dose compared with
By force, preferable to the sensitivity of antiwear additive, but the disadvantage is that oxidation stability is poor, service life is shorter.
The basis oil refining of II/III class is deep, completely based on saturated hydrocarbons substance, the hardly miscellaneous original such as sulfur-bearing, nitrogen
Son, advantage are that oxidation stability is good, and service life is significantly better than I class base oil, the disadvantage is that II/III class base oil to antiwear additive,
The dissolubility and sensitivity of the additives such as matal deactivator, antirust agent are poor, therefore choosing of the II/III class base oil to additive
With and law of compound propose higher requirement.
In addition, the antirust agent in the patent is sulfonate or carboxylic acid and carboxylate (based on calcium salt), therefore hydraulic oil exists
Comprehensive performance under the conditions of chance water is bad.
It is maximum to be experimentally confirmed influence of the antirust agent to wet filter (ISO13357) performance, but Ashless stain-resistant simultaneously
Sensitivity of the agent in II/III base oil is poor, and single ashless anti-rusting additive can not meet ASTM 665B antirust corrosion test simultaneously
It is tested with ISO13357 wet filter, needing to carry out a variety of ashless anti-rusting additive composition researchs could be simultaneously by above-mentioned two examination
It tests.
Continuous development with hydraulic technique to high speed, high pressure, high load capacity, hydraulic system more small compact, fuel tank hold
Long-pending and gap is smaller, and filtering accuracy is higher, and this requires hydraulic oil to have better wear resistence, hydrolysis stability, thermostabilization
Property, oxidation stability, filterability and anti-corrosive properties and longer service life.The standard and specification of hydraulic oil are also constantly being repaired
Order and upgrade, as Denison HF-0 (2012) specification hydrolysis stability, oxidation corrosion and filterability are proposed it is higher
It is required that being additionally arranged the blade and plunger mixing double pump (T6H20C) of thermal stability, filterability test and high-voltage pulse load
Dry, wetting phase bench test.Denison HF-0 (2012) specification is the representative antiwear hydraulic oil highest generally acknowledged in the world at present
The horizontal standard of energy, common hydraulic oil are difficult the detection by this standard.
Summary of the invention
The technical scheme is that service life is shorter, right in order to overcome oxidation stability of the existing technology poor
The synthesis that the dissolubility and sensitivity of the additives such as antiwear additive, matal deactivator, antirust agent are poor, hydraulic oil is under the conditions of meeting water
The bad shortcoming of performance, and provide it is a kind of with excellent hydrolysis stability, filterability, wear resistence and oxidation stability with
And the ashless hydraulic fluid composition of low greasy filth, it is able to satisfy GB 11118.1-2011 and Denison HF-0 (2012) specification mark
It is quasi-.Antirust agent is that sarcosine derivative and amino acid derivativges or organic amide compound mixture, therefore use is ashless hydraulic
The hydraulic oil of fluid composition blending has better comprehensive performance under the conditions of meeting water.
Technical solution of the present invention:
A kind of ashless hydraulic fluid composition, the component and content of the composition are by mass percentage are as follows:
Described antiwear additive is two alkylthio phosphates and/or single alkylthio phosphate, between the two in mass ratio
It compounds and mixes for 1:2~15.
Described antirust agent is the mixture that compounds of sarcosine derivative and amino acid derivativges or organic amide, the two it
Between in mass ratio for 1:1~3 compounding mixing.
Described antioxidant is alkyl to aniline or/and hindered phenol, and ratio is 0~1:2.
Described matal deactivator is thiadiazoles derivative or Benzotriazole Derivative.
Described dispersing agent is polysuccinimide derivative.
The structural formula of described two alkylthio phosphate of antiwear additive are as follows:
Wherein R1Or R2It is arene compound, any heterocycle or alkyl, and X is 2~5, Y 2X；R3For H, alkyl or alkane
Base amine；
The structural formula of described single alkylthio phosphate are as follows:
Wherein R4、R5Or R6It can be arene compound, any heterocycle, alkyl or alkylamine.
The structural formula of described antirust agent sarcosine derivative are as follows:
Wherein R7For alkyl, X 1-5, Y 2X；
The structural formula of described amino acid derivativges are as follows:
Wherein R8、R9、R10And R11For alkyl；
The structural formula of described organic amide are as follows:
Wherein R12For alkyl.
Structural formula of the described antioxidant alkyl to aniline are as follows:
Wherein: R13And R14For alkyl；
The structural formula of described hindered phenol are as follows:
Wherein: R15And R16For alkyl, R17For alkyl or alkyl ester group.
The structural formula of Benzotriazole Derivative in described matal deactivator are as follows:
Wherein: R18、R19And R20For alkyl.
Beneficial effects of the present invention:
Ashless hydraulic fluid composition provided by the invention, by reasonable compatibility and the antiwear additive without ash component, antirust agent,
The selection of antioxidant, matal deactivator and dispersing agent can meet the GB 11118.1- of peak performance level standard
2011 and Denison HF-0 (2012) specification requirement, has a characteristic that
1, wear resistence is very excellent, has passed through 35VQ25 bench test and Denison T6H20C bench test.Comparison is originally
The product specification of Patent right requirement and documents 1, maximum difference are the variation of hydraulic pump rack.
1 35VQ25 bench test of table and Denison T6H20C bench test condition
2 GB 11118.1-94 and Denison HF-0 of table
By Tables 1 and 2 as can be seen that the T6H20C pump platform experiment for needing to meet in claims introduces water,
Quite high requirement is proposed to the wear resistence of hydraulic oil, water resistance, anticorrosive metal performance, wherein abrasion total weight loss is less than
315mg, therefore the specification that the ashless hydraulic fluid composition in patent claims book is met is higher than documents 1.And
And the promotion of product specification has researched and proposed higher requirement to additive single dose performance and law of compound.
2, low greasy filth generates greasy filth in CINCINNATI hydraulic oil heat stabilization test and is less than 25mg；ASTM D943 oxidation
It tests and generates within 1000 hours the 100mg that greasy filth amount is less than in Denison HF-0 (2012) specification.
3, it with outstanding filterability, is detected by the wet examination filterability method of ISO 13357, Denison HF-0 (2012)
Specification requirement requires wet type FII to be not less than 50, and the antiwear additive and antirust agent and water of ashless hydraulic fluid composition selection be not bright
Aobvious reaction, FII are not less than 50.
4, with outstanding hydrolysis stability, meet Denison HF-0 (2012) specification requirement, ASTM D2619 water
The water layer acidity for solving soundness test is less than 4mgKOH, and copper weightlessness is less than 0.2mg/cm2.
5, suitable antirust agent compound system is used, adaptability is preferable in I, II, III and IV class base oil, can
By ASTM D668B rust prevention test, T6H20C double pump bench test, meet GB11118.1 (2011) and Denison HF-0
(2012) standard requirements.
Specific embodiment
Ashless hydraulic fluid composition of the present invention, component and content (mass percent) are as follows: antiwear additive 30%~
42%, antirust agent 9%~14%, antioxidant 37%~50%, matal deactivator 4%~8%, dispersing agent 1%~5%, wherein
Antiwear additive is two alkylthio phosphates and/or single alkylthio phosphate, is mixed in mass ratio for the compounding of 1:2~15 between the two
It closes；
Antirust agent is that sarcosine derivative and amino acid derivativges or organic amide compound mixture, between the two by matter
Amount is than being the compounding mixing of 1:1~3；
Antioxidant is alkyl to aniline or/and hindered phenol, is in mass ratio between the two 0~1:2 compounding mixing；
Matal deactivator is Benzotriazole Derivative；
Dispersing agent is polysuccinimide derivative.
The antiwear additive, secondly the structural formula of alkylthio phosphate are as follows:
Wherein R1Or R2It is arene compound, any heterocycle, alkyl, and X is 2-5, Y 2X；R3 is H, alkyl or alkyl
Amine
The structural formula of single alkylthio phosphate are as follows:
Wherein R4、R5Or R6It can be arene compound, any heterocycle, alkyl or alkylamine.
The antirust agent, the structural formula of sarcosine derivative are as follows:
Wherein R7For alkyl, X 1-5, Y 2X；
The structural formula of amino acid derivativges are as follows:
Wherein R8、R9、R10And R11For alkyl；
The structural formula of organic amide are as follows:
Wherein R12For alkyl.
The antioxidant, structural formula of the alkyl to aniline are as follows:
Wherein, R13And R14For alkyl；
The structural formula of hindered phenol is
Wherein R15And R16For alkyl, R17For alkyl or alkyl ester group.
Benzotriazole Derivative structural formula in the matal deactivator are as follows:
Wherein, R18、R19And R20For alkyl.
The hydraulic oil for preparing full formula, using one of I, II, III and IV class base oil or a variety of, adjustment viscosity is full
Sufficient ISO viscosity class requirement, addition silicon type anti-foaming agent and demulsification agent dose are 0.01% (mass percent in full formula), this
Additive capacity of the invention ashless hydraulic fluid composition in hydraulic oil is 0.6%~0.8% (mass percent in full formula).
Embodiment 1
The antiwear additive of ashless hydraulic fluid composition is tri-tert phenyl thiophosphate and 3- (O, O- diisopropyl disulfide
For phosphoryl)-propionic acid compounding, mass percent is respectively 28.6% and 7.1%, and antirust agent is positive oleyl sarcosine and amino
Acid derivative A compounding, mass percent is not 4.3% and 7.1%, and antioxidant is 2,6-di-tert-butyl p-methylphenol, quality
Percentage is 42.9%, matal deactivator N, N- di-n-butyl aminomethylene methyl benzotriazole, and mass percent is
7.1%, polysuccinimide derivative disperser is succimide T154A, mass percent 2.9%.Wherein amino acid
Derivative A structural formula are as follows:
Embodiment 2
The antiwear additive of ashless hydraulic fluid composition is tri-tert phenyl thiophosphate and 3- (O, O- diisopropyl disulfide
For phosphoryl) -2- methvl-propionic acid methyl este, mass percent be 27.4% and 13.7%, antirust agent be positive oleyl sarcosine and
Amino acid derivativges A compounding, mass percent is not 2.7% and 6.8%, and antioxidant is 2,6-di-tert-butyl p-methylphenol,
Mass percent is 41.1%, matal deactivator N, N- di-n-butyl aminomethylene methyl benzotriazole, and mass percent is
4.2%, polysuccinimide derivative disperser succimide T154A, mass percent 4.1%.
Embodiment 3
The antiwear additive of ashless hydraulic fluid composition is tri-tert phenyl thiophosphate and 3- (O, O- diisopropyl disulfide
For phosphoryl) -2- rnethyl-propanoic acid, mass percent is 37.5% and 2.5%, and antirust agent is positive oleyl sarcosine and amino
Acid derivative A compounding, mass percent are not 6.3% and 6.3%, and antioxidant is 2,6-di-tert-butyl p-methylphenol and butyl
Diphenylamines compounding, mass percent is respectively 25% and 12.5%, matal deactivator N, N- di-n-butyl aminomethylene first
Base benzotriazole, mass percent 6.3%, polysuccinimide derivative disperser succimide T154A, mass percent
It is 3.6%.
Embodiment 4
The antiwear additive of ashless hydraulic fluid composition is tri-tert phenyl thiophosphate and 3- (O, O- diisopropyl disulfide
For phosphoryl)-acrylic acid, mass percent is 25% and 5%, and antirust agent is positive oleyl sarcosine and dodecenylsuccinic acid
Amide compounding, mass percent are not 5% and 8.3%, and antioxidant is 2,6-di-tert-butyl p-methylphenol, mass percent point
Not Wei 50%, matal deactivator N, N- di-n-butyl aminomethylene methyl benzotriazole, mass percent 5%, polybutadiene
Imide derivative dispersing agent succimide T154A, mass percent 1.7%.
Embodiment 5
The antiwear additive of ashless hydraulic fluid composition is trimethylphenyl thiophosphate and 3- (O, O- diisopropyl disulfide generation
Phosphoryl)-acrylic acid compounding, mass percent is respectively 25% and 5%, and antirust agent is positive oleyl sarcosine and amino acid spreads out
Biological A compounding, mass percent are 3.3% and 8.3%, and antioxidant is 2,6-di-tert-butyl p-methylphenol, mass percent
It is 50%, matal deactivator N, N- di-n-butyl aminomethylene methyl benzotriazole, mass percent 5%, polybutadiene acyl
Imine derivative dispersing agent is succimide T154A, mass percent 3.4%.
Embodiment 6
The antiwear additive of ashless hydraulic fluid composition is 3- (O, O- diisopropyldithiophosphoryl) -2- rnethyl-propanoic acid first
Ester and 3- (O, O- diisopropyldithiophosphoryl)-acrylic acid, mass percent are 29.9% and 4.5%, and antirust agent is positive
Oleyl sarcosine and amino acid derivativges A compounding, mass percent is not 4.5% and 7.5%, antioxidant 2, the tertiary fourth of 6- bis-
Base p-methyl phenol, mass percent 44.6%, matal deactivator N, N- di-n-butyl aminomethylene methyl benzotriazole,
Mass percent is 4.5%, polysuccinimide derivative disperser succimide T154A, mass percent 4.5%.
Embodiment 7
The antiwear additive of ashless hydraulic fluid composition is that (O, O- diisooctyl two is thio by trimethylphenyl thiophosphate and 3-
Phosphoryl) -2- rnethyl-propanoic acid, mass percent is 27% and 13.5%, and antirust agent is positive oleyl sarcosine and laurylene base
Succinamide compounding, mass percent are not 4.1% and 6.8%, and antioxidant is 2,6-di-tert-butyl p-methylphenol and fourth
Base diphenylamines compounding, mass percent is respectively 27% and 13.5%, matal deactivator N, N- di-n-butyl aminomethylene
Methyl benzotriazole, mass percent 4.1%, polysuccinimide derivative disperser succimide T154A, quality percentage
Than being 4%.
Use II class base oil adjustment viscosity grade for ISO VG 46, addition silicon type anti-foaming agent and demulsification agent dose are
0.01%, ashless hydraulic fluid composition dosage is 0.7%, carries out following performance test to full formula hydraulic oil HMN46 is mixed into
(the results are shown in Table 2).
1. wear resistence: 35VQ25 bench test and Denison T6H20C bench test (condition and standard are shown in Table 1).
2. thermo oxidative stability: CINCINNATI hydraulic oil heat stabilization test, Denison HF-0 (2011) specification requirement
No more than 100mg；ASTM D943 oxidation test, 1000 hours generation greasy filth amounts of Denison HF-0 (2011) specification requirement are not
Greater than 100mg
3. filterability: the wet examination filterability of ISO 13357 is the most harsh method of current evaluation oil product wet filter performance,
DIN 51524-2006 requires wet type FII to be not less than 50.
4. hydrolysis stability: the test of ASTM D2619 hydrolysis stability, water layer acidity requirements are less than 4mgKOH, and copper weightlessness is wanted
It asks and is less than 0.2mg/cm2.
3 full formula ashless anti-wear hydraulic oil HMN46 the performance test results of table
Can be seen that the hydraulic oil that ashless hydraulic fluid composition provided by the invention is concocted from the result of above-mentioned table 3 has
Excellent wear resistence, low greasy filth and long oxidation life, outstanding filterability and hydrolysis stability, meet GB 11118.1-2011
With Denison HF-0 (2011) specification requirement.
Determine that antirust agent is answering for threonine derivative and amino acid derivativges or organic amide by many experiments this patent
It is in mass ratio between the two the compounding mixing of 1:1~3, and ashless hydraulic fluid composition can meet simultaneously with mixture
ASTM665B and ISO13357 two experiments.
Although sarcosine and amino acid derivativges, organic amide is the common antirust agent in lubricating oil field, various nothings
The compounding effect of grey antirust agent and the compounding effect between antiwear additive, matal deactivator are that the present invention is different from the prior art
Place.
Ashless hydraulic fluid composition of the invention is multiple by the screening to antirust agent, and to antirust agent and other additives
Research with performance makes ashless hydraulic fluid composition have superior performance than non-zinc anti-wear hydraulic oils, can satisfy higher
Product specification.
Claims (7)
1. a kind of ashless hydraulic fluid composition, it is characterised in that: the component and content of the composition are by mass percentage are as follows:
Described antiwear additive is two alkylthio phosphates and/or single alkylthio phosphate, the described thio alkane of antiwear additive two
The structural formula of base phosphate are as follows:
Wherein R1Or R2It is aryl, any heterocycle or alkyl, and X is 2~5, Y 2X；R3For H or alkyl；
The structural formula of described single alkylthio phosphate are as follows:
Wherein R4、R5Or R6It can be aryl, any heterocycle or alkyl；
Described antirust agent is that sarcosine derivative and amino acid derivativges or organic amide compound mixture, is pressed between the two
Mass ratio is the compounding mixing of 1:1~3；
Wherein, the structural formula of sarcosine derivative are as follows:
Wherein R7For alkyl, X 1-5, Y 2X；
The structural formula of described amino acid derivativges are as follows:
Wherein R8、R9、R10And R11For alkyl；
The structural formula of described organic amide are as follows:
Wherein R12For alkyl.
2. a kind of ashless hydraulic fluid composition according to claim 1, it is characterised in that: described antiwear additive is two thio
Alkyl phosphate and/or single alkylthio phosphate are in mass ratio between the two the compounding mixing of 1:2~15.
3. a kind of ashless hydraulic fluid composition according to claim 1, it is characterised in that: described antioxidant is alkyl pair
Aniline or/and hindered phenol, ratio are 0~1:2.
4. a kind of ashless hydraulic fluid composition according to claim 1, it is characterised in that: described matal deactivator is thiophene
Oxadiazole derivative or Benzotriazole Derivative.
5. a kind of ashless hydraulic fluid composition according to claim 1, it is characterised in that: described dispersing agent is polybutadiene
Imide derivative.
6. a kind of ashless hydraulic fluid composition according to claim 3, it is characterised in that: described antioxidant alkyl is to benzene
The structural formula of amine are as follows:
Wherein: R13And R14For alkyl；
The structural formula of described hindered phenol are as follows:
Wherein: R15And R16For alkyl, R17For alkyl or alkyl ester group.
7. a kind of ashless hydraulic fluid composition according to claim 4, it is characterised in that: in described matal deactivator
The structural formula of Benzotriazole Derivative are as follows:
Wherein: R18、R19And R20For alkyl.
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| CN109679717B (en) * | 2017-10-18 | 2022-06-24 | 中国石油化工股份有限公司 | Compressor lubricating oil composition and preparation method thereof |
| CN111040823B (en) * | 2020-01-02 | 2022-06-28 | 济南佳进新材料有限公司 | Anti-wear agent, application thereof, preparation method thereof, ashless hydraulic oil composition and preparation method thereof |
| CN113493715B (en) * | 2020-04-07 | 2022-06-03 | 中国石油天然气股份有限公司 | Hydraulic oil additive composition |
| CN111575092A (en) * | 2020-05-27 | 2020-08-25 | 中国石油化工股份有限公司 | Turbine oil composition, preparation method and application thereof |
| CN114657012B (en) * | 2022-04-20 | 2023-01-03 | 卡松科技股份有限公司 | High-cleanness high-pressure ashless anti-wear hydraulic oil composition and preparation method thereof |
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| JP4598907B2 (en) * | 1999-04-16 | 2010-12-15 | Ｊｘ日鉱日石エネルギー株式会社 | Hydraulic fluid composition |
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| CN102399612B (en) * | 2011-10-08 | 2013-12-18 | 中国石油化工股份有限公司 | Zinc-free high pressure anti-wear hydraulic oil and preparation method thereof |
| CN103509637A (en) * | 2012-06-21 | 2014-01-15 | 中国石油天然气股份有限公司 | Automobile automatic transmission liquid composition with excellent anti-wear property |
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