CN102757842B - Ashless low-temperature hydraulic oil - Google Patents
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Abstract
The invention discloses ashless low-temperature hydraulic oil composed of tempered base oil and composite additives. The tempered base oil comprises 10-80wt% of low-viscosity hydrogenation base oil, 10-80wt% of mineral base oil, 0-40wt% of IV and/or V type base oil, 0.1-10wt% of viscosity index improver and 0-5wt% of pour point depressant. The mineral base oil is selected from II type base oil, III type base oil, bright oil or any optional two of the three types of oil. The viscosity of the low-viscosity hydrogenation base oil at 100 DEG C is 1.5-3.0mm<2>/s, alkane content of the low-viscosity hydrogenation base oil is smaller than 40wt%, total cycloalkane content is larger than 60wt%, aromatic hydrocarbon content is smaller than 0.2wt%, and sulfur content is smaller than 0.05wt%. The composite additives include 0.1-40wt% of extreme-pressure antiwear agent, 0.1-50wt% of antioxidant, 0.1-10wt% of antiseptics, 0.1-40wt% of antifriction agent and 1.0-60wt% of diluents oil. The mass ratio of the composite additives to the tempered base oil is 0.1-10.0%. Each performance of the ashless low-temperature hydraulic oil completely meets the technical requirements on HV series hydraulic oil in the GB/T11118.1-94 and ISO11158-2009 standards.
Description
Technical field
The present invention is a kind of antiwear hydraulic oil, specifically, is a kind of low temperature ashless anti-wear hydraulic oil by the modulation of composite foundation oil.
Background technology
Hydrogenated base oil has that sulphur, nitrogen, aromaticity content are low, and the advantage that low-temperature performance is good, significantly improves the susceptibility of oxidation inhibitor, and toxicity reduces, and thermostability and oxidation stability are good.Along with lubricating oil is to high-quality future development, the I class oil that lubricant base is just being stipulated by API criteria for classification changes to II/III class oil.
In hydrogenated base oil, 100 ℃ of kinematic viscosity are at 1.5～3.0mm
2the viscosity index of the low viscosity base oil between/s is little, and viscosity is little, and flash-point is low, and volatility is large, and therefore its application is extremely restricted.Be typically used as thinning oil or concocted or be cracked into lighter product, as diesel oil and petroleum naphtha etc.; Even if as lubricating oil, be only also to use transformer oil, metal working fluid etc. in flash-point, the less demanding oil product of volatile performance, greatly reduce its marketable value.Yet in hydrogenated oil production process, this ultra-low viscosity hydrogenated oil accounts for the more than 40% of all prods, if its utility value is not high, very large financial loss will be caused.
CN1726272A discloses a kind of by the method for low viscosity fischer-tropsch synthetic base oil and traditional base oil blending production high quality lubricating base oil, and using 100 ℃ of kinematic viscosity is about 2mm
2/ s or larger but be less than 3mm
2the synthetic distillate cut of the fischer-tropsch of/s, with the oil base oil of the mixture of I class base oil, II class base oil, III class base oil and above-mentioned two or more traditional base oil by applicable ratio blending, so that 100 ℃ of viscosity of production are about 3mm
2/ s or larger lubricating base oil tempered oil.Described low viscosity fischer-tropsch synthetic base oil has high viscosity index and lower volatility.
CN1829788A discloses a kind of by the accord method of low viscosity fischer-tropsch base oil and Fisher-Tropsch derived tower bottom distillate bright stock, by concocting 100 ℃ of viscosity, is 2mm
2/ s or larger but be less than 3mm
2fischer-tropsch overhead product cut and the Fisher-Tropsch derived tower bottom distillate of/s are prepared Fisher-Tropsch derived lubricating base oil; Lubrication base oil compositions has 100 ℃ of approximately 3～10mm
2the viscosity of/s and lower than the TGA Noack volatility of about 45wt%; The refining lubricant that uses this lubricating base oil to prepare, is applicable to doing base chamber lubricant.
US6703353B1 discloses a kind ofly take 100 ℃ of kinematic viscosity as about 2mm
2/ s or larger but be less than 3mm
2the synthetic distillate of low viscosity fischer-tropsch and another 100 ℃ of viscosity of/s are greater than 3.8mm
2the Fisher-Tropsch synthesis fuels of/s forms base oil, then this base oil and traditional I class base oil, the blending of II class base oil can be produced to high-quality lubricating base oil, and 100 ℃ of viscosity of lubricating base oil tempered oil are about 3～10mm
2/ s, Noack weight vaporization losses is lower than approximately 35%.
It is about 1.5～3.6mm by 100 ℃ of viscosity that WO2008/079740 discloses a kind of
2that/s, Noack evaporation mass loss 0～100% and the light base oil of low viscosity that is less than Noack volatility coefficient and traditional I class base oil, the blending of II class base oil are produced is high-quality, Noack weight vaporization losses is lower than the method for approximately 29% lubricating base oil, and 100 ℃ of viscosity of this method production are about 3～10mm
2/ s lubricating base oil tempered oil.The light base oil of described low viscosity is the synthetic distillate of fischer-tropsch, and viscosity index is greater than 120.
Summary of the invention
The object of this invention is to provide a kind of ashless low temperature hydraulic oil, this hydraulic efficiency oil base oil used is made by the blending of low viscosity hydrogenated base oil, and the ashless low temperature hydraulic oil making after adding suitable additives meets the service requirements of standard regulation.
Ashless low temperature hydraulic oil provided by the invention, comprise blending base oil and composite additive, described blending base oil comprises the low viscosity hydrogenated base oil of 10～80 quality %, the IV of the mineral base oil of 10～80 quality %, 0～40 quality % and/or V class base oil, the viscosity index improver of 0.1～10 quality %, the pour point depressant of 0～5 quality %, 100 ℃ of viscosity of described low viscosity hydrogenated base oil are 1.5～3.0mm
2/ s, in its composition, paraffinicity is less than 40 quality %, total naphthene content is greater than 60 quality %, aromaticity content is less than 0.2 quality %, sulphur content is less than 0.05 quality %, described mineral base oil is selected from II class base oil, III class base oil, in bright stock or described three class oil any two kinds, described composite additive comprises the extreme pressure anti-wear additives of 0.1～40 quality %, the oxidation inhibitor of 0.1～50 quality %, the sanitas of 0.1～10 quality %, the thinning oil of the low friction compound of 0.1～40 quality % and 1.0～60 quality %, the mass ratio of described composite additive and blending base oil is 0.1～10.0%.
The present invention is applicable to low viscosity hydrogenated base oil, full-bodied mineral base oil and the appropriate composite preparation of viscosity index improver the blending base oil of low temperature hydraulic oil, effectively utilized the low viscosity hydrogenated base oil of low value, in blending base oil of the present invention, add suitable additive and can obtain high performance ashless low temperature antiwear hydraulic oil, its properties meets the technical requirements of HV series low temperature hydraulic oil in GB/T11118.1-94 and ISO11158-2009 completely.
Embodiment
The present invention, by low viscosity hydrogenated base oil and full-bodied mineral base oil and viscosity index improver blending, obtains being applicable to the blending base oil of low temperature hydraulic oil, adds wherein composite additive, obtains ashless low temperature hydraulic oil.This is ashless, and low temperature hydraulic oil makes full use of the advantage of low viscosity hydrogenated base oil, overcome the deficiency that its viscosity is little, flash-point is low, vaporization losses is large, viscosity index is not high, properties meets the technical requirements of HV series viscosity grade 15,22,32,46,68 hydraulic efficiency oil in GB/T11118.1-94 and ISO11158-2009 standard completely, reduced the cost of base oil, thereby also reduced the cost of low temperature hydraulic oil, solved low viscosity hydrogenated base oil and be difficult to obtain the problem that high value is utilized.
Ashless low temperature hydraulic oil provided by the invention comprises blending base oil and composite additive, and described blending base oil comprises low viscosity hydrogenated base oil, full-bodied mineral base oil and viscosity index improver.For improving the low-temperature performance of blending base oil, preferably in blending base oil, add IV and/or V class base oil, in blending base oil, add after IV class and/or V class base oil, can, not with pour point depressant, also can add a small amount of pour point depressant.This kind of blending base oil preferably includes the low viscosity hydrogenated base oil of 20～60 quality %, the IV of the mineral base oil of 15～50 quality %, 5～25 quality % and/or V class base oil, the viscosity index improver of 1～8 quality %, the pour point depressant of 0～1.0 quality %.
For improving the low-temperature performance of blending base oil, also can in blending base oil, add pour point depressant, if add pour point depressant in blending base oil, can not add IV class and/or V class base oil.This kind of blending base oil preferably includes the low viscosity hydrogenated base oil of 20～60 quality %, the IV of the mineral base oil of 15～50 quality %, 0～25 quality % and/or V class base oil, the viscosity index improver of 1～8 quality %, the pour point depressant of 0.1～3.0 quality %.
Above-mentioned blending base oil medium viscosity index improving agent content can be 1.0～6.0 quality %, and pour point depressant content can be 0.1～1.0 quality %.
Low temperature hydraulic oil of the present invention composite additive used preferably include the extreme pressure anti-wear additives of 1.0～20 quality %, the sanitas of the oxidation inhibitor of 1.0～25 quality %, 0.5～5 quality %, the thinning oil of the low friction compound of 1.0～30 quality % and 30～55 quality %.
The mass ratio of described composite additive and blending base oil is 0.1～10.0%, preferably 0.8～3.0%.
100 ℃ of viscosity of described low viscosity hydrogenated base oil are 1.5～3.0mm
2/ s, viscosity index is 75～90, and pour point is not higher than-42 ℃, preferably-55～-42 ℃, and open flash point is not less than 150 ℃, preferably 150～180 ℃, and (250 ℃, 1h) be not less than 75%, preferably 75～90% in Noack evaporation mass loss.The aromaticity content of described low viscosity hydrogenated base oil is very little, hardly sulfur-bearing.
Described mineral base oil is selected from by II class base oil, III class base oil or the bright stock of the technical requirements classification of API-1509 regulation, or the composition of any two kinds in above-mentioned three class oil.Described bright stock is made by residual oil, has higher viscosity.
Above-mentioned II class base oil refers to that saturated hydrocarbon content is greater than the base oil that 90 quality %, viscosity index are 80～120, sulphur content is less than 0.3 quality %, preferably No. 4, No. 6, No. 8, No. 10 hydrogenated base oils, 100N, 150N, 250N, 350N, 400N, 500N, 650N hydrogenated base oil.
III class base oil refers to that saturated hydrocarbon content is greater than the base oil that 90 quality %, viscosity index are greater than 120, sulphur content is less than 0.3 quality %, preferably Yu-4, Yu-6, Yu-8 hydrogenated base oil.
IV class base oil refers to poly-alpha olefins (PAO) synthetic base oil, and its kind has PAO4, PAO6, PAO8, PAO10, PAO12.
V class base oil refers to the lubricant base except I class, II class, III class, IV class base oil, as synthesizing ester base oil, alkylnaphthalene class base oil, silicone oil etc., described synthesizing ester base oil can be one or more in trihydroxymethylpropanyl ester, adjacent benzenetricarboxylic acid ester, neopentyl polyol ester or pentaerythritol ester.
The kind of described bright stock has 120BS, 150BS, hydrogenation 120BS or hydrogenation 150BS.
100 ℃ of viscosity that the present invention prepares blending base oil II class～V class base oil used are preferably greater than 3.6mm
2/ s, more preferably 3.8～15.0mm
2/ s.
Extreme pressure anti-wear additives in described composite additive is selected from sulfur-bearing extreme pressure anti-wear additives, phosphorous extreme pressure anti-wear additives, sulfur-bearing phosphorus extreme pressure anti-wear additives or sulfur-bearing phosphorus nitrogen extreme pressure anti-wear additives, preferably one or more in triphenyl-thiophosphate, thiophosphatephosphorothioate, thiophosphoric acid amine salt, olefine sulfide, sulfo-amino ester.
Described oxidation inhibitor is selected from amine type oxidation inhibitor, phenol type antioxidant, ester type oxidation inhibitor, preferably one or more in 2,6 ditertiary butyl p cresol, hindered phenol, alkyl diphenylamine, alkyl phenyl propionic ester.
Described sanitas is selected from one or more in carboxylic acid derivative, carboxylates derivatives, 124 Triazole derivative, thiadiazoles derivative.
Described low friction compound is selected from one or more in phosphoric acid ester, phosphonic acid ester, 124 Triazole derivative.
The present invention's pour point depressant used is selected from one or more in polyolefine pour point depressant, polymethacrylate pour point depressant or alkylnaphthalene.The preferred T803 of poly-alpha-olefin pour depressant, the preferred T814 of polymethacrylate pour point depressant, Empicryl PPT 148, the preferred T801 of alkylnaphthalene pour point depressant.
Described viscosity index improver is selected from ethylene-propylene copolymer, polyisobutene or polymethacrylate.The preferred T613 of ethylene-propylene copolymer viscosity index improver, T614, T618, L7, P8230, the preferred L3 of polyisobutene viscosity index improver, the preferred T602 of polymethacrylate viscosity index improver, T632, T633, T634, Viscoplex series product.
It is 4.0～10.0mm that described thinning oil is selected from 100 ℃ of viscosity
2the base oil of/s, preferably I class, II class or the III class base oil described in API-1509.Described I class base oil refers to that saturated hydrocarbon content is less than 90 quality %, and viscosity index is 80～120, and sulphur content is greater than the base oil of 0.3 quality %.The preferred 100SN of I class base oil, 150SN, 250SN as thinning oil of the present invention.
The modulator approach of the present invention is ashless low temperature antiwear hydraulic oil is: in blending base oil, add the composite additive preparing, dispersed with stirring is even, obtains low temperature antiwear hydraulic oil.
The preparation method of mediation base oil of the present invention is: first by allocating than lubricant base is added to the blending kettle with whipping appts, then by allocating than adding low viscosity hydrogenated base oil, 15～45 ℃ are stirred 30～60 minutes, add again pour point depressant and/or viscosity index improver, 50～70 ℃ are stirred 30～60 minutes, filter and obtain blending base oil composition.
Described composite additive is containing required various additives and the thinning oil of antiwear hydraulic oil, its preparation method is that various additives are added in thinning oil and make uniform liquid in required ratio, to add the low temperature antiwear hydraulic oil of making each viscosity grade in blending base oil.
Below by example, further describe the present invention, but the present invention is not limited to this.
Example 1
Preparation the present invention composite additive used.
Extreme pressure anti-wear additives, oxidation inhibitor, sanitas, low friction compound and thinning oil are modulated into two kinds of composite additive B by the additive types shown in table 1 and additional proportion
1and B
2, the additive trade names for using in bracket.
Table 1
Example 2
Following instance is prepared low temperature ashless anti-wear hydraulic oil of the present invention.
(1) prepare blending base oil
By low viscosity hydrogenated base oil, IV class base oil PAO10, V class base oil trihydroxymethylpropanyl ester, II class base oil 250N, polymethacrylate (Viscoplex 8-310) by 45: 20: 10: the mass ratio of 20: 5 is got ready.First 250N, PAO10 and trihydroxymethylpropanyl ester are added in the blending kettle with whipping appts, add again low viscosity hydrogenated base oil, 40 ℃ are stirred 30 minutes, then add polymethacrylate, being warming up to 60 ℃ stirs 30 minutes, filtration obtains blending base oil, and the quality percentage composition of its each component is in Table 2.
100 ℃ of viscosity of low viscosity hydrogenated base oil used are 2.324mm
2/ s, 40 ℃ of viscosity are 8.52mm
2/ s, viscosity index 79, pour point-48 ℃, 159 ℃ of open flash points, Noack evaporation mass loss (250 ℃, 1h) 82.6%, paraffinicity 36.99 quality %, total naphthene content 62.98 quality %, aromaticity content 0.03 quality % in composition.
100 ℃ of viscosity of PAO10 are 10.78mm
2/ s, 40 ℃ of viscosity are 71.91mm
2268 ℃ of/s, viscosity index 138, pour point-51 ℃, open flash point.
100 ℃ of viscosity of trihydroxymethylpropanyl ester are 5.316mm
2/ s, 40 ℃ of viscosity are 25.87mm
2225 ℃ of/s, viscosity index 144, pour point-54 ℃, open flash point.
100 ℃ of viscosity of 250N are 6.738mm
2/ s, 40 ℃ of viscosity are 44.16mm
2/ s, viscosity index 106, pour point-18 ℃, 232 ℃ of open flash points.
(2) prepare low temperature ashless anti-wear hydraulic oil
In the blending base oil making to (1) step, add the composite additive B that accounts for its total amount 1.5 quality %
2, dispersed with stirring is even, obtains meeting the ashless low temperature hydraulic oil of HV of 32 viscosity grades, and its performance is in Table 3.
Example 3
(1) prepare blending base oil
By the low viscosity hydrogenated base oil described in example 2, Yu-8 base oil, PAO10, poly-alpha-olefin pour depressant (T803), ethylene-propylene copolymer viscosity index improver (T618) by 45.0: 40.0: 10.2: the mass ratio of 0.3: 4.5 is got ready.First Yu-8, PAO10 are added in the blending kettle with whipping appts, then add low viscosity hydrogenated base oil, 40 ℃ are stirred 30 minutes, then add T803 and T618, be warming up to 60 ℃ and stir 30 minutes, filter and obtain blending base oil, the quality percentage composition of its each component is in Table 2.
100 ℃ of viscosity of hydrogenated base oil Yu-8 used are 7.861mm
2/ s, 40 ℃ of viscosity are 47.01mm
2256 ℃ of/s, viscosity index 128, pour point-12 ℃, open flash point.
(2) prepare low temperature ashless anti-wear hydraulic oil
In the blending base oil making to (1) step, add the composite additive B that accounts for its total amount 1.8 quality %
1, dispersed with stirring is even, obtains meeting the ashless low temperature hydraulic oil of HV of 32 viscosity grades, and its performance is in Table 3.
Example 4
(1) prepare blending base oil
By low viscosity hydrogenated base oil, 250N hydrogenated base oil, Yu-8 hydrogenated base oil, bright stock 150BS, polymethacrylate pour point depressant (T814) and ethylene-propylene copolymer viscosity index improver (P8230) by 35.0: 20.0: 30.5: the mass ratio of 10.0: 0.5: 4.0 is got ready.First 250N, Yu-8,150BS are added in the blending kettle with whipping appts, then add low viscosity hydrogenated base oil, 40 ℃ are stirred 30 minutes, then add T814 and P8230, be warming up to 60 ℃ and stir 30 minutes, filter and obtain blending base oil, the quality percentage composition of its each component is in Table 2.
100 ℃ of viscosity of low viscosity hydrogenated base oil used are 2.535mm
2/ s, 40 ℃ of viscosity are 9.73mm
2/ s, viscosity index 81, pour point-45 ℃, 165 ℃ of open flash points, (250 ℃ of Noack evaporation mass losses, 1h) 79.5%, paraffinicity 37.60 quality %, total naphthene content 62.35 quality %, aromaticity content 0.03 quality % in composition, sulfur mass fraction 0.02 quality %.
100 ℃ of viscosity of 150BS bright stock are 34.2mm
2293 ℃ of/s, pour point-9 ℃, open flash point.
(2) prepare low temperature ashless anti-wear hydraulic oil
In the blending base oil making to (1) step, add the composite additive B that accounts for its total amount 1.8 quality %
1, dispersed with stirring is even, obtains meeting the ashless low temperature hydraulic oil of HV of 46 viscosity grades, and its performance is in Table 3.
Example 5
(1) prepare blending base oil
By the low viscosity hydrogenated base oil described in example 4, Yu-8 hydrogenated base oil, bright stock 150BS, poly-alpha-olefin pour depressant (T803), second the third copolymerization viscosity index improver (L7) by 40: 44.4: 10.0: the mass ratio of 0.6: 5.0 is got ready.First Yu-8,150BS are added in the blending kettle with whipping appts, then add low viscosity hydrogenated base oil, 40 ℃ are stirred 30 minutes, then add T803 and L7, be warming up to 60 ℃ and stir 30 minutes, filter and obtain blending base oil, the quality percentage composition of its each component is in Table 2.
(2) prepare low temperature ashless anti-wear hydraulic oil
In the blending base oil making to (1) step, add the composite additive B that accounts for its total amount 1.5 quality %
2, dispersed with stirring is even, obtains meeting the ashless low temperature hydraulic oil of HV of 46 viscosity grades, and its performance is in Table 3.
Table 2
Table 3
Claims (14)
1. an ashless low temperature hydraulic oil, comprise blending base oil and composite additive, described blending base oil comprises the low viscosity hydrogenated base oil of 10～80 quality %, the IV of the mineral base oil of 10～80 quality %, 0～40 quality % and/or V class base oil, the viscosity index improver of 0.1～10 quality %, the pour point depressant of 0～5 quality %, 100 ℃ of viscosity of described low viscosity hydrogenated base oil are 1.5～3.0mm
2/ s, in its composition, paraffinicity is less than 40 quality %, always naphthene content is greater than 60 quality %, aromaticity content is less than 0.2 quality %, sulphur content is less than 0.05 quality %, described mineral base oil is selected from any two kinds in II class base oil, III class base oil, bright stock or described three class oil, and 100 ℃ of viscosity of II class～V class base oil used are greater than 3.6mm
2/ s, described composite additive comprise the extreme pressure anti-wear additives of 0.1～40 quality %, the sanitas of the oxidation inhibitor of 0.1～50 quality %, 0.1～10 quality %, the thinning oil of the low friction compound of 0.1～40 quality % and 1.0～60 quality %, the mass ratio of described composite additive and blending base oil is 0.1～10.0%.
2. according to low temperature hydraulic oil claimed in claim 1, it is characterized in that described blending base oil comprises the low viscosity hydrogenated base oil of 20～60 quality %, the IV of the mineral base oil of 15～50 quality %, 5～25 quality % and/or V class base oil, the viscosity index improver of 1～8 quality %, the pour point depressant of 0～1.0 quality %.
3. according to low temperature hydraulic oil claimed in claim 1, it is characterized in that described blending base oil comprises the low viscosity hydrogenated base oil of 20～60 quality %, the IV of the mineral base oil of 15～50 quality %, 0～25 quality % and/or V class base oil, the viscosity index improver of 1～8 quality %, the pour point depressant of 0.1～3.0 quality %.
4. according to any one low temperature hydraulic oil described in claim 1～3, it is characterized in that described composite additive comprises the extreme pressure anti-wear additives of 1.0～20 quality %, the sanitas of the oxidation inhibitor of 1.0～25 quality %, 0.5～5 quality %, the thinning oil of the low friction compound of 1.0～30 quality % and 30～55 quality %.
5. according to any one low temperature hydraulic oil described in claim 1～3, it is characterized in that described composite additive and the mass ratio of mediation base oil are 0.8～3.0%.
6. according to any one low temperature hydraulic oil described in claim 1～3, it is characterized in that described pour point depressant is selected from polyolefine pour point depressant, polymethacrylate pour point depressant or alkylnaphthalene.
7. according to any one low temperature hydraulic oil described in claim 1～3, it is characterized in that described viscosity index improver is selected from ethylene-propylene copolymer, polyisobutene or polymethacrylate viscosity index improver.
8. according to any one low temperature hydraulic oil described in claim 1～3, it is characterized in that described extreme pressure anti-wear additives is selected from one or more in triphenyl-thiophosphate, thiophosphatephosphorothioate, thiophosphoric acid amine salt, olefine sulfide, sulfo-amino ester.
9. according to any one low temperature hydraulic oil described in claim 1～3, it is characterized in that described oxidation inhibitor is selected from one or more in hindered phenol, alkyl diphenylamine, alkyl phenyl propionic ester.
10. according to low temperature hydraulic oil claimed in claim 9, it is characterized in that described hindered phenol is 2,6 ditertiary butyl p cresol.
11. according to any one low temperature hydraulic oil described in claim 1～3, it is characterized in that described sanitas is selected from one or more in carboxylic acid derivative, carboxylates derivatives, 124 Triazole derivative, thiadiazoles derivative.
12. according to any one low temperature hydraulic oil described in claim 1～3, it is characterized in that described low friction compound is selected from one or more in phosphoric acid ester, phosphonic acid ester, 124 Triazole derivative.
13. according to any one low temperature hydraulic oil described in claim 1～3, it is characterized in that it is 4.0～10.0mm that described thinning oil is selected from 100 ℃ of viscosity
2the base oil of/s.
14. according to the low temperature hydraulic oil described in claim 13, it is characterized in that described thinning oil is selected from I class, II class or III class base oil.
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| CN103343035B (en) * | 2013-07-25 | 2014-11-26 | 中国石油化工股份有限公司 | Hydraulic oil composition and method for preparing same |
| CN104232273A (en) * | 2014-10-08 | 2014-12-24 | 无锡阳工机械制造有限公司 | Low-temperature hydraulic oil |
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| CN101365774A (en) * | 2005-12-21 | 2009-02-11 | 雪佛龙美国公司 | Ashless oil lubricating oil with high oxidation stability |
| CN101827922A (en) * | 2007-08-28 | 2010-09-08 | 雪佛龙美国公司 | Hydraulic fluid compositions and preparation thereof |
| CN101855328A (en) * | 2007-09-27 | 2010-10-06 | 雪佛龙美国公司 | Tractor hydraulic fluid compositions and preparation thereof |
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