WO2002086035A1 - Functional fluids with servo valve erosion resistance - Google Patents
Functional fluids with servo valve erosion resistance Download PDFInfo
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- WO2002086035A1 WO2002086035A1 PCT/US2002/012838 US0212838W WO02086035A1 WO 2002086035 A1 WO2002086035 A1 WO 2002086035A1 US 0212838 W US0212838 W US 0212838W WO 02086035 A1 WO02086035 A1 WO 02086035A1
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- hydraulic fluid
- fluid composition
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
- C10M169/04—Mixtures of base-materials and additives
- C10M169/044—Mixtures of base-materials and additives the additives being a mixture of non-macromolecular and macromolecular compounds
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
- C10M169/04—Mixtures of base-materials and additives
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/02—Hydroxy compounds
- C10M2207/023—Hydroxy compounds having hydroxy groups bound to carbon atoms of six-membered aromatic rings
- C10M2207/026—Hydroxy compounds having hydroxy groups bound to carbon atoms of six-membered aromatic rings with tertiary alkyl groups
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/04—Ethers; Acetals; Ortho-esters; Ortho-carbonates
- C10M2207/042—Epoxides
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/28—Esters
- C10M2207/281—Esters of (cyclo)aliphatic monocarboxylic acids
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
- C10M2209/02—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C10M2209/08—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to a carboxyl radical, e.g. acrylate type
- C10M2209/084—Acrylate; Methacrylate
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2211/00—Organic non-macromolecular compounds containing halogen as ingredients in lubricant compositions
- C10M2211/06—Perfluorinated compounds
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
- C10M2215/02—Amines, e.g. polyalkylene polyamines; Quaternary amines
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
- C10M2215/02—Amines, e.g. polyalkylene polyamines; Quaternary amines
- C10M2215/06—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to carbon atoms of six-membered aromatic rings
- C10M2215/064—Di- and triaryl amines
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
- C10M2215/02—Amines, e.g. polyalkylene polyamines; Quaternary amines
- C10M2215/06—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to carbon atoms of six-membered aromatic rings
- C10M2215/064—Di- and triaryl amines
- C10M2215/065—Phenyl-Naphthyl amines
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
- C10M2219/04—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions containing sulfur-to-oxygen bonds, i.e. sulfones, sulfoxides
- C10M2219/044—Sulfonic acids, Derivatives thereof, e.g. neutral salts
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2223/00—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions
- C10M2223/02—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions having no phosphorus-to-carbon bonds
- C10M2223/04—Phosphate esters
- C10M2223/0405—Phosphate esters used as base material
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2223/00—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions
- C10M2223/02—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions having no phosphorus-to-carbon bonds
- C10M2223/04—Phosphate esters
- C10M2223/041—Triaryl phosphates
- C10M2223/0415—Triaryl phosphates used as base material
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2010/00—Metal present as such or in compounds
- C10N2010/02—Groups 1 or 11
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2020/00—Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
- C10N2020/01—Physico-chemical properties
- C10N2020/04—Molecular weight; Molecular weight distribution
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
- C10N2030/02—Pour-point; Viscosity index
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
- C10N2030/04—Detergent property or dispersant property
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
- C10N2030/06—Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
- C10N2030/10—Inhibition of oxidation, e.g. anti-oxidants
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2040/00—Specified use or application for which the lubricating composition is intended
- C10N2040/08—Hydraulic fluids, e.g. brake-fluids
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2040/00—Specified use or application for which the lubricating composition is intended
- C10N2040/12—Gas-turbines
- C10N2040/13—Aircraft turbines
Definitions
- This invention relates to phosphate ester fluids used in transmitting power in aircraft hydraulic systems. More specifically it relates to enhancing the anti-erosion properties of such fluids.
- Functional fluids are used in a wide variety of industrial applications. For example they are used as the power transmitting medium in hydraulic systems, such as aircraft hydraulic systems.
- Functional fluids intended for use in aircraft hydraulic systems must meet stringent performance criteria such as thermal stability, fire resistance, low susceptibility to viscosity changes over a wide range of temperatures, good hydrolytic stability, elastomer compatibility and good lubricity.
- Organic phosphate ester fluids have been recognized as a preferred fluid for use as a functional fluid such as in hydraulic fluids. Indeed, in present commercial aircraft hydraulic fluids phosphate esters are among the most commonly used base stocks.
- organic phosphate ester based fluids require the incorporation of various additives to enhance the performance of the fluid.
- various additives For example, experience has shown that orifices in the servo control valves of aircraft hydraulic systems are subject to erosion which is attributed to streaming current induced by fluid flow. Valve orifice erosion, if extensive, can greatly impair the functioning of the valve as a precise control mechanism. Therefore various additives have been used in functional fluids as erosion inhibitors. Nonetheless, there remains a need for increased choice of useful erosion inhibitors, especially for improved erosion inhibitors.
- One object of the present invention is to provide phosphate ester based aircraft hydraulic fluids with enhanced anti-erosion properties.
- a phosphate ester functional fluid is enhanced by incorporating in the fluid an erosion inhibiting an erosion inhibiting amount of an additive or mixture thereof having the formula
- M is preferably an alkali metal such as lithium, sodium, potassium, cesium. It could also be ammonium (NH 4 ).
- the R group consists of a perfluorinated hydrocarbyl group from 1 to 12 carbon atoms. Preferred are the Cl to C8 carbon atoms.
- the said hydrocarbyl group can be linear or branched.
- Example are metal salts of 1,1,2,2,3,3,4,4,4-nonafluorobutane-l-sulfonic acid.
- the preferred M is potassium.
- the anti-erosion properties of phosphate ester based functional fluids, especially aircraft hydraulic fluids, are enhanced by adding to the fluid an effective amount of a salt or mixture of salts represented by the formula where M is an alkali metal such as lithium, sodium, potassium, cesium. M can also be calcium or barium. It could also be ammonium (NH ).
- the R group consists of a perfluorinated hydrocarbyl group from 1 to 12 carbon atoms. Preferred are the Cl to C8.
- the low molecular weight metal salt of perfluoroalkyl sulfonic acid are very soluble in the phosphate ester base stock whereas the potassium 3,3,4,4,5,5,6,6,7,7,8,8,8- Tridecafluorooctane-1-sulfonate (Zonyl® FS-62) was found essentially not soluble. This is illstrated in Examples 2 and 3 (Fluid E). .
- the said hydrocarbyl group can be linear or branched.
- a preferred example is metal salts of 1,1, 2,2,3, 3, 4,4,4-nonafluorobutane-l -sulfonic acid.
- M is preferably an alkali metal and most preferably potassium.
- the preferred examples of this invention are: Potassium trifluoromethanesulfonate or potassium triflate; Lithium trifluoromethanesulfonate or lithium triflate Potassium 1, 1,2,2,2-pentafluoroethane-l-sulfonate-; Potassium 1 , 1 ,2,2,3 ,3 ,3 -heptafluoropropane- 1 -sulfonate- Potassium 1 , 1 ,2,2,3 ,3 ,4,4,4-nonafluorobutane- 1 -sulfonate-; Potassium 1,1,2,2,3,3,4,4,5,5,5-undecafluoropentane-l-sulfonate-; Potassium 1 , 1 ,2,2,3,3,4,4,5,5,6,6,6-tridecafluorohexane- 1 -sulfonate; Potassium 1,1,2,2,3,3,4,4,5,5,6,6,7,7,7-pentade
- additives are readily prepared by neutralization of the corresponding acid (i.e., a compound of the above formula except that M is H with an alkali metal hydroxide or quaternary ammonium hydroxide. Additives of the foregoing formula are also commercially available compounds.
- the anti-erosion additive is incorporated in the phosphate ester basestock in an amount sufficient to enhance the anti-erosive properties of the fluid.
- the addition comprises from about 0.01 wt% to about 0.5 wt% based on the weight of the basestock.
- Phosphate ester base stocks used in this invention refer to organo- phosphate esters selected from trialkyl phosphate, dialkyl aryl phosphate, alkyl diaryl phosphate and triaryl phosphate that contain from 3 to 8, preferably from 4 to 5 carbon atoms.
- Suitable phosphate esters useful in the present invention include, for example, tri-n-butyl phosphate, tri-isobutyl phosphate, n-butyl di-isobutyl phosphate, di-isobutyl n-butyl phosphate, n-butyl diphenyl phosphate, isobutyl diphenyl phosphate, di-n-butyl phenyl phosphate, di-isobutyl phenyl phosphate, tri-n-pentyl phosphate, tri-isopentyl phosphate, triphenyl phosphate, isopropylated triphenyl phosphates, and butylated triphenyl phosphates.
- the trialkyl phosphate esters are those of tri-n-butyl phosphate and tri-isobutyl phosphate.
- the amounts of each type of phosphate ester in the hydraulic fluid can vary depending upon the type of phosphate ester involved.
- the amount of trialkyl phosphate in the base stock fluid comprises from about 10 wt% to about 100 wt% preferably from about 20 wt% to about 90 wt%.
- the amount of dialkyl aryl phosphate in the base stock fluid is typically from 0 wt% to 75 wt% preferably from 0 wt% to about 50 wt%.
- the amount of alkyl diaryl phosphate in the base stock fluid is typically from 0 wt% to 30 wt%, preferably from 0 wt% to 10 wt%.
- the amount of triaryl phosphate in the base stock fluid is typically from 0 wt% to 20 wt% and preferably from 0 wt% to 15 wt%.
- the hydraulic fluids of this invention contain from 1 wt% to 20 wt% based on total weight composition of additives selected from one or more antioxidants, acid scavengers, VI improvers, rust inhibitors, defoamers.
- additives selected from one or more antioxidants, acid scavengers, VI improvers, rust inhibitors, defoamers.
- Antioxidants useful in hydraulic fluid compositions in this invention include, for example, polyphenols, trialkylphenols and di (alkylphenyl) amines, examples of which include bis (3,5-di-tert-butyl-4- hydroxyphenyl) methane, l,3,5-trimethyl-2,4,6-tris (3,5-di-tert-butyl-4- hydroxyphenyl) benzene, 2,6-di-tert-butyl-4-methylphenol, tetrakis (methylene (3,5-di-tert-butyl-4-;hydroxyhydrocinnamate) methane, and di (n-octylphenyl) amine.
- Typical amounts for each type of antioxidants can be from about 0.1 wt% to 2 wt%.
- Acid scavengers useful in hydraulic fluid compositions of this invention to neutralize phosphoric acid and dialkyl phosphoric acid produced from the hydrolysis and thermal degradation of the phosphate ester base stocks include epoxy compounds such as epoxycyclo- hexane carboxylates. Typical amounts that can be used as acid scavenger can be from about 1 to about 10 wt% based on the total weight of hydraulic fluid.
- This example illustrates the preparation of an additive of the present invention.
- To 100 g of sulfonic acid in 750 ml methanol is added with stirring enough of the corresponding alkali metal hydroxide to neutralize the acid.
- the methanol is removed by flushing the solution with nitrogen at 40 °C.
- the product salt is then dried in a vacuum oven at 70-80 °C for 24 hours.
- This example describes the functional fluids containing an alkali metal salt of a perfluoroalkyl sulfonate.
- the following functional fluids can be prepared by incorporating the particular salt into a tributyl phosphate, triarylphosphate base oil containing conventional VI improver, epoxide acid scavenger, antioxidant rust inhibitor and difoamer.
- FC-98 is currently used in commercial aviation phosphate esters and has been used in Fluids D and F as a comparison.
- FC-98 is a potassium perfluoroalkylsulfonate where R is a cyclohexanic ring. Examples of salts are shown in Table 1.
- the anti-erosion additive provides electrical conductivity which is essential for the anti-erosion performance of the fluids.
- the example also shows an excellent solubility of the anti-erosion additive in the phosphate ester fluid.
- This example shows the effectiveness of the compositions of this invention to prevent erosion of the servo valve.
- the fluids used were those described in Example 2.
- the erosion rig test was performed according to the Boeing BMS 3-11L specifications. The tests were run at 225F and supplied pressure was maintained at 3000 psi at the exception of Fluid D which has been run at 275F. About 1000 ppm chlorine as 1,1,1-trichloroethane (methyl chloroform) was added after about 200 run hours. About 200 ppm chloride was used for Fluid D because it was run at higher temperature according to BMS 3- 11L specifications.
- the servo valve edge was analyzed by SEM to confirm the presence of any servo valve edge electro-chemical erosion.
- the results of the tests of the various functional fluids containing the perfluorinated alkylsulfonic metal salt of this invention are presented in Table 4. TABLE4
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- Chemical & Material Sciences (AREA)
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- Lubricants (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA2443961A CA2443961C (en) | 2001-04-20 | 2002-04-12 | Functional fluids with servo valve erosion resistance |
EP02721804A EP1397471A4 (en) | 2001-04-20 | 2002-04-12 | Functional fluids with servo valve erosion resistance |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US28510501P | 2001-04-20 | 2001-04-20 | |
US60/285,105 | 2001-04-20 | ||
US10/122,049 US20030040443A1 (en) | 2001-04-20 | 2002-04-12 | Functional fluids with servo valve erosion resistance |
US10/122,049 | 2002-04-12 |
Publications (1)
Publication Number | Publication Date |
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WO2002086035A1 true WO2002086035A1 (en) | 2002-10-31 |
Family
ID=26820095
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2002/012838 WO2002086035A1 (en) | 2001-04-20 | 2002-04-12 | Functional fluids with servo valve erosion resistance |
Country Status (4)
Country | Link |
---|---|
US (1) | US20030040443A1 (en) |
EP (1) | EP1397471A4 (en) |
CA (1) | CA2443961C (en) |
WO (1) | WO2002086035A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2102632B1 (en) * | 2006-12-18 | 2011-11-09 | Airbus Opérations SAS | Online sensor for monitoring chemical contaminations in hydraulic fluids |
EP2829595A1 (en) * | 2013-07-23 | 2015-01-28 | The Boeing Company | Redox couple-based mitigation of fluid-flow-driven electrochemical surface degradation in phosphate-ester based hydraulic systems |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20170158981A1 (en) | 2015-12-07 | 2017-06-08 | Exxonmobil Research And Engineering Company | Functional fluid compositions containing erosion inhibitors |
JP6965096B2 (en) * | 2017-10-19 | 2021-11-10 | コスモ石油ルブリカンツ株式会社 | Conductive Lubricating Oil Composition and Spindle Motor |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3679587A (en) * | 1970-03-10 | 1972-07-25 | Monsanto Co | Functional fluid compositions containing perfluoro surfactants |
US4324674A (en) * | 1980-08-28 | 1982-04-13 | Chevron Research Company | Amine salt stabilized phosphate ester-based functional fluid |
US5817606A (en) * | 1996-08-08 | 1998-10-06 | Rohm And Haas Company | Viscosity index improving additives for phosphate ester-containing hydraulic fluids |
US6030543A (en) * | 1993-03-04 | 2000-02-29 | Great Lakes Chemical Corporation | Aircraft hydraulic fluid basestocks |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU5294696A (en) * | 1994-12-09 | 1996-06-26 | Chevron U.S.A. Inc. | Hydraulic fluids for use in aircraft |
AU761121B2 (en) * | 1998-11-10 | 2003-05-29 | Exxonmobil Research And Engineering Company | Phosphate ester base stocks comprising mixed (N)-butyl/isobutyl phosphate esters and aircraft hydraulic fluids comprising the same |
-
2002
- 2002-04-12 WO PCT/US2002/012838 patent/WO2002086035A1/en not_active Application Discontinuation
- 2002-04-12 CA CA2443961A patent/CA2443961C/en not_active Expired - Fee Related
- 2002-04-12 EP EP02721804A patent/EP1397471A4/en not_active Withdrawn
- 2002-04-12 US US10/122,049 patent/US20030040443A1/en not_active Abandoned
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3679587A (en) * | 1970-03-10 | 1972-07-25 | Monsanto Co | Functional fluid compositions containing perfluoro surfactants |
US4324674A (en) * | 1980-08-28 | 1982-04-13 | Chevron Research Company | Amine salt stabilized phosphate ester-based functional fluid |
US6030543A (en) * | 1993-03-04 | 2000-02-29 | Great Lakes Chemical Corporation | Aircraft hydraulic fluid basestocks |
US5817606A (en) * | 1996-08-08 | 1998-10-06 | Rohm And Haas Company | Viscosity index improving additives for phosphate ester-containing hydraulic fluids |
Non-Patent Citations (1)
Title |
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See also references of EP1397471A4 * |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2102632B1 (en) * | 2006-12-18 | 2011-11-09 | Airbus Opérations SAS | Online sensor for monitoring chemical contaminations in hydraulic fluids |
EP2829595A1 (en) * | 2013-07-23 | 2015-01-28 | The Boeing Company | Redox couple-based mitigation of fluid-flow-driven electrochemical surface degradation in phosphate-ester based hydraulic systems |
CN104343769A (en) * | 2013-07-23 | 2015-02-11 | 波音公司 | Redox couple-based mitigation of fluid-flow-driven electrochemical surface degradation in phosphate-ester based hydraulic systems |
US9546338B2 (en) | 2013-07-23 | 2017-01-17 | The Boeing Company | Redox couple-based mitigation of fluid-flow-driven electrochemical surface degradation |
EP3118288A1 (en) * | 2013-07-23 | 2017-01-18 | The Boeing Company | Redox couple-based mitigation of electrochemical surface degradation in phosphate-ester based hydraulic systems |
US9650586B2 (en) | 2013-07-23 | 2017-05-16 | The Boeing Company | Redox couple-based mitigation of fluid-flow-driven electrochemical surface degradation |
RU2693130C2 (en) * | 2013-07-23 | 2019-07-01 | Зе Боинг Компани | Reduced electrochemical destruction of surface caused by liquid flow, using redox pairs |
Also Published As
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US20030040443A1 (en) | 2003-02-27 |
EP1397471A4 (en) | 2009-07-22 |
CA2443961A1 (en) | 2002-10-31 |
EP1397471A1 (en) | 2004-03-17 |
CA2443961C (en) | 2011-07-05 |
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