US3726798A - Hydraulic fluid containing basic zinc carboxylates - Google Patents

Hydraulic fluid containing basic zinc carboxylates Download PDF

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Publication number
US3726798A
US3726798A US00134077A US3726798DA US3726798A US 3726798 A US3726798 A US 3726798A US 00134077 A US00134077 A US 00134077A US 3726798D A US3726798D A US 3726798DA US 3726798 A US3726798 A US 3726798A
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Prior art keywords
zinc
hydraulic fluid
basic zinc
dithiophosphate
silver
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US00134077A
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H Silver
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BP PLC
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BP PLC
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    • C10M3/00—Liquid compositions essentially based on lubricating components other than mineral lubricating oils or fatty oils and their use as lubricants; Use as lubricants of single liquid substances
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    • C07F9/00—Compounds containing elements of Groups 5 or 15 of the Periodic Table
    • C07F9/02—Phosphorus compounds
    • C07F9/06—Phosphorus compounds without P—C bonds
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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
    • C10M2227/00—Organic non-macromolecular compounds containing atoms of elements not provided for in groups C10M2203/00, C10M2207/00, C10M2211/00, C10M2215/00, C10M2219/00 or C10M2223/00 as ingredients in lubricant compositions
    • C10M2227/02—Esters of silicic acids
    • 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
    • C10M2229/00—Organic macromolecular compounds containing atoms of elements not provided for in groups C10M2205/00, C10M2209/00, C10M2213/00, C10M2217/00, C10M2221/00 or C10M2225/00 as ingredients in lubricant compositions
    • C10M2229/02—Unspecified siloxanes; Silicones
    • 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
    • C10M2229/00—Organic macromolecular compounds containing atoms of elements not provided for in groups C10M2205/00, C10M2209/00, C10M2213/00, C10M2217/00, C10M2221/00 or C10M2225/00 as ingredients in lubricant compositions
    • C10M2229/04—Siloxanes with specific structure
    • C10M2229/05—Siloxanes with specific structure containing atoms other than silicon, hydrogen, oxygen or carbon
    • 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
    • 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
    • C10N2010/04—Groups 2 or 12
    • 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

Definitions

  • This invention relates to an improved hydraulic fluid.
  • Hydraulic fluids are fluids intended for use in hydraulic fluid power systems.
  • hydraulic fluids should be noncorrosive towards metallic surfaces with which they come into contact.
  • Hydraulic pumps may contain slipper pads plated with silver to reduce wear and unfortunately these are attacked by reactive sulphur containing compounds.
  • British patent specification 959115 discloses a new class of zinc dithiophosphate additives which are stated to be non-corrosive to silver.
  • the class comprises two types of zinc dithiophosphate salts, viz, 1) normal size bis- (aryl)-dithiophosphates and (2) normal zinc bis-(alkyl) dithiophosphates prepared from so-called neoor hindered-type alcohols, i.e. alcohols in which the carbon atom adjacent to the carbon atom attached to the hydroxyl group is completely substituted with alkyl groups.
  • Suitable zinc dihydrocarbyl dithiophosphates include zinc di-n-butyl dithiophosphate, zinc di-n-pentyl dithiophosphate, zinc di-isohexyldithiophosphate, zinc di-4- methylpent-Z-yl dithiophosphate, zinc di-p-octylphenyl di thiophosphate and zinc di-isohexylphenyldithiophosphate.
  • Suitable basic zinc carboxylates are described in British patent specification 1,142,195 and include basic zinc octanoate, basic zinc 2-ethylhexanoate, basic zinc versatate and basic zinc oleate.
  • the complex may simply be prepared by mixing component (A) with component (B). If the complex is to be used as an additive then the components may be mixed before or after being added to the base stock.
  • British patent specification 959,115 discloses a method in which the zinc carboxylate and zinc dithiophosphate are heated in the presence of Water and a hydrocarbon solvent and water is distilled off to obtain a solution of the complex salt.
  • the components are suitably mixed in a ratio in the range 1 to 5, preferably 1 to 1.
  • Zinc dihydrocarbyl dithiophosphates with various hydrocarbyl radicals are readily available from additive ma ufacturers under a variety of trade names.
  • Basic carboxylates may be prepared by reacting one mole of proportion of zinc oxide w th 1.5 moles of proportions of an acid of formula R COOH, wherein R is as previously defined. Details of the preparation of these compounds are given in British patent specification 1,142,195.
  • the complexes are very suitable for use as load-carrying additives to hydraulic fluids which are substantially non-corrosive to silver.
  • a hydraulic fluid comprising a major proportion of a base oil and a minor proportion of a complex as hereinbefore described.
  • the fluid contains 0.1 to 5%, preferably 0.5 to 2% by weight of the complex.
  • the base stock may be a mineral oil or a synthetic material.
  • Suitable mineral oils are parafiinic oils of viscosity in the range 2.0 to 20 cst. at 98.8 C.
  • the preferred mineral oil is characterized by a viscosity of 5 cst. at 98.8 C.
  • Suitable synthetic bases include esters of phosphorus containing acids, e.g., triaryl phosphates, silicate esters, halogenated hydrocarbons, e.g. chlorinated diphenyl, esters of organic acids with alcohols or phenols, and polyalkylene glycols.
  • esters of phosphorus containing acids e.g., triaryl phosphates, silicate esters, halogenated hydrocarbons, e.g. chlorinated diphenyl, esters of organic acids with alcohols or phenols, and polyalkylene glycols.
  • pour point depressant may be necessary.
  • Suitable pour point depressants include n-alkylated aromatic compounds. They are conveniently used in amount 0.1 to 2% by wt.
  • the hydraulic fluid should contain a small amount e.g., 0.0l0.5% by weight of a rust inhibitor.
  • Suitable rust inhibitors include alkenyl succinic acids, alkyl mercapto acidic acids and alkaryloxy acetic acids.
  • hydraulic oil additives which may be used to advantage in specific uses of the hydraulic oil include viscosity index improvers, e.g., polyisobutenes, polyalkylmethacrylates and polyalkyl-styrenes, and antifoam agents, e.g., silicone fluids.
  • viscosity index improvers e.g., polyisobutenes, polyalkylmethacrylates and polyalkyl-styrenes
  • antifoam agents e.g., silicone fluids.
  • R is an alkyl, cycloalkyl, aryl, aralkyl or alkaryl group preferably having not more than 24 carbon atoms, the compound having a tetrahedral structure with the 4 zinc atoms at the corners, the oxygen atom in the centre and the 6 carboxylate groups arranged along the sides, the molar ratio of component (A) to component (B) being in the range of 1:1 to 1:5.
  • a hydraulic fluid according to claim 1 which contains 0.5 to 2% by weight of the complex.
  • R is an alkyl group having up to 18 carbon atoms.
  • said zinc dihydrocarbyl dithiophos'phate of said complex is zinc di-n-butyl dithiophosphate, zinc di-n-pentyl dithiophosphate, zinc di-isohexyl dithiophosphate, zinc di-4- methylpent-Z-yl dithiophosphate, zinc di-p-octylphenyl dithiophosphate or zinc di-isohexylphenyl dithiophosphate.
  • said basic zinc carboxylate of said complex is basic zinc octanoate, basic zinc Z-ethylhexanoate, basic zinc versatate or basic zinc oleate.
  • NoTE.-Anglamo1 75 is a rust inhibiting, anti-wear, antioxidant and anti-corrosive package sold by the Lubrizol Corporation. It contains zinc dialkyl dithiophosphate.
  • Lubrizol (R 0) (R 0) PSSZnSPS (0R (0R wherein R -R are alkyl groups containing 2 to 18 carbon atoms, aryl groups containing 6-12 carbon atoms or alkaryl groups containing 7-15 carbon atoms, with (B) a 1360 is a similar composition sold by the Lnbrlzol Corporation.
  • the base oil is as previously described for Examples 1-8.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Molecular Biology (AREA)
  • Lubricants (AREA)
US00134077A 1970-04-28 1971-04-14 Hydraulic fluid containing basic zinc carboxylates Expired - Lifetime US3726798A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2032070 1970-04-28

Publications (1)

Publication Number Publication Date
US3726798A true US3726798A (en) 1973-04-10

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ID=10144026

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Country Status (6)

Country Link
US (1) US3726798A (enExample)
BE (1) BE766413A (enExample)
DE (1) DE2120093A1 (enExample)
FR (1) FR2090705A5 (enExample)
GB (1) GB1317812A (enExample)
NL (1) NL7105667A (enExample)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4085053A (en) * 1977-05-23 1978-04-18 Standard Oil Company (Indiana) Metal dithiophosphate process and/composition
US4308154A (en) * 1979-05-31 1981-12-29 The Lubrizol Corporation Mixed metal salts and lubricants and functional fluids containing them
US4417990A (en) * 1979-05-31 1983-11-29 The Lubrizol Corporation Mixed metal salts/sulfurized phenate compositions and lubricants and functional fluids containing them
US4592851A (en) * 1980-09-02 1986-06-03 Exxon Research And Engineering Co. Lubricating oil composition and method for providing improved thermal stability
EP0322235A3 (en) * 1987-12-23 1990-03-28 Exxon Chemical Patents Inc. Dithiophosphates
US5604188A (en) * 1994-09-26 1997-02-18 Ethyl Petroleum Additives Limited Zinc additives of enhanced performance capabilities
JP2020002020A (ja) * 2018-06-25 2020-01-09 住友ゴム工業株式会社 錯体および錯体の製造方法

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4085053A (en) * 1977-05-23 1978-04-18 Standard Oil Company (Indiana) Metal dithiophosphate process and/composition
US4308154A (en) * 1979-05-31 1981-12-29 The Lubrizol Corporation Mixed metal salts and lubricants and functional fluids containing them
US4417990A (en) * 1979-05-31 1983-11-29 The Lubrizol Corporation Mixed metal salts/sulfurized phenate compositions and lubricants and functional fluids containing them
US4592851A (en) * 1980-09-02 1986-06-03 Exxon Research And Engineering Co. Lubricating oil composition and method for providing improved thermal stability
EP0322235A3 (en) * 1987-12-23 1990-03-28 Exxon Chemical Patents Inc. Dithiophosphates
US5013465A (en) * 1987-12-23 1991-05-07 Exxon Chemical Patents, Inc. Dithiophosphates
US5604188A (en) * 1994-09-26 1997-02-18 Ethyl Petroleum Additives Limited Zinc additives of enhanced performance capabilities
EP0713907A3 (en) * 1994-09-26 1997-05-07 Ethyl Petroleum Additives Ltd Zinc-containing additives with improved performance
JP2020002020A (ja) * 2018-06-25 2020-01-09 住友ゴム工業株式会社 錯体および錯体の製造方法

Also Published As

Publication number Publication date
DE2120093A1 (de) 1971-11-11
FR2090705A5 (enExample) 1972-01-14
NL7105667A (enExample) 1971-11-01
GB1317812A (en) 1973-05-23
BE766413A (fr) 1971-10-28

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