US20040116306A1 - Hydraulic fluids with improved anti-corrosion properties - Google Patents
Hydraulic fluids with improved anti-corrosion properties Download PDFInfo
- Publication number
- US20040116306A1 US20040116306A1 US10/469,770 US46977003A US2004116306A1 US 20040116306 A1 US20040116306 A1 US 20040116306A1 US 46977003 A US46977003 A US 46977003A US 2004116306 A1 US2004116306 A1 US 2004116306A1
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- Prior art keywords
- weight
- triazole
- fluids
- tolutriazole
- hydraulic fluids
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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
- 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
- C10M2227/06—Organic compounds derived from inorganic acids or metal salts
- C10M2227/061—Esters derived from boron
- C10M2227/0615—Esters derived from boron used as base material
-
- 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
- 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
- C10M2227/06—Organic compounds derived from inorganic acids or metal salts
- C10M2227/061—Esters derived from boron
- C10M2227/062—Cyclic esters
-
- 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
- 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
- C10M2227/06—Organic compounds derived from inorganic acids or metal salts
- C10M2227/061—Esters derived from boron
- C10M2227/062—Cyclic esters
- C10M2227/0625—Cyclic esters used as base material
-
- 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
- the present invention relates to hydraulic fluids, in particular brake fluids for motor vehicles, having improved corrosion protection which comprise
- Hydraulic fluids and in particular brake fluids for motor vehicles are subject to very high requirements with respect to their chemical and physical properties.
- modern brake fluids should on the one hand have high dry boiling points (equilibrium reflux boiling points “ERBP”) and high wet boiling points (“wet ERBP”), but on the other hand should also have a viscosity which changes only slightly within a broad temperature range.
- 1H-1,2,3-triazoles such as 1H-1,2,3-benzotriazole or 1H-1,2,3-tolutriazole
- corrosion inhibitors in hydraulic fluids or brake fluids has been known for some time, for example from EP-A 028 789 (1) and EP-A 454 110 (2).
- WO 00/46325 (3) recommends hydraulic fluids which comprise a combination of 1H-1,2,3-benzotriazole or derivatives thereof, such as 1H-1,2,3-tolutriazole, and 1H-1,2,4-triazole or derivatives thereof in a weight ratio of from 1:4 to 4:1 as corrosion inhibitor system.
- Tables 1 to 4 in (3) also indicate hydraulic fluids which comprise 1H-1,2,4-triazole alone in concentrations of 0.15% by weight; however, its corrosion-inhibiting action is acceptable only in the case of copper.
- the hydraulic fluids in particular motor vehicle brake fluids, according to the invention preferably comprise from 0.005 to 0.10% by weight, preferably from 0.005 to 0.08% by weight, in particular from 0.005 to 0.06% by weight, of component (a).
- the hydraulic fluids in particular motor vehicle brake fluids, according to the invention comprise component (a) as the only triazole-based corrosion inhibitor.
- component (a) as the only triazole-based corrosion inhibitor.
- triazoles such as 1H-1,2,3-benzotriazole, 1H-1,2,3-tolutriazole or hydrogenated 1H-1,2,3-tolutriazole, are excluded here, but inorganic and/or organic corrosion inhibitors having a different structure may be present.
- the hydraulic fluids in particular motor vehicle brake fluids, according to the invention also comprise up to 10% by weight, in particular up to 5% by weight, of one or more further corrosion inhibitors (b), where, in the case of the concomitant use of 1H-1,2,3-benzotriazole and/or 1H-1,2,3-tolutriazole and/or derivatives thereof, the weight ratio between 1H-1,2,4-triazole and said 1H-1,2,3-triazoles must be greater than 4:1.
- b further corrosion inhibitors
- Suitable further corrosion inhibitors (b) here are, in particular, alkali metal salts of phosphoric acid and phosphorous acid, fatty acids, such as caprylic, lauric, palmitic, stearic or oleic acid and alkali metal salts thereof, esters of phosphoric acid and phosphorous acid, such as ethyl phosphate, dimethyl phosphate, isopropyl phosphate, diisopropyl phosphate, butyl phosphite or dimethyl phosphite, substituted or unsubstituted ethoxylated mono- and dialkylamines and salts thereof with mineral acids and fatty acids, for example butylamine, hexylamine, octylamine, isononylamine, oleylamine, dipropylamine, diisopropylamine or dibutylamine, substituted or unsubstituted ethoxylated alkanolamines, for example
- Said corrosion inhibitors (b) are preferably present in the hydraulic fluids, in particular motor vehicle brake fluids, according to the invention in amounts of from 0.001 to 10% by weight, in particular from 0.001 to 5% by weight.
- the hydraulic fluids in particular motor vehicle brake fluids, according to the invention comprise, besides 1H-1,2,4-triazole (a), from 0.001 to 5% by weight, in particular from 0.001 to 0.5% by weight, of one or more compounds from the group consisting of benzimidazole, hydrogenated 1H-1,2,3-tolutriazole, purine, adenine, 6-chloropurine, 2,6-dichloropurine, 6-methoxypurine, 1H-1,2,3-triazolo(4,5-b)pyridine, 6-histaminopurine and 6-furfurylaminopurine and, if desired, further corrosion inhibitors other than (a) as additional corrosion inhibitors (b).
- Said purine derivatives are described in German Patent Application P 100 26 010.1 as non-ferrous metal corrosion inhibitors for hydraulic fluids or brake fluids.
- the present invention relates, in particular, to brake fluids for motor vehicles which comprise, as corrosion inhibitors, said components (a) and, if desired, (b).
- the motor vehicle brake fluids according to the invention furthermore comprise, in addition to components (a) and, if desired, (b), from 0.1 to 97% by weight, in particular from 30 to 97% by weight, especially from 50 to 97% by weight, of one or more polyglycol ethers and/or borates thereof.
- Suitable polyglycol ethers are, in particular, ethylene glycol monoalkyl ethers having up to 6 ethylene oxide units and having up to 4 carbon atoms in the alkyl radical, for example diethylene glycol monomethyl ether, triethylene glycol monomethyl ether, triethylene glycol monobutyl ether or tetraethylene glycol monomethyl ether.
- ethylene glycol dialkyl ethers and propylene glycol dialkyl ethers having up to 6 alkylene oxide units and having up to 4 carbon atoms in each of the alkyl radicals, for example triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, diethylene glycol di-tert-butyl ether, diethylene glycol dibutyl ether, diethylene glycol di-tert-butyl ether or dipropylene glycol dimethyl ether.
- Suitable boric acid esters of said or other polyglycol ethers are described, in particular, in the specifications EP-B 013 925 (cyclic bisboric acid esters), DE-C 28 04 535 (nitrogen-containing boric acid esters), DE-A 24 38 038 (boric acid alkylene glycol monoalkyl ether esters) and DE-B 17 68 933 (boric acid trisalkoxyalkyl esters).
- the motor vehicle brake fluids according to the invention may also comprise, as principal component, those based on carboxylic acid esters, mineral oils or silicone oils.
- the motor vehicle brake fluids according to the invention furthermore comprise, besides components (a) and, if desired, (b), from 0.1 to 50% by weight, in particular from 1 to 40% by weight, especially from 5 to 30% by weight, of one or more polyglycols.
- Suitable polyglycols here are, in particular, relatively high-boiling products of the reaction of ethylene oxide and/or propylene oxide and/or butylene oxide with water or diols, in particular corresponding products of the mixtures of ethylene oxide and propylene oxide with water.
- the number of alkylene oxide units in polyglycols of this type is normally from 2 to 10.
- the action of these high-boiling polyglycols is that of a lubricant, which is attributable essentially to an improvement in the temperature/viscosity behavior.
- the polyglycols give the low-viscosity polyglycol ethers sufficient viscosity at high temperatures and thus ensure adequate lubrication. Adequate lubrication is necessary in the components of the motor vehicle braking system since rubber or elastomers have to slide on metal with very low wear in these systems.
- Further components and assistants in the motor vehicle brake fluids according to the invention can be conventional antioxidants, for example phenothiazine and/or those based on phenol, and conventional antifoams.
- the brake fluids according to the invention may comprise the cyclic carboxylic acid derivatives mentioned in WO 00/65001, which are suitable as components for reducing the low-temperature viscosity in the presence of water.
- hydraulic fluids or motor vehicle brake fluids according to the invention are their favorable low-temperature viscosity, good water compatibility, a mild pH, good low-temperature, high-temperature and oxidation stability and good chemical stability, a favorable behavior (i.e. good compatibility) with materials such as rubbers, plastics, glue lines, fiber, elastomer and rubber seals and similar materials, as well as good lubricating behavior.
- the motor vehicle brake fluids used had the following compositions:
- Brake fluids BF 1a and BF 2a according to the invention differ from BF 1 and BF 2 only in that the 0.05% by weight of 1H-1,2,3-tolutriazole has been replaced by the same amount of 1H-1,2,4-triazole; brake fluid BF 1b comprises 0.04% by weight of 1H-1,2,4-triazole and 0.01% by weight of adenine instead of 0.05% by weight of 1H-1,2,3-tolutriazole; brake fluid BF 1c according to the invention comprises 0.07% by weight of 1H-1,2,4-triazole (but only 54.98% by weight of triethylene glycol monomethyl ether borate) instead of 0.05% by weight of 1H-1,2,3-tolutriazole.
- the formulations according to the invention in contrast to conventional brake fluids, such as BF 1 and BF 2, not only offer very good copper corrosion protection with a low Cu content in the test fluid, but in addition also produce a coating-free metal surface and no sediment formation in the brake fluid.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Emergency Medicine (AREA)
- Lubricants (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
- Braking Arrangements (AREA)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10117647A DE10117647A1 (de) | 2001-04-09 | 2001-04-09 | Hydraulische Flüssigkeiten mit verbessertem Korrosionsschutz |
DE10117647.3 | 2001-04-09 | ||
PCT/EP2002/003671 WO2002081604A1 (de) | 2001-04-09 | 2002-04-03 | Hydraulische flüssigkeiten mit verbessertem korrosionsschutz |
Publications (1)
Publication Number | Publication Date |
---|---|
US20040116306A1 true US20040116306A1 (en) | 2004-06-17 |
Family
ID=7680939
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/469,770 Abandoned US20040116306A1 (en) | 2001-04-09 | 2002-04-03 | Hydraulic fluids with improved anti-corrosion properties |
Country Status (21)
Country | Link |
---|---|
US (1) | US20040116306A1 (cs) |
EP (1) | EP1379615B1 (cs) |
JP (1) | JP4116445B2 (cs) |
KR (1) | KR100861969B1 (cs) |
CN (1) | CN1312261C (cs) |
AR (1) | AR033453A1 (cs) |
AT (1) | ATE286112T1 (cs) |
AU (1) | AU2002308121B2 (cs) |
BR (1) | BR0208415A (cs) |
CA (1) | CA2442697C (cs) |
CZ (1) | CZ299651B6 (cs) |
DE (2) | DE10117647A1 (cs) |
ES (1) | ES2235077T3 (cs) |
HU (1) | HUP0303757A2 (cs) |
MX (1) | MXPA03007944A (cs) |
NO (1) | NO325635B1 (cs) |
PL (1) | PL197796B1 (cs) |
PT (1) | PT1379615E (cs) |
SK (1) | SK286828B6 (cs) |
WO (1) | WO2002081604A1 (cs) |
ZA (1) | ZA200308690B (cs) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20070093395A1 (en) * | 2005-10-21 | 2007-04-26 | Habeeb Jacob J | Antiwear inhibiting and load enhancing additive combinations for lubricating oils |
US20070171569A1 (en) * | 2006-01-23 | 2007-07-26 | Burns John M | System and method for reducing corrosion in a fluid dynamic bearing |
CN107557121A (zh) * | 2017-08-15 | 2018-01-09 | 杭州天汇精细化工有限公司 | 一种汽车制动液及其生产方法 |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20080025192A (ko) * | 2005-07-01 | 2008-03-19 | 다우 글로벌 테크놀로지스 인크. | 저점도 기능성 유체 |
EP2159274B1 (en) | 2007-05-24 | 2013-04-17 | Chiyoda Chemical Co. Ltd | Brake fluid containing tetrazole |
US10669503B2 (en) | 2014-02-25 | 2020-06-02 | Jon A. Petty | Corrosion inhibiting hydraulic fluid additive |
EP3111194A4 (en) * | 2014-02-25 | 2018-03-14 | Jon A. Petty | Corrosion inhibiting hydraulic fluid additive |
CN111676082A (zh) * | 2020-05-11 | 2020-09-18 | 江苏龙蟠科技股份有限公司 | 一种用于esp汽车控制系统的制动液及其制备方法 |
US11788026B2 (en) | 2021-07-28 | 2023-10-17 | Afton Chemical Corporation | Hydraulic fluid |
US12018224B2 (en) | 2021-07-28 | 2024-06-25 | Afton Chemical Corporation | Hydraulic fluid |
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US5681506A (en) * | 1992-10-30 | 1997-10-28 | Castrol Limited | Corrosion inhibiting lubricant composition |
US6074992A (en) * | 1999-02-02 | 2000-06-13 | Union Carbide Chemicals & Plastics Technology Corporation | Functional fluid compositions |
US6984340B1 (en) * | 1999-10-14 | 2006-01-10 | Brad-Chem Technology Limtied | Corrosion inhibiting formulations |
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DE2945094A1 (de) * | 1979-11-08 | 1981-05-21 | Hoechst Ag, 6000 Frankfurt | Hydraulische fluessigkeit mit verbesserten eigenschaften |
DE4013243A1 (de) * | 1990-04-26 | 1991-10-31 | Hoechst Ag | Gegen metallkorrosion inhibierte bremsfluessigkeiten auf der basis von glykolverbindungen |
AU4183896A (en) * | 1994-12-23 | 1996-07-19 | Cookson Group Plc | Process for the corrosion protection of copper or copper alloys |
FR2733509B1 (fr) * | 1995-04-28 | 1997-07-04 | Bp Chemicals Snc | Composition d'antigel et fluide aqueux comprenant la composition |
DE10026010A1 (de) * | 2000-05-25 | 2001-11-29 | Basf Ag | Hydraulische Flüssigkeiten mit verbessertem Korrosionsschutz für Buntmetalle |
-
2001
- 2001-04-09 DE DE10117647A patent/DE10117647A1/de not_active Withdrawn
-
2002
- 2002-04-03 MX MXPA03007944A patent/MXPA03007944A/es active IP Right Grant
- 2002-04-03 PL PL367159A patent/PL197796B1/pl not_active IP Right Cessation
- 2002-04-03 CN CNB028079027A patent/CN1312261C/zh not_active Expired - Fee Related
- 2002-04-03 KR KR1020037013131A patent/KR100861969B1/ko not_active Expired - Fee Related
- 2002-04-03 AT AT02759789T patent/ATE286112T1/de active
- 2002-04-03 EP EP02759789A patent/EP1379615B1/de not_active Expired - Lifetime
- 2002-04-03 DE DE50201902T patent/DE50201902D1/de not_active Expired - Lifetime
- 2002-04-03 AU AU2002308121A patent/AU2002308121B2/en not_active Ceased
- 2002-04-03 PT PT02759789T patent/PT1379615E/pt unknown
- 2002-04-03 WO PCT/EP2002/003671 patent/WO2002081604A1/de active IP Right Grant
- 2002-04-03 ES ES02759789T patent/ES2235077T3/es not_active Expired - Lifetime
- 2002-04-03 CA CA2442697A patent/CA2442697C/en not_active Expired - Fee Related
- 2002-04-03 BR BR0208415-5A patent/BR0208415A/pt active Search and Examination
- 2002-04-03 CZ CZ20032736A patent/CZ299651B6/cs not_active IP Right Cessation
- 2002-04-03 HU HU0303757A patent/HUP0303757A2/hu unknown
- 2002-04-03 JP JP2002579971A patent/JP4116445B2/ja not_active Expired - Fee Related
- 2002-04-03 SK SK1192-2003A patent/SK286828B6/sk not_active IP Right Cessation
- 2002-04-03 US US10/469,770 patent/US20040116306A1/en not_active Abandoned
- 2002-04-03 AR ARP020101223A patent/AR033453A1/es active IP Right Grant
-
2003
- 2003-10-08 NO NO20034495A patent/NO325635B1/no not_active IP Right Cessation
- 2003-11-07 ZA ZA200308690A patent/ZA200308690B/en unknown
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
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US5681506A (en) * | 1992-10-30 | 1997-10-28 | Castrol Limited | Corrosion inhibiting lubricant composition |
US6074992A (en) * | 1999-02-02 | 2000-06-13 | Union Carbide Chemicals & Plastics Technology Corporation | Functional fluid compositions |
US6984340B1 (en) * | 1999-10-14 | 2006-01-10 | Brad-Chem Technology Limtied | Corrosion inhibiting formulations |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20070093395A1 (en) * | 2005-10-21 | 2007-04-26 | Habeeb Jacob J | Antiwear inhibiting and load enhancing additive combinations for lubricating oils |
US20070171569A1 (en) * | 2006-01-23 | 2007-07-26 | Burns John M | System and method for reducing corrosion in a fluid dynamic bearing |
US7535673B2 (en) | 2006-01-23 | 2009-05-19 | Hitachi Global Storage Technologies Netherlands B.V. | Fluid dynamic bearing comprising a lubricating fluid having tolutriazole |
CN107557121A (zh) * | 2017-08-15 | 2018-01-09 | 杭州天汇精细化工有限公司 | 一种汽车制动液及其生产方法 |
Also Published As
Publication number | Publication date |
---|---|
CN1501971A (zh) | 2004-06-02 |
WO2002081604A1 (de) | 2002-10-17 |
JP4116445B2 (ja) | 2008-07-09 |
CA2442697A1 (en) | 2002-10-17 |
ES2235077T3 (es) | 2005-07-01 |
ATE286112T1 (de) | 2005-01-15 |
JP2004523641A (ja) | 2004-08-05 |
DE50201902D1 (de) | 2005-02-03 |
PL197796B1 (pl) | 2008-04-30 |
SK286828B6 (sk) | 2009-06-05 |
KR100861969B1 (ko) | 2008-10-08 |
KR20030087063A (ko) | 2003-11-12 |
NO325635B1 (no) | 2008-06-30 |
AU2002308121B2 (en) | 2007-08-09 |
CZ20032736A3 (cs) | 2003-12-17 |
NO20034495D0 (no) | 2003-10-08 |
PT1379615E (pt) | 2005-04-29 |
ZA200308690B (en) | 2004-11-08 |
AR033453A1 (es) | 2003-12-17 |
EP1379615B1 (de) | 2004-12-29 |
CZ299651B6 (cs) | 2008-10-01 |
SK11922003A3 (sk) | 2004-02-03 |
EP1379615A1 (de) | 2004-01-14 |
CA2442697C (en) | 2011-03-15 |
MXPA03007944A (es) | 2004-04-02 |
CN1312261C (zh) | 2007-04-25 |
HUP0303757A2 (hu) | 2004-03-01 |
NO20034495L (no) | 2003-10-08 |
BR0208415A (pt) | 2004-03-30 |
PL367159A1 (en) | 2005-02-21 |
DE10117647A1 (de) | 2002-10-17 |
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