EP0011730B2 - Brake fluids having a conserving activity and an amount of oleic acid - Google Patents

Brake fluids having a conserving activity and an amount of oleic acid Download PDF

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Publication number
EP0011730B2
EP0011730B2 EP79104326A EP79104326A EP0011730B2 EP 0011730 B2 EP0011730 B2 EP 0011730B2 EP 79104326 A EP79104326 A EP 79104326A EP 79104326 A EP79104326 A EP 79104326A EP 0011730 B2 EP0011730 B2 EP 0011730B2
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EP
European Patent Office
Prior art keywords
brake
weight
formula
oleic acid
brake fluids
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP79104326A
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German (de)
French (fr)
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EP0011730A1 (en
EP0011730B1 (en
Inventor
Gert Dr. Dipl.-Chem. Liebold
Klaus Dr. Dipl.-Chem. Barthold
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BASF SE
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BASF SE
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Publication of EP0011730B1 publication Critical patent/EP0011730B1/en
Publication of EP0011730B2 publication Critical patent/EP0011730B2/en
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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
    • C10M107/00—Lubricating compositions characterised by the base-material being a macromolecular compound
    • C10M107/20—Lubricating compositions characterised by the base-material being a macromolecular compound containing oxygen
    • C10M107/30—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M107/32—Condensation polymers of aldehydes or ketones; Polyesters; Polyethers
    • C10M107/34—Polyoxyalkylenes
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    • C10M105/00—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound
    • C10M105/78—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound containing boron
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    • C10M129/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen
    • C10M129/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen having a carbon chain of less than 30 atoms
    • C10M129/26—Carboxylic acids; Salts thereof
    • C10M129/28—Carboxylic acids; Salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
    • C10M129/38—Carboxylic acids; Salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having 8 or more carbon atoms
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    • 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
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    • 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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    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/10—Carboxylix acids; Neutral salts thereof
    • C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
    • C10M2207/125—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids
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    • C10M2207/128—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids containing hydroxy groups; Ethers thereof
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    • C10N2020/00—Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
    • C10N2020/01—Physico-chemical properties
    • 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

  • Brake fluids with a preservative effect containing oleic acid Brake fluids with a preservative effect containing oleic acid.
  • the invention relates to brake fluids based on polyglycol ethers and polyglycols containing fatty acids.
  • DOT-3 brake fluids generally have good corrosion protection against tinplate, steel, cast iron, brass, copper and aluminum. Corrosion protection is only guaranteed if the metals are completely immersed in the liquid or otherwise well wetted by it.
  • a major disadvantage of this brake pastes is that they greatly increase in re-filling of the brake system with brake fluid, the viscosity, so that the viscosity of the filled fluid under circumstances, the maximum viscosities of 1,500.10- 3 m 2 / s at -40 ° C substantially exceeds. Such mixtures then no longer meet the requirements of FMVSS 116, DOT3.
  • Brake fluids containing corrosion-inhibiting oleic acid based on polyglycol ethers and polyglycols are already known from British patent specification 1,081,294.
  • di- or trialkylene glycols should be used according to the teaching of the patent mentioned.
  • these brake fluids provide insufficient rust protection in moisture corrosion tests compared to the brake fluids of the invention.
  • a brake fluid consisting of a) 20% by weight polypropylene glycol with an average molecular weight of 2000; b) an alkenyl dicarboxylic acid anhydride; c) 78.2% by weight of a commercial, technical polyglycol ether mixture and d) antioxidants were available to the public prior to the priority date of the present patent.
  • the task was therefore to propose brake fluids that can be used for impregnation at the same time and that allow the components to be stored for longer periods without corrosion.
  • the high molecular weight polyalkylene glycols are carrier substances that have low water solubility and are characterized by high lipophilicity. This allows them to dissolve the oleic acid more, so that the concentration of oleic acid in the brake fluid can be up to 3%.
  • Polyalkylene glycols of the formula I contained therein can consist solely of polypropylene glycols or can be prepared by mixing predominantly polypropylene glycols with polyethylene glycols or by reacting mixtures of ethylene oxide and (in excess) propylene oxide, statistical mixtures of compounds being formed which on average contain more propylene oxide than ethylene oxide residues and have molecular weights in the specified range.
  • polyethylene glycols can also be reacted with propylene oxide or polypropylene glycols with ethylene oxide, the starting polyglycols the amount of alkylene oxides and the polymerization conditions being chosen so that polyalkylene glycols according to the formula with the molecular weights specified there of 500 to 3000, preferably 1800 to 2200, are formed.
  • the procedure is expediently such that an epoxy mixture consisting of the desired molar ratios of ethylene oxide and propylene oxide is polymerized by methods known per se.
  • Oleic acid is used as corrosion inhibitor.
  • the basic components are the polyglycol ethers of the formula 11 which are customary in brake fluids, for example
  • the brake fluids according to the invention can also contain boric acid esters of glycol ethers of the formula 11, e.g. in amounts of 20 to 50% by weight.
  • Suitable boric acid esters are e.g. Methyl-tri-glycol-ortho-bora, ethyl-tri-glycol-ortho-borate, methyl / ethyl-di / tri-ortho-borate.
  • cast iron wheel brake cylinders are halved on the long side, cleaned with isopropanol and dried well.
  • the halved brake cylinder is then immersed in the brake fluid for 5 seconds each, drained for 5 seconds and stored in a closed container over a water vapor-saturated atmosphere.

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  • 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)

Description

Bremsflüssigkeiten mit konservierender Wirkung mit einem Gehalt an Ölsäure.Brake fluids with a preservative effect containing oleic acid.

Die Erfindung betrifft Bremsflüssigkeiten auf der Basis von Polyglykolethern und Polyglykolen mit einem Gehalt an Fettsäuren.The invention relates to brake fluids based on polyglycol ethers and polyglycols containing fatty acids.

Handelsüblichen Bremsflüssigkeiten, die den US-Normen des Federal Motor Vehicle Safety Standard FMVSS 115, DOT 3 bzw. des Handbook of the Society of Automotive Engineers SAE J 1703 entsprechen, bestehen im wesentlichen aus Glykolethern als Basiskomponenten, Polyglykolen als Schmiermittelkomponenten und enthalten Inhibitoren zwecks Korrosionsschutz und Antioxidationsmittel.Commercial brake fluids that comply with the US standards of the Federal Motor Vehicle Safety Standard FMVSS 115, DOT 3 and the Handbook of the Society of Automotive Engineers SAE J 1703 consist essentially of glycol ethers as basic components, polyglycols as lubricant components and contain inhibitors for corrosion protection and antioxidants.

Diese DOT-3-Bremsflüssigkeiten weisen im allgemeinen guten Korrosionsschutz gegenüber Weissblech, Stahl, Grauguss, Messing, Kupfer und Aluminium auf. Der Korrosionsschutz ist jedoch nur dann gewährleistet, wenn die Metalle vollständig in die Flüssigkeit eingetaucht werden oder sonst von ihr gut benetzt werden.These DOT-3 brake fluids generally have good corrosion protection against tinplate, steel, cast iron, brass, copper and aluminum. Corrosion protection is only guaranteed if the metals are completely immersed in the liquid or otherwise well wetted by it.

Um Bremsteile, insbesondere Radbremszylinder aus Grauguss, nach der Herstellung und Funktionsprüfung rostfrei lagern zu können, ist die Imprägnierung mit speziellen Bremspasten üblich.In order to be able to store brake parts, in particular cast iron wheel brake cylinders, after manufacture and functional test, they are impregnated with special brake pastes.

Ein wesentlicher Nachteil dieser Bremspasten besteht darin, dass sie bei Wiederbefüllung des Bremssystems mit Bremsflüssigkeit die Viskosität erheblich erhöhen, so dass die Viskosität der eingefüllten Bremsflüssigkeit unter Umständen die maximalen Viskositäten von 1,500.10-3 m2/s bei -40°C wesentlich übersteigt. Derartige Mischungen erfüllen dann nicht mehr die Anforderungen der FMVSS 116, DOT3.A major disadvantage of this brake pastes is that they greatly increase in re-filling of the brake system with brake fluid, the viscosity, so that the viscosity of the filled fluid under circumstances, the maximum viscosities of 1,500.10- 3 m 2 / s at -40 ° C substantially exceeds. Such mixtures then no longer meet the requirements of FMVSS 116, DOT3.

Aus der britischen Patentschrift 1 081 294 sind schon korrosionsinhibierende Ölsäure enthaltende Bremsflüssigkeiten auf der Basis von Polyglykolethern und Polyglykolen bekannt. Im Gegensatz zu den vorliegenden Bremsflüssigkeiten, die 10 und mehr Alkylenoxideinheiten im Polyalkylenglykol enthalten, sollen gemäss der Lehre der genannten Patentschrift Di- oder Trialkylenglykole verwendet werden. Diese Bremsflüssigkeiten geben jedoch im Vergleich mit den Bremsflüssigkeiten der Erfindung einen unzureichenden Rostschutz in Feuchtigkeitskorrosionstests.Brake fluids containing corrosion-inhibiting oleic acid based on polyglycol ethers and polyglycols are already known from British patent specification 1,081,294. In contrast to the present brake fluids, which contain 10 and more alkylene oxide units in the polyalkylene glycol, di- or trialkylene glycols should be used according to the teaching of the patent mentioned. However, these brake fluids provide insufficient rust protection in moisture corrosion tests compared to the brake fluids of the invention.

Eine Bremsflüssigkeit bestehend aus a) 20 Gew.% Polypropylenglykol mit einem durchschnittlichen Molekulargewicht von 2000; b) einem Alkenyldicarbonsäureanhydrid; c) 78,2 Gew.% eines handelsüblichen, technischen Polyglykolethergemisches und d) Antioxidantien war der Öffentlichkeit vor dem Prioritätstag vorliegenden Patents zugänglich.A brake fluid consisting of a) 20% by weight polypropylene glycol with an average molecular weight of 2000; b) an alkenyl dicarboxylic acid anhydride; c) 78.2% by weight of a commercial, technical polyglycol ether mixture and d) antioxidants were available to the public prior to the priority date of the present patent.

Es bestand daher die Aufgabe, Bremsflüssigkeiten vorzuschlagen, die gleichzeitig zur Imprägnierung verwendet werden können und die die Lagerung der Bauteile über längere Perioden ohne Korrosion ermöglichen.The task was therefore to propose brake fluids that can be used for impregnation at the same time and that allow the components to be stored for longer periods without corrosion.

Allein die Erhöhung der Inhibitorkonzentration bzw. die Verwendung anderer Inhibitoren, z.B. von Fettsäuren kann zwar die korrosionsschützende Wirkung auf den benetzten Teil erhöhen. Man erhält aber nicht Flüssigkeiten die den Anforderungen, die an Bremsschutzflüssigkeiten gestellt werden, entsprechen. Ausserdem kann man die Konzentration der Fettsäuren oder Fettsäurederivate nur geringfügig steigern, weil diese Komponenten bei tiefer Temperatur zur Ausfällung neigen bzw. erhöhte Gummiquellung der SBR-Manschetten verursachen.Simply increasing the inhibitor concentration or using other inhibitors, e.g. of fatty acids can increase the anti-corrosion effect on the wetted part. However, fluids are not obtained that meet the requirements placed on brake protection fluids. In addition, the concentration of fatty acids or fatty acid derivatives can only be increased slightly because these components tend to precipitate at low temperatures or cause increased rubber swelling of the SBR cuffs.

Es wurde nun überraschenderweise gefunden, dass Bremsflüssigkeiten auf der Grundlage von Polyglykolethern als Basiskomponenten, Polyglykolen als Schmiermittelkomponenten mit einem Gehalt an Ölsäure als Korrosionsinhibitor gegebenenfalls weiteren Inhibitoren und Antioxydationsmittel der genannten Forderung genügen, wenn sie einen Gehalt von

  • A) 10 bis 40 Gew.%, bezogen auf die Bremsflüssigkeit, Polyalkylenglykole in Form von einheitlichen Verbindungen oder Gemischen der Formel 1
    Figure imgb0001
    in der R einen 1,2-Ethylen- und/oder 1,2-Propylenrest bedeutet, wobei, bezogen auf die einzelne Verbindung oder das Gemisch, die Zahl der Propylenreste überwiegt und n für eine Zahl von 10 oder mehr steht, und wobei ferner das durchschnittliche Molekulargewicht 500 bis 3000 beträgt,
  • B) 0,1 bis 3 Gew.% Ölsäure, sowie als Ergänzung zu 100% die folgenden Bestandteile,
  • C) Polyglykolether der Formel
    Figure imgb0002
    in der R1 Methyl oder Ethyl, R2 Wasserstoff oder Methyl und n die Zahlen 2 bis 4 bedeuten,
  • D) gegebenenfalls Polyglykol des Ethylenoxids und/oder Propylenoxids mit einem Molekulargewicht im Molekulargewichtsbereich üblicher Schmiermittel in Bremsflüssigkeiten, und/oder
  • E) gegebenenfalls 20 bis 50 Gew.% von Borsäureestern von Glykolethern der Formel 11 und
  • F) geringe Mengen an sich bekannter Antioxydantien und Inhibitoren ausgewählt aus der Gruppe bestehend aus Benzotriazol, Imidazol, Imidazolin, prim., sek. Amine, Ethanolamine, Bisphenol A, Triphenylphosphit oder 2,4-Di-tert.-butyl-kresol
It has now surprisingly been found that brake fluids based on polyglycol ethers as basic components, polyglycols as lubricant components with a content of oleic acid as a corrosion inhibitor, possibly further inhibitors and antioxidants meet the stated requirement if they have a content of
  • A) 10 to 40% by weight, based on the brake fluid, polyalkylene glycols in the form of uniform compounds or mixtures of the formula 1
    Figure imgb0001
     in which R represents a 1,2-ethylene and / or 1,2-propylene radical, where, based on the individual compound or the mixture, the number of propylene radicals predominates and n stands for a number of 10 or more, and furthermore the average molecular weight is 500 to 3000,
  • B) 0.1 to 3% by weight of oleic acid, and as a supplement to 100% the following constituents,
  • C) Polyglycol ethers of the formula
    Figure imgb0002
     in which R 1 is methyl or ethyl, R 2 is hydrogen or methyl and n is the numbers 2 to 4,
  • D) optionally polyglycol of ethylene oxide and / or propylene oxide with a molecular weight in the molecular weight range of conventional lubricants in brake fluids, and / or
  • E) optionally 20 to 50% by weight of boric acid esters of glycol ethers of the formula 11 and
  • F) small amounts of known antioxidants and inhibitors selected from the group consisting of benzotriazole, imidazole, imidazoline, prim., Sec. Amines, ethanolamines, bisphenol A, triphenyl phosphite or 2,4-di-tert-butyl-cresol

aufweisen.exhibit.

Die hochmolekularen Polyalkylenglykole sind dabei Trägersubstanzen, die geringe Wasserlöslichkeit aufweisen und durch hohe Lipophilität gekennzeichnet sind. Dadurch können sie die Ölsäure vermehrt lösen, so dass die Konzentration der Ölsäure bis zu 3% in der Bremsflüssigkeit betragen kann.The high molecular weight polyalkylene glycols are carrier substances that have low water solubility and are characterized by high lipophilicity. This allows them to dissolve the oleic acid more, so that the concentration of oleic acid in the brake fluid can be up to 3%.

Die erfindungsgemäss in den Bremsflüssigkeiten enthaltenen Polyalkylenglykole der Formel I können allein aus Polypropylenglykolen bestehen oder durch Mischen von vorwiegend Polypropylenglykolen mit Polyethylenglykolen oder durch Umsetzen von Gemischen von Ethylenoxid und (in Überschuss) Propylenoxid hergestellt werden, wobei statistische Gemische von Verbindungen entstehen, die im Mittel mehr Propylenoxid als Ethylenoxidreste enthalten und Molekulargewichte in dem angegebenen Bereich aufweisen.According to the invention in the brake fluid Polyalkylene glycols of the formula I contained therein can consist solely of polypropylene glycols or can be prepared by mixing predominantly polypropylene glycols with polyethylene glycols or by reacting mixtures of ethylene oxide and (in excess) propylene oxide, statistical mixtures of compounds being formed which on average contain more propylene oxide than ethylene oxide residues and have molecular weights in the specified range.

Man kann aber auch Polyethylenglykole mit Propylenoxid oder Polypropylenglykole mit Ethylenoxid umsetzen, wobei die Ausgangspolyglykole die Menge der Alkylenoxide und die Polymerisationsbedingungen so gewählt werden, dass Polyalkylenglykole gemäss Formel mit den dort spezifizierten Molgewichten von 500 bis 3000, vorzugsweise 1800 bis 2200, entstehen.However, polyethylene glycols can also be reacted with propylene oxide or polypropylene glycols with ethylene oxide, the starting polyglycols the amount of alkylene oxides and the polymerization conditions being chosen so that polyalkylene glycols according to the formula with the molecular weights specified there of 500 to 3000, preferably 1800 to 2200, are formed.

Zweckmässig geht man zur Herstellung der Polyalkylenglykole der Formel im einzelnen so vor, dass ein Epoxid-Gemisch, bestehend aus den jeweils gewünschten Molverhältnissen Ethylenoxid und Propylenoxid nach an sich bekannten Methoden polymerisiert wird.In order to produce the polyalkylene glycols of the formula, the procedure is expediently such that an epoxy mixture consisting of the desired molar ratios of ethylene oxide and propylene oxide is polymerized by methods known per se.

Als Korrosionsinhibitoren wird Ölsäure verwendet.Oleic acid is used as corrosion inhibitor.

Als Basiskomponenten kommen die in Bremsflüssigkeiten üblichen Polyglykolether der Formel 11, z.B.

Figure imgb0003
The basic components are the polyglycol ethers of the formula 11 which are customary in brake fluids, for example
Figure imgb0003

Als weitere Inhibitoren und Antioxydationsmittel kommen die ebenfalls an sich bekannten Verbindungen:

  • Benzotriazol, Imidazol, Imidazolin, prim., sek. Amine, Ethanolamine, Bisphenol A, Triphenylphosphit oder 2,4-Di-tert.-butyl-kresol in Betracht.
The compounds known per se also come as further inhibitors and antioxidants:
  • Benzotriazole, imidazole, imidazoline, prim., Sec. Amines, ethanolamines, bisphenol A, triphenyl phosphite or 2,4-di-tert-butyl-cresol.

Die erfindungsgemässen Bremsflüssigkeiten können auch Borsäureester von Glykolethern der Formel 11 enthalten, z.B. in Mengen von 20 bis 50 Gew.%. Geeignete Borsäureester sind z.B. Methyl-tri-glykol-ortho-bora, Ethyl-tri-glykol-ortho-borat, Methyl-/Ethyl-di/tri-ortho-borat.The brake fluids according to the invention can also contain boric acid esters of glycol ethers of the formula 11, e.g. in amounts of 20 to 50% by weight. Suitable boric acid esters are e.g. Methyl-tri-glycol-ortho-bora, ethyl-tri-glycol-ortho-borate, methyl / ethyl-di / tri-ortho-borate.

Weitere Boresterverbindungen sind in der USA-3 711 410 im einzelnen beschrieben.Further borester compounds are described in detail in US Pat. No. 3,711,410.

Zur Untersuchung der Wirkung der erfindungsgemässen Bremsflüssigkeiten werden Radbremszylinder aus Grauguss längsseitig halbiert, mit Isopropanol gereinigt und gut getrocknet. Man taucht dann den halbierten Bremszylinder jeweils 5 Sekunden in die Bremsflüssigkeit ein, lässt 5 Sekunden abtropfen und lagert sie in einem geschlossenen Gefäss über einer wasserdampfgesättigten Atmosphäre.

Figure imgb0004
To study the effect of the brake fluids according to the invention, cast iron wheel brake cylinders are halved on the long side, cleaned with isopropanol and dried well. The halved brake cylinder is then immersed in the brake fluid for 5 seconds each, drained for 5 seconds and stored in a closed container over a water vapor-saturated atmosphere.
Figure imgb0004

Zum Vergleich mit üblichen Bremsflüssigkeiten wurden folgende Versuche durchgeführt:

  • 1. Feuchtigkeitskorrosionstest mit der SAE RM 1 Reference-Fluid: Bereits nach wenigen Tagen war starke Korrosion der Graugussbremszylinder festzustellen.
  • 2. Verwendung einer handelsüblichen Bremsflüssigkeit gemäss DOT 3 der folgenden Zusammensetzung: 20% Polyglykol, Mol-Verh. EO/PO 2:4 (EO = Ethylenoxid, PO = Propylenoxid), Mol-Gew. 300, 20% Triethylenglykol, 5% Butyltriglykol, 25% Ethyltriglykol, 29,4% Ethyldiglykol, 0,25% Dibutylamin, 0,30% Bisphenol A, 0,05% Benzotriazol. Nach wenigen Stunden bis zwei Tagen war starker Rostansatz auf den Graugussteilen zu beobachten.
  • 3. Verwendung von einer Bremsflüssigkeit, bestehend aus ca. 70 Gewichtsteilen Glykolether, 25% eines handelsüblichen Schmiermittels auf EO/PO-Basis (Molverhältnis 2:1, Molgewicht 1100), 3% einer Mischung von Korrosionsinhibitoren aus Benzotriazol, Dodecylamin, Triethanolamin und 2% Ölsäure. (Die Ölsäure scheidet sich beim Abkühlen teilweise aus; es tritt eine Trübung ein.) Nach ca. 8 Stunden konnte Rostansatz beobachtet werden.
  • 4. Es wurde die gleiche Mischung wie unter 3, angegeben verwendet, nur wurden anstelle der 25% Schmiermittel nur 15% Schmiermittel verwendet und 10% eines PO-Adduktes in Kombination mit einem PO/EO-Addukt (Zusammensetzung 90% PO/10% EO, mittlerer MG 2000). Im Korrosionsversuch zeigte sich nach 30 Tagen keinerlei Rostansatz.
  • 5. 25% Polypropylenglykol mit Molgewicht 900, 20% Ethyltriglykol, 30% Ethyldiglykol, 2% Ölsäure, 1,5% Dibutylamin, 4% eines Glycerin-Borsäureadduktes, 0,05% Benzotriazol und 17,45% Methyltriglykol. Die Viskosität bei -40°C betrug 1,276.10-3 m2/s, der Kochpunkt 215°C, pH-Wert 9,3. Die Flüssigkeit entspricht SAE J 1703. Im Feuchtigkeitskorrosionstest nach 30 Tagen kein Rostansatz.
The following tests were carried out for comparison with conventional brake fluids:
  • 1. Moisture corrosion test with the SAE RM 1 Reference-Fluid: After just a few days, the cast iron brake cylinder showed severe corrosion.
  • 2. Use of a commercially available brake fluid according to DOT 3 of the following composition: 20% polyglycol, mole ratio. EO / PO 2: 4 (EO = ethylene oxide, PO = propylene oxide), mol. 300, 20% triethylene glycol, 5% butyl triglycol, 25% ethyl triglycol, 29.4% ethyl diglycol, 0.25% dibutylamine, 0.30% bisphenol A, 0.05% benzotriazole. After a few hours to two days, heavy rust formation was observed on the gray cast iron parts.
  • 3.Use of a brake fluid consisting of approx. 70 parts by weight of glycol ether, 25% of a commercially available lubricant based on EO / PO (molar ratio 2: 1, molecular weight 1100), 3% of a mixture of corrosion inhibitors made of benzotriazole, dodecylamine, triethanolamine and 2 % Oleic acid. (The oleic acid is partially eliminated on cooling; it becomes cloudy.) After about 8 hours, rust formation could be observed.
  • 4. The same mixture as given under 3 was used, only instead of the 25% lubricant only 15% lubricant was used and 10% of a PO adduct in combination with a PO / EO adduct (composition 90% PO / 10% EO, medium MG 2000). In the corrosion test, there was no rust formation after 30 days.
  • 5. 25% polypropylene glycol with a molecular weight of 900, 20% ethyl triglycol, 30% ethyl diglycol, 2% oleic acid, 1.5% dibutylamine, 4% of a glycerol-boric acid adduct, 0.05% benzotriazole and 17.45% methyl triglycol. The viscosity at -40 ° C was 1,276.10- 3 m 2 / s, the boiling point of 215 ° C, pH 9.3. The liquid corresponds to SAE J 1703. No rust formation after 30 days in the moisture corrosion test.

Claims (1)

  1. Brake fluids based on polyglycol ethers and polyglycols and containing fatty acids, characterized in that they contain
    A) 10 to 40% by weight, based on the brake fluid, of polyalkylene glycols, in the form of uniform compounds or mixtures of compounds, of the formula I
    Figure imgb0007
    where R is a 1,2-ethylene and/or 1,2-propylene radical, the number of propylene radicals, based on the individual compound or the mixture, predominating, and n being a number of 10 or more, and the average molecular weight being 500 to 3000,
    B) 0.1 to 3% by weight of oleic acid, and, to make up 100%, the following constituents:
    C) polyglycol ethers of the formula
    Figure imgb0008
    where R1 is methyl or ethyl, R2 is hydrogen or methyl, and n is a number from 2 to 4,
    D) if desired, polyglycols of ethylene oxide and/or propylene oxide having a molecular weight in the molecular weight range of lubricants usually used in brake fluids, and/or
    E) if desired, 20 to 50% by weight of boric acid esters of glycol ethers of the formula II, and
    F) small amounts of conventional antioxidants and inhibitors selected from the group consisting of benzotriazole, imidazole, imidazoline, primary and secondary amines, ethanolamines, bisphenol A, triphenyl phosphite and 2,4-di-tert.-butyl cresol.
EP79104326A 1978-11-25 1979-11-06 Brake fluids having a conserving activity and an amount of oleic acid Expired EP0011730B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2851057 1978-11-25
DE19782851057 DE2851057A1 (en) 1978-11-25 1978-11-25 BRAKE FLUIDS WITH PRESERVATIVE EFFECT

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EP0011730A1 EP0011730A1 (en) 1980-06-11
EP0011730B1 EP0011730B1 (en) 1982-10-06
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IT1227061B (en) * 1988-09-13 1991-03-14 Lubritalia Spa SAFETY HYDRODYNAMIC FLUIDS RESISTANT TO FLAME PROPAGATION AND WITH HIGH SELF-IGNITION TEMPERATURE AND PROCEDURE FOR THEIR PREPARATION.
US6855676B2 (en) 2002-02-11 2005-02-15 Ecolab., Inc. Lubricant for conveyor system
WO2010053641A1 (en) * 2008-11-07 2010-05-14 Dow Global Technologies Inc. Low viscosity functional fluids

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US2434978A (en) * 1944-04-15 1948-01-27 William A Zisman Anticorrosion additives for synthetic lubricants
NL302392A (en) * 1962-12-28
GB1388012A (en) * 1972-02-09 1975-03-19 Shell Int Research Hydraulic fluids and their preparation

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