EP0011730B1 - Bremsflüssigkeiten mit konservierender Wirkung mit einem Gehalt an Ölsäure - Google Patents
Bremsflüssigkeiten mit konservierender Wirkung mit einem Gehalt an Ölsäure Download PDFInfo
- Publication number
- EP0011730B1 EP0011730B1 EP79104326A EP79104326A EP0011730B1 EP 0011730 B1 EP0011730 B1 EP 0011730B1 EP 79104326 A EP79104326 A EP 79104326A EP 79104326 A EP79104326 A EP 79104326A EP 0011730 B1 EP0011730 B1 EP 0011730B1
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- EP
- European Patent Office
- Prior art keywords
- brake
- brake fluids
- molecular weight
- formula
- weight
- 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.)
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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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- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- 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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- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- 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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- 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
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- 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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- 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
- C10M2207/10—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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- C10M2207/10—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
- 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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- C10M2207/10—Carboxylix acids; Neutral salts thereof
- C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
- C10M2207/129—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of thirty or more carbon atoms
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- C10M2209/10—Macromolecular compoundss obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C10M2209/103—Polyethers, i.e. containing di- or higher polyoxyalkylene groups
- C10M2209/1033—Polyethers, i.e. containing di- or higher polyoxyalkylene groups used as base material
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- C10M2209/103—Polyethers, i.e. containing di- or higher polyoxyalkylene groups
- C10M2209/104—Polyethers, i.e. containing di- or higher polyoxyalkylene groups of alkylene oxides containing two carbon atoms only
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- C10M2209/104—Polyethers, i.e. containing di- or higher polyoxyalkylene groups of alkylene oxides containing two carbon atoms only
- C10M2209/1045—Polyethers, i.e. containing di- or higher polyoxyalkylene groups of alkylene oxides containing two carbon atoms only used as base material
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- C10M2209/10—Macromolecular compoundss obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C10M2209/103—Polyethers, i.e. containing di- or higher polyoxyalkylene groups
- C10M2209/105—Polyethers, i.e. containing di- or higher polyoxyalkylene groups of alkylene oxides containing three carbon atoms only
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- C10M2209/105—Polyethers, i.e. containing di- or higher polyoxyalkylene groups of alkylene oxides containing three carbon atoms only
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- C10M2209/103—Polyethers, i.e. containing di- or higher polyoxyalkylene groups
- C10M2209/106—Polyethers, i.e. containing di- or higher polyoxyalkylene groups of alkylene oxides containing four carbon atoms only
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- C10M2209/103—Polyethers, i.e. containing di- or higher polyoxyalkylene groups
- C10M2209/107—Polyethers, i.e. containing di- or higher polyoxyalkylene groups of two or more specified different alkylene oxides covered by groups C10M2209/104 - C10M2209/106
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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
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- C10N2040/00—Specified use or application for which the lubricating composition is intended
- C10N2040/08—Hydraulic fluids, e.g. brake-fluids
Definitions
- the invention relates to brake fluids containing em 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 - exceed 10- 3 m z / s at -40 ° C substantially . Such mixtures then no longer meet the requirements of FMVSS 116, DOT3.
- the task was therefore to propose brake fluids that can be used simultaneously for impregnation 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. As a result, they can dissolve the fatty acids more, so that the concentration of the fatty acids can be up to 3% in the brake fluid.
- the polyalkylene glycols of the formula I contained in the brake fluids according to the invention can consist solely of polypropylene glycols, by mixing predominantly polypropylene glycols with polyethylene glycols or by reacting mixtures of ethylene oxide and (in excess) propylene oxide are produced, statistical mixtures of compounds being formed which on average contain more propylene oxide than ethylene oxide residues and have molecular weights in the range specified.
- 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 selected, consisting of polyalkylene glycols according to the formula with the molecular weights specified there from 500 to 3000, preferably 1800 to 2200.
- the procedure for the preparation of the polyalkylene glycols of the formula is such that an epoxy mixture consisting of the desired molar ratios of ethylene oxide and propylene oxide is polymerized by methods known per se.
- Fatty acids to be added as corrosion inhibitors are in particular C 12 to C 24 monocarboxylic acids or their derivatives.
- fatty acids with and without olefinic double bonds come into consideration.
- Suitable fatty acids are e.g. As oleic acid, ricinoleic acid, stearic acid, linoleic acid or linolenic acid.
- the basic components are the polyglycol ethers of formula II that are common in brake fluids into consideration, in which R 1 is a low molecular weight alkyl radical, preferably methyl, R 2 is hydrogen or methyl and n is the numbers 2 to 4.
- R 1 is a low molecular weight alkyl radical, preferably methyl
- R 2 is hydrogen or methyl
- n is the numbers 2 to 4.
- the brake fluids according to the invention can also contain boric acid esters of glycol ethers of the formula II, for. B. in amounts of 20 to 50 wt .-%.
- Suitable boric acid esters are e.g. B. methyl tri glycol ortho borate, ethyl tri glycol ortho borate, methyl / ethyl di / tri ortho borate.
- wheel brake cylinders made of gray cast iron are halved on the long side, cleaned with isopropanol ... and well dried.
- the halved brake cylinder is then immersed for 5 seconds each in the commercially available brake fluid or in the brake fluids.
- improved corrosion protection drains for 5 seconds and stores them in a closed container over a water vapor-saturated atmosphere.
- the build-up of rust is avoided, even after storage for 30 days above the water vapor-saturated atmosphere at room temperature.
- Brake fluids containing corrosion-inhibiting fatty acids 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 give insufficient rust protection in moisture corrosion tests compared to the brake fluids of the invention.
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- Chemical & Material Sciences (AREA)
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- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
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- Emergency Medicine (AREA)
- Lubricants (AREA)
Description
- Die Erfindung betrifft Bremsflüssigkeiten mit emem Gehalt an Fettsäuren.
- Handelsüblichen Bremsflüssigkeiten, die den US-Normen des Federal Motor Vehicle Safety Standard FMVSS 116, DOT 3 bzw. des Handbook of the Society of Automotive Engineers SAE J 1703 entsprechen, bestehen im wesentlichen aus Glykoläthern als Basiskomponenten, Polyglykolen als Schmiermittelkomponenten und enthalten Inhibitoren zwecks Korrosionsschutz und Antioxidationsmittel.
- 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.
- Um Bremsteile, insbesondere Radbremszylirder aus Grauguß, nach der Herstellung und Funktionsprüfung rostfrei lagern zu können, ist die Imprägnierung mit speziellen Bremspasten üblich.
- 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 mz/s bei -40°C wesentlich übersteigt. Derartige Mischungen erfüllen dann nicht mehr die Anforderungen der FMVSS 116, DOT3.
- 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.
- 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 Bremsenschutzflüssigkeiten 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.
- Es wurde nun überraschenderweise gefunden, daß Bremsfiüssigkeiten auf der Grundlage von Polyglykoläthern als Basiskomponenten, Polyglykolen als Schmiermittelkomponenten mit einem Gehalt einer Fettsäure als Korrosionsinhibitor gegebenenfails weiteren Inhibitoren und Antioxydationsmittel der genannten Forderung genügen, wenn sie einen Gehalt von
- A) 10 bis 40 Gew.-%, bezogen auf die Bremsflüssigkeit von Polyalkylenglykoien in Form von einheitlichen Verbindungen oder Gemischen von Verbindungen dar Formel
- B) 0,1 bis 3 Gew.-% einer an sich als Korrosionsinhibitor bekannten Fettsäure, sowie als Ergänzung zu 100% die folgenden Bestandteile,
- C) Polyglykoläther der Formel
- D) ggf. Polyglykole des Äthylenoxids und/oder Propylenoxids mit einem Molekulargewicht im Molekulargewichtsbereich üblicher Schmiermittel in Bremsflüssigkeiten, und/oder
- E) ggf. 20 bis 50 Gew.-% von Borsäureestern von Glykoiäthern der Formel 11 und
- F) geringe Mengen an sich bekannter Antioxydantien und Inhibitoren
- Die hochmolekularen Polyalkylenglykole sind dabei Trägersubstanzen, die geringe Wasserlöslichkeit aufweisen und durch hohe Lipophilität gekennzeichnet sind. Dadurch können sie die Fettsäuren vermehrt lösen, so daß die Konzentration der Fettsäuren bis zu 3% in der Bremsflüssigkeit betragen kann.
- Die erfindungsgemäß in den Bremsflüssigkeiten enthaltenen Polyalkylenglykole der Formel I können durch allein aus Polypropylenglykolen bestehen, durch Mischen von vorwiegend Polypropylenglykolen mit Polyäthylenglykolen oder durch Umsetzen von Gemischen von Äthylenoxid und (in Überschuß) Propylenoxid hergestellt werden, wobei statistische Gemische von Verbindungen entstehen, die im Mittel mehr Propylenoxid als Äthylenoxidreste enthalten und Molekulargewichte in dem angegebenen Bereich aufweisen.
- Man kann aber auch Polyäthylenglykole mit Propylenoxid oder Polypropylenglykole mit Äthylenoxid umsetzen, wobei die Ausgangspolyglykole die Menge der Alkylenoxide und die Polymerisationsbedingungen so gewählt werden, bestehend Polyalkylenglykole gemäß Formel mit den dort spezifizierten Molgewichten von 500 bis 3000, vorzugsweise 1800 bis 2200, entstehen.
- Zweckmäßig geht man zur Herstellung der Polyalkylenglykole der Formel im einzelnen so vor, daß ein Epoxid-Gemisch, bestehend aus den jeweils gewünschten Molverhältnissen Äthylenoxid und Propylenoxid nach an sich bekannten Methoden polymerisiert wird.
- Als Korrosionsinhibitoren zuzusetzende Fettsäuren kommen vor allem C12- bis C24-Monocarbonsäuren oder deren Derivate in Betracht.
- Im einzelnen kommen Fettsäuren mit und ohne olefinische Doppelbindungen, insbesondere C18-Fettsäuren, in Betracht. Geeignete Fettsäuren sind z. B. Ölsäure, Ricinolsäure, Stearinsäure, Linolsäure oder Linolensäure.
-
- Als weitere Inhibitoren und als Antioxydationsmittel kommen ebenfalls an sich bekannte Verbindungen in Betracht, wie sie z. B. in der US-PS 3 711 410, Spalten 9 bis 11, im einzelnen aufgeführt sind. Insbesondere sind zu nennen:
- Benzotriazol, Imidazol, Imidazolin, prim., sek. Amine, Äthanolamine, Bisphenol A, Triphenylphosphit oder 2,4-Di-tert.-butyl-kresol.
- Die erfindungsgemäßen Bremsflüssigkeiten können auch Borsäureester von Glykoläthern der Formel II enthalten, z. B. in Mengen von 20 bis 50 Gew.-%. Geeignete Borsäureester sind z. B. Methyl-tri-glykol-ortho-borat, Äthyl-tri-glykol-ortho-borat, Methyl-/Äthyl-di/tri-ortho-borat.
- Weitere Boresterverbindungen sind in der US-PS 3 711 410 im einzelnen beschrieben.
- Zur Untersuchung der imprägnierenden 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 handelsübliche Bremsflüssigkeit bzw. in die Bremsflüssigkeiten mit. verbessertem Korrosionsschutz ein, läßt 5 Sekunden abtropfen und lagert sie in einem geschlossenen Gefäß über einer wasserdampfgesättigten Atmosphäre. Hierbei zeigt sich, daß bei Verwendung handelsüblicher Bremsflüssigkeiten bereits nach wenigen Stunden ein starkes Rosten der Graugußteile beobachtet werden kann. Bei den erfindungsgemäßen Flüssigkeiten wird hingegen der Ansatz von Rost, selbst nach einer Lagerung von 30 Tagen über der wasserdampfgesättigten Atmosphäre bei Raumtemperatur vermieden.
- 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% Triäthylenglykol, 5% Butyltriglykol, 25% Äthyltriglykol, 29,4% Äthyldiglykol, 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 Glykoläther, 25% eines handelsüblichen Schmiermittels auf EO/PO-Basis (Molverhältnis 2 : 1, Molgewicht 1100), 3% einer Mischung von Korrosionsinhibitoren aus Benzotriazol, Dodecylamin, Triäthanolamin 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% Äthyltriglykol, 30% Äthyldiglykol, 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.
- 6. Im Feuchtigkeitskorrosionstest ergab eine Bremsflüssigkeit, bestehend aus: 10% eines Polypropylenglykols vom Molgewicht ca. 1000, 7,5% eines Polypropylenglykols, ca. Molgewicht 2000; 7,5% eines Schmiermittels, bestehend aus ca. 3 Mol Äthylenoxid und 3 Mol Propylenoxid, 20% Äthyltriglykol, 30% Äthyldiglykol, 0,5% Rizinolsäure, 0,05% Benzotriazol, 4,3% Korrosionsinhibitor (Umsetzungsprodukt aus Glycerin mit Borsäureester), 1% Dibutylamin, ca. 20% Methyltrilglykol. Das Produkt weist eine Viskosität von 1,175 - 10-3 m3/s bei -40°C auf, einen Kochpunkt von 218°C, pH-Wert 9,7; nach 30 Tagen keinen Rostansatz. Wird anstelle des Polypropylenglykols mit Molgewicht ca. 1000 + Polypropylenglykol mit Molgewicht ca. 2000 und dem EO/PO-Addukt ein handelsübliches Schmiermittel eingesetzt, so tritt bereits nach wenigen Tagen starker Korrosionsansatz ein.
- Aus der britischen Patentschrift 1 081 294 sind schon korrosionsinhibierende Fettsäuren enthaltende Bremsflüssigkeiten auf der Basis von Polyglykoläthern 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.
aufweisen.
Claims (7)
- Bremsflüssigkeiten auf der Basis von Polyglykoläthern und Polyglykolen mit einem Gehalt von Fettsäuren, dadurch gekennzeichnet, daß sie enthalten
- A) 10 bis 40 Gew.-%, bezogen auf die Bremsflüssigkeit, Polyalkylenglykole in Form von einheitlichen Verbindungen oder Gemischen von Verbindungen, derFormel
- B) 0,1 bis 3 Gew.-% einer an sich als Korrosionsinhibitor bekannten Fettsäure, sowie als Ergänzung zu 100% die folgenden Bestandteile,
- D) ggf. Polyglykole des Äthylenoxids und/oder Propylenoxids mit einem Molekulargewicht im Molekulargewichtsbereich üblicher Schmiermittel in Bremsflüssigkeiten, und/oder
- E) ggf. 20 bis 50 Gew.-% von Borsäureestern von Glykoläthern der Formel und
- F) geringe Mengen an sich bekannter Antioxydantien und Inhibitoren.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2851057 | 1978-11-25 | ||
DE19782851057 DE2851057A1 (de) | 1978-11-25 | 1978-11-25 | Bremsfluessigkeiten mit konservierender wirkung |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0011730A1 EP0011730A1 (de) | 1980-06-11 |
EP0011730B1 true EP0011730B1 (de) | 1982-10-06 |
EP0011730B2 EP0011730B2 (de) | 1986-06-04 |
Family
ID=6055539
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP79104326A Expired EP0011730B2 (de) | 1978-11-25 | 1979-11-06 | Bremsflüssigkeiten mit konservierender Wirkung mit einem Gehalt an Ölsäure |
Country Status (2)
Country | Link |
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EP (1) | EP0011730B2 (de) |
DE (2) | DE2851057A1 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
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IT1227061B (it) * | 1988-09-13 | 1991-03-14 | Lubritalia Spa | Fluidi idrodinamici di sicurezza resistenti alla propagazione della fiamma e con elevata temperatura di autoaccensione e procedimento per la loro preparazione. |
US6855676B2 (en) | 2002-02-11 | 2005-02-15 | Ecolab., Inc. | Lubricant for conveyor system |
JP5480285B2 (ja) * | 2008-11-07 | 2014-04-23 | ダウ グローバル テクノロジーズ エルエルシー | 低粘度機能性流体 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
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US2434978A (en) * | 1944-04-15 | 1948-01-27 | William A Zisman | Anticorrosion additives for synthetic lubricants |
NL302392A (de) * | 1962-12-28 | |||
GB1388012A (en) * | 1972-02-09 | 1975-03-19 | Shell Int Research | Hydraulic fluids and their preparation |
-
1978
- 1978-11-25 DE DE19782851057 patent/DE2851057A1/de not_active Withdrawn
-
1979
- 1979-11-06 DE DE7979104326T patent/DE2963824D1/de not_active Expired
- 1979-11-06 EP EP79104326A patent/EP0011730B2/de not_active Expired
Also Published As
Publication number | Publication date |
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DE2963824D1 (en) | 1982-11-11 |
DE2851057A1 (de) | 1980-06-12 |
EP0011730A1 (de) | 1980-06-11 |
EP0011730B2 (de) | 1986-06-04 |
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