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EP0011730B2 - Fluides de freinage à action conservatrice ayant une teneur en acide oléique - Google Patents

Fluides de freinage à action conservatrice ayant une teneur en acide oléique 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
Authority
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)
English (en)
Other versions
EP0011730A1 (fr
EP0011730B1 (fr
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/fr
Publication of EP0011730B2 publication Critical patent/EP0011730B2/fr
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    • 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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    • 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
    • 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.

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)

Claims (1)

  1. Liquides de frein à base d'éthers de polyglycols et de polyglycols ayant une teneur en acides gras, caractérisés en ce qu'ils contiennent
    A) 10 à 40% en poids, sur la base du liquide de frein, de polyalkylèneglycols, sous forme de composés unique ou de mélanges, de formule 1
    Figure imgb0009
    dans laquelle R représente un radical 1,2-éthylène et/ou 1,2-propylène, le nombre des radicaux propylène, rapporté au composé unique ou au mélange, étant prépondérant et n est un nombre de 10 ou plus, le poids moléculaire moyen étant en outre compris entre 500 et 3000,
    B) 0,1 à 3% en poids d'acide oléique, et, pour compléter à 100%, les composants suivants:
    C) des éthers de polyglycols de formule
    Figure imgb0010
    dans laquelle R1 représente un radical méthyle ou éthyle, R2 un atome d'hydrogène ou un radical méthyle et n est un nombre de 2 à 4,
    D) le cas échéant, des polyglycols de l'oxyde d'éthylène et/ou de l'oxyde de propylène ayant un poids moléculaire dans la gamme des poids moléculaires des lubrifiants utilisés d'habitude dans des liquides de frein, et/ou
    E) le cas échéant, 20 à 50% en poids d'esters de l'acide borique et d'éthers de glycol de formule Il et
    F) de petites quantités d'antioxydants et d'inhibiteurs connus en soi, choisis dans le groupe composé par le benzotriazole, l'imidazole, l'imidazoline, des amines primaires, secondaires, des éthanolamines, le bisphénol A, le triphénylphos- phite ou le 2,4-di-tert.butylcrésol.
EP79104326A 1978-11-25 1979-11-06 Fluides de freinage à action conservatrice ayant une teneur en acide oléique Expired EP0011730B2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19782851057 DE2851057A1 (de) 1978-11-25 1978-11-25 Bremsfluessigkeiten mit konservierender wirkung
DE2851057 1978-11-25

Publications (3)

Publication Number Publication Date
EP0011730A1 EP0011730A1 (fr) 1980-06-11
EP0011730B1 EP0011730B1 (fr) 1982-10-06
EP0011730B2 true EP0011730B2 (fr) 1986-06-04

Family

ID=6055539

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79104326A Expired EP0011730B2 (fr) 1978-11-25 1979-11-06 Fluides de freinage à action conservatrice ayant une teneur en acide oléique

Country Status (2)

Country Link
EP (1) EP0011730B2 (fr)
DE (2) DE2851057A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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.
RU2171829C1 (ru) * 2000-02-01 2001-08-10 Открытое акционерное общество "Нижнекамскнефтехим" Тормозная жидкость
US6855676B2 (en) 2002-02-11 2005-02-15 Ecolab., Inc. Lubricant for conveyor system
EP2346969A1 (fr) * 2008-11-07 2011-07-27 Dow Global Technologies LLC Liquides fonctionnels à faible viscosité

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2434978A (en) * 1944-04-15 1948-01-27 William A Zisman Anticorrosion additives for synthetic lubricants
NL302392A (fr) * 1962-12-28
GB1388012A (en) * 1972-02-09 1975-03-19 Shell Int Research Hydraulic fluids and their preparation

Also Published As

Publication number Publication date
DE2963824D1 (en) 1982-11-11
EP0011730A1 (fr) 1980-06-11
DE2851057A1 (de) 1980-06-12
EP0011730B1 (fr) 1982-10-06

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