EP0129240B2 - Hydraulic fluids - Google Patents

Hydraulic fluids Download PDF

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Publication number
EP0129240B2
EP0129240B2 EP84106971A EP84106971A EP0129240B2 EP 0129240 B2 EP0129240 B2 EP 0129240B2 EP 84106971 A EP84106971 A EP 84106971A EP 84106971 A EP84106971 A EP 84106971A EP 0129240 B2 EP0129240 B2 EP 0129240B2
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EP
European Patent Office
Prior art keywords
glycol
ether
weight
fluid
ranging
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 - Lifetime
Application number
EP84106971A
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German (de)
English (en)
French (fr)
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EP0129240B1 (en
EP0129240A1 (en
Inventor
Franco Dr. Galati
Mario Dr. Musco
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Montedison SpA
Original Assignee
Montedison SpA
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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
    • C10M111/00—Lubrication compositions characterised by the base-material being a mixture of two or more compounds covered by more than one of the main groups C10M101/00 - C10M109/00, each of these compounds being essential
    • C10M111/04—Lubrication compositions characterised by the base-material being a mixture of two or more compounds covered by more than one of the main groups C10M101/00 - C10M109/00, each of these compounds being essential at least one of them being a macromolecular organic compound
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    • C10M105/00—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound
    • C10M105/02—Well-defined hydrocarbons
    • C10M105/04—Well-defined hydrocarbons aliphatic
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    • C10M105/00—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound
    • C10M105/08—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound containing oxygen
    • C10M105/18—Ethers, e.g. epoxides
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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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    • 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
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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
    • 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

  • the present invention relates to liquid compositions that are suited a hydraulic fluids for the transmission of power, particularly as hydraulic brake fluids, and which may contain boron, and consist of mixtures of glycols, glycolethers of various molecular weights and, optionally, boric glycolesters.
  • the braking systems of motor vehicles represent an important safety element, and the efficient performance of the brakes is, to a large extent, determined by the characteristics of the hydraulic fluids used in said braking systems. Therefore. according to current regulations, said fluids have to meet very strict requirements as to e.g. boiling point, viscosity at hign and low temperatures, the pH value, the stability at low and high temperatures, corroding effect on metals and swelling action on rubbers.
  • Said characteristics are closely related to the hygroscopicity of the fluids in question.
  • the hydraulic brake fluids normally used must meet all FMVSS 116, DOT-3 and DOT-4 (i.e.: Federal Motor-Vehicle Safety Standard-Department of Transportation) and SAE J 1703 (Society of Automotive Engineers N.Y) standards.
  • the brake fluids belonging to the classes DOT-3 and DOT-4 have the following characteristics:
  • hydraulic brake fluids consist of a mixture of alcohols, glycols, glycolethers, polyglycols, polyglycolethers and derivatives thereof.
  • FR-A-2 158 523 describes liquid compositions for brakes belonging to the class DOT-4, consisting of mixtures of tetraethylene glycol, other glycols and lower glycolethers. Said compositions possess a WET PERT slightly greater than 155°C (max. 156.5°C in Example 2). and high viscosity values at low temperatures, due to the presence of tetraethylene glycol (1590 mm 2 /s (cSt) at -40°C in Example 1).
  • DOT-3/DOT-4 have been found in the boric esters of the glycols, and more particularly in the products of the partial or total esterification with boric acid of one or more of the components of the traditional formulations based on alcohols, glycols, glycolethers, polyglycols and polyglycolethers.
  • DE-C-939045 discloses the use of boric esters of mono- or polyvalent alcohols, alkanol amines or thio- polyglycols as additive for hydraulic fluids based on glycols. Said boric esters are used in amounts of 5 to 15% by weight and are supposed to improve the lubrication provided by said hydraulic fluids.
  • US-A-3 625 899 describes hydraulic brake fluids consisting of mixtures of at least one boric ester of an etherified glycol, of a polyglycol and a monoether or diether glycol.
  • organoborates used in the process have the drawback of either causing the swelling of the rubber (esters of etherified glycols) or resulting in high viscosities (esters of glycols). At any rate, they un- avoiaaoiy cause higher costs in comparison to the traditional formulations.
  • a brake fluid that may be a DOT-4 also in the absence of boron and, more in general, that shall have superior characteristics of resistance to moisture also in the presence of only slight quantities of boric esters.
  • compositions suited for use as hydraulic fluids which, though not containing boron compounds, possess WET PERT greater than 155°C and viscosities at - 40°C below 1500 mm 2 /s (cSt), that is, fluids belonging to the classes DOT-3 (as regards the viscosity) and DOT-4 (as regards the WET PERT) at the same time.
  • Still another object of this invention is to provide compositions containing boric esters which, at the same boron content, have WET PERT values greater than those of the compositions of the prior art.
  • a further object of the present invention is to provide brake fluids which meet all the DOT-3 and DOT4 specifications; more particularly such which meet the non-aggressiveness standards towards rubber and the metals present in the braking system.
  • This invention refers to boron containing a hydraulic fluid containing a glycol, a light ether of a glycol and a heavy ether of a glycol, characterized in that:
  • the heavy ether is selected from the monomethylether of tetraethylene glycol, the monomethylether of pentaethylene glycol, the methyl or butyl ether of a polyoxyalkylene glycol (having a molecular weight substantially equal to or lower than 520 and containing both oxypropylene and oxyethylene monomeric units) and mixtures thereof.
  • additives for the purpose of boosting the performance of the braking fluids.
  • the various possible types of additives comprise: buffering agents, corrosion inhibitors, antioxidants, substances increasing the protective power with respect to ferrous metals in a humid and oxidizing environment, stabilizers, dyestuffs.
  • the quantity of additives that may be incorporated into the hydraulic fluids varies from 0% to 10%, based on the total weight of the hydraulic fluids.
  • a preferred hydraulic fluid contains from 0 to 10% by weight, based on the total weight of the fluid, of an inhibitor consisting of a mixture of:
  • the preparation of the boric esters is carried out at atmospheric pressure, preferably in the presence of an azeotropic solvent, or at a reduced pressure in the absence of a solvent, at temperatures between 50°C and 200°C.
  • the hydraulic fluid contains a glycol, a light ether of a glycol and a heavy ether of a glycol, but no boron, and is characterized in that
  • the liquid compositions obtained by means of the present invention display all a WET PERT greater than 155°C (lower limit of DOT-4 class), viscosity values at -40°C lower than 1500 mm 2 /s (cSt) (upper limit of class DOT-3), and PERT values of about 250°C and above.
  • the formulation of the hydraulic fluids according to the present invention is accomplished by mixing together the individual components and additives in a mixer until achieving a thorough and complete homogenization.
  • the mixing is carried out at atmospheric pressure, room temperature and, preferably, in the absence of humidity.
  • FR-A-1 233 918 discloses hydraulic fluids containing more than 20% by weight of a polyoxyalkylene having a molecular weight of >500, at least 35% by weight of an ether of diethylene glycol and at least 5% by weight of a glycol, an alcohol, a triethylene glycol ether or mixtures thereof.
  • a preferred molecular weight of the polyoxyalkylene which, among others, may be a monoether of a polyalkylene glycol, is 2000 to 6000.
  • the molecular weight of the heavy ether may at the most be 600. This allows to reduce the amount of glycol to a minimum and at the same time to maintain a WET PERT which is considerably higher than that of the hydraulic fluids of the prior art.
  • a braking fluid was prepared by mixing together the following components:
  • This braking fluid possesses the following properties:
  • a hydraulic fluid was prepared by mixing together the following components:
  • This fluid showed the following properties:
  • a hydraulic fluid was prepared by mixing together the following components:
  • This fluid showed the following properties:
  • a hydraulic brake fluid was prepared by mixing the following components:
  • This fluid showed the following properties:
  • a hydraulic fluid was prepared by mixing together the following components:
  • This fluid showed the following properties:
  • a hydraulic fluid was prepared, containing 0.1% of boron, by mixing together the following components:
  • the fluid showed the following properties:
  • a hydraulic fluid containing 0.46% of boron, was prepared by mixing together the following components:
  • This fluid showed the following properties:
  • a hydraulic fluid containing 0.5% of boron, was prepared by mixing together the following components:
  • This fluid showed the following properties:
  • a hydraulic fluid containing 0.7% of boron, was prepared by mixing together the following components:
  • This fluid showed the following properties:
  • a hydraulic fluid, containing 0.46% of boron. was prepared by mixing together the following components:
  • This fluid showed the following properties:
  • a hydraulic fluid containing 0.43% boron, was prepared by mixing together the following components:
  • This fluid showed the following properties:
  • This fluid showed the following properties:

Landscapes

  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Emergency Medicine (AREA)
  • Engineering & Computer Science (AREA)
  • Lubricants (AREA)
EP84106971A 1983-06-21 1984-06-18 Hydraulic fluids Expired - Lifetime EP0129240B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT21698/83A IT1163547B (it) 1983-06-21 1983-06-21 Fluidi idraulici
IT2169883 1983-06-21

Publications (3)

Publication Number Publication Date
EP0129240A1 EP0129240A1 (en) 1984-12-27
EP0129240B1 EP0129240B1 (en) 1988-03-30
EP0129240B2 true EP0129240B2 (en) 1994-06-01

Family

ID=11185563

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Application Number Title Priority Date Filing Date
EP84106971A Expired - Lifetime EP0129240B2 (en) 1983-06-21 1984-06-18 Hydraulic fluids

Country Status (4)

Country Link
EP (1) EP0129240B2 (it)
JP (1) JPS6013892A (it)
DE (1) DE3470176D1 (it)
IT (1) IT1163547B (it)

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Publication number Priority date Publication date Assignee Title
AU2003291018A1 (en) * 2002-12-09 2004-06-30 Union Carbide Chemicals And Plastics Technology Cor Poration Alkoxylates as such or as base oils for hydraulic compositions
DE10310757A1 (de) * 2003-03-12 2004-09-23 Basf Ag DOT 4-Bremsflüssigkeiten
AU2013287199A1 (en) * 2012-03-23 2014-10-16 Basf Se Fluid composition for a vibration dampener
SG10201701993TA (en) * 2013-03-12 2017-05-30 Lubrizol Corp Lubricating Composition Containing Lewis Acid Reaction Product
EP3929269A1 (en) 2020-06-22 2021-12-29 Clariant International Ltd Low viscosity functional fluid composition
EP4056669A1 (en) 2021-03-12 2022-09-14 Clariant International Ltd Low viscosity functional fluid composition
EP4130211A1 (en) 2021-08-02 2023-02-08 Clariant International Ltd Low viscosity functional fluid composition

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE939045C (de) * 1952-02-19 1956-02-16 Anorgana G M B H Hydraulische Fluessigkeiten
BE581961A (it) * 1958-08-27
JPS5440978A (en) * 1977-09-06 1979-03-31 Nippon Nyukazai Co Ltd Additive agent for operation liquid

Also Published As

Publication number Publication date
IT1163547B (it) 1987-04-08
JPS6013892A (ja) 1985-01-24
EP0129240B1 (en) 1988-03-30
IT8321698A0 (it) 1983-06-21
EP0129240A1 (en) 1984-12-27
JPH0458520B2 (it) 1992-09-17
DE3470176D1 (en) 1988-05-05

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