US2402754A - Hydraulic pressure fluid - Google Patents

Hydraulic pressure fluid Download PDF

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Publication number
US2402754A
US2402754A US48827343A US2402754A US 2402754 A US2402754 A US 2402754A US 48827343 A US48827343 A US 48827343A US 2402754 A US2402754 A US 2402754A
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Prior art keywords
hydraulic pressure
pressure fluid
fluid
approximately
tetradecanol
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Classifications

    • 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
    • C10M3/00—Liquid compositions essentially based on lubricating components other than mineral lubricating oils or fatty oils and their use as lubricants; Use as lubricants of single liquid substances
    • 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
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/02—Hydroxy compounds
    • C10M2207/021—Hydroxy compounds having hydroxy groups bound to acyclic or cycloaliphatic carbon atoms
    • 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
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/02—Hydroxy compounds
    • C10M2207/021—Hydroxy compounds having hydroxy groups bound to acyclic or cycloaliphatic carbon atoms
    • C10M2207/022—Hydroxy compounds having hydroxy groups bound to acyclic or cycloaliphatic carbon atoms containing at least two hydroxy groups
    • 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
    • C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
    • 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
    • C10M2209/104—Polyethers, i.e. containing di- or higher polyoxyalkylene groups of alkylene oxides containing two carbon atoms only
    • 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
    • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2215/02—Amines, e.g. polyalkylene polyamines; Quaternary amines
    • C10M2215/04—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to acyclic or cycloaliphatic carbon atoms
    • 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
    • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2215/26—Amines
    • 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

  • This invention relates to hydraulic pressure fluids, such as brake fluids.
  • An object of the invention is to improve the lubricating value of the fluid, while at the same time meeting all known requirements of a satisfactory fluid, and utilizing only materials already on the market or known to be readily available.
  • the lubricating value of a hydraulic pressure fluid may be due to either or both 01' two factors.
  • One is the hydrodynamic quality of the fluid, due in part to its viscosity characteristics, which is especially high in certain ethers and esters of considerable molecular weight.
  • the other is the ability of the fluid to provide boundary lubrication, due to direct adhesion of molecules to the metal surfaces, giving a lubricant film of molecular proportions directly on the surface to be lubricated.
  • Boundary lubricants are straight chain or slightly branched higher alcohols with more than eight carbon atoms in the main chain, andthose which remain liquid at low temperatures are suitable for use in brake fluids. In addition to their action in forming a lubricating film on metals, these alcohols are taken up by rubber to form an internal lubricant, acting to maintain flexing over a longer period of time and to eliminate scuiling and disintegration.
  • trimethylene glycol HQ-CH'r-CHr-CHHH
  • HQ-CH'r-CHr-CHHH trimethylene glycol
  • a suitable solvent as, i'or example, 34.85% carbltol" (monoethyl ether of diethylene glycol, or
  • boilingpoint is,393 F.; its stability is such that it does not boil it kept at 295 F. for twohours; its flash point is 235 F.; it mixes with the principal brake fluids now on the market and remains cleardown to F.; the water tolerance is 14% at 74 F.; when contaminated with 4% 01' water it remains clearat 40 F. and in dry ice; it does not corrode the metals used in brake systems;-
  • a hydraulic pressure fluid consisting of approximately 10% ora boundary lubricant selected from the group consisting of tetradecanol and heptadecanol, approximately 25% or ditethoxydiethylene glycol) phthalate, approximately 20% of trimethylene glycol, approximately 34.85% of monoethyl ether of diethylene glycol, approximately 10.00% of diethylene glycol monobutyl ether, and approximately of diamylamine phosphate.

Description

Patented June 25, 1946 2,402,754 HYDRAULIC PRESSURE FLUID Donald L. Katz and Arnuli K. Esterer, Ann Arbor, Mloln, assig'nors to Hydraulic Brake Company, Detroit, Mich a corporation of California No Drawing. Application May 24, 1943,
Serial No. 488,273
This invention relates to hydraulic pressure fluids, such as brake fluids.
An object of the invention is to improve the lubricating value of the fluid, while at the same time meeting all known requirements of a satisfactory fluid, and utilizing only materials already on the market or known to be readily available.
The lubricating value of a hydraulic pressure fluid may be due to either or both 01' two factors. One is the hydrodynamic quality of the fluid, due in part to its viscosity characteristics, which is especially high in certain ethers and esters of considerable molecular weight. The other is the ability of the fluid to provide boundary lubrication, due to direct adhesion of molecules to the metal surfaces, giving a lubricant film of molecular proportions directly on the surface to be lubricated.
Boundary lubricants are straight chain or slightly branched higher alcohols with more than eight carbon atoms in the main chain, andthose which remain liquid at low temperatures are suitable for use in brake fluids. In addition to their action in forming a lubricating film on metals, these alcohols are taken up by rubber to form an internal lubricant, acting to maintain flexing over a longer period of time and to eliminate scuiling and disintegration.
1 Claim. ((31. 25248) i In one very efl'ective fluid which we have successiully tested, the boundary lubrication, as well as a substantial measure 01' hydrodynamic lubrication, is provided by the use of tetradecanol (7 ethyl-z-methylundecanol-i) or heptadecanol (3,0-diethyltridecanol-6). For example, 10.00% of tetradecanol may be used to advantage with 25.00% or "carbitol phthalate", or di(ethoxy-diethylene glycol) phthalate, with the formula:
and 20.00% of trimethylene glycol (HQ-CH'r-CHr-CHHH) This is used with a suitable solvent, as, i'or example, 34.85% carbltol" (monoethyl ether of diethylene glycol, or
mixed with 10% of butyl carbitor (diethylene meniscus returns to level after three seconds; its
boilingpoint is,393 F.; its stability is such that it does not boil it kept at 295 F. for twohours; its flash point is 235 F.; it mixes with the principal brake fluids now on the market and remains cleardown to F.; the water tolerance is 14% at 74 F.; when contaminated with 4% 01' water it remains clearat 40 F. and in dry ice; it does not corrode the metals used in brake systems;-
and its density is 8.565 lbs. per gallon at 68 F. In'bur copending application, flied May 24, 1943, Serial No. 488,268. we have described and claimed another satisfactory fluid containing tetradecanol (or heptadecanol), and in our copending application, flled May 24, 1943, Serial No, 488,271, we have described and claimed -another fluid containing "carbitoP phthalate.
While the proportions and constituents of one fluid which we now regard as most advantageous are given above, it is not our intention to limit the scope of our invention thereby, or otherwise than by the terms of the appended claim.
We claim:
A hydraulic pressure fluid consisting of approximately 10% ora boundary lubricant selected from the group consisting of tetradecanol and heptadecanol, approximately 25% or ditethoxydiethylene glycol) phthalate, approximately 20% of trimethylene glycol, approximately 34.85% of monoethyl ether of diethylene glycol, approximately 10.00% of diethylene glycol monobutyl ether, and approximately of diamylamine phosphate.
DONALD L. KATZ. ARN'ULF K. ESTERER.
US48827343 1943-05-24 1943-05-24 Hydraulic pressure fluid Expired - Lifetime US2402754A (en)

Priority Applications (1)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2469285A (en) * 1947-03-18 1949-05-03 Genesee Res Corp Hydraulic pressure transmitting fluid
US2542785A (en) * 1947-12-29 1951-02-20 Du Pont Hydraulic fluids
US2905642A (en) * 1956-02-27 1959-09-22 Gen Aniline & Film Corp Viscosity hydraulic fluid
US2944973A (en) * 1955-11-14 1960-07-12 Union Carbide Corp Di-ester fluids with improved water tolerance
US2956870A (en) * 1956-10-19 1960-10-18 Texaco Inc Process for suppressing deposit formation in an internal combustion engine
US20160040609A1 (en) * 2013-03-28 2016-02-11 Mtu Friedrichshafen Gmbh Method and device for operating a dual-fuel internal combustion engine

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2469285A (en) * 1947-03-18 1949-05-03 Genesee Res Corp Hydraulic pressure transmitting fluid
US2542785A (en) * 1947-12-29 1951-02-20 Du Pont Hydraulic fluids
US2944973A (en) * 1955-11-14 1960-07-12 Union Carbide Corp Di-ester fluids with improved water tolerance
US2905642A (en) * 1956-02-27 1959-09-22 Gen Aniline & Film Corp Viscosity hydraulic fluid
US2956870A (en) * 1956-10-19 1960-10-18 Texaco Inc Process for suppressing deposit formation in an internal combustion engine
US20160040609A1 (en) * 2013-03-28 2016-02-11 Mtu Friedrichshafen Gmbh Method and device for operating a dual-fuel internal combustion engine

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