EP0087386B1 - Hydraulic fluid - Google Patents

Hydraulic fluid Download PDF

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Publication number
EP0087386B1
EP0087386B1 EP83810039A EP83810039A EP0087386B1 EP 0087386 B1 EP0087386 B1 EP 0087386B1 EP 83810039 A EP83810039 A EP 83810039A EP 83810039 A EP83810039 A EP 83810039A EP 0087386 B1 EP0087386 B1 EP 0087386B1
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EP
European Patent Office
Prior art keywords
weight
hydraulic fluid
parts
polyisobutylene
aluminum
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
EP83810039A
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German (de)
French (fr)
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EP0087386A1 (en
Inventor
Rudolf Baur
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Alcan Holdings Switzerland AG
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Schweizerische Aluminium AG
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Publication date
Application filed by Schweizerische Aluminium AG filed Critical Schweizerische Aluminium AG
Priority to AT83810039T priority Critical patent/ATE15911T1/en
Publication of EP0087386A1 publication Critical patent/EP0087386A1/en
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Publication of EP0087386B1 publication Critical patent/EP0087386B1/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
    • 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
    • C10M169/045—Mixtures of base-materials and additives the additives being a mixture of compounds of unknown or incompletely defined constitution and non-macromolecular compounds
    • 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
    • C10M101/00—Lubricating compositions characterised by the base-material being a mineral or fatty oil
    • C10M101/04—Fatty oil fractions
    • 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
    • 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
    • C10M105/32—Esters
    • C10M105/34—Esters of monocarboxylic acids
    • 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
    • C10M107/02—Hydrocarbon polymers; Hydrocarbon polymers modified by oxidation
    • C10M107/08—Hydrocarbon polymers; Hydrocarbon polymers modified by oxidation containing butene
    • 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
    • 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
    • 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
    • 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
    • C10M129/68—Esters
    • C10M129/70—Esters of monocarboxylic acids
    • 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
    • C10M159/00—Lubricating compositions characterised by the additive being of unknown or incompletely defined constitution
    • C10M159/02—Natural products
    • C10M159/08—Fatty oils
    • 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
    • C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
    • C10M2205/02—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers
    • C10M2205/026—Butene
    • 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
    • C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
    • C10M2205/02—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers
    • C10M2205/026—Butene
    • C10M2205/0265—Butene 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
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/28—Esters
    • C10M2207/281—Esters of (cyclo)aliphatic monocarboxylic acids
    • 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
    • C10M2207/28—Esters
    • C10M2207/282—Esters of (cyclo)aliphatic oolycarboxylic acids
    • 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
    • C10M2207/28—Esters
    • C10M2207/283—Esters of polyhydroxy compounds
    • 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
    • C10M2207/28—Esters
    • C10M2207/284—Esters of aromatic monocarboxylic acids
    • 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
    • C10M2207/28—Esters
    • C10M2207/286—Esters of polymerised unsaturated acids
    • 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
    • C10M2207/40—Fatty vegetable or animal oils
    • 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
    • C10M2207/40—Fatty vegetable or animal oils
    • C10M2207/401—Fatty vegetable or animal oils 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
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/40—Fatty vegetable or animal oils
    • C10M2207/402—Castor oils
    • 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
    • C10M2207/40—Fatty vegetable or animal oils
    • C10M2207/404—Fatty vegetable or animal oils obtained from genetically modified species
    • 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
    • C10M2207/40—Fatty vegetable or animal oils
    • C10M2207/404—Fatty vegetable or animal oils obtained from genetically modified species
    • C10M2207/4045—Fatty vegetable or animal oils obtained from genetically modified species 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

Definitions

  • the invention relates to a hydraulic fluid, in particular for supplying hydrostatic support sources for rolls for the roll forming of aluminum and aluminum alloys.
  • thermolytically changed traces of hydraulic fluid left on the surface of aluminum foils after degreasing in an oxygen-containing atmosphere show undesirable effects.
  • both the loss angle (tgd) of the windings and their aging behavior under current load are adversely affected.
  • the inventor has set himself the task of creating a hydraulic fluid which is suitable for supplying hydrostatic support sources and which does not lead to any undesirable changes on the aluminum surface when aluminum is rolled when it comes into the rolling oil.
  • the liquid contains 100 parts by weight of polyisobutylene, 3 to 15 parts by weight of butyl stearate and 0.5 to 5 parts by weight of palm kernel fat.
  • Polyisobutylene serves as the base liquid and carrier of the trybophysical properties.
  • Butyl stearate is added to the base liquid as a lubricant additive.
  • Palm kernel fat acts as a rust inhibitor and, as a reaction layer, also improves the emergency running properties of the hydraulic fluid. All components of this liquid can be easily removed from aluminum surfaces by degreasing.
  • polyisobutylene is preferably used as a mixture of a first polyisobutylene with an average molecular weight of about 460 and a second polyisobutylene with an average molecular weight of about 320.
  • the weight ratio of the first polyisobutylene to the second polyisobutylene is preferably 1: 9 to 1: 1, in particular 1: 4 to 1: 1.5.
  • the proportion of butyl stearate is preferably between 5 and 10 parts by weight.
  • the hydraulic fluid preferably contains 1 to 3 parts by weight of palm kernel fat, the content of free fatty acids of which should not exceed 0.2% by weight for reasons of corrosion.
  • composition of the hydraulic fluid according to the invention listed below has been found to be particularly suitable both in terms of its tribophysical properties and in terms of its compatibility with freshly rolled aluminum surfaces for feeding the support sources of roll shells for support rolls for the roll forming of aluminum strips into film:
  • the kinematic viscosity of this composition is 270 mm 2 / s (cSt) at 20 "C, 52 mm 2 / s (cSt) at 50 ° C and 34 mm 2 / s (cSt) at 60 ° C. It is particularly suitable for one Permanent temperature load in the range of 30 to 60 ° C suitable.

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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)
  • Forging (AREA)
  • Metal Rolling (AREA)

Abstract

A hydraulic fluid which contains 100 parts by weight of polyisobutylene, 3 to 15 parts by weight of butylstearate and 0.5 to 5 parts by weight of palm seed oil. It shows good compatibility with newly rolled aluminum surfaces and is therefore particularly suitable for feeding hydrostatic means of supporting rolls for roll-forming aluminum and aluminum alloys.

Description

Die Erfindung betrifft eine Hydraulikflüssigkeit, insbesondere zur Speisung von hydrostatischen Stützquellen von Walzen für das Walzverformen von Aluminium und Aluminiumlegierungen.The invention relates to a hydraulic fluid, in particular for supplying hydrostatic support sources for rolls for the roll forming of aluminum and aluminum alloys.

Bei Walzen mit hydrostatischen Stützquellen im Inneren von rotierenden Walzenmänteln wird den Stützquellen Hydraulikflüssigkeit zugeleitet. Der angeströmte hydrostatische Flüssigkeitsfilm zwischen den Stützquellen und den Walzenmantelinnenseiten überträgt die Walzkraft und führt die entstehende Verformungswärme ab.In the case of rollers with hydrostatic support sources inside rotating roller jackets, hydraulic fluid is fed to the support sources. The flow of hydrostatic liquid film between the support sources and the inside of the roll shell transfers the rolling force and dissipates the resulting heat of deformation.

Zur Sicherstellung der tribophysikalischen Eigenschaften einer Hydraulikflüssigkeit können handelsübliche Produkte mit den vom jeweiligen Hersteller des Walzgerüstes vorgeschriebenen Kennwerten verwendet werden. Bei der Walzverformung von Aluminium zu Folie muß aber trotz aller Vorsichtsmaßnahmen damit gerechnet werden, daß Hydraulikflüssigkeit in das Folienwalzöl gelangt. Schon relativ geringe Verschmutzungen des Folienwalzöles mit handelsüblichen Hydraulikflüssigkeiten führen zu starken Beeinträchtigungen der Oberflächenqualität von Aluminiumfolie. Die Lecköle, d. h. Hydraulikflüssigkeiten im Folienwalzöl, können durch die Einwirkung der Entfettungsglühung auf die gewalzten und umgewickelten Folienrollen zu folgenden Fehlern führen: klebende Folienbahnen, ungleichmäßig entfettete Folienoberflächen, dunkel gefärbte Glühflecken, weiß gefärbte Korrosionsflecken und kontaminierte Folienoberflächen. Die nach der Entfettungsglühung in sauerstoffhaltiger Atmosphäre auf der Oberfläche von Aluminiumfolien zurückbleibenden thermolytisch veränderten Hydraulikflüssigkeitsspuren zeigen unerwünschte Auswirkungen. So werden bei der Verwendung derartig kontaminierter Aluminiumfolien für die Herstellung von imprägnierten, physikalischen Kondensatoren sowohl die Verlustwinkel (tgd) der Wickel als auch deren Alterungsverhalten unter Strombelastung negativ beeinflußt. Ebenfalls unerwünschte Auswirkungen zeigen Leckölspuren auf Aluminiumfolien, die nach einer Glühung chemisch oder elektrochemisch geätzt werden und zur Herstellung von Elektrolytkondensatoren dienen.To ensure the tribophysical properties of a hydraulic fluid, commercially available products with the parameters specified by the respective manufacturer of the roll stand can be used. When rolling from aluminum to foil, despite all the precautionary measures, it must be expected that hydraulic fluid will get into the foil rolling oil. Even relatively little contamination of the foil rolling oil with commercially available hydraulic fluids leads to severe impairments of the surface quality of aluminum foil. The leak oils, i. H. Hydraulic fluids in the foil rolling oil can lead to the following faults due to the effect of degreasing annealing on the rolled and wrapped foil rolls: adhesive foil webs, unevenly degreased foil surfaces, dark colored glow spots, white colored corrosion spots and contaminated foil surfaces. The thermolytically changed traces of hydraulic fluid left on the surface of aluminum foils after degreasing in an oxygen-containing atmosphere show undesirable effects. When using such contaminated aluminum foils for the production of impregnated physical capacitors, both the loss angle (tgd) of the windings and their aging behavior under current load are adversely affected. Traces of oil leaks on aluminum foils, which are chemically or electrochemically etched after annealing and are used to manufacture electrolytic capacitors, also have undesirable effects.

Angesichts dieser Gegebenheiten hat sich der Erfinder die Aufgabe gestellt, eine zur Speisung von hydrostatischen Stützquellen geeignete Hydraulikflüssigkeit zu schaffen, die beim Walzverformen von Aluminium - wenn sie ins Walzöl gelangt - zu keinen unerwünschten Veränderungen auf der Aluminiumoberfläche führt.In view of these circumstances, the inventor has set himself the task of creating a hydraulic fluid which is suitable for supplying hydrostatic support sources and which does not lead to any undesirable changes on the aluminum surface when aluminum is rolled when it comes into the rolling oil.

Zur Lösung dieser Aufgabe führt erfindungsgemäß, daß die Flüssigkeit 100 Gewichtsteile Polyisobutylen, 3 bis 15 Gewichtsteile Butylstearat und 0,5 bis 5 Gewichtsteile Palmkernfett enthält.According to the invention, this object is achieved in that the liquid contains 100 parts by weight of polyisobutylene, 3 to 15 parts by weight of butyl stearate and 0.5 to 5 parts by weight of palm kernel fat.

Polyisobutylen dient als Basisflüssigkeit und Träger der trybophysikalischen Eigenschaften. Butylstearat wird der Basisflüssigkeit als Schmiermittelzusatz beigegeben. Palmkernfett wirkt als Rostinhibitor und verbessert als Reaktionsschichtbildner auch die Notlaufeigenschaften der Hydraulikflüssigkeit. Alle Bestandteile dieser Flüssigkeit sind durch eine Entfettungsglühung problemlos von Aluminiumoberflächen entfernbar.Polyisobutylene serves as the base liquid and carrier of the trybophysical properties. Butyl stearate is added to the base liquid as a lubricant additive. Palm kernel fat acts as a rust inhibitor and, as a reaction layer, also improves the emergency running properties of the hydraulic fluid. All components of this liquid can be easily removed from aluminum surfaces by degreasing.

Zur Einstellung der jeweils gewünschten kinematischen Viskosität wird Polyisobutylen bevorzugt als Mischung eines ersten Polyisobutylens mit einem mittleren Molekulargewicht von etwa 460 und eines zweiten Polyisobutylens mit einem mittleren Molekulargewicht von etwa 320 eingesetzt. Das Gewichtsverhältnis des ersten Polyisobutylens zum zweiten Polyisobutylen beträgt vorzugsweise 1 : 9 bis 1 : 1, insbesondere 1 : 4 bis 1 : 1,5.To set the desired kinematic viscosity, polyisobutylene is preferably used as a mixture of a first polyisobutylene with an average molecular weight of about 460 and a second polyisobutylene with an average molecular weight of about 320. The weight ratio of the first polyisobutylene to the second polyisobutylene is preferably 1: 9 to 1: 1, in particular 1: 4 to 1: 1.5.

Der Anteil von Butylstearat liegt vorzugsweise zwischen 5 und 10 Gewichtsteilen.The proportion of butyl stearate is preferably between 5 and 10 parts by weight.

Bevorzugt enthält die Hydraulikflüssigkeit 1 bis 3 Gewichtsteile Palmkernfett, wobei dessen Gehalt an freien Fettsäuren aus Korrosionsgründen maximal 0,2 Gew.-% betragen sollte.The hydraulic fluid preferably contains 1 to 3 parts by weight of palm kernel fat, the content of free fatty acids of which should not exceed 0.2% by weight for reasons of corrosion.

Um der Gefahr von korrosiven Einwirkungen der Hydraulikflüssigkeit weiter entgegenzuwirken, sollte ebenfalls darauf geachtet werden, daß die Flüssigkeit im wesentlichen frei von Wasserspuren ist.To further counteract the risk of corrosive effects of the hydraulic fluid, care should also be taken to ensure that the fluid is essentially free of traces of water.

Die nachstehend aufgeführte Zusammensetzung der erfindungsgemäßen Hydraulikflüssigkeit hat sich sowohl bezüglich ihrer tribophysikalischen Eigenschaften als auch hinsichtlich ihrer Verträglichkeit mit frisch gewalzten Aluminiumoberflächen zur Speisung der Stützquellen von Walzmänteln bei Stützwalzen für das Walzverformen von Aluminiumbändern zu Folie als besonders geeignet herausgestellt:

Figure imgb0001
The composition of the hydraulic fluid according to the invention listed below has been found to be particularly suitable both in terms of its tribophysical properties and in terms of its compatibility with freshly rolled aluminum surfaces for feeding the support sources of roll shells for support rolls for the roll forming of aluminum strips into film:
Figure imgb0001

Die kinematische Viskosität dieser Zusammensetzung beträgt 270 mm2/s (cSt) bei 20"C, 52 mm2/s (cSt) bei 50°C und 34 mm2/s (cSt) bei 60° C. Sie ist insbesondere für eine Dauertemperaturbelastung im Bereich von 30 bis 60°C geeignet.The kinematic viscosity of this composition is 270 mm 2 / s (cSt) at 20 "C, 52 mm 2 / s (cSt) at 50 ° C and 34 mm 2 / s (cSt) at 60 ° C. It is particularly suitable for one Permanent temperature load in the range of 30 to 60 ° C suitable.

Claims (7)

1. Hydraulic fluid, in particular for the feeding of hydrostatic support means of rolls for the roll- forming of aluminium and aluminium alloys, characterised in that the fluid contains 100 parts by weight of polyisobutylene, 3 to 15 parts by weight of butylstearate and 0.5 to 5 parts by weight of palm oil.
2. Hydraulic fluid according to claim 1, characterised by a mixture of a first polyisobutylene with an average molecular weight of about 460 and a second polyisutylene with an average molecular weight of about 320.
3. Hydraulic fluid according to claim 2, characterised in that the weight ratio of the first polyisobutylene to the second polyisobutylene is 1 : 9 to 1 : 1, preferably 1 : 4 to 1 : 1.5.
4. Hydraulic fluid according to claim 1, characterised by 5 to 10 parts by weight of butylstearate.
5. Hydraulic fluid according to claim 1, characterised by 1 to 3 parts of weight of palm oil.
6. Hydraulic fluid according to claim 5, characterised in that the concentration of free fatty acids in the palm oil is at most 0.2 per cent by weight.
7. Hydraulic fluid according to one of the claims 1 to 6, characterised in the fluid os essentially free of traces of water.
EP83810039A 1982-02-23 1983-02-01 Hydraulic fluid Expired EP0087386B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83810039T ATE15911T1 (en) 1982-02-23 1983-02-01 HYRAULIC FLUID.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH1091/82A CH649575A5 (en) 1982-02-23 1982-02-23 HYDRAULIC FLUID.
CH1091/82 1982-02-23

Publications (2)

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EP0087386A1 EP0087386A1 (en) 1983-08-31
EP0087386B1 true EP0087386B1 (en) 1985-10-02

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GB2185996B (en) * 1986-01-10 1989-12-28 Smallman Lubricants Limited Lubricating composition
DE68900213D1 (en) * 1988-05-10 1991-09-26 Hitachi Ltd METHOD FOR PRODUCING ELECTRICAL PIPING AGENTS WITH A LUBRICANT COMPOSITION.
CN105524684B (en) * 2015-11-19 2018-10-02 中铝润滑科技有限公司 A kind of aluminium cold rolling high temperature additive and its preparation and application

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US2899390A (en) * 1959-08-11 Non-staining aluminum rolling
US2366794A (en) * 1940-11-29 1945-01-09 Standard Oil Co Method of making shock absorber and hydraulic brake fluid
US2962401A (en) * 1958-03-17 1960-11-29 Aluminium Lab Ltd Cold deformation of metals
NL298362A (en) * 1962-09-26
BE672122A (en) * 1963-08-13
US3298951A (en) * 1966-01-24 1967-01-17 Roman D Guminski Stabilized polybutene composition
FR2159184B3 (en) * 1971-11-10 1974-06-21 Exxon Research Engineering Co
DE2302918C2 (en) * 1973-01-22 1982-04-08 Henkel KGaA, 4000 Düsseldorf New ester oils and their use in lubricants and hydraulic fluids
CH631481A5 (en) * 1977-06-02 1982-08-13 Alusuisse SYNTHETIC BEARING LUBRICANT.

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DE3207296C2 (en) 1984-05-30
EP0087386A1 (en) 1983-08-31
US4488979A (en) 1984-12-18
DE3360903D1 (en) 1985-11-07
ATE15911T1 (en) 1985-10-15
DE3207296A1 (en) 1983-09-08
CH649575A5 (en) 1985-05-31
JPS58160397A (en) 1983-09-22

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