EP0048216B1 - Oil-in-water emulsion for the cold rolling of aluminium and its alloys - Google Patents

Oil-in-water emulsion for the cold rolling of aluminium and its alloys Download PDF

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Publication number
EP0048216B1
EP0048216B1 EP81810351A EP81810351A EP0048216B1 EP 0048216 B1 EP0048216 B1 EP 0048216B1 EP 81810351 A EP81810351 A EP 81810351A EP 81810351 A EP81810351 A EP 81810351A EP 0048216 B1 EP0048216 B1 EP 0048216B1
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Prior art keywords
oil
emulsion
water
cold rolling
aluminium
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Expired
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EP81810351A
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German (de)
French (fr)
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EP0048216A1 (en
Inventor
Rudolf Baur
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Alcan Holdings Switzerland AG
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Schweizerische Aluminium AG
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    • 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
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    • 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
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    • C10M2217/00—Organic macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2217/04—Macromolecular compounds from nitrogen-containing monomers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
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    • C10M2217/00—Organic macromolecular compounds containing nitrogen as ingredients in lubricant compositions
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    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/20—Metal working
    • C10N2040/24—Metal working without essential removal of material, e.g. forming, gorging, drawing, pressing, stamping, rolling or extruding; Punching metal
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    • C10N2040/00—Specified use or application for which the lubricating composition is intended
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    • C10N2040/245—Soft metals, e.g. aluminum
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Definitions

  • the invention relates to an oil-in-water emulsion for cold rolling aluminum and aluminum alloys, with a hydrodynamic film former or reaction layer former, polyethoxylated sorbitan oleate as an emulsifier, unsaturated, long-chain alkyl monocarboxylic acids as an inhibitor against hydrogen embrittlement and rust formation, hexamethylene tetramine and stabilizer, fungus Bactericide and deionized water.
  • oil-in-water emulsions allow much better cooling due to the greater heat of evaporation of water and thus greater stitch reduction and / or increased rolling speed.
  • aqueous rolling agents pose greatly reduced exhaust air problems and are less dependent on oil. For this reason, many attempts have been made in the aluminum industry to use oil-in-water emulsions when cold rolling strips.
  • a major disadvantage of the oil-in-water emulsions belonging to the prior art is that the metal surface freshly produced by the rolling process reacts with water within a few seconds. This superficial corrosion attack as a result of the water phase leads to annoying spots on the belt surface. The reduced surface quality of a tape or film due to the formation of these so-called water stains is inadequate for many applications.
  • the inventor has set himself the task of creating an oil-in-water emulsion of the type mentioned at the beginning for cold rolling aluminum and aluminum alloys, with which the formation of water spots on the freshly rolled strip surface can be reduced.
  • the object is achieved in that the emulsion additionally contains 0.1 to 3 percent by weight of xylitol and sorbitol as inhibitors against water stain formation.
  • xylitol and sorbitol to an oil-in-water emulsion largely prevents the formation of water stains. It is therefore no longer absolutely necessary to remove the emulsion from the surface of the freshly rolled strips.
  • the inhibitor is already fully effective when 1000 parts by weight of the emulsion contain 1 to 30 parts by weight of xylitol and sorbitol.
  • the effect of the inhibitor composed of xylitol and sorbitol can be increased further by adding glycerol.
  • 1000 parts by weight of the emulsion contain 20 to 90 parts by weight of glycerin.

Description

Die Erfindung bezieht sich auf eine ÖI-in-Wasser-Emulsion zum Kaltwalzen von Aluminium und Aluminiumlegierungen, mit einem hydrodynamischen Filmbildner bzw. Reaktionsschichtbildner, polyäthoxylierten Sorbitanoleaten als Emulgator, ungesättigten, langkettigen Alkylmonocarbonsäuren als Inhibitor gegen Wasserstoffversprödung und Rostbildung, Hexamethylentetramin als Stabilisator, Fungicid und Baktericid sowie deionisiertem Wasser.The invention relates to an oil-in-water emulsion for cold rolling aluminum and aluminum alloys, with a hydrodynamic film former or reaction layer former, polyethoxylated sorbitan oleate as an emulsifier, unsaturated, long-chain alkyl monocarboxylic acids as an inhibitor against hydrogen embrittlement and rust formation, hexamethylene tetramine and stabilizer, fungus Bactericide and deionized water.

Verglichen mit Walzschmiermitteln auf Ölbasis ermöglichen Öl-in-Wasser-Emulsionen wegen der grösseren Verdampfungswärme von Wasser eine viel bessere Kühlung und damit eine grössere Stichabnahme und/oder erhöhte Walzgeschwindigkeit. Neben diesen rein wirtschaftlichen Faktoren, die Rationalisierungsbestrebungen weitgehend entgegenkommen, muss weiter berücksichtigt werden, dass wässrige Walzmittel stark verminderte Abluftprobleme stellen und weniger vom Erdöl abhängig sind. Deshalb sind in der Aluminiumindustrie schon viele Versuche unternommen worden, beim Kaltwalzen von Bändern ÖI-in-Wasser-Emulsionen einzusetzen.Compared to oil-based rolling lubricants, oil-in-water emulsions allow much better cooling due to the greater heat of evaporation of water and thus greater stitch reduction and / or increased rolling speed. In addition to these purely economic factors, which largely meet rationalization efforts, it must also be taken into account that aqueous rolling agents pose greatly reduced exhaust air problems and are less dependent on oil. For this reason, many attempts have been made in the aluminum industry to use oil-in-water emulsions when cold rolling strips.

Aus der DE-AS 26 32 142 ist eine ÖI-in-Wasser-Emulsion zum Kaltwalzen von Leichtmetallen bekannt, die Alkylmonocarbonsäureester als Reaktionsschichtbildner, Polyisobutylen als hydrodynamischen Filmbildner, polyäthoxylierte Sorbitanoleate als Emulgator, ungesättigte, langkettige Alkylmonocarbonsäuren als Inhibitor gegen Wasserstoffversprödung und Rostbildung, Hexamethylentetramin als Stabilisator, Fungicid und Baktericid, Rest deionisiertes Wasser enthält.From DE-AS 26 32 142 an oil-in-water emulsion for cold rolling light metals is known, the alkyl monocarboxylic acid esters as reaction layer formers, polyisobutylene as hydrodynamic film formers, polyethoxylated sorbitanoleates as emulsifiers, unsaturated, long-chain alkyl monocarboxylic acids as inhibitors against hydrogen embrittlement and hexamine embrittlement and rust amine embrittlement and hexamine embrittlement and rust formation as stabilizer, fungicide and bactericide, the rest contains deionized water.

Ein wesentlicher Nachteil der dem Stand der Technik zugehörigen ÖI-in-Wasser-Emulsionen liegt darin, dass die durch den Walzvorgang frisch erzeugte Metalloberfläche innerhalb weniger Sekunden mit Wasser reagiert. Dieser oberflächliche Korrosionsangriff als Folge der Wasserphase führt zu störenden Flecken auf der Bandoberfläche. Die durch die Bildung dieser sogenannten Wasserflecken verminderte Oberflächenqualität eines Bandes bzw. einer Folie ist für viele Anwendungszwecke ungenügend. Es ist deshalb bei Anwendung der bekannten Öl-in-Wasser-Emulsionen unbedingt erforderlich, die Emulsion unmittelbar nach dem Austritt des Bandes aus dem Walzwerk beispielsweise durch Abblasen mit Druckluft möglichst vollständig von der gewalzten Bandoberfläche zu entfernen.A major disadvantage of the oil-in-water emulsions belonging to the prior art is that the metal surface freshly produced by the rolling process reacts with water within a few seconds. This superficial corrosion attack as a result of the water phase leads to annoying spots on the belt surface. The reduced surface quality of a tape or film due to the formation of these so-called water stains is inadequate for many applications. When using the known oil-in-water emulsions, it is therefore absolutely necessary to remove the emulsion as completely as possible from the rolled strip surface immediately after the strip has left the rolling mill, for example by blowing it off with compressed air.

Aus der FR-A-2 391 261 ist es bekannt, Kaltwalzemulsionen zur Verarbeitung von Aluminium und Aluminiumlegierungen Polyole mit einer 6-C-Atom-Kette, beispielsweise Sorbitol, als Korrosionsinhibitoren beizugeben. Die Verminderung der Wasserflecken oben beschriebener Art ist damit jedoch nicht im gewünschten Masse erreichbar.From FR-A-2 391 261 it is known to add cold rolling emulsions for processing aluminum and aluminum alloys to polyols with a 6-C atom chain, for example sorbitol, as corrosion inhibitors. However, the reduction in water stains of the type described above cannot be achieved to the desired extent.

Angesichts dieser Gegebenheiten hat sich der Erfinder die Aufgabe gestellt, eine ÖI-in-Wasser-Emulsion der eingangs erwähnten Art zum Kaltwalzen von Aluminium und Aluminiumlegierungen zu schaffen, mit welcher die Bildung von Wasserflecken auf der frisch gewalzten Bandoberfläche vermindert werden kann.In view of these circumstances, the inventor has set himself the task of creating an oil-in-water emulsion of the type mentioned at the beginning for cold rolling aluminum and aluminum alloys, with which the formation of water spots on the freshly rolled strip surface can be reduced.

Die Aufgabe wird erfindungsgemäss dadurch gelöst, dass die Emulsion zusätzlich als Inhibitor gegen Wasserfleckenbildung je 0.1 bis 3 Gewichtsprozente Xylit und Sorbit enthält.According to the invention, the object is achieved in that the emulsion additionally contains 0.1 to 3 percent by weight of xylitol and sorbitol as inhibitors against water stain formation.

Durch den gemeinsamen Zusatz von Xylit und Sorbit zu einer Öl-in-Wasser-Emulsion wird die Bildung von Wasserflecken weitgehend unterbunden. Ein Entfernen der Emulsion von der Oberfläche der frisch gewalzten Bänder ist somit nicht mehr unbedingt erforderlich. Der Inhibitor ist bereits voll wirksam, wenn 1000 Gewichtsteile der Emulsion je 1 bis 30 Gewichtsteile Xylit und Sorbit enthalten.The addition of xylitol and sorbitol to an oil-in-water emulsion largely prevents the formation of water stains. It is therefore no longer absolutely necessary to remove the emulsion from the surface of the freshly rolled strips. The inhibitor is already fully effective when 1000 parts by weight of the emulsion contain 1 to 30 parts by weight of xylitol and sorbitol.

Es hat sich des weiteren herausgestellt, dass die Wirkung des aus Xylit und Sorbit zusammengesetzten Inhibitors durch die Zugabe von Glycerin noch gesteigert werden kann. Vorteilhafterweise enthalten 1000 Gewichtsteile der Emulsion 20 bis 90 Gewichtsteile Glycerin.It has further been found that the effect of the inhibitor composed of xylitol and sorbitol can be increased further by adding glycerol. Advantageously, 1000 parts by weight of the emulsion contain 20 to 90 parts by weight of glycerin.

Der Zusatz von Xylit, Sorbit und gegebenenfalls Glycerin beeinflusst den Walzvorgang nicht und führt bei einer anschliessenden Glühung der gewalzten Bänder auch nicht zu Rückständen auf der Bandoberfläche.The addition of xylitol, sorbitol and possibly glycerin does not influence the rolling process and does not lead to residues on the strip surface when the rolled strips are subsequently annealed.

Die Vorteilhaftigkeit des erfindungsgemässen Zusatzes des Inhibitors gegen Wasserfleckenbildung geht aus den Versuchen mit den nachstehend angeführten Kaltwalzemulsionen hervor.The advantageousness of the inventive addition of the water spot inhibitor is evident from the tests with the cold rolling emulsions listed below.

Emulsion 1Emulsion 1

Figure imgb0001
Figure imgb0001
Figure imgb0002
Figure imgb0002

Die organischen Komponenten wurden bei Raumtemperatur unter einfachem Rühren zusammengegeben und mit deionisiertem Wasser versetzt. Die beiden getrennten Phasen wurden anschliessend in einer Emulgiermaschine zu einer Emulsion verarbeitet.The organic components were combined at room temperature with simple stirring and deionized water was added. The two separate phases were then processed into an emulsion in an emulsifying machine.

Mit den vorstehend genannten Emulsionen wurden auf einem Einzelquartogerüst Kaltwalzversuche mit Aluminium der Reinheit AI 99,2 durchgeführt. Die Stichabnahmen betrugen teilweise bis zu 92%. An den gewalzten Aluminiumbändern konnten in keinem Fall Anzeichen von Wasserfleckenbildung beobachtet werden. Ebenso führte keine der Emulsionen bei einer anschliessenden Glühung der gewalzten Bänder zu Rückständen auf der Bandoberfläche.With the above-mentioned emulsions, cold rolling tests with aluminum of purity Al 99.2 were carried out on a single quarter stand. Some of the stitch decreases were up to 92%. In no case were there any signs of water spots on the rolled aluminum strips. Likewise, none of the emulsions caused residues on the strip surface when the rolled strips were subsequently annealed.

Claims (4)

1. Oil-in-water emulsion for the cold rolling of aluminium and aluminium alloys, with a hydrodynamic film former or reaction layer former, polyethoxylated sorbitan oleates as emulsifier, unsaturated, long-chain alkyl monocarboxylic acids as inhibitor against hydrogen embrittlement and rust formation, hexamethylenetetramine as stabiliser, fungicide and bactericide, as well as deionised water, characterised in that the emulsion additionally contains as inhibitor against water stain formation 0.1 to 3 percent by weight each of xylitol and sorbitol.
2. Emulsion according to claim 1, characterised by at least one hydrodynamic film former or reaction layer former from the group:
- polyisobutylene
- palm kernel oil
- paraffin oil
- alkyl monocarboxylic acid ester

(e.g. butyl laurate).
3. Emulsion according to claim 1 or 2, characterised in that it additionally contains glycerine.
4. Emulsion according to claim 3, characterised in that it contains 2 to 9 percent by weight of glycerine.
EP81810351A 1980-09-12 1981-08-27 Oil-in-water emulsion for the cold rolling of aluminium and its alloys Expired EP0048216B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81810351T ATE9712T1 (en) 1980-09-12 1981-08-27 OIL-IN-WATER EMULSION FOR COLD ROLLING OF ALUMINUM AND ALUMINUM ALLOYS.

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CH686380 1980-09-12
CH6863/80 1980-09-12
DE3035016A DE3035016C2 (en) 1980-09-12 1980-09-17 Oil-in-water emulsion for cold rolling light metals

Publications (2)

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EP0048216A1 EP0048216A1 (en) 1982-03-24
EP0048216B1 true EP0048216B1 (en) 1984-10-03

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JP (1) JPS5780496A (en)
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DK (1) DK150548C (en)
IE (1) IE51790B1 (en)
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Publication number Priority date Publication date Assignee Title
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Also Published As

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IE51790B1 (en) 1987-04-01
CA1161827A (en) 1984-02-07
DE3035016C2 (en) 1985-02-21
AR224704A1 (en) 1981-12-30
US4326974A (en) 1982-04-27
DK150548C (en) 1987-10-05
IE812122L (en) 1982-03-12
DK379981A (en) 1982-03-13
AU7438781A (en) 1982-03-18
DK150548B (en) 1987-03-23
JPS5780496A (en) 1982-05-20
PT73661A (en) 1981-10-01
DE3035016A1 (en) 1982-04-01
JPH0227391B2 (en) 1990-06-15
ZA815909B (en) 1982-08-25
PT73661B (en) 1983-10-20
AU543996B2 (en) 1985-05-16
EP0048216A1 (en) 1982-03-24
BR8105802A (en) 1982-05-25

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