EP0261438B1 - Schmierstoff für die spanlose Verformung von Stahl - Google Patents

Schmierstoff für die spanlose Verformung von Stahl Download PDF

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Publication number
EP0261438B1
EP0261438B1 EP87112493A EP87112493A EP0261438B1 EP 0261438 B1 EP0261438 B1 EP 0261438B1 EP 87112493 A EP87112493 A EP 87112493A EP 87112493 A EP87112493 A EP 87112493A EP 0261438 B1 EP0261438 B1 EP 0261438B1
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EP
European Patent Office
Prior art keywords
lubricant
binder
solid
styrene
thickener
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
EP87112493A
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English (en)
French (fr)
Other versions
EP0261438A3 (en
EP0261438A2 (de
Inventor
Hans-Rudolf Staub
Jacques Dr. Périard
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.)
Lonza AG
Original Assignee
Lonza AG
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Filing date
Publication date
Application filed by Lonza AG filed Critical Lonza AG
Priority to AT87112493T priority Critical patent/ATE55145T1/de
Publication of EP0261438A2 publication Critical patent/EP0261438A2/de
Publication of EP0261438A3 publication Critical patent/EP0261438A3/de
Application granted granted Critical
Publication of EP0261438B1 publication Critical patent/EP0261438B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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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    • C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
    • C10M2201/18—Ammonia
    • 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
    • C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
    • C10M2203/10—Petroleum or coal fractions, e.g. tars, solvents, bitumen
    • C—CHEMISTRY; METALLURGY
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    • 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
    • C10M2205/04—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing aromatic monomers, e.g. styrene
    • C—CHEMISTRY; METALLURGY
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    • 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
    • C10M2205/04—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing aromatic monomers, e.g. styrene
    • C10M2205/043—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing aromatic monomers, e.g. styrene used as base material
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    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
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    • C10M2205/06—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing conjugated dienes
    • C—CHEMISTRY; METALLURGY
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    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
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    • C10M2205/06—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing conjugated dienes
    • C10M2205/063—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing conjugated dienes used as base material
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    • 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
    • C10M2209/02—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M2209/04—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to an alcohol or ester thereof; bound to an aldehyde, ketonic, ether, ketal or acetal radical
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    • C10M2209/02—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M2209/06—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to an acyloxy radical of saturated carboxylic or carbonic acid
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    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
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    • C10M2209/02—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M2209/06—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to an acyloxy radical of saturated carboxylic or carbonic acid
    • C10M2209/062—Vinyl esters of saturated carboxylic or carbonic acids, e.g. vinyl acetate
    • C—CHEMISTRY; METALLURGY
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    • C10M2209/02—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M2209/08—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to a carboxyl radical, e.g. acrylate type
    • C10M2209/084—Acrylate; Methacrylate
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
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    • 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
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    • C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
    • C10M2209/12—Polysaccharides, e.g. cellulose, biopolymers
    • 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
    • C10N2040/20—Metal working
    • C10N2040/24—Metal working without essential removal of material, e.g. forming, gorging, drawing, pressing, stamping, rolling or extruding; Punching metal
    • 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
    • C10N2040/20—Metal working
    • C10N2040/241—Manufacturing joint-less pipes
    • 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
    • C10N2040/20—Metal working
    • C10N2040/242—Hot working
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
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    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/20—Metal working
    • C10N2040/243—Cold working
    • 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
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    • C10N2040/244—Metal working of specific metals
    • 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
    • C10N2040/20—Metal working
    • C10N2040/244—Metal working of specific metals
    • C10N2040/245—Soft metals, e.g. aluminum
    • 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
    • C10N2040/20—Metal working
    • C10N2040/244—Metal working of specific metals
    • C10N2040/246—Iron or steel
    • 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
    • C10N2040/20—Metal working
    • C10N2040/244—Metal working of specific metals
    • C10N2040/247—Stainless steel
    • C—CHEMISTRY; METALLURGY
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    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2050/00—Form in which the lubricant is applied to the material being lubricated
    • C10N2050/01—Emulsions, colloids, or micelles
    • 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
    • C10N2050/00—Form in which the lubricant is applied to the material being lubricated
    • C10N2050/015—Dispersions of solid lubricants
    • C10N2050/02—Dispersions of solid lubricants dissolved or suspended in a carrier which subsequently evaporates to leave a lubricant coating

Definitions

  • the invention relates to a lubricant for use in the shaping of steel at high temperatures, comprising a solid lubricant, a binder and a thickener.
  • Lubricants containing, for example, graphite, alkylene polymers or copolymers and a dispersant or film stabilizer for the non-cutting shaping of metals, in particular for lubricating the mandrel, in the manufacture of seamless tubes (DE-PS 24 50 716).
  • Lubricants of this type especially when used in so-called MPM (multiple pipe mills) lines, have to meet a multitude of requirements.
  • the lubricant must be easy to apply, which can only be achieved economically with the help of an aqueous dispersion. After removing the carrier, i.e. the water, the lubricant must remain as a waterproof, uniformly thick film, and this film must have high mechanical stability up to high temperatures and pressures with a homogeneous distribution of the solid lubricant particles.
  • Binder plays a key role in meeting these requirements.
  • a binder in DE-PS 24 50 716 u.a. called: butadiene, and also styrene and styrene with copolymers.
  • these known binders were unable to meet all the requirements that are increasingly being placed on such lubricants.
  • Butadiene as a binder was too soft, styrene, in turn, was unable to form an optimal film, even with the common copolymers.
  • Styrene-butadiene copolymers have also been described in EP-PS 0 164 637, as part of a high-temperature lubricant.
  • this formulation requires a considerable amount of an inorganic salt mixture, which in turn has adverse effects, for example in MPM streets, with regard to poor water resistance.
  • the object of the present invention is to propose a lubricant which does not have the disadvantages mentioned.
  • this is achieved with a conventional lubricant containing a carboxylated styrene-butadiene latex as a binder.
  • the binder is added to the other components of the lubricant as an aqueous dispersion with a solids content of 40 to 60% by weight.
  • the dispersant in the present case essentially water, must be added to the mixing liquid, also essentially water, to the finished lubricant dispersion.
  • composition of the lubricant expediently contains proportions of 50 to 80% by weight of a solid lubricant or solid lubricant mixture, preferably graphite, 20 to 50% by weight of the binder, calculated on its dry matter, and 0.2 to 5.0% by weight of thickener.
  • additives such as wetting agents, emulsifiers, biocides and antioxidants.
  • Their individual proportions are based on the regulations of the producer or on preliminary tests and are usually up to 2% by weight.
  • the individual components used, which produce the lubricant according to the invention, can be selected from the series of product groups mentioned below.
  • Graphite, MoS 2 (molybdenum disulfide), CaF 2 or BN can be used as the solid lubricant.
  • graphite leads to particularly good results. From the series of graphites, those with high purity, for example over 96%, and an average grain size of not more than 300 ⁇ m are preferred. The best results can be achieved with a graphite of 99.5% purity and an average grain size of 100 ⁇ m.
  • the lubricant should be present as a 10 to 60% by weight aqueous dispersion for use.
  • the dispersion expediently has a viscosity of 500 to 15000 cp at 10 to 30 ° C.
  • a thickener or a mixture of thickeners is used.
  • suitable thickeners e.g. water-soluble polysaccharides, alkyl celluloses, such as hydroxyalkyl cellulose or carboxymethyl cellulose, polyvinyl alcohols, polyacrylic acid and their derivatives, neutralized or not neutralized, natural rubbers and their derivatives (e.g. guar), polyvinyl pyrrolidone, polyethylene oxides, optionally minerals, such as clays, montmorillonite, modified montmoriton fillers, and how to call natural pitch or natural asphalt.
  • suitable thickeners e.g. water-soluble polysaccharides, alkyl celluloses, such as hydroxyalkyl cellulose or carboxymethyl cellulose, polyvinyl alcohols, polyacrylic acid and their derivatives, neutralized or not neutralized, natural rubbers and their derivatives (e.g. guar), polyvinyl pyrrolidone, polyethylene oxides, optionally minerals, such as clays,
  • the lubricant is applied in the form of an aqueous dispersion.
  • the aqueous dispersion of the lubricant can be applied to the tool, which can have temperatures from 80 to over 350 ° C.
  • the aqueous carrier of the dispersion evaporates and a film of the lubricant forms in a uniform layer thickness.
  • the film of the lubricant is in a homogeneous, waterproof form and is no longer washed or swollen by large amounts of coolant flowing over the tool.
  • the lubricant according to the invention is therefore suitable for the lubrication of tools, e.g. Mandrel, dome rod or die, when they are used to machine workpieces, e.g. blanks or pipes, in particular when hot-forming steel and rolling blanks into seamless pipes in so-called MPM lines, possibly also in continuous lines, push bench systems, bar presses or Upsetting presses.
  • tools e.g. Mandrel, dome rod or die
  • MPM lines possibly also in continuous lines, push bench systems, bar presses or Upsetting presses.
  • the desired film is formed in a thickness of 10 to 100 m ⁇ .
  • the film is waterproof, ie the subsequent cooling with water does not affect the film in any way.
  • a mandrel temperature of 150 to 250 ° C the film has good mechanical properties (e.g. a scratch hardness of 6.5 N with the Sikkens scratch hardness test).
  • the temperature resistance of the lubricant is easily guaranteed up to 350 ° C. At the same time, these values could not be achieved with the lubricants described so far, as can also be seen from the comparative examples described below.
  • Example 1 according to DE-PS 24 50 716 formulation solids content 30%, water 70%
  • Example 2 according to EP-PS 0 164 637 formulation: solids content 30%, water 70%
  • Example 3 according to the invention Formulation: solids content 45%, water 55%

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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)
  • Inorganic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Metallurgy (AREA)
  • Lubricants (AREA)

Description

  • Die Erfindung betrifft einen Schmierstoff für die Verwendung bei der Verformung von Stahl bei hohen Temperaturen, enthaltend einen Festschmierstoff, einen Binder und ein Verdickungsmittel.
  • Es ist bekannt, Schmierstoffe, enthaltend beispielsweise Graphit, Alkylenpolymerisate oder -mischpolymerisate und ein Dispergiermittel oder Filmstabilisator für die spanlose Verformung von Metallen, insbesondere zur Schmierung des Dornes, bei der Herstellung von nahtlosen Rohren einzusetzen (DE-PS 24 50 716). Derartige Schmierstoffe müssen, gerade wenn sie in sogenannten MPM (multiple pipe mills)-Strassen eingesetzt werden, einer Vielzahl von Anforderungen gerecht werden. So muss der Schmierstoff leicht auftragbar sein, was sich wirtschaftlich nur mit Hilfe einer wässrigen Dispersion bewerkstelligen lässt. Der Schmierstoff muss nach dem Entfernen des Trägers, also des Wassers als wasserfester, gleichmässig dicker Film zurück bleiben, und dieser Film muss bis zu hohen Temperaturen und Drücken eine hohe mechanische Stabilität bei homogener Verteilung der Festschmierstoffpartikel aufweisen.
  • Ein wesentlicher Anteil an der Erfüllung dieser Anforderungen liegt beim Binder. Als Binder wurden in der DE-PS 24 50 716 u.a. genannt: Butadien, und ferner Styrol und Styrol mit Copolymeren. Diese bekannten Binder vermochten aber nicht alle Anforderungen, wie sie in zunehmendem Masse an derartige Schmierstoffe gestellt werden, zu erfüllen. Butadien als Binder war zu weich, Styrol wiederum vermochte, auch nicht mit den gängigen Copolymeren, einen optimalen Film auszubilden. Styrol-Butadien-Copolymere wurden auch in der EP-PS 0 164 637 beschrieben, als Bestandteil eines Hochtemperaturschmierstoffes. Diese Formulierung benötigt aber eine erhebliche Menge eines anorganischen Salzgemisches, das wiederum nachteilige Wirkungen, beispielsweise in MPM-Strassen, bezüglich einer schlechten Wasserbeständigkeit, zeigt.
  • Aufgabe vorliegender Erfindung ist es, einen Schmierstoff vorzuschlagen, der die genannten Nachteile nicht aufweist.
  • Erfindungsgemäß wird das mit einem üblichen Schmierstoff, enthaltend als Binder einen carboxylierten Styrol-Butadienlatex, erreicht.
  • Vorzugsweise wird als Binder ein carboxylierter Styrol-Butadienlatex mit einem Styrolgehalt von mehr als 50% Styrol, vorzugsweise 70 bis 80% Styrol, eingesetzt. In der Regel wird der Binder als wässrige Dispersion mit einem Feststoffgehalt von 40 bis 60 Gew.% zu den übrigen Komponenten des Schmierstoffes zugegeben. Das Dispergiermittel, im vorliegenden Fall im wesentlichen Wasser, muss der Anmachflüssigkeit, ebenfalls im wesentlichen Wasser, der fertigen Schmierstoffdispersion zugerechnet werden.
  • Die Zusammensetzung des Schmierstoffes enthält zweckmässig Mengenanteile von 50 bis 80 Gew.% eines Festschmierstoffes oder Festschmierstoffgemisches, vorzugsweise Graphit, 20 bis 50 Gew.% des Binders, berechnet auf seine Trockenmasse, und 0,2 bis 5,0 Gew.% Verdickungsmittel.
  • Ferner kann es sich als vorteilhaft erweisen, Zusätze wie Netzmittel, Emulgatoren, Biocide und Antioxidantien der Zusammensetzung beizusetzen. Deren einzelne Mengenanteile richten sich nach den Erzeugervorschriften oder nach Vorversuchen und betragen gewöhnlich bis zu 2 Gew.%
  • Die verwendeten einzelnen Bestandteile, die den erfindungsgemässen Schmierstoff ergeben, lassen sich aus den Reihen nachfolgend genannter Produktegruppen auswählen.
  • Als Festschmierstoff können Graphit, MoS2 (Molybdändisulfid), CaF2 oder BN eingesetzt werden. Von den Festschmierstoffen führt Graphit zu besonders guten Ergebnissen. Aus der Reihe der Graphite werden solche mit hoher Reinheit, beispielsweise über 96%, und einer durchschnittlichen Korngrösse von nicht mehr als 300 um bevorzugt. Die besten Ergebnisse lassen sich mit einem Graphit von 99,5% Reinheit und einer durchschnittlichen Korngrösse von 100 µm erzielen.
  • Der Schmierstoff soll zum Gebrauch als 10 bis 60 Gew.%ige wässrige Dispersion vorliegen. Die Dispersion weist zweckmässig eine Viskosität von 500 bis 15000 cp bei 10 bis 30°C auf.
  • Um die Viskosität der Dispersion zu erreichen, wird ein Verdicker oder ein Gemisch von Verdickern angewendet. Aus der Reihe von geeigneten Verdickern sind z.B. wasserlösliche Polysaccharide, Alkylcellulosen, wie Hydroxyalkylcellulose oder Carboxymethylcellulose, Polyvinylalkohole, Polyacrylsäure und deren Derivate, neutralisiert oder nicht neutralisiert, Naturgummen und deren Derivate (z.B. Guar), Polyvinylpyrrolidon, Polyethylenoxide, gegebenenfalls Mineralien, wie Tone, Montmorillonit, modifizierter Montmorillonit, Bentonit und Füllstoffe, wie Naturpech oder Naturasphalt zu nennen.
  • Wie erwähnt, wird der Schmierstoff in Form einer wässrigen Dispersion angewendet. Die wässrige Dispersion des Schmierstoffes kann auf das Werkzeug, das Temperaturen von 80 bis über 350°C aufweisen kann, aufgetragen werden. Bei der Berührung der heissen Oberfläche verdampft der wässrige Träger der Dispersion und es bildet sich ein Film des Schmierstoffes in gleichmässiger Schichtdicke. Der Film des Schmierstoffes ist in homogener wasserfester Form und wird auch von grossen Kühlmittelmengen, die über das Werkzeug fliessen, nicht mehr abgewaschen oder angequollen.
  • Der erfindungsgemässe Schmierstoff eignet sich deshalb für die Schmierung von Werkzeug, z.B. Dorn, Domstange oder Matrize, bei deren Einsatz zur Bearbeitung von Werkstücken, beispielsweise Luppen oder Rohren, insbesondere bei der Warmverformung von Stahl und dem Walzen von Luppen zu nahtlosen Rohren in sogenannten MPM-Strassen, gegebenenfalls auch in Konti-Strassen, Stossbankanlagen, Stangenpressen oder Anstauchpressen.
  • Die Forderungen, die an den vorliegenden Schmierstoff beim Einsatz in MPM-Strassen gestellt werden, können damit vollumfänglich erfüllt werden. Bei der vorzugsweisen Anwendungs- und Verarbeitungstemperatur von 80 bis 350°C bildet sich der angestrebte Film in einer Dicke von 10 bis 100 mµ aus. Der Film ist wasserfest, d.h. die nachfolgende Kühlung mit Wasser beeinflusst den Film in keiner Weise. Bei einer Dorntemperatur von 150 bis 250°C hat der Film gute mechanische Eigenschaften (z.B. eine Ritzhärte von 6,5 N mit dem Ritzhärteprüfung nach Sikkens). Die Temperaturbeständigkeit des Schmierstoffes ist bis zu 350°C ohne weiteres gewährleistet. Diese Werte konnten mit den bisher beschriebenen Schmierstoffen gleichzeitig nicht erreicht werden, wie das auch aus den nachfolgend beschriebenen Vergleichsbeispielen ersichtlich ist.
    • Beispiel 1 nach DE-PS 24 50 716 Formulierung: Feststoffgehalt 30 %, Wasser 70 %
  • Feststoffe:
    • 74,3% Graphit
    • 23,2% SBR Latex
    • (34% Styrol, berechnet auf Feststoffgehalt des Latexes)
    • 2,0% Alkylcellulose
    • 0,5% Natriumsilicat
    • Viscosität: 3100 cps., pH = 9,2
    Beispiel 2 nach EP-PS 0 164 637 Formulierung: Feststoffgehalt 30 %, Wasser 70 %
  • Feststoffe:
    • 54,0% Graphit
    • 11,0% Polyphosphat, unlöslich
    • 5,0% Borax
    • 10,0% Natriumsilicat
    • 18,0% Polystyrol
    • 2,0% Alkylcellulose
    • Viskosität: 2000 cps., pH = 11,0
    Beispiel 3 nach der Erfindung Formulierung: Feststoffgehalt 45 %, Wasser 55 %
  • Feststoffe:
    • 74,2% Graphit
    • 24,3% SBR Latex carboxyliert
    • (75% Styrol, berechnet auf Feststoffgehalt des Latexes)
    • 1,0% Ton
    • 0,5% Antioxidant
    • Viscosität: 2800 cps., pH = 8
    • Bei den Beispielen 1 - 3 wurden die Feststoffe und das Wasser als Träger zu Dispersionen verarbeitet und zu Prüfzwecken auf metallische Oberflächen, die den Dorn darstellen, versprüht. Die Messresultate sind aus der Tabelle I ersichtlich.
      Figure imgb0001

Claims (5)

1. Schmierstoff für die Verwendung bei der spanlosen Verformung von Stahl bei hohen Temperaturen, enthaltend einen Festschmierstoff, einen Binder und ein Verdickungsmittel, dadurch gekennzeichnet, daß als Binder ein carboxylierter Styrol-Butadienlatex eingesetzt wird.
2. Schmierstoff nach Patentanspruch 1, dadurch gekennzeichnet, daß der carboxyllerte Styrol-Butadienlatex einen Styrolgehalt von mehr als 50% Styrol, vorzugsweise 70 bis 80% Styrol, enthält.
3. Schmierstoff nach Patentansprüchen 1 und/oder 2, dadurch gekennzeichnet, daß der Binder als wäßrige Dispersion mit einem Feststoffgehalt von 40 bis 60 Gew.-% zu den übrigen Komponenten des Schmierstoffes zugegeben wird.
4. Schmierstoff nach einem der Patentansprüche 1 bis 3, dadurch gekennzeichnet, daß der Schmierstoff 60 bis 80 Gew.-% Festschmierstoff,vorzugsweise Graphit, 20 bis 50 Gew.-% des Binders nach einem der Ansprüche 1 bis 3, bezogen auf seine Trockenmasse, und 0,2 bis 5,0 Gew.-% Verdickungsmittel enthält.
5. Verfahren zum Schmieren von Werkzeugen bei der spanlosen Verformung von Stahl bei hohen Temperaturen mittels eines Schmierstoffes nach einem der Patentansprüche 1 bis 4, dadurch gekennzeichnet, daß der Schmierstoff als homogene wäßrige Dispersion mit einem Feststoffgehalt von 10 bis 60 Gew.-% auf das heiße Werkzeug aufgetragen wird, wobei der wäßrige Träger der Dispersion verdampft und sich ein homogener wasserfester Schmierstoffilm mit hoher mechanischer Festigkeit ausbildet und dann die Kühlung des Werkzeugs und anschließend die spanlose Verformung eingeleitet wird.
EP87112493A 1986-09-23 1987-08-27 Schmierstoff für die spanlose Verformung von Stahl Expired - Lifetime EP0261438B1 (de)

Priority Applications (1)

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AT87112493T ATE55145T1 (de) 1986-09-23 1987-08-27 Schmierstoff fuer die spanlose verformung von stahl.

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CH3800/86 1986-09-23
CH3800/86A CH669603A5 (de) 1986-09-23 1986-09-23

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EP0261438A2 EP0261438A2 (de) 1988-03-30
EP0261438A3 EP0261438A3 (en) 1988-12-07
EP0261438B1 true EP0261438B1 (de) 1990-08-01

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CN (1) CN1011515B (de)
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JPH0747756B2 (ja) * 1989-08-09 1995-05-24 日本電装株式会社 金属の冷間塑性加工用水系潤滑処理液
DE69118601T2 (de) * 1990-07-12 1996-09-19 Daido Machinery Schmiedeschmiermittel und Verfahren zur Herstellung einer Beschichtung aus Schmiermittel auf der Oberfläche eines linearen Materials
ATE188240T1 (de) * 1992-02-06 2000-01-15 Timcal Ag Dornschmiermittel für die herstellung nahtloser rohre
AU6360596A (en) * 1995-07-04 1997-02-05 Timcal A.G. Lubricant for pass rollers
JP4996810B2 (ja) 2000-09-29 2012-08-08 ケルサン・テクノロジーズ・コーポレイション 摩擦調節組成物
US6759372B2 (en) * 2002-04-12 2004-07-06 Kelsan Technologies Corp. Friction control composition with enhanced retentivity
CN105695076B (zh) * 2016-02-26 2018-09-18 常州高特新材料有限公司 一种水性金刚线硅片切割液
RU2716499C1 (ru) * 2019-10-03 2020-03-12 Федеральное государственное бюджетное учреждение науки Ордена Трудового Красного Знамени Институт нефтехимического синтеза им. А.В. Топчиева Российской академии наук (ИНХС РАН) Способ получения биоразлагаемой низкотемпературной консистентной смазки на основе целлюлозы
CN115679195B (zh) * 2021-07-30 2023-10-17 宝山钢铁股份有限公司 一种汽车驱动轴用无缝钢管及其制造方法

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DE2048537A1 (en) * 1970-10-02 1972-04-06 Chemische Fabrik Budenheim, Rudolf A Oetker, 6501 Budenheim Lubricants for hot metal - forming - contg mixed inorganic phosphates in polymer binders
DE2318086A1 (de) * 1973-04-11 1974-10-31 Hoechst Ag Gefrier-tau-stabile polymerlatices als zusatzstoffe zu waessrigen kuehlschmiermitteln
US3873458A (en) * 1973-05-18 1975-03-25 United States Steel Corp Resin-containing lubricant coatings
GB1438215A (en) * 1974-05-08 1976-06-03 Lonz Ltd High temperature lubricant
US3925214A (en) * 1974-05-28 1975-12-09 Chemclean Corp Hot forming lubricant composition, system and method
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US4544690A (en) * 1983-07-27 1985-10-01 Reichhold Chemicals, Incorporated Aqueous rubberized coal tar emulsion

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SU1632373A3 (ru) 1991-02-28
CH669603A5 (de) 1989-03-31
DE3764052D1 (de) 1990-09-06
EP0261438A3 (en) 1988-12-07
CN1011515B (zh) 1991-02-06
AR243593A1 (es) 1993-08-31
ES2016603B3 (es) 1990-11-16
JPH0830198B2 (ja) 1996-03-27
CN87106375A (zh) 1988-04-06
ATE55145T1 (de) 1990-08-15
EP0261438A2 (de) 1988-03-30
JPS6389593A (ja) 1988-04-20

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