EP1115520B1 - Method for coating a surface with a separating agent - Google Patents

Method for coating a surface with a separating agent Download PDF

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Publication number
EP1115520B1
EP1115520B1 EP99969361A EP99969361A EP1115520B1 EP 1115520 B1 EP1115520 B1 EP 1115520B1 EP 99969361 A EP99969361 A EP 99969361A EP 99969361 A EP99969361 A EP 99969361A EP 1115520 B1 EP1115520 B1 EP 1115520B1
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EP
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Prior art keywords
powder
coating
fluidized
process according
content
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EP99969361A
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German (de)
French (fr)
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EP1115520A1 (en
Inventor
Peter Matje
Hans-Uwe Roehlinger
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Wacker Chemie AG
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Wacker Chemie AG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns

Definitions

  • the invention relates to methods for coating a Surface with a release agent.
  • soot is used to separate the press disk and Al block for use; the soot is burned an acetylene flame on an end face of the Al block deposited. This process must be carried out with every new Al block be repeated.
  • Oils are usually used to coat the press shears used, which evaporate on contact with the hot A1 and thereby achieve a separating effect.
  • pigment-free recipes are used, which are based on water or mineral oils with additives.
  • pigment-containing formulations of release agents are also used.
  • the pigments used comprise a whole range of solids such as graphite, MoS 2 , BN or talc.
  • soot as a special case is common to all previously known release agents that they in the form of liquid suspensions or emulsions must be applied. They are usually commissioned by spraying on the warm to very hot surfaces. at at high temperatures there is a risk of ignition volatile components or existing solvents or the loss of the active ingredient when suddenly evaporating in the Contact with the hot surface. In addition, the Evaporation products pose a significant burden to the Ambient air created by the formation of Decomposition products is still increased. Usually arrive a large part of the components in the water cycle, which in the Area of equipment is installed and must be at this point are elaborately eliminated.
  • the object is achieved by a method which thereby is characterized in that a BN powder by means of electrostatic Coating is applied to the surface.
  • the surface to be coated can e.g. to the Surface of the molding tool, e.g. the press washer or the baling shear act. In principle, however, it is also possible the surface of the non-ferrous metal with the ram is contacted. Since the means separation layer applied in the process according to the invention has good surface adhesion, the one with the Nonferrous metal surfaces coming into contact with the shaping press tool treated as this treatment must be repeated after 3 press cycles at the earliest.
  • BN powders are equally good for Coating are suitable. Some powders include to a high consumption, an irregular coating of the Surface, and clogging of the nozzle of the Applicator.
  • An irregular coating can lead to an uncontrollable Sticking or sticking the non-ferrous metal to the Contact point of the non-ferrous metal with the metallic Lead material.
  • BN powders are used which have a fineness corresponding to a specific surface of 10-50 m 2 / g.
  • the BN powders particularly preferably have a specific surface area of 10-30 m 2 / g, in particular a specific surface area of 10-20 m 2 / g.
  • the powder also contains boric acid and boron oxides as B203 below 5 W, particularly preferably below 0.5%.
  • the content of the various boric acids such as, for example, meta- or ortho-boric acid and of boron oxides, as is customary in the prior art, is stated as B 2 O 3 content after their analysis.
  • the moisture content of the powder is given as an H 2 O content of less than 1%, particularly preferably less than 0.2%.
  • the BN powder is fluidized in a storage container with a fluidizing gas.
  • the fluidizing gas is usually compressed air.
  • Other inert gases such as N 2 , noble gases or gas mixtures can also be used.
  • the fluidized BN powder is charged electrostatically. This happens, for example, as usual for powder coatings, in a commercial paint spraying device for powder coatings.
  • the BN particles are preferably charged with a Voltage of 75 - 80 kV worked.
  • the fluidized BN powder is loaded onto the Sprayed on and coated the surface evenly provided parts. This is done in the same way as usual Powder coating.
  • the throughput of BN powder is preferably adjusted to the values suitable for coating by the conveying gas pressure and the nozzle geometry (especially the nozzle diameter).
  • the conveying air is therefore preferably used at 0.5 - 1.5 bar, the fluidizing air at 0.3 - 0.8 bar.
  • the total air volume is about 5 - 8 m 3 / hour.
  • Handling can either be done manually - but it is a fully automated implementation of the method without further ado possible.
  • tension and the pressure regulate the order quantity and liability.
  • the invention thus also relates to the use of BN powders as a release agent in the shaping of non-ferrous metals as well a release agent consisting of BN powder.
  • a release agent consisting of BN powder.
  • BN powder Preferably acts it is the BN powder mentioned as preferred.
  • Coating is more durable than the conventional one Release coating. It enables multiple Repetition of the extrusion cycle before a new job is required.
  • the coating method according to the invention has proven to be extremely simple, quick and convenient to carry out exposed.
  • Powders suitable for use in the process according to the invention are on the market in a wide range of properties available.
  • a BN powder preferably for the Use in the method according to the invention is also suitable made from commercially available hexagonal BN powder.
  • the B 2 O 3 content of the powder is reduced by washing z. B. with water or alcohols to the desired value.
  • Moisture levels that are too high are dried, e.g. in usual drying cabinets may with protective gas or Vacuum drying reduced to that for the invention Powder to achieve necessary values.
  • the bulk density of the BN powder required according to the invention becomes if necessary, by grinding the possibly pretreated BN powder set. It is preferable to ensure that no excessive moisture absorption during grinding he follows.
  • a number of conventional "dry” grinders come as Processes such as by means of pin mills, rotor mills, Ball mills in various designs are used.
  • the simple application of the BN powder was confirmed in tests and the outstanding separation effect of BN compared to Al.
  • the use of the powders is not limited to Al; the application of BN powder according to the invention by means of electrostatic coating without any binders and free of other substances such as solvents is also for those Processing of a whole range of other non-ferrous metals such as B. Cu, Zn, Mg, Pb, Sn or their alloys are suitable.
  • the invention therefore also relates to the use of the Process according to the invention for coating surfaces extrusion of non-ferrous metals.
  • the non-ferrous metals are preferably Cu, Zn, Mg, Pb, Sn and their alloys.
  • BET surface area of 14.5 m 2 / g, a B 2 O 3 content of 0.12%, a moisture content of 0.25% H 2 O and a bulk density of 0.55 g / cm 3 (powder I) was ground in a pin mill with a throughput of 20 kg / hour.
  • the powder thus obtained (Powder II) had a spec.
  • Powder II was electrostatically coated (Fa. According to) (80 kV; 0.8 bar conveying air on the inlet side, 0.4 bar fluidizing air, 5 m 3 / hour air volume for conveying) is applied to a press disk with a diameter of 20 cm. The powder immediately settled evenly on the press disk. Approx. 0.5 g BN powder are used. A new coating was only necessary after a further three extrusion cycles.
  • a hexagonal BN powder with a fineness corresponding to a specific surface area of 6 m 2 / g and a B 2 O 3 content of 9% (powder III) with a bulk density of 0.6 g / cm 3 was ground in a ball mill a specific surface area of 15m 2 / g was reached.
  • the powder IV thus obtained was dispersed several times with water and washed out until the B 2 O 3 content was reduced to 0.1%. Finally, the powder was dried in vacuo at 60 ° C. to a residual moisture of 0.2% and ground in a rotor mill to destroy the agglomerates.
  • the consumption corresponded to the value from Example 1.
  • the coating was uniform and allowed pressure disks that came into contact with the layer to be used three times before renewed coating to form Al.

Description

Die Erfindung betrifft Verfahren zur Beschichtung einer Oberfläche mit einem Trennmittel.The invention relates to methods for coating a Surface with a release agent.

Die Probleme, die bei der Formgebung von Nichteisenmetallen auftreten, werden im Folgenden am Beispiel der Aluminiumformgebung dargelegt. Die Verarbeitung von Aluminiumblöcken zu Profilen erfolgt bei typischen Verarbeitungstemperaturen von etwa 450°C mittels Strangpressen (Extrudieren). Dabei wird ein vorgewärmter Aluminiumblock (A1-Block) mit vorzugsweisem rundem Querschnitt über einen Rezipienten (Container) mittels Preßstempel durch das formgebende Preßwerkzeug gedrückt, so zu einem Profil geformt und dann nach Verlassen abgekühlt. Der vordere Teil des Preßstempels, auch Preßscheibe genannt, muß folgende Aufgaben erfüllen:

  • 1. Er muß den Rezipienten entgegen der Preßrichtung abdichten;
  • 2. Er muß sich beim Zurückziehen des Preßstempels leicht vom Aluminium trennen.
    • Der verbleibende Al-Preßrest wird mit einem Schermesser (Preßrestschere) entfernt, bevor der nächste Al-Block zur Verarbeitung gelangt.The problems that arise when shaping non-ferrous metals are explained below using the example of aluminum shaping. Aluminum blocks are processed into profiles at typical processing temperatures of around 450 ° C by means of extrusion (extrusion). Here, a preheated aluminum block (A1 block) with a preferably round cross section is pressed over a recipient (container) by means of a press ram through the shaping press tool, thus formed into a profile and then cooled after leaving. The front part of the press ram, also called the press disk, must perform the following tasks:
  • 1. It must seal the recipient against the pressing direction;
  • 2. It must separate itself slightly from the aluminum when the plunger is pulled back.
    • The remaining Al baling residue is removed with a shear knife (baling shear) before the next Al block is processed.

    Aufgrund der überaus hohen Korrosion, die gängige metallische Werkstoffe gegenüber Aluminium und anderen Nichteisenmetallen bei typischen Verarbeitungstemperaturen zeigen, müssen Kontaktstellen zwischen Nichteisenmetall und der Form mit sogenannten Trennmitteln behandelt sein, damit ein störungsfreier Betrieb möglich ist.Due to the extremely high corrosion, the common metallic Materials compared to aluminum and other non-ferrous metals at typical processing temperatures Contact points between non-ferrous metal and the mold with so-called release agents to be treated trouble-free operation is possible.

    Als gängiges Trennmittel kommt Ruß zur Trennung von Preßscheibe und Al-Block zum Einsatz; dabei wird der Ruß durch Verbrennung einer Azetylenflamme auf einer Stirnfläche des Al-Blockes abgeschieden. Dieser Vorgang muß bei jedem neuen Al-Block wiederholt werden. As a common release agent, soot is used to separate the press disk and Al block for use; the soot is burned an acetylene flame on an end face of the Al block deposited. This process must be carried out with every new Al block be repeated.

    Zur Beschichtung der Preßrestschere werden üblicherweise Öle eingesetzt, die beim Kontakt mit dem heißen A1 verdampfen und dadurch eine Trennwirkung erreichen.Oils are usually used to coat the press shears used, which evaporate on contact with the hot A1 and thereby achieve a separating effect.

    Nicht nur beim Strangpressen sondern bei allen Verfahren zur Formgebung von Nichteisenmetallen wie z.B. Kokillenguß, Niederdruckguß, Druckguß, Strangguß werden Trennmittel eingesetzt.Not only in extrusion but in all processes for Shaping of non-ferrous metals such as permanent mold casting, Low pressure casting, die casting, continuous casting become release agents used.

    In der Regel kommen pigmentfreie Rezepturen zum Einsatz, die auf der Basis Wasser oder Mineralöle mit Zusatzstoffen aufgebaut sind. In einigen Fällen finden auch pigmenthaltige Rezepturen von Trennstoffen Verwendung. (Siehe beispielsweise EP 810046.) Die eingesetzten Pigmente umfassen eine ganze Reihe von Feststoffen wie z.B. Graphit, MoS2, BN oder Talkum.As a rule, pigment-free recipes are used, which are based on water or mineral oils with additives. In some cases, pigment-containing formulations of release agents are also used. (See, for example, EP 810046.) The pigments used comprise a whole range of solids such as graphite, MoS 2 , BN or talc.

    Sieht man von der o.a. in situ Bildung von Ruß als Sonderfall ab, so ist allen bislang bekannten Trennmitteln gemeinsam, daß sie in Form von flüssigen Suspensionen oder Emulsionen angewendet werden müssen. Üblicherweise erfolgt deren Auftrag durch Aufsprühen auf die warmen bis sehr heißen Flächen. Bei hohen Temperaturen besteht dabei die Gefahr der Entzündung leicht flüchtiger Komponenten oder vorhandener Lösemittel oder des Verlusts des Wirkstoffs beim plötzlichen Verdampfen im Kontakt mit der heißen Oberfläche. Darüber hinaus stellen die Verdampfungsprodukte eine erhebliche Belastung für die Umgebungsluft dar, die durch die Entstehung von Zersetzungsprodukten noch erhöht wird. In aller Regel gelangen ein großer Teil der Komponenten in den Wasserkreislauf, der im Bereich der Anlagen installiert ist und müssen an dieser Stelle aufwendig beseitigt werden.If you see from the above in situ formation of soot as a special case is common to all previously known release agents that they in the form of liquid suspensions or emulsions must be applied. They are usually commissioned by spraying on the warm to very hot surfaces. at at high temperatures there is a risk of ignition volatile components or existing solvents or the loss of the active ingredient when suddenly evaporating in the Contact with the hot surface. In addition, the Evaporation products pose a significant burden to the Ambient air created by the formation of Decomposition products is still increased. Usually arrive a large part of the components in the water cycle, which in the Area of equipment is installed and must be at this point are elaborately eliminated.

    Es stellt sich somit die Aufgabe, ein Verfahren zur Beschichtung einer Oberfläche mit einem Trennmittel zur Verfügung zu stellen, das nicht mit den genannten Problemen des Standes der Technik behaftet ist. Dabei soll die Beschichtung gleichmäßig, schnell und sparsam erfolgen. It is therefore the task of a process for Coating a surface with a release agent To make available that is not with the problems of the State of the art is affected. The coating should done evenly, quickly and economically.

    Die Aufgabe wird gelöst durch ein Verfahren, das dadurch gekennzeichnet ist, daß ein BN-Pulver mittels elektrostatischer Beschichtung auf die Oberfläche aufgebracht wird.The object is achieved by a method which thereby is characterized in that a BN powder by means of electrostatic Coating is applied to the surface.

    Bei der zu beschichtenden Oberfläche kann es sich z.B. um die Oberfläche des formgebenden Preßwerkzeugs, z.B. der Preßscheibe oder der Preßrestschere, handeln. Prinzipiell ist es jedoch ebenso möglich, die Oberfläche des Nichteisenmetalls, die mit dem Preßstempel kontaktiert wird, zu behandeln. Da die mittels des erfindungsgemäßen Verfahrens aufgetragene Trennschicht eine gute Oberflächenhaftung besitzt, wird vorzugsweise die mit dem Nichteisenmetall in Kontakt kommenden Oberflächen des formgebenden Preßwerkzeugs behandelt, da diese Behandlung frühestens nach 3 Preßzyklen wiederholt werden muß.The surface to be coated can e.g. to the Surface of the molding tool, e.g. the press washer or the baling shear act. In principle, however, it is also possible the surface of the non-ferrous metal with the ram is contacted. Since the means separation layer applied in the process according to the invention has good surface adhesion, the one with the Nonferrous metal surfaces coming into contact with the shaping press tool treated as this treatment must be repeated after 3 press cycles at the earliest.

    Es zeigte sich, daß nicht alle BN-Pulver gleichermaßen gut zur Beschichtung geeignet sind. Manche Pulver führen u.a. zu einem hohen Verbrauch, einer unregelmäßigen Beschichtung der Oberfläche, und einem Verstopfen der Düse der Auftragvorrichtung.It was found that not all BN powders are equally good for Coating are suitable. Some powders include to a high consumption, an irregular coating of the Surface, and clogging of the nozzle of the Applicator.

    Eine unregelmäßige Beschichtung kann zu einem unkontrollierbaren Kleben oder Anhaften des Nichteisenmetalls an der Kontaktstelle des Nichteisenmetalls mit dem metallischen Werkstoff führen.An irregular coating can lead to an uncontrollable Sticking or sticking the non-ferrous metal to the Contact point of the non-ferrous metal with the metallic Lead material.

    Es werden BN-Pulver eingesetzt, die eine Feinheit entsprechend einer spezifischen Oberfläche von 10-50 m2/g haben. Besonders bevorzugt haben die BN-Pulver eine spezifische Oberfläche von 10-30 m2/g, insbesondere eine spezifische Oberfläche von 10-20 m2/g.BN powders are used which have a fineness corresponding to a specific surface of 10-50 m 2 / g. The BN powders particularly preferably have a specific surface area of 10-30 m 2 / g, in particular a specific surface area of 10-20 m 2 / g.

    Das Pulver besitzt ferner einen Gehalt an Borsäure und Boroxiden angegeben als B203 unter 5 W besonders bevorzugt unter 0,5 %. Der Gehalt an den verschiedenen Borsäuren wie z.B. meta-, oder ortho- Borsäure und an Boroxiden wird dabei, wie im Stand der Technik üblich, nach ihrer Analyse als B2O3 Gehalt angegeben. The powder also contains boric acid and boron oxides as B203 below 5 W, particularly preferably below 0.5%. The content of the various boric acids such as, for example, meta- or ortho-boric acid and of boron oxides, as is customary in the prior art, is stated as B 2 O 3 content after their analysis.

    Der Feuchtegehalt des Pulvers ist angegeben als H2O Gehalt kleiner 1 %, besonders bevorzugt kleiner 0,2 %.The moisture content of the powder is given as an H 2 O content of less than 1%, particularly preferably less than 0.2%.

    Es werden Pulver deren Schüttdichte unter 0,5 g/cm3, insbesondere unter 0,3 g/cm3 liegt, eingesetzt.Powders with a bulk density below 0.5 g / cm 3 , in particular below 0.3 g / cm 3 , are used.

    Zur Durchführung des erfindungsgemäßen Verfahrens wird das BN-Pulver in einem Vorlagebehälter mit einem Fluidisiergas fluidisiert. Das Fluidisiergas ist üblicherweise Preßluft. Andere inerte Gase wie z.B. N2, Edelgase oder auch Gasgemische können ebenso verwendet werden.To carry out the method according to the invention, the BN powder is fluidized in a storage container with a fluidizing gas. The fluidizing gas is usually compressed air. Other inert gases such as N 2 , noble gases or gas mixtures can also be used.

    Das fluidisierte BN-Pulver wird elektrostatisch aufgeladen. Dies geschieht beispielsweise, wie für Pulverlacke üblich, in einer handelsüblichen Farbspritzvorrichtung für Pulverlacke. Zur Aufladung der BN-Partikel wird vorzugsweise mit einer Spannung von 75 - 80 kV gearbeitet.The fluidized BN powder is charged electrostatically. This happens, for example, as usual for powder coatings, in a commercial paint spraying device for powder coatings. The BN particles are preferably charged with a Voltage of 75 - 80 kV worked.

    Das fluidisierte BN-Pulver wird im geladenen Zustand auf die Oberfläche aufgesprüht und beschichtet gleichmäßig die vorgesehenen Teile. Dies geschieht analog einer üblichen Pulverbeschichtung.The fluidized BN powder is loaded onto the Sprayed on and coated the surface evenly provided parts. This is done in the same way as usual Powder coating.

    Vorzugsweise wird der Durchsatz an BN-Pulver durch den Fördergasdruck und die Düsengeometrie (vor allem den Düsendurchmesser) auf die jeweils zur Beschichtung geeigneten Werte eingestellt. Die Förderluft wird daher vorzugsweise mit 0,5 - 1,5 bar eingesetzt, die Fluidisierluft mit 0,3 - 0,8 bar. Die Gesamtluftmenge beträgt etwa 5 - 8 m3/Std.The throughput of BN powder is preferably adjusted to the values suitable for coating by the conveying gas pressure and the nozzle geometry (especially the nozzle diameter). The conveying air is therefore preferably used at 0.5 - 1.5 bar, the fluidizing air at 0.3 - 0.8 bar. The total air volume is about 5 - 8 m 3 / hour.

    Die Handhabung kann entweder manuell erfolgen - es ist jedoch ohne weiteres eine vollautomatische Durchführung des Verfahrens möglich. Durch Variation der Spannung und des Drucks läßt sich die Auftragsmenge und die Haftung regeln. Es hat sich überraschenderweise gezeigt, daß die mittels des erfindungsgemäßen Verfahrens aufgebrachten BN-Pulver eine ausreichend hohe Haftung an dem zu beschichtenden Medium (z.B. einer Preßscheibe) haben, ohne daß ein Zusatz von Bindemitteln nötig ist.Handling can either be done manually - but it is a fully automated implementation of the method without further ado possible. By varying the tension and the pressure regulate the order quantity and liability. It has surprisingly been found that the means of BN powder applied a method according to the invention sufficiently high adhesion to the medium to be coated (e.g. a press washer) without the addition of binders is necessary.

    Die Erfindung betrifft somit auch die Verwendung von BN-Pulvern als Trennmittel bei der Formgebung von Nichteisenmetallen sowie ein Trennmittel bestehend aus BN-Pulver. Vorzugsweise handelt es sich dabei um die als bevorzugt genannten BN-Pulver.The invention thus also relates to the use of BN powders as a release agent in the shaping of non-ferrous metals as well a release agent consisting of BN powder. Preferably acts it is the BN powder mentioned as preferred.

    Die mittels des erfindungsgemäßen Verfahrens erfolgte Beschichtung ist langlebiger als die herkömmliche Trennmittelbeschichtung. Sie ermöglicht eine mehrfache Wiederholung des Strangpreßzyklus, bevor ein erneuter Auftrag erforderlich wird.That was done by means of the method according to the invention Coating is more durable than the conventional one Release coating. It enables multiple Repetition of the extrusion cycle before a new job is required.

    Es zeigt sich, daß die Beschichtung ebenfalls an Ecken und Kanten erfolgt und darüberhinaus um diese herum verläuft.It turns out that the coating also at corners and Edges occur and also runs around them.

    Das erfindungsgemäße Beschichtungsverfahren hat sich als außerordentlich einfach, schnell und bequem in der Durchführung herausgestellt.The coating method according to the invention has proven to be extremely simple, quick and convenient to carry out exposed.

    Zum Einsatz im erfindungsgemäßen Verfahren geeignete Pulver sind in einem breiten Spektrum an Eigenschaften am Markt erhältlich.Powders suitable for use in the process according to the invention are on the market in a wide range of properties available.

    Die Herstellung eines BN-Pulvers, das vorzugsweise für den Einsatz im erfindungsgemäßen Verfahren geeignet ist, kann auch aus handelsüblichem hexagonalen BN-Pulver erfolgen.The production of a BN powder, preferably for the Use in the method according to the invention is also suitable made from commercially available hexagonal BN powder.

    Sollte der Gehalt der herkömmlichen Pulver an Borsäuren und B2O3 zu hoch liegen, so wird der B2O3 Gehalt des Pulvers durch Waschen z. B. mit Wasser oder auch Alkoholen auf den gewünschten Wert eingestellt. If the boric acid and B 2 O 3 content of the conventional powder is too high, the B 2 O 3 content of the powder is reduced by washing z. B. with water or alcohols to the desired value.

    Zu hohe Feuchtegehalte werden mittels Trocknung z.B. in üblichen Trockenschränken u.U. mit Schutzgas oder Vakuumtrocknung vermindert, um die für das erfindungsgemäße Pulver notwendigen Werte zu erreichen.Moisture levels that are too high are dried, e.g. in usual drying cabinets may with protective gas or Vacuum drying reduced to that for the invention Powder to achieve necessary values.

    Die erfindungsgemäß notwendige Schüttdichte des BN-Pulvers wird ggf. durch Mahlung der evtl. vorbehandelten BN-Pulver eingestellt. Dabei ist vorzugsweise darauf zu achten, daß während der Mahlung keine zu starke Feuchtigkeitsaufnahme erfolgt.The bulk density of the BN powder required according to the invention becomes if necessary, by grinding the possibly pretreated BN powder set. It is preferable to ensure that no excessive moisture absorption during grinding he follows.

    Als Mahlaggregate kommen eine Reihe üblicher "trockener" Verfahren wie z.B. mittels Stiftmühlen, Rotormühlen, Kugelmühlen in verschiedenen Ausführungsformen zum Einsatz.A number of conventional "dry" grinders come as Processes such as by means of pin mills, rotor mills, Ball mills in various designs are used.

    In Versuchen bestätigte sich die einfache Aufbringung des BN-Pulvers und die überragende Trennwirkung von BN gegenüber Al. Die Verwendung der Pulver ist nicht auf Al beschränkt; das erfindungsgemäße Auftragen von BN-Pulver mittels elektrostatischer Beschichtung ohne jegliche Bindemittel und frei von sonstigen Stoffen wie Lösemitteln ist auch für die Verarbeitung einer ganzen Reihe von anderen Nichteisenmetallen wie z. B. Cu, Zn, Mg, Pb, Sn oder deren Legierungen geeignet.The simple application of the BN powder was confirmed in tests and the outstanding separation effect of BN compared to Al. The use of the powders is not limited to Al; the application of BN powder according to the invention by means of electrostatic coating without any binders and free of other substances such as solvents is also for those Processing of a whole range of other non-ferrous metals such as B. Cu, Zn, Mg, Pb, Sn or their alloys are suitable.

    Die Erfindung betrifft daher auch die Verwendung des erfindungsgemäßen Verfahrens zur Beschichtung von Oberflächen beim Strangpressen von Nichteisenmetallen.The invention therefore also relates to the use of the Process according to the invention for coating surfaces extrusion of non-ferrous metals.

    Vorzugsweise handelt es sich bei den Nichteisenmetallen um Cu, Zn, Mg, Pb, Sn und deren Legierungen.The non-ferrous metals are preferably Cu, Zn, Mg, Pb, Sn and their alloys.

    Die folgenden Beispiele dienen zur weiteren Beschreibung der Erfindung: The following examples serve to further describe the Invention:

    Beispiel 1:Example 1:

    Ein unter der Bezeichnung S1 bei Elektroschmelzwerk Kempten GmbH, München käuflich erhältliches BN-Pulver mit einer Feinheit entsprechend einer spez. Oberfläche nach BET von 14,5 m2/g, einem B2O3-Gehalt von 0,12 %, einer Feuchte von 0,25 % H2O und einer Schüttdichte von 0,55 g/cm3 (Pulver I) wurde in einer Stiftmühle mit 20 kg/Stunde Durchsatz gemahlen. Das so erhaltene Pulver (Pulver II) hatte eine spez. Oberfläche nach BET von 14,5 m2/g, einen B2O3-Gehalt von 0,2 %, eine Feuchte von 0,3 % und eine Schüttdichte von 0,2 g/cm3.A BN powder commercially available under the designation S1 from Elektroschmelzwerk Kempten GmbH, Munich, with a fineness corresponding to a spec. BET surface area of 14.5 m 2 / g, a B 2 O 3 content of 0.12%, a moisture content of 0.25% H 2 O and a bulk density of 0.55 g / cm 3 (powder I) was ground in a pin mill with a throughput of 20 kg / hour. The powder thus obtained (Powder II) had a spec. BET surface area of 14.5 m 2 / g, a B 2 O 3 content of 0.2%, a moisture content of 0.3% and a bulk density of 0.2 g / cm 3 .

    Pulver II wurde mittels elektrostatischer Beschichtung (Fa.
    Gema), (80 kV; 0,8 bar Förderluft eingangsseitig, 0,4 bar Fluidisierungsluft, 5 m3/Std. Luftmenge zum Fördern) auf eine Preßscheibe eines Durchmessers von 20 cm aufgebracht. Das Pulver schlug sich augenblicklich gleichmäßig auf der Preßscheibe nieder. Es werden ca. 0,5 g BN-Pulver verbraucht. Erst nach weiteren drei Strangpreßzyklen war eine erneute Beschichtung erforderlich.    Powder II was electrostatically coated (Fa.
    According to) (80 kV; 0.8 bar conveying air on the inlet side, 0.4 bar fluidizing air, 5 m 3 / hour air volume for conveying) is applied to a press disk with a diameter of 20 cm. The powder immediately settled evenly on the press disk. Approx. 0.5 g BN powder are used. A new coating was only necessary after a further three extrusion cycles.

    Beispiel 2:Example 2:

    Ein hexagonales BN-Pulver mit einer Feinheit entsprechend einer spezifischen Oberfläche von 6 m2/g und einem B2O3-Gehalt von 9 % (Pulver III) mit einer Schüttdichte zu 0,6 g/cm3 wurde in einer Kugelmühle gemahlen bis eine spezifische Oberfläche von 15m2/g erreicht war. Das so erhaltene Pulver IV wurde mehrfach mit Wasser dispergiert und ausgewaschen, bis der B2O3 Gehalt auf 0,1 % reduziert war. Abschließend wurde das Pulver im Vakuum bei 60 °C bis zu einer Restfeuchte von 0,2 % getrocknet und in einer Rotormühle zur Zerstörung der Agglomerate gemahlen. Mit dem so erhaltenen Pulver V (Schüttdichte 0,19 g/cm3, übrige Parameter wie genannt) wurde ein Al-Block, wie in Beispiel 1 beschrieben, elektrostatisch beschichtet. Der Verbrauch entsprach dem Wert aus Beispiel 1. Die Beschichtung war gleichmäßig und erlaubte mit der Schicht in Kontakt gekommene Preßscheiben dreimal vor einer erneuten Beschichtung zur Formgebung von Al einzusetzen.A hexagonal BN powder with a fineness corresponding to a specific surface area of 6 m 2 / g and a B 2 O 3 content of 9% (powder III) with a bulk density of 0.6 g / cm 3 was ground in a ball mill a specific surface area of 15m 2 / g was reached. The powder IV thus obtained was dispersed several times with water and washed out until the B 2 O 3 content was reduced to 0.1%. Finally, the powder was dried in vacuo at 60 ° C. to a residual moisture of 0.2% and ground in a rotor mill to destroy the agglomerates. An Al block, as described in Example 1, was electrostatically coated with the powder V thus obtained (bulk density 0.19 g / cm 3 , other parameters as mentioned). The consumption corresponded to the value from Example 1. The coating was uniform and allowed pressure disks that came into contact with the layer to be used three times before renewed coating to form Al.

    Claims (4)

    1. Process for coating a surface during extrusion with a parting agent, characterized in that a BN powder which has a fineness which corresponds to a specific surface area of 10-50 m2/g and contains less than 5% of boric acid or boron oxides, indicated as B2O3, and has a moisture content, indicated as H2O content, of less than 1% and a bulk density of less than 0.5 g/cm3 is fluidized in a storage container by means of a fluidizing gas, the fluidized BN powder is electrostatically charged, and the fluidized BN powder is sprayed onto the surface to be coated in the charged state.
    2. Process according to Claim 1, characterized in that the BN particles are charged with a voltage of 75-80 kV.
    3. Process according to Claim 1, characterized in that the fluidizing gas is compressed air or an inert gas.
    4. Process according to Claim 1, characterized in that the coating is carried out with a delivery-air pressure of 0.5-1.5 bar, a fluidizing air of 0.3-0.8 bar and a total air volume of approximately 5-8 m3/h.
    EP99969361A 1998-09-17 1999-09-16 Method for coating a surface with a separating agent Expired - Lifetime EP1115520B1 (en)

    Applications Claiming Priority (3)

    Application Number Priority Date Filing Date Title
    DE19842660A DE19842660A1 (en) 1998-09-17 1998-09-17 Process for coating a surface with a release agent
    DE19842660 1998-09-17
    PCT/EP1999/006850 WO2000016931A1 (en) 1998-09-17 1999-09-16 Method for coating a surface with a separating agent

    Publications (2)

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    EP1115520A1 EP1115520A1 (en) 2001-07-18
    EP1115520B1 true EP1115520B1 (en) 2002-06-19

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    JP (1) JP2002526265A (en)
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    BR (1) BR9913865A (en)
    CA (1) CA2345922A1 (en)
    DE (2) DE19842660A1 (en)
    ES (1) ES2179700T3 (en)
    PL (1) PL347358A1 (en)
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    DE19945461A1 (en) * 1999-09-22 2001-04-19 Linde Gas Ag Process for improving the magnesium die casting process
    DE10326769B3 (en) * 2003-06-13 2004-11-11 Esk Ceramics Gmbh & Co. Kg Slip for producing long-lasting mold release layer, useful on mold for casting nonferrous metal under pressure, comprises boron nitride suspension in silanized silica in organic solvent or aqueous colloidal zirconia, alumina or boehmite
    DE102005021688A1 (en) * 2005-05-11 2006-11-16 Volkswagen Ag Application of separating material in gravity ingot pouring involves vapor depositing separating material on inner region of mold or suspension can be used as separating material
    DE102005042475A1 (en) 2005-09-07 2007-03-08 Ks Aluminium-Technologie Ag Mold release layer for casting non-ferrous metals
    DE102006010876A1 (en) 2006-03-07 2007-09-13 Ks Aluminium-Technologie Ag Mold release layer for casting non-ferrous metals
    PL2087953T3 (en) * 2007-03-28 2020-06-01 Aoki Science Institute Co., Ltd. Oil-based mold release agent for die casting and use thereof by electrostatic spraying
    JP4452310B2 (en) * 2008-06-13 2010-04-21 新日本製鐵株式会社 Casting method and casting mold of iron-based alloy in semi-molten or semi-solid state
    JP5563947B2 (en) * 2010-10-04 2014-07-30 昭和電工株式会社 Extrusion processing method and extrusion processing apparatus
    TWI505881B (en) * 2012-07-18 2015-11-01 Min Chi University Of Technology Method for improving the mold release effect of a metal casting mold
    CL2014000872A1 (en) 2014-04-08 2014-08-22 Asesorias Y Servicios Innovaxxion Spa Process for the formation of copper anodes in a molding wheel since the copper is in the molten liquid state in a tilting gutter and is transferred to a spoon, because it comprises the steps of pouring molten liquid copper from a tilt distribution channel to a spoon , connect the metal components of the spoon, throw an air jet towards the lip of the spoon, connect the metal components.
    DE102014218449A1 (en) 2014-09-15 2016-03-17 Schunk Kohlenstofftechnik Gmbh Mold and method of manufacture
    CN109465163A (en) * 2018-12-28 2019-03-15 深圳市银宝山新科技股份有限公司 High solid phase semisolid workpiece surface spraying method
    CN110614291A (en) * 2019-10-24 2019-12-27 亚太轻合金(南通)科技有限公司 Method and device for separating hot-extruded aluminum bar from extrusion rod conveniently
    KR102639387B1 (en) * 2021-07-20 2024-02-23 동국제강 주식회사 Releasing agent for separating titanium alloy thin plates after hot rolling of pack slab stacked with multiple titanium slabs, releasing agent application apparatus for slab and method for applying releasing agent for slab using the same

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    US5437326A (en) * 1992-08-18 1995-08-01 Hazelett Strip-Casting Corporation Method and apparatus for continuous casting of metal

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    WO2000016931A1 (en) 2000-03-30
    EP1115520A1 (en) 2001-07-18
    BR9913865A (en) 2001-06-05
    PL347358A1 (en) 2002-04-08
    JP2002526265A (en) 2002-08-20
    DE59901823D1 (en) 2002-07-25
    ES2179700T3 (en) 2003-01-16
    CA2345922A1 (en) 2000-03-30
    DE19842660A1 (en) 2000-03-30
    CN1318000A (en) 2001-10-17
    TW475909B (en) 2002-02-11

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