EP1242193A2 - Method for producing coated metal surfaces and the use of said metal surfaces - Google Patents

Method for producing coated metal surfaces and the use of said metal surfaces

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Publication number
EP1242193A2
EP1242193A2 EP00983330A EP00983330A EP1242193A2 EP 1242193 A2 EP1242193 A2 EP 1242193A2 EP 00983330 A EP00983330 A EP 00983330A EP 00983330 A EP00983330 A EP 00983330A EP 1242193 A2 EP1242193 A2 EP 1242193A2
Authority
EP
European Patent Office
Prior art keywords
coating
pretreatment agent
layer
pretreatment
powder
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.)
Granted
Application number
EP00983330A
Other languages
German (de)
French (fr)
Other versions
EP1242193B1 (en
Inventor
Heribert Domes
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.)
Chemetall GmbH
Original Assignee
Chemetall GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Chemetall GmbH filed Critical Chemetall GmbH
Publication of EP1242193A2 publication Critical patent/EP1242193A2/en
Application granted granted Critical
Publication of EP1242193B1 publication Critical patent/EP1242193B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/50—Multilayers
    • B05D7/52—Two layers
    • B05D7/54—No clear coat specified
    • B05D7/544—No clear coat specified the first layer is let to dry at least partially before applying the second layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/10—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by other chemical means
    • B05D3/102—Pretreatment of metallic substrates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions

Definitions

  • the invention relates to a method for producing coated metal surfaces, in which the coating can be carried out at high speed.
  • Such coatings are used today under the term "coil coating” for coating tapes.
  • the known high-speed coating processes have the disadvantage that the pretreatment and the primer are applied in two separate steps.
  • the object of the invention is to propose a process for the large-scale production of lacquered tapes, in which the pretreatment and priming can be applied in a single operation.
  • the object is achieved by a process for the production of coated metal surfaces at a coating speed of at least 25 m per minute when a pretreatment agent is applied to a cleaned or / and pickled metal surface, which is characterized in that on at least one surface of a metallic body according to a Cleaning or / and pickling the metallic surface to be treated, at least one pretreatment agent, in particular a solution and / or dispersion, is applied and then at least one layer of varnish is applied to part of the pretreated surface, with only one pretreatment agent and not one Paint produced coating is used as a treatment layer instead of a pretreatment and a primer layer.
  • a pretreatment agent in particular a solution and / or dispersion
  • the object is achieved by a method for producing coated metal surfaces at a coating speed of at least 25 m per minute when applying a pretreatment agent to a cleaned or / and pickled metal surface, which is characterized in that at least one pretreatment agent, in particular, on at least one surface of a metallic body after cleaning and / or pickling the metal surface to be treated a solution or / and dispersion is applied and then at least one lacquer layer is applied to at least part of the pretreated surface, the coating treated with a pretreatment agent being used as a treatment layer instead of a pretreatment and a primer layer and.
  • the pretreated surface or the pretreated surfaces will preferably be one side of a band, on which at least one of the narrow edge surfaces of the band may also have been partially pretreated.
  • the coating speed is preferably 40 to 600 m per minute, particularly preferably 75 to 160 m per minute.
  • the treatment layer takes over the functions of the primer.
  • the other part of the pretreated surface is no longer coated with a varnish on the coil coating system.
  • the method according to the invention can be used in such a way that moisture or residual moisture in the applied pretreatment layer is retained until it is coated in order to adjust the electrical conductivity of the pretreated surface which is necessary for the application of the coating layer.
  • the metal surface can contain in particular aluminum, iron, copper, magnesium, zinc and / or tin and can preferably be made of an aluminum alloy, a hot-dip galvanized or electrolytically galvanized iron material, a steel, a solid zinc material in the form of strips or sheets or one Tinplate exist.
  • the bodies can be flat or deformed, without or with recesses such as a perforated structure his.
  • the recesses of a perforated plate can all have the same or, if appropriate, also different geometries and sizes: for example circular holes, elongated holes, slots.
  • the cleaning or / and pickling of the metallic surface can be done by spraying or / and brushing with a cleaning or pickling solution or dipping into a bath of this solution.
  • the pretreatment of the cleaned or / and pickled surface can be carried out by spraying and squeezing e.g. with a roller, by spraying and blowing off e.g. with compressed air, by dipping and squeezing e.g. with a roller, by dipping and blowing off e.g. with compressed air or in the roll-coat process.
  • the treatment liquid is applied with a coating roller in or against the direction of the belt.
  • no subsequent rinsing is carried out in order to avoid erosion or damage to the applied layer and to avoid rinsing water contaminated with chemicals, which have to be post-treated for environmental reasons.
  • the pretreatment agent can be a preparation which contains a polymer dispersion with at least one resin from the group consisting of acrylate, epoxy, phenol, polyester, silicone polyester, polyurethane, styrene and resin based on urea-formaldehyde or a mixture thereof and / or a copolymer.
  • the preparation contains a non-volatile film-forming mixture.
  • the preparation can contain at least one resin as a solution and / or as a dispersion.
  • the preparation can contain at least one inorganic additive in dissolved form and / or as a finely divided powder, e.g. contain a carbonate, chromate, oxide, phosphate, silicate, sulfate.
  • the pretreatment agent can also be a resin-free preparation, the preparation being aluminum, fluoride, hydrofluoric acid, phosphate, phosphoric acid, three- or / and hexavalent chromate, chromic acid, silicate, silane, tannin, titanium, zinc, zirconium and / or self-organizing molecules, for example based on phosphonates, carboxylic acids, thiols and / or silanes.
  • a different pretreatment agent can be selected for one side of the tape than for the other side, wherein the side not intended for subsequent painting can be coated with a pretreatment agent containing organic resin.
  • a pretreatment agent containing organic resin e.g. only one side of a volume - e.g. the top - painted, while on the opposite side the pre-treatment acts as a finishing treatment.
  • the layer can either be partially dried or thoroughly dried. This can be implemented - in particular with the same belt speed and when using existing ovens - by a shorter dwell time under the active drying conditions, by a lower temperature in the oven or / and by less air movement for drying the belt.
  • At least one side of the pretreated surface is preferably coated with an organic coating which hardens or crosslinks sufficiently in a time of 1 second to 3 minutes, particularly preferably in a time of 5 seconds to 2 minutes.
  • a powder coating is preferably applied and baked, in particular a powder coating with good mechanical properties, high scratch resistance, good adhesion and high flexibility with regard to the forming.
  • the powder coating can be applied or burned in by spraying, fluidized bed sintering and / or powder cloud technology. Powder cloud technology is described, inter alia, in EP-A-0 678 466.
  • the stoving can be used instead of conventional forced air drying or floating forced air drying in particular by conductive drying in the case of magnetic materials or by infrared drying, in particular in the near infrared (NIR).
  • the pretreatment or treatment layer can have a layer thickness in the range from 0.1 to 50 ⁇ m, preferably in the range from 0.5 to 10 ⁇ m, very particularly preferably in the range from 1 to 3 ⁇ m.
  • the baked lacquer layer which is located on the pretreatment layer, can have a layer thickness after crosslinking in the range from 5 to 1000 ⁇ m, preferably in the range from 10 to 400 ⁇ m, very particularly preferably in the range from 15 to 60 ⁇ m.
  • a layer thickness in the range of 100 to 300 ⁇ m.
  • a single-layer topcoat is applied as the only lacquer to the strip to be coated.
  • a treatment layer can be formed with the pretreatment agent, which takes on the function of a pretreatment and at the same time a primer.
  • the primer takes on the function of corrosion protection, adhesion and flexibility, but not to a greater extent also an aesthetic function.
  • a powder for a monochrome unstructured coating, a powder for a multicolored unstructured coating or / and a powder for a multicolored structured coating can be used in the powder coating.
  • the coated surface can be at least partially protected by a film or adhesive film, in particular against mechanical impairment, for example during storage, transport and further processing.
  • the coated bodies can optionally be deformed, cut - in particular cut lengthways and / or in the transverse direction - and optionally deformed again, such as, for example, flared, roll-formed, deep-drawn and / or folded.
  • the products produced by the process according to the invention can be used as inner and outer cladding, device cladding e.g. for household appliances and small electrical appliances, in particular with decorated outer cladding, perforated plates, in particular for loudspeakers and soundproofing linings, room dividers, partitions, furniture elements, shelves, vehicle and aircraft interior linings such as Dashboards, frames and frame constructions, facings, lighting fixtures are used.
  • device cladding e.g. for household appliances and small electrical appliances, in particular with decorated outer cladding, perforated plates, in particular for loudspeakers and soundproofing linings, room dividers, partitions, furniture elements, shelves, vehicle and aircraft interior linings such as Dashboards, frames and frame constructions, facings, lighting fixtures are used.

Abstract

The invention relates to a method for producing coated metal surfaces at a coating speed of at least 25 m per minute during the application of a pre-treating agent to a cleaned and/or pickled metal surface. The inventive method is characterized by applying at least one pre-treating agent to at least one surface of a metal body after cleaning and/or pickling the metal surface to be treated. At least one lacquer layer is applied to a part of the pre-treated surface, the coating produced only by the pre-treating agent and not by the lacquer being used as the treatment layer instead of a priming or pre-treatment layer. The invention further relates to a method for producing coated metal surfaces at a coating speed of at least 25 m per minute during the application of a pre-treating agent to a cleaned and/or pickled metal surface. The inventive method is characterized by applying at least one pre-treating agent to at least one surface of a metal body after cleaning and/or pickling the metal surface to be treated. At least one lacquer layer is applied to at least a part of the pre-treated surface, the coating produced only by the pre-treating agent being used as the treatment layer instead of a priming or pre-treatment layer.

Description

Verfahren zur Herstellung von beschichteten Metalloberflächen und deren Process for the production of coated metal surfaces and their
Verwendunguse
Die Erfindung betrifft ein Verfahren zur Herstellung von beschichteten Metalloberflächen, bei dem die Beschichtung mit hoher Geschwindigkeit erfolgen kann. Derartige Beschichtungen werden heute unter dem Begriff "coil coating" zur Beschichtung von Bändern genutzt.The invention relates to a method for producing coated metal surfaces, in which the coating can be carried out at high speed. Such coatings are used today under the term "coil coating" for coating tapes.
Die bekannten Beschichtungsverfahren hoher Geschwindigkeit weisen den Nachteil auf, daß die Vorbehandlung und die Grundierung in zwei getrennten Schritten aufgebracht werden.The known high-speed coating processes have the disadvantage that the pretreatment and the primer are applied in two separate steps.
Aufgabe der Erfindung ist es, ein Verfahren für die großtechnische Herstellung von lackierten Bändern vorzuschlagen, bei dem die Vorbehandlung und Grundierung in nur einem Arbeitsgang aufgebracht werden kann.The object of the invention is to propose a process for the large-scale production of lacquered tapes, in which the pretreatment and priming can be applied in a single operation.
Die Aufgabe wird gelöst durch ein Verfahren zur Herstellung von beschichteten Metalloberflächen bei einer Beschichtungsgeschwindigkeit von mindestens 25 m pro Minute bei dem Auftragen eines Vorbehandlungsmittels auf eine gereinigte oder/und gebeizte Metalloberfläche, das dadurch gekennzeichnet ist, daß auf mindestens einer Fläche eines metallischen Körpers nach einem Reinigen oder/und einem Beizen der zu behandelnden metallischen Oberfläche mindestens ein Vorbehandlungsmittel, insbesondere eine Lösung oder/und Dispersion, aufgetragen wird und danach auf einem Teil der vorbehandelten Oberfläche mindestens eine Lackschicht aufgetragen wird, wobei die dabei nur mit einem Vorbehandlungsmittel und nicht mit einem Lack hergestellte Beschichtung als Behandlungsschicht anstelle einer Vorbehandlungs- und einer Grundierungsschicht eingesetzt wird.The object is achieved by a process for the production of coated metal surfaces at a coating speed of at least 25 m per minute when a pretreatment agent is applied to a cleaned or / and pickled metal surface, which is characterized in that on at least one surface of a metallic body according to a Cleaning or / and pickling the metallic surface to be treated, at least one pretreatment agent, in particular a solution and / or dispersion, is applied and then at least one layer of varnish is applied to part of the pretreated surface, with only one pretreatment agent and not one Paint produced coating is used as a treatment layer instead of a pretreatment and a primer layer.
Weiterhin wird die Aufgabe gelöst durch ein Verfahren zur Herstellung von beschichteten Metalloberflächen bei einer Beschichtungsgeschwindigkeit von mindestens 25 m pro Minute bei dem Auftragen eines Vorbehandlungsmittels auf eine gereinigte oder/und gebeizte Metalloberfläche, das dadurch gekennzeichnet ist, daß auf mindestens einer Fläche eines metallischen Körpers nach einem Reinigen oder/und einem Beizen der zu behandelnden metallischen Oberfläche mindestens ein Vorbehandlungsmittel, insbesondere eine Lösung oder/und Dispersion, aufgetragen wird und danach auf mindestens einem Teil der vorbehandelten Oberfläche mindestens eine Lackschicht aufgetragen wird, wobei die mit einem Vorbehandlungsmittel behandelte Beschichtung als Behandlungsschicht anstelle einer Vorbehandlungs- und einer Grundierungsschicht und eingesetzt wird.Furthermore, the object is achieved by a method for producing coated metal surfaces at a coating speed of at least 25 m per minute when applying a pretreatment agent to a cleaned or / and pickled metal surface, which is characterized in that at least one pretreatment agent, in particular, on at least one surface of a metallic body after cleaning and / or pickling the metal surface to be treated a solution or / and dispersion is applied and then at least one lacquer layer is applied to at least part of the pretreated surface, the coating treated with a pretreatment agent being used as a treatment layer instead of a pretreatment and a primer layer and.
Vorzugsweise wird die vorbehandelte Fläche bzw. die vorbehandelten Flächen eine Seite eines Bandes sein, bei dem gegebenenfalls auch mindestens eine der schmalen Randflächen des Bandes teilweise vorbehandelt sein kann.The pretreated surface or the pretreated surfaces will preferably be one side of a band, on which at least one of the narrow edge surfaces of the band may also have been partially pretreated.
Die Beschichtungsgeschwindigkeit beträgt vorzugsweise 40 bis 600 m pro Minute, besonders bevorzugt 75 bis 160 m pro Minute. Die Behandlungsschicht übernimmt dabei die Funktionen der Grundierung (Primer). Der andere Teil der vorbehandelten Oberfläche wird nachträglich nicht mehr auf der Bandbeschichtungsanlage mit einem Lack überzogen.The coating speed is preferably 40 to 600 m per minute, particularly preferably 75 to 160 m per minute. The treatment layer takes over the functions of the primer. The other part of the pretreated surface is no longer coated with a varnish on the coil coating system.
Das erfindungsgemäße Verfahren kann so eingesetzt werden, daß Feuchtigkeit oder Restfeuchte in der aufgetragenen Vorbehandlungsschicht bis zum Lackieren erhalten bleibt, um die für das Aufbringen der Lackschicht notwendige elektrische Leitfähigkeit der vorbehandelten Oberfläche einzustellen.The method according to the invention can be used in such a way that moisture or residual moisture in the applied pretreatment layer is retained until it is coated in order to adjust the electrical conductivity of the pretreated surface which is necessary for the application of the coating layer.
Die Metalloberfläche kann vor dem Vorbehandeln insbesondere Aluminium, Eisen, Kupfer, Magnesium, Zink oder/und Zinn enthalten und kann vorzugsweise aus einer Aluminiumlegierung, einem schmelztauchverzinkten oder elektrolytisch verzinkten Eisenwerkstoff, einem Stahl, einem Zink-Vollmaterial in Form von Bändern oder Blechen oder einem Weißblech bestehen. Hierbei können die Körper eben oder verformt sein, ohne oder mit Ausnehmungen wie z.B. mit einer Lochstruktur versehen sein. Die Ausnehmungen einer Lochplatte können alle die gleiche oder ggf. auch unterschiedliche Geometrien und Größen aufweisen: Z.B. kreisförmige Löcher, Langlöcher, Schlitze.Before the pretreatment, the metal surface can contain in particular aluminum, iron, copper, magnesium, zinc and / or tin and can preferably be made of an aluminum alloy, a hot-dip galvanized or electrolytically galvanized iron material, a steel, a solid zinc material in the form of strips or sheets or one Tinplate exist. Here, the bodies can be flat or deformed, without or with recesses such as a perforated structure his. The recesses of a perforated plate can all have the same or, if appropriate, also different geometries and sizes: for example circular holes, elongated holes, slots.
Die Reinigung oder/und das Beizen der metallischen Oberfläche kann durch Sprühen oder/und Bürsten mit einer Reinigungs- bzw. Beizlösung oder Tauchen in ein Bad dieser Lösung erfolgen.The cleaning or / and pickling of the metallic surface can be done by spraying or / and brushing with a cleaning or pickling solution or dipping into a bath of this solution.
Die Vorbehandlung der gereinigten oder/und gebeizten Oberfläche kann durch Aufsprühen und Abquetschen z.B. mit einer Walze, durch Aufsprühen und Abblasen z.B. mit Preßluft, durch Tauchen und Abquetschen z.B. mit einer Walze, durch Tauchen und Abblasen z.B. mit Preßluft oder im Roll-Coat-Verfahren erfolgen. Beim Roll-Coat-Verfahren wird die Behandlungsflüssigkeit mit einer Beschichtungswalze in oder entgegen der Bandlaufrichtung aufgetragen. Bei allen diesen Verfahrensvarianten wird keine nachträgliche Spülung ausgeführt, um einen Abtrag bzw. eine Beschädigung der aufgebrachten Schicht zu vermeiden und um mit Chemikalien belastete Spülwässer zu vermeiden, die aus Umweltgründen aufwendig nachbehandelt werden müssen.The pretreatment of the cleaned or / and pickled surface can be carried out by spraying and squeezing e.g. with a roller, by spraying and blowing off e.g. with compressed air, by dipping and squeezing e.g. with a roller, by dipping and blowing off e.g. with compressed air or in the roll-coat process. In the roll-coat process, the treatment liquid is applied with a coating roller in or against the direction of the belt. In all of these process variants, no subsequent rinsing is carried out in order to avoid erosion or damage to the applied layer and to avoid rinsing water contaminated with chemicals, which have to be post-treated for environmental reasons.
Das Vorbehandlungsmittel kann eine Zubereitung sein, die eine Polymerdispersion mit mindestens einem Harz aus der Gruppe von Acrylat, Epoxid, Phenol, Polyester, Siliconpolyester, Polyurethan, Styrol und Harz auf der Basis Harnstoff-Formaldehyd bzw. deren Mischung oder/und Mischpolymerisat enthält. Die Zubereitung enthält neben flüchtigen Anteilen ein nichtflüchtiges filmbildendes Gemisch. Die Zubereitung kann mindestens ein Harz als Lösung oder/und als Dispersion enthalten. Die Zubereitung kann neben Harz(en) mindestens einen anorganischen Zusatz in gelöster Form oder/und als feinverteiltes Pulver wie z.B. ein Carbonat, Chromat, Oxid, Phosphat, Silicat, Sulfat enthalten.The pretreatment agent can be a preparation which contains a polymer dispersion with at least one resin from the group consisting of acrylate, epoxy, phenol, polyester, silicone polyester, polyurethane, styrene and resin based on urea-formaldehyde or a mixture thereof and / or a copolymer. In addition to volatile components, the preparation contains a non-volatile film-forming mixture. The preparation can contain at least one resin as a solution and / or as a dispersion. In addition to resin (s), the preparation can contain at least one inorganic additive in dissolved form and / or as a finely divided powder, e.g. contain a carbonate, chromate, oxide, phosphate, silicate, sulfate.
Das Vorbehandlungsmittel kann auch eine Harz-freie Zubereitung sein, wobei die Zubereitung Aluminium, Fluorid, Flußsäure, Phosphat, Phosphorsäure, drei- oder/und sechswertiges Chromat, Chromsäure, Silicat, Silan, Tannin, Titan, Zink, Zirkonium oder/und selbst organisierende Moleküle z.B. auf Basis von Phosphonaten, Carbonsäuren, Thiolen oder/und Silanen enthalten kann.The pretreatment agent can also be a resin-free preparation, the preparation being aluminum, fluoride, hydrofluoric acid, phosphate, phosphoric acid, three- or / and hexavalent chromate, chromic acid, silicate, silane, tannin, titanium, zinc, zirconium and / or self-organizing molecules, for example based on phosphonates, carboxylic acids, thiols and / or silanes.
Für den Auftrag auf ein metallisches Band kann für die eine Seite des Bandes ein anderes Vorbehandlungsmittel gewählt werden als für die andere Seite, wobei die nicht zur nachträglichen Lackierung vorgesehene Seite mit einem organisches Harz enthaltenden Vorbehandlungsmittel beschichtet werden kann. Hierbei wird ggf. z.B. nur eine Seite eines Bandes - z.B. die Oberseite - lackiert, während auf der entgegengesetzten Seite die Vorbehandlung als Endbehandlung wirkt.For the application to a metallic tape, a different pretreatment agent can be selected for one side of the tape than for the other side, wherein the side not intended for subsequent painting can be coated with a pretreatment agent containing organic resin. Here, e.g. only one side of a volume - e.g. the top - painted, while on the opposite side the pre-treatment acts as a finishing treatment.
Nach dem Aufbringen des Behandlungsmittels kann die Schicht entweder teilgetrocknet oder durchgetrocknet werden. Dies kann - insbesondere bei gleicher Bandgeschwindigkeit und bei Nutzung vorhandener Öfen - durch eine kürzere Verweilzeit unter den aktiven Trocknungsbedingungen, durch eine geringere Temperatur im Ofen oder/und durch eine geringere Luftbewegung für Trocknung des Bandes umgesetzt werden.After the treatment agent has been applied, the layer can either be partially dried or thoroughly dried. This can be implemented - in particular with the same belt speed and when using existing ovens - by a shorter dwell time under the active drying conditions, by a lower temperature in the oven or / and by less air movement for drying the belt.
Vorzugsweise wird mindestens eine Seite der vorbehandelten Oberfläche mit einer organischen Beschichtung überzogen, die in einer Zeit von 1 Sekunde bis zu 3 Minuten ausreichend aushärtet bzw. vernetzt, besonders bevorzugt in einer Zeit von 5 Sekunden bis 2 Minuten.At least one side of the pretreated surface is preferably coated with an organic coating which hardens or crosslinks sufficiently in a time of 1 second to 3 minutes, particularly preferably in a time of 5 seconds to 2 minutes.
Für die Beschichtung der vorbehandelten Oberfläche wird bevorzugt ein Pulverlack aufgetragen und eingebrannt, insbesondere ein Pulverlack mit guten mechanischen Eigenschaften, hoher Kratzfestigkeit, guter Haftung und hoher Flexibilität in Bezug auf die Umformung. Der Pulverlack kann hierbei durch Sprühen, Wirbelsintern oder/und Powder Cloud Technology aufgebracht bzw. eingebrannt werden. Die Powder Cloud Technology wird u.a. in EP-A-0 678 466 beschrieben. Das Einbrennen kann anstelle der herkömmlichen Umlufttrocknung oder Schwebeumlufttrocknung insbesondere durch konduktive Trocknung bei magnetischen Werkstoffen bzw. durch Infrarottrocknung, insbesondere im Nahen Infrarot (NIR) erfolgen.For the coating of the pretreated surface, a powder coating is preferably applied and baked, in particular a powder coating with good mechanical properties, high scratch resistance, good adhesion and high flexibility with regard to the forming. The powder coating can be applied or burned in by spraying, fluidized bed sintering and / or powder cloud technology. Powder cloud technology is described, inter alia, in EP-A-0 678 466. The stoving can be used instead of conventional forced air drying or floating forced air drying in particular by conductive drying in the case of magnetic materials or by infrared drying, in particular in the near infrared (NIR).
Die Vorbehandlungs- bzw. Behandlungsschicht kann nach vollständigem Trocknen eine Schichtdicke im Bereich von 0,1 bis 50 μm aufweisen, vorzugsweise im Bereich von 0,5 bis 10 μm, ganz besonders bevorzugt im Bereich von 1 bis 3 μm.After complete drying, the pretreatment or treatment layer can have a layer thickness in the range from 0.1 to 50 μm, preferably in the range from 0.5 to 10 μm, very particularly preferably in the range from 1 to 3 μm.
Die eingebrannte Lackschicht, die sich auf der Vorbehandlungsschicht befindet, kann nach dem Vernetzen eine Schichtdicke im Bereich von 5 bis 1000 μm aufweisen, vorzugsweise im Bereich von 10 bis 400 μm, ganz besonders bevorzugt im Bereich von 15 bis 60 μm. Bei der Verwendung von PVC-Plastisolen kann es sich empfehlen, eine Schichtdicke im Bereich von 100 bis 300 μm zu wählen.The baked lacquer layer, which is located on the pretreatment layer, can have a layer thickness after crosslinking in the range from 5 to 1000 μm, preferably in the range from 10 to 400 μm, very particularly preferably in the range from 15 to 60 μm. When using PVC plastisols, it may be advisable to choose a layer thickness in the range of 100 to 300 μm.
Bei dem erfindungsgemäßen Verfahren wird in einer bevorzugten Ausgestaltung ein Einschichtdecklack als einziger Lack auf das zu beschichtende Band aufgebracht.In a preferred embodiment of the method according to the invention, a single-layer topcoat is applied as the only lacquer to the strip to be coated.
Mit dem Vorbehandlungsmittel kann eine Behandlungsschicht ausgebildet werden, die die Funktion einer Vorbehandlung und gleichzeitig einer Grundierung (Primer) übernimmt. Die Grundierung (Primer) übernimmt hierbei die Funktion des Korrosionsschutzes, der Haftung und der Flexibilität erfüllt, aber nicht in stärkerem Maß auch eine ästhetische Funktion.A treatment layer can be formed with the pretreatment agent, which takes on the function of a pretreatment and at the same time a primer. The primer takes on the function of corrosion protection, adhesion and flexibility, but not to a greater extent also an aesthetic function.
Bei dem Pulverlack kann ein Pulver für einen einfarbig unstrukturierten Überzug, ein Pulver für einen mehrfarbig unstrukturierten Überzug oder/und ein Pulver für einen mehrfarbig strukturierten Überzug verwendet werden.A powder for a monochrome unstructured coating, a powder for a multicolored unstructured coating or / and a powder for a multicolored structured coating can be used in the powder coating.
Die beschichtete Oberfläche kann mindestens teilweise durch eine Folie oder Klebefolie geschützt werden, insbesondere vor mechanischer Beeinträchtigung z.B. während Lagerung, Transport und Weiterverarbeitung. Die beschichteten Körper können gegebenenfalls verformt, geschnitten - insbesondere in Längs- oder/und in Querrichtung geschnitten - und gegebenenfalls noch einmal verformt werden, wie z.B. gebörtelt, rollgeformt, tiefgezogen oder/und abgekantet werden.The coated surface can be at least partially protected by a film or adhesive film, in particular against mechanical impairment, for example during storage, transport and further processing. The coated bodies can optionally be deformed, cut - in particular cut lengthways and / or in the transverse direction - and optionally deformed again, such as, for example, flared, roll-formed, deep-drawn and / or folded.
Die nach dem erfindungsgemäßen Verfahren hergestellten Produkte können als Innen- und Außenverkleidungen, Geräteverkleidungen z.B. für Haushaltsgeräte und Kleinelektrogeräte, insbesondere mit dekorierter Außenverkleidung, Lochbleche insbesondere für Lautsprecher und Schallschutzverkleidungeπ, Raumteiler, Trennwände, Möbelelemente, Regale, Fahrzeug- und Flugzeuginnenverkleidungen wie z.B. Armaturenbretter, Rahmen und Rahmenkonstruktionen, Verblendungen, Beleuchtungskörper verwendet werden. The products produced by the process according to the invention can be used as inner and outer cladding, device cladding e.g. for household appliances and small electrical appliances, in particular with decorated outer cladding, perforated plates, in particular for loudspeakers and soundproofing linings, room dividers, partitions, furniture elements, shelves, vehicle and aircraft interior linings such as Dashboards, frames and frame constructions, facings, lighting fixtures are used.

Claims

Patentansprüche claims
1. Verfahren zur Herstellung von beschichteten Metalloberflächen bei einer Beschichtungsgeschwindigkeit von mindestens 25 m pro Minute, insbesondere bei einer Beschichtungsgeschwindigkeit im Bereich von 40 bis 600 m pro Minute, vorzugsweise von 75 bis 160 m pro Minute, bei dem Auftragen eines1. Process for the production of coated metal surfaces at a coating speed of at least 25 m per minute, in particular at a coating speed in the range from 40 to 600 m per minute, preferably from 75 to 160 m per minute, when applying a
Vorbehandlungsmittels auf eine gereinigte oder/und gebeizte Metalloberfläche, dadurch gekennzeichnet, daß auf mindestens einer Fläche eines metallischen Körpers nach einem Reinigen oder/und einem Beizen der zu behandelnden metallischen Oberfläche mindestens ein Vorbehandlungsmittel, insbesondere eine Lösung oder/und Dispersion, aufgetragen wird und danach auf einem Teil der vorbehandelten Oberfläche mindestens eine Lackschicht aufgetragen wird, wobei die dabei nur mit einem Vorbehandlungsmittel und nicht mit einem Lack hergestellte Beschichtung als Behandlungsschicht anstelle einer Grundierungsund Vorbehandlungsschicht eingesetzt wird.Pretreatment agent on a cleaned or / and pickled metal surface, characterized in that at least one pretreatment agent, in particular a solution and / or dispersion, is applied to at least one surface of a metallic body after cleaning and / or pickling of the metallic surface to be treated, and thereafter at least one lacquer layer is applied to part of the pretreated surface, the coating produced here only with a pretreatment agent and not with a lacquer being used as the treatment layer instead of a primer and pretreatment layer.
2. Verfahren zur Herstellung von beschichteten Metalloberflächen bei einer Beschichtungsgeschwindigkeit von mindestens 25 m pro Minute, insbesondere bei einer Beschichtungsgeschwindigkeit im Bereich von 40 bis 600 m pro Minute, vorzugsweise von 75 bis 160 m pro Minute, bei dem Auftragen eines Vorbehandlungsmittels auf eine gereinigte oder/und gebeizte Metalloberfläche, dadurch gekennzeichnet, daß auf mindestens einer Fläche eines metallischen2. Process for the production of coated metal surfaces at a coating speed of at least 25 m per minute, in particular at a coating speed in the range from 40 to 600 m per minute, preferably from 75 to 160 m per minute, when applying a pretreatment agent to a cleaned or / and pickled metal surface, characterized in that on at least one surface of a metallic
Körpers nach einem Reinigen oder/und einem Beizen der zu behandelnden metallischen Oberfläche mindestens ein Vorbehandlungsmittel, insbesondere eine Lösung oder/und Dispersion, aufgetragen wird und danach auf mindestens einem Teil der vorbehandelten Oberfläche mindestens eine Lackschicht aufgetragen wird, wobei die mit einem Vorbehandlungsmittel behandelteAfter cleaning or / and pickling the metallic surface to be treated, at least one pretreatment agent, in particular a solution or / and dispersion, is applied and then at least one lacquer layer is applied to at least part of the pretreated surface, the layer treated with a pretreatment agent
Beschichtung als Behandlungsschicht anstelle einer Grundierungs- und Vorbehandlungsschicht eingesetzt wird. Coating is used as a treatment layer instead of a primer and pre-treatment layer.
3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Feuchtigkeit oder Restfeuchte in der aufgetragenen Vorbehandlungsschicht bis zum Lackieren erhalten wird, um die für das Aufbringen der Lackschicht notwendige elektrische Leitfähigkeit der vorbehandelten Oberfläche einzustellen.3. The method according to claim 1 or 2, characterized in that the moisture or residual moisture in the applied pretreatment layer is obtained until painting in order to adjust the electrical conductivity of the pretreated surface necessary for the application of the paint layer.
4. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß die Metalloberfläche vor dem Vorbehandeln Aluminium, Eisen, Kupfer, Magnesium, Zink oder/und Zinn enthält und vorzugsweise aus einer Aluminiumlegierung, einem schmelztauchverzinkten oder elektrolytisch verzinkten Eisenwerkstoff, einem Stahl, einem Zink-Vollmaterial in Form von4. The method according to any one of the preceding claims, characterized in that the metal surface contains pretreatment aluminum, iron, copper, magnesium, zinc or / and tin and preferably made of an aluminum alloy, a hot-dip galvanized or electrolytically galvanized iron material, a steel, a zinc -Full material in the form of
Bändern oder Blechen oder einem Weißblech besteht.Strips or sheets or tinplate.
5. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß die Reinigung oder/und das Beizen durch Sprühen oder/und Bürsten mit einer Reinigungs- bzw. Beizlösung oder Tauchen in ein Bad dieser Lösung erfolgt.5. The method according to any one of the preceding claims, characterized in that the cleaning or / and pickling is carried out by spraying or / and brushing with a cleaning or pickling solution or immersion in a bath of this solution.
6. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß das Vorbehandlungsmittel durch Aufsprühen und Abquetschen z.B. mit einer Walze, durch Aufsprühen und Abblasen z.B. mit Preßluft, durch Tauchen und Abquetschen, durch Tauchen und Abblasen oder im Roll-Coat-Verfahren aufgetragen wird.6. The method according to any one of the preceding claims, characterized in that the pretreatment agent by spraying and squeezing e.g. with a roller, by spraying and blowing off e.g. with compressed air, by dipping and squeezing, by dipping and blowing off or in the roll-coat process.
7. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß das Vorbehandlungsmittel eine Zubereitung ist, die eine Polymerdispersion mit mindestens einem Harz aus der Gruppe von Acrylat, Epoxid, Phenol, Polyester, Siliconpolyester, Polyurethan, Styrol und Harz auf der Basis Harnstoff-Formaldehyd bzw. deren Mischung oder/und Mischpolymerisat enthält. 7. The method according to any one of the preceding claims, characterized in that the pretreatment agent is a preparation which is a polymer dispersion with at least one resin from the group of acrylate, epoxy, phenol, polyester, silicone polyester, polyurethane, styrene and resin based on urea Contains formaldehyde or its mixture or / and copolymer.
8. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß das Vorbehandlungsmittel eine Zubereitung ist, die mindestens ein Harz als Lösung oder/und als Dispersion enthält.8. The method according to any one of the preceding claims, characterized in that the pretreatment agent is a preparation which contains at least one resin as a solution and / or as a dispersion.
9. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß das Vorbehandlungsmittel eine Zubereitung ist, die neben Harz(en) mindestens einen anorganischen Zusatz in gelöster Form oder/und als feinverteiltes Pulver wie z.B. ein Carbonat, Chromat, Oxid, Phosphat, Silicat, Sulfat enthält.9. The method according to any one of the preceding claims, characterized in that the pretreatment agent is a preparation which in addition to resin (s) at least one inorganic additive in dissolved form and / or as a finely divided powder such as e.g. contains a carbonate, chromate, oxide, phosphate, silicate, sulfate.
10. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß das Vorbehandlungsmittel eine Harz-freie Zubereitung ist, die Aluminium,10. The method according to any one of the preceding claims, characterized in that the pretreatment agent is a resin-free preparation, the aluminum,
Fluorid, Flußsäure, Phosphat, Phosphorsäure, drei- oder/und sechswertiges Chromat, Chromsäure, Silicat, selbst organisierende Moleküle, Silan, Tannin, Titan, Zink oder/und Zirkonium enthält.Contains fluoride, hydrofluoric acid, phosphate, phosphoric acid, tri- or / and hexavalent chromate, chromic acid, silicate, self-organizing molecules, silane, tannin, titanium, zinc or / and zirconium.
11. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß für den Auftrag auf ein Band für die eine Seite des Bandes ein anderes11. The method according to any one of the preceding claims, characterized in that for the application to a tape for one side of the tape another
Vorbehandlungsmittel gewählt wird als für die andere Seite, wobei die nicht zur nachträglichen Lackierung vorgesehene Seite mit einem organisches Harz enthaltenden Vorbehandlungsmittel beschichtet werden kann.Pretreatment agent is chosen as for the other side, wherein the side not intended for subsequent painting can be coated with a pretreatment agent containing organic resin.
12. Verfahren nach Anspruch 6, dadurch gekennzeichnet, daß die mit dem Vorbehandlungsmittel aufgebrachte Schicht entweder teilgetrocknet oder durchgetrocknet wird.12. The method according to claim 6, characterized in that the layer applied with the pretreatment agent is either partially dried or thoroughly dried.
13. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß mindestens eine Seite der vorbehandelten Oberfläche mit einer organischen Beschichtung überzogen wird, die in einer Zeit von 1 Sekunde bis zu 3 Minuten ausreichend aushärtet bzw. vernetzt, vorzugsweise in einer Zeit von 5 Sekunden bis 2 Minuten.13. The method according to any one of the preceding claims, characterized in that at least one side of the pretreated surface is coated with an organic coating which in a time from 1 second to sufficiently hardened or crosslinked to 3 minutes, preferably in a time of 5 seconds to 2 minutes.
14. Verfahren nach Anspruch 13, dadurch gekennzeichnet, daß für die Beschichtung der vorbehandelten Oberfläche ein Pulverlack aufgetragen und eingebrannt wird, insbesondere ein Pulverlack mit guten mechanischen14. The method according to claim 13, characterized in that a powder coating is applied and baked for coating the pretreated surface, in particular a powder coating with good mechanical
Eigenschaften, hoher Kratzfestigkeit, guter Haftung und hoher Flexibilität in Bezug auf die Umformung.Properties, high scratch resistance, good adhesion and high flexibility in terms of forming.
15. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß der Pulverlack durch Sprühen, Wirbelsintern oder/und Powder Cloud Technology aufgebracht bzw. eingebrannt wird.15. The method according to any one of the preceding claims, characterized in that the powder coating is applied or baked by spraying, fluidized bed sintering and / or powder cloud technology.
16. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß die Vorbehandlungs- bzw. Behandlungsschicht nach vollständigem Trocknen eine Schichtdicke im Bereich von 0,1 bis 50 μm aufweist, vorzugsweise im Bereich von 0,5 bis 10 μm, ganz besonders bevorzugt im Bereich von 1 bis 3 μm.16. The method according to any one of the preceding claims, characterized in that the pretreatment or treatment layer after complete drying has a layer thickness in the range of 0.1 to 50 microns, preferably in the range of 0.5 to 10 microns, most preferably in Range from 1 to 3 μm.
17. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß die eingebrannte Lackschicht nach dem Vernetzen eine Schichtdicke im Bereich von 5 bis 1000 μm aufweist, vorzugsweise im Bereich von 10 bis 400 μm, ganz besonders bevorzugt im Bereich von 15 bis 60 μm.17. The method according to any one of the preceding claims, characterized in that the baked lacquer layer after crosslinking has a layer thickness in the range from 5 to 1000 microns, preferably in the range from 10 to 400 microns, very particularly preferably in the range from 15 to 60 microns.
18. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß als einziger Lack ein Einschichtdecklack bei der hohen Geschwindigkeit aufgebracht wird. 18. The method according to any one of the preceding claims, characterized in that a single-coat topcoat is applied as the only lacquer at high speed.
19. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß mit dem Vorbehandlungsmittel eine Behandlungsschicht ausgebildet wird, die die Funktion einer Vorbehandlung und Grundierung (Primer) übernimmt.19. The method according to any one of the preceding claims, characterized in that a treatment layer is formed with the pretreatment agent, which takes over the function of a pretreatment and primer.
20. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß ein Pulver für einen einfarbig unstrukturierten Überzug, ein Pulver für einen mehrfarbig unstrukturierten Überzug oder/und ein Pulver für einen mehrfarbig strukturierten Überzug verwendet wird.20. The method according to any one of the preceding claims, characterized in that a powder for a monochrome unstructured coating, a powder for a multicolored unstructured coating or / and a powder for a multicolored structured coating is used.
21. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß die beschichtete Oberfläche mindestens teilweise durch eine Folie oder Klebefolie geschützt wird.21. The method according to any one of the preceding claims, characterized in that the coated surface is at least partially protected by a film or adhesive film.
22. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß die beschichteten Körper gegebenenfalls verformt, geschnitten - insbesondere in Längs- oder/und in Querrichtung geschnitten - und gegebenenfalls noch einmal verformt werden, wie z.B. gebörtelt, rollgeformt, tiefgezogen oder/und abgekantet werden.22. The method according to any one of the preceding claims, characterized in that the coated body optionally deformed, cut - in particular cut in the longitudinal or / and in the transverse direction - and optionally deformed again, such as flanged, roll-formed, deep-drawn and / or folded.
23. Verwendung der nach dem Verfahren gemäß den Ansprüchen 1 bis 22 hergestellten Produkte als Innen- und Außenverkleidungen, Geräteverkleidungen z.B. für Haushaltsgeräte und Kleinelektrogeräte, insbesondere mit dekorierter Außenverkleidung, Lochbleche insbesondere für Lautsprecher und Schallschutzverkleidungen, Raumteiler, Trennwände,23. Use of the products produced by the process according to claims 1 to 22 as inner and outer cladding, device cladding e.g. for household appliances and small electrical appliances, in particular with decorated external cladding, perforated sheets, in particular for loudspeakers and soundproofing claddings, room dividers, partition walls,
Möbelelemente, Regale, Fahrzeug- und Flugzeuginnenverkleidungen wie z.B. Armaturenbretter, Rahmen und Rahmenkonstruktionen, Verblendungen, Beleuchtungskörper. Furniture elements, shelves, vehicle and aircraft interior panels such as Dashboards, frames and frame constructions, facings, lighting fixtures.
EP00983330A 1999-12-17 2000-12-14 Method for producing coated metal surfaces and the use of said metal surfaces Expired - Lifetime EP1242193B1 (en)

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