EP2976163B1 - Method - Google Patents

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Publication number
EP2976163B1
EP2976163B1 EP14708528.6A EP14708528A EP2976163B1 EP 2976163 B1 EP2976163 B1 EP 2976163B1 EP 14708528 A EP14708528 A EP 14708528A EP 2976163 B1 EP2976163 B1 EP 2976163B1
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EP
European Patent Office
Prior art keywords
body part
painting
layer
water
motor vehicle
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Revoked
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EP14708528.6A
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German (de)
French (fr)
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EP2976163A1 (en
Inventor
Uwe Hornig
Ulrike Burg
Katharina Gallenkemper
Klaus Christen
Klaus ROTHS
Dirk Altmann
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Volkswagen AG
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Volkswagen AG
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    • 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
    • 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
    • B05D7/56—Three layers or more
    • B05D7/57—Three layers or more the last layer being a clear coat
    • B05D7/572—Three layers or more the last layer being a clear coat all layers being cured or baked together

Definitions

  • the present invention relates to a method for painting a body part of a motor vehicle, which comprises the method steps mentioned in claim 1.
  • one or more special basecoat films are used which may comprise several components.
  • cathodic dip painting is followed by the application of a pre-zone varnish, to which a special basecoat is applied.
  • the Vorzonenlack be executed as a one-component Vorzonenlack or as a two-component Vorzonenlack and color matched to the subsequently applied basecoat.
  • the coating processes involving the application of a filler generate high energy costs, in particular because burning the filler is very energy intensive, the special basecoats needed for the paint processes involving no filler are more expensive.
  • these special basecoats considerably fewer color shades than with the simple basecoats which are used in the coating processes involving a filler can be realized.
  • DE 103 11 476 A1 discloses a method in which after a cathodic dip coating in the next step, a water-based paint is applied. Finally, a powder slurry clearcoat is applied after the application of another aqueous basecoat.
  • GB 2 308 554 A discloses a method for painting a body part of a motor vehicle, in which after a cathodic dip coating a metallic paint is applied wet in wet and then drying takes place. The coating applied during the cathodic dip coating simultaneously constitutes a bonding layer to the subsequently applied metallic paint.
  • US 2010/0143705 A1 discloses a process for the production of multilayer coatings in light metal shades, in which a base coat is applied to a pre-painted substrate, then a clear coat is applied and the base coat and clear coat are co-cured.
  • WO 2007/044773 A2 discloses a method for building a multilayer coating, in particular for the exterior painting of motor vehicles, in which a basecoat and then a clearcoat are applied to an electrodeposited primer layer and these three layers are cured simultaneously.
  • a method for painting a body part of a motor vehicle comprises the following method steps: performing a cathodic dip coating, then applying a Vorzonenlacktik as a two-component lacquer layer, wherein the second component is designed as a hardener additive, as a wet-in-wet low-temperature filler without prior drying of cathodic dip coating, subsequent application of a water-dilutable basecoat film as a coloring layer, subsequent application of a clearcoat film and baking of the clearcoat film.
  • the basecoat to be used according to the invention is a simple one, widespread in its use as well as cost-effective paint, which is no longer to vote on the used in the painting process Vorzonenlack.
  • the related Vorzonenlack can be applied as a wet-in-wet paint, so that the previously applied paint does not need to dry.
  • the subsequent application of the basecoat can be done almost immediately after the application of the Vorzonenlacks. As a result, waiting or service life in the painting process can be drastically reduced compared with the state of the art.
  • Vorzonenlack In the step of applying a Vorzonenlack Anlagen the Vorzonenlack harsh is designed as a two-component lacquer layer. This is the second component of the two-component Vorzonenlacks or 2K-Vorzonenlacks to a hardener additive, so a hardener or a hardening agent, which the 2K-Vorzonenlack good adhesion to the underlying layer or under him layers and a good Resistance to stone chips.
  • the method for painting a body part of a motor vehicle preferably also comprises the step of ventilating the clearcoat layer applied to the body part.
  • the step of applying a waterborne basecoat layer to the body panel further comprises the step of intermediate drying the waterborne basecoat layer.
  • Such an intermediate drying of the water-dilutable basecoat layer applied to the body part can be followed by the application of a clearcoat material directly to the intermediate drying. As a result, the total time taken by the painting process of the body part can be reduced again.
  • the waterborne basecoat material is a coloring layer.
  • the waterborne basecoat material preferably comprises organic and / or inorganic pigments.
  • the water-dilutable basecoat preferably comprises synthetic resin.
  • the water-dilutable basecoat comprises at least one effect generator and / or a solvent.
  • the water-dilutable basecoat used is a cost-effective, water-dilutable basecoat which already has or provides the hue or dye to which the bodywork part to be painted after completion of the process for painting a bodywork part of a motor vehicle , So after completion of the painting process should have.
  • this water-dilutable basecoat is particularly cost-effective.
  • for such simple, water-dilutable basecoats in particular because of their widespread use, far more color shades have been developed and released than for the special basecoats of other coating processes of the prior art.
  • FIG. 1 a flowchart of an embodiment of a method according to the invention for painting a body part of a motor vehicle is shown.
  • the inventive method begins in this embodiment with the step of performing a cathodic dip paint S1, in this embodiment, a body part of a motor vehicle.
  • the body part is completely submerged in a trough in this embodiment for pretreatment and placed on a predetermined electrical potential, which differs from the potential of a counter electrode located in the tub.
  • the trough is in this embodiment further comprises an electrically conductive, aqueous dip coat, which, stimulated by a DC field, which is applied between the counter electrode and the body part, settles on the body part.
  • the method step of applying a pre-zone lacquer layer S3 as a wet-on-wet low-temperature filler is followed by the body part to be painted. Since the pre-zone lacquer layer is applied wet to wet, no drying of the lacquer layer applied during the cathodic dip coating must be carried out prior to application of the pre-zone lacquer. The Vorzonenlack or Vorzonelack harsh is thus applied directly to the not yet dried, applied during the cathodic dip coating paint layer.
  • the pre-zone lacquer is a two-component pre-zone lacquer, wherein the second component of this pre-zone lacquer is designed as a hardener additive. Such two-component pre-zone coatings can be obtained, for example, from DuPont.
  • FIG. 1 illustrated flow diagram of an embodiment of a method according to the invention for painting a body part of a motor vehicle is followed by the application of a Vorzonenlack Anlagen S3 the application of a water-dilutable basecoat layer S4 on the body part.
  • the water-dilutable basecoat is a coloring layer, that is to say has the color which the body part to be painted should have after the end of the process.
  • the water-dilutable basecoat purely by way of example a red color.
  • the optional step of intermediate drying S6 of the water-dilutable basecoat layer follows, in which the water-dilutable basecoat is first dried prior to the further treatment of the bodywork part.
  • the intermediate drying S6 in this exemplary embodiment of the method is followed, by way of example, by the application of a clearcoat film S2 to the bodywork part as well as the burning in of the clearcoat film applied to the bodywork part.
  • the clearcoat layer may also have a hue or a substance adjusting or at least influencing the hue or the appearance of the body part and / or a material adjusting or at least influencing the hue or appearance of the body part and / or adjusting the hue or appearance of the body part or at least influencing component.
  • the method according to the invention furthermore optionally comprises the step of unclamping S5 of the clearcoat layer applied to the bodywork part.
  • embodiments of the method according to the invention for painting in particular a body part of a motor vehicle can be carried out, which do not include such a step of venting.
  • the method step of flash-off S5 the method according to the invention is completed purely by way of example in this exemplary embodiment.
  • processes according to the invention which, in addition to those listed above, also comprise further process steps and / or in which the abovementioned process steps are carried out in a sequence other than that shown above.

Description

Die vorliegende Erfindung betrifft ein Verfahren zur Lackierung eines Karosserieteils eines Kraftfahrzeugs, welches die im Patentanspruch 1 genannten Verfahrensschritte umfasst.The present invention relates to a method for painting a body part of a motor vehicle, which comprises the method steps mentioned in claim 1.

Dem Stand der Technik sind eine Vielzahl verschiedenartiger Prozesse bekannt, welche der Lackierung der Karosserieteile von Kraftfahrzeugen dienen. Die meisten dieser Prozesse beginnen mit dem Schritt der Durchführung einer kathodischen Tauchlackierung des Karosserieteils. Bei meist älteren Lackierprozessen schließt sich an diese Tauchlackierung das Auftragen eines so genannten Füllers beziehungsweise einer Füller-Lackschicht auf das Karosserieteil sowie das Einbrennen dieser Füller-Lackschicht in das Karosserieteil an. Der Füller hat die Aufgabe, die Unebenheiten im Untergrund des Karosserieteils aufzufüllen. Oft wird auf diese Füller-Lackschicht eine einfache, wasserverdünnte oder wasserverdünnbare Basislackschicht aufgetragen, auf welche nach einem Zwischentrocknen ein Klarlack aufgetragen und eingebrannt wird.The prior art, a variety of different processes are known, which serve the painting of the body parts of motor vehicles. Most of these processes begin with the step of performing a cathodic dip painting of the body part. In most older painting processes, this dip painting is followed by the application of a so-called filler or a filler lacquer coating to the body part as well as the baking of this filler lacquer coating into the bodywork part. The filler has the task to fill in the unevenness in the background of the body part. Often, a simple, water-diluted or water-dilutable basecoat film is applied to this filler paint coat, onto which a clear coat is applied and baked after intermediate drying.

In moderneren Lackierprozessen werden anstelle eines Füllers eine oder mehrere spezielle Basislackschichten verwendet, welche mehrere Komponenten umfassen können. Bei anderen Lackierprozessen folgt auf die kathodische Tauchlackierung das Auftragen eines Vorzonenlacks, auf welchen wiederum ein spezieller Basislack aufgetragen wird. Dabei ist der Vorzonenlack als Einkomponenten-Vorzonenlack oder als Zweikomponenten-Vorzonenlack ausführbar und farblich auf den anschließend aufzutragenden Basislack abzustimmen. Während die das Auftragen eines Füllers umfassenden Lackierprozesse hohe Energiekosten generieren, insbesondere, da das Einbrennen des Füllers sehr energieintensiv ist, sind die speziellen Basislacke, welche für die keinen Füller involvierenden Lackierprozesse benötigt werden, teurer. Ferner sind mit diesen speziellen Basislacken erheblich weniger Farbtöne als mit den einfachen Basislacken, welche bei den einen Füller involvierenden Lackierprozessen zum Einsatz kommen, realisierbar.In more modern painting processes, instead of a filler, one or more special basecoat films are used which may comprise several components. In other painting processes, cathodic dip painting is followed by the application of a pre-zone varnish, to which a special basecoat is applied. In this case, the Vorzonenlack be executed as a one-component Vorzonenlack or as a two-component Vorzonenlack and color matched to the subsequently applied basecoat. While the coating processes involving the application of a filler generate high energy costs, in particular because burning the filler is very energy intensive, the special basecoats needed for the paint processes involving no filler are more expensive. Furthermore, with these special basecoats, considerably fewer color shades than with the simple basecoats which are used in the coating processes involving a filler can be realized.

DE 103 11 476 A1 offenbart ein Verfahren, bei dem nach einer kathodischen Tauchlackierung im nächsten Schritt ein Wasserbasislack aufgebracht wird. Es wird schließlich nach dem Aufbringen eines weiteren Wasserbasislackes ein Pulver-Slurry-Klarlack aufgebracht. DE 103 11 476 A1 discloses a method in which after a cathodic dip coating in the next step, a water-based paint is applied. Finally, a powder slurry clearcoat is applied after the application of another aqueous basecoat.

GB 2 308 554 A offenbart ein Verfahren zur Lackierung eines Karosserieteiles eines Kraftfahrzeuges, bei dem nach einer kathodischen Tauchlackierung ein Metalliclack nass in nass aufgebracht wird und anschließend eine Trocknung erfolgt. Die während der kathodischen Tauchlackierung aufgebrachte Beschichtung stellt gleichzeitig eine Verbindungsschicht zu dem nachträglich aufzubringenden Metalliclack dar
US 2010/0143705 A1 offenbart ein Verfahren zur Herstellung von mehrschichtigen Überzügen in Leichtmetallfarbtönen, bei dem eine Grundlackschicht auf ein vorlackiertes Substrat aufgebracht wird, anschließend eine Klarlackschicht aufgebracht wird und Grundlackschicht und Klarlackschicht gemeinsam ausgehärtet werden. GB 2 308 554 A discloses a method for painting a body part of a motor vehicle, in which after a cathodic dip coating a metallic paint is applied wet in wet and then drying takes place. The coating applied during the cathodic dip coating simultaneously constitutes a bonding layer to the subsequently applied metallic paint
US 2010/0143705 A1 discloses a process for the production of multilayer coatings in light metal shades, in which a base coat is applied to a pre-painted substrate, then a clear coat is applied and the base coat and clear coat are co-cured.

WO 2007/044773 A2 offenbart ein Verfahren zum Aufbau einer mehrlagigen Beschichtung, insbesondere für den Außenanstrich von Kraftfahrzeugen, bei dem auf eine elektrochemisch abgeschiedene Grundierungsschicht ein Basislack und anschließend ein Klarlack aufgebracht wird und diese drei Schichten gleichzeitig ausgehärtet werden. WO 2007/044773 A2 discloses a method for building a multilayer coating, in particular for the exterior painting of motor vehicles, in which a basecoat and then a clearcoat are applied to an electrodeposited primer layer and these three layers are cured simultaneously.

Es ist Aufgabe der Erfindung, ein Verfahren zur Lackierung eines Karosserieteils eines Kraftfahrzeugs bereitzustellen, welches eine steinschlagbeständige und gleichzeitig kostengünstige Lackierung zum Beispiel eines Karosserieteils ermöglicht.It is an object of the invention to provide a method for painting a body part of a motor vehicle, which enables a stone impact resistant and at the same time cost-effective painting, for example, a body part.

Diese Aufgabe wird erfindungsgemäß mit einem Verfahren gemäß dem Hauptanspruch gelöst. Vorteilhafte Ausgestaltungen sind in den Unteransprüchen beschrieben.This object is achieved by a method according to the main claim. Advantageous embodiments are described in the subclaims.

Erfindungsgemäß wird ein Verfahren zur Lackierung eines Karosserieteils eines Kraftfahrzeugs bereitgestellt, das folgende Verfahrensschritte umfasst: Durchführen einer kathodischen Tauchlackierung, anschließendes Auftragen einer Vorzonenlackschicht als Zweikomponentenlackschicht, wobei die zweite Komponente als Härterzusatz ausgeführt ist, als nass-in-nass-Niedrigtemperaturfüller ohne vorherige Trocknung der kathodischen Tauchlackierung, anschließendes Aufbringen einer wasserverdünnbaren Basislackschicht als farbgebende Schicht, anschließendes Auftragen einer Klarlackschicht sowie Einbrennen der Klarlackschicht.According to the invention, a method for painting a body part of a motor vehicle is provided which comprises the following method steps: performing a cathodic dip coating, then applying a Vorzonenlackschicht as a two-component lacquer layer, wherein the second component is designed as a hardener additive, as a wet-in-wet low-temperature filler without prior drying of cathodic dip coating, subsequent application of a water-dilutable basecoat film as a coloring layer, subsequent application of a clearcoat film and baking of the clearcoat film.

Vorteilig an dem erfindungsgemäß ausgeführten Verfahren ist, dass in diesem Verfahrensschritte aus unterschiedlichen Lackierprozessen miteinander zu einem ganz neuen Lackierverfahren kombiniert werden. Bei dem erfindungsgemäß zu verwendenden Basislack handelt es sich um einen einfachen, in seinem Einsatz weit verbreiteten sowie kostengünstigen Lack, welcher nicht mehr auf den im Lackierprozess verwandten Vorzonenlack abzustimmen ist. Der verwandte Vorzonenlack kann als nass-in-nass-Lack aufgetragen werden, so dass der zuvor aufgetragene Lack nicht zu trocknen braucht. Auch das sich anschließende Auftragen des Basislacks kann quasi unmittelbar nach der Applikation des Vorzonenlacks erfolgen. Dadurch lassen sich gegenüber dem Stand der Technik Warte- beziehungsweise Standzeiten im Lackierprozess drastisch reduzieren.An advantage of the method according to the invention is that in this process steps from different coating processes are combined together to form a completely new coating. The basecoat to be used according to the invention is a simple one, widespread in its use as well as cost-effective paint, which is no longer to vote on the used in the painting process Vorzonenlack. The related Vorzonenlack can be applied as a wet-in-wet paint, so that the previously applied paint does not need to dry. Also, the subsequent application of the basecoat can be done almost immediately after the application of the Vorzonenlacks. As a result, waiting or service life in the painting process can be drastically reduced compared with the state of the art.

In dem Schritt des Auftragens einer Vorzonenlackschicht ist die Vorzonenlackschicht als Zweikomponentenlackschicht ausgeführt. Hierbei handelt es sich bei der zweiten Komponente des Zweikomponentenvorzonenlacks oder auch 2K-Vorzonenlacks um einen Härterzusatz, also um einen Härter beziehungsweise ein Härtemittel, welches dem 2K-Vorzonenlack eine gute Haftung gegenüber der unter ihm liegenden Schicht beziehungsweise den unter ihm liegenden Schichten sowie eine gute Steinschlagbeständigkeit verleiht.In the step of applying a Vorzonenlackschicht the Vorzonenlackschicht is designed as a two-component lacquer layer. This is the second component of the two-component Vorzonenlacks or 2K-Vorzonenlacks to a hardener additive, so a hardener or a hardening agent, which the 2K-Vorzonenlack good adhesion to the underlying layer or under him layers and a good Resistance to stone chips.

Bevorzugt umfasst das Verfahren zur Lackierung eines Karosserieteils eines Kraftfahrzeugs ferner den Schritt des Ablüftens der auf das Karosserieteil aufgetragenen Klarlackschicht. Dadurch kann beispielsweise sichergestellt werden, dass ein frisch aufgetragener Klarlack nicht durch auf die Klarlackierung folgende Prozessschritte verunreinigt wird. Somit kann sichergestellt werden, dass der Klarlack vor der weiteren Bearbeitung des lackierten Karosserieteils trocken ist. Ferner kann dadurch die Gesamtzeit, welche der Lackierprozess des Karosserieteils in Anspruch nimmt, reduziert werden.The method for painting a body part of a motor vehicle preferably also comprises the step of ventilating the clearcoat layer applied to the body part. As a result, it can be ensured, for example, that a freshly applied clearcoat is not contaminated by process steps following the clearcoat. Thus, it can be ensured that the clearcoat is dry before further processing of the painted body part. Furthermore, the total time taken by the painting process of the body part can thereby be reduced.

Des Weiteren bevorzugt umfasst der Schritt des Auftragens einer wasserverdünnbaren Basislackschicht auf das Karosserieteil ferner den Schritt des Zwischentrocknens der wasserverdünnbaren Basislackschicht. Durch eine derartige Zwischentrocknung der auf das Karosserieteil aufgetragenen wasserverdünnbaren Basislackschicht kann unmittelbar auf die Zwischentrocknung die Auftragung eines Klarlacks erfolgen. Dadurch kann die Gesamtzeit, welche der Lackierprozess des Karosserieteils in Anspruch nimmt, abermals reduziert werden.Further preferably, the step of applying a waterborne basecoat layer to the body panel further comprises the step of intermediate drying the waterborne basecoat layer. Such an intermediate drying of the water-dilutable basecoat layer applied to the body part can be followed by the application of a clearcoat material directly to the intermediate drying. As a result, the total time taken by the painting process of the body part can be reduced again.

In einer bevorzugten Ausführungsform des Verfahrens zur Lackierung eines Karosserieteils eines Kraftfahrzeugs stellt in dem Schritt des Auftragens einer wasserverdünnbaren Basislackschicht auf das Karosserieteil der wasserverdünnbare Basislack eine farbgebende Schicht dar. Ferner bevorzugt weist der wasserverdünnbare Basislack organische und/oder anorganische Pigmente auf. Des Weiteren bevorzugt weist der wasserverdünnbare Basislack Kunstharz auf. Ferner bevorzugt weist der wasserverdünnbare Basislack mindestens einen Effektgeber und/oder ein Lösemittel auf. Mit anderen Worten ausgedrückt handelt es sich bei dem eingesetzten, wasserverdünnbaren Basislack um einen in seinem Einsatz weit verbreiteten, kostengünstigen wasserverdünnbaren Basislack, welcher bereits den Farbton beziehungsweise Farbstoff aufweist beziehungsweise bereitstellt, welchen das zu lackierende Karosserieteil nach Beendigung des Verfahrens zur Lackierung eines Karosserieteils eines Kraftfahrzeugs, also nach Beendigung des Lackierprozesses, aufweisen soll. Im Vergleich mit anderen im Stand der Technik eingesetzten Basislacken, beispielsweise mit Ein-oder Zweikomponenten-Basislacken, ist dieser wasserverdünnbare Basislack besonders kostengünstig. Ferner sind für solche einfachen, wasserverdünnbaren Basislacke, insbesondere aufgrund ihrer weiten Verbreitung, weitaus mehr Farbtöne entwickelt und freigegeben als für die speziellen Basislacke anderer Lackierprozesse des Standes der Technik.In a preferred embodiment of the method for painting a body part of a motor vehicle, in the step of applying a water-dilutable basecoat layer to the body part, the waterborne basecoat material is a coloring layer. Further, the waterborne basecoat material preferably comprises organic and / or inorganic pigments. Furthermore, the water-dilutable basecoat preferably comprises synthetic resin. Further preferably, the water-dilutable basecoat comprises at least one effect generator and / or a solvent. In other words, the water-dilutable basecoat used is a cost-effective, water-dilutable basecoat which already has or provides the hue or dye to which the bodywork part to be painted after completion of the process for painting a bodywork part of a motor vehicle , So after completion of the painting process should have. In comparison with other basecoats used in the prior art, for example with one-component or two-component basecoats, this water-dilutable basecoat is particularly cost-effective. Furthermore, for such simple, water-dilutable basecoats, in particular because of their widespread use, far more color shades have been developed and released than for the special basecoats of other coating processes of the prior art.

Ausführungsbeispiele der Erfindung werden anhand der Zeichnung und der nachfolgenden Beschreibung näher erläutert. Es zeigt die einzige

Figur 1
ein Ablaufdiagramm eines Ausführungsbeispiels eines erfindungsgemäßen Verfahrens zur Lackierung eines Karosserieteils eines Kraftfahrzeugs.
Embodiments of the invention will be explained in more detail with reference to the drawing and the description below. It shows the only one
FIG. 1
a flow diagram of an embodiment of a method according to the invention for painting a body part of a motor vehicle.

In der Figur 1 ist ein Ablaufdiagramm eines Ausführungsbeispiels eines erfindungsgemäßen Verfahrens zur Lackierung eines Karosserieteils eines Kraftfahrzeugs dargestellt. Das erfindungsgemäße Verfahren beginnt in diesem Ausführungsbeispiel mit dem Schritt des Durchführens einer kathodischen Tauchlackierung S1, in diesem Ausführungsbeispiel eines Karosserieteils eines Kraftfahrzeugs. Dazu wird das Karosserieteil in diesem Ausführungsbeispiel zur Vorbehandlung vollständig in eine Wanne eingetaucht und auf ein vorbestimmtes elektrisches Potenzial gelegt, welches sich von dem Potenzial einer in der Wanne befindlichen Gegenelektrode unterscheidet. In der Wanne befindet sich in diesem Ausführungsbeispiel ferner ein elektrisch leitfähiger, wässriger Tauchlack, welcher sich, angeregt durch ein Gleichspannungsfeld, welches zwischen der Gegenelektrode und dem Karosserieteil angelegt wird, auf dem Karosserieteil absetzt. Es können allerdings auch erfindungsgemäße Verfahren ausgeführt werden, bei welchen der Schritt des Durchführens einer kathodischen Tauchlackierung S1 auf von der zuvor beschriebenen Art und Weise abweichende Art und Weise erfolgt.In the FIG. 1 a flowchart of an embodiment of a method according to the invention for painting a body part of a motor vehicle is shown. The inventive method begins in this embodiment with the step of performing a cathodic dip paint S1, in this embodiment, a body part of a motor vehicle. For this purpose, the body part is completely submerged in a trough in this embodiment for pretreatment and placed on a predetermined electrical potential, which differs from the potential of a counter electrode located in the tub. In the trough is in this embodiment further comprises an electrically conductive, aqueous dip coat, which, stimulated by a DC field, which is applied between the counter electrode and the body part, settles on the body part. However, it is also possible to carry out methods according to the invention in which the step of carrying out a cathodic dip painting S1 takes place in a manner deviating from the previously described manner.

Im Anschluss an diesen Verfahrensschritt schließt sich in diesem Ausführungsbeispiel der Verfahrensschritt des Auftragens einer Vorzonenlackschicht S3 als nass-in-nass-Niedrigtemperaturfüller auf das zu lackierende Karosserieteil an. Da die Vorzonenlackschicht nass in nass aufgetragen wird, muss keine der Auftragung des Vorzonenlacks vorhergehende Trocknung der während der kathodischen Tauchlackierung aufgetragenen Lackschicht erfolgen. Der Vorzonenlack beziehungsweise die Vorzonenlackschicht wird also unmittelbar auf die noch nicht getrocknete, während der kathodischen Tauchlackierung aufgetragene Lackschicht appliziert. In diesem Ausführungsbeispiel des Verfahrens handelt es sich bei dem Vorzonenlack um einen Zweikomponenten-Vorzonenlack, wobei die zweite Komponente dieses Vorzonenlacks als Härterzusatz ausgeführt ist. Solche Zweikomponenten-Vorzonenlacke können beispielsweise von der Firma DuPont bezogen werden.Subsequent to this method step, in this exemplary embodiment, the method step of applying a pre-zone lacquer layer S3 as a wet-on-wet low-temperature filler is followed by the body part to be painted. Since the pre-zone lacquer layer is applied wet to wet, no drying of the lacquer layer applied during the cathodic dip coating must be carried out prior to application of the pre-zone lacquer. The Vorzonenlack or Vorzonelackschicht is thus applied directly to the not yet dried, applied during the cathodic dip coating paint layer. In this embodiment of the method, the pre-zone lacquer is a two-component pre-zone lacquer, wherein the second component of this pre-zone lacquer is designed as a hardener additive. Such two-component pre-zone coatings can be obtained, for example, from DuPont.

In dem in Figur 1 dargestellten Ablaufdiagramm eines Ausführungsbeispiels eines erfindungsgemäßen Verfahrens zur Lackierung eines Karosserieteils eines Kraftfahrzeugs schließt sich an das Auftragen einer Vorzonenlackschicht S3 das Auftragen einer wasserverdünnbaren Basislackschicht S4 auf das Karosserieteil an. In diesem Ausführungsbeispiel des Verfahrens stellt der wasserverdünnbare Basislack eine farbgebende Schicht dar, weist also denjenigen Farbton auf, welchen das zu lackierende Karosserieteil nach Beendigung des Verfahrens aufweisen soll. In diesem Ausführungsbeispiel weist der wasserverdünnbare Basislack rein beispielhaft einen roten Farbton auf.In the in FIG. 1 illustrated flow diagram of an embodiment of a method according to the invention for painting a body part of a motor vehicle is followed by the application of a Vorzonenlackschicht S3 the application of a water-dilutable basecoat layer S4 on the body part. In this embodiment of the method, the water-dilutable basecoat is a coloring layer, that is to say has the color which the body part to be painted should have after the end of the process. In this embodiment, the water-dilutable basecoat purely by way of example a red color.

Im Anschluss an den Verfahrensschritt des Auftragens einer wasserverdünnbaren Basislackschicht S4 auf das Karosserieteil schließt sich in diesem Ausführungsbeispiel rein beispielhaft der optionale Schritt des Zwischentrocknens S6 der wasserverdünnbaren Basislackschicht an, bei welchem der wasserverdünnbare Basislack vor der Weiterbehandlung des Karosserieteils zunächst getrocknet wird. Es können allerdings auch erfindungsgemäße Verfahren ohne einen derartigen Schritt des Zwischentrocknens S6 der wasserverdünnbaren Basislackschicht ausgeführt werden. An die Zwischentrocknung S6 schließt sich in diesem Ausführungsbeispiel des Verfahrens rein beispielhaft das Auftragen einer Klarlackschicht S2 auf das Karosserieteil sowie das Einbrennen der auf das Karosserieteil aufgetragenen Klarlackschicht an.Subsequent to the method step of applying a water-dilutable basecoat layer S4 to the body part, in this exemplary embodiment the optional step of intermediate drying S6 of the water-dilutable basecoat layer follows, in which the water-dilutable basecoat is first dried prior to the further treatment of the bodywork part. However, it is also possible to carry out processes according to the invention without such a step of intermediate drying S6 of the water-dilutable basecoat film. The intermediate drying S6 in this exemplary embodiment of the method is followed, by way of example, by the application of a clearcoat film S2 to the bodywork part as well as the burning in of the clearcoat film applied to the bodywork part.

Optional kann die Klarlackschicht ebenfalls einen Farbton beziehungsweise einen den Farbton beziehungsweise das Erscheinungsbild des Karosserieteils einstellenden beziehungsweise zumindest beeinflussenden Stoff aufweisen und/oder ein den Farbton beziehungsweise das Erscheinungsbild des Karosserieteils einstellendes beziehungsweise zumindest beeinflussendes Material und/oder eine den Farbton beziehungsweise das Erscheinungsbild des Karosserieteils einstellende beziehungsweise zumindest beeinflussende Komponente aufweisen.Optionally, the clearcoat layer may also have a hue or a substance adjusting or at least influencing the hue or the appearance of the body part and / or a material adjusting or at least influencing the hue or appearance of the body part and / or adjusting the hue or appearance of the body part or at least influencing component.

In diesem Ausführungsbeispiel umfasst das erfindungsgemäße Verfahren des Weiteren optional den Schritt des Ablüftens S5 der auf das Karosserieteil aufgetragenen Klarlackschicht. Allerdings können auch Ausführungsbeispiele von erfindungsgemäßen Verfahren zur Lackierung insbesondere eines Karosserieteils eines Kraftfahrzeugs ausgeführt werden, welche einen solchen Schritt des Ablüftens nicht umfassen. Mit dem Verfahrensschritt des Ablüftens S5 ist das erfindungsgemäße Verfahren in diesem Ausführungsbeispiel rein beispielhaft abgeschlossen. Es können allerdings auch erfindungsgemäße Verfahren ausgeführt werden, welche neben den oben aufgeführten auch noch weitere Verfahrensschritte umfassen und/oder in welchen die oben aufgeführten Verfahrensschritte in einer anderen als der oben dargestellten Reihenfolge ausgeführt werden.In this exemplary embodiment, the method according to the invention furthermore optionally comprises the step of unclamping S5 of the clearcoat layer applied to the bodywork part. However, embodiments of the method according to the invention for painting in particular a body part of a motor vehicle can be carried out, which do not include such a step of venting. With the method step of flash-off S5, the method according to the invention is completed purely by way of example in this exemplary embodiment. However, it is also possible to carry out processes according to the invention which, in addition to those listed above, also comprise further process steps and / or in which the abovementioned process steps are carried out in a sequence other than that shown above.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

S1S1
Durchführen einer kathodischen TauchlackierungPerform a cathodic dip painting
S2S2
Auftragen einer KlarlackschichtApply a clearcoat
S3S3
Auftragen einer VorzonenlackschichtApplying a Vorzonenlackschicht
S4S4
Auftragen einer wasserverdünnbaren BasislackschichtApplying a water-dilutable basecoat
S5S5
Ablüftenflash off
S6S6
Zwischentrocknenbetween dry

Claims (3)

  1. Method for painting a body part of a motor vehicle, which method comprises the following method steps:
    - carrying out of cathodic dip coating (Sl);
    - subsequent application of a preliminary zone paint layer (S3) as a two-component paint layer, the second component being configured as a hardener additive, as a wet-on-wet low temperature filler without preceding drying of the cathodic dip coating;
    - subsequent application of a water-soluble base coat layer (S4) as a chromophoric layer;
    - subsequent application of a clear coat layer (S2) and stoving of the clear coat layer.
  2. Method for painting a body part of a motor vehicle according to Claim 1, the method for painting a body part of a motor vehicle comprising, furthermore, the step of flashing off (S5) of the clear coat layer which is applied to the body part.
  3. Method for painting a body part of a motor vehicle according to either of the preceding claims, the step of the application of a water-soluble base coat layer to the body part (S4) comprising, furthermore, the step of intermediate drying (S6) of the water-soluble base coat layer.
EP14708528.6A 2013-03-23 2014-03-03 Method Revoked EP2976163B1 (en)

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