EP0729390B1 - Repair enamelling process with several layers of enamel - Google Patents

Repair enamelling process with several layers of enamel Download PDF

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Publication number
EP0729390B1
EP0729390B1 EP95900722A EP95900722A EP0729390B1 EP 0729390 B1 EP0729390 B1 EP 0729390B1 EP 95900722 A EP95900722 A EP 95900722A EP 95900722 A EP95900722 A EP 95900722A EP 0729390 B1 EP0729390 B1 EP 0729390B1
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EP
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Prior art keywords
basecoat
coated
composition
aqueous
old
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EP95900722A
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German (de)
French (fr)
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EP0729390A1 (en
Inventor
Hermann Liedtke
Herbert Kortwinkel
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BASF Coatings GmbH
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BASF Coatings GmbH
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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
    • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B05D5/005—Repairing damaged coatings

Definitions

  • Those eligible for a refinish Substrates are either old paint (factory paint or refinishing), primed new parts (mostly ETL primed, especially in the area the painting of truck bodies) as well as steel, aluminum, galvanized sheet or plastic.
  • old paint factory paint or refinishing
  • primed new parts mostly ETL primed, especially in the area the painting of truck bodies
  • steel, aluminum, galvanized sheet or plastic The selection suitable paint materials and the process used aimed at producing a refinish the surface to be painted and the Customer claims.
  • the production of a multi-layer refinish is usually done by thorough cleaning the damaged area, sanding, if necessary filling and applying of a repair filler on the one to be coated Job. In the case of full paintwork, the same is done Pretreatment of the entire old paint to be coated. Then the painting is done prepared area.
  • the present invention was therefore the object Basically, a process for making a refinish to make available with which also at critical shades of refinish with a very good quality. This means that Color changes, cloud formation, etc. avoided should be.
  • Refinish procedures can be obtained at who avoided the common problems or at least be significantly reduced. Especially is common in conventional repair procedures observed cloud formation avoided. Significant is going to get these excellent results too using aqueous metallic basecoats can be achieved.
  • the inventive method for producing a multilayer refinishing can be done on the different substrates can be used.
  • the old paint to receive the refinish prepared. Usually this becomes the old paintwork is first thoroughly cleaned, e.g. with a silicone remover, and with grinding paste or Sanded sandpaper. Then the pre-treated Surface usually cleaned again degreased. In addition, it is also possible to use the old paint for example with an adhesion promoter solution prepaint. This preparation of the old paint is known and therefore does not need to be explained in more detail.
  • an aqueous or water-dilutable or conventional coating agent can then be applied to the correspondingly prepared old paint.
  • highly diluted clear coats are usually applied, which can be both aqueous, water-dilutable and conventional.
  • conventional clear coats they must be predried before the basecoat is applied. This is usually done by heating the clear lacquer layer to a temperature below 140 ° C., preferably below 80 ° C., for a period of 5-60 minutes. If aqueous coating agents are used for this process step, a baking step may be omitted and after a short flash-off time of 5-50 min. the base coating composition can be applied directly.
  • the old paint is pre-sprayed with such a clear coat, it may be possible to dispense with sanding the old paint.
  • the above-described pretreatment of the old paint is done by cleaning and sanding.
  • Aqueous clearcoats suitable for this pretreatment of the old coating are described, for example, in DE-OS-40 09 000.
  • the conventional clearcoats typically used for this purpose such as those sold by Glasurit GmbH, can also be used.
  • the area of the old paint which is adjacent to the previously coated area of the old paint, is again coated with the aqueous basecoat composition in two directly successive spray passes until a limit is reached in accordance with the previous statements.
  • a fender of the car is first coated with the aqueous base coating composition in two successive spray passes.
  • Process step (c) described above is carried out until the entire part to be coated is provided with a base layer. In the example described above, this means, for example, that after the fender has been coated, the adjacent door is again provided with the base layer in 2 spray passes.
  • the flash-off time is usually less than 30 min, particularly preferably a flash-off time of less than 20 min. Without is particularly preferred Flash-off time between the first and second spraying worked.
  • the base coating composition For application of the base coating composition is worked under the usual conditions. This means that for example with a normal or only a slightly reduced spray gun pressure worked becomes.
  • the spray gun inlet pressure is preferably between 3.0 and 4.5 bar.
  • the spray gun outlet pressure varies depending on the used Spray gun. When using an HVLP (high volume, Low Pressure) gun, for example, it is between 0.6 and 0.7 bar.
  • HVLP high volume, Low Pressure
  • basecoats used spray guns suitable for example the above-mentioned HVLP pistols, but also normal pneumatic high-performance spray guns (e.g. SATA-Jet 1.4E).
  • Base coating compositions used as binders contain at least one polyurethane resin. So are, for example, those described in DE-OS-40 09 000 aqueous base coating compositions suitable. Also suitable are those using a mixing system produced aqueous Base coating compositions.
  • a suitable transparent top coating composition upset After forming a polymer film from the basecoat composition, preferably after drying the Base layer at temperatures below 140 ° C, preferred at temperatures below 80 ° C, during a Time of 5-60 min, if necessary after a short cooling time of generally at least 5 min Base layer a suitable transparent top coating composition upset.
  • the dry film thickness the top layer is generally between 30 and 100 ⁇ m.
  • the dry film thickness of the Base layer is generally between 10 and 25 ⁇ m.
  • Clear varnishes are often used based on a hydroxyl-containing acrylate copolymer and a polyisocyanate. Such Clear varnishes are, for example, in the patent applications DE-OS-34 12 534, DE-OS-36 09 519, DE-OS-37 31 652 and DE-OS-38 23 005 described. Also suitable are the in the international patent application with the international Publication number WO 88/02010 described moisture-curing clear lacquers based on Polyaddition polymers with alkoxy or aryloxysilane units.
  • the top layer is then together with the Base layer at temperatures of up to 140 ° C, preferred at temperatures below 100 ° C, and especially preferably at temperatures from 60 to 80 ° C during dried over a period of 5-120 min.
  • multi-layer refinishing come different substrates into consideration, such as B. Old paintwork (factory painting or refinishing) and primed new parts (mostly ETL primed, especially in the area of painting truck bodies).
  • B. Old paintwork factory painting or refinishing
  • primed new parts mostly ETL primed, especially in the area of painting truck bodies.
  • the process for whole-part refinishing used.
  • An electro-primed steel sheet serves as the substrate, which is coated with a commercially available, conventional filler material based on a melamine-crosslinked polyester resin (FC60-7133 from BASF Lacke + Weg, Weg; dry film thickness 40 ⁇ m), a commercially available, conventional metallic basecoat based on cellulose acetobutyrate (AE54-9153 from BASF Lacke + Weg, Weg; dry film thickness 15 ⁇ m) and a commercially available conventional clear coat based on isocyanate-crosslinked hydroxyl-containing acrylates (AF23-0185 from BASF Lacke + Weg, Weg, GmbH; dry film thickness 60 ⁇ m).
  • the coated sheet is additionally stored for several hours at an elevated temperature, for example 60 ° C, and the coating is thus aged.
  • the old paintwork simulated in this way is first cleaned, then roughened with sandpaper and cleaned again.
  • the commercially available 1-component glassohyd® 76-86W basic filler from BASF Lacke + Maschinen AG, Weg, is then applied to the old paint prepared in this way with 2 spray passes in two spray passes and dried at 60 ° C. for 30 minutes. Then the aqueous commercial repair basecoat VW mintmet is applied. VWL-B6 / 00U from BASF Lacke + Maschinen AG, Weg (dry film thickness 15 ⁇ m).
  • the application is carried out by means of the HVLP spray gun (High Volume Low Pressure) spray gun SATA Jet B NR92 (nozzle width 1.3 mm) at a spray gun inlet pressure of 4.5 bar (spray gun outlet pressure 0.7 bar).
  • HVLP spray gun High Volume Low Pressure
  • SATA Jet B NR92 nozzle width 1.3 mm
  • spray gun inlet pressure 4.5 bar
  • spray gun outlet pressure 0.7 bar
  • the coating obtained in this way shows excellent surface properties.
  • the one obtained Coating advantages in terms of cloud formation compared to coatings in which the complete car body in one shot with the Metallic basecoat is coated and only after completion the entire body of the basecoat in a second coat on the whole Body is applied.

Landscapes

  • Application Of Or Painting With Fluid Materials (AREA)
  • Paints Or Removers (AREA)
  • Road Signs Or Road Markings (AREA)
  • Coating With Molten Metal (AREA)

Abstract

PCT No. PCT/EP94/03755 Sec. 371 Date May 20, 1996 Sec. 102(e) Date May 20, 1996 PCT Filed Nov. 12, 1994 PCT Pub. No. WO95/14540 PCT Pub. Date Jun. 1, 1995The present invention relates to a process for the preparation of a multicoat refinish, in which process a metallic basecoat is applied by spraying to the pretreated old finish and dried and then a clearcoat is applied to the basecoat and the clearcoat is dried together with the basecoat. The process is characterized in that the aqueous basecoat composition is applied such that a) in a first spray pass the aqueous basecoat composition is applied to the pretreated area of the old finish until a boundary is reached, b) the area of the old finish coated in step (a) is then coated in a second spray pass with the aqueous basecoat composition, c) steps (a) and (b) of the process are repeated in the region of the old finish which adjoins the previously coated region of the old finish, again until a boundary is reached, and d) process step (c) is carried out until the entire component to be coated is provided with a basecoat.

Description

Gegenstand der vorliegenden Erfindung ist ein Verfahren zur Herstellung einer mehrschichtigen Reparaturlackierung, bei dem

  • 1. die Altlackierung durch Reinigen, Schleifen und ggf. Aufbringen eines Spachtel- und/oder Füllermaterials vorbereitet wird,
  • 2. eine Metallpigmente und/oder Effektpigmente enthaltende, wäßrige Basisbeschichtungszusammensetzung mittels Spritzapplikation aufgebracht wird,
  • 3. aus der in Stufe (2) aufgebrachten Zusammensetzung ein Polymerfilm gebildet wird,
  • 4. auf der so erhaltenen Basisschicht eine geeignete transparente Deckbeschichtungszusammensetzung aufgebracht wird und
  • 5. anschließend die Deckschicht zusammen mit der Basisschicht bei Temperaturen von bis zu 140 °C, bevorzugt bei Temperaturen von unter 100 °C und besonders bevorzugt bei Temperaturen von 60 bis 80 °C getrocknet wird.
    • The present invention relates to a method for producing a multi-layer refinish coating, in which
  • 1. the old paint is prepared by cleaning, sanding and, if necessary, applying a filler and / or filler material,
  • 2. an aqueous base coating composition containing metal pigments and / or effect pigments is applied by spray application,
  • 3. a polymer film is formed from the composition applied in step (2),
  • 4. A suitable transparent top coating composition is applied to the base layer thus obtained and
  • 5. The top layer is then dried together with the base layer at temperatures of up to 140 ° C., preferably at temperatures below 100 ° C. and particularly preferably at temperatures from 60 to 80 ° C.

    • Die für eine Reparaturlackierung in Frage kommenden Untergründe sind entweder eine Altlackierung (Werkslackierung oder Reparaturlackierung), grundierte Neuteile (meistens ETL-grundiert, insbesondere im Bereich der Lackierung von LKW-Aufbauten) sowie Stahl, Aluminium, verzinktes Blech oder Kunststoff. Die Auswahl geeigneter Lackmaterialien und das eingesetzte Verfahren zur Herstellung einer Reparaturlackierung richtet sich nach der zu lackierenden Oberfläche und den Forderungen des Kunden.Those eligible for a refinish Substrates are either old paint (factory paint or refinishing), primed new parts (mostly ETL primed, especially in the area the painting of truck bodies) as well as steel, aluminum, galvanized sheet or plastic. The selection suitable paint materials and the process used aimed at producing a refinish the surface to be painted and the Customer claims.

    Die Herstellung einer mehrschichtigen Reparaturlackierung erfolgt üblicherweise durch gründliches Reinigen der Schadstelle, Schleifen, ggf. Spachteln und Aufbringen eines Reparaturfüllers auf der zu beschichtenden Stelle. Im Falle von Ganzlackierungen erfolgt die analoge Vorbehandlung der gesamten, zu beschichtenden Altlackierung. Anschließend erfolgt eine Lackierung der so vorbereiteten Fläche.The production of a multi-layer refinish is usually done by thorough cleaning the damaged area, sanding, if necessary filling and applying of a repair filler on the one to be coated Job. In the case of full paintwork, the same is done Pretreatment of the entire old paint to be coated. Then the painting is done prepared area.

    Insbesondere die Herstellung von Metallic-Reparaturlackierungen ist dabei aber problematisch, da Farbton und Helligkeit des Effektes stark von der Verarbeitungsweise abhängen. Hier spielen u.a. die Düsenweite der Spritzpistole und der Spritzdruck eine entscheidende Rolle. Auch die Art der Verdünnung und die Spritzviskosität beeinflussen Farbton und Effekt. Insbesondere bei Verwendung von wäßrigen Basisbeschichtungszusammensetzung werden häufig Wolkenbildung und ähnliche Effekte beobachtet.In particular the production of metallic refinish paints is problematic because of the color and brightness of the effect strongly from the processing way depend. Here, among other things, the nozzle width the spray gun and the spray pressure are crucial Role. Also the type of dilution and the spray viscosity affect hue and effect. Especially when using aqueous base coating composition are often cloud formation and the like Effects observed.

    Der vorliegenden Erfindung lag somit die Aufgabe zu Grunde, ein Verfahren zur Herstellung einer Reparaturlackierung zur Verfügung zu stellen, mit dem auch bei kritischen Farbtönen Reparaturlackierungen mit einer sehr guten Qualität erhalten werden. Dies bedeutet, daß Farbtonveränderungen, Wolkenbildung u.ä. vermieden werden sollten.The present invention was therefore the object Basically, a process for making a refinish to make available with which also at critical shades of refinish with a very good quality. This means that Color changes, cloud formation, etc. avoided should be.

    Diese Aufgabe wird überraschenderweise durch ein Verfahren der eingangs genannten Art gelöst, das dadurch gekennzeichnet ist, daß in Stufe (2) des Verfahrens die wäßrige Basisbeschichtungszusammensetzung derart aufgebracht wird, daß

  • a) in einem ersten Spritzgang die wäßrige Basisbeschichtungszusammensetzung bis zum Erreichen einer Begrenzung auf die vorbereitete Fläche der Altlackierung aufgebracht wird,
  • b) die in Stufe (a) beschichtete Fläche der Altlackierung dann in einem weiteren Spritzgang mit der wäßrigen Basisbeschichtungszusammensetzung beschichtet wird,
  • c) die Stufen (a) und (b) des Verfahrens in dem Bereich der Altlackierung, der an den zuvor beschichteten Bereich der Altlackierung angrenzt, wiederum bis zum Erreichen einer Begrenzung wiederholt werden und
  • d) der Verfahrensschritt (c) so lange durchgeführt wird, bis das gesamte zu beschichtende Teil mit einer Basisschicht versehen ist.
    • This object is surprisingly achieved by a process of the type mentioned at the outset, which is characterized in that in step (2) of the process the aqueous base coating composition is applied in such a way that
  • a) in a first spraying step, the aqueous base coating composition is applied until a limit is reached on the prepared surface of the old paint,
  • b) the surface of the old coating coated in step (a) is then coated in a further spraying step with the aqueous base coating composition,
  • c) the steps (a) and (b) of the process in the area of the old paint, which adjoins the previously coated area of the old paint, are again repeated until a limit is reached, and
  • d) the process step (c) is carried out until the entire part to be coated is provided with a base layer.

    • Überraschenderweise können mit dem erfindungsgemäßen Verfahren Reparaturlackierungen erhalten werden, bei denen die üblicherweise auftretenden Probleme vermieden bzw. zumindest deutlich verringert werden. Insbesondere wird die bei den herkömmlichen Reparaturverfahren häufig beobachtete Wolkenbildung vermieden. Von Bedeutung ist dabei, daß diese hervorragenden Ergebnisse auch unter Verwendung von wäßrigen Metallic-Basislacken erzielt werden können. Vorteilhaft ist ferner die Zeitersparnis, die dadurch bedingt ist, daß zwischen dem ersten und zweiten Spritzgang nur eine kurze Ablüftzeit und besonders bevorzugt gar keine Ablüftzeit liegt. Surprisingly, with the invention Refinish procedures can be obtained at who avoided the common problems or at least be significantly reduced. Especially is common in conventional repair procedures observed cloud formation avoided. Significant is going to get these excellent results too using aqueous metallic basecoats can be achieved. The is also advantageous Time saving, which is due to the fact that between only a short one after the first and second spraying Flash-off time and particularly preferably no flash-off time lies.

    Das erfindungsgemäße Verfahren zur Herstellung einer mehrschichtigen Reparaturlackierung kann dabei auf den unterschiedlichsten Substraten angewendet werden. Dabei ist es unerheblich, ob es sich um konventionelle oder wasserverdünnbare Aufbauten handelt, die mit der Reparaturlackierung versehen werden sollen.The inventive method for producing a multilayer refinishing can be done on the different substrates can be used. Here it is irrelevant whether it is conventional or water-dilutable superstructures deals with the refinishing should be provided.

    Zur Durchführung des erfinderungsgemäßen Verfahrens wird zunächst die Altlackierung zur Aufnahme der Reparaturlackierung vorbereitet. Üblicherweise wird dazu die Altlackierung zunächst gründlich gereinigt, z.B. mit einem Silikonentferner, und mit Schleifpaste oder Schleifpapier angerauht. Danach wird die so vorbehandelte Fläche üblicherweise noch einmal gereinigt und entfettet. Daneben ist es aber auch möglich, die Altlackierung beispielsweise mit einer Haftvermittlerlösung vorzulackieren. Diese Vorbereitung der Altlackierung ist aber bekannt und braucht daher nicht näher erläutert zu werden.To carry out the method according to the invention first the old paint to receive the refinish prepared. Usually this becomes the old paintwork is first thoroughly cleaned, e.g. with a silicone remover, and with grinding paste or Sanded sandpaper. Then the pre-treated Surface usually cleaned again degreased. In addition, it is also possible to use the old paint for example with an adhesion promoter solution prepaint. This preparation of the old paint is known and therefore does not need to be explained in more detail.

    Ggf. kann anschließend auf die entsprechend vorbereitete Altlackierung ein wäßriges oder wasserverdünnbares oder auch konventionelles Überzugsmittel aufgebracht werden.
    Für diesen Arbeitsgang werden üblicherweise stark verdünnte Klarlacke appliziert, die sowohl wäßrig, wasserverdünnbar als auch konventionell sein können. Werden konventionelle Klarlacke appliziert, so muß vorgetrocknet werden, ehe der Basislack aufgebracht wird. Üblicherweise erfolgt dies durch Erwärmen der Klarlackschicht auf eine Temperatur von unter 140 °C, bevorzugt von unter 80 °C, während einer Zeit von 5-60 min. Werden für diesen Verfahrensschritt wäßrige Überzugsmittel eingesetzt, so kann ggf. auf einen Einbrennschritt verzichtet werden und es kann nach einer kurzen Ablüftzeit von 5-50 min. direkt die Basisbeschichtungszusammensetzung aufgebracht werden. Wenn die Altlackierung mit einem derartigen Klarlack vorgespritzt wird, so kann ggf. auf ein Anschleifen der Altlackierung verzichtet werden. Üblicherweise jedoch erfolgt die obenbeschriebene Vorbehandlung der Altlackierung durch Reinigen und Anschleifen.
    Für diese Vorbehandlung der Altlackierung geeignete wäßrige Klarlacke sind beispielsweise in der DE-OS-40 09 000 beschrieben. Daneben können aber auch die für diesen Zweck üblicherweise eingesetzten konventionellen Klarlacke, wie sie beispielsweise von der Firma Glasurit GmbH vertrieben werden, eingesetzt werden.    Possibly. an aqueous or water-dilutable or conventional coating agent can then be applied to the correspondingly prepared old paint.
    For this operation, highly diluted clear coats are usually applied, which can be both aqueous, water-dilutable and conventional. If conventional clear coats are applied, they must be predried before the basecoat is applied. This is usually done by heating the clear lacquer layer to a temperature below 140 ° C., preferably below 80 ° C., for a period of 5-60 minutes. If aqueous coating agents are used for this process step, a baking step may be omitted and after a short flash-off time of 5-50 min. the base coating composition can be applied directly. If the old paint is pre-sprayed with such a clear coat, it may be possible to dispense with sanding the old paint. Usually, however, the above-described pretreatment of the old paint is done by cleaning and sanding.
    Aqueous clearcoats suitable for this pretreatment of the old coating are described, for example, in DE-OS-40 09 000. In addition, however, the conventional clearcoats typically used for this purpose, such as those sold by Glasurit GmbH, can also be used.

    Es ist erfindungswesentlich, daß auf die entsprechend vorbereitete Altlackierung nun eine Metall- und/oder Effektpigmente enthaltende Basisbeschichtungszusammensetzung mittels einer speziellen Applikationstechnik aufgebracht wird.It is essential to the invention that the corresponding prepared old paint now a metal and / or Base coating composition containing effect pigments using a special application technique is applied.

    Bei dem erfindungsgemäßen Verfahren wird zunächst die wäßrige Basisbeschichtungszusammensetzung in einem ersten Spritzgang auf die vorbereitete Altlackierung bis zum Erreichen einer Begrenzung aufgebracht. Daran anschließend wird direkt (d.h. ohne Zwischentrocknung) auf die zuvor beschichteten Teile der Altlackierung die wäßrige Basisbeschichtungszusammensetzung in einem zweiten Spritzgang appliziert und zwar wiederum bis zum Erreichen der Begrenzung. Dies bedeutet, daß beispielsweise zunächst das komplette Dach eines PKW's in einem ersten Spritzgang mit der wäßrigen Basisbeschichtungszusammensetzung beschichtet wird. Daran anschließend wird dann direkt das Dach noch einmal in einem zweiten Spritzgang mit der wäßrigen Basisbeschichtungszusammensetzung beschichtet. In the method according to the invention, the aqueous base coating composition in one first spraying on the prepared old paint applied until a limit is reached. That then directly (i.e. without intermediate drying) on the previously coated parts of the old paint aqueous base coating composition in one second spray applied and again until Reaching the limit. This means that for example first the complete roof of a car in one first spray coat with the aqueous base coating composition is coated. After that the roof is then once again in a second Spraying with the aqueous base coating composition coated.

    Im nächsten Schritt des erfindungsgemäßen Verfahrens wird der Bereich der Altlackierung, der an den zuvor beschichteten Bereich der Altlackierung angrenzt, wiederum bis zum Erreichen einer Begrenzung entsprechend den vorherigen Ausführungen in zwei direkt aufeinander folgenden Spritzgängen mit der wäßrigen Basisbeschichtungszuammensetzung beschichtet. Dies bedeutet beispielsweise, daß nach der obenbeschriebenen Beschichtung des Daches nun zunächst ein Kotflügel des PKW's in zwei direkt aufeinander folgenden Spritzgängen mit der wäßrigen Basisbeschichtungszusammensetzung beschichtet wird.
    Der zuvor beschriebene Verfahrensschritt (c) wird so lange durchgeführt, bis das gesamte zu beschichtende Teil mit einer Basisschicht versehen ist. Im obenbeschriebenen Beispiel bedeutet das z.B., daß nach der Beschichtung des Kotflügels nun die angrenzende Tür wiederum in 2 Spritzgängen mit der Basisschicht versehen wird.    In the next step of the method according to the invention, the area of the old paint, which is adjacent to the previously coated area of the old paint, is again coated with the aqueous basecoat composition in two directly successive spray passes until a limit is reached in accordance with the previous statements. This means, for example, that after coating the roof as described above, a fender of the car is first coated with the aqueous base coating composition in two successive spray passes.
    Process step (c) described above is carried out until the entire part to be coated is provided with a base layer. In the example described above, this means, for example, that after the fender has been coated, the adjacent door is again provided with the base layer in 2 spray passes.

    Dieser Verfahrensschritt der Teil- für Teil-Beschichtung mit der Basisbeschichtungszusammensetzung wird so lange wiederholt, bis das gesamte zu beschichtende Teil mit der Basisschicht beschichtet ist.This part-by-part process step with the base coating composition long repeated until the entire part to be coated is coated with the base layer.

    Zwischen dem ersten Spritzgang der Basisbeschichtungszusammensetzung und dem daran anschließenden zweiten Spritzgang der wäßrigen Basisbeschichtungszusammensetzung liegt üblicherweise eine Ablüftzeit von weniger als 30 min, besonders bevorzugt eine Ablüftzeit von weniger als 20 min. Ganz besonders bevorzugt wird ohne Ablüftzeit zwischen dem ersten und dem zweiten Spritzgang gearbeitet.Between the first coat of the basecoat composition and the second one after that Spraying the aqueous base coating composition the flash-off time is usually less than 30 min, particularly preferably a flash-off time of less than 20 min. Without is particularly preferred Flash-off time between the first and second spraying worked.

    Zur Applikation der Basisbeschichtungszusammensetzung wird unter den üblichen Bedingungen gearbeitet. Dies bedeutet, daß beispielsweise mit einem normalen oder nur einem leicht reduzierten Spritzpistolendruck gearbeitet wird. Bevorzugt liegt der Spritzpistoleneingangsdruck zwischen 3,0 und 4,5 bar. Der Spritzpistolenausgangsdruck variiert dabei je nach verwendeter Spritzpistole. Bei Verwendung einer HVLP- (High Volume, Low Pressure) Pistole liegt er beispielsweise zwischen 0,6 und 0,7 bar. Für die Applikation der Basisbeschichtungszusammensetzung sind alle üblicherweise für die Applikation von Basislacken eingesetzten Spritzpistolen geeignet, beispielsweise die obengenannten HVLP-Pistolen, aber auch normale pneumatische Hochleistungsspritzpistolen (z.B. SATA-Jet 1,4E).For application of the base coating composition is worked under the usual conditions. This means that for example with a normal or only a slightly reduced spray gun pressure worked becomes. The spray gun inlet pressure is preferably between 3.0 and 4.5 bar. The spray gun outlet pressure varies depending on the used Spray gun. When using an HVLP (high volume, Low Pressure) gun, for example, it is between 0.6 and 0.7 bar. For the application of the base coating composition are all usually for that Application of basecoats used spray guns suitable, for example the above-mentioned HVLP pistols, but also normal pneumatic high-performance spray guns (e.g. SATA-Jet 1.4E).

    Für dieses Verfahren geeignet sind alle üblicherweise für die Reparaturlackierung eingesetzten Metall- und/oder Effektpigmente enthaltenden wäßrigen Basisbeschichtungszusammensetzungen. Geeignet sind insbesondere Basisbeschichtungszusammensetzungen, die als Bindemittel mindestens ein Polyurethanharz enthalten. So sind beispielsweise die in der DE-OS-40 09 000 beschriebenen wäßrigen Basisbeschichtungszusammensetzungen geeignet. Geeignet sind ferner auch die unter Verwendung eines Mischsystems hergestellten wäßrigen Basisbeschichtungszusammensetzungen.All are usually suitable for this method metal and / or used for the refinishing Aqueous base coating compositions containing effect pigments. Are particularly suitable Base coating compositions used as binders contain at least one polyurethane resin. So are, for example, those described in DE-OS-40 09 000 aqueous base coating compositions suitable. Also suitable are those using a mixing system produced aqueous Base coating compositions.

    Beispielsweise sind die unter Verwendung des in der DE-OS-41 10 520, der nicht vorveröffentlichten Deutschen Patentanmeldung P 42 32 721.0 und der nicht vorveröffentlichten Deutschen Patentanmeldung P 42 32 717.2 beschriebenen, unter Verwendung eines Mischsystems hergestellten, wäßrigen Basisbeschichtungszusammensetzungen geeignet.For example, those using the in the DE-OS-41 10 520, the not pre-published German patent application P 42 32 721.0 and not Pre-published German patent application P 42 32 717.2 described, using a Mixing system produced, aqueous base coating compositions suitable.

    Nach Bildung eines Polymerfilms aus der Basisbeschichtungszusammensetzung, bevorzugt nach Trocknung der Basisschicht bei Temperaturen von unter 140 °C, bevorzugt bei Temperaturen von unter 80 °C, während einer Zeit von 5-60 min, ggf. nach einer kurzen Abkühlzeit von im allgemeinen mindestens 5 min, wird auf der Basisschicht eine geeignete transparente Deckbeschichtungszusammensetzung aufgebracht. Die Trockenfilmschichtdicke der Deckschicht liegt im allgemeinen zwischen 30 und 100 µm. Die Trockenfilmschichtdicke der Basisschicht liegt im allgemeinen zwischen 10 und 25 µm.After forming a polymer film from the basecoat composition, preferably after drying the Base layer at temperatures below 140 ° C, preferred at temperatures below 80 ° C, during a Time of 5-60 min, if necessary after a short cooling time of generally at least 5 min Base layer a suitable transparent top coating composition upset. The dry film thickness the top layer is generally between 30 and 100 µm. The dry film thickness of the Base layer is generally between 10 and 25 µm.

    Als Deckbeschichtungszusammensetzung geeignet sind sowohl organisch gelöste als auch wäßrige 1- oder 2-Komponenten-Klarlacke. Häufig eingesetzt werden Klarlacke auf Basis eines hydroxylgruppenhaltigen Acrylatcopolymerisates und eines Polyisocyanates. Derartige Klarlacke sind beispielsweise in den Patentanmeldungen DE-OS-34 12 534, DE-OS-36 09 519, DE-OS-37 31 652 und DE-OS-38 23 005 beschrieben. Geeignet sind auch die in der internationalen Patentanmeldung mit der internationalen Veröffentlichungsnummer WO 88/02010 beschriebenen, feuchtigkeitshärtenden Klarlacke auf Basis von Polyadditionspolymeren mit Alkoxi- oder Aryloxisilaneinheiten.Are suitable as a top coating composition both organically dissolved and aqueous 1- or 2-component clear coats. Clear varnishes are often used based on a hydroxyl-containing acrylate copolymer and a polyisocyanate. Such Clear varnishes are, for example, in the patent applications DE-OS-34 12 534, DE-OS-36 09 519, DE-OS-37 31 652 and DE-OS-38 23 005 described. Also suitable are the in the international patent application with the international Publication number WO 88/02010 described moisture-curing clear lacquers based on Polyaddition polymers with alkoxy or aryloxysilane units.

    Nach einer ggf. erforderlichen Ablüftzeit von etwa 5 min wird dann die Deckschicht ggf. zusammen mit der Basisschicht bei Temperaturen von bis zu 140 °C, bevorzugt bei Temperaturen von unter 100 °C, und besonders bevorzugt bei Temperaturen von 60 bis 80 °C während einer Zeit von 5-120 min getrocknet.After a necessary flash-off time of approx The top layer is then together with the Base layer at temperatures of up to 140 ° C, preferred at temperatures below 100 ° C, and especially preferably at temperatures from 60 to 80 ° C during dried over a period of 5-120 min.

    Als Untergrund für die Herstellung der erfindungsgemäßen mehrschichtigen Reparaturlackierung kommen die unterschiedlichsten Untergründe in Betracht, wie z. B. Altlackierungen (Werkslackierung oder Reparaturlackierung) und grundierte Neuteile (meistens ETL-grundiert, insbesondere im Bereich der Lackierung von Lkw-Aufbauten). Insbesondere wird das Verfahren für die Ganzteil-Reparaturlackierung eingesetzt.As a base for the production of the invention multi-layer refinishing come different substrates into consideration, such as B. Old paintwork (factory painting or refinishing) and primed new parts (mostly ETL primed, especially in the area of painting truck bodies). In particular, the process for whole-part refinishing used.

    Die Erfindung wird nun in den nachfolgenden Beispielen näher erläutert. Alle Angaben über Teile und Prozente sind dabei Gewichtsangaben, sofern nicht ausdrücklich etwas anderes festgestellt wird. Als Substrat wird dabei eine mehrschichtige simulierte Altlackierung verwendet, wie sie in der Automobilserienlackierung üblich ist. Dabei ist es unerheblich, ob es sich um Lackaufbauten auf der Basis konventioneller oder wasserverdünnbarer Systeme handelt.The invention will now be described in the following examples explained in more detail. All information about parts and percentages are weights, unless expressly stated something else is found. As a substrate used a multi-layer simulated old paint job, as usual in automotive OEM painting is. It is irrelevant whether it is paint structures based on conventional or water-dilutable Systems.

    Simulierung einer AltlackierungSimulation of an old paint job

    Als Substrat dient ein elektrotauchgrundiertes Stahlblech, das mit einem handelsüblichen, konventionellen Füllermaterial auf Basis eines melaminvernetzten Polyesterharzes (FC60-7133 der Firma BASF Lacke + Farben AG, Münster; Trockenfilmschichtdicke 40 µm), einem handelsüblichen, konventionellen Metallicbasislack auf Basis Celluloseacetobutyrat (AE54-9153 der Firma BASF Lacke + Farben AG, Münster; Trockenfilmschichtdicke 15 µm) und einem handelsüblichen konventionellen Klarlack auf Basis isocyanatvernetzter hydroxylgruppenhaltiger Acrylate (AF23-0185 der Firma BASF Lacke + Farben AG, Münster; Trockenfilmschichtdicke 60 µm) versehen ist. Nach der üblichen Trocknung (60 °C, 30 min) wird das beschichtete Blech zusätzlich für mehrere Stunden bei erhöhter Temperatur, z.B. 60 °C, gelagert und damit die Lackierung gealtert.
    Die so simulierte Altlackierung wird zunächst gereinigt, dann mit Schleifpapier angerauht und nochmals gereinigt. Auf die so vorbereitete Altlackierung wird nun mit 2 Spritzgängen der handelsübliche 1-K-Grundfüller Glassohyd® 76-86W der Firma BASF Lacke + Farben AG, Münster in 2 Spritzgängen aufgebracht und 30 min bei 60 °C getrocknet. Danach erfolgt die Applikation des wäßrigen handelsüblichen Reparaturbasislacks VW mintmet. VWL-B6/00U der Firma BASF Lacke + Farben AG, Münster (Trockenfilmschichtdicke 15 µm). Die Applikation erfolgt mittels der HVLP-Spritzpistole (High Volume Low Pressure) Spritzpistole SATA Jet B NR92 (Düsenweite 1,3 mm) bei einem Spritzpistoleneingangsdruck von 4,5 bar (Spritzpistolenausgangsdruck 0,7 bar). Zur Beschichtung der mit der obenbeschriebenen Altlackierung versehenen Pkw-Karosserie wird zunächst in 2 Spritzgängen das Dach fertiggespritzt, dann mit 2 Spritzgängen am Kotflügel angefangen und dieser mit 2 Spritzgängen fertiggespritzt. Dann wird das nächste Teil (beispielsweise Tür) mit 2 Spritzgängen fertiggespritzt.    An electro-primed steel sheet serves as the substrate, which is coated with a commercially available, conventional filler material based on a melamine-crosslinked polyester resin (FC60-7133 from BASF Lacke + Farben AG, Münster; dry film thickness 40 µm), a commercially available, conventional metallic basecoat based on cellulose acetobutyrate (AE54-9153 from BASF Lacke + Farben AG, Münster; dry film thickness 15 µm) and a commercially available conventional clear coat based on isocyanate-crosslinked hydroxyl-containing acrylates (AF23-0185 from BASF Lacke + Farben AG, Münster; dry film thickness 60 µm). After the usual drying (60 ° C, 30 min), the coated sheet is additionally stored for several hours at an elevated temperature, for example 60 ° C, and the coating is thus aged.
    The old paintwork simulated in this way is first cleaned, then roughened with sandpaper and cleaned again. The commercially available 1-component glassohyd® 76-86W basic filler from BASF Lacke + Farben AG, Münster, is then applied to the old paint prepared in this way with 2 spray passes in two spray passes and dried at 60 ° C. for 30 minutes. Then the aqueous commercial repair basecoat VW mintmet is applied. VWL-B6 / 00U from BASF Lacke + Farben AG, Münster (dry film thickness 15 µm). The application is carried out by means of the HVLP spray gun (High Volume Low Pressure) spray gun SATA Jet B NR92 (nozzle width 1.3 mm) at a spray gun inlet pressure of 4.5 bar (spray gun outlet pressure 0.7 bar). To coat the car body with the old paint described above, the roof is first sprayed in 2 spray coats, then it is started with 2 spray coats on the fender and this is sprayed with 2 spray coats. Then the next part (e.g. door) is sprayed with 2 spray coats.

    Mit diesem Verfahren wird so lange Teil für Teil fortgefahren, bis die gesamte Karosserie fertig mit dem Basislack beschichtet ist. Danach wird die Basisschicht 10 min bei 60 °C getrocknet und 5 min abkühlen gelassen. Danach wird auf die Basisschicht der handelsübliche 2-K-Klarlack auf Basis isocyanatvernetzter hydroxylgruppenhaltiger Acrylate (AF 23-0185 plus SC 29-0173 plus SV 41-0391 der Firma BASF Lacke + Farben AG, Münster; Mischungsverhältnis 2:1:0,6) appliziert. Der Klarlack wird dabei mit einer Trockenfilmschichtdicke von 60 µm aufgetragen. Nach einer kurzen Ablüftzeit von 5 min wird anschließend die Deckschicht bei 60 °C 30 min getrocknet.This process continues part by part as long as until the entire body is done with the Basecoat is coated. After that, the base layer Dried at 60 ° C for 10 min and allowed to cool for 5 min. After that, the commercial layer is applied to the base layer 2-component clear lacquer based on isocyanate-crosslinked hydroxyl groups Acrylates (AF 23-0185 plus SC 29-0173 plus SV 41-0391 from BASF Lacke + Farben AG, Munster; Mixing ratio 2: 1: 0.6) applied. The clearcoat comes with a dry film thickness of 60 µm applied. After a short The top layer is then flashed off for 5 minutes dried at 60 ° C for 30 min.

    Die so erhaltene Beschichtung zeigt hervorragende Oberflächeneigenschaften. Insbesondere zeigt die erhaltene Beschichtung Vorteile in bezug auf die Wolkenbildung, verglichen mit Beschichtungen, bei denen zunächst die komplette Pkw-Karosserie in einem Spritzgang mit dem Metallicbasislack beschichtet wird und erst nach Fertigstellung der gesamten Karosserie der Basislack in einem zweiten Spritzgang wiederum auf die gesamte Karosserie appliziert wird.The coating obtained in this way shows excellent surface properties. In particular, the one obtained Coating advantages in terms of cloud formation, compared to coatings in which the complete car body in one shot with the Metallic basecoat is coated and only after completion the entire body of the basecoat in a second coat on the whole Body is applied.

    Claims (5)

    1. Process for the preparation of a multicoat refinish, in which
      1. the old finish is prepared by cleaning, sanding and, if desired, applying a surfacer and/or filler material,
      2. an aqueous basecoat composition is applied, by means of spray application, which contains metallic pigments and/or effect pigments,
      3. a polymer film is formed from the composition applied in step (2),
      4. a suitable transparent topcoat composition is applied to the resulting basecoat, and
      5. subsequently the topcoat together with the basecoat is dried at temperatures of up to 140°C, preferably at temperatures below 100°C and particularly preferably at temperatures of from 60 to 80°C,
      characterized in that in step (2) of the process the aqueous basecoat composition is applied such that
      a) in a first spray pass the aqueous basecoat composition is applied to the pretreated area of the old finish until a boundary is reached,
      b) the area of the old finish coated in step (a) is then coated in a second spray pass with the aqueous basecoat composition,
      c) steps (a) and (b) of the process are repeated in the region of the old finish which adjoins the previously coated region of the old finish, again until a boundary is reached, and
      d) process step (c) is carried out until the entire component to be coated is provided with a basecoat.
    2. Process according to Claim 1, characterized in that between the application of the basecoat composition in the first spray pass (a) and in the second spray pass (b) there is a flash-off time of < 30 min, preferably no flash-off time.
    3. Process according to Claim 1 or 2, characterized in that a polymer film is formed from the basecoat composition applied in step (2) by the basecoat being dried at temperatures of below 140°C, preferably below 80°C, for a period of from 5 to 60 min.
    4. Process according to one of Claims 1 to 3, characterized in that an aqueous basecoat composition is employed which contains as binder at least one polyurethane resin.
    5. Process according to one of Claims 1 to 4, characterized in that an automotive refinish is prepared.
    EP95900722A 1993-11-20 1994-11-12 Repair enamelling process with several layers of enamel Expired - Lifetime EP0729390B1 (en)

    Applications Claiming Priority (3)

    Application Number Priority Date Filing Date Title
    DE4339612 1993-11-20
    DE4339612A DE4339612A1 (en) 1993-11-20 1993-11-20 Process for producing a multi-layer refinish
    PCT/EP1994/003755 WO1995014540A1 (en) 1993-11-20 1994-11-12 Repair enamelling process with several layers of enamel

    Publications (2)

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    EP0729390A1 EP0729390A1 (en) 1996-09-04
    EP0729390B1 true EP0729390B1 (en) 1998-09-16

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    EP (1) EP0729390B1 (en)
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    US6221441B1 (en) 1999-05-26 2001-04-24 Ppg Industries Ohio, Inc. Multi-stage processes for coating substrates with liquid basecoat and powder topcoat
    US7011869B2 (en) * 1999-05-26 2006-03-14 Ppg Industries Ohio, Inc. Multi-stage processes for coating substrates with multi-component composite coating compositions
    US6113764A (en) * 1999-05-26 2000-09-05 Ppg Industries Ohio, Inc. Processes for coating a metal substrate with an electrodeposited coating composition and drying the same
    US6291027B1 (en) 1999-05-26 2001-09-18 Ppg Industries Ohio, Inc. Processes for drying and curing primer coating compositions
    US6596347B2 (en) 1999-05-26 2003-07-22 Ppg Industries Ohio, Inc. Multi-stage processes for coating substrates with a first powder coating and a second powder coating
    US6863935B2 (en) 1999-05-26 2005-03-08 Ppg Industries Ohio, Inc. Multi-stage processes for coating substrates with multi-component composite coating compositions
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    DE10124277A1 (en) * 2001-05-18 2002-11-28 Basf Coatings Ag Aqueous multi-component system, contains at least one binder containing saturated, unsaturated, and/or grafted with olefinically unsaturated compounds ionically and/or nonionically stabilized polyurethane, and crosslinking agent
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    ATE171090T1 (en) 1998-10-15
    ES2124517T3 (en) 1999-02-01
    DE59406940D1 (en) 1998-10-22
    JPH09506292A (en) 1997-06-24
    US5871809A (en) 1999-02-16
    DK0729390T3 (en) 1999-06-14
    WO1995014540A1 (en) 1995-06-01
    EP0729390A1 (en) 1996-09-04
    BR9408088A (en) 1997-08-12

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