EP0891817A2 - Method for electrostatic coating - Google Patents

Method for electrostatic coating Download PDF

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Publication number
EP0891817A2
EP0891817A2 EP98111127A EP98111127A EP0891817A2 EP 0891817 A2 EP0891817 A2 EP 0891817A2 EP 98111127 A EP98111127 A EP 98111127A EP 98111127 A EP98111127 A EP 98111127A EP 0891817 A2 EP0891817 A2 EP 0891817A2
Authority
EP
European Patent Office
Prior art keywords
applicators
particles
charge
powder
electrical charge
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.)
Withdrawn
Application number
EP98111127A
Other languages
German (de)
French (fr)
Other versions
EP0891817A3 (en
Inventor
Gunter Dr.-Ing. Börner
Hans Christoph Dr. Rer.Nat. Dipl.-Chem. Nienburg
Jörg Dr. rer.nat. Sopka
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.)
ABB Research Ltd Switzerland
Original Assignee
ABB Research Ltd Switzerland
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 ABB Research Ltd Switzerland filed Critical ABB Research Ltd Switzerland
Publication of EP0891817A2 publication Critical patent/EP0891817A2/en
Publication of EP0891817A3 publication Critical patent/EP0891817A3/en
Withdrawn legal-status Critical Current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
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/002—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means comprising means for neutralising the spray of charged droplets or particules
    • B05B5/003—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means comprising means for neutralising the spray of charged droplets or particules by mixing two sprays of opposite polarity
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/002—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means comprising means for neutralising the spray of charged droplets or particules
    • B05B5/004—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means comprising means for neutralising the spray of charged droplets or particules by alternating the polarity of the spray
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/025—Discharge apparatus, e.g. electrostatic spray guns
    • 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
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
    • B05D1/04—Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field
    • B05D1/06—Applying particulate materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/025—Discharge apparatus, e.g. electrostatic spray guns
    • B05B5/047—Discharge apparatus, e.g. electrostatic spray guns using tribo-charging

Definitions

  • the invention relates to a method for the electrostatic coating of Workpieces with powder materials.
  • Layer thickness is generally less than 500 ⁇ m because the charge already applied powder particles to subsequent powder particles of the same name repulsive. For many technical applications, for example electrical or thermal insulation layers, the layer thickness that can be achieved in this way is not sufficient. A multiple coating with layer internal is then necessary.
  • the invention has for its object to provide a method with which in a Working step a desired greater layer thickness can be achieved.
  • Powder spraying devices suitable for carrying out the method are, for example known from DE 195 42 863 A1.
  • a simultaneous or alternating Spraying of positively charged powder and negatively charged powder can by arranging at least one corona spray gun and at least one tribo spray gun can be achieved.
  • one is earthed Workpiece arranged and there are at least two applicators 1, 2.
  • Figure 1 shows a first method variant in which a one-component coating material 1 by means of two electrostatic, referred to as applicators 1, 2 Application equipment is applied.
  • the applicator 1 sprays positively charged particles of the coating material 1 and the applicator 2 negatively charged particles the workpiece.
  • the applicators 1, 2 work simultaneously. Instead of two applicators can also use several applicators with different particles Apply cargo. By the simultaneous deposition of particles of different electrical charge, the surface charge is lower than with a coating with particles of only one charge. The achievable powder layer thickness is thereby higher.
  • FIG. 2 shows a second variant, two applicators 1, 2 likewise being used simultaneously spray, but a first material component, referred to as coating material 1, e.g. is positively charged, and a second, as a coating material 2 designated material component is negatively charged.
  • a first material component referred to as coating material 1
  • a second as a coating material 2 designated material component is negatively charged.
  • thermoplastics filled with mica are made from thermoplastics filled with mica.
  • At co-powder coating is e.g. a polymer powder with a tribospray gun applied. The powder particles are charged positively. The mica particles are simultaneously e.g. applied with a corona spray gun. With this type of electrostatic powder application negatively charges the mica particles.
  • the Layer composition i.e. the mica content, is determined by coordinating the Powder mass flows controlled.
  • FIG. 3 shows a third variant of the method, the same as for the second variant of the method two different materials with different electrical charges be applied.
  • the alternating coating with positive and negatively charged particles is repeated until the desired total layer thickness is reached. A greater total layer thickness is also achieved here than through Spraying particles of only a uniform charge would be possible.
  • the third method variant can also be used for coating with a one-component Coating material are used, alternating particles of the same type, but with different charges (not in the drawing shown).

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  • Application Of Or Painting With Fluid Materials (AREA)
  • Paints Or Removers (AREA)

Abstract

The coating involves at least two applicators (1,2), a corona spray gun and a tribo spray gun. One applicator (1) sprays the workpiece with positive charged particles of the covering material and the other applicator sprays it with negative charged particles. The two applicators work at the same time. The application of the particles of different charge at the same time means that the surface charge is less than when there is only one application of particles of one charge so the covering is thicker. Alternatively two applicators spray two different materials each having a different electric charge. The covering is sprayed alternating between the two applicators and thin layers are sprayed.

Description

Die Erfindung bezieht sich auf ein Verfahren zum elektrostatischen Beschichten von Werkstücken mit Pulvermaterialien.The invention relates to a method for the electrostatic coating of Workpieces with powder materials.

Beim elektrostatischen Pulversprühen wird auf die Pulverteilchen eine positive oder negative elektrische Ladung aufgebracht. Die mit einem Beschichtungsvorgang erzielbare Schichtdicke ist im allgemeinen geringer als 500 µm, da die Ladung bereits aufgebrachter Pulverteilchen auf nachfolgende gleichnamig geladene Pulverteilchen abstoßend wirkt. Für viele technische Anwendungen, beispielsweise elektrische oder thermische Isolierschichten, ist die so erreichbare Schichtdicke nicht ausreichend. Es ist dann ein mehrfaches Beschichten mit Schichtsintern notwendig.In electrostatic powder spraying, a positive or negative electrical charge applied. The one that can be achieved with a coating process Layer thickness is generally less than 500 µm because the charge already applied powder particles to subsequent powder particles of the same name repulsive. For many technical applications, for example electrical or thermal insulation layers, the layer thickness that can be achieved in this way is not sufficient. A multiple coating with layer internal is then necessary.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren anzugeben, mit dem in einem Arbeitsgang eine gewünschte größere Schichtdicke erreicht werden kann.The invention has for its object to provide a method with which in a Working step a desired greater layer thickness can be achieved.

Diese Aufgabe wird durch ein Verfahren mit den im Anspruch 1 angegebenen Merkmalen gelöst. Verfahrensvarianten und -ausgestaltungen sind in weiteren Ansprüchen angegeben.This object is achieved by a method with those specified in claim 1 Features resolved. Process variants and configurations are in further claims specified.

Zur Durchführung des Verfahrens geeignete Pulversprüheinrichtungen sind beispielsweise aus der DE 195 42 863 A1 bekannt. Ein gleichzeitiges oder alternierendes Sprühen von positiv geladenem Pulver und negativ geladenem Pulver kann durch Anordnung wenigstens einer Coronaspritzpistole und wenigstens einer Tribospritzpistole erreicht werden.Powder spraying devices suitable for carrying out the method are, for example known from DE 195 42 863 A1. A simultaneous or alternating Spraying of positively charged powder and negatively charged powder can by arranging at least one corona spray gun and at least one tribo spray gun can be achieved.

Die Erfindung wird nachstehend anhand der in Zeichnungsfiguren dargestellten Verfahrensvarianten näher erläutert.The invention is illustrated below with reference to that in the drawing figures Process variants explained in more detail.

Es zeigt:

Fig. 1
einen Beschichtungsvorgang, bei dem ein einkomponentiges Beschichtungsmaterial aufgebracht wird,
Fig. 2
einen Beschichtungsvorgang, bei dem ein zweikomponentiges Beschichtungsmaterial aufgebracht wird, und
Fig. 3
einen Beschichtungsvorgang, bei dem Materialschichten mit unterschiedlicher elektrischer Ladung alternierend aufgesprüht werden.
It shows:
Fig. 1
a coating process in which a one-component coating material is applied,
Fig. 2
a coating process in which a two-component coating material is applied, and
Fig. 3
a coating process in which layers of material with different electrical charges are sprayed alternately.

Zur Durchführung der unterschiedlichen Verfahrensvarianten ist jeweils ein geerdetes Werkstück angeordnet und es sind mindestens zwei Applikatoren 1, 2 vorhanden.To carry out the different process variants, one is earthed Workpiece arranged and there are at least two applicators 1, 2.

Figur 1 zeigt eine erste Verfahrensvariante, bei der ein einkomponentiges Beschichtungsmaterial 1 mittels zweier, als Applikatoren 1, 2 bezeichneter elektrostatischer Auftragsgeräte aufgebracht wird. Der Applikator 1 sprüht positiv geladene Partikel des Beschichtungsmaterials 1 und der Applikator 2 negativ geladene Partikel auf das Werkstück. Die Applikatoren 1, 2 arbeiten gleichzeitig. Anstelle von zwei Applikatoren können auch mehrere Applikatoren zugleich Partikel mit unterschiedlicher Ladung aufbringen. Durch die gleichzeitige Ablagerung von Partikeln unterschiedlicher elektrischer Ladung ist die Oberflächenladung geringer als bei einer Beschichtung mit Partikeln nur einer Ladung. Die erreichbare Pulverschichtdicke ist dadurch höher.Figure 1 shows a first method variant in which a one-component coating material 1 by means of two electrostatic, referred to as applicators 1, 2 Application equipment is applied. The applicator 1 sprays positively charged particles of the coating material 1 and the applicator 2 negatively charged particles the workpiece. The applicators 1, 2 work simultaneously. Instead of two applicators can also use several applicators with different particles Apply cargo. By the simultaneous deposition of particles of different electrical charge, the surface charge is lower than with a coating with particles of only one charge. The achievable powder layer thickness is thereby higher.

Figur 2 zeigt eine zweite Variante, wobei ebenfalls zwei Applikatoren 1, 2 gleichzeitig sprühen, jedoch eine erste, als Beschichtungsmaterial 1 bezeichnete Materialkomponente, z.B. positiv aufgeladen wird, und eine zweite, als Beschichtungsmaterial 2 bezeichnete Materialkomponente negativ aufgeladen wird. FIG. 2 shows a second variant, two applicators 1, 2 likewise being used simultaneously spray, but a first material component, referred to as coating material 1, e.g. is positively charged, and a second, as a coating material 2 designated material component is negatively charged.

Nach einem solchen Verfahren kann beispielsweise eine elektrische Isolation von Kupferleitern durch mit Glimmer gefüllten Thermoplasten hergestellt werden. Bei dem Co-Pulverbeschichten wird z.B. ein Polymerpulver mit einer Tribospritzpistole aufgetragen. Die Pulverpartikel werden hierbei positiv geladen. Die Glimmerpartikel werden gleichzeitig z.B. mit einer Coronaspritzpistole aufgetragen. Bei dieser Art der elektrostatischen Pulverauftragung laden sich die Glimmerteilchen negativ auf. Die Schichtzusammensetzung, also der Glimmeranteil, wird durch eine Abstimmung der Pulvermassenströme kontrolliert.According to such a method, electrical insulation of Copper conductors are made from thermoplastics filled with mica. At co-powder coating is e.g. a polymer powder with a tribospray gun applied. The powder particles are charged positively. The mica particles are simultaneously e.g. applied with a corona spray gun. With this type of electrostatic powder application negatively charges the mica particles. The Layer composition, i.e. the mica content, is determined by coordinating the Powder mass flows controlled.

Figur 3 zeigt eine dritte Verfahrensvariante, wobei wie bei der zweiten Verfahrensvariante zwei verschiedene Materialien mit unterschiedlicher elektrischer Ladung aufgebracht werden. Die Beschichtungsmaterialien 1, 2 werden jedoch alternierend in relativ dünnen Schichten aufgebracht, beginnend z.B. mit einer Beschichtung mit dem Material 1, wie im oberen Teil der Figur 3 dargestellt ist. Anschließend wird eine Schicht des zweiten Materials aufgebracht, das eine andere Ladung hat, wie im unteren Teil der Figur 3 gezeigt. Die abwechselnde Beschichtung mit positiv und negativ geladenen Teilchen wird wiederholt, bis die gewünschte Gesamtschichtdicke erreicht ist. Auch dabei wird eine größere Gesamtschichtdicke erreicht, als durch Aufsprühen von Partikeln nur einer einheitlichen Ladung möglich wäre.FIG. 3 shows a third variant of the method, the same as for the second variant of the method two different materials with different electrical charges be applied. The coating materials 1, 2, however, alternate applied in relatively thin layers, starting e.g. with a coating with the material 1, as shown in the upper part of Figure 3. Then will applied a layer of the second material, which has a different charge, as in shown lower part of Figure 3. The alternating coating with positive and negatively charged particles is repeated until the desired total layer thickness is reached. A greater total layer thickness is also achieved here than through Spraying particles of only a uniform charge would be possible.

Die dritte Verfahrensvariante kann auch zur Beschichtung mit einem einkomponentigen Beschichtungsmaterial genutzt werden, wobei abwechselnd gleichartige Partikel, jedoch mit unterschiedlicher Ladung aufgebracht werden (nicht in der Zeichnung dargestellt).The third method variant can also be used for coating with a one-component Coating material are used, alternating particles of the same type, but with different charges (not in the drawing shown).

Claims (5)

Verfahren zum elektrostatischen Beschichten von Werkstücken mit Pulvermaterialien, wobei mittels mindestens zweier elektrostatischer Auftragsgeräte Pulverpartikel eines ein- oder mehrkomponentigen Beschichtungsmaterials mit unterschiedlicher elektrischer Ladung versehen und auf das Werkstück aufgebracht werden.Process for electrostatically coating workpieces with powder materials, using at least two electrostatic application devices Powder particles of a one- or multi-component coating material with different electrical charge and applied to the workpiece become. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß mittels mindestens zweier Auftragsgeräte, die gleichzeitig arbeiten, Pulverpartikel eines einkomponentigen Beschichtungsmaterials aufgebracht werden, wobei wenigstens eines der Auftragsgeräte Pulverpartikel mit positiver elektrischer Ladung und wenigstens eines der Auftragsgeräte Pulverpartikel mit negativer elektrischer Ladung aufbringt.A method according to claim 1, characterized in that by means of at least two applicators that work at the same time, powder particles of a one-component Coating material are applied, at least one the application devices powder particles with positive electrical charge and at least one of the applicators applies powder particles with negative electrical charge. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß mittels mindestens zweier Auftragsgeräte, die gleichzeitig arbeiten, Pulverpartikel einer ersten Materialkomponente mittels wenigstens einem der Auftragsgeräte mit einer positiven elektrischen Ladung versehen werden und Partikel einer zweiten Materialkomponente mittels wenigstens einem der Auftragsgeräte mit einer negativen elektrischen Ladung versehen werden.A method according to claim 1, characterized in that by means of at least two applicators that work at the same time, powder particles of a first one Material component by means of at least one of the applicators with a positive electrical charge and particles of a second material component by means of at least one of the application devices with a negative electrical charge be provided. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß ein ein- oder mehrkomponentiges Beschichtungsmaterial mit wenigstens zwei Auftragsgeräten auf das Werkstück aufgebracht werden, wobei abwechselnd Schichten von Partikeln mit positiver elektrischer Ladung und solcher mit negativer elektrischer Ladung aufgebracht werden.A method according to claim 1, characterized in that a one or Multi-component coating material with at least two applicators the workpiece are applied, alternating layers of particles with positive electric charge and those with negative electric charge applied become. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß wenigstens eines der Auftragsgeräte eine Coronaspritzpistole und wenigstens eines der Auftragsgeräte eine Tribospritzpistole ist.Method according to one of the preceding claims, characterized in that that at least one of the applicators a corona spray gun and at least one of the application devices is a tribospray gun.
EP98111127A 1997-07-15 1998-06-17 Method for electrostatic coating Withdrawn EP0891817A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19730231 1997-07-15
DE19730231A DE19730231A1 (en) 1997-07-15 1997-07-15 Process for electrostatic coating

Publications (2)

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EP0891817A2 true EP0891817A2 (en) 1999-01-20
EP0891817A3 EP0891817A3 (en) 1999-05-26

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JP (1) JPH1190309A (en)
CA (1) CA2243031A1 (en)
DE (1) DE19730231A1 (en)

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EP0891817A3 (en) 1999-05-26
US6032871A (en) 2000-03-07
CA2243031A1 (en) 1999-01-15
DE19730231A1 (en) 1999-01-21
JPH1190309A (en) 1999-04-06

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