EP3828317B1 - Use of a rack for electrodeposition on plastics - Google Patents

Use of a rack for electrodeposition on plastics Download PDF

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Publication number
EP3828317B1
EP3828317B1 EP20000270.7A EP20000270A EP3828317B1 EP 3828317 B1 EP3828317 B1 EP 3828317B1 EP 20000270 A EP20000270 A EP 20000270A EP 3828317 B1 EP3828317 B1 EP 3828317B1
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European Patent Office
Prior art keywords
protective layer
marker
pvc
frame
layer
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EP20000270.7A
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German (de)
French (fr)
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EP3828317A1 (en
EP3828317C0 (en
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Salvatore Bongiorno
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    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D17/00—Constructional parts, or assemblies thereof, of cells for electrolytic coating
    • C25D17/06—Suspending or supporting devices for articles to be coated
    • 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
    • B05D5/08—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an anti-friction or anti-adhesive surface
    • B05D5/083—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an anti-friction or anti-adhesive surface involving the use of fluoropolymers
    • 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
    • B05D7/52—Two layers
    • B05D7/54—No clear coat specified
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D17/00—Constructional parts, or assemblies thereof, of cells for electrolytic coating
    • C25D17/06—Suspending or supporting devices for articles to be coated
    • C25D17/08—Supporting racks, i.e. not for suspending
    • 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
    • B05D1/18—Processes for applying liquids or other fluent materials performed by dipping
    • B05D1/22—Processes for applying liquids or other fluent materials performed by dipping using fluidised-bed technique
    • B05D1/24—Applying particulate materials
    • 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
    • B05D2451/00—Type of carrier, type of coating (Multilayers)
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
    • B05D3/0254—After-treatment

Definitions

  • the invention relates to the use of a frame according to claim 1.
  • the following invention describes a frame for electroplating with a base body that is surrounded with a PVC layer.
  • Such frames are used for electroplating plastics and metals and they consist of a frame head for hanging the frame made of brass or other materials. Underneath there is a frame made of aluminum, brass, iron or other materials. There are stainless steel contacts on the frame frame for transmitting power to the components for coating.
  • a shielding frame is provided in the edge area to protect the high current density area and in the bottom area there is insulation, which is usually made of PVC in various colors to protect the metal from acid attack during electroplating.
  • the invention is based on the object of imagining the use of such frames.
  • the protective layer prevents metallization of the frame and thus promotes galvanization of the treated products.
  • the protective layer closes micro-cracks and pores on the PVC-coated frames that can arise during the manufacture of the frames.
  • alternative oxidizing agents such as. B. manganese compounds and strong acids.
  • the aggressive pickling processes prevent palladium and other metals such as iridium from the platinum group, which have a catalytic character, from diffusing from the pretreatment into a still cracked and porous PVC frame insulation and in the PVC insulation is absorbed.
  • the base body is essentially made of metal. This is primarily about the frame, which can be made from aluminum, brass, iron or other metals.
  • the protective layer has a fluorocarbon.
  • the fluorine atoms Since in fluoropolymers the fluorine atoms, with their larger volume, are significantly larger than the hydrogen atoms, they form a dense and protective shell around the carbon chain and thereby provide highly effective protection against chemical attacks.
  • the very stable bond between the carbon atoms and the fluorine atoms also results in high thermal and chemical strength at both particularly high and particularly low temperatures.
  • the protective layer comprises polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE) or a modified PTFE (TFM) from Dyneon.
  • PVDF polyvinylidene fluoride
  • PTFE polytetrafluoroethylene
  • TFM modified PTFE
  • PFA perfluoroalkoxy
  • PCTFE Polytrifluoroethylene
  • PVDF polyvinylidene fluoride
  • ECTFE Ethylene-chlorotrifluoroethylene copolymer
  • a copolymer of ethylene and tetrafluoroethylene (ETFE) enables the production of molded parts using injection molding.
  • the materials described can be used alternatively or cumulatively depending on the coating technology.
  • the protective layer is usually transparent. This results in the frame having the color of the PVC layer. However, the protective layer can also be opaque.
  • a marker be applied to the PVC layer under the protective layer, which should function as an early warning system. As long as this marker is visible, it is protected by the protective layer. However, if the protective layer is removed, then the marker in between is attacked during staining and then the PVC layer underneath. The material of the marker is chosen so that the marker is attacked by the stain used before the PVC layer is attacked. If the marker is no longer visible, then the expert knows that the PVC layer is already being attacked or at least is no longer adequately protected by the protective layer, which in turn promotes cracks and porosity in the PVC, which the frame is used as insulation is coated. It is then time to replace or recoat the frame.
  • the marker is not always visible. Therefore, it is suggested that the marker is invisible to light in the range between 750 nm and 400 nm. This means you cannot see the marker in natural light.
  • the frame is illuminated with a special light source, such as UV light or IR light with a specific wavelength range, then the expert can tell whether the marker is still visible, has already been removed from the stain or is just attacked. From this, the expert can determine whether the PVC layer has already been attacked or the protective layer is still completely intact.
  • the protective layer is applied to the still soft PVC layer. This creates a particularly intimate connection between the PVC layer and the protective layer.
  • the protective layer can be applied as a powder.
  • a powder swirling process is particularly suitable here.
  • the protective layer can also be applied in liquid form.
  • the protective layer is baked.
  • a baking process at temperatures of, for example, 100 °C to 300 °C or, for PVDF, around 200 °C is suitable.
  • a marker can be applied between the PVC layer and the protective layer, which is only visible with light in a certain defined wavelength range outside of visible light. This means that the specialist can use a lamp with a special light that is tailored to the marker to make the marker visible, provided it has not yet been washed away by the stain because the protective layer no longer fulfills its function.
  • Such frames are particularly suitable for the electroplating of plastics.
  • Frame 1 shown has a base body 2, which is also referred to as a frame frame and is made of aluminum, brass, iron or other materials. Above this is the frame head 3 and contacts 4 made of stainless steel are provided on the frame frame for the power transmission of the components for coating.
  • a shielding frame 5 serves to protect the area with a high current density and the insulation 6 is usually made of PVC in various colors to protect the metal from acid attack during electroplating.
  • the Figure 1 shows a cross section through the base body 2, which is surrounded by a PVC layer 7.
  • a protective layer 8 made of PVDF is applied around the PVC layer 7.
  • a marker 9 is applied to the PVC layer 7 at least in some places or at a specific point. This marker 9 is only visible in the exemplary embodiment when a UV light 10 from a UV lamp 11 reaches the marker 9 through the protective layer 8.
  • the protective layer 8 can be removed by the chemical agents of the stain. Then the PVC layer 7 is vulnerable. In this case, however, the marker 9 applied to the PVC layer 7 is also vulnerable. In practice, the marker is attacked first when the protective layer 8 no longer fulfills its protective function. This means that a missing marker or a damaged marker indicates that the PVC layer 7 is at least in danger of being attacked and roughened by the pickling process.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Laminated Bodies (AREA)

Description

Die Erfindung betrifft die Verwendung eines Gestells laut Anspruch 1.The invention relates to the use of a frame according to claim 1.

Es wird nachfolgend Erfindung ein Gestell für die Galvanisierung mit einem Grundkörper, der mit einer PVC-Schicht umgeben ist, beschrieben. Derartige Gestelle werden für die Galvanisierung von Kunststoffen und Metallen verwendet und sie bestehen aus einem Gestellkopf zum Anhängen des Gestells aus Messing oder anderen Materialien. Darunter befindet sich ein Gestellrahmen aus Aluminium, Messing, Eisen oder anderen Materialien. Am Gestellrahmen befinden sich Kontakte aus Edelstahl für die Stromübertragung der Bauteile zur Beschichtung. Im Randbereich ist ein Abblendrahmen zum Schutz des hohen Stromdichtebereichs vorgesehen und im Bodenbereich befindet sich eine Isolierung, die meist aus PVC in diversen Farben zum Schutz des Metalls vor Säureangriff beim Galvanisieren hergestellt ist.The following invention describes a frame for electroplating with a base body that is surrounded with a PVC layer. Such frames are used for electroplating plastics and metals and they consist of a frame head for hanging the frame made of brass or other materials. Underneath there is a frame made of aluminum, brass, iron or other materials. There are stainless steel contacts on the frame frame for transmitting power to the components for coating. A shielding frame is provided in the edge area to protect the high current density area and in the bottom area there is insulation, which is usually made of PVC in various colors to protect the metal from acid attack during electroplating.

Je nach Verwendung unterschiedlicher Beizen oder unterschiedlicher Vorbehandlungsprozesse besteht die Gefahr, dass die Beizen oder katalytisch wirkenden Substanzen in die PVC-Gestellisolierung eindringen. Eine Absorption von Stoffen aus dem Vorbehandlungsprozess im PVC-Überzug des Gestells bindet einerseits notwendige Bestandteile der Beizen am Gestell und kann andererseits die Schutzfunktion des PVC-Überzugs beeinträchtigen.Depending on the use of different stains or different pre-treatment processes, there is a risk that the stains or catalytically active substances will penetrate the PVC frame insulation. Absorption of substances from the pretreatment process in the PVC coating of the frame, on the one hand, binds necessary components of the stain to the frame and, on the other hand, can impair the protective function of the PVC coating.

Die US 3 592 744 A hat bereits im Jahre 1971 ein derartiges Gestell mit einem PVC-Überzug beschrieben. Parallel dazu gab es im Jahre 1971 den Vorschlag, fluorhaltige thermoplastische Polyolefine als Isolierung zu verwenden. Dies wurde in der DE 19 45 699 A beschrieben.The US 3,592,744 A already described such a frame with a PVC cover in 1971. At the same time, in 1971 there was a proposal to use fluorine-containing thermoplastic polyolefins as insulation. This was done in the DE 19 45 699 A described.

Zur Galvanisierung von Metallen wurden in der JP H06 010197 A im Jahre 1992 verschiedene Schichten mit unterschiedlichen Materialien und insbesondere mit Kohlenstoff vorgestellt, um die Funktionen Isolation und Härte durch unterschiedliche Materialien zu erzielen, die in unterschiedlicher Reihenfolge auf einen Metalldraht aufgebracht wurden. Derartige Gestelle wurden jedoch aus unterschiedlichen Gründen nicht für die Galvanisierung von Kunststoffen eingesetzt.For the galvanization of metals, JP H06 010197 A in 1992 Different layers with different materials and in particular with carbon were presented to achieve the functions of insulation and hardness through different materials applied to a metal wire in different orders. However, such racks were not used for electroplating plastics for various reasons.

Der Erfindung liegt die Aufgabe zu Grunde, eine Verwendung derartiger Gestelle vorzustellen.The invention is based on the object of imagining the use of such frames.

Die Erfindung wird mit einer Verwendung nach Patentanspruch 1 gelöst.The invention is achieved with a use according to claim 1.

Dadurch entsteht eine Multilayerisolierung mit einem besonders hydrophoben Charakter. Durch das Verschließen von Mikro- und Makrorissen in der PVC-Schicht wird eine Absorptionssperre für katalytisch wirkende Medien erreicht. Eine Inhibition dient der Vermeidung des Angriffs auf die PVC-Schicht. Dadurch wird vor allem die Beeinträchtigung des Gestells durch neuartige chromfreie Beizen reduziert und eine Metallisierung dieses Gestelles verhindert.This creates a multilayer insulation with a particularly hydrophobic character. By closing micro and macro cracks in the PVC layer, an absorption barrier for catalytically acting media is achieved. Inhibition serves to avoid attack on the PVC layer. This primarily reduces the impact on the frame caused by new chrome-free stains and prevents this frame from being metallized.

Die Schutzschicht verhindert eine Metallisierung des Gestells und begünstigt somit die Galvanisierung der behandelten Produkte.The protective layer prevents metallization of the frame and thus promotes galvanization of the treated products.

Die Schutzschicht verschließt Mikrorisse und Poren an den PVC-ummantelten Gestellen, die bei der Fertigung der Gestelle entstehen können. Dadurch eignen sich die erfindungsgemäßen Gestelle vor allem für eine chromfreie Vorbehandlung unter Verwendung von alternativen Oxidationsmitteln wie z. B. Manganverbindungen und starken Säuren. Insbesondere wird verhindert, dass bei der Galvanisierung von Kunststoffen durch die aggressiven Beizprozesse begünstigt Palladium und andere Metalle wie beispielsweise Iridium aus der Platingruppe, die einen katalytischen Charakter aufweisen, von der Vorbehandlung in eine noch rissige und porige Gestellisolierung aus PVC diffundiert und in der PVC-Isolierung absorbiert wird.The protective layer closes micro-cracks and pores on the PVC-coated frames that can arise during the manufacture of the frames. This makes the frames according to the invention particularly suitable for a chromium-free pretreatment using alternative oxidizing agents such as. B. manganese compounds and strong acids. In particular, when electroplating plastics, the aggressive pickling processes prevent palladium and other metals such as iridium from the platinum group, which have a catalytic character, from diffusing from the pretreatment into a still cracked and porous PVC frame insulation and in the PVC insulation is absorbed.

Vorteilhaft ist es, wenn der Grundkörper im Wesentlichen aus Metall hergestellt ist. Hierbei geht es vor allem um den Gestellrahmen, der aus Aluminium, Messing, Eisen oder anderen Metallen hergestellt werden kann.It is advantageous if the base body is essentially made of metal. This is primarily about the frame, which can be made from aluminum, brass, iron or other metals.

Die Schutzschicht weist einen Fluorkohlenstoff auf.The protective layer has a fluorocarbon.

Da bei Fluorpolymeren die Fluoratome mit ihrem größeren Volumen gegenüber den Wasserstoffatomen wesentlich größer sind, bilden diese um die Kohlenstoffkette eine dichte und schützende Hülle und bewirken dadurch einen höchst wirksamen Schutz gegen chemische Angriffe. Die sehr stabile Bindung der Kohlenstoffatome mit den Fluoratomen bewirkt zudem eine hohe thermische und chemische Festigkeit sowohl bei besonders hohen als auch bei besonders tiefen Temperaturen.Since in fluoropolymers the fluorine atoms, with their larger volume, are significantly larger than the hydrogen atoms, they form a dense and protective shell around the carbon chain and thereby provide highly effective protection against chemical attacks. The very stable bond between the carbon atoms and the fluorine atoms also results in high thermal and chemical strength at both particularly high and particularly low temperatures.

Daher wird vorgeschlagen, dass die Schutzschicht Polyvinylidenfluorid (PVDF), Polytetrafluorethylen (PTFE) oder ein modifiziertes PTFE (TFM) von Dyneon aufweist. Bei modifiziertem PTFE wird durch eine geringfügige Zuführung von Sauerstoff die Kettenlänge von PTFE verkürzt und auch eine Quervernetzung der Molekülketten vermehrt. Dadurch erhöht sich die Belastbarkeit auf Druck- und Zugbeanspruchungen. Die Schutzschicht kann jedoch auch Perfluor-Alkoxy (PFA) aufweisen, das annähernd die gleichen Eigenschaften wie PTFE aufweist. Durch die kürzere Kettenlänge, die durch das eingelagerte Sauerstoffatom bedingt ist, wird eine niedrigere Schmelzviskosität erzielt. Perfluor-Alkoxy ist daher spritzfähig.Therefore, it is suggested that the protective layer comprises polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE) or a modified PTFE (TFM) from Dyneon. With modified PTFE, a slight addition of oxygen shortens the chain length of PTFE and also increases cross-linking of the molecular chains. This increases the resilience to compressive and tensile stresses. However, the protective layer can also contain perfluoroalkoxy (PFA), which has approximately the same properties as PTFE. The shorter chain length, which is caused by the embedded oxygen atom, results in a lower melt viscosity. Perfluoroalkoxy is therefore sprayable.

Weiterhin wird Polytrifluoretylen (PCTFE) vorgeschlagen, das ebenfalls spritzfähig ist und eine größere Härte als PTFE und PFA aufweist. Gute Ergebnisse wurden auch mit Polyvinylidenfluorid (PVDF) erzielt. Dieser Teilfluorierter Kohlenstoff besitzt eine sehr gute chemische Beständigkeit. Ethylen-Chlortrifluoretylen-Copolymer (ECTFE) sorgt für eine besonders porendichte und korrosionsbeständige Pulverbeschichtung. Ein Copolymerisat aus Ethylen und Tetrafluoräthylen (ETFE) ermöglicht die Herstellung von Formteilen im Spritzgussverfahren.Polytrifluoroethylene (PCTFE) is also proposed, which is also sprayable and has a greater hardness than PTFE and PFA. Good results were also achieved with polyvinylidene fluoride (PVDF). This partially fluorinated carbon has very good chemical resistance. Ethylene-chlorotrifluoroethylene copolymer (ECTFE) ensures a particularly pore-tight and corrosion-resistant powder coating. A copolymer of ethylene and tetrafluoroethylene (ETFE) enables the production of molded parts using injection molding.

Die beschriebenen Materialien können je nach Beschichtungstechnik alternativ oder kumulativ eingesetzt werden.The materials described can be used alternatively or cumulatively depending on the coating technology.

Dabei ist die Schutzschicht in der Regel durchsichtig. Dies führt dazu, dass das Gestell die Farbe der PVC-Schicht hat. Die Schutzschicht kann aber auch undurchsichtig sein.The protective layer is usually transparent. This results in the frame having the color of the PVC layer. However, the protective layer can also be opaque.

Um zu erkennen, ob die Schutzschicht noch dick genug ist oder bereits verbraucht ist, wird vorgeschlagen, dass auf die PVC-Schicht unter der Schutzschicht ein Marker aufgebracht ist, welcher als Frühwarnsystem funktionieren soll. Solange dieser Marker zu sehen ist, wird er von der Schutzschicht geschützt. Wenn die Schutzschicht aber abgetragen ist, dann wird beim Beizen zunächst der dazwischenliegende Marker und danach die darunter liegende PVC-Schicht angegriffen. Das Material des Markers ist so gewählt, dass der Marker durch die verwendete Beize angegriffen wird, bevor die PVC-Schicht angegriffen wird. Wenn nun der Marker nicht mehr zu sehen ist, dann weiß der Fachmann, dass auch bereits die PVC-Schicht angegriffen wird oder zumindest durch die Schutzschicht nicht mehr ausreichend geschützt ist, was wiederum Rissigkeiten und Porosität vom PVC begünstigt, mit dem das Gestell als Isolierung beschichtet ist. Es ist dann an der Zeit, das Gestell auszutauschen oder neu zu beschichten.In order to recognize whether the protective layer is still thick enough or has already been used up, it is suggested that a marker be applied to the PVC layer under the protective layer, which should function as an early warning system. As long as this marker is visible, it is protected by the protective layer. However, if the protective layer is removed, then the marker in between is attacked during staining and then the PVC layer underneath. The material of the marker is chosen so that the marker is attacked by the stain used before the PVC layer is attacked. If the marker is no longer visible, then the expert knows that the PVC layer is already being attacked or at least is no longer adequately protected by the protective layer, which in turn promotes cracks and porosity in the PVC, which the frame is used as insulation is coated. It is then time to replace or recoat the frame.

Vorteilhaft ist es, wenn der Marker nicht immer sichtbar ist. Daher wird vorgeschlagen, dass der Marker bei Licht im Bereich zwischen 750 nm und 400 nm unsichtbar ist. Somit sieht man den Marker bei natürlichem Licht nicht. Wenn das Gestell aber mit einer speziellen Lichtquelle, wie beispielsweise UV-Licht oder IR-Licht mit einem bestimmten Wellenlängenbereich, angestrahlt wird, dann erkennt der Fachmann, ob der Marker noch sichtbar ist, bereits von der Beize entfernt wurde oder nur angegriffen ist. Daraus kann der Fachmann ermitteln, ob die PVC-Schicht bereits angegriffen ist oder die Schutzschicht noch vollständig intakt ist.It is advantageous if the marker is not always visible. Therefore, it is suggested that the marker is invisible to light in the range between 750 nm and 400 nm. This means you cannot see the marker in natural light. However, if the frame is illuminated with a special light source, such as UV light or IR light with a specific wavelength range, then the expert can tell whether the marker is still visible, has already been removed from the stain or is just attacked. From this, the expert can determine whether the PVC layer has already been attacked or the protective layer is still completely intact.

Besonders vorteilhaft ist es, wenn die Schutzschicht auf die noch weiche PVC-Schicht aufgebracht wird. Dadurch wird eine besonders innige Verbindung zwischen PVC-Schicht und Schutzschicht erreicht.It is particularly advantageous if the protective layer is applied to the still soft PVC layer. This creates a particularly intimate connection between the PVC layer and the protective layer.

Die Schutzschicht kann als Pulver aufgebracht werden. Hierbei eignet sich besonders ein Pulververwirbelungsverfahren. Die Schutzschicht kann jedoch auch flüssig aufgebracht werden.The protective layer can be applied as a powder. A powder swirling process is particularly suitable here. However, the protective layer can also be applied in liquid form.

Besonders vorteilhaft ist es, wenn die Schutzschicht eingebrannt wird. Je nach verwendetem Material eignet sich ein Einbrennvorgang bei Temperaturen von beispielsweise 100 °C bis 300 °C oder bei PVDF von etwa 200 °C.It is particularly advantageous if the protective layer is baked. Depending on the material used, a baking process at temperatures of, for example, 100 °C to 300 °C or, for PVDF, around 200 °C is suitable.

Zur Bestimmung der Qualität der Schutzschicht kann zwischen die PVC-Schicht und die Schutzschicht ein Marker aufgebracht werden, der nur bei einem Licht in einem bestimmten definierten Wellenlängenbereich außerhalb des sichtbaren Lichts sichtbar ist. Dies führt dazu, dass der Fachmann mit einer Lampe mit einer speziellen Leuchte, die auf den Marker abgestimmt ist, den Marker sichtbar machen kann, sofern er noch nicht durch die Beize abgewaschen wurde, weil die Schutzschicht ihre Funktion nicht mehr erfüllt.To determine the quality of the protective layer, a marker can be applied between the PVC layer and the protective layer, which is only visible with light in a certain defined wavelength range outside of visible light. This means that the specialist can use a lamp with a special light that is tailored to the marker to make the marker visible, provided it has not yet been washed away by the stain because the protective layer no longer fulfills its function.

Derartige Gestelle eignen sich vor allem für die Galvanisierung von Kunststoffen.Such frames are particularly suitable for the electroplating of plastics.

Ein vorteilhaftes Ausführungsbeispiel ist in der Zeichnung dargestellt und wird im Folgenden näher beschrieben.An advantageous exemplary embodiment is shown in the drawing and is described in more detail below.

Es zeigt

  • Figur 1 einen Querschnitt durch einen Teil eines Gestells und
  • Figur 2 ein Gestell für die Galvanisierung.
It shows
  • Figure 1 a cross section through part of a frame and
  • Figure 2 a rack for galvanizing.

Das in Figur 2 gezeigte Gestell 1 hat einen Grundkörper 2, der auch als Gestellrahmen bezeichnet wird und aus Aluminium, Messing, Eisen oder anderen Materialien hergestellt ist. Darüber befindet sich der Gestellkopf 3 und am Gestellrahmen sind Kontakte 4 aus Edelstahl für die Stromübertragung der Bauteile zur Beschichtung vorgesehen. Ein Abblendrahmen 5 dient dem Schutz des Bereichs mit einer hohen Stromdichte und die Isolierung 6 wird meist in diversen Farben aus PVC zum Schutz des Metalls vor Säureangriff beim Galvanisieren hergestellt.This in Figure 2 Frame 1 shown has a base body 2, which is also referred to as a frame frame and is made of aluminum, brass, iron or other materials. Above this is the frame head 3 and contacts 4 made of stainless steel are provided on the frame frame for the power transmission of the components for coating. A shielding frame 5 serves to protect the area with a high current density and the insulation 6 is usually made of PVC in various colors to protect the metal from acid attack during electroplating.

Die Figur 1 zeigt einen Querschnitt durch den Grundkörper 2, der mit einer PVC-Schicht 7 umgeben ist. Um die PVC-Schicht 7 ist eine Schutzschicht 8 aus PVDF aufgebracht. Bevor die Schutzschicht 8 auf die PVC-Schicht 7 aufgebracht wird, wird zumindest an einigen Stellen oder an einer bestimmten Stelle auf die PVC-Schicht 7 ein Marker 9 aufgebracht. Dieser Marker 9 ist im Ausführungsbeispiel nur dann sichtbar, wenn durch die Schutzschicht 8 ein UV-Licht 10 einer UV-Lampe 11 auf den Marker 9 gelangt.The Figure 1 shows a cross section through the base body 2, which is surrounded by a PVC layer 7. A protective layer 8 made of PVDF is applied around the PVC layer 7. Before the protective layer 8 is applied to the PVC layer 7, a marker 9 is applied to the PVC layer 7 at least in some places or at a specific point. This marker 9 is only visible in the exemplary embodiment when a UV light 10 from a UV lamp 11 reaches the marker 9 through the protective layer 8.

Bei einem längeren Einsatz des Gestells 1 kann durch die chemischen Mittel der Beize die Schutzschicht 8 abgetragen werden. Dann ist die PVC-Schicht 7 angreifbar. In diesem Fall ist aber auch der auf der PVC-Schicht 7 aufgebrachte Marker 9 angreifbar. In der Praxis wird zuerst der Marker angegriffen, wenn die Schutzschicht 8 ihre Schutzfunktion nicht mehr erfüllt. Dadurch verweist ein Fehlen des Markers oder ein angegriffener Marker darauf, dass die PVC-Schicht 7 zumindest in Gefahr ist angegriffen und durch den Beizprozess aufgeraut zu werden.If the frame 1 is used for a longer period of time, the protective layer 8 can be removed by the chemical agents of the stain. Then the PVC layer 7 is vulnerable. In this case, however, the marker 9 applied to the PVC layer 7 is also vulnerable. In practice, the marker is attacked first when the protective layer 8 no longer fulfills its protective function. This means that a missing marker or a damaged marker indicates that the PVC layer 7 is at least in danger of being attacked and roughened by the pickling process.

Claims (6)

  1. Use of a rack (1), which has a base body (2), which is surrounded by a PVC layer (7), wherein a protective layer (8) having a fluoroplastic is applied to the PVC layer (7), for the electrodeposition of plastics.
  2. Use according to Claim 1, wherein the base body (2) is substantially made of metal.
  3. Use according to one of the preceding claims, wherein the protective layer (8) has polytetrafluoroethylene (PTFE), modified PTFE (TFM), perfluoroalkoxy (PFA), polychlorotrifluoroethylene (PCTFE), polyvinylidene fluoride (PVDF), ethylenechlorotrifluoroethylene copolymer (ECTFE) and/or a copolymer of ethylene and tetrafluoroethylene (ETFE).
  4. Use according to one of the preceding claims, wherein the protective layer (8) is transparent.
  5. Use according to one of the preceding claims, wherein a marker (9) is applied to the PVC layer (7) below the protective layer (8), wherein the material of the marker is selected such that the marker is attacked by the stain used before the PVC layer is attacked.
  6. Use according to Claim 5, wherein the marker (9) is invisible in light in the range between 750 nm and 400 nm.
EP20000270.7A 2019-11-26 2020-07-31 Use of a rack for electrodeposition on plastics Active EP3828317B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102019008181.1A DE102019008181A1 (en) 2019-11-26 2019-11-26 Rack for electroplating and method for protecting racks for electroplating and use of such a rack

Publications (3)

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EP3828317A1 EP3828317A1 (en) 2021-06-02
EP3828317B1 true EP3828317B1 (en) 2023-12-06
EP3828317C0 EP3828317C0 (en) 2023-12-06

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EP20000270.7A Active EP3828317B1 (en) 2019-11-26 2020-07-31 Use of a rack for electrodeposition on plastics

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EP (1) EP3828317B1 (en)
DE (1) DE102019008181A1 (en)
ES (1) ES2973485T3 (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6187899A (en) * 1984-10-05 1986-05-06 Daikin Ind Ltd Plating jig

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3592744A (en) * 1968-12-02 1971-07-13 Macdermid Inc Method of preventing rack plating in continuous plating cycle for nonconductive articles
DE1945699B2 (en) * 1969-09-10 1971-10-28 Farbenfabriken Bayer Ag, 5090 Leverkusen USE OF FLUORINE THERMOPLASTIC POLYOLEFINS AS INSULATION IN CHEMICAL METAL DEPOSITION
JP3246957B2 (en) * 1992-04-30 2002-01-15 ローム株式会社 Plating jig
US9506150B2 (en) * 2014-10-13 2016-11-29 Rohm And Haas Electronic Materials Llc Metallization inhibitors for plastisol coated plating tools

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6187899A (en) * 1984-10-05 1986-05-06 Daikin Ind Ltd Plating jig

Also Published As

Publication number Publication date
DE102019008181A1 (en) 2021-05-27
EP3828317A1 (en) 2021-06-02
ES2973485T3 (en) 2024-06-20
EP3828317C0 (en) 2023-12-06

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