EP0514796A1 - Procédé pour la peinture par électrophorèse cathodique ou anodique de matériaux profilés ou de matériaux en bande - Google Patents

Procédé pour la peinture par électrophorèse cathodique ou anodique de matériaux profilés ou de matériaux en bande Download PDF

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Publication number
EP0514796A1
EP0514796A1 EP92108299A EP92108299A EP0514796A1 EP 0514796 A1 EP0514796 A1 EP 0514796A1 EP 92108299 A EP92108299 A EP 92108299A EP 92108299 A EP92108299 A EP 92108299A EP 0514796 A1 EP0514796 A1 EP 0514796A1
Authority
EP
European Patent Office
Prior art keywords
strip
profile material
electrolyte
anode
cathode
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.)
Ceased
Application number
EP92108299A
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German (de)
English (en)
Inventor
Klaus Jörgens
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0514796A1 publication Critical patent/EP0514796A1/fr
Ceased legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D13/00—Electrophoretic coating characterised by the process
    • C25D13/12—Electrophoretic coating characterised by the process characterised by the article coated
    • C25D13/16—Wires; Strips; Foils

Definitions

  • the invention relates to a method for the anodic or cathodic electro-coating of strip or profile material.
  • the strip material is unwound from a roll, runs over deflecting rollers through successive cleaning and rinsing tanks and is then passed over further deflecting rollers into a tank, where the electro-coating takes place.
  • Electro-coating using a water-soluble lacquer as an electrolyte liquid is based on the physical principle of electrophoresis.
  • the electrically conductive tape material e.g. B. aluminum or steel strip is passed through the electrocoating bath, the paint being deposited on the metallic substrate in the immersion process by electrochemical and chemical reactions.
  • the water-soluble lacquer as an electrolyte liquid contains ionizable, salt-forming groups as binders, although in this form are water-insoluble, but in a neutralization reaction with basic media, e.g. B. amines can be made water-soluble with salt formation if these binders contain groups with an acidic character (carboxyl groups).
  • the baths In order to avoid sedimentation of the solid particles, the baths have to be constantly circulated, and in this way the separable particles are transported.
  • the phenomenon of electrophoresis i.e. H. the migration of the charged particles to the anode or to the cathode takes place.
  • the paint particles carry a positive charge in the aqueous system, i. H.
  • the binders contain basic groups and have been neutralized with acids, they coagulate in the basic environment with film formation on the cathode.
  • the strip material to be painted represents the cathode and one speaks of cathodic electrocoating.
  • the paint particles coagulate with film formation on the anode if they have been neutralized with amines and have a negative charge in the aqueous system.
  • the workpiece is the anode and one speaks of anodic electrocoating.
  • strip material can be coated at high speed and very evenly. After leaving the electrolyte bath, unnecessary, not coagulated electrolyte is rinsed off in a further bath, after which the coating is dried in a drying device.
  • both surfaces of the material can only be coated simultaneously and with the same layer thickness. Furthermore, only strip material, but not profiled bars, can be coated with this method.
  • the invention has for its object to provide a method for anodic or cathodic electro-painting, with which strip or profile material can be coated on one side or on both sides with the same or different coatings evenly with the same or different thickness.
  • an electrically conductive connection of at least one surface of the strip or profile material to a cathode or anode is produced by means of an uninterrupted jet or liquid curtain emanating from the cathode or anode from a water-soluble lacquer as an electrolyte liquid.
  • the strip or profile material is moved to continuously apply the electrolyte liquid to at least one surface, and the coating particles coagulate with film formation on at least one surface of the strip or profile material by applying a DC voltage between the cathode and the anode.
  • the strip or profile material As anode or cathode and an anode or cathode in connection with the electrolyte fluid is achieved via the continuous jet or the liquid curtain, the strip or profile material needs for wetting with the electrolyte fluid are not diverted and immersed in a bath, but can be guided horizontally or vertically without deflection. Since no deflection is required, profile material that is inherently rigid can be electrolacquered in a continuous process, which was previously only possible by immersing it in pieces in an electrolyte bath.
  • the jet or liquid curtain can form an uninterrupted layer which extends over the entire width of the strip or profile material.
  • An uninterrupted jet or liquid curtain can be directed onto both surfaces of the strip or profile material at the same time, so that both surfaces are coated at the same time.
  • the beam cross sections By adjusting the beam cross sections, the beam speeds, the throughput speed of the strip or profile material, the level of the applied DC voltage and / or the electrolyte composition, it can be achieved that a predefinable, possibly different layer thickness of the coagulated film is produced on the two surfaces.
  • the tape or profile material can be moved horizontally and electrolytic liquid can be applied from below and / or above.
  • the strip can be turned through 180 ° after the first coating in order to carry out the second coating in the same direction.
  • the tape or profile material can be coated standing vertically simultaneously or successively from both sides. The strip or profile material can be moved horizontally or vertically.
  • the example shown relates to the coating of strip material 5, but can be used in an analogous manner for profile material.
  • strip material 5 is unwound from a roll on a decoiler 1 and passed through the system until it is rolled up again on a decoiler 21
  • profile material can be passed straight through the system, this profile material being introduced into and removed from the system as rod material can or can be unwound as a strip material from a roll arranged on a decoiler 1, passed through a profiling system, not shown, and can be passed through the system as a profile.
  • the rewinder 21 is omitted at the end of the system and is replaced by a cutting device, not shown, so that profile material cut to length is obtained.
  • the system is as follows: The strip material 5 unwound from the uncoiler 1 is passed through a first pair of conveying rollers 2, a cleaning device 3, a further pair of conveying rollers 2, a flushing device 4 until the flat strip material 5 comes to another pair of rollers 6, the immediately before a coating device is arranged.
  • This pair of rollers 6 is connected via a line 14 to the positive pole of a direct current source 13 and in this way acts on the strip material 5 with the positive pole of the direct current source 3, so that the strip material 5 becomes the anode.
  • the positive pole of the DC power source 13 is grounded so that it is not necessary to isolate the entire system.
  • the coating system consists of a collecting trough 7 for electrolyte liquid 8 arranged below the band material 5 and a cover 7a arranged above the band material 5.
  • a pump draws electrolyte liquid from the collecting trough 7 and feeds it via a line 10 to a nozzle 11 arranged above the strip material 5 and / or to a nozzle 12 arranged below the strip material.
  • the nozzles 11, 12 extend over the entire width of the strip material 5 and act on the surfaces of the strip material 5 in a uniform, uninterrupted jet or liquid curtain, through which an electrical connection between the nozzles 11, 12 and thus via a conductor 15 to the negative pole the DC power source 13 is maintained.
  • the nozzles 11, 12 are arranged in an electrically insulated manner from the collecting trough 7 and the covering hood 7a and the pump 9. During the passage of the strip material 5 between the nozzles 11, 12, the charge equalization takes place between the strip material 5 acting as an anode and the nozzles 11, 12 acting as cathode via the electrolyte liquid jet.
  • the paint particles thus coagulate on the strip material as an anode with film formation, the layer thickness being determined by the Throughput speed of the strip material, the beam cross section, the beam speed, the direct voltage generated by the direct current source 13 and / or the electrolyte composition can be adjusted so that a predeterminable, possibly different layer thickness can be achieved on the two surfaces.
  • a pair of squeeze rollers 16 Arranged within the space formed by the collecting trough 7 and the covering hood 7a is a pair of squeeze rollers 16 which squeeze out the non-coagulated electrolyte liquid that is carried along.
  • the strip material 5 is then fed by means of transport rollers 17 to a rinsing device 18 and a drying device 19, from where the strip material 5 is drawn off by means of a further pair of transport rollers 20 and is rewound into a roll in a reel 21.
  • two collecting troughs 7 with a covering hood 7a, nozzles 11, 12 arranged therein, squeeze rollers 16 and a pump 9 can be arranged one behind the other in a manner not shown, so that in the first coating step z.
  • the top of the strip material 5 with an electrolyte liquid, for. B. a certain color or a certain composition is coated with a predetermined layer thickness and then coated in the following coating unit, the other side of the strip material 5 in the desired manner. This allows the top and bottom Bottom of the strip material 5 to be executed in different colors and / or to set different layer thicknesses.
  • the strip material 5 can, as shown, be passed horizontally through the coating system. It is also possible to transport the strip material 5 standing vertically in a horizontal direction, which may reduce the width of the system. Furthermore, it is possible to turn the strip material 5 by 180 ° after coating one side and then to coat the other side, if the position of the nozzles 11, 12 is basically to be such that the jet is from top to bottom or from below is directed upwards against the strip material 9.
  • the jet or liquid curtain emerging from the nozzles 11, 12 forms an uninterrupted layer on at least one surface of the strip or profile material, covering the entire width of the strip or profile material To coat electrolytic liquid wetted surface of the strip or profile material by film formation.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Electroplating Methods And Accessories (AREA)
EP92108299A 1991-05-22 1992-05-16 Procédé pour la peinture par électrophorèse cathodique ou anodique de matériaux profilés ou de matériaux en bande Ceased EP0514796A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4116643 1991-05-22
DE4116643A DE4116643C2 (de) 1991-05-22 1991-05-22 Verfahren zum anodischen oder kathodischen Elektrolackieren von Band- oder Profilmaterial

Publications (1)

Publication Number Publication Date
EP0514796A1 true EP0514796A1 (fr) 1992-11-25

Family

ID=6432142

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92108299A Ceased EP0514796A1 (fr) 1991-05-22 1992-05-16 Procédé pour la peinture par électrophorèse cathodique ou anodique de matériaux profilés ou de matériaux en bande

Country Status (3)

Country Link
US (1) US5264096A (fr)
EP (1) EP0514796A1 (fr)
DE (1) DE4116643C2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011156341A1 (fr) * 2010-06-11 2011-12-15 Ppg Industries Ohio, Inc. Procédé de dépôt d'une composition de revêtement électrodéposable sur un substrat à l'aide d'une pluralité de flux liquides

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5366687A (en) * 1991-01-07 1994-11-22 United Technologies Corporation Electrophoresis process for preparation of ceramic fibers
DE4127740A1 (de) * 1991-08-22 1993-03-04 Klaus Joergens Verfahren und vorrichtung zum pruefen der porositaet von beschichteten gegenstaenden
JP3299451B2 (ja) * 1996-09-30 2002-07-08 新日本製鐵株式会社 竪型電解装置
JP3340352B2 (ja) * 1997-05-22 2002-11-05 富士通株式会社 配線パターンを有する磁気ヘッド用サスペンション素子の製造方法
US20020162749A1 (en) * 2001-03-02 2002-11-07 Emmonds Donald D. Apparatus and methods for continuously electrocoating metal blanks and/or coiled metal substrates
US6676820B2 (en) * 2001-03-02 2004-01-13 Ppg Industries Ohio, Inc. Process for electrocoating metal blanks and coiled metal substrates
US7947160B2 (en) * 2004-08-13 2011-05-24 Ppg Industries Ohio, Inc. System for coating objects
US20060032730A1 (en) * 2004-08-13 2006-02-16 Kaufman Paul J Belt conveyor apparatus
US7943028B2 (en) * 2004-08-13 2011-05-17 Ppg Industries Ohio, Inc. Method for coating objects
US7767070B2 (en) 2004-08-13 2010-08-03 Ppg Industries Ohio, Inc. Processes for coating of objects

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2906548A1 (de) * 1978-02-17 1979-09-06 Standard T Chemical Co Inc Verfahren und vorrichtung zum entfernen ueberschuessigen elektrophoretischen materials von beschichteten werkstueck-innenflaechen
DE4005620A1 (de) * 1990-02-22 1991-08-29 Plm Berlin Dosenwerk Gmbh Verfahren und vorrichtung zum anodischen oder kathodischen elektrolackieren

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3997418A (en) * 1972-11-09 1976-12-14 Aluminum Company Of America Electrophoretic coating
US4007102A (en) * 1974-01-09 1977-02-08 Kaiser Aluminum & Chemical Corporation Electrocoating aluminum sheet or strip
US3962060A (en) * 1974-10-23 1976-06-08 Aluminum Company Of America Continuous electrodeposition of coating material on metal sheet stock
DE2548414A1 (de) * 1975-07-21 1977-01-27 Standard T Chemical Co Inc Verfahren und vorrichtung zur elektrophoretischen beschichtung von gegenstaenden
US4175018A (en) * 1977-01-19 1979-11-20 Ppg Industries, Inc. Method of electrocoating
DE3108358C2 (de) * 1981-03-05 1985-08-29 Siemens AG, 1000 Berlin und 8000 München Vorrichtung zum partiellen Galvanisieren von zu elektrisch leitenden Bändern, Streifen oder dgl. zusammengefaßten Teilen im Durchlaufverfahren
DE3233517A1 (de) * 1982-09-09 1984-03-15 Siemens AG, 1000 Berlin und 8000 München Verfahren zur kontinuierlichen elektrophoretischen beschichtung von draehten

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2906548A1 (de) * 1978-02-17 1979-09-06 Standard T Chemical Co Inc Verfahren und vorrichtung zum entfernen ueberschuessigen elektrophoretischen materials von beschichteten werkstueck-innenflaechen
DE4005620A1 (de) * 1990-02-22 1991-08-29 Plm Berlin Dosenwerk Gmbh Verfahren und vorrichtung zum anodischen oder kathodischen elektrolackieren

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011156341A1 (fr) * 2010-06-11 2011-12-15 Ppg Industries Ohio, Inc. Procédé de dépôt d'une composition de revêtement électrodéposable sur un substrat à l'aide d'une pluralité de flux liquides

Also Published As

Publication number Publication date
DE4116643A1 (de) 1992-11-26
US5264096A (en) 1993-11-23
DE4116643C2 (de) 1994-06-09

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