EP1981648A1 - Amelioration du nettoyage d'un appareil d'application de laque - Google Patents

Amelioration du nettoyage d'un appareil d'application de laque

Info

Publication number
EP1981648A1
EP1981648A1 EP07703129A EP07703129A EP1981648A1 EP 1981648 A1 EP1981648 A1 EP 1981648A1 EP 07703129 A EP07703129 A EP 07703129A EP 07703129 A EP07703129 A EP 07703129A EP 1981648 A1 EP1981648 A1 EP 1981648A1
Authority
EP
European Patent Office
Prior art keywords
paint application
paint
titanium
aluminum
application devices
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Withdrawn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
EP07703129A
Other languages
German (de)
English (en)
Inventor
Steffen RÜSSE
Marcus Sonner
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.)
Henkel AG and Co KGaA
Original Assignee
Henkel AG and Co KGaA
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 Henkel AG and Co KGaA filed Critical Henkel AG and Co KGaA
Publication of EP1981648A1 publication Critical patent/EP1981648A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
    • C25D11/02—Anodisation
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
    • C25D11/02—Anodisation
    • C25D11/024—Anodisation under pulsed or modulated current or potential
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
    • C25D11/02—Anodisation
    • C25D11/04—Anodisation of aluminium or alloys based thereon
    • C25D11/06—Anodisation of aluminium or alloys based thereon characterised by the electrolytes used
    • C25D11/08—Anodisation of aluminium or alloys based thereon characterised by the electrolytes used containing inorganic acids
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
    • C25D11/02—Anodisation
    • C25D11/04—Anodisation of aluminium or alloys based thereon
    • C25D11/18—After-treatment, e.g. pore-sealing
    • C25D11/24—Chemical after-treatment
    • C25D11/246—Chemical after-treatment for sealing layers
    • 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

Definitions

  • the present invention is in the field of painting articles using paint applicators that typically rotate very fast. Such lacquer application devices are often referred to in practice as "bells.” Deposited lacquer on the lacquer application devices must be removed from time to time.Therefore, in practice, aqueous or solvent-based cleaners are available. The invention relates to a process for facilitating this purification step.
  • lacquer can be deposited in the shade of the spray cone due to turbulences. This paint dries. The inner areas of the rotating bell are easy to clean. There, the centrifugal force at high speed (20-60000 revolutions per minute) causes a high contact pressure and removal of the paint material. At the outer cone the centrifugal force causes exactly the opposite. The cleaning solution is spun off. With a so-called shaping air, this process is more or less effectively counteracted.
  • the present invention relates, in a first aspect, to a process for the pretreatment of paint application equipment made of aluminum, titanium or alloys, each consisting of more than 50 atomic% of aluminum or titanium, to facilitate the removal of paint deposited on the paint application equipment, characterized in that the lacquer application devices are anodically oxidized in an aqueous electrolyte prior to the use of the lacquer application devices or that a coating of oxides and / or nitrides of aluminum and / or titanium is applied to them by chemical or physical gas-phase deposition.
  • a salt and / or acidic aqueous electrolyte For anodic oxidation, it is preferable to use DC or AC superimposed DC. Pulsed electricity is also usable.
  • the duration of treatment and the electrical voltage or the current density are preferably set such that an oxide layer with a thickness in the range of 10 nm to 10 ⁇ m is formed.
  • the voltage may be in the range of 10 to 100 V
  • the treatment time in the range of 1 to 30 minutes, preferably in the range of 5 to 10 minutes.
  • Measures to temper the electrolyte are usually not required. This means that the anodic oxidation can take place in an electrolyte at room temperature, whereby the electrolyte can be heated during the anodization.
  • the surfaces can be "densified" in a manner known in principle following the anodic oxidation For example, this can be done by bringing the anodized surfaces into contact with steam or with liquid water having a temperature of at least 80 ° C., preferably with boiling water in the same order of magnitude as the duration of the anodic oxidation, that is, for example, in the range of 1 to 30 minutes.
  • the alternative to anodic oxidation is to apply a coating of oxides and / or nitrides of aluminum and / or titanium to the paint application equipment by chemical or physical vapor deposition. It is advisable to select for coating oxides and / or nitrides of that metal which corresponds to the material to be coated. In particular, this method is suitable for the pretreatment of paint application equipment consisting of titanium or of an alloy containing more than 50 atom% of titanium. On these paint application devices, a coating of titanium oxide and / or titanium nitride is preferably applied by chemical or physical vapor deposition.
  • the method according to the invention for the pretreatment of the paint application devices is therefore preferably carried out for such a time duration that the surface of the paint application devices appears blue to the human eye. Then it is easy to detect contamination of the paint application devices with gray to silver metallic paints. During the subsequent cleaning, It is easy to visually check how far the cleaning process has progressed.
  • the present invention relates to a paint applicator having a coating obtainable by the method described above.
  • the paint application device according to the invention thus carries, as a result of the method used for its pretreatment, either an oxide layer, as can be produced by anodic oxidation, or an oxide or nitride layer, which can be produced by physical or chemical vapor deposition.
  • this layer has a thickness such that it appears blue to the human eye due to the interference effect of light rays.
  • the present invention relates to a method for painting surfaces such as surfaces of vehicles, household appliances or pieces of furniture, which is characterized in that a paint application device pretreated according to the invention is used for the application of the paint.
  • a paint application device pretreated according to the invention is used for the application of the paint.
  • paint is deposited on the paint application device, it is brought into contact with a cleaning solution known per se in the prior art in order to remove the paint deposits.
  • the contact of the contaminated paint application device with the cleaning solution can be effected, for example, by immersing the paint application device in the cleaning solution. In practice, however, it is more common to spray the paint application device with the cleaning solution. In particular, the cleaning solution may be sprayed onto the paint application device while it is rotating.
  • the coating formed by the method according to the invention for pretreatment on the surface of the paint application device ensures that the cleaning process runs faster than with paint application devices without this pretreatment. This shortens the time required for cleaning and thereby increases the productivity of the paint shop.
  • the choice of cleaning agent depends mainly on whether the paint application device is contaminated with solvent-based or water-based paints.
  • Detergents containing organic solvents such as butyl glycol, butanol or comparable alcohols or ethers may be used for both types of coating. Examples of corresponding prior art can be found in the introductory part of EP-A-1 606 377.
  • Such cleaning agents can also be used to clean the paint application equipment pretreated according to the invention. However, technical measures must be taken to minimize the exposure of ambient air to volatile organic compounds (VOCs). Therefore, it is preferred to use detergents that result in a reduced VOC load.
  • VOCs volatile organic compounds
  • Such a cleaning agent is described, for example, in US Pat. No. 5,632,822. Advantages of the pretreatment of the paint application devices according to the invention are particularly evident when cleaning solutions which are advantageous in terms of application are used for cleaning, which form the subject matter of said EP-A-1 606 377.
  • a cleaning solution for purifying the paint application equipment pretreated according to the invention which contains the following active ingredients besides water: a) water-miscible alkyl and / or hydroxyalkylamines having one to three alkyl or hydroxyalkyl groups in the molecule in such an amount in that the pH of the cleaning solution is in the range from 10 to 13, b) from 0.01 to 2% by weight of alkyl alcohol or alkylamine ethoxylates having 8 to 22 carbon atoms in the alkyl radical and with an average of from 8 to 15 ethylene oxide units in the molecule , whose terminal -OH group may be free or etherified with an alcohol having 1 to 4 carbon atoms, c) 0.01 to 2 wt .-% alkyl alcohol or Alkylaminethoxylate having 8 to 22 carbon atoms in the alkyl radical and with im Average 0.5 to 5 ethylene oxide units in the molecule, whose terminal -OH
  • the surface is better wettable and the cleaner can infiltrate / remove the dried coating layer faster.
  • the interference color of the oxide layer is adjustable. Since silver metallic is currently a much used shade, the bell can be colored (dark blue) so that silver metallic residues can be seen much better than on bare Ti / Al.
  • the high hardness of the oxide layer ensures that the coating pigments hardly lead to abrasion even at high speed.
  • the oxide layer can be replicated at any time by renewed anodic oxidation.
  • the oxide layer has a high chemical resistance compared to organic coatings.
  • the oxide layer compensates for small scratches, the surface is more homogeneous, the paint adhesion decreases.
  • the method according to the invention in comparison to untreated surfaces can be tested in laboratory tests on differently prepared samples.
  • sample preparation There are two ways of sample preparation: a) Up to 48 hours before cleaning, the sample plate is painted with the paint to be scoured. At the time of the experiment, the paint must be dried. This procedure should be used with easy-to-remove water-based paints (physical drying only) to get the greatest possible resolution within the timescale. b) Variant a) does not lead to success in rapidly crosslinking 1-component paint systems or 2-component systems. These lacquers are either only briefly dried (maximum 5 minutes at room temperature) or freshly doctored onto the sample plate and then tested directly.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

L'invention concerne un procédé de prétraitement d'un appareil d'application de laque en aluminium, titane ou leurs alliages, destiné à éliminer facilement la laque isolée de l'appareil d'application de laque, ledit appareil d'application de laque étant oxydé anodiquement dans un électrolyte aqueux et un revêtement d'oxyde et/ou de nitrure d'aluminium et/ou de titane étant formé à sa surface par séparation en phase gazeuse. L'objet de l'invention est notamment réalisé dans des conditions telles que la surface de l'appareil d'application de laque apparaisse bleue à l'œil humain. Ce prétraitement permet de faciliter l'élimination des dépôts de laque. L'invention concerne également ledit appareil d'application de laque et son nettoyage.
EP07703129A 2006-02-07 2007-01-30 Amelioration du nettoyage d'un appareil d'application de laque Withdrawn EP1981648A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200610005765 DE102006005765A1 (de) 2006-02-07 2006-02-07 Verbesserung der Reinigung von Lackapplikationsgeräten
PCT/EP2007/000774 WO2007090541A1 (fr) 2006-02-07 2007-01-30 Amelioration du nettoyage d'un appareil d'application de laque

Publications (1)

Publication Number Publication Date
EP1981648A1 true EP1981648A1 (fr) 2008-10-22

Family

ID=37897732

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07703129A Withdrawn EP1981648A1 (fr) 2006-02-07 2007-01-30 Amelioration du nettoyage d'un appareil d'application de laque

Country Status (3)

Country Link
EP (1) EP1981648A1 (fr)
DE (1) DE102006005765A1 (fr)
WO (1) WO2007090541A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008056411A1 (de) 2008-11-07 2010-05-20 Dürr Systems GmbH Beschichtungsanlagenbauteil, insbesondere Glockenteller, und entsprechendes Herstellungsverfahren
DE102009057444A1 (de) * 2009-12-08 2011-06-09 Dürr Systems GmbH Lackieranlagenbauteil mit einer Oberflächenbeschichtung

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3355385A (en) * 1965-06-18 1967-11-28 Pennsalt Chemical Corp Process for removing organic coatings
JPS6135868A (ja) * 1984-07-27 1986-02-20 Toyota Central Res & Dev Lab Inc 塗装装置の回転霧化頭
JPS63229163A (ja) * 1987-03-19 1988-09-26 Toyota Motor Corp 回転霧化静電塗装装置の噴霧頭
DE4439924A1 (de) * 1994-11-08 1996-05-09 Bayerische Motoren Werke Ag Verwendung von kohlenstoffhaltigen Schichten
US5923944A (en) * 1995-10-20 1999-07-13 General Electric Company Fluid containment article for hot hydrocarbon fluid and method of forming a coating thereon
DE19621818A1 (de) * 1996-05-31 1997-12-04 Henkel Kgaa Kurzzeit-Heißverdichtung anodisierter Metalloberflächen mit tensidhaltigen Lösungen
DE19732378A1 (de) * 1997-02-18 1998-08-27 Kristian S Dipl Chem D Oeffner Polyurethanschaumentferner für verschiedene Untergründe
DE29807059U1 (de) * 1998-04-20 1998-07-02 E.I.C. Group Engineering Innovations Consulting GmbH, 63128 Dietzenbach Vorrichtung zum Zerstäuben von flüssigem Material
FR2836638B1 (fr) * 2002-03-01 2004-12-10 Sames Technologies Dispositif de pulverisation de produit de revetement liquide
DE10313461A1 (de) * 2003-03-26 2004-10-07 Henkel Kgaa Reinigungslösung und Reinigungsverfahren für Lackleitungen und/oder Lackauftragsgeräte
GB0308021D0 (en) * 2003-04-07 2003-05-14 Aerstream Technology Ltd Spray electrode
US20040195395A1 (en) * 2003-04-07 2004-10-07 Mclaughlin Michael S. Method and apparatus for spray nozzle improvement through the use of surface and sub-surface coatings

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2007090541A1 *

Also Published As

Publication number Publication date
DE102006005765A1 (de) 2007-08-09
WO2007090541A1 (fr) 2007-08-16

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