EP0540996B1 - Procédé de peinture de corps chauffants - Google Patents

Procédé de peinture de corps chauffants Download PDF

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Publication number
EP0540996B1
EP0540996B1 EP92118393A EP92118393A EP0540996B1 EP 0540996 B1 EP0540996 B1 EP 0540996B1 EP 92118393 A EP92118393 A EP 92118393A EP 92118393 A EP92118393 A EP 92118393A EP 0540996 B1 EP0540996 B1 EP 0540996B1
Authority
EP
European Patent Office
Prior art keywords
radiators
stage
electrodeposition coating
deposited
process according
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.)
Expired - Lifetime
Application number
EP92118393A
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German (de)
English (en)
Other versions
EP0540996A1 (fr
Inventor
Thomas Dr. Brücken
Hans-Jürgen JANSEN
Helmut Dr. Fobbe
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.)
BASF Farben und Fasern AG
Original Assignee
BASF Lacke und Farben AG
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Publication date
Application filed by BASF Lacke und Farben AG filed Critical BASF Lacke und Farben AG
Publication of EP0540996A1 publication Critical patent/EP0540996A1/fr
Application granted granted Critical
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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
    • 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
    • C25D13/22—Servicing or operating apparatus or multistep processes

Definitions

  • components are compounds which can be prepared by a monofunctional starter which is carried out at 100 to 195 ° C., optionally in the presence of a catalyst, and which either has an alcoholic OH group, a phenolic OH group or carries an SH group, initiated polyaddition of a diepoxide compound and / or a mixture of diepoxide compounds, optionally together with at least one monoepoxide compound, to form an epoxy resin in which the diepoxide compound and starter are incorporated in a molar ratio of greater than 2: 1 to 10: 1 (cf. DE-OS-35 18 732).
  • the electrodeposition bath used in stage A-1 contains, in addition to the cationic amine-modified epoxy resin which has active hydrogen atoms, at least one aliphatic or cycloaliphatic blocked polyisocyanate which is part of the amine-modified epoxy resin and / or is present as a separate component. If the blocked polyisocyanate is part of the amine-modified epoxy resin, then there is a self-crosslinking resin. If the blocked polyisocyanate is present as a separate component, then an externally crosslinking resin is present. It is preferred to use an electrocoating bath in stage A-1 in which the blocked polyisocyanate is used as separate component is present.
  • blocking agents are: aliphatic alcohols, such as methyl, ethyl, chloroethyl, propyl, butyl, amyl, hexyl, heptyl, octyl, nonyl, 3,3,5-trimethylhexyl , Decyl and lauryl alcohol; cycloaliphatic alcohols such as cyclopentanol and cyclohexanol; aromatic alkyl alcohols such as phenylcarbinol and methylphenylcarbinol; Hydroxylamines such as ethanolamine; Oximes such as methyl ethyl ketoxime, acetone oxime and cyclohexanone oxime and amines such as dibutylamine and diisopropylamine. Amines such as dibutylamine and diisopropylamine are used as preferred blocking agents.
  • aliphatic alcohols such as methyl, ethyl, chloroethyl, prop
  • stage A-2 of the method according to the invention the radiators are switched as cathode and in stage A-3 a voltage of 20 to 450 V is then applied. Then, in step A-4, a paint film is deposited on the radiators by means of direct current within 5 to 120 seconds.
  • the at this stage of the The lacquer film deposited according to the method of the invention should have a dry film thickness of 1 to 20, preferably 5 to 12 »m after baking.
  • the radiators in stage D-1 of the process according to the invention are again in the electrocoating bath used in stage A-1 or in a second aqueous electrocoating bath which contains at least one active hydrogen atom, cationic amine-modified epoxy resin and at least one aliphatic or cycloaliphatic blocked polyisocyanate , which is part of the amine-modified epoxy resin and / or is present as a separate component, is immersed.
  • the second aqueous electrocoating bath preferably contains, in addition to the amine-modified epoxy resin and the blocked polyisocyanate, at least one white pigment, in particular titanium dioxide and, if appropriate, extenders, such as barium sulfate, zinc oxide, basic lead carbonate, basic lead sulfate , Aluminum silicate, kaolin, silicon dioxide, magnesium silicate etc.
  • the pigment content of the electrodeposition bath used in stage D-1 should preferably be between 20 to 40% by weight. The process according to the invention gives coatings with a high degree of whiteness.
  • the electrocoat films applied in the aforementioned steps are baked. It is also possible to overcoat the electrocoat films which have not yet been baked with a second lacquer layer which has not been applied by electrochemical deposition and then to bake the overcoated lacquer layer together with the applied electrocoat films.
  • the second layer of paint can be made using a Powder coating, an aqueous coating or a coating based on organic solvents, for example by spraying, brushing, flooding or dipping. It is also possible to burn in the electrocoat films applied by the process according to the invention and only then to apply the second coat of paint and burn it in in a separate step.
  • the second layer of lacquer can also be dispensed with.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Paints Or Removers (AREA)
  • Resistance Heating (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Forging (AREA)

Claims (9)

  1. Procédé de peinture/de laquage de corps chauffants, lors duquel
    A-1 on trempe les corps chauffants dans un premier bain aqueux de laque pour trempage électrophorétique, qui contient au moins une résine époxyde cationique, présentant des atomes d'hydrogène actifs, modifiée aux amines, et au moins un polyisocyanate bloqué aliphatique ou cycloaliphatique, qui fait partie de la résine époxyde modifiée aux amines et/ou qui est présent en tant que composant séparé, et qui présente une température de 22 à 35°C, une conductance d'au moins 1 000 »S cm⁻¹ (mesurée à 20°C) ainsi qu'une valeur pH d'au plus 7,0,
    A-2 on branche les corps chauffants en tant que cathode,
    A-3 on applique une tension de 20 à 450 V,
    A-4 on procède, en l'espace de 5 à 120 secondes, à l'aide d'un courant continu, à la déposition d'un film de laque sur les corps chauffants,
    A-5 on retire les corps chauffants du premier bain de laque pour trempage électrophorétique,
    B on élimine par rinçage la laque pour trempage électrophorétique déposée de manière non électrochimique,
    C on sèche le film de laque déposé aussi longtemps qu'il le faut pour qu'il présente une résistivité électrique d'au moins 5·10¹⁰ Ω cm,
    D-1 on trempe à nouveau les corps chauffants dans le bain de laque pour trempage électrophorétique utilisé dans l'étape A-1 ou dans un deuxième bain aqueux de laque pour trempage électrophorétique, qui contient au moins une résine époxyde cationique, présentant des atomes d'hydrogène actifs, modifiée aux amines, et au moins un polyisocyanate bloqué aliphatique ou cycloaliphatique, qui fait partie de la résine époxyde modifiée aux amines et/ou qui est présent en tant que composant séparé, et qui présente une température de 22 à 35°C, une conductance d'au moins 1 000 »S cm⁻¹ (mesurée à 20°C) ainsi qu'une valeur pH d'au plus 7,0,
    D-2 on branche les corps chauffants en tant que cathode, l'anode étant choisie de sorte que le quotient de la surface active de l'anode et de la surface encore à laquer des corps chauffants soit supérieur à 0,05,
    D-3 on applique une tension de 50 à 500 V,
    D-4 on procède, en l'espace de 60 à 240 secondes, à l'aide d'un courant continu, à la déposition d'un film de laque sur les corps chauffants,
    D-5 on retire les corps chauffants du bain de laque pour trempage électrophorétique,
    E on élimine par rinçage la laque pour trempage électrophorétique déposée de manière non électrochimique et
    F on procède à la cuisson des films de laque pour trempage électrophorétique ainsi appliqués, les corps chauffants laqués par trempage électrophorétique étant encore soumis, avant ou après la cuisson des films de laque pour trempage électrophorétique, le cas échéant, à un surlaquage à l'aide d'une couche de laque supplémentaire.
  2. Procédé selon la revendication 1, caractérisé en ce que le bain de laque pour trempage électrophorétique utilisé dans l'étape A-1 et le bain de laque pour trempage électrophorétique utilisé dans l'étape D-1 contiennent un pigment blanc et, le cas échéant, des pigments de charge minéraux, et présentent une teneur en pigments de 20 à 40 % en poids.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que le bain de laque pour trempage électrophorétique utilisé dans l'étape A-1 présente une température de 24 à 28°C.
  4. Procédé selon l'une quelconque des revendications 1 à 3, caractérisé en ce que le bain de laque pour trempage électrophorétique utilisé dans l'étape D-1 présente une température de 28 à 32°C.
  5. Procédé selon l'une quelconque des revendications 1 à 4, caractérisé en ce que le bain de laque pour trempage électrophorétique utilisé dans l'étape A-1 présente une conductance d'au moins 1 300 »S cm⁻¹ (mesurée à 20°C), de préférence d'au moins 1 500 »S cm⁻¹ (mesurée à 20°C).
  6. Procédé selon l'une quelconque des revendications 1 à 5, caractérisé en ce que le bain de laque pour trempage électrophorétique utilisé dans l'étape D-1 présente une conductance d'au moins 1 300 »S cm⁻¹ (mesurée à 20°C), de préférence d'au moins 1 500 »S cm⁻¹ (mesurée à 20°C).
  7. Procédé selon l'une quelconque des revendications 1 à 6, caractérisé en ce que le bain de laque pour trempage électrophorétique utilisé dans l'étape A-1 présente une valeur pH d'au plus 6,5, de préférence d'au plus 6,0.
  8. Procédé selon l'une quelconque des revendications 1 à 7, caractérisé en ce que le bain de laque pour trempage électrophorétique utilisé dans l'étape D-1 présente une valeur pH d'au plus 6,5, de préférence d'au plus 6,0.
  9. Procédé selon l'une quelconque des revendications 1 à 8, caractérisé en ce que, dans l'étape D-2, l'anode est choisie de sorte que le quotient de la surface active de l'anode et de la surface encore à laquer des corps chauffants est supérieur à 0,1, de préférence supérieur à 0,25.
EP92118393A 1991-11-02 1992-10-28 Procédé de peinture de corps chauffants Expired - Lifetime EP0540996B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4136237 1991-11-02
DE4136237A DE4136237A1 (de) 1991-11-02 1991-11-02 Verfahren zur lackierung von heizkoerpern

Publications (2)

Publication Number Publication Date
EP0540996A1 EP0540996A1 (fr) 1993-05-12
EP0540996B1 true EP0540996B1 (fr) 1995-08-30

Family

ID=6444032

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92118393A Expired - Lifetime EP0540996B1 (fr) 1991-11-02 1992-10-28 Procédé de peinture de corps chauffants

Country Status (5)

Country Link
EP (1) EP0540996B1 (fr)
AT (1) ATE127170T1 (fr)
DE (2) DE4136237A1 (fr)
DK (1) DK0540996T3 (fr)
ES (1) ES2079766T3 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19635560A1 (de) * 1996-09-02 1998-03-05 Basf Lacke & Farben Porenfreie Beschichtung von Metallbehältern
DE202005018502U1 (de) * 2005-11-21 2006-03-23 Kermi Gmbh Hygieneheizkörper

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1621930A1 (de) * 1966-11-16 1971-06-09 Gea Luftkuehler Happel Gmbh Verfahren und Vorrichtung zum elektrophoretischen Beschichten von metallischen Gegenstaenden
IT1075015B (it) * 1975-07-21 1985-04-22 Standard T Chemical Co Inc Metodo ed apparato per il rivestimento elettroforetico di superfici

Also Published As

Publication number Publication date
DE59203462D1 (de) 1995-10-05
DK0540996T3 (da) 1996-01-08
DE4136237A1 (de) 1993-05-06
ATE127170T1 (de) 1995-09-15
EP0540996A1 (fr) 1993-05-12
ES2079766T3 (es) 1996-01-16

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