EP1257368B1 - Procede de realisation sur des carrosseries d'automobile de recouvrements de peinture multicouches colores et/ou a effet - Google Patents

Procede de realisation sur des carrosseries d'automobile de recouvrements de peinture multicouches colores et/ou a effet Download PDF

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Publication number
EP1257368B1
EP1257368B1 EP01905723A EP01905723A EP1257368B1 EP 1257368 B1 EP1257368 B1 EP 1257368B1 EP 01905723 A EP01905723 A EP 01905723A EP 01905723 A EP01905723 A EP 01905723A EP 1257368 B1 EP1257368 B1 EP 1257368B1
Authority
EP
European Patent Office
Prior art keywords
process according
surfacer
aqueous
electrostatic
cured
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
EP01905723A
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German (de)
English (en)
Other versions
EP1257368A2 (fr
Inventor
Joachim Woltering
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 Coatings GmbH
Original Assignee
BASF Coatings GmbH
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 BASF Coatings GmbH filed Critical BASF Coatings GmbH
Publication of EP1257368A2 publication Critical patent/EP1257368A2/fr
Application granted granted Critical
Publication of EP1257368B1 publication Critical patent/EP1257368B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • B05D7/53—Base coat plus clear coat type
    • B05D7/534—Base coat plus clear coat type the first layer being let to dry at least partially before applying the second layer
    • 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
    • B05D7/53—Base coat plus clear coat type
    • B05D7/536—Base coat plus clear coat type each layer being cured, at least partially, separately
    • 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
    • B05D3/0209—Multistage baking
    • 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
    • B05D7/56—Three layers or more
    • B05D7/57—Three layers or more the last layer being a clear coat
    • B05D7/574—Three layers or more the last layer being a clear coat at least some layers being let to dry at least partially before applying the next layer
    • 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
    • B05D7/56—Three layers or more
    • B05D7/57—Three layers or more the last layer being a clear coat
    • B05D7/576—Three layers or more the last layer being a clear coat each layer being cured, at least partially, separately

Definitions

  • the present invention relates to a novel process for producing multicoat color and / or effect paint systems on automobile bodies in which a powder slurry clearcoat is used.
  • the inner parts of the automobile bodies are usually first painted by pneumatic spraying or compressed air spraying.
  • the pneumatic spraying is chosen because the cavities and depressions due to the formation of Faraday cages are difficult to electrostatically coat.
  • the object of the present invention is to find a new process for the production of multicoat color and / or effect paint systems on automobile bodies that no longer has the disadvantages of the prior art but, even when using powder slurry clearcoats, provides coatings which do not have visible elevations or flow defects more.
  • the new process for producing multicoat color and / or effect paint systems on automobile bodies is referred to below as the "process according to the invention”.
  • the new process causes that located on the outer skin of the car body, applied by electrostatic painting, wet powder slurry clearcoat layers can easily absorb the spray mist droplets from the interior painting, whereby a much better flow is achieved.
  • the automobile bodies used in the method according to the invention usually have a cathodically deposited and thermally cured electrodeposition coating. However, they may also have a cathodically deposited electrodeposition coating which is not thermally cured, but merely dried or partially cured.
  • the electrodeposition coating or the electrodeposition coating layer can be overcoated with a filler which is cured either alone or together with the electrodeposition coating layer (wet-in-wet process).
  • the coating with a filler takes place in particular in the areas which are exposed to a strong mechanical stress, such as by stone chipping.
  • suitable fillers in particular aqueous fillers, which are also referred to as antistonechip primers or functional layers, for example from the patents US 4,537,926 A1 . EP 0 529 335 A1 . EP 0 595 186 A1 . EP 0 639 660 A1 . DE 44 38 504 A1 . DE 43 37 961 A1 . WO 89/10387 . US 4,450,200 A1 . US 4,614,683 A1 or WO 490/26827 described.
  • these fillers can also be applied to the baked electrodeposition coatings and then pre-dried or partially thermally cured. In this variant of the method according to the invention, they are then cured together with the aqueous basecoat films and powder slurry clearcoat films applied to the surfacer layers (extended wet-on-wet process).
  • the surfacer coatings are coated with water-based paints.
  • suitable aqueous basecoats in particular waterborne basecoats based on polyurethane, are from the patents EP 0 089 497 A1 .
  • EP 0 708 788 A1 are from the patents EP 0 089 497 A1 .
  • the resulting aqueous basecoat films are not cured, but pre-dried or partially cured.
  • the aqueous powder clearcoat materials are applied to the aqueous basecoat films, resulting in powder slurry clearcoat films.
  • suitable powder slurry clearcoats are known from U.S. Patent US-A-4,268,542 and the patent applications DE 195 40 977 A1 . DE 195 18 392 A1 . DE 196 17 086 A1 . DE-A-196 13 547 . EP 0 652 264 A1 . DE 196 18 657 A1 . DE 196 52 813 A1 . DE 196 17 086 A1 or DE-A-198 14 471 A1 known.
  • the aqueous powder clearcoats are applied by electrostatic painting the body exterior parts, followed by pneumatic spraying (compressed air spraying) of the body interior parts.
  • the electrostatic coating can be carried out by means of an electrostatic spray gap, an electrostatic spray bell or an electrostatic spray disc.
  • the electrostatic coating can be done by electrostatic assisted mechanical atomization. Preferably, this is performed by means of electrostatic high rotation disks or high rotation bells.
  • pneumatic spraying or air pressure painting has no special features, but can be done by hand or with the help of conventional and known paint sprayers or robots.
  • the application is carried out when illuminated with visible light of a wavelength of about 550 microns or in the absence of light, when the aqueous basecoat materials and / or the powder slurry clearcoats are curable thermally and with actinic radiation.
  • visible light a wavelength of about 550 microns or in the absence of light
  • the aqueous basecoat materials and / or the powder slurry clearcoats are curable thermally and with actinic radiation.
  • the coating materials to be used according to the invention are applied in a wet layer thickness such that, after their curing, coatings result with the layer thicknesses necessary and advantageous for their functions.
  • a basecoat they are from 5 to 50, preferably from 5 to 40, particularly preferably from 5 to 30 and in particular from 10 to 25 ⁇ m, and in the case of a clearcoat they are from 10 to 100, preferably from 15 to 80, particularly preferably from 20 to 75 and in particular 25 to 70 microns.
  • the aqueous basecoat films are cured thermally or thermally and with actinic radiation together with the powder slurry clearcoat films and, if appropriate, the underlying non or fully cured coating films. Curing with heat and with actinic radiation is also referred to in the art as dual cure.
  • actinic radiation means electromagnetic radiation such as near infrared (NIR), visible light, UV light or X-radiation, but in particular UV light, or corpuscular radiation such as electron radiation.
  • the curing can take place after a certain rest period or ventilation time. It may have a duration of 30 seconds to 2 hours, preferably 1 minute to 1 hour, and especially 1 minute to 45 minutes.
  • the rest period serves, for example, for the course and degassing of the layers and for evaporation of volatile constituents, such as any remaining solvent and / or water.
  • this cure can be supplemented with actinic radiation from other sources.
  • electron beams it is preferable to operate under an inert gas atmosphere. This can be ensured, for example, by supplying carbon dioxide and / or nitrogen directly to the surface of the clearcoat film. Even in the case of curing with UV radiation, to avoid the formation of ozone, under inert gas can be used.
  • the usual and known radiation sources and optical aids are used.
  • suitable radiation sources are flash lamps from the company VISIT, mercury high- or low-pressure vapor lamps, optionally doped with lead, to open a beam window up to 405 nm, or electron beam sources.
  • Their arrangement is known in principle and can be adapted to the conditions of the workpiece and the process parameters.
  • the non-direct radiation accessible areas such as cavities, folds and other design undercuts with point, small area or omnidirectional, associated with an automatic moving device for the irradiation of cavities or Edges, (partially) cured.
  • the curing can be done in stages, d. H. by multiple exposure or irradiation with actinic radiation. This can also be done alternately, d. h., That is cured alternately with UV radiation and electron radiation.
  • the thermal curing has no special features, but takes place by the usual and known methods such as heating in a convection oven or irradiation with IR and / or NIR lamps. As in the case of curing with actinic radiation, the thermal curing can also take place in stages. Advantageously, the thermal curing takes place at temperatures of 90 ° C to 180 ° C.
  • thermal curing and curing with actinic radiation can be used simultaneously or sequentially. Be the two Hardening methods used sequentially, for example, can be started with the thermal curing and terminated with the curing with actinic radiation. In other cases, it may be advantageous to begin and terminate curing with actinic radiation.
  • multi-layer color and / or effect coating can still be coated with a layer of an organically modified ceramic material, such as is commercially available, for example, under the brand Ormocer®.
  • the color and / or effect multicoat paint systems produced in accordance with the method of the invention have a particularly high gloss.
  • they In comparison with the multicoat paint systems produced in the usual and known manner, they have significantly less haze and hardly any disturbing surface structures, such as orange peel structures. They are therefore of particularly high optical quality. Since the other advantages of aqueous basecoats and powder slurry clearcoats are fully retained, they are of particularly high technical and economic value to users and their customers.
  • spray mist of a customary and known powder slurry clearcoat was applied to the surface of test panels coated with a black basecoat and flashed off for two minutes at room temperature. Subsequently, the powder slurry clearcoat was in Wedge shape applied over the spray mist droplets and flashed off for two minutes at room temperature. Subsequently, spray mist droplets and powder slurry clearcoats wedge were pre-dried at 40 ° C for 10 minutes and then baked at 150 ° C for 30 minutes.
  • the waviness of the powder slurry clearcoats of the example and the comparative experiment was measured by means of the wavescan method.
  • a laser beam was directed onto the surface at an angle of 60 °, and the fluctuations of the reflected light in a so-called long wave range (0.6 to 10 mm, observation distance: 2.5 m) and in the so-called short wave range (0.1 to 0.6 mm, observation distance: 45 cm) registered with the aid of a measuring device.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Paints Or Removers (AREA)

Claims (8)

  1. Procédé de préparation de vernis multicouches colorés et/ou à effet pour carrosseries automobiles, par :
    (I) application d'un vernis à base aqueuse sur la carrosserie et séchage ou durcissement partiel de la couche de vernis à base aqueuse résultante,
    (II) application d'une suspension aqueuse de vernis clair en poudre sur la couche de vernis à base aqueuse séchée ou partiellement durcie (II) et
    (III) durcissement des couches (I) et (II) par voie thermique ou par voie thermique et rayonnement actinique (double durcissement, "dual cure"),
    caractérisé en ce que l'application de la suspension aqueuse de vernis clair en poudre (II) est réalisée par :
    (IIa) vernissage électrostatique des parties extérieures de carrosserie, suivi de
    (IIb) pulvérisation pneumatique (pulvérisation à air comprimé) des parties intérieures de
    carrosserie.
  2. Procédé suivant la revendication 1, caractérisé en ce que le vernissage électrostatique (IIa) est réalisé au moyen d'une buse de pulvérisation électrostatique à fente, d'une cloche de pulvérisation électrostatique ou d'un disque de pulvérisation électrostatique.
  3. Procédé suivant la revendication 1, caractérisé en ce que le vernissage électrostatique (IIa) est réalisé par atomisation mécanique avec assistance électrostatique.
  4. Procédé suivant la revendication 3, caractérisé en ce que l'atomisation mécanique avec assistance électrostatique est entreprise à l'aide de disques ou cloches électrostatiques tournant à grande vitesse.
  5. Procédé suivant l'une quelconque des revendications 1 à 4, caractérisé en ce que, avant l'application du vernis à base aqueuse, on applique une couche d'apprêt sur la carrosserie et que la couche d'apprêt résultante est durcie ou, alternativement, qu'on applique sur la carrosserie une couche d'apprêt et que la couche d'apprêt résultante est ensuite séchée ou partiellement durcie.
  6. Procédé suivant la revendication 5, caractérisé en ce que l'on utilise une couche d'apprêt aqueuse.
  7. Procédé suivant l'une quelconque des revendications 1 à 6, caractérisé en ce que l'on utilise un vernis à base aqueuse et à base de polyuréthanne.
  8. Procédé suivant l'une quelconque des revendications 1 à 7, caractérisé en ce que la carrosserie est revêtue d'un enduit électrophorétique à dépôt cathodique, qui est durci ou séché par voie thermique avant l'application de la couche d'apprêt, ou partiellement durci par voie thermique et cuit ensuite en même temps que la couche d'apprêt.
EP01905723A 2000-02-25 2001-02-01 Procede de realisation sur des carrosseries d'automobile de recouvrements de peinture multicouches colores et/ou a effet Expired - Lifetime EP1257368B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10008946A DE10008946C1 (de) 2000-02-25 2000-02-25 Verfahren zur Herstellung farb- und/oder effektgebender Mehrschichtlackierungen auf Automobilkarosserien
DE10008946 2000-02-25
PCT/EP2001/001081 WO2001062401A2 (fr) 2000-02-25 2001-02-01 Procede de realisation sur des carrosseries d'automobile de recouvrements de peinture multicouches colores et/ou a effet

Publications (2)

Publication Number Publication Date
EP1257368A2 EP1257368A2 (fr) 2002-11-20
EP1257368B1 true EP1257368B1 (fr) 2007-10-31

Family

ID=7632431

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01905723A Expired - Lifetime EP1257368B1 (fr) 2000-02-25 2001-02-01 Procede de realisation sur des carrosseries d'automobile de recouvrements de peinture multicouches colores et/ou a effet

Country Status (9)

Country Link
US (1) US7504134B2 (fr)
EP (1) EP1257368B1 (fr)
AT (1) ATE376890T1 (fr)
AU (1) AU2001233731A1 (fr)
BR (1) BR0108686A (fr)
CA (1) CA2400621C (fr)
DE (2) DE10008946C1 (fr)
MX (1) MXPA02006950A (fr)
WO (1) WO2001062401A2 (fr)

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US20100183820A1 (en) * 2009-01-16 2010-07-22 Ford Global Technologies, Llc Methods for curing uv-curable coatings
US9260117B2 (en) * 2012-04-12 2016-02-16 Trinity Industries, Inc. Composite roof conversion

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US7504134B2 (en) 2009-03-17
DE50113194D1 (de) 2007-12-13
DE10008946C1 (de) 2001-10-18
US20030108681A1 (en) 2003-06-12
ATE376890T1 (de) 2007-11-15
EP1257368A2 (fr) 2002-11-20
WO2001062401A2 (fr) 2001-08-30
AU2001233731A1 (en) 2001-09-03
WO2001062401A3 (fr) 2002-03-14
CA2400621C (fr) 2008-01-15
BR0108686A (pt) 2002-11-12
MXPA02006950A (es) 2003-03-27
CA2400621A1 (fr) 2001-08-30

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