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WO2009121455A2 - Procédé de fabrication de tôles enduites transformables et tôles enduites selon ce procédé - Google Patents

Procédé de fabrication de tôles enduites transformables et tôles enduites selon ce procédé Download PDF

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Publication number
WO2009121455A2
WO2009121455A2 PCT/EP2009/001476 EP2009001476W WO2009121455A2 WO 2009121455 A2 WO2009121455 A2 WO 2009121455A2 EP 2009001476 W EP2009001476 W EP 2009001476W WO 2009121455 A2 WO2009121455 A2 WO 2009121455A2
Authority
WO
WIPO (PCT)
Prior art keywords
clearcoat
paint
microns
layer
sheet metal
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
PCT/EP2009/001476
Other languages
German (de)
English (en)
Other versions
WO2009121455A3 (fr
Inventor
Alexandra Huber
Lothar Jandel
Dorothe Koberg
Bernhard Strauss
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.)
Voestalpine Stahl GmbH
BASF Coatings GmbH
Original Assignee
Voestalpine Stahl GmbH
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 Voestalpine Stahl GmbH, BASF Coatings GmbH filed Critical Voestalpine Stahl GmbH
Priority to EP09728249.5A priority Critical patent/EP2257389B1/fr
Publication of WO2009121455A2 publication Critical patent/WO2009121455A2/fr
Publication of WO2009121455A3 publication Critical patent/WO2009121455A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • B05D7/14—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
    • B05D7/56—Three layers or more
    • B05D7/57—Three layers or more the last layer being a clear coat
    • 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
    • B05D2252/00—Sheets
    • B05D2252/02—Sheets of indefinite length
    • 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
    • B05D2401/00—Form of the coating product, e.g. solution, water dispersion, powders or the like
    • 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
    • B05D2701/00—Coatings being able to withstand changes in the shape of the substrate or to withstand welding
    • 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
    • B05D3/12—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 mechanical means

Definitions

  • the invention relates to a method for the manufacture of ready-coated formable sheets for the automotive sector and for domestic appliance and construction applications and the like.
  • Paint is a very investment-intensive and cost-intensive process.
  • the painting after the body is assembled usually several layers are applied and in particular after phosphating first a corrosion protection primer (KTL) is applied, then a single or multi-layer, color-giving paint with a final clearcoat.
  • KTL corrosion protection primer
  • tape coating or coil coating processes are known. These are processes in which paint is applied by roller application with an efficiency of nearly 100% on metal strips, the penetration takes place in largely closed systems with thermal utilization of the solvents used. VOC emissions are kept at very low levels with this technology.
  • pre-painted material after forming shows significant surface changes as a result of microscopic deformation processes in the metal substrate and the organic coating.
  • the deformation processes in the polymeric coating are due, inter alia, to the formation of flow lines, which are partially reversible, but cause a gloss drop of the coating in reshaped areas.
  • attempts have been made to further develop the paints although all known paint systems still have a measurable loss of gloss depending on the degree of deformation, even if this could be reduced.
  • the areas with the reduced loss of gloss by changing the paint systems also have a surface that does not meet the requirements of an automobile outer skin.
  • all previously known paint structures after stretching, in addition to gloss also show a strong susceptibility to cracking as a result of heat treatment.
  • DE 100 47 982 A1 discloses a multicoat color and / or effect paint system with at least two superimposed clearcoats of different hardness and flexibility, this paint coating serving as a rockfall protection layer.
  • a flexible powder clearcoat or a flexible powder slurry clearcoat is present, to which a second hard scratch-resistant powder clearcoat and / or powder slurry clearcoat is applied.
  • EP 1 348 001 B1 discloses a clearcoat film which is part of a multicoat system comprising a top clearcoat layer which is suitable for the production of precoated metal strips, from which parts for automobiles can be produced by appropriate shaping processes (deep drawing).
  • the intermediate clear coat layer and the top clearcoat layer differ in that the intermediate coat layer has a higher flexibility than the topcoat layer.
  • the object of the invention is to provide a method for producing finished pre-painted formable sheets with a decorative and protective clearcoat surface, which also after forming painted coated sheets gives a high surface quality.
  • a paint system is formed in a multi-layered manner with at least three layers, the outer two layers being formed by a two-layer clearcoat.
  • the two-layer clearcoat builds on a fluorine-free binder chemistry, such as. B. PUR-crosslinked acrylate and polyester clearcoats.
  • methacrylate copolymers for which acrylic acid, butanediol monoacrylate, butyl acrylate, butyl methacrylate, cyclohexyl methacrylate, hydroxyethyl methylacrylate, hydroxypropyl methacrylate styrene are suitable as building blocks.
  • the preferred choice of these building blocks and their combination for the particular methacrylate copolymer depends on whether the clearcoats should be more flexible or rather hard.
  • Typical inventive layer thicknesses for the two-layer clearcoat have, for the first clearcoat layer, ie the clearcoat layer, which is applied to a coloring lacquer layer (intermediate clear coat) 3 to 30 ⁇ m and preferably 5 to 20 ⁇ m.
  • the second clearcoat (covercoat) which is the outwardly facing clearcoat sits a thickness of 5 to 30 microns and preferably 10 to 25 microns.
  • thermomechanical properties of the two clearcoat films are adjusted to one another in the crosslinked state, wherein the softening points and the tan ⁇ max values are set according to the invention.
  • the thermomechanical properties are determined on free paint films by means of dynamic mechanical analysis (DMA) at 1 Hz and a heating rate of 2 K / min.
  • the Tg values are determined according to the "Practice of Thermal Analysis of Plastics", 2nd edition, Hanser Verlag, Kunststoff 2003 from the temperature situation at the loss modulus Maximum tan ⁇ max of the DMA measurements.
  • the top clear coat have a Tg ⁇ 80 0 C and the intermediate clearcoat in the crosslinked state in the crosslinked state has a Tg ⁇ 60 0 C.
  • the two cover clearcoats are adjusted according to the invention in terms of their ratio of strength and elasticity so that they meet different stress profiles.
  • a ratio of the tan ⁇ max values of topcoat lacquer to intermediate clearcoat lacquer ⁇ 0.6 and preferably ⁇ 0.9 is maintained for components with a high degree of stress in terms of deep drawability.
  • painted panels can be achieved, which are characterized in that the formed parts also after a heat treatment step at temperatures> Tg remain free of cracks (eg 15 minutes at 120 0 C.), and that the paint system that is optimized for the folding, deformation strains of ⁇ 2 T in accordance with DIN EN 13523-7: 2001 and the thermoformable optimized structure Dehngrade of> 20% crack-free and thermally stable can be produced.
  • painted sheets according to the invention are characterized in that the surface changes that are induced by deformation and which lead to an impairment of gloss and sharpness of image can be eliminated by the invention following processing steps.
  • the production of a defined surface structure with respect to gloss and waviness at forming degrees ⁇ 2% preferably by heat treatment at temperatures> Tg.
  • the production of the defined surface structure is preferably carried out by a combination of local mechanical processing, in particular polishing and heat treatment.
  • the need for mechanical processing increases with increasing degree of deformation and is additionally dependent on the component geometry.
  • the paint system can consist of a primer layer, a color-giving basecoat and the two final clearcoat films which are applied in the coil coating process.
  • Primer and base coat are modified commercial coil coating paints.
  • the primer has a thickness of 10 to 25 microns and the basecoat applied thereon also has a thickness of 10 to 25 microns.
  • the total paint layer thickness is about 60 to 80 microns and thus differs greatly from conventional automotive coatings, which have a typical thickness of 90 to 130 microns.
  • the layer structure here provides a two-layer clearcoat, while in conventional automotive finishes the clearcoat is single-layered.
  • thermomechanical and mechanical properties of the coating can be adjusted via the chemistry or curing reaction of the two-layer clearcoat.
  • such a varnish may be processed with one or more sanding or polishing steps, the upper topcoat serving as a wear layer.
  • the grinding or polishing step the roughness or waviness of the lacquer is locally changed so that the specified characteristic values - which usually correspond to those on the flat metal sheet - are also achieved in shaped areas
  • a conventional automotive paint has a corrosion protection primer (KTL), an overlying filler, then a single-coat coloring paint and a single-coat clearcoat.
  • KTL corrosion protection primer
  • the thickness is typically 90 to 130 ⁇ m.
  • Such paints are usually applied by dip coating (KTL) and spray painting by painting robots.
  • the paint system according to the invention has a significantly lower layer thickness of 50 to 90 microns compared to conventional paint structures and is usually constructed four-layered.
  • the first layer facing a sheet substrate is a conventional primer with a thickness of 5 to 25 microns, on which a coloring paint is applied with 10 to 25 microns.
  • a two-layer clearcoat is applied in which the first clearcoat layer has a thickness of from 3 to 30 .mu.m and preferably from 5 to 20 .mu.m and the outercoat layer has a thickness of from 5 to 30 .mu.m and preferably from 15 to 25 .mu.m.
  • the two clearcoat films differ in their mechanical properties.
  • thermomechanical properties of the two clearcoats in the crosslinked state are firstly characterized by the Tg values, ie the softening values at temperature. According to the invention, these values are different, wherein the intermediate clearcoat in the crosslinked state has a Tg ⁇ 60 0 C and the cover clearcoat in the crosslinked state has a Tg ⁇ 80 0 C.
  • the two cover clearcoats are adjusted in terms of their ratio of strength and elasticity such that for components with high stress with regard to the foldability (ie a deformation in which the sheet is strongly bent along one edge) a ratio of the tan ⁇ max values ( Deckklarlack to intermediate clearcoat) of ⁇ 0.8.
  • a ratio of the tan ⁇ max values (cover clearcoat to intermediate clearcoat) of ⁇ 0.6 is maintained.
  • Particularly preferred for components with high stress in terms of thermoformability is a ratio of tan ⁇ max values of> 0.9.
  • the outer varnish is designed to be thicker and, in particular, harder as a mechanical processing reserve than the underlying clear varnish.
  • thermo-mechanical properties of the two upper lacquer layers in particular the setting of the Tg values and the adjustment of tan ⁇ max values and optionally providing a polishing reserve, a defined surface structure with respect to the gloss and waviness of the paint after Reshaping takes place by carrying out a heat treatment at temperatures> Tg at degrees of deformation ⁇ 2%.
  • the outer clearcoat is applied at a residual thickness of 10 to 25 microns with a thickness that ensures a corresponding polishing reserve.
  • a method is provided which allows the surface to be conditioned with a special paint system in such a way that, after the forming or, if appropriate, only one heat treatment step, a paint surface is obtained which also in the formed regions high quality requirements for a painted surface are sufficient.
  • the outer clearcoat is applied at a residual thickness of 10 to 25 microns with a thickness that ensures a corresponding polishing reserve.
  • a method which allows the surface to be conditioned with a special paint system in such a way that, after the forming or, if appropriate, only one heat treatment step, a paint surface is obtained which also in the formed regions high quality requirements for a painted surface are sufficient. It is advantageous that a significant cost reduction can be achieved, since the manufacturers can be dispensed with separate Lackierstrassen.
  • the constancy of the coating quality can be improved, as in the coil coating process on flat sheets easier and more accurate control of the painting process is possible as in the spray coating on the finished formed component.
  • all sheet metal parts are uniformly and uniformly covered with varnish. In addition, this also ensures that optimum protection of the steel substrate is achieved in flange areas.

Landscapes

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

Abstract

L'invention concerne un procédé de fabrication de tôles enduites transformables, selon lequel une tôle de métal est recouverte de plusieurs couches de peinture et de vernis, qui comprennent au moins deux couches de vernis superposées externes, la couche de vernis la plus à l'extérieur, à l'état réticulé, présentant un point de ramollissement supérieur à celle du vernis sous-jacent, et les deux couches de vernis de couverture ayant leur rapport de résistance et d'élasticité réglé de manière à respecter, pour des tôles devant présenter une grande aptitude au sertissage, un rapport de valeurs tan δmax ≤ 0,8 entre la couche de vernis de couverture et la couche de vernis intermédiaire et, pour des tôles devant présenter une grande aptitude à l'emboutissage, un rapport de valeurs tan δmax ≥ 0,6 entre la couche de vernis de couverture et la couche de vernis intermédiaire.
PCT/EP2009/001476 2008-04-04 2009-03-02 Procédé de fabrication de tôles enduites transformables et tôles enduites selon ce procédé Ceased WO2009121455A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP09728249.5A EP2257389B1 (fr) 2008-04-04 2009-03-02 Procédé de fabrication de tôles enduites transformables et tôles enduites selon ce procédé

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008017146.8 2008-04-04
DE200810017146 DE102008017146B3 (de) 2008-04-04 2008-04-04 Verfahren zum Herstellen von fertig lackierten umformbaren Blechen und nach dem Verfahren lackiertes Blech

Publications (2)

Publication Number Publication Date
WO2009121455A2 true WO2009121455A2 (fr) 2009-10-08
WO2009121455A3 WO2009121455A3 (fr) 2009-12-17

Family

ID=40490553

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2009/001476 Ceased WO2009121455A2 (fr) 2008-04-04 2009-03-02 Procédé de fabrication de tôles enduites transformables et tôles enduites selon ce procédé

Country Status (3)

Country Link
EP (1) EP2257389B1 (fr)
DE (1) DE102008017146B3 (fr)
WO (1) WO2009121455A2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2221124A3 (fr) * 2009-02-19 2011-03-23 Liebherr-Hausgeräte Lienz GmbH Procédé de fabrication d'une porte, d'un toit ou d'une paroi d'un appareil ménager
CN113290350A (zh) * 2021-05-19 2021-08-24 镇江市俊翔电器有限公司 一种便于连接的金属钣金件加工工艺

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5707697A (en) * 1987-03-27 1998-01-13 Avery Dennison Corporation Dry paint transfer product having high DOI automotive paint coat
JPH01194979A (ja) * 1987-09-25 1989-08-04 Kansai Paint Co Ltd アルミホイールの塗装方法
DE10047982A1 (de) * 2000-09-28 2002-04-25 Basf Coatings Ag Farb- und/oder effektgebende Mehrschichtlackierung mit mindestens zwei übereinander liegenden Klarlackierungen von unterschiedlicher Härte und Flexibilität
DE10059856A1 (de) * 2000-11-30 2002-07-18 Bollig & Kemper Gmbh & Co Kg Klarlackschicht
DE10335491A1 (de) * 2003-08-02 2005-02-24 Basf Coatings Ag Thermisch härtender, transparenter Beschichtungsstoff, Verfahren zu seiner Herstellung und seine Verwendung
JP2005082623A (ja) * 2003-09-04 2005-03-31 Kobe Steel Ltd 深絞り加工後耐食性に優れたノンクロメート系プレコート金属板及びその製法、並びに該プレコート金属板を製造するための塗料組成物
GB2447741B (en) * 2007-03-12 2009-06-17 Kansai Paint Co Ltd Method for making multilayer coating film

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2221124A3 (fr) * 2009-02-19 2011-03-23 Liebherr-Hausgeräte Lienz GmbH Procédé de fabrication d'une porte, d'un toit ou d'une paroi d'un appareil ménager
CN113290350A (zh) * 2021-05-19 2021-08-24 镇江市俊翔电器有限公司 一种便于连接的金属钣金件加工工艺

Also Published As

Publication number Publication date
WO2009121455A3 (fr) 2009-12-17
EP2257389A2 (fr) 2010-12-08
DE102008017146B3 (de) 2009-04-30
EP2257389B1 (fr) 2016-05-18

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