WO1998023390A1 - Procede d'application de peinture en plusieurs couches - Google Patents

Procede d'application de peinture en plusieurs couches Download PDF

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Publication number
WO1998023390A1
WO1998023390A1 PCT/EP1997/006417 EP9706417W WO9823390A1 WO 1998023390 A1 WO1998023390 A1 WO 1998023390A1 EP 9706417 W EP9706417 W EP 9706417W WO 9823390 A1 WO9823390 A1 WO 9823390A1
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WO
WIPO (PCT)
Prior art keywords
layer
coating
basecoat
coating agent
primer
Prior art date
Application number
PCT/EP1997/006417
Other languages
German (de)
English (en)
Inventor
Pamela Fritz
Klausjörg Klein
Ahmed Shafik
Dieter STRANGHÖNER
Original Assignee
Herberts Gesellschaft mit beschränkter Haftung
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 Herberts Gesellschaft mit beschränkter Haftung filed Critical Herberts Gesellschaft mit beschränkter Haftung
Priority to EP97950199A priority Critical patent/EP0952894B1/fr
Priority to DE59706579T priority patent/DE59706579D1/de
Publication of WO1998023390A1 publication Critical patent/WO1998023390A1/fr

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    • 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
    • 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

Definitions

  • the invention relates to a process for the production of multi-layer coatings, which is particularly suitable for the production of multi-layer painted automobile bodies and body parts.
  • the total layer thickness of such automotive coatings is in the usual practice between 90 and 130 ⁇ m, which is the sum of 15 to 25 ⁇ m layer thickness for the primer, 30 to 40 ⁇ m for the filler layer, and 10 to 25 ⁇ m for the
  • EP-A 1-0 448 280 describes a multi-layer coating whose total layer thickness is in the range mentioned above, but this has no clear lacquer layers. It has hitherto been necessary to exceed these layer thicknesses considerably if paintwork with a particularly good visual appearance, ie with an outstanding gloss and topcoat level, is achieved, for example, when painting motor vehicles of the luxury and luxury classes should.
  • DE-A-42 15 070 and DE-A-38 39 905 describe the application of several layers of clear lacquer to one basecoat layer. This then results in layer thicknesses of over 110 ⁇ m, for example up to 170 ⁇ m, which is undesirable on the finished vehicle for reasons of material savings and weight savings.
  • the object of the invention is to provide a method for producing a multi-layer coating, in particular for the production of multi-layer motor vehicle bodies and vehicle body parts which have a reduced overall layer thickness of the multi-layer coating in comparison with the prior art, with a comparable gloss and topcoat level, or which comply with the usual
  • Total layer thicknesses of the multi-layer coating have an outstanding, improved gloss and topcoat level. There should be no disadvantages in the overall property level of the multi-layer coatings.
  • the process is intended to avoid the handling of deep-drawing aids, such as drawing greases or oils, and the subsequent cleaning of them.
  • this object can surprisingly be achieved by a process for the production of multi-layer coatings, in particular multi-layer painted automobile bodies or vehicle body parts, in which a primer layer made of a primer coating agent is applied and baked on both sides of a coil made of sheet metal in the coil coating process , sheet metal parts are then punched out of the coil and deformed in the deep-drawing process and, if appropriate, joined to form an automobile body, whereupon a color and / or effect basecoat layer and one or more clearcoat layers are applied, with the
  • An intermediate layer can be applied to the primer layer and the application of the basecoat layer, and the application of the second coating layer as a basecoat layer or as an intermediate layer is carried out by electrophoretic deposition from an electrophoretically depositable coating agent, the total dry layer thickness of the multilayer coating being 70 to 130 ⁇ m and that
  • the total dry layer thickness of the clear lacquer layer (s) is 30 to 80 ⁇ m.
  • the primer layer " is created from a primer coating agent and in a layer thickness that results in an electrically conductive coating layer in the burned-in state.
  • the immediately following second layer can then be produced can be applied by electrophoretic deposition from an electrophoretically depositable aqueous coating agent, which preferably leads to an electrically insulating second coating layer, and an intermediate layer can be formed and baked as a second coating layer, whereupon, as a third coating layer, a basecoat layer composed of a coloring and / or effect-imparting coating agent is preferred by spraying, which is provided with one or more clear lacquer coating layers.
  • a color and / or effect basecoat is formed from an electrophoretically depositable aqueous coating composition by electrophoretic deposition, which is overcoated with one or more clearcoat layers.
  • the total dry layer thickness of the lacquer structure is 80 to 130 ⁇ m, particularly preferably less than 110 ⁇ m.
  • Coating layers are applied, which is characterized in that the priming coating agent used is one which, in the applied layer thickness and in the baked state, leads to an electrically conductive priming coating layer, whereupon after the baking of the first coating layer, an electrically insulating second coating layer as
  • Intermediate layer is electrophoretically deposited and baked from an electrophoretically separable aqueous coating agent, whereupon as a third coating layer, a basecoat layer of a coloring and / or effect-imparting coating agent, preferably by spraying, is applied and optionally baked directly, which is coated with a fourth, transparent coating layer from a
  • Clear lacquer coating agent is overcoated.
  • Basecoat and the coating layer are preferably baked together from a clear lacquer coating agent, whereupon one or more further transparent coating layers are optionally applied.
  • the total dry layer thickness of the lacquer structure is 70 to 130 ⁇ m, preferably 80 to 130 ⁇ m, particularly preferably less than 110 ⁇ m and that
  • the dry layer thickness of the transparent coating layer or the total layer thickness of the transparent coating layers is 30 to 80 ⁇ m, preferably 40 to 60 ⁇ m.
  • the clear lacquer layer can consist of one or more layers, the first clear lacquer layer preferably being stoved before application of the further clear lacquer layers. If several layers of clear lacquer are applied, they can be created from the same or different clear lacquer coating agents.
  • a second independent and particularly preferred embodiment of the invention consists in a method for producing a multi-layer coating, in particular multi-layer painted automobile bodies or body parts, in which a primer layer made of a primer coating agent is applied and baked on both sides of a coil of sheet metal in the coil coating process the coil Then sheet metal parts are punched out and deformed in the deep-drawing process and, if necessary, joined to form an automobile body, whereupon a color and / or effect basecoat layer is applied from an aqueous coating agent and baked, without application of intermediate layers, and then provided with one or more clear lacquer coatings, which is characterized by this that the primer coating used is one which, in the applied layer thickness and in the baked state, leads to an electrically conductive primer coating layer, the basecoat is formed from an electrophoretically separable aqueous coating composition by electrophoretic deposition, the total dry film thickness of the clearcoat film or
  • Clear lacquer layers is 30 to 80 ⁇ m, preferably 40 to 60 ⁇ m, and the total dry layer thickness of the multi-layer coating is 70 to 130 ⁇ m, preferably 70 to 110 ⁇ m.
  • the clear lacquer layer can consist of one or more layers, the first clear lacquer layer preferably being stoved before application of the further clear lacquer layers. If several layers of clear lacquer are applied, they can be created from the same or different clear lacquer coating agents.
  • Spray filler layers enabled. Even with a high layer thickness when applying the clear lacquer, the total layer thicknesses of the multi-layer lacquers produced by the process according to the invention are comparatively small.
  • Primer coating compositions which can be used for the coating layer are, in particular, liquid coating compositions which can be applied in the coil coating process. It can be an aqueous-based coating agent or an organic solvent-based agent. They can be physically drying. As a rule, they can be cross-linked to form covalent bonds. These can be self- or externally networked systems.
  • the primer coating compositions which can be used in the process according to the invention for the production of the first coating layer contain one or more film-forming binders. In particular, if the binders are not self-crosslinking or physically drying (thermoplastic), they may also contain crosslinking agents.
  • Both the binder component and the crosslinker component are not subject to any restrictions per se; it is possible to use resins which are customary in lacquer and are familiar to the skilled worker.
  • resins which are customary in lacquer and are familiar to the skilled worker.
  • polyester, polyurethane, epoxy and / or polymer resins can be used as film-forming binders.
  • crosslinking agents that may be present depends on the functionality of the binder, i.e. the crosslinkers are selected from conventional crosslinkers known to those skilled in the art so that they have a reactive functionality which is complementary to the functionality of the binders. Examples of such complementary functionalities between binder and crosslinker are:
  • the crosslinking agents optionally used in the primer coating compositions can be present individually or in a mixture.
  • the primer coating compositions applied in the coil coating process contain constituents which impart electrical conductivity and which, in the baked state, impart to the first coating layer a resistivity which is sufficiently low for the electrophoretic deposition of a further coating layer from an electrophoretically depositable coating composition, generally below 10 8 ohms. cm, for example between 10 3 and 10 8 ohm.cm. This also ensures spot weldability of the primer coating layer.
  • electrical conductivity-imparting components are particulate inorganic or organic electrical conductors or semiconductors, as are customary for this purpose and are known to the person skilled in the art, for example iron oxide black, graphite, carbon black, metal powder, for example made of aluminum, zinc, copper or stainless steel, Molybdenum disulfide id.
  • the electrical conductivity imparting components are contained in the primer coating agent in such an amount that the desired resistivity of the primer coating layer is achieved in the baked state. Based on the solids content of the primer coating composition, the proportion of the constituent (s) conferring electrical conductivity is, for example, between 1 and 30% by weight. The proportion can easily be determined by a specialist; it depends, for example, on the specific weight, the specific electrical conductivity and the particle size of the components imparting electrical conductivity. One or more of these components can be present in combination.
  • the primer coating compositions which can be used in the process according to the invention preferably contain pigments and / or fillers.
  • Suitable pigments or fillers are, for example, customary, inorganic or organic pigments and / or fillers. Examples are carbon black, titanium dioxide, iron oxide pigments,
  • Kaolin Kaolin, talc, silicon dioxide and in particular corrosion protection pigments, such as zinc chromate, strontium chromate, lead silicate, zinc phosphate, aluminum phosphate, strontium aluminum polyphosphate hydrate.
  • corrosion protection pigments such as zinc chromate, strontium chromate, lead silicate, zinc phosphate, aluminum phosphate, strontium aluminum polyphosphate hydrate.
  • the primer coating compositions which can be used in the process according to the invention can furthermore contain customary additives.
  • customary paint additives such as wetting agents, dispersing aids, emulsifiers, leveling agents, corrosion inhibitors, anti-foaming agents and in particular lubricants, for example waxes such as polyethylene wax, molybdenum disulfide, graphite.
  • the coating agents which are suitable for the production of primer layers and can be applied in the coil coating process and which do not contain any special or insufficient amounts of constituents which impart electrical conductivity are coating agents which, when adhering to a low dry layer thickness of, for example, 1 to 3 ⁇ m coating layers can be produced which, in the baked state, can be deposited from an electrophoretically to separate a subsequent coating layer Coating agents have sufficient electrical conductivity and spot welding ability.
  • Coating agents that can be applied due to their content of electrical conductivity-imparting components in a higher dry layer thickness of, for example, 2 to 15 ⁇ m, preferably from 3 to 10 ⁇ m, are coating agents from which coating layers can be produced, which, in the baked state, are used for one Deposition of a subsequent coating layer from an electrophoretically depositable coating agent have a sufficiently low specific electrical resistance and which can be spot-welded.
  • the primer coating agent is rolled onto a metal sheet on both sides in the coil coating process. If it is a primer coating agent which does not contain any special electrical conductivity-imparting constituents, it is applied in a sufficiently low dry layer thickness which ensures sufficient electrical conductivity for the electrophoretic deposition of a further coating layer from an electrophoretically separable coating agent, i.e. in a not yet electrical one insulating dry layer thickness of 1 to 3 ⁇ m, for example.
  • the priming coating composition is in a dry layer thickness from, for example, 2 to 15 ⁇ m, preferably from 3 to 10 ⁇ m.
  • the primer coating layer is baked briefly at high temperatures, for example within 30 to 60 seconds, for example in a convection oven at 300 to 370 ° C., maximum object temperatures (PMT, peak metal temperature) between 200 and 260 ° C. being reached.
  • Sheet metal parts with the desired shape are punched out of the metal coil provided on both sides with the burned-in primer layer and then deformed in the deep-drawing process.
  • the deformed parts can be put together to form a construction, in particular a body.
  • suitable joining techniques are gluing and / or clinching and / or screwing and / or welding, for example spot welding. Welding processes are preferred.
  • a second coating layer is applied to the primer layer by electrocoating.
  • This can be an intermediate layer if a base lacquer layer, which is provided with one or more clear lacquer coatings, is subsequently applied as a third coating layer, preferably by spraying.
  • the second coating layer is preferably a base lacquer layer to which one or more clear lacquer coatings are applied.
  • electrophoretically depositable coating agents are used for the intermediate layer or the basecoat layer, which is applied as the second coating layer.
  • the anodically or cathodically depositable electrocoat materials (ETL) known per se are particularly suitable for this purpose.
  • the ETL coating compositions are in particular aqueous coating compositions with a solids content of up to 50% by weight, for example up to 20% by weight, the lower limit being, for example, 10% by weight.
  • the solid is formed from binders customary for electrocoating, at least some of the binders bearing ionic and / or substituents which can be converted into ionic groups and, if appropriate, groups capable of chemical crosslinking, and any crosslinking agents, fillers, pigments or additives customary in lacquers.
  • Binders can be anionic groups or groups which can be converted into anionic groups, acidic groups such as -COOH, -SO 3 H and / or -PO 3 H 2 and the corresponding anionic groups neutralized with bases. They can also be cationic or convertible into cationic groups, for example basic groups, preferably nitrogen-containing basic groups; these groups can be present in quaternized form or they are converted into ionic groups using a conventional neutralizing agent, for example an organic monocarboxylic acid, such as, for example, formic acid or acetic acid. Examples are amino, ammonium, for example quaternary ammonium, phosphonium and / or sulf onium groups.
  • the usual cathodic electrocoat materials (KTL) based on canonical or basic binders can be used to produce the second coating layer.
  • Such basic resins are, for example, primary, secondary and / or tertiary amino group-containing resins, the amine numbers of which are e.g. are 20 to 250 mg KOH / g.
  • the weight average molar mass (Mw) of the base resins is preferably 300 to 10,000.
  • base resins are amino (meth) acrylate resins, aminoepoxy resins, aminoepoxy resins with terminal double bonds, aminoepoxide resins with primary OH groups, aminopolyurethane resins, amino group-containing polybutadiene resins or modified polybutadiene resins or amino group-containing polybutadiene resins -
  • Amine reaction products These base resins can be self-crosslinking or they are used in a mixture with known crosslinking agents.
  • crosslinkers are aminoplast resins, blocked polyisocyanates, crosslinkers with terminal double bonds, polyepoxide compounds or crosslinkers which contain groups capable of transesterification.
  • anionic group-containing anodically depositable electrocoat binders and paints can also be used in the process according to the invention to produce the second coating layer.
  • (Meth) acrylic copolymer resins maleate oils or polybutadiene oils with a weight average molecular weight (Mw) of, for example, 300 to 10,000 and one Acid number from 35 to 300 " mg KOH / g.
  • the binders carry -COOH, -SO 3 H and / or -PO 3 H 2 groups. After neutralization of at least some of the acid groups, the resins can be converted into the water phase.
  • the binders can be self-crosslinking or externally crosslinking, and the lacquers can therefore also contain customary crosslinking agents, for example triazine resins, crosslinking agents which are capable of transesterification
  • Groups contain or blocked polyisocyanates.
  • an ATL coating agent as the ETL coating agent, in particular when implementing the particularly preferred and independent embodiment of the present invention, in which the coloring and / or effect-imparting basecoat is deposited electrophoretically as a second coating layer.
  • the ETL coating compositions can contain pigments, fillers and / or additives customary in lacquers.
  • Suitable pigments are, for example, the customary inorganic and / or organic colored pigments and / or effect pigments and / or fillers.
  • the usual inorganic and / or organic colored pigments and / or effect pigments such as e.g. Titanium dioxide, iron oxide pigments, carbon black, phthalocyanine pigments, quinacridone pigments, metal pigments, e.g. made of titanium,
  • interference pigments e.g. titanium dioxide-coated aluminum, coated mica, graphite effect pigments, platelet-shaped iron oxide or platelet-shaped copper phthalocyanine pigments.
  • fillers are kaolin, talc or silicon dioxide.
  • the pigments can be dispersed into pigment pastes, e.g. using known paste resins.
  • pigment pastes such as those used in the water-based lacquers which can be applied by spraying and are suitable for the production of two-layer lacquers of the basecoat / clearcoat type known to those skilled in the art.
  • Pigment pastes can be obtained by rubbing the pigments in a special water-thinnable paste resin. ⁇
  • additives as are known in particular for ETL coating agents, are possible as additives.
  • these are wetting agents, neutralizing agents, leveling agents, catalysts, corrosion inhibitors, anti-foaming agents, solvents, but especially light stabilizers, if appropriate in combination with
  • Basecoat coating compositions are used, such as are used for the production of basecoat / clearcoat two-coat coatings and are known in large numbers, for example, from the patent literature.
  • the basecoats which can be used to produce the third coating layer in the process according to the invention can be physically drying or can be crosslinked to form covalent bonds.
  • the basecoats which crosslink with the formation of covalent bonds can be self- or externally crosslinking systems.
  • the color and / or effect basecoats which can be used in the process according to the invention for producing the third coating layer are preferably liquid coating compositions. It can be a one- or multi-component coating agent, single-component are preferred. It can be systems based on organic solvents or it is preferably water-based paints, the binder systems of which are suitable, e.g. are anionically, cationically or nonionically stabilized.
  • the basecoat materials which can be used in the process according to the invention for the production of the third coating layer are customary
  • Coating systems that contain one or more common base resins as film-forming binders. You can, if the base resins are not self-crosslinking or self-drying are, if appropriate, also contain crosslinkers. Both the base resin component and the crosslinker component are not subject to any limitation. Polyester, polyurethane and / or (meth) acrylic copolymer resins, for example, can be used as film-forming binders. In the case of the preferred waterborne basecoats, polyurethane resins are preferably present, particularly preferably at least in a proportion of 15% by weight, based on the solid resin content of the waterborne basecoat.
  • the selection of the crosslinking agents which may be present is not critical, it depends on the functionality of the base resins, ie the crosslinking agents are selected such that they have a reactive functionality which is complementary to the functionality of the base resins. Examples of such complementary
  • base resin and crosslinker are: hydroxyl / methylol ether, hydroxyl / free isocyanate, hydroxyl / blocked isocyanate, carboxyl / epoxy. If compatible with one another, several such complementary functionalities can also be present side by side in a basecoat.
  • the crosslinking agents optionally used in the basecoats can be present individually or in a mixture.
  • the basecoats used in the process according to the invention for the production of the third coating layer contain inorganic and / or organic colored pigments and / or effect pigments, e.g. Titanium dioxide,
  • metal pigments e.g. made of titanium, aluminum or copper
  • interference pigments e.g. titanium dioxide coated aluminum, coated mica, graphite effect pigments, platelet-shaped iron oxide or platelet-shaped copper phthalocyanine pigments.
  • the basecoats used for the production of the third coating layer can contain conventional paint additives, such as e.g. Fillers, catalysts, leveling agents, anti-cratering agents or in particular light stabilizers, if appropriate in combination with antioxidants.
  • conventional paint additives such as e.g. Fillers, catalysts, leveling agents, anti-cratering agents or in particular light stabilizers, if appropriate in combination with antioxidants.
  • the coloring and / or applied preferably as a third coating layer by spraying effect-imparting basecoat can be applied as a two-layer basecoat system consisting of a first, modified basecoat and a second basecoat that determines the actual color of the multi-layer coating.
  • the first basecoat is modified, for example by containing additional modifying binder components or filler components. It can be produced, for example, from the subsequently applied basecoat, which determines the actual color, by mixing it with the additional components.
  • the electrodeposition lacquer used to produce the second coating layer which is the intermediate layer, has a color tone that is close to or identical to that of the basecoat used to produce the third coating layer.
  • color shades that come close to one another are preferably to be understood to mean that those composed of brightness difference, hue difference and hue difference
  • n _ ⁇ _ 90 in the area of the CIE-x
  • y diagram marked with ⁇ E * 0.3, n ⁇ _ 50 in the area of the CIE-x
  • y diagram marked with ⁇ E * 0.5, n _ ⁇ _ 40 in the area of the CIE-x
  • y-diagram marked with ⁇ E * 0.7, n _ ⁇ . 30 in the area of the CIE x
  • y diagram marked ⁇ E * 0.9.
  • clearcoat coating agents for the production of the fourth and possibly further coating layers or, in the case of the particularly preferred and independent embodiment of the present invention, for the production of the third and optionally further coating layers.
  • there it can be a one- or multi-component clear lacquer coating agent.
  • They can be solvent-free (liquid or as a powder clearcoat), or they can be systems based on solvents, or they can be water-thinnable clearcoats, the binder systems of which are stabilized in a suitable manner, for example anionically, cationically or non-ionically.
  • the water-dilutable clear lacquer systems can be water-soluble or water-dispersed systems, for example emulsion systems or powder slurry systems.
  • the clear lacquer coating agents harden when stoved to form covalent bonds as a result of chemical crosslinking.
  • the clearcoats which can be used in the process according to the invention are customary clearcoat coating compositions which contain one or more customary base resins as film-forming binders. If the base resins are not self-crosslinking, they may also contain crosslinking agents. Neither the base resin component nor the crosslinker component are subject to anything
  • Polyester, polyurethane and / or (meth) acrylic copolymer resins for example, can be used as film-forming binders (base resins).
  • crosslinking agents that may be present is not critical; it depends on the functionality of the base resins, i.e. the crosslinkers are selected so that they have a reactive functionality which is complementary to the functionality of the base resins.
  • Examples of such complementary functionalities between base resin and crosslinker are: carboxyl / epoxide, hydroxyl / methylol ether, hydroxyl / free isocyanate, hydroxyl / blocked isocyanate, (meth) acrylolyl / CH-acidic group. If compatible with one another, several such complementary ones can also be used
  • crosslinking agents optionally used in the clear lacquers can be present individually or in a mixture.
  • the clear lacquers which can be used in the process according to the invention can be customary lacquers
  • the transparent coating can be in a single layer or in the form of several layers of the same or of several different transparent ones
  • the transparent coating layer is expediently applied as a fourth layer or, in the case of the particularly preferred and independent embodiment of the present invention, as a third layer composed of only one clear lacquer coating agent.
  • Clearcoat compositions which have the lowest possible drainage tendency are preferably used, for example solid-state clearcoats with a correspondingly adjusted theological behavior. Pul clear lacquers are particularly preferred.
  • Metal sheets rolled up into coils are used as substrates for the process according to the invention, for example with a sheet thickness of 0.7 to 1.3 mm typical for body construction, for example made of iron, zinc, aluminum or corresponding alloys.
  • Galvanized sheet metal for example galvanized steel sheet, is preferred.
  • the metal surfaces can be pretreated, for example provided with phosphating and optionally passivation. The metal surfaces can be used for shaping under the usual in automotive engineering according to the prior art
  • the first coating layer namely the primer
  • the first coating layer is applied to these substrates, preferably rolled on both sides, from the primer coating agent in the coil coating process.
  • the primer coating agent does not contain any components that impart electrical conductivity, it is applied in a dry layer thickness, which is one for electrophoretic deposition additional coating layer made of an electrophoretically depositable coating agent ensures sufficient electrical conductivity, for example in a dry layer thickness of 1 to 3 ⁇ m. If, on the other hand, it is one of the primer coating compositions preferred in the process according to the invention, which in the baked state of the first coating layer is one for electrophoretic
  • the primer coating agent is applied in a dry layer thickness of, for example, 2 to 15 ⁇ m, preferably 3 to 10 ⁇ m. Branding the
  • the primer coating layer is applied briefly at high temperatures, for example within 30 to 60 seconds, for example in a convection oven at 300 to 370 ° C., maximum object temperatures (PMT, peak metal temperature) between 200 and 260 ° C. being reached.
  • PMT maximum object temperatures
  • Sheet metal parts with the desired shape are now punched out of the metal coil provided on both sides with the burned-in primer layer and then deformed in the deep-drawing process.
  • the deformed parts can then, if appropriate together with components made of other materials, be joined to form a structure, in particular a body, for example by gluing and / or clinching and / or screwing and / or preferably welding.
  • the components made from other materials can be, for example, otherwise precoated or uncoated metals or plastics, components with an electrically conductive and electrophoretically coatable surface are preferred.
  • the second coating layer is applied from an electrophoretically depositable coating agent and baked in particular at elevated temperatures, for example between 130 and 180 ° C. If the second coating layer from the electrophoretically depositable coating agent applied as an intermediate layer, this is preferably done in dry layer thicknesses of, for example, 5 to 40 ⁇ m, particularly preferably from 10 to 30 ⁇ m, while the application as a color and / or effect-imparting basecoat layer is preferably in a dry layer thickness of 10 to 50 ⁇ m, for example, is carried out particularly preferably from 15 to 40 ⁇ m.
  • the second coating layer generally has practically no electrical conductivity, ie it has a specific resistance of generally more than 10 9 ohms in the baked state. cm on. In the case of the particularly preferred and independent embodiment of the present invention, it is a color and / or effect basecoat.
  • the coating obtained by electrodeposition coating and which is electrically insulating in the baked state can, but does not have to extend over the entire surface of the three-dimensional substrate.
  • Ausrahrungsform of the present invention in which the coloring and / or effect basecoat layer is applied from an electrophoretically depositable coating agent) a full-surface first coating by applying a primer from the primer coating agent and a second coating from the ETL coating agent essentially only on outer areas, to be carried out in particular on visible surfaces of a three-dimensional substrate, ie for example, not in narrow cavities in a body.
  • the third coating layer for example from a coloring and / or effect-imparting basecoat or, in the case of the particularly preferred and independent embodiment of the present invention, from a clearcoat coating composition.
  • a spray application of the third coating layer from the color and / or effect basecoat is carried out, for example, in a dry layer thickness of 10 to 25 ⁇ m, depending on the color, for example by compressed air spraying, airless spraying or ESTA high-speed rotary spraying.
  • the clearcoat is applied, preferably in the wet-on-wet process.
  • the fourth coating layer is made from a conventional liquid lacquer or powder clear lacquer
  • Coating layer or the total layer thickness of the transparent coating layers is 30 to 80 ⁇ m, preferably 40 to 60 ⁇ m.
  • the clear lacquer is applied to the second, preferably burned-in, coloring and / or effect-giving ETL coating layer.
  • a customary liquid clear lacquer or a powder clear lacquer is applied as the clear lacquer coating layer and baked, for example, at temperatures of 80 to 160 ° C. If necessary, further layers of clear lacquer from the same or different clear lacquer coating compositions can be applied.
  • the process according to the invention is such that the layer thickness of the transparent coating layer or the total layer thickness of a plurality of transparent coating layers is 30 to 80 ⁇ m, particularly preferably 40 to 60 ⁇ m.
  • That applied as a third coating layer preferably by spray application
  • Basecoat and preferably by spray application as the fourth or in the case of the particularly preferred and independent embodiment of the invention as the third Coating layer applied clear coat can, but does not have to extend all over the three-dimensional substrate.
  • Variant (8) represents the cheapest variant of variants (1) - (8).
  • the statements made above apply with regard to the electrocoat, basecoat and clearcoat layers.
  • the substrates provided with a multi-layer coating by the process according to the invention are preferably automobile bodies or parts thereof. However, it can also be other industrial goods such as Household appliance housings, facade parts, automotive parts.
  • the motor vehicle parts or bodies produced by the method according to the invention have multilayer coatings with an overall property level that is comparable to that of the prior art.
  • the method according to the invention makes it possible to avoid the use of separate deep-drawing aids and to clean them when shaping the sheet metal parts.

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  • Chemical Kinetics & Catalysis (AREA)
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  • Laminated Bodies (AREA)

Abstract

L'invention concerne un procédé permettant d'obtenir une induction multicouche, selon lequel: une couche de fond constituée d'un agent de recouvrement est appliquée sur les deux côtés d'une bande de tôle métallique, selon le procédé d'enduction en continu de bandes, et soumise à une cuisson; des pièces de tôle sont ensuite découpées à la presse dans la bande continue et soumises à un procédé d'emboutissage profond, plusieurs de ces pièces de tôle étant éventuellement assemblées pour former un ensemble; et enfin on applique sur lesdites pièces de tôle, une couche de peinture de base, constituée d'un agent de recouvrement, colorante et/ou à effet, sur laquelle on applique une ou plusieurs couches de vernis.
PCT/EP1997/006417 1996-11-23 1997-11-18 Procede d'application de peinture en plusieurs couches WO1998023390A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP97950199A EP0952894B1 (fr) 1996-11-23 1997-11-18 Procede d'application de peinture en plusieurs couches
DE59706579T DE59706579D1 (de) 1996-11-23 1997-11-18 Verfahren zur mehrschichtlackierung

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19648517.7 1996-11-23
DE19648517A DE19648517A1 (de) 1996-11-23 1996-11-23 Verfahren zur Mehrschichtlackierung

Publications (1)

Publication Number Publication Date
WO1998023390A1 true WO1998023390A1 (fr) 1998-06-04

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1997/006417 WO1998023390A1 (fr) 1996-11-23 1997-11-18 Procede d'application de peinture en plusieurs couches

Country Status (4)

Country Link
EP (1) EP0952894B1 (fr)
DE (2) DE19648517A1 (fr)
ES (1) ES2174317T3 (fr)
WO (1) WO1998023390A1 (fr)

Cited By (2)

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EP1595978A2 (fr) * 2004-05-10 2005-11-16 E.I. du Pont de Nemours and Company Procédé pour la production de substrats revêtus d'une couche
WO2017088988A1 (fr) * 2015-11-26 2017-06-01 Basf Coatings Gmbh Procédé de production d'une peinture multicouche

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DE10028705B4 (de) * 2000-06-09 2004-04-08 Audi Ag Verfahren zur Herstellung eines mit mindestens zwei unterschiedlichen Lacken beschichteten Karosserieelementes eines Kraftfahrzeugs
DE102006005898B4 (de) * 2006-02-09 2008-04-30 Multicolor Deutschland Gmbh Verfahren zur Herstellung von Farbmustern
DE102006016477A1 (de) * 2006-04-07 2007-10-11 GM Global Technology Operations, Inc., Detroit Kataphoretische Tauchlackierungen an Karosserien und Bauteilen mit verbessertem Umgriffverhalten
DE102006036269A1 (de) * 2006-08-03 2008-02-07 Volkswagen Ag Verfahren zur Herstellung einer farbigen Beschichtung von zumindest teilweise aus Metall bestehenden Komponenten von Kraftfahrzeugen
DE102007044572B4 (de) 2007-09-10 2020-01-16 Volkswagen Ag Betriebsmittel zur qualitätsgerechten Lackierung einer Frontklappe von Kraftfahrzeugen

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EP0568967A2 (fr) * 1992-05-07 1993-11-10 Herberts Gesellschaft mit beschränkter Haftung Procédé pour la préparation d'enduits de laque à plusieurs couches
DE19519665C1 (de) * 1995-05-30 1996-09-05 Herberts Gmbh Verfahren zur Mehrschichtlackierung
WO1996038234A1 (fr) * 1995-05-30 1996-12-05 Herberts Gesellschaft mit beschränkter Haftung Procede de peinture multicouche
DE19633173C1 (de) * 1996-08-17 1997-10-02 Herberts Gmbh Verfahren zur Mehrschichtlackierung

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JP2614468B2 (ja) * 1987-11-26 1997-05-28 関西ペイント株式会社 上塗り塗装仕上げ方法
KR900701882A (ko) * 1988-05-20 1990-12-04 헬렌 에이. 파블릭크 열경화성 연신성 코팅 조성물
JPH03264692A (ja) * 1990-03-14 1991-11-25 Shinto Paint Co Ltd 被覆金属板の塗装方法
DE19512017C1 (de) * 1995-03-31 1996-07-18 Herberts Gmbh Verfahren zur Mehrschichtlackierung

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Publication number Priority date Publication date Assignee Title
EP0568967A2 (fr) * 1992-05-07 1993-11-10 Herberts Gesellschaft mit beschränkter Haftung Procédé pour la préparation d'enduits de laque à plusieurs couches
DE19519665C1 (de) * 1995-05-30 1996-09-05 Herberts Gmbh Verfahren zur Mehrschichtlackierung
WO1996038234A1 (fr) * 1995-05-30 1996-12-05 Herberts Gesellschaft mit beschränkter Haftung Procede de peinture multicouche
DE19633173C1 (de) * 1996-08-17 1997-10-02 Herberts Gmbh Verfahren zur Mehrschichtlackierung
WO1998007527A1 (fr) * 1996-08-17 1998-02-26 Herberts Gesellschaft mit beschränkter Haftung Procede de laquage multicouche

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1595978A2 (fr) * 2004-05-10 2005-11-16 E.I. du Pont de Nemours and Company Procédé pour la production de substrats revêtus d'une couche
EP1595978A3 (fr) * 2004-05-10 2007-01-24 E.I. du Pont de Nemours and Company Procédé pour la production de substrats revêtus d'une couche
US7399397B2 (en) 2004-05-10 2008-07-15 E.I. Du Pont De Nemours And Company Process for the production of coated substrates
WO2017088988A1 (fr) * 2015-11-26 2017-06-01 Basf Coatings Gmbh Procédé de production d'une peinture multicouche
RU2700867C1 (ru) * 2015-11-26 2019-09-23 БАСФ Коатингс ГмбХ Способ получения многослойной красочной системы
US10920100B2 (en) 2015-11-26 2021-02-16 Basf Coatings Gmbh Method for producing a multi-layered coating

Also Published As

Publication number Publication date
EP0952894B1 (fr) 2002-03-06
ES2174317T3 (es) 2002-11-01
DE19648517A1 (de) 1998-06-04
EP0952894A1 (fr) 1999-11-03
DE59706579D1 (de) 2002-04-11

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