EP0881954A1 - Procede pour l'application de peinture en plusieurs couches - Google Patents

Procede pour l'application de peinture en plusieurs couches

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Publication number
EP0881954A1
EP0881954A1 EP97903326A EP97903326A EP0881954A1 EP 0881954 A1 EP0881954 A1 EP 0881954A1 EP 97903326 A EP97903326 A EP 97903326A EP 97903326 A EP97903326 A EP 97903326A EP 0881954 A1 EP0881954 A1 EP 0881954A1
Authority
EP
European Patent Office
Prior art keywords
basecoat
coating
layer
aqueous
resins
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.)
Granted
Application number
EP97903326A
Other languages
German (de)
English (en)
Other versions
EP0881954B1 (fr
Inventor
Detlef Schlaak
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.)
EIDP Inc
Original Assignee
Herberts GmbH
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Filing date
Publication date
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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
    • B05D7/56—Three layers or more
    • B05D7/57—Three layers or more the last layer being a clear coat
    • B05D7/577—Three layers or more the last layer being a clear coat some layers being coated "wet-on-wet", the others not

Definitions

  • the invention relates to a method for producing a multilayer coating, in particular metallic substrates, which is particularly suitable for automotive coating.
  • Basecoat / clearcoat topcoat that is applied to an electrophoretically primed body with a filler layer.
  • Basecoat and clearcoat are preferably applied wet-on-wet, i.e. after a flash-off time, if necessary with heating, and after subsequent application of a clear coat, the basecoat is baked together with the latter.
  • EP-A-0238 037 has disclosed a method for reducing stoving layers, in which a filler and an aqueous metallic basecoat are applied by the wet-on-wet method.
  • the example section shows that the filler layer is applied in a dry film thickness of 35 ⁇ m that is customary for filler coatings.
  • the object of the invention is to provide a method for producing multi-layer coatings, in particular automotive coatings compared to the prior art to provide a comparable overall level of properties, but a reduced layer thickness of the overall paint structure, which can be carried out with as few baking steps as possible.
  • the object is achieved by the method for multi-layer coating of a substrate provided with a baked first electrocoat layer, which is characterized in that on this first electrocoat layer a second coating layer corresponding to a dry layer thickness of 10 to less than 30 microns from a first aqueous , color and / or effect basecoat coating composition containing one or more polyurethane resins is applied, whereupon wet-on-wet a third coating layer corresponding to a dry layer thickness of 7 to 15 microns is applied from a second aqueous, color and / or effect basecoat coating composition and a fourth coating layer of a clear lacquer coating agent is applied to the third coating layer without prior baking and the second, third and fourth coating layers are baked together, a first aqueous basecoat is used berzugsstoff that a higher content of
  • Polyurethane resin has as the second basecoat based on the total weight of the respective aqueous basecoat, and the solid resin content in the first basecoat does not deviate by more than 20% from the absolute value of the weight content of solid resin in the second basecoat.
  • the process according to the invention makes it possible to apply an aqueous basecoat coating composition directly to a baked-on first coating layer created by electrodeposition, and this layer together with the subsequently applied second coating layer
  • ETL electrophoretically depositable coating agent for producing the first coating layer, namely a primer become.
  • aqueous coating compositions with a solids content of up to 50% by weight, for example 10 to 20% by weight.
  • the solid is formed from binders customary for electrocoating which carry ionic groups or groups which can be converted into ionic groups and, if appropriate, groups capable of chemical crosslinking, and any crosslinking agents which are present.
  • the ionic or convertible groups can be anionic or convertible groups, e.g. acidic groups such as COOH groups or cationic or convertible groups, e.g. basic groups such as amino, ammonium, e.g. quaternaries
  • Ammonium groups phosphonium and / or sulfonium groups. Binders with basic groups are preferred. Nitrogen-containing basic groups are particularly preferred. These groups can be quaternized or they are at least partially treated with a common neutralizing agent, an acid, e.g. an organic monocarboxylic acid, e.g. Formic acid or acetic acid, converted into ionic groups.
  • a common neutralizing agent an acid, e.g. an organic monocarboxylic acid, e.g. Formic acid or acetic acid, converted into ionic groups.
  • the electrodeposition coating layer it is possible, for example, to use the usual anodically depositable electrodeposition coating binders and lacquers (ATL) containing anionic groups.
  • binders based on polyesters, epoxy resins, poly (meth) acrylates, maleate oils or polybutadiene oils with a weight average molecular weight of, for example, 300 to 10,000 and an acid number of 35 to 300 mg KOH / g.
  • the binders carry, for example, -COOH, -S0 3 H and / or -P0 3 H 2 groups. After neutralization of at least some of the acidic groups, the resins can be converted into the water phase.
  • the binders can be self-crosslinking or externally crosslinking.
  • the lacquers can therefore also contain customary crosslinking agents, for example
  • Triazine resins crosslinking agents containing groups capable of transesterification or blocked polyisocyanates.
  • Anodically depositable electrodeposition paint binders and paints (ATL) containing anionic groups which can be used according to the invention are described, for example, in DE-A-2824418.
  • cathodically depositable electrocoat materials based on cationic or basic binders are preferably used to produce the first coating layer.
  • Such basic resins are, for example, resins containing primary, secondary or tertiary amino groups, 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 examples include 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. This is, 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. This
  • 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.
  • Specific examples of base resins and crosslinking agents which can be used in cathodic dip coating baths are e.g.
  • EP-A-0082 291 EP-A-0234 395, EP-A-0 227 975, EP-A-0 178531, EP-A-0333327, EP-A-0310971, EP-A-0456 270, US 3922 253, EP-A-0 261 385, EP-A-0 245786, DE-A-3324211, EP-A-0414 199, EP-A-0476514.
  • Non-yellowing CTL systems are preferably used, which prevent yellowing or discoloration of the multi-layer coating when baked.
  • KTL systems that crosslink using specially selected blocked polyisocyanates, as described, for example, in EP-A-0265 363.
  • the electrocoat material (ETL) coating agent can contain pigments, fillers and / or additives customary in coating.
  • the pigments can be dispersed into pigment pastes, e.g. using known paste resins. Resins of this type are familiar to the person skilled in the art. Examples of paste resins that can be used in KTL baths are described in EP-A-0 183 025 and in EP-A-0469497.
  • 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, antifoams, solvents, but in particular light stabilizers, if appropriate in combination with antioxidants.
  • the usual aqueous, color and / or effect basecoat coating compositions familiar to the person skilled in the art are used for the production of the second and third coating layers, as are used for the production of basecoat / clearcoat two-coat coatings and described in large numbers, for example, in the patent literature become.
  • the waterborne basecoats can be physically drying or can be crosslinked to form covalent bonds.
  • water-based lacquers that crosslink covalent bonds can be self- or externally crosslinking systems. It can be one- or two-component systems, one-component systems are preferred.
  • the waterborne basecoats which can be used in the process according to the invention contain water-dilutable binders. These contain non-ionic and / or ionic groups which impart hydrophilicity to ensure their water dilutability.
  • Suitable non-ionically stabilized binders are those binders whose water-dilutability is achieved by incorporating polyether segments into the resin molecule.
  • Specific Examples of such stabilized polyurethane or polyurethane acrylate resins are described, for example, in EP-A-0354261, EP-A-0422 357 and EP-A-0424705.
  • the water-dilutable, ionic group-containing binders can be cationic or anionic group-containing binders.
  • cationically stabilized binders which can be used according to the invention are completely or partially neutralized cationic (meth) acrylic copolymer, polyester,
  • Number average molecular weight (Mn) from 500 to 500000, an OH number from 0 to 450, an amine number from 20 to 200 and a glass transition temperature from -50 to + 150 ° C.
  • Mn Number average molecular weight
  • Specific examples of these binders known to the person skilled in the art are described in DE-A-40 11 633.
  • the waterborne basecoats preferably contain binders which are stabilized via anionic groups. These are one or more film-forming resins as are customary in aqueous coating compositions, in particular in aqueous basecoats.
  • the film-forming resins can be, for example, polyester, (meth) acrylic copolymer or preferably polyurethane resins. They can be self-curing, cross-linking or physically drying. Specific examples of suitable water-dilutable (meth) acrylic copolymers are e.g. in EP-A-0399427 and EP-A-0287 144.
  • suitable water-dilutable polyester resins are e.g. in DE-A-29 26854, DE-A-3832 142 and EP-A-0301 300.
  • binders are those in which (meth) acrylic copolymer and polycondensation resin are present covalently or in the form of interpenetrating resin molecules. Examples of such
  • the combination is (meth) acrylic copolymer and polyester resin. Specific examples of such a usable combination are, for example in EP-A-0226 171.
  • Anionically stabilized polyurethane resins are particularly preferably used.
  • Such polyurethane resins are known to the person skilled in the art and are described in great variety in the literature. These are aqueous polyurethane dispersions or solutions or binders in which (meth) acrylic copolymer and polyurethane resin are present in a covalent manner or in the form of interpenetrating resin molecules. Examples of suitable polyurethane dispersions are stable, aqueous dispersions with a solids content of 20 to 50% by weight.
  • Weight average molecular weight (Mw) of the resins can vary widely, e.g. from 1000 to 500000.
  • the polyurethane resins can contain functional groups such as e.g. Contain hydroxyl groups or blocked isocyanate groups.
  • usable polyurethane dispersions are those which can be prepared by chain extension of isocyanate-functional prepolymers with polyamine and / or polyol. They are described for example in EP-A-0089497, EP-A-0228003, DE-A-3628 124 and EP-A-0512 524.
  • polyurethane dispersions which can be prepared by chain-extending isocyanate-functional prepolymers with water, such as e.g. described in DE-A-39 15459 and DE-A-4224617.
  • Polyurethane dispersions can also be used which are produced by chain extension of polyurethane prepolymers containing polyisocyanates reactive with active hydrogen and containing polyisocyanates, such as e.g. in DE-A-3903804 and DE-A-4001 841.
  • anionically stabilized polyurethane (PU) dispersions which can be used are those which can be obtained by chain-extending polyurethane resins containing at least one CH-acidic group in the molecule with compounds which can react with at least two CH-acidic groups. These are special examples polyurethane resin dispersions described in DE-A-42 28510.
  • PU dispersions based on polyurethane resins that are chain-extended via siloxane bridges can also be used. Such are e.g. known from DE-A-44 13 562.
  • anionically stabilized polyurethane-based binders in which (meth) acrylic copolymer and polyurethane resin are present covalently or in the form of interpenetrating resin molecules are e.g. in EP-A-0 353797, EP-A-0297 576, DE-A-41 22265, DE-A-41 22 266 and WO 95/16004.
  • the waterborne basecoats can contain a single aqueous binder, but several aqueous binders can also be present in combination.
  • Aqueous binders based on anionically stabilized polyurethanes are preferably present. It may be appropriate if a part, e.g. up to 50 wt .-%, the polyurethane binder is replaced by resins based on a combination of (meth) acrylic copolymer and polyester resin.
  • Water-dilutable binders based on cellulose may also be present.
  • the customary crosslinkers known to those skilled in the art such as, for example, formaldehyde condensation resins, such as phenol-formaldehyde condensation resins and amine-formaldehyde condensation resins, and free or blocked polyisocyanates can be used.
  • the crosslinkers can be used individually or in a mixture.
  • the mixing ratio of crosslinker to binder resin is preferably 10:90 to 40:60, particularly preferably 20:80 to 30:70, in each case based on the solids weight.
  • the waterborne basecoats used in the process according to the invention contain pigments.
  • Pigments include inorganic and / or organic colored pigments and / or effect pigments and any fillers present. All common pigments can be used; Examples are titanium dioxide, iron oxide pigments, carbon black, azo pigments, phthalocyanine pigments, metal pigments, for example made of titanium, aluminum or copper, interference pigments, such as, for example, titanium dioxide-coated aluminum, coated mica, graphite effect pigments, platelet-shaped iron oxide, platelet-shaped copper phthalocyanine pigments, calcium oxide, barium sulfate, barium sulfate.
  • first and the second basecoat coating compositions differ in their pigment / volume concentration (PVC) by no more than 30% of the absolute value of the pigment / volume concentration in the second basecoat coating composition.
  • PVC pigment / volume concentration
  • the pigment / volume concentration of the first basecoat coating composition is preferably below that of the second
  • the pigment / volume concentration in a coating agent represents the ratio of pigment volume to pigment volume + binder volume and is calculated using the following equation:
  • pigments are preferably used in both basecoat coating compositions, particularly preferably the same pigmentations.
  • Pigmentation is understood to mean the relative composition of a pigment mixture, i.e. H. the type of pigments and their respective proportions in the pigment mixture. It is also preferred to use pigmentations with a similar average specific weight in the two basecoat coating compositions (this results from the relative proportions of the individual pigments).
  • the average specifics preferably differ
  • the coloring absorption pigments (colored pigments) and optionally fillers are generally rubbed into part of the water-dilutable binders. The rubbing can preferably also take place in a special water-thinnable paste resin.
  • the paste resins known to the person skilled in the art and suitable for aqueous systems can be used.
  • a specific example of a paste resin which can preferably be used and which is based on an anionically stabilized polyurethane resin can be found in DE-A-4000889.
  • the grinding is done in conventional units known to those skilled in the art.
  • paste resins are present in the waterborne basecoat, they add up to binders plus any crosslinker present. Both binders, crosslinkers and paste resins together result in the solid resin content of the waterborne basecoats.
  • the waterborne basecoats may also contain customary auxiliaries, e.g. Catalysts, leveling agents, anti-foaming agents, anti-cratering agents or in particular light stabilizers, if appropriate in combination with antioxidants.
  • customary auxiliaries e.g. Catalysts, leveling agents, anti-foaming agents, anti-cratering agents or in particular light stabilizers, if appropriate in combination with antioxidants.
  • the waterborne basecoats for example, have a solids content of 10 to 50% by weight, for effect basecoats it is preferably 15-30% by weight, for plain-colored basecoats it is preferably higher, for example 20-45% by weight.
  • the ratio of pigment to binder plus optionally crosslinking agent plus optionally paste resin in the waterborne basecoat is, for example, between 0.03: 1 to 3: 1, for effect basecoats, for example, it is preferably 0.06: 1 to 0.6: 1, for monochrome
  • Basecoats are preferably higher, for example 0.06: 1 to 2.5: 1, in each case based on the solids weight.
  • the first water-based lacquer used to produce the second coating layer preferably has a lower pigment / binder ratio than the second used to produce the third coating layer
  • binder includes the binder or binders as such plus any crosslinking agent plus any paste resins present, the sum of these components representing the solid resin content of the water-based paints.
  • the first water-based lacquer used to produce the second coating layer is distinguished from the second water-based lacquer used to produce the third coating layer by a higher proportion by weight of polyurethane resins.
  • the absolute value of this excess of polyurethane resins in the first waterborne basecoat preferably corresponds to between 5 and 50%, particularly preferably between 10 and 35% of the absolute value of the weight content of solid resin in the second coating agent.
  • the preferred absolute value for the polyurethane content in the first basecoat coating agent is calculated as the sum of the polyurethane content X (% by weight) of the second coating agent plus 5 to 50% of 20 % By weight, ie the polyurethane content of the first coating agent is then preferred: X + (1 to 10)% by weight.
  • the absolute value of the weight content of solid resin in the first basecoat coating composition does not differ by more than 20% from the absolute value of the weight content of solid resin in the second basecoat coating composition;
  • the total solid resin content of the first basecoat coating composition can accordingly be 16 to 24% by weight.
  • the solid resin content of the first coating agent is particularly preferably equal to or higher than that of the second basecoat coating agent.
  • the first basecoat coating composition can be produced from the second basecoat coating composition by admixing a corresponding amount of polyurethane resin.
  • the higher proportion of polyurethane resin can be determined by the same or different polyurethane resins.
  • polyurethane resins that can make up the higher proportion in the first water-based lacquer are the polyurethane resins described above as being suitable as binders for water-based lacquers.
  • the proportion of polyurethane resin used for the second and third coating layers produced by the process according to the invention can also be different from other water-based lacquers, but preferably similar water-based lacquers.
  • the two water-based paints differ only in the above-mentioned distinguishing feature essential to the invention. This is explained in more detail below.
  • the first and the second water-based lacquer, apart from the excess polyurethane of the first water-based lacquer have the same solid resin composition, ie the same binders and optionally crosslinking agents and optionally paste resins are present. It is preferred if, taking into account the specifications according to the invention, the quantity of the respective components of the solid resin composition, apart from the excess polyurethane, only have a fluctuation range of less than 30%, particularly preferably less than 20% and particularly preferably less than 15%. In particular, it is preferred if the two waterborne basecoats do not differ in terms of their qualitative or quantitative solid resin composition, with the exception of the distinguishing criterion essential to the invention.
  • the waterborne basecoat used to produce the second coating layer has a color tone which is close to or particularly preferably identical to that of the waterborne basecoat used to produce the third coating layer.
  • the color difference composed of the difference in brightness, hue and difference in color, between the hues of the second and third coating layers determined in each case with opaque coating and a measurement geometry of (45/0) -fold ⁇ E * (CIELAB) - value does not exceed.
  • the ⁇ E * (CIELAB) reference value is the value which results in the CIE-x, y diagram (chromaticity diagram) familiar to the person skilled in the art based on DIN 6175 for the color of the third coating layer, and the following relationship applies:
  • all customary clear lacquers or transparent colored or colorless pigmented coating compositions are suitable as clear coating compositions for the production of the fourth and possibly further coating layers.
  • These can be single-component or multi-component clear lacquer coating compositions. They can be solvent-free (liquid or as a powder clearcoat), or they can be systems based on solvents, or they can be water-dilutable clearcoats, the binder systems of which are suitable, e.g. anionic, cationic or non-ionic, are stabilized.
  • 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 the customary clearcoat coating compositions which are known to the person skilled in the art and 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. 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 (base resins).
  • powder clearcoat systems which can be used as clearcoat in the process according to the invention can be found in EP-A-0 509392, EP-A-0509393, EP-A-0 522648, EP-A-0 544 206, EP-A- 0555 705, DE-A-42 22 194, DE-A-42 27 580.
  • the transparent coating can be applied in a single layer or in the form of several layers from the same or from several different transparent coating agents.
  • the transparent coating layer is expediently applied as a fourth layer comprising only one clear lacquer coating agent.
  • Electrically conductive materials such as metals are suitable as the substrate for the method according to the invention.
  • Particularly suitable are e.g. Automobile bodies or parts thereof, they can consist of pretreated or untreated metal, of metal provided with an electrically conductive layer or of electrically conductive or plastic provided with an electrically conductive layer.
  • the first coating layer in particular in the form of a
  • Corrosion protection primer electrophoretically in the usual way and in a dry layer thickness of usual for ETL primers for example, 15 to 35 microns deposited and baked.
  • a dry layer thickness of usual for ETL primers for example, 15 to 35 microns deposited and baked.
  • multi-layer coatings are obtained with more than the four coating layers produced according to the invention, but within the scope of the present invention the electrocoat layer applied first in the method according to the invention is referred to as the first coating layer.
  • the second coating layer composed of the first coloring and / or effect-imparting water-based lacquer is preferably applied to the substrate provided with the baked ETL layer in one spray pass in one of the
  • Coverage of the color tone-dependent dry layer thickness of 10 to less than 30 ⁇ m, for example 10 to 29 ⁇ m, preferably 10 to 25 ⁇ m, particularly preferably 10 to 20 ⁇ m.
  • suitable spray application methods are compressed air spraying, airless spraying or electrostatic (ESTA) high-rotation spraying, electrostatic spraying being the preferred application method for applying the first water-based lacquer.
  • Waterborne basecoat in one spray pass preferably by compressed air spraying, preferably in a smaller dry layer thickness than the second coating layer, applied from only 7 to 15 ⁇ m and briefly vented, if appropriate at temperatures up to 80 ° C., for example for 1 to 5 minutes, for example by the action of infrared radiation.
  • the clear lacquer is applied in a wet-on-wet process.
  • the fourth coating layer is overpainted from a customary liquid clear lacquer or powder clear lacquer (in this case it is a dry-in-wet application) in a dry layer thickness customary for clear lacquer layers of, for example, 30 to 80 ⁇ m, preferably 30 to 60 ⁇ m, and together baked with the second and third coating layers.
  • a customary liquid clear lacquer or powder clear lacquer in this case it is a dry-in-wet application
  • a dry layer thickness customary for clear lacquer layers of, for example, 30 to 80 ⁇ m, preferably 30 to 60 ⁇ m, and together baked with the second and third coating layers.
  • the stoving temperature is when the three are stoved together
  • the method according to the invention permits the production of four- or multi-layer coatings, in particular automotive coatings with a reduced overall layer thickness and comparable overall property level compared to the prior art, which includes filler layers and / or other intermediate layers. Only two burn-in steps are necessary. It has been shown that excellent properties are achieved by the procedure according to the invention, although this makes it possible to dispense with conventional filler layers.
  • Example 1 state of the art, painting with filler layer
  • a water-based paint (blue metallic) with a dry layer thickness of 15 ⁇ m is applied by spraying to a customary phosphated body panel pre-coated by cathodic dip painting and with a 30 ⁇ m thick filler layer. After application, the product is briefly flashed off and then predried at 80 ° C. for 10 minutes. It is then overpainted with a commercially available 2K-HS automotive series clear coat (two-component high-solid clear coat based on acrylic resin / polyisocyanate) in a dry layer thickness of 40 ⁇ m and dried for 30 minutes at 130 ° C (object temperature).
  • the water-based paint (blue metallic) consisted of the following components:
  • the solid resin content (absolute value of the weight content of solid resin) of this water-based lacquer is 13.8% by weight.
  • the waterborne basecoat (blue metallic) from Example 1 is applied to a customary phosphated and pre-coated bodywork sheet by cathodic dip coating in a dry layer thickness of 15 ⁇ m. After application, the product is flashed off briefly and then a second layer of the same waterborne basecoat is applied in a dry layer thickness of 10 ⁇ m, likewise by spraying. It is predried at 80 ° C. for 10 minutes. Then the 2K-HS automotive series clearcoat from Example 1 is overpainted in a dry layer thickness of 40 ⁇ m and dried for 30 minutes at 130 ° C (object temperature).
  • Example 2 is repeated with the difference that the 15 ⁇ m thick lacquer layer applied to the KTL layer is not applied from the water-based lacquer (blue-metallic) from example 1, but from a modified water-based lacquer (blue-metallic), while the subsequently in 10 ⁇ m dry layer thickness applied lacquer layer as in example 2 is produced from the water-based lacquer (blue-metallic) from example 1.
  • the modified waterborne basecoat (blue metallic) is produced by mixing 87 parts of the waterborne basecoat (blue metallic) from Example 1 with 13 parts of an aqueous polyurethane resin adjusted to a solids content of 34% by weight. The following are used as aqueous polyurethane resins:
  • Example 4 state of the art, painting with filler layer
  • the waterborne basecoat (black) described below is applied to a customary phosphated and pre-coated by cathodic dip painting and pre-coated with a 30 ⁇ m thick filler layer in a dry layer thickness of 20 ⁇ m. After application, the product is briefly flashed off and then predried for 10 minutes at ⁇ o'c.
  • Example 2K-HS automotive series clearcoat from Example 1 is overpainted in a dry layer thickness of 40 ⁇ m and dried for 30 minutes at 130'C (object temperature).
  • the water-based paint (black) consisted of the following components:
  • This waterborne basecoat has a solid resin content of 21.9% by weight.
  • Example 5 comparative, painting without filler layer
  • the water-based paint (black) from Example 4 is applied to a customary phosphated and pre-coated bodywork sheet by cathodic dip coating in a dry layer thickness of 15 ⁇ m. After application, the product is briefly flashed off and then a second layer of the same waterborne basecoat is applied in a dry layer thickness of 10 ⁇ m, likewise by spraying. It is predried at 80 ° C. for 10 minutes. Subsequently, the 2K-HS automotive series clearcoat from Example 1 is overpainted in a dry layer thickness of 40 ⁇ m and dried for 30 minutes at 13 ° C. (object temperature).
  • Example 5 is repeated with the difference that the 15 ⁇ m thick lacquer layer applied to the KTL layer is not applied from the water-based lacquer (black) from example 4, but from a modified water-based lacquer (black), while the one subsequently applied in a 10 ⁇ m dry layer thickness Lacquer layer as in Example 5 is produced from the water-based lacquer (black) from Example 4.
  • the modified waterborne basecoat (black) is prepared by mixing 85 parts of the waterborne basecoat (black) from Example 4 with 15 parts of an aqueous polyurethane resin adjusted to a solids content of 34% by weight. The following are used as aqueous polyurethane resins:
  • the water-based paints 6a), 6b) and 6c) each have a solid resin content of 23.7% by weight.
  • Table 1 summarizes the results of the stone chip tests carried out.

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  • Paints Or Removers (AREA)

Abstract

Procédé pour l'application de peinture en plusieurs couches sur un substrat comportant une première couche de peinture cuite au four appliquée au trempé. Ledit procédé consiste à appliquer une deuxième couche, d'une épaisseur à sec de 10 à 30 νm, constituée d'une première peinture d'apprêt aqueuse contenant une résine de polyuréthanne, puis à appliquer humide sur humide une troisième couche, d'une épaisseur à sec inférieure, c'est-à-dire comprise entre 7 et 15 νm, constituée d'une deuxième peinture d'apprêt aqueuse, et à appliquer, sans cuisson au four préalable, une couche de vernis, l'ensemble étant ensuite cuit au four. La première couche de peinture d'apprêt présente une teneur en résine de polyuréthanne supérieure à la deuxième.
EP97903326A 1996-02-23 1997-02-19 Procede pour l'application de peinture en plusieurs couches Expired - Lifetime EP0881954B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19606716A DE19606716C1 (de) 1996-02-23 1996-02-23 Verfahren zur Mehrschichtlackierung
DE19606716 1996-02-23
PCT/EP1997/000784 WO1997030795A1 (fr) 1996-02-23 1997-02-19 Procede pour l'application de peinture en plusieurs couches

Publications (2)

Publication Number Publication Date
EP0881954A1 true EP0881954A1 (fr) 1998-12-09
EP0881954B1 EP0881954B1 (fr) 1999-08-11

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP97903326A Expired - Lifetime EP0881954B1 (fr) 1996-02-23 1997-02-19 Procede pour l'application de peinture en plusieurs couches

Country Status (8)

Country Link
US (1) US5976343A (fr)
EP (1) EP0881954B1 (fr)
JP (1) JP4096069B2 (fr)
AU (1) AU1792497A (fr)
BR (1) BR9707608A (fr)
DE (2) DE19606716C1 (fr)
ES (1) ES2140962T3 (fr)
WO (1) WO1997030795A1 (fr)

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Also Published As

Publication number Publication date
DE59700330D1 (de) 1999-09-16
EP0881954B1 (fr) 1999-08-11
JP4096069B2 (ja) 2008-06-04
WO1997030795A1 (fr) 1997-08-28
JP2000505352A (ja) 2000-05-09
ES2140962T3 (es) 2000-03-01
DE19606716C1 (de) 1997-08-14
BR9707608A (pt) 1999-07-27
US5976343A (en) 1999-11-02
AU1792497A (en) 1997-09-10

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