EP1112126B1 - Verfahren zur herstellung zweischichtiger automobildecklackierungen - Google Patents

Verfahren zur herstellung zweischichtiger automobildecklackierungen Download PDF

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Publication number
EP1112126B1
EP1112126B1 EP00907551A EP00907551A EP1112126B1 EP 1112126 B1 EP1112126 B1 EP 1112126B1 EP 00907551 A EP00907551 A EP 00907551A EP 00907551 A EP00907551 A EP 00907551A EP 1112126 B1 EP1112126 B1 EP 1112126B1
Authority
EP
European Patent Office
Prior art keywords
basecoat
aqueous
waterborne
coat layer
organic solvents
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP00907551A
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German (de)
English (en)
French (fr)
Other versions
EP1112126A1 (de
Inventor
Ludwig Siever
Peter Minko
Holger Schmidt
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
EI Du Pont de Nemours and Co
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
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Application filed by EI Du Pont de Nemours and Co filed Critical EI Du Pont de Nemours and Co
Publication of EP1112126A1 publication Critical patent/EP1112126A1/de
Application granted granted Critical
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Anticipated expiration legal-status Critical
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/50—Multilayers
    • B05D7/52—Two layers
    • B05D7/53—Base coat plus clear coat type
    • B05D7/534—Base coat plus clear coat type the first layer being let to dry at least partially before applying the second layer

Definitions

  • the invention relates to a method for producing two-layer Automotive top coats made of basecoat and clearcoat topcoat.
  • One is e.g. known from GB-A-2 233 257.
  • Two-coat automotive top coats are produced by wet-on-wet application a transparent top coat on one by flashing pre-dried color and / or effect basecoat.
  • the non-aqueous basecoats contain organic Solvents in the order of, for example, from 55 to 80 wt .-%, while the aqueous basecoats only, for example, 10 to 25% by weight of organic solvents contain.
  • the trend is therefore towards one Substitution of basecoats based on organic solvents by aqueous Basecoats. For example, older paint shops in which non-aqueous Basecoats are processed by new ones for processing Water-based paints designed painting systems replaced.
  • the flash-off conditions for basecoat layers in painting systems for the application of basecoats based on organic solvents are different from those in Painting systems specially designed for the application of waterborne basecoats are.
  • there are ventilation conditions which are marked due to short flash-off times of, for example, 30 to 180 seconds Air temperatures of, for example, 20 to 30 ° C.
  • Air temperatures for example, 20 to 30 ° C.
  • Waterborne basecoats take longer Flash-off times at higher air temperatures to result in the flash-off process complete the production of a pre-dried basecoat film.
  • the flash-off times are therefore for example 5 to 10 minutes and the time during the drying Air temperatures are higher, for example at 40 to 80 ° C.
  • the object of the invention is to provide a method for manufacturing two-coat automotive top coats by wet-on-wet application of one aqueous basecoat and a clearcoat under Granting of short flash-off times of, for example, 30 to 180 seconds for the Basecoat.
  • the method should enable aqueous basecoats in to process automated automotive OEM painting systems for the Processing of non-aqueous basecoats are designed and only short flash-off times for allow the basecoat layers.
  • the task can be solved by observing the following conditions the formulation of aqueous basecoat coatings and compliance with the following Process conditions during the flashing off of these aqueous Basecoat coating agents applied coating layers.
  • the invention therefore relates to a method for producing a two-layer color and / or effect top coat Motor vehicle bodies in an automatic automotive painting system, wherein a transparent top coat layer from a clear lacquer coating agent onto one an aqueous color and / or effect basecoat and applied flashed-off basecoat and the two coating layers together branding, which is characterized in that an aqueous Basecoat coating agent used, which organic solvent accordingly contains a high solid value of 40 to 70%, and taking the basecoat film after their application and before application of the transparent top coat layer 30 to 180 Seconds with circulating air from 25 to 45 ° C with an air flow from 0.10 to 0.70 m / s, based on the surface provided with the aqueous basecoat film, vented.
  • aqueous basecoat coating compositions are used.
  • they each contain one or more conventional binders, organic Solvents and pigments and optionally fillers, crosslinkers and / or customary paint additives.
  • the aqueous used in the process according to the invention Basecoat coatings for example, have weight solids contents of 15 to 50% by weight, for effect waterborne basecoats it is preferably 15 to 30, for example % By weight, for plain-colored water-based paints it is preferably higher, for example 20 to 45% by weight.
  • the weight solids of the aqueous basecoat coating compositions is formed from the sum of the solid contributions of the binders, pigments, Fillers, crosslinkers and non-volatile additives common in paint.
  • the Weight ratio of pigment to binder in the aqueous basecoat coating composition is, for example, between 0.05: 1 to 3: 1, for effect water-based paints it is for example preferably 0.1: 1 to 0.6: 1, for plain-colored water-based paints it is preferably higher, for example at 0.1: 1 to 2.5: 1, in each case based on the Solid weight.
  • the ratio of pigment to binder is the sum of the parts by weight of coloring pigments, effect pigments and fillers related to the sum of the weight percentages of binder, Paste resin and crosslinker solids in the finished water-based paint.
  • the aqueous basecoat coating compositions used in the process according to the invention have a high solid value of 40 to 70%.
  • the high solid value of the aqueous basecoat coating compositions is calculated using the formula Solids content in% by weight x 100% Solids content in% by weight + content of organic solvents in% by weight.
  • Solvent content and solids content must therefore be coordinated so that according to the above formula gives a high solid value of 40 to 70%.
  • the waterborne basecoats used in the process according to the invention contain customary ones Binder systems stabilized ionically or non-ionically. These are preferred anionically and / or non-ionically stabilized. Anionic stabilization is preferred achieved by at least partially neutralized carboxyl groups in the binder, while non-ionic stabilization preferred by lateral or terminal Polyethylene oxide units in the binder is achieved.
  • the water-based paints can be physically drying in nature or crosslinkable to form covalent bonds his. In the case of crosslinking with the formation of covalent bonds Waterborne basecoats can be self- or externally crosslinking systems. In the latter case, it can be one-component or multi-component water-based paints act.
  • the waterborne basecoats used in the process according to the invention contain a or several common film-forming binders. You can if the binders don't are self-crosslinking or self-drying, optionally also contain crosslinking agents. Both the binder component and the crosslinker component which may be present is not subject to any limitation.
  • film-forming binders for example Usual polyester, polyurethane and / or poly (meth) acrylate resins can be used.
  • the selection of the crosslinking agents which may be present is not critical, it is directed in a manner familiar to the person skilled in the art according to the functionality of the binders.
  • the waterborne basecoats used in the process according to the invention contain color and / or effect pigments and optionally fillers.
  • coloring inorganic or organic pigments and fillers are titanium dioxide, micronized titanium dioxide, iron oxide pigments, carbon black, silicon dioxide, barium sulfate, micronized mica, talc, kaolin, chalk, layered silicates, azo pigments, Phthalocyanine pigments, quinacridone pigments, pyrrolopyrrole pigments, Perylene pigments.
  • effect pigments are metal pigments, e.g. out Aluminum, copper or other metals; Interference pigments such as metal oxide coated metal pigments, e.g. titanium dioxide coated aluminum, coated mica such as titanium dioxide coated mica, Graphite effect pigments, platelet-shaped iron oxide, platelet-shaped Copper phthalocyanine pigments.
  • Effect pigments are generally presented in the form of a commercially available aqueous or non-aqueous paste, optionally mixed with preferably water-dilutable organic solvents and additives and then mixed with an aqueous binder under scissors.
  • Powdery effect pigments can first be processed into a paste with preferably water-dilutable organic solvents and additives.
  • Color pigments and / or fillers can be rubbed, for example, in part of the aqueous binder. The rubbing can preferably also take place in a special water-thinnable paste resin. Grinding can be carried out in conventional units known to those skilled in the art. Then complete with the remaining portion of the aqueous binder or the aqueous paste resin for finished pigment pigment grinding.
  • the waterborne basecoats used in the process according to the invention can contain further paint additives in conventional paint quantities, for example between 0.1 and 5% by weight, based on their solids content.
  • further additives are neutralizing agents, anti-foaming agents, wetting agents, adhesion-promoting substances, catalysts, leveling agents, anti-cratering agents, light stabilizers and thickeners such as, for example, synthetic polymers with ionic and / or associative groups such as polyvinyl alcohol, poly (meth) acrylamide, poly (meth) acrylic acid , Polyvinylpyrrolidone, hydrophobically modified ethoxylated polyurethanes or polyacrylates, crosslinked or uncrosslinked polymer microparticles.
  • the organic solvent in the waterborne basecoats preferably consists of 30 up to 60% by weight of low-boiling, for example preferably below 120 ° C. boiling, miscible with water or without a miscibility gap, for example one Water solubility at 20 ° C of more than 70 g per liter of water, organic solvents.
  • Such organic ones are preferably selected Solvents from methanol, ethanol, n-propanol, isopropanol, n-butanol, 2-butanol, Isobutanol, methoxypropanol, methyl ethyl ketone, acetone or mixtures thereof; n- and isopropanol are particularly preferred.
  • Water-based paints used in the process may be present, and preferably 40 to 70 Make up% by weight of the organic solvent composition in the waterborne basecoat are monohydric alcohols with 5 and more carbon atoms, e.g. Hexanol; Ethylene glycol ether or ester, e.g. Ethylene glycol dimethyl ether, Diethylene glycol mono- or di-C1-C6-alkyl ether, butyl glycol, butyl diglycol, Ethyl glycol acetate, butyl glycol acetate; Propylene glycol ether or ester, e.g.
  • monohydric alcohols with 5 and more carbon atoms e.g. Hexanol
  • Ethylene glycol ether or ester e.g. Ethylene glycol dimethyl ether, Diethylene glycol mono- or di-C1-C6-alkyl ether, butyl glycol, butyl diglycol, Ethyl glycol a
  • the water-based paints are applied to motor vehicle bodies, which can consist of one type of substrate or of several types of substrates connected to one another in a mixed construction.
  • it is metallic or plastic substrates.
  • plastic substrates can be provided with a plastic primer, for example, metallic substrates generally have a primer applied, for example, electrophoretically and, if appropriate, additionally one or more further lacquer layers, such as a filler layer.
  • the water-based varnishes are by spraying in one or more coats to a dry film thickness of 10 to 50 ⁇ m is applied, for effect water-based paints the dry film thickness is, for example, preferably 10 to 25 ⁇ m, for single-color aqueous base lacquers it is preferably higher, for example from 15 to 40 ⁇ m .
  • Waterborne basecoat and clearcoat are applied in the invention Process according to the known wet-on-wet principle, i.e. those from the aqueous Basecoat coating agent applied basecoat is applied before the application of the The clear coat is first pre-dried by flashing off.
  • the invention Pre-drying by ventilation is important so that the finished two-coat finish both the requirements on the technological properties such as Adhesion and stone chip resistance as well as to the optical properties such as For example, color, effect formation and top coat level met.
  • aqueous basecoat coating agents used in the process according to the invention it is essential to the invention that one from the aqueous basecoat created basecoat layers after application and before application of the transparent Top coat layer 30 to 180 seconds with air circulation from 25 to 45 ° C with a Air flow rate from 0.10 to 0.70 m / s, based on that with the aqueous Basecoat provided surface, vented.
  • the applied waterborne basecoat is flashed off in the Basecoat flash-off zone of automotive OEM painting and lasts 30 to 180 Seconds, preferably 60 to 150 seconds. This time period results, for example from the overall length of the basecoat flash-off zone of the automotive OEM painting system from for example 5 to 15 m and the belt speed of for example 2 to 6 m / min.
  • the ventilation takes place under recirculating air conditions Air temperatures of 25 to 45 ° C, preferably 30 to 40 ° C.
  • the ambient air conditions are chosen so that with a coated with an aqueous basecoat Surface air flow rate from 0.10 to 0.70 m / s, preferably 0.15 to 0.60 m / s is worked.
  • the surface coated with an aqueous basecoat The air flow obtained is calculated as the quotient of the per second through the Exhaust zone the air volume in cubic meters and that in the exhaust zone existing surface coated with aqueous basecoat and to be vented, for example on the order of 20 to 150 square meters. That in Process according to the invention through the vented air volume is, for example, 1 to 2 cubic meters per running meter of ventilation zone and Second.
  • the one in the flash-off zone is coated with an aqueous basecoat and surface to be ventilated is calculated from the number of in the basecoat flash-off zone coated motor vehicle bodies, e.g.
  • the air is vented under circulating air conditions.
  • the circulating air 5 to 15 g of water per cubic meter having.
  • the fresh air contains preferably less than 15 g, particularly preferably 5 to 12 g of water per cubic meter.
  • the adjustment of the water content of the admixed fresh air can be done by conventional means Dehumidification methods such as Compression of air and / or condensation or absorption of water from air.
  • the circulating air is expediently at a flow rate of 4 to 8 m / s, measured on the object, moved. It is preferably a turbulent air flow from top to bottom and from the sides to the with of the body to be ventilated is provided.
  • the air duct expediently takes place evenly and perpendicularly to the air to be vented Basecoat. The air is expediently extracted downwards.
  • the flash-off zone can be under constant operating conditions or under variation single or multiple operating parameters can be operated.
  • the variation of Operating parameters can take the form of a continuous or abrupt change over the entire length or one or more parts of the length of the Flash off zone.
  • the venting zone can be in one or more, for example 1 to 3 zones can be divided, which can be separated from one another by locks.
  • the variation of the operating parameters during the ventilation always lies within the limits set by the invention for the whole ventilating process.
  • the venting zone in 2nd Zones is divided, with the bodies coated with water-based paint first in the first zone at low air temperatures, for example from 25 to 30 ° C, and then in the second zone at higher air temperatures, for example 30 ventilated up to 45 ° C;
  • the air throughput can be, for example, in both Zones are selected to be the same height or different, for example in the first Zone lower than in the second, for example, the measured on the object Circulating air flow velocity in the second zone above 8 m / s lie.
  • the average air flow rate however, within that of the invention predetermined limits.
  • the pre-dried by flashing off the water base coat layers are overcoated with a conventional m chemically cross-linking clear coat in a dry layer thickness of, for example 30 to 100 ⁇ and baked together with the latter at temperatures of, for example 100 to 150 ° C.
  • An advantage of the method according to the invention results from the low air temperatures that prevail during the ventilation of the water-based lacquer layers. It is thus possible for the flashed-off basecoat layers to be overpainted with a clear lacquer without the bodies having cooled down beforehand.
  • all known clearcoats or transparent pigmented coating agents are suitable as clearcoats.
  • Solvent-containing one-component (1K) or two-component (2K) clearcoats, water-dilutable 1K or 2K clearcoats, powder clearcoats or aqueous powder clearcoat slurries can be used.
  • the stoving conditions of the two-coat system consisting of waterborne basecoat and clearcoat depend on the clearcoat system used.
  • the method according to the invention allows the production of two layers Motor vehicle topcoats made from aqueous basecoat and clearcoat according to the wet-on-wet method with only short flash-off times from 30 to 180 seconds for the basecoat film. It is with the method according to the invention possible to apply waterborne basecoats in automated automotive painting systems are designed for the processing of non-aqueous basecoats and only short Allow flash-off times for the basecoat layers to be processed. An elaborate Conversion of such unsuitable for the processing of aqueous basecoats Painting systems can be avoided.
  • the method according to the invention can even be carried out in this way be that both the Waterborne basecoats as well as non-aqueous basecoats can be processed.
  • a car body is coated in a painting booth for experimental purposes:
  • a cathodic electrodeposition primed and provided with a filler layer 4.3 m long car chassis is in a dry film thickness of 15 ⁇ m with a silver-colored water-based paint (composition: Solids content 20 wt .-%, dimethylethanolamine 1 wt .-%, butylglycol 8.5 % By weight, N-methylpyrrolidone 2% by weight, water 59% by weight, n-propanol 7% by weight, n-butanol 2.5% by weight, high solid value: 50%; Pigment / binder ratio: 0.2: 1) coated.
  • the coated area is approximately 20 square meters.
  • the mixture is then vented in a 5 m long ventilation zone with circulating air (water content 12 g per cubic meter) of 40 ° C for 90 s.
  • the air circulation rate is 1.5 cubic meters per second and running meter of ventilation zone.
  • venting is m painted and baked 30 minutes at 135 ° C (object temperature) with a commercial two-component clear coat in a dry film thickness of 35 ⁇ .
  • the paint obtained is cooker-free and corresponds to the others technological requirements of modern automotive painting.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Glass Compositions (AREA)
EP00907551A 1999-02-15 2000-02-11 Verfahren zur herstellung zweischichtiger automobildecklackierungen Expired - Lifetime EP1112126B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19906247A DE19906247A1 (de) 1999-02-15 1999-02-15 Verfahren zur Herstellung zweischichtiger Automobildecklackierungen
DE19906247 1999-02-15
PCT/EP2000/001132 WO2000048748A1 (de) 1999-02-15 2000-02-11 Verfahren zur herstellung zweischichtiger automobildecklackierungen

Publications (2)

Publication Number Publication Date
EP1112126A1 EP1112126A1 (de) 2001-07-04
EP1112126B1 true EP1112126B1 (de) 2001-12-05

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ID=7897539

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Application Number Title Priority Date Filing Date
EP00907551A Expired - Lifetime EP1112126B1 (de) 1999-02-15 2000-02-11 Verfahren zur herstellung zweischichtiger automobildecklackierungen

Country Status (13)

Country Link
US (1) US6548119B1 (enExample)
EP (1) EP1112126B1 (enExample)
JP (1) JP2002537099A (enExample)
KR (1) KR100603997B1 (enExample)
CN (1) CN1156341C (enExample)
AT (1) ATE209972T1 (enExample)
AU (1) AU759783B2 (enExample)
BR (1) BR0008215B1 (enExample)
CZ (1) CZ299010B6 (enExample)
DE (2) DE19906247A1 (enExample)
ES (1) ES2170048T3 (enExample)
MX (1) MXPA01008258A (enExample)
WO (1) WO2000048748A1 (enExample)

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DE10043405C1 (de) * 2000-09-04 2002-06-27 Basf Coatings Ag Verfahren zur Herstellung farb- und/oder effektgebender Lackierungen
DE10045608A1 (de) * 2000-09-15 2002-03-28 Volkswagen Ag Verfahren und Vorrichtung zum Trocknen einer lackierten Kraftfahrzeugkarosserie
WO2003039767A1 (fr) * 2001-11-05 2003-05-15 Kansai Paint Co., Ltd. Procede de formation de film a revetement multicouches
US20060035692A1 (en) * 2002-02-08 2006-02-16 Keith Kirby Collectible item and code for interactive games
TW200530352A (en) * 2004-02-09 2005-09-16 Nippon Paint Co Ltd Metallic base coating composition and process for producing a composite film
US20050250416A1 (en) * 2004-04-23 2005-11-10 Barthold Mark J Toy and card package
US20050250415A1 (en) * 2004-04-23 2005-11-10 Barthold Mark J Toy and card package
US7166331B2 (en) * 2004-05-10 2007-01-23 E. I. Du Pont De Nemours And Company Process for the production of multi-layer coatings comprising a waterborne primer-surfacer layer and a topcoat applied thereto
US20060079149A1 (en) * 2004-10-08 2006-04-13 Nathan Proch Cut-out logo display
US20060076735A1 (en) * 2004-10-08 2006-04-13 Nathan Proch Wheel having a translucent aspect
US20060079150A1 (en) * 2004-10-08 2006-04-13 Miva Filoseta Toy for collecting and dispersing toy vehicles
US20060078684A1 (en) * 2004-10-08 2006-04-13 Neo Tian B Paint process for toys
DE102005001683B4 (de) * 2005-01-13 2010-01-14 Venjakob Maschinenbau Gmbh & Co. Kg Verfahren und Vorrichtung zum Trocknen von Lackschichten
EP2394746A1 (de) 2010-06-14 2011-12-14 Saint-Gobain Glass France Verfahren zur Flutbeschichtung eines polymeren Werkstoffes
EP2394747A1 (de) 2010-06-14 2011-12-14 Saint-Gobain Glass France Verfahren zur Flutbeschichtung eines polymeren Werkstoffes
US20230347380A1 (en) * 2020-09-15 2023-11-02 Axalta Coating Systems Ip Co., Llc Methods for coating substrates
CN116809350A (zh) * 2022-03-22 2023-09-29 本田技研工业株式会社 涂装方法及涂装系统

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JPH02144179A (ja) * 1988-11-22 1990-06-01 Bou Kojima 被塗装物へのポリテトラフルオロエチレン系塗料のコーティング方法
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US5168105A (en) * 1990-09-10 1992-12-01 Basf Corporation Metallic water borne base coat composition based on acrylic latex resins using an acrylic resin having acid and nonionic functionality for aluminum storage and a treated hetorite clay for rheology control-water base 5
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US6035547A (en) * 1998-08-17 2000-03-14 Chrysler Corporation Water-borne basecoat flash process

Also Published As

Publication number Publication date
KR20010102145A (ko) 2001-11-15
CZ20012941A3 (cs) 2002-03-13
CN1156341C (zh) 2004-07-07
DE50000049D1 (de) 2002-01-17
WO2000048748A1 (de) 2000-08-24
MX229728B (enExample) 2005-08-05
BR0008215A (pt) 2001-10-30
KR100603997B1 (ko) 2006-07-25
CN1339989A (zh) 2002-03-13
BR0008215B1 (pt) 2011-03-22
MXPA01008258A (es) 2002-10-23
JP2002537099A (ja) 2002-11-05
DE19906247A1 (de) 2000-08-17
AU759783B2 (en) 2003-05-01
AU2910400A (en) 2000-09-04
ES2170048T3 (es) 2002-08-01
ATE209972T1 (de) 2001-12-15
US6548119B1 (en) 2003-04-15
CZ299010B6 (cs) 2008-04-02
EP1112126A1 (de) 2001-07-04

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