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EP0061165B1 - Voiture automobile avec enduit de vernis multicouche et procédé pour vernir en multicouche - Google Patents

Voiture automobile avec enduit de vernis multicouche et procédé pour vernir en multicouche Download PDF

Info

Publication number
EP0061165B1
EP0061165B1 EP82102250A EP82102250A EP0061165B1 EP 0061165 B1 EP0061165 B1 EP 0061165B1 EP 82102250 A EP82102250 A EP 82102250A EP 82102250 A EP82102250 A EP 82102250A EP 0061165 B1 EP0061165 B1 EP 0061165B1
Authority
EP
European Patent Office
Prior art keywords
layer
lacquer
binder
esters
lacquer layer
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
Application number
EP82102250A
Other languages
German (de)
English (en)
Other versions
EP0061165A1 (fr
Inventor
Hans-Joachim Dr. Dipl.-Chem. Graetz
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.)
Axalta Coating Systems Germany GmbH and Co KG
Original Assignee
Herberts GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6128120&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0061165(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Herberts GmbH filed Critical Herberts GmbH
Publication of EP0061165A1 publication Critical patent/EP0061165A1/fr
Application granted granted Critical
Publication of EP0061165B1 publication Critical patent/EP0061165B1/fr
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/50—Multilayers
    • B05D7/56—Three layers or more
    • B05D7/57—Three layers or more the last layer being a clear coat
    • B05D7/572—Three layers or more the last layer being a clear coat all layers being cured or baked together
    • 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
    • B05D2202/00—Metallic substrate

Definitions

  • the invention relates to a motor vehicle with a multi-layer coating comprising a colored lacquer layer containing polyester / amine resins as a binder, a transparent effect lacquer layer thereon containing polyester / amine resins and cellulose ethers and / or esters or semi-semesters as binders, and containing a clear lacquer layer thereon thermosetting acrylic / melamine resin combinations or air-drying acrylic / isocyanate resin combinations as binders.
  • the invention also relates to a method for multi-layer painting of motor vehicles. It is known to provide motor vehicles with a multilayer coating on one or more corrosion protection layers, in particular when the coating is to have a so-called metallic effect.
  • Corrosion protection layers in the sense of the present invention are understood to mean all protective layers or lacquer layers which are applied to the metal parts before the final lacquer is applied. This also includes the filler layers that are usually applied before the final coating. If a final coating with a metallic effect is carried out, this usually includes a two-layer coating. The lower layer contains metal platelets, generally aluminum platelets, to produce the so-called metallic effect. If not only the silver metallic effect of the aluminum platelets is desired, but a colored metallic coating, this layer also contains appropriate color pigments.
  • a clear lacquer is then applied to this lacquer layer containing the metal flakes.
  • the metallic coating can contain cellulose esters, in particular cellulose acetobutyrate (cf. US Pat. No. 3639147). According to this prior art, it is also possible to apply the metallic lacquer layer and the clear lacquer layer by the so-called wet-on-wet method, i.e. the metallic paint layer is not cured before the clear coat is applied, and both layers are then cured together.
  • DE-OS No. 3035917 describes a method for applying a multi-layer coating on a motor vehicle, according to which an effect lacquer layer is applied to a colored lacquer layer, which contains titanium dioxide-coated mica flakes as an interference pigment, and a clear lacquer layer is optionally applied thereon.
  • an effect lacquer layer is applied to a colored lacquer layer, which contains titanium dioxide-coated mica flakes as an interference pigment, and a clear lacquer layer is optionally applied thereon.
  • at least the effect lacquer layer is applied by an electrostatic application method.
  • a prerequisite for carrying out this process is that the colored lacquer layer is stoved before the effect lacquer layer can be applied.
  • the method described above has the disadvantage that the stoving process has to be carried out twice.
  • the parts of the motor vehicle which are not to be painted have to be taped twice.
  • the colored lacquer layer is applied and baked, whereby the parts that are not to be painted must be protected by masking before applying a paint.
  • the masking tape has to be removed and the lacquer layer is sanded wet in order to achieve a better bond with the lacquer layer applied afterwards.
  • the parts that are not to be painted must then be taped again before the effect lacquer layer and, if appropriate, the clear lacquer layer are applied and baked. This process is technically very complicated.
  • the present invention is based on the object of creating motor vehicles with an effect lacquer layer which, as in DE-OS No. 3035917, has a more iridescent effect or different effects at different angles of view than the known metallic lacquer, but which are applied in a simpler manner can. It has surprisingly been found that this problem can be solved in that the three layers of colored lacquer layer, effect lacquer layer and clear lacquer layer are applied wet-on-wet and cured in one operation if the colored lacquer layer has a certain composition defined below.
  • the invention accordingly relates to a motor vehicle with a multilayer coating comprising a colored lacquer layer containing polyester / amine resins as a binder, a transparent effect lacquer layer thereon containing polyester / amine resins and cellulose ethers and / or esters or semesters as a binder, and one thereon located clear coat containing thermosetting acrylic / melamine resin combinations or air-drying acrylic / isocyanate resin combinations as a binder, which is characterized in that the colored coat 15 to 60 wt .-%, based on the binder content of this layer, of cellulose ethers and / or esters or semesters.
  • the invention furthermore relates to a process for the multilayer coating of motor vehicles, comprising a colored lacquer layer containing polyester / amine resins as a binder, a transparent effect lacquer layer thereon containing polyester / amine resins and cellulose ethers and / or esters or half-esters as binders, and a clear lacquer layer thereon containing a thermosetting acrylic / melamine resin combination or air-drying acrylic / isocyanate resin combination as a binder, which is characterized in that the colored lacquer layer comprises 15 to 60% by weight, based on the binder content of this layer Contains cellulose ethers and / or esters or half-esters, and that all three layers mentioned are applied wet-on-wet and cured together in one operation, the effect lacquer layer being applied by an electrostatic application process.
  • the colored lacquer layer preferably has a dry film thickness of 10 to 30 ⁇ m.
  • the colored lacquer layer contains, as a binder, the polyester / amine resin systems known according to the prior art for motor vehicle coatings. Oil-containing or oil-free polyesters can be used, in particular alkyd resins. The polyesters are present in a mixture with amine resins, with melamine resins being preferred.
  • the colored lacquer layer contains pigments commonly used in automotive painting. If a white layer is desired, white pigments are used, otherwise colored pigments.
  • the essential feature according to the invention is that the colored lacquer layer contains the above-mentioned cellulose ethers etc. According to the prior art, such cellulose ethers were added to the metallic lacquers in order to quickly fix the metallic flakes.
  • Another essential feature of the method for multi-layer painting according to the invention is that the effect lacquer layer is applied by an electrostatic application process.
  • cellulose ethers, etc. those compounds are used for the colored lacquer layer which are used according to the prior art for the metallic lacquers. As in the prior art, cellulose acetobutyrate is preferred.
  • the amount for the colored lacquer layer according to the invention is preferably at least 30% by weight, and preferably at most 50% by weight, based on the binder content of this layer.
  • an essential feature according to the invention is that the effect lacquer layer applied to the color lacquer layer is transparent. This is understood to mean an at least partial transparency, as is obtained when mica flakes coated with titanium dioxide are used as interference pigments as pigments. These pigments are known (see e.g. DE-OS No. 1959998 and DE-AS No. 1467468).
  • the effect lacquer layer according to the invention preferably contains the same binders as the color lacquer layer, and as already described above, as binders.
  • the effect lacquer layer also contains the cellulose ethers, etc. described above, expediently in an amount of 15 to 60% by weight.
  • the lower limit is preferably about 20% by weight.
  • the upper limit is preferably 40% by weight.
  • the amount of cellulose ethers etc. in the colored lacquer layer according to the invention is relatively high compared to the prior art.
  • the dry film thickness of the effect lacquer layer is expediently in the range from about 5 to 25 J.Lm.
  • the lower limit is preferably around 10 ⁇ m, while the upper limit is preferably around 15 ⁇ m.
  • the electrostatic application methods known per se can be used.
  • the paint in a stationary system, the paint can be sprayed over a rotating bell or disc in an electrostatic field, so-called @ Randsburg systems. It can also be sprayed with known electrostatic spray guns.
  • a clear lacquer layer is applied to the effect lacquer layer, which has either thermosetting acrylic / melamine-resin combinations or air-drying acrylic / isocyanate-resin combinations as binders. Both paint systems are known in the field of painting motor vehicles. If the heat-curable combinations are used, all layers of paint must be cured together in one operation by heating to elevated temperatures.
  • the usual curing temperatures according to the prior art are applied, e.g. B. from about 70 ° C to 170 ° C for periods of about 10 to 40 min, the duration of the baking process is usually inversely proportional to the temperature used.
  • the known air-drying systems are used according to the invention, which is mainly the case in motor vehicle refinishing
  • the motor vehicle provided with the three layers of lacquer according to the invention is dried under environmental conditions or to moderate temperatures of not more than about 80 ° C. warmed up. All three layers of paint are cured.
  • the dry film thickness of the clear lacquer layer is expediently 15 to 50 ⁇ m, 20 ⁇ m being preferred for the lower limit and 40 ⁇ m for the upper limit.
  • acrylic also means methacrylic resin systems, as are also used in this field according to the prior art (cf., inter alia, US Pat. No. 3639147, GB Pat. No. 1284755, DE-OS No. 2812397).
  • the proportion of coated with titanium dioxide Mica flakes in the effect lacquer layer are expediently 0.5 to 8% by weight, preferably at least about 1% by weight and at most about 6% by weight, calculated on the total weight of the lacquer. (Calculated on solids about 3 to 40 wt .-%, preferably 4 to 30 wt .-%, depending on the color of the substrate.)
  • those of the resin systems described above are preferably used which physically dry in 1 to 15, preferably 2 to 12, particularly preferably 3 to 8 minutes.
  • the effect lacquer layer it is expedient to apply the effect lacquer layer to the colored lacquer layer after 1 to 15, preferably 2 to 12, particularly preferably 3 to 8 minutes.
  • the layers applied in front of it must, as explained above, physically dry within the stated time to such an extent that substantial mixing or greater swelling of the lacquer layers applied to them is avoided during application.
  • the above-mentioned drying times for the effect varnish also have the effect that the binder solidifies very quickly and that therefore the mica platelets coated with titanium dioxide can no longer move in the layer.
  • the mica flakes Shortly after the application of the effect lacquer layer, the mica flakes predominantly assume an arrangement approximately parallel to the substrate. This arrangement leads to the special effect.
  • the mica platelets move, in particular can rotate, for a longer period of time in the applied layer, there is a risk that they will adopt a different orientation to a considerable extent, as a result of which the iridescent effect would be reduced or avoided.
  • the interference effect is particularly pronounced and is strongly obtained when the layers, in particular the effect lacquer layer and the colored lacquer layer, have the strengths specified above.
  • lacquers used according to the invention naturally contain the usual lacquer additives and solvents.
  • a color coat of paint with a dry film thickness of 20 ⁇ m which contains an oil-free polyester and melamine resin and a content of 40% by weight cellulose acetobutyrate, based on the binder content of this layer, is applied to the body parts, which are provided with corrosion protection layers in the usual way.
  • an effect lacquer layer with a dry film thickness of 10 ⁇ m is applied, using an oil-free polyester and melamine resin as a binder, using a stationary system for electrostatic painting using a rotating bell in an electrostatic field.
  • the clear lacquer layer is applied thereon, which contains an acrylic / melamine resin combination which is customary in motor vehicle painting in a customary solvent mixture.
  • the dry film thickness of this layer is approximately 30 ⁇ m. Then baked at about 140 ° C for 20 min.
  • a motor vehicle with a conventional filler coating is sanded. Then a colored lacquer layer is applied using the usual spraying method with a dry film thickness of 25 ⁇ m, which contains an oil-free polyester and melamine resin, has a content of 35% cellulose acetobutyrate, based on the binder content of this layer, and 55% rutile titanium dioxide, calculated on the total solid content , as well as usual paint additives and solvents.
  • the effect varnish is applied in a dry film thickness of 15 ⁇ m using an electrostatic hand spray gun.
  • a binder it contains an oil-free polyester, melamine resin and 30% by weight of cellulose acetobutyrate, based on the binder, and 5% by weight, based on the lacquer of the interference pigment described in Example 1.
  • a clear lacquer containing an acrylic / isocyanate-resin combination as a binder is applied in a dry film thickness of 30 ⁇ m. The mixture is then heated to 80 ° C. for 10 minutes or 50 ° C. for 1 hour, or else is dried under environmental conditions.
  • the vehicles painted in this way have an impressive iridescent effect. If the viewing direction is essentially vertical, the hue essentially corresponds to the hue of the interference pigment used. When the viewing angle changes, the background color appears more clearly.

Landscapes

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

Claims (4)

1. Véhicule automobile comportant une peinture multicouche, incluant une couche de laque colorée contenant comme liants des polyesters et des résines aminées, une couche transparente de laque à effets décoratifs située sur la couche précédente et contenant comme liants des polyesters/des résines aminées ainsi que des éthers de cellulose et/ou des esters ou des demi-esters de cellulose, et une couche de vernis située sur la couche précédente et contenant comme liants des combinaisons thermodurcissables de résines acryliques et de résines à la mélamine ou bien des combinaisons, séchant à l'air, de résines acryliques et de résines à base d'isocyanate, caractérisé en ce que la couche de laque colorée contient 60% en poids, rapportés à la teneur en liant de cette couche, d'éthers et/ou d'esters ou de demi-esters de cellulose.
2. Véhicule automobile selon la revendication 1, caractérisé en ce que la couche de laque colorée possède une épaisseur de couche à sec comprise entre 10 et 30 µm.
3. Procédé pour appliquer à des véhicules automobiles une peinture multicouche incluant une couche de laque colorée contenant comme liants des polyesters et des résines aminées, une couche transparente de laque à effets décoratifs située sur la couche précédente et contenant comme liants des polyesters/des résines aminées ainsi que des éthers de cellulose et/ou des esters respectivement des demi-esters de cellulose, et une couche de vernis située sur la couche précédente et contenant comme liants des combinaisons thermodurcissables de résines acryliques et de résines à la mélamine ou bien des combinaisons séchant à l'air de résines acryliques et de résines à base d'isocyanate, caractérisé en ce que la couche de laque colorée contient entre 15 et 60% en poids, rapportés à la teneur en liant de cette couche, d'éthers et/ou d'esters respectivement de demi-esters de cellulose et que l'on dépose les trois couches selon le procédé mouillé sur mouillé et qu'on les fait durcir en commun en une phase opératoire, la couche de laque à effets décoratifs étant déposée au moyen d'un procédé de dépôt électrostatique.
4. Procédé selon la revendication 3, caractérisé en ce qu'on dépose la couche de laque colorée en une quantité telle que l'épaisseur de couche à sec est comprise entre 10 et 30 µm.
EP82102250A 1981-03-24 1982-03-19 Voiture automobile avec enduit de vernis multicouche et procédé pour vernir en multicouche Expired EP0061165B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3111478 1981-03-24
DE19813111478 DE3111478A1 (de) 1981-03-24 1981-03-24 Kraftfahrzeug mit mehrschichtiger lackierung und verfahren zum mehrschichtigen lackieren

Publications (2)

Publication Number Publication Date
EP0061165A1 EP0061165A1 (fr) 1982-09-29
EP0061165B1 true EP0061165B1 (fr) 1984-08-01

Family

ID=6128120

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82102250A Expired EP0061165B1 (fr) 1981-03-24 1982-03-19 Voiture automobile avec enduit de vernis multicouche et procédé pour vernir en multicouche

Country Status (7)

Country Link
EP (1) EP0061165B1 (fr)
JP (1) JPS57171473A (fr)
AU (1) AU8185682A (fr)
BR (1) BR8201616A (fr)
DE (2) DE3111478A1 (fr)
ES (1) ES8308231A1 (fr)
ZA (1) ZA821928B (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59160571A (ja) * 1983-03-02 1984-09-11 Toyota Motor Corp 塗装仕上げ方法
JPS6121761A (ja) * 1984-07-11 1986-01-30 Kansai Paint Co Ltd メタリツク仕上げ方法
US4539258A (en) * 1984-07-23 1985-09-03 Inmont Corporation Substrate coated with opalescent coating and method of coating
ZA854963B (en) * 1984-07-23 1986-02-26 Inmont Corp Opalescent coating
DE3709978A1 (de) * 1987-03-26 1988-10-06 Herberts Gmbh Verfahren zur herstellung von pigmentierten, lufttrocknenden metallic-basislacken, und deren verwendung
DE3721703A1 (de) * 1987-07-01 1989-01-12 Herberts Gmbh Verfahren und vorrichtung zum lackieren von werkstuecken mit elektrisch isolierender oberflaeche durch elektrostatischen auftrag bzw. spritzauftrag
DE3727081A1 (de) * 1987-08-14 1989-02-23 Merck Patent Gmbh Beschichtungen
US5425969A (en) * 1992-06-26 1995-06-20 Toyota Jidosha Kabushiki Kaisha Method of coating articles made of polypropylene with an electrically conductive primer and electrostatically applied overcoat
EP0688840A3 (fr) * 1994-06-20 1996-08-07 Herberts & Co Gmbh Composition de revêtement et son utilisation dans la préparation de revêtements multicouches
JP4507535B2 (ja) * 2003-09-02 2010-07-21 東亞合成株式会社 塗料用組成物
JP6955313B2 (ja) * 2017-10-30 2021-10-27 関西ペイント株式会社 多色仕上げ塗装方法及び塗装物の製造方法

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1469863A (fr) * 1965-03-01 1967-02-17 Eastman Kodak Co Nouvelles compositions thermodurcissables
US3370025A (en) * 1967-03-24 1968-02-20 Eastman Kodak Co Ethanolic lacquers based on cellulose butyrate
DE1644769B2 (de) * 1968-02-06 1975-11-06 Chemische Werke Huels Ag, 4370 Marl Überzugsmittel
DE1805196C3 (de) * 1968-10-25 1978-07-20 Chemische Werke Huels Ag, 4370 Marl Überzugsmittel
US3823101A (en) * 1968-12-06 1974-07-09 Aluminum Co Of America Opaque white coating composition comprising essentially cellulose ester/cross-linking agent/catalyst/solvent and organic liquid
DE2013702B2 (de) * 1970-03-21 1974-10-24 Chemische Werke Huels Ag, 4370 Marl Überzugsmittel
US3869305A (en) * 1971-08-10 1975-03-04 Aluminum Co Of America Method for producing an opaque coating
DE2163503A1 (de) * 1971-12-21 1973-07-19 Reichhold Albert Chemie Ag Ueberzugsmittel
GB1463490A (en) * 1973-09-26 1977-02-02 Ici Ltd Coating process
DE2702986A1 (de) * 1977-01-26 1978-07-27 Bayer Ag Vernetzende waessrige ueberzugsmittel
NZ186925A (en) * 1977-04-25 1979-12-11 Ici Ltd Top-coating based on a basecoat and top-coat compositions not requiring an intermediate baking operation
GB2012191B (en) * 1977-09-29 1982-03-03 Kodak Ltd Coating process utilising cellulose esters such as cellulose acetate butyrate
DE2806497C2 (de) * 1978-02-16 1982-02-18 Basf Farben + Fasern Ag, 2000 Hamburg Mehrschichtlackierung mit einem Klarlacküberzug als Schlußschicht

Also Published As

Publication number Publication date
DE3260489D1 (en) 1984-09-06
BR8201616A (pt) 1983-02-08
AU8185682A (en) 1982-09-30
EP0061165A1 (fr) 1982-09-29
ZA821928B (en) 1983-01-26
DE3111478A1 (de) 1982-10-07
JPS57171473A (en) 1982-10-22
ES510621A0 (es) 1983-08-16
ES8308231A1 (es) 1983-08-16

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