DE2740246A1 - METHOD OF APPLYING A COAT OF COLOR TO A SUPPORT SURFACE - Google Patents

Description

Process for applying a layer of paint to a carrier surface

The invention relates to a method for applying a color or Lacquer layer or top layer on a carrier, in particular for application to metallic articles.

When a paint layer or top coat is currently applied to a metallic substrate, for example a car or a vehicle body, the substrate is first pretreated in such a way that the adhering grease or rust spots are removed. Such pre-treatment usually consists of the use of chemicals to remove the grease and the use of abrasive or sandblasting techniques to remove the rust. With the usual methods, a primer is first applied to the pretreated substrate. Then one or more sub-layers and finally one or more top layers are applied. Each layer can dry before the next layer is applied / if a top layer of particularly high quality is required, the previous layers of primer, undercoat or topcoat are sanded using fine dry or wet sandpaper. This removes any unevenness, for example dust particles, which have accumulated in the paint during drying. Besides that

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numerous surface grooves are formed as a result, which support a connection with the following layer of paint. The final quality of the final layer does not depend on it to a small extent on the amount of work done before the paint is applied and between the individual layers of paint became. In addition, where a better or higher quality so-called vehicle finish was required, it was imperative Baked enamel process can be used.

The above-mentioned conventional method is time-consuming primarily because it is natural or artificial It takes a considerable amount of time for each coat of paint to dry before the next coat of paint can be applied.

The invention is based on the object of reducing the time required to produce surfaces with high quality.

This object is achieved according to the invention in that after the pretreatment of the surface of the support, either in the the aforementioned or in another way, successively different layers of paint are applied before the previous one Layer has dried.

The successive layers of paint are usually applied with a spray gun and then it is coated supports are preferably dried at a temperature suitable for the composition of the paint.

With the method according to the invention, a first-class surface quality can be achieved and since successive layers of paint are applied while the previous layers are still "wet", the so-called orange peel effects are greatly reduced. It has been found that acrylic resin-based paints are particularly suitable for use in the method of the invention.

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One or more layers of primer paint can be applied
the carrier can be applied before one or more
Layers of color are applied. With a preferred
Embodiment of the invention, a primer color layer is applied first and then at least one subsequent primer layer before the previous primer color layer has dried. A color coating is then applied to the base coated with primer color and at least one further color layer before the previous color layer has dried.

The invention is particularly suitable for applying cover layers to metallic articles, especially for cars or other vehicle bodies.

An exemplary embodiment of the method according to the invention is described below.

The surface of the part is hand-wiped with a gasoline-based solution to remove any extraneous material on the part
Matter is removed. The part is then sprayed with water at a temperature of 70-94 C and with a lye under a pressure of 35-42 kp / cm and then with
washed off in hot water.

A layer of zinc phosphate using a spray gun over the whole surface at 54 - 60 ⁰ C is applied. The coated surface is then thoroughly cleaned.
Then the surface is sprayed with chromic acid solution (50 parts water to one part acid) and then the part is
Dried in an oven at 150 ^° C. for 15 minutes. The pretreatment is completed by sanding the surface with emery paper and thoroughly cleaning it with an air jet and then wiping it with a clean cloth.

First, the surface is covered with a first layer of
coated in red primer. Then a second

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Layer of gray primer applied before the first layer is dry. The part can then dry for 5-10 minutes at a temperature of 30 ° C or evaporate ("flash-off"). There will be two additional layers of paint applied, the second before the first drying. In this way, a maximum film thickness of 4 - 6 mm can be produced. Even after that, the part can preferably for 8 minutes, but otherwise dry under the aforementioned conditions.

Drying in an oven is done at one oven temperature of 144 C. The temperature of the metal part is kept at not less than 138 ° C for 35 minutes.

In the method according to the invention, the carrier can preferably evaporate (flash-off). The evaporation can take place after the application of the last base coat before the application of the first A layer of paint takes place as well as before drying after the last layer of paint has been applied. '

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Claims (8)

Patent Attorneys ^D - ⁴⁸⁰⁰ Elsa-Brändström-Strasse 1 + 3 Dipl.-Ing. Bodo THIELKING Telephone: CO5213 60621 + 63313 Dipl.-Ing. Otto ELBERTZHAGEN _{ΤθΙθχ: β32Ο59} anw "", 9 7 A Π y U R Postal check account: Han 309193-302 Lawyer reference number: 11 466 Date: 6 9 1977 Patent claims: 1,) Method for applying a paint or varnish top layer on a carrier, characterized in that the surface of the carrier is first pretreated and then several colored or Cover layers are applied before the previously applied layer has dried. 2.) The method according to claim 1, characterized in that the Support is dried at a temperature appropriate to the composition of the applied paint and the applied Lacks is suitable. 3.) The method according to claim 1, characterized in that the drying temperature is not lower than 138 C. 4.) The method according to one or more of claims 1 to 3, characterized in that the paint is a thermosetting Contains acrylic stoving enamel. 5.) The method according to one or more of claims 1 to 4, characterized in that the paint or varnish means a spray gun is applied. 6.) Method according to one or more of claims 1 to 5, characterized in that, prior to the application of one or more layers of paint, a primer paint is first applied to the Carrier is applied. 7.) The method according to claim 6, characterized in that first a primer coat is applied and at least one subsequent primer coat before the previous one 809810/1015 466 - 2 - 6. Primer paint layer is dried and that then on the substrate coated with primer paint a paint layer and then at least one further paint layer
can be applied before the previously applied paint layer has dried. 8.) The method according to claim 7, characterized in that the carrier can evaporate or dry on ("flash-off") both after the application of the last primer layer before
Applying the first coat of paint as well as before
Drying after the last coat of paint has been applied. 809810/101 5 ORIGINAL INSPECTED