JPS61187970A - Flat-finish coating method - Google Patents

Abstract

PURPOSE:To reduce the variance in performance of a flat paint by coating a clear paint consisting essentially of an acrylic resin on the electrodeposited film, etc., on a material to be coated, then coating a solvent-type glossy colored paint thereon on a wet-on-wet basis and baking and drying the paints. CONSTITUTION:A clear paint consisting essentially of an acrylic resin is coated on the electrodeposited film or the intermediate coated film formed on a material to be coated, then a solvent-type glossy colored paint is coated thereon on a wet-on-wet basis and the paints are baked and dried. When flat finishing is carried out by this method, the settlement of a flat agent is prevented and the variance in the performance of the flat paint is reduced. Moreover, a pipeline to be exclusively used for the flat paint need not be provided and the equipment cost can be reduced.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is a wet-on coating after applying a melamine acrylic or non-aqueous dispersion acrylic clear paint.
This invention relates to a method of applying a solvent-type glossy colored paint in a wet manner and then baking and drying it to form a matte coating.

[Prior Art] Conventionally, many methods have been proposed as methods for forming a matte coating film.

For example, many coating methods have been used for many years to apply a matte paint in which an inorganic powder or an organic powder matting agent is dispersed in the paint.

[Problems to be Solved by the Invention] When applying matte coating to automobile bodies, etc., a matte paint containing a conventional paint with a fine inorganic powder or a fine organic powder matting agent dispersed therein is used. In case,
In addition to the settling of the matting agent, it is necessary to install special piping for matting paint in the painting booth, which causes problems such as the performance of the matting paint tends to vary and equipment costs increase.

[Means for Solving the Problems] The present invention provides a dry-on-wet coating of melamine acrylic or non-aqueous dispersion on an electrodeposited coating or intermediate coating formed on an object to be coated. The present invention relates to a matte coating method characterized in that after applying an acrylic clear paint, a solvent-type glossy colored paint is applied by a jet-on-wet method, and then baked and dried.

[Example] The melamine acrylic or non-aqueous dispersion type acrylic clear paint used in the present invention is not particularly limited, and is a commonly used thermosetting acrylic paint with a resin solid content concentration of 30 to 30. If it can be used within the range of 50% by weight, it can be used. At that time, conventional colorants and other paint additives may be mixed and used as long as the properties as a clear paint are maintained.

The solvent-based glossy colored paint used in the present invention is not particularly limited, and may be a solvent-based glossy colored paint that forms a coating film through a thermosetting reaction, such as commonly used melamine alkyd paints or melamine acrylic paints. It can be used as long as possible. Usually black paint is used, but other colors may be used.

Next, the coating method of the present invention will be explained.

After completion of electrodeposition coating on the object to be coated using a conventional method, and further intermediate coating if necessary, the above-mentioned clear coating is sprayed using a dry-on-wet method to achieve a film thickness of 1 after baking and drying.
5~30J! Painted to about m. After that, a wet-on-wet solvent-based glossy colored paint is applied by spraying to a film thickness of 15 to 30AlI1 after baking and drying.
It is applied to about 1 degree, and then heated at 130 to 160℃ for 15 to 10 minutes.
By baking and drying for about 30 minutes, a matte coating film can be obtained by the method of the present invention.

The thus obtained matte coating film has a good appearance and has a gloss that is approximately 25 to 40% lower than that obtained when the clear coating is not used. Furthermore, when painting is performed using a paint booth, the clear paint and the solvent-based glossy colored paint can be applied in the same paint booth. Furthermore, when the coating booth has piping for solvent-based glossy paint and clear paint, there is an advantage that there is no need to provide piping for matte paint.

Examples of the objects to be coated to which the method of the present invention is applied include automobile bodies, automobile exterior parts, household electrical appliances, and agricultural implements.

In particular, it is advantageously applied to blackout painting of automobile bodies and matte painting of black parts in two-tone painting.

Next, the method of the present invention will be explained based on examples.

Examples 1 to 4 and Comparative Examples 1 to 2 A coating film of epoxy-based cationic electrodeposition paint (Electron series manufactured by Kansai Paint ■) was formed on a steel plate, and the coating was heated at 170°C for 2 hours.
After drying for 0 minutes, a melamine alkyd intermediate coating (manufactured by Kansai Paint Co., Ltd.) was applied and dried at 140°C for 20 minutes.

After that, apply melamine acrylic clear for 2CIB (manufactured by Kansai Paint) so that the film thickness after drying is 10μm and 25μm1, respectively, and apply wet-on-wet melamine alkyd topcoat to the film thickness after drying. The coating was applied to a coating thickness of 20 to 30 ml and dried at 140° C. for 20 minutes.

As shown in Table 1, 60″ specular gloss is 23-38%,
A further decrease in gloss was observed by visual inspection, and the goblin adhesion was also good.

[Margins below] [Effects of the Invention] When matte coating is performed by the method of the present invention, no matting agent is used, so there is no problem of settling of the matting agent, and the performance of the matte coating is less likely to vary. Furthermore, there is no need to provide dedicated piping for matte paint, reducing equipment costs.

Claims (1)

[Claims] 1 After applying a clear paint based on acrylic resin on the electrodeposited film or intermediate coat formed on the object to be coated, a solvent-based glossy colored paint is applied wet-on-wet. A matte coating method characterized by baking and drying.