JP2667347B2 - Method for manufacturing painted metal body - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a coated metal body which is coated on the surface of a metal body having a fine uneven pattern.

[0002]

2. Description of the Related Art In recent years, fine irregularities such as hairlines and embossed surfaces have been used as fences for roads and railings, and as interior and exterior building materials for buildings, taking into account the landscape of cities and houses. Are widely used.

[0003] As the above-mentioned metal body, stainless steel material, steel material whose surface is plated, aluminum material and the like are used in consideration of corrosion resistance. In particular, these metal bodies are used outdoors for the above-mentioned applications. And, dust and the like are likely to adhere to fine uneven patterns such as hairlines and textures formed on the surface of these metal bodies to easily get into a wet state. Rust sometimes occurred on the uneven pattern.

[0004]

In order to solve the above-mentioned problem, a paint made of a transparent acrylic silicone resin, acrylic resin, urethane resin, or the like is applied to the surface of the metal body on which the fine uneven pattern is formed, and the metal is coated. 2. Description of the Related Art It has been practiced to improve the corrosion resistance of a concavo-convex pattern by blocking the contact between a corrosive factor such as dust and acid rain and a metal body while making use of the decorativeness of the body surface. However, a coating film made of a paint such as the above acrylic resin or urethane resin deteriorates with the passage of time, and there is also a problem in stain resistance.

[0005] On the other hand, a coating film made of an acrylic silicone resin paint is used suitably for the above-mentioned applications because it is hardly deteriorated due to aging and has excellent stain resistance. Since the paint was applied in a state of relatively high viscosity such as 1500 to 5000 centipoise, the paint 3 was not filled well in the recesses of the uneven pattern 2 formed on the surface of the metal body 1 as shown in FIG. However, there was a disadvantage that the formed coating film was easily peeled off in a short period of time because it was only adhered to the surface.

[0006] The present invention solves the above-mentioned problems of the conventional method of manufacturing a coated metal body, and improves the corrosion resistance of a fine uneven pattern formed on the surface of the metal body. It does not provide a manufacturing method.

[0007]

In order to achieve the above object, the present invention has the following arrangement. That is, the method for producing a coated metal body according to the present invention is directed to a coated metal formed by coating a coating mainly composed of a silicone compound on the surface of a metal body having a fine uneven pattern formed on at least a part of the surface. A method for producing a body, wherein the viscosity of the paint is 1
The paint applied to the surface of the metal body has a thickness of up to 1000 centipoise and is filled in the concave portions of the uneven pattern of the metal body.

Hereinafter, the configuration of the present invention will be described in more detail.

As the metal body used in the present invention, generally, steel, aluminum, copper, zinc and other metals and their alloys are appropriately used, but stainless steel, galvanized steel and aluminum having excellent corrosion resistance. Etc. are particularly preferably used. Also, the shape of the metal body may be any shape such as a flat plate, a curved plate, a corrugated plate, or a column such as a prism or a cylinder. It may have an irregular cross section.

The fine uneven pattern formed on the surface of the metal body may be a non-decorative one such as a streak generated at the time of molding the metal body, but is generally a fine decoration such as a hairline or a grain. It is an uneven pattern having properties. The concavo-convex pattern may be formed on the entire surface of the metal body, or may be formed partially. In addition, the depth of the concave portion of the concavo-convex pattern may be small, but is preferably large.

The surface of the metal body is preliminarily subjected to a degreasing treatment to remove dirt and oils and to form a phosphate film such as a phosphate film by a chemical conversion treatment in order to improve the adhesion to the paint. Or a known primer layer may be further formed.

[0012] The paint applied to the surface of the metal body contains a silicone compound as a main component, and the silicone compound is appropriately mixed with an antisettling agent, a modifying agent, a solvent and the like to form a paint. It is. As a silicone compound, generally, an organic silicon compound alone or an organic silicon compound having a cycloxane bond as a main chain such as a silicone resin and an alkyd, epoxy, acrylic, polyester,
A sol such as a silicone sol obtained by reaction with a modified organic substance such as phenol, melamine, urethane or the like is suitably used, and the coating material may be a room temperature curing type or a baking type. In general, a baking mold that can shorten the curing time is preferably used.

When the silicone sol is used, an acrylic-modified silicone sol obtained by condensation of an alkylol group, which is a functional group of a thermosetting acrylic resin, with an organosiloxanol or an organosiloxane is combined with a metal body. It has excellent adhesion, weather resistance, and chemical resistance and is preferably used because it is cured by heating.
It is also preferable that the content of the modified organic substance is smaller than that of the organic silicon polymer, because it is excellent in weather resistance and adhesion and the amount of gas generated during combustion is reduced.

The paint containing the silicone compound as a main component may be colored. However, if the paint is transparent, the surface of the metal body can be seen through even if the paint is applied to the surface of the metal body. This is preferable because the aesthetic appearance of the uneven pattern is not impaired.

When a paint containing the above-mentioned silicone compound as a main component is applied to a metal body, the viscosity of the paint is 1 to 10
The reason why the pressure is set to 00 centipoise is that when the viscosity is 1 centipoise or less, it is difficult to form a coating film because the silicone compound is minute, and when the viscosity is 1000 centipoise or more, the viscosity is high, so that the concave and convex portions formed on the surface of the metal body are uneven. Is not filled well. The preferred range of the viscosity is 2 to 100 centipoise.

In order to apply the coating material to the surface of the metal body, known methods such as spray coating, brush coating, and roller coating are applied, and the film thickness obtained by the coating is not particularly limited. It is about 5 to 50 μm.

[0017]

According to the method for producing a coated metal body of the present invention, a paint containing a silicone compound as a main component is applied to the surface of the metal body,
This is a method for producing a coated metal body having excellent corrosion resistance and stain resistance due to excellent water repellency, weather resistance, chemical resistance and the like of a silicone compound which is a main component of the coating. When applying on the surface of the paint, the viscosity of the paint is 1
The viscosity of the metal body is low, such as ~ 1000 centipoise, and the paint coated on the surface of the metal body is filled in the recesses of the uneven pattern of the metal body. A coated metal body that is firmly adhered and has excellent corrosion resistance and stain resistance at the uneven pattern portion can be obtained.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below based on embodiments. FIG. 1 is an explanatory sectional view showing one embodiment of a coated metal body manufactured by the method for manufacturing a coated metal body of the present invention.

First, as shown in FIG. 1, the surface of a metal body 1 made of a stainless steel plate (SUS304) having an uneven pattern 2 formed by a hairline with a roughness of 400 on the surface is degreased and washed with water. 5 centipoise (20
The present invention in which a baking-curable coating material 3 (Super Cera TS-401 manufactured by Daihachi Chemical Co., Ltd.) containing a silicone compound as a main component is applied, and the coating material is solidified to form a 15-20 μm coating film. A coated metal body according to Example 1 was obtained.

Further, the surface of a metal body 1 made of an aluminum plate having an uneven pattern 2 formed by a hairline having a roughness of # 400 on the surface is degreased and washed with water.
After applying a room temperature-curable coating material 3 (Ceraprotex manufactured by Tonen Co.) containing a silicone compound as a main component at 00 centipoise (20 ° C.), the coating material is solidified to form a coating film of 10 to 15 μm. A coated metal body according to Example 2 was obtained.

Next, as a comparative example, the surface of a metal body made of an aluminum plate similar to that of the above-mentioned Example 2 was given a viscosity of 3000.
After applying a bake-hardening paint (manufactured by Natco Paint Co., Ltd.) mainly composed of an acrylic silicone compound having a centipoise (20 ° C.) and a high viscosity, the paint is solidified to 15 to 2
A coated metal body having a 0 μm coating film was obtained.

Next, with respect to the coated metal bodies according to Examples 1 and 2 and Comparative Example, a cross cut tape peel test, a cross cut tape peel test after a boiling test, and a salt water spray test were performed to examine corrosion resistance. The results are shown in Table 1.

The cross-cut tape peeling test was performed by cutting 1 mm ×
This is a test to investigate the number of squares remaining without peeling when making 100 squares of 1 mm square and sticking a cellophane adhesive tape on the squares and forcibly peeling off the tape. The cross-cut tape peeling test is a test in which the cross-cut tape peeling test is performed after boiling for 10 hours. In Table 1, 100 pieces, which is the original number of squares, are used as the denominator, and all the pieces remain without peeling. The number of eyes is indicated by a numerator.

In the salt spray test, two diagonal lines intersecting each other by a cut which penetrates the coating film of the test piece with a sharp knife and reaches the surface of the metal body, are drawn, and the test piece is subjected to a test in which a salt water mist is generated. The test was conducted for 1000 hours, and the size of blisters formed on the coating film was examined to evaluate the adhesion between the coating film and the metal body. This is a salt spray test. X indicates that occurrence of rust and blistering was observed.

[0025]

[Table 1]

As shown in Table 1, the coated metal bodies according to Examples 1 and 2 of the present invention can be seen in the results of the cross-cut tape peel test, the cross-cut tape peel test after the boiling test, and the salt spray test as compared with the comparative example. Thus, it was found that the adhesion between the coating film and the metal body was excellent.

[0027]

As described above in detail, according to the method for producing a coated metal body of the present invention, a paint containing a silicone compound as a main component is applied to the surface of the metal body, and the silicone compound as a main component of the paint has excellent properties. This is a method of producing a coated metal body having excellent corrosion resistance and stain resistance due to water repellency, weather resistance, chemical resistance, etc., and when the paint is applied to the surface of the metal body, the viscosity of the paint is 1%. It is made low-viscosity, such as ~ 1000 centipoise, and the paint coated on the surface of the metal body is filled into the concave portions of the uneven pattern of the metal body. Attached to
A coated metal body having excellent corrosion resistance and stain resistance of the uneven pattern portion can be obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional explanatory view showing one embodiment of a coated metal body manufactured by the method for manufacturing a coated metal body of the present invention.

FIG. 2 is an explanatory cross-sectional view showing a coated metal body manufactured by a conventional method for manufacturing a coated metal body.

[Explanation of symbols] 1 metal body 2 uneven pattern 3 paint

Claims (1)

(57) [Claims] 1. A method for producing a coated metal body comprising a metal body having a fine uneven pattern formed on at least a part of a surface thereof, and a paint containing a silicone compound as a main component applied to the surface. A method for producing a coated metal body, characterized in that the viscosity of the coating is 1 to 1000 centipoise, and the coating applied on the surface of the metal body is filled in the concave portions of the metal pattern.