JPS59113200A - Formation of colored pattern to aluminum or aluminum alloy - Google Patents

Abstract

PURPOSE:To pattern easily the entire surface of a treating material having an intricate shape by forming a chemical film, etc. on an Al alloy then dipping the same into a paint bath tank suspended therein with a paint in a multiline shape or wave pattern thereby forming a woodgrain-like colored pattern thereon. CONSTITUTION:A chemical film, anodized film and colored oxidized film are formed by a conventional method on Al or an Al alloy. A paint is added on the surface of the water flowing in a fixed direction from one side in a bath tank and is suspended in a multiline shape or wave pattern. The Al or Al alloy formed thereon with the films is dipped in the paint bath tank so that the woodgrain-like colored pattern is struck thereon. An acrylic resin, etc. are used for the paint. The alloy is then pulled from the bath tank and the paint sticking loosely again thereon during the pulling is rinsed away, and after the surface is subjected to finish painting by an acrylic resin, etc., the surface is baked and dried. The colored pattern is thus formed without using any dye or pigment.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for forming colored patterns on the surface of aluminum or aluminum alloys without using dyes or pigments. Specifically, after forming a chemical film, anodic oxide film, or colored oxide film on aluminum or aluminum alloy by a conventional method, this is immersed in a paint bath in which paint is suspended in a multi-line or ripple pattern to form a wood grain pattern. This invention relates to a method of forming a colored pattern by painting.

Conventionally, the method of applying a colored pattern on aluminum is to apply or print a resist film on the aluminum material according to the pattern, form a barrier type film through a first anodization treatment, remove the resist film, and then perform anodization. A method of generating a colored film through processing to reveal a pattern, i.e. pattern printing → primary anodizing treatment → (M hole) → resist (3) film removal → secondary anodizing treatment (electronic M coloring), or pattern printing →Chemical film treatment→Resist film removal→Chemical conversion treatment (generation of chemically colored film)
No. 95, JP-A-50-41735 or JP-A-50-
It is known from No. 4616. Similarly, as a method that requires a printing process for patterning, the desired pattern is further applied to the TFS coating film by screen printing or offset printing, and then the above-mentioned T P'S coating film and For patterning, ink was dried and baked at the same time.
The method of No. 1-21022 is known. However, with these methods, it is difficult to create patterns without using printing methods, and when patterns are created using printing methods, printing requires a lot of time and expense, which poses problems in terms of mass production or productivity. However, there are other methods that do not rely on printing methods to create patterns, which have the disadvantage that only a uniform pattern can be created and it is difficult to change a wide variety of patterns.

A wood grain pattern is formed by p-electrolysis using alternating current or a waveform with a similar effect (4) in an alkaline electrolytic negative bath plus a barrier-type film-forming electrolyte.

JP-A No. F$52-60244 is known as a method for electrolytic coloring, and JP-A No. IIfl (52-3535) is a method for producing patterns by electrolytic coloring after anodizing treatment and adjusting the barrier layer by electrolysis. Issue 1% Kaisho 5
No. 2-61139% JP 52-70'? No. 51 is known. However, the method of changing the thickness of the barrier layer and then forming a colored pattern by electrolytic coloring cannot be applied to shapes with complex shapes, and it is difficult to adjust the barrier layer, resulting in reduced productivity. There is a problem with this. On the other hand, the method of JP-A No. 52-60244 can be applied to shapes with complex shapes, but the pattern is an engraved pattern with short vertical stripes, similar to a straight-grained pattern. However, it is not close to natural straight grain.

Also, a plate-like pattern cannot be formed.

In view of the above-mentioned points, the present invention aims to provide a method that can easily pattern even complex-shaped shapes and easily pattern patterns that closely resemble the straight-grained and board-grained shapes of natural wood. The method of the present invention is characterized in that the above-mentioned patterning is carried out by a dip coating method. 1. Aluminum or aluminum alloy (hereinafter sometimes referred to as treated material)
Degrease and wash with water according to the usual method.

Processes such as drying and etching as required.

After removing smut, etc., a chemical film, an anodic oxide film, or a colored oxide film using an organic acid is formed. The aluminum with an oxide film formed in this way is dried, and then immersed in a paint bath in which the paint is suspended in a multi-line or ripple pattern by the force of flowing water, as will be explained in detail later, to create a wood grain pattern. let At this time, if the paint is immersed in a paint bath in which the paint is floating in a multi-line pattern, a straight-grained pattern will be formed, and if it is rippled, a board-like pattern will be formed. Then,
Spray or soak dry or as is.
When the surface finish is applied by painting and baking is performed by drying, it is preferable to use the dip coating method for the patterned surface finishing after painting, as well as for patterned painting.

Another method of the present invention is to carry out electrolytic coloring in an electrolytic bath containing an inorganic gold pA salt in accordance with a conventional method, or to form a colored oxide film with an organic acid, after carrying out the above-mentioned preliminary treatment.

Thereafter, a grain-like pattern is applied by dip coating in the same manner as in the above method, and partially masked, followed by noble electrolytic coloring or electrolytic coloring. Then, the surface finish is painted as is, or the above-mentioned patterned surface is coated after the coating is peeled off.

If the patterning involves peeling off the paint film, the subsequent surface finishing can be done by spraying or dipping, or by Dento 1 Diagnostics.

To explain the patterned painting process, the first method is to pour paint from several places in a multi-line pattern from one side of a bathtub filled with flowing water. Stop the flow of water and the paint before it overflows into the overflow gutter provided on the opposite side of the mouth, and suspend the treated material vertically and soak it in the water to adhere the paint in the shape of the wood grain (7). As for the processing conditions, it is preferable that the material to be treated is dry and that it is treated in a vertically suspended tank, and the bathtub has a liquid surface width (tank width) that is 1/2 to 2/3 of the length of the material to be treated. It is preferable to use If the tank width is not sufficient, a method is adopted in which the flow rate of the paint is adjusted so that a thin, wood-grain-like line is created continuously depending on the dipping speed of the treated material.

If the pattern is painted in this way.

A straight-grained pattern is formed.

In addition, when creating a plate-like pattern, paint is dripped onto the water surface in a flowing state to create ripples, and the paint layer is supplied in a ripple pattern in accordance with the dipping speed of the treated material.

In the method described above, as the treated material is immersed, paint floating on the water surface adheres to the surface of the treated material in a grain pattern starting from the lower end.

Water is used as the liquid to suspend the paint, and adding a surfactant to it improves workability. Furthermore, when pulling up the treated material, the treated material must be in a wet state (8), and any paint that has loosely adhered (re-deposited) at that time can be easily removed by air agitation or the like in a washing tank. It is effective to add a small amount of surfactant to the washing tank.

Paints used for patterning include acrylic resins, such as modified acrylic lacquers (acrylic resin/nitrocellulose), alkyd resins, such as high solid lacquers (benzoic acid-modified alkyd resins/nitrocellulose), etc. By adding various pigments to these paints, various patterns and colors can be obtained. Please note that when applying paint while soaking the treated material, if the pattern breaks during the process, you will not be able to obtain a beautiful pattern.
In some cases, it is preferable to add a small amount of microfilm to reinforce the paint layer.

The paint used for the surface finish is acrylic resin.

Paints such as alkyd resins, amine resins, urethane resins, and silicone resins can be used.

As described above, in the present invention, the patterning is done by dip coating, so even if the treated material has a complicated shape, it can be easily patterned on the entire surface by hanging it vertically. In addition to being incorporated into silver and amber colors.

Based on a colored film such as bronze or gold color, various types of patterns can be changed by appropriately selecting the pigments to be included in the paint for the patterned paint. In addition, paint is added to the water surface flowing in a certain direction from one side of the bathtub, and the paint is carried by the force of the flowing water to form a predetermined wood grain pattern on the water surface, making it easy to create a stable desired pattern. A pattern form can be obtained. Furthermore, because the paint is attached to the treated material while it is floating on the water surface, it is not possible to obtain a uniformly colored pattern, but rather a colored pattern that is similar but not exactly the same is obtained using the present invention. %
This is one of the signs. Furthermore, after applying a colored pattern, a clear coating is applied as a surface finish, resulting in a coating film with excellent weather resistance and wear resistance.

There is no problem in using the article coated in this way for exterior purposes.

Next, the present invention will be explained and explained in more detail by showing examples.

Example 1 Length 2 degreased, etched, and smut removed by conventional methods
0 cIn, width 7 crn aluminum extrusion profile, (-6
063,S is oxidized with 17.5 w/v% sulfuric acid, washed with water, and then dried. Next, on the water surface that flows slowly in a certain direction, a modified acrylic lacquer (acrylic resin/nitrocellulose) enamel (blank) diluted with thinner in an Iwata (IH8) cup for 11 seconds is applied.
Pour the paint into thin lines in the direction of the waves from five locations, stop the flow of water and the paint just before it overflows, and slowly immerse the above-mentioned shape so that the paint adheres to the shape in a wood grain pattern. . This was then pulled up, washed with water, air-dried, coated with acrylic clear paint, and baked at 180°C for 30 minutes to dry. In this way.

A black wood grain pattern was formed on the silver anodic oxide film.

Example 2 After anodizing and washing with water in the same manner as in Example 1, alternating current electrolysis was carried out at 15 V for 2 minutes with carbon as a counter electrode using the following electrolyte composition to electrolytically color the product bronze-colored. This was washed with water and dried. The subsequent patterning and clear coating were carried out in the same manner as in Example 1, and a black wood grain pattern was formed on the pale bronze colored film.

Electrolyte composition: Nickel sulfate (hexahydrate) 30g/
7 Magnesium sulfate (7 water 1st product) +511/ Boric acid 20 g/7 Ammonium borate 3011/1 Sodium dithionite 0.5'/l pH 5,6 Liquid Temperature 20°C Example 3 Anodic oxidation in the same manner as Example 1 After processing and washing with water, the following! Using the solution composition, alternating current electrolysis was carried out at 15 V for 6 minutes using carbon as a counter electrode, and the electrolyte (11) was colored gold. This was washed with water and then dried. The subsequent patterning and clear coating were carried out in the same manner as in Example 1, and a black wood grain pattern was formed on the gold colored film.

Electrolyte composition: Sodium selenite 2 El/sulfur
Acid 10Jil/liquid temperature
20°C Example 4 After anodizing in the same manner as in Example 1 and washing with water.

With the following electrolyte composition, 2 at 15r with carbon as the counter electrode.
It was dissolved in alternating current for a minute and electrolytically colored to a bronze color. This was washed with water and then dried. Next.

Iwata C11l, on the water surface that flows gently in a certain direction.
5) Pour modified acrylic lacquer (acrylic resin/nitrocellulose) clear paint diluted with thinner in a cup for 11 seconds in 5 places in the flow direction in a thin line, and just before it overflows, water flows Then, stop pouring the paint and slowly immerse the above-mentioned shape to make the paint adhere to the shape in a wood grain pattern. Then (12) pull it out, wash it with water, let it dry naturally, and give it another +8
After performing alternating current electrolytic coloring with V for 3 minutes, washing with water, dip painting with acrylic clear paint, baking and drying at 180°C for 30 minutes. In this way, a wood grain pattern was formed in which the areas where the wood grain pattern was painted were light and the other areas were dark bronze.

Electrolyte composition: Nickel sulfate (hexahydrate) 30. !
7/ is magnesium sulfate (heptahydrate) Ii/heptaboric acid 201//1 ammonium sulfate 3011/ is cobalt sulfate (heptahydrate)
25g/l pH5,6 Liquid Temperature 20℃Example 5 In Example 1, instead of anodizing with sulfuric acid electrolyte, 100.977 sulfosalicylic acid, 5i7t
2A with a mixed electrolyte of sulfuric acid and an aluminum cathode as a counter electrode.
Direct current electrolysis was performed at a current density of /M for 30 minutes to electrolytically develop a pale amber color, followed by washing with water and drying. The subsequent patterning and clear coating were carried out in the same manner as in Example I, and a black wood grain pattern was formed on the pale amber colored film.

Example 6 In Example 1, instead of pouring the patterned paint, a high solid lacquer (benzoic acid modified alkyd resin/nitrocellulose) enamel (black) paint was applied so that the outermost diameter of the ripples was about 3 mm. The shape was then gently dipped in the center of the drop, and the paint was applied in a grain pattern.

The subsequent treatments were carried out in the same manner as in Example 1, and a black woodgrain pattern with fine grain and rich curves was formed.

Example 7 After anodizing and washing with water in the same manner as in Example 1, alternating current electrolysis was carried out at 15F for 2 minutes with the following electrolytic solution composition using carbon as a counter electrode, and electrolytically colored amber. He washed it with water and dried it. Next, on the water surface that is gently flowing in a certain direction, apply modified acrylic lacquer (acrylic resin/nitrocellulose) enamel (black) paint diluted with thinner to 11 seconds with an INS cup in the flowing direction. Pour the paint into 5 locations in a thin line, stop the flow of water and the paint just before it overflows, and slowly immerse the shape so that the paint adheres to the shape in a wood grain pattern. Next, this was pulled up, washed with water, air-dried, again subjected to AC electrolytic coloring at 187' for 3 minutes, washed with water, immersed in 98-thiosulfuric acid for 2 minutes to remove the wood grain pattern, washed with water and Washing with pure water (80°C x 10 minutes) was performed. Thereafter, the above-mentioned shape was immersed in an 8% aqueous solution of thermosetting acrylic resin electrodeposition paint to serve as an anode.
S304) was used as a counter electrode and subjected to DC electrolysis at 150V for 2 minutes.
Electrodeposition was carried out, and baking was carried out at 180° C. for 30 minutes to dry. In this way, fC and PJ are painted in a wood grain pattern.
A wood grain pattern was formed in which the T was light and the other parts were dark amber.

Electrolyte composition: stannous sulfate 5E//1 (16) sulfuric acid 10F/nickel sulfate (hexahydrate) 3og/z solution temperature
20℃ Patent Application Hitoyoshi I] Kogyo Co., Ltd. Representative Patent Attorney Masaaki Yonehara Patent Attorney Tadashi Hamamoto (+7) -503

Claims (1)

[Scope of Claims] 1. By adding paint to the water surface flowing in a certain direction from one side of the bathtub, the paint is suspended in a multi-line or ripple pattern, and is coated with a chemical film, anodic oxide film, or Aluminum or its alloy on which a colored oxide film has been formed with an organic acid is immersed in the paint bath to form a wood grain-like colored pattern, and then the aluminum or its alloy is lifted out of the bath and coated on its surface. A method for forming a colored pattern on aluminum or its alloy, characterized in that the loosely reattached paint is washed with water, and the surface is finally painted. 2. By adding paint to the water surface flowing in one direction from one side of the bathtub, the paint is suspended in a multi-linear or ripple pattern, and then electrolytically colored or anodized with an organic acid (electrolysis (1)) using a conventional method.
A color) Aluminum or its alloy that has formed a colored film through treatment is immersed in the paint bath to attach a wood grain-like colored pattern and masked in the wood grain pattern, and then the aluminum or its alloy is pulled out of the bath. Formation of a colored pattern on aluminum or its alloy, characterized by washing the paint loosely re-adhered to the surface during lifting with water, applying electrolytic coloring treatment or electrolytic coloring treatment, and then applying paint to finish the surface. Method. 3. By adding paint to the water surface flowing in a certain direction from one side of the bathtub, the paint is suspended in a multi-linear or ripple pattern, and then treated with TMI color treatment or anodic oxidation (electrolytic coloring) treatment with an organic acid using a conventional method. Aluminum or its alloy on which a colored film has been formed is immersed in the paint bath to attach a wood grain-like colored pattern and masked in the wood grain pattern, and then the aluminum or its alloy is pulled out of the bath and painted on the surface. The loosely redeposited paint is washed with water, and further MS coloring treatment or electrolytic coloring treatment is applied. Method for forming colored patterns on the alloy 0