KR820000332B1 - Method of forming colored patterns on aluminium or its alloys - Google Patents

Abstract

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Description

Method of forming colored pattern of aluminum or its alloys

The present invention relates to a method of forming a colored pattern without using dyes or pigments on the surface of aluminum or its alloys.

In the conventional method of forming a colored pattern on aluminum, a resist film is applied or printed on an aluminum material in a shape, and then a barrier film is formed by a first anodizing process, and the resist film is removed. Next, a method of producing a colored film by anodizing and expressing the shape, that is, shape printing → primary anodic oxidation → (sealing) → resist film removal → secondary anodic oxidation (electrolytic color development) or shape printing → chemical A method of combining the processes of coating treatment → resist film removal → chemical treatment (creation of chemically colored coating) is known in Japanese Patent Application Laid-Open No. 52-3895, Japanese Patent Laid-Open No. 50-41735, or Japanese Patent Application No. 50-4616. Similarly, as a method requiring a printing process for attaching the shape, a desired shape is attached by screen printing or screen printing by off-separation again on the TFS coating film, and then again drying and baking the TFS coating film and the shape applying ink at the same time. The method of the special command 51-21022 of baking is known. However, with these methods, shape attachment is difficult without the printing method, and when the shape is attached by the printing method, a lot of time and expense are required for printing, and it is a problem in terms of productivity or productivity. There is a flaw that can not only make a uniform shape and various shapes.

As a method of not printing the shape by printing, it is delivered by alternating current or by such a waveform in a bath in which a barrier-type film-forming electrolyte is applied to an alkaline electrolyte bath, and forms a wood grain. Patent No. 52-60244 is known as a method of electrolytic coloring, and the method of forming a shape by the following electrolytic coloring by adjusting the barrier layer by electrolysis after anodizing treatment is disclosed in Japanese Patent Application Laid-Open No. 52-3535, Japanese Patent Application No. 52-61139. Japanese Patent Application Laid-Open No. 52-70951 is known.

However, the method of forming a coloring pattern by electrolytic coloring after changing the thickness of a barrier layer is difficult to apply to a complicated shape shape, or it is difficult to adjust a barrier layer, and there exists a problem in productivity. On the other hand, the method of JP 52-60244 is also applied to a complicated shape, but the shape obtained by this method is an etched shape, which is a short longitudinal stripe shape, similar to a straight grain of wood, but close to natural shape. No wave shape is formed.

In view of the above, it is an object of the present invention to provide a method of easily attaching a shape to a complex shape, and to simplify the attachment of a shape similar to a straight grain of wood and a wave of natural wood. It is characterized by facilitating attachment of the shape by masking with a coating film, and furthermore, it is possible to express a three-dimensional tube by etching etching after the masking.

Referring to the method of the present invention, first, degreasing, washing with water, drying, etc. are carried out in the usual manner of aluminum or an aluminum alloy (hereinafter referred to as a treatment material), and etching, smut removal, etc., if necessary Then, the paint is immersed in a paint bath suspended in a multi-line or rippled shape, and the shape is attached with wood grains. At this time, when the paint is immersed in the paint bath, which is floating in a multi-linear form, a straight wood grain is formed, and when the paint is rippled, a wavy shape is formed. The treated material is then taken out of the paint bath and dried using natural drying or a suitable heater to form a wood grain coating. When the processing material is taken out, the processing material is in a wet state, and the coating material adhered (reattached) at that time is easily removed by air stirring or the like in a washing tank. It is more effective to add a small amount of the surfactant to the washing tank. When the water washing process is omitted, the paint on the liquid surface is overflowed, and the paint layer is removed and then taken out.

In this way, the treatment material is masked with a wood grain coating film, optionally washed with water, and subjected to surface treatment in the next step. This surface adjustment treatment is intended to show a difference in the film quality between the masking portion and the exposed portion in the following anodic oxidation treatment. A film such as a barrier-type film by applying a high voltage or a colored oxide film by anodizing in an organic acid electrolytic bath is formed. Then, the masking coating film is removed with a solvent, sulfuric acid, organic release agent, or the like, washed with water and dried as necessary, and then a colored oxide film is formed by anodizing for normal organic acid electrolysis, or anodizing. Then, electrolytic coloring is carried out in an electrolytic bath containing a metal salt.

According to another method of the present invention, a wood-like coating film is masked on the treatment material as in the electric method, and then referred to as a surface adjustment treatment. By this etching process, the thing of the three-dimensional tube of the texture and unevenness which processed almost natural wood as a finished product is produced. Subsequent processing is carried out in the same manner as the electric method.

The masking treatment by the electric shape coating is performed by flowing paint from several places in a multi-line in one bathtub containing flowing water, flowing the paint in a floating state, and flowing the water into the overflow barrel on the opposite side of the inlet. Prevent the inflow of paint, immerse the processing material vertically, and attach the paint with wood grain. As the processing conditions, it is preferable to dry the treatment material and to hang it vertically, and to use a bath having a liquid width (rough width) of 1/2 to 2/3 relative to the length of the treatment material. If sufficient width cannot be obtained, a method of pouring the material while adjusting the flow rate of the paint is adopted so that a thin line is continuously formed with respect to the immersion speed of the treatment material. In addition, a method of supplying paint to the opposite side of the tub after the tub is collected, and using a jig provided with recesses at arbitrary intervals, can be used to float the paint in a multi-line by dragging it to the tub afterwards. have. In this way, when the shape-coating is applied, a thin straight wood grain shape is formed.

In case of attaching other wave shape, paint is applied on the surface of water and ripples are generated. Water is used as the liquid to float the paint, but adding a surfactant therein improves workability.

As the coating material for the shape, acrylic crab resin, for example, modified acrylic lacquer (acrylic resin / nitrocellulose), alkyd counting paint, for example, high solid lacquer (benzoic acid modified alkyd resin / nitrocellulose) This is good, but it is not limited to these. In addition, when the coating material is immersed in the process material when immersed, if the shape is cut off in the middle, it is not possible to form a beautiful shape.

As described above, in the present invention, the coating with a shape is performed by an immersion coating method, so that even a complicated processing material can be easily attached to the front surface by being vertically hung and processed into a longitudinal hanging alumiteline. It can be attached in many shades of blue, amber, amber, silver, and gold by the surface adjustment treatment and the following electrolytic coloration and electrolytic coloring method, and the coloring is excellent in weather resistance and corrosion resistance currently used for building exterior materials. It is a method, and even long-term use does not cause hadong trouble. It is also one of the features of the present invention that a uniform colored pattern cannot be made and an approximate but not exactly identical pattern can be obtained because the coating material is attached to the treatment material while floating on the liquid surface.

In the present invention, after forming a colored pattern, the surface of the composite film can be further improved by spray coating, immersion coating, electrodeposition coating, etc., to further improve corrosion resistance and weather resistance.

Next, an Example is given and this invention is demonstrated in detail.

Example 1

The aluminum extruded shape member A-6063S having a length of 20 cm and a width of 7 cm was degreased, etched, and smut removed by a conventional method. Just before flowing over and overflowing the modified acrylic lacquer (acrylic resin / nitrocellulose) enamel paint diluted in 11 seconds with an IHS cup with thinner on the surface of the water flowing slowly in a certain direction. The flow of water and the flow of paint are stopped and the mold is slowly immersed and the paint is attached to the mold in the form of wood grain. Next, this was taken out and dried at 100 degreeC for 10 minutes. This was immersed in 20 g / l boric acid, 1 g / l caustic soda and 20 ° C. solution, and energized with a ^{2 A} / dm ² current density for 40 seconds between the counter electrode stainless steel (SUS 304) to produce and adjust a barrier film. The coating film masked in shape with the organic peeling agent Saprotite P-19 was peeled off, washed with water, and then immersed in 17.5 W / V sulfuric acid electrolyte to make a positive electrode and 1.2 A / dm between the aluminum negative electrode made of counter electrode. DC current was applied for 35 minutes at a current density of ^{2 to form} an anodized film.

Subsequently, after 3 minutes of alternating electrolysis at 18V between carbon of counter electrode with the following electrolyte composition after washing with water, the part which was masked by surface adjustment became dark, and the other part produced the light bronze-colored wood grain shape.

Electrolyte composition: Nickel sulfate (hexahydrate) 30g / l

Magnesium Sulfate (7-hydrate) 15g / l

Boric acid 20 g / l

Ammonium Sulfate 30g / l

0.5 g / l sodium citrate

pH 5.6 /

Liquid temperature 20 ℃

Example 2

Instead of surface adjustment by barrier film electrolysis by boric acid-caustic soda in Example 1, electrolysis was carried out for 1 minute under a DC voltage of 23 V between an aluminum cathode made of counter electrode with an electrolyte solution of 15 g / l sulfuric acid and a liquid temperature of 20 ° C. After making surface adjustment, peel off the coating film masked in shape with release agent Saprotite P-19, wash with water, and immerse in 17.5W / V% sulfuric acid electrolytic solution to make positive electrode, and make it into 21V between aluminum cathode made of counter electrode. After energizing for 20 seconds, anodized for 35 minutes at a current density of 1.2 A / dm ^{2 at} a direct current. This subsequent treatment was carried out in the same manner as in Example 1, whereby the portion that was masked by the surface adjustment was conveyed, and the other portions had a light bronze grain of wood.

Example 3

As in Example 1, a wood grain-coated film was formed and a masking film was formed. Then, the exposed portion was etched for 3 minutes with a 70 g / l caustic solution at 60 ° C., resulting in unevenness and a difference in metallic luster. When the treatment was carried out, in addition to the finish appearance produced in Example 1, a three-dimensional texture of wood grains was added.

Example 4

The surface was adjusted and the masking film was peeled off as in Example 1, after which the electrolyte solution of 100 g / l sulfo-salicylic acid and 5 g / l sulfuric acid was brought to a liquid temperature of 20 ° C. Anodizing for 35 minutes at a current density of 2 A / dm ² resulted in dark, dark areas of amber masking and wood grains.

Example 5

It was the same as Example 3 until surface adjustment was carried out, and the masking film was peeled off, and after that, the same process as Example 4 was carried out, and in addition to the finishing appearance obtained in Example 4, a feeling of condensation occurred in a wood grain shape.

Example 6

In Example 2, except that 20 g / l oxalic acid and an electrolyte solution having a liquid temperature of 20 ° C. were used instead of the surface adjustment by 15 g / l sulfuric acid and a liquid temperature of 20 ° C., the same parts were masked by surface adjustment. The part has a light bronze grain of wood.

Claims (1)

In order to form a masking coating film on a surface of an aluminum product, the product is immersed in a coating bath containing an acrylic or alkyd resin resin floating in a polymorphic or polycyclic shape, and then deeply etching the unmasked coating layer. Aluminum or an alloy consisting of a step of applying an alkaline solution to the surface for surface adjustment treatment, removing the masking coating film, and then electrolytic coloring the surface having the etched surface and the portion subjected to the masking coating treatment. A method of forming a tinted shape on the surface of a product made from.