JPS6223070B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a copper plate for roofing.

The copper sheets on the roof oxidize in the atmosphere and develop a patina, creating a beautiful roof. However, at first it only turns black, and it takes more than 10 years for it to develop a patina.

It is also possible to artificially generate patina on the copper plate using a patina-generating liquid such as ammonium chloride, but the patina thus generated easily peels off or stains hands. Particularly necessary for roofing construction,
This is noticeable in the work of folding copper plates.

Therefore, the present inventors have previously developed a method for producing an artificial patina copper plate in which a patina is artificially generated on a copper plate and the generated patina does not peel off even when folded (Japanese Patent Publication No. 57-52425).

The method for manufacturing the artificial patina copper plate developed above is to coat the surface of the copper plate with a mixture of copper powder or copper alloy powder mixed with a water-soluble adhesive, dry it, and then apply a water-soluble coloring liquid that acts on the copper to generate patina. is sprayed to form a transparent water-resistant protective film on the surface of the artificial patina, and even if the resulting artificial patina is folded, the patina will not peel off, and the artificial patina will not peel off. The patina layer and the protective film layer on the surface will peel off in 2 to 3 years, but at that time, the patina will develop on the copper plate itself and grow stubbornly, so by the time the artificial patina layer has disappeared, the real patina will have disappeared. It has been changed to a copper plate.

The artificial green bronze plate developed above has been adopted for the copper roofs of about 30 public buildings, including the Kobe Museum, Tokuyama Cultural Hall, and Chofu Art Museum, and has been well received and is becoming popular nationwide.

However, during roofing work using this artificial patina copper sheet this winter, a complaint arose that the artificial patina layer peeled off at the part where the artificial patina sheet was folded.

As a result of on-site investigation and testing of the phenomenon of patina layer peeling, it was found that this phenomenon was caused by freezing caused by abnormally cold waves.

With the artificial patina copper plates developed above, the artificial patina layer had replaced the real patina after one summer had passed since the roofing work was completed, and problems such as peeling did not occur, but during winter factory production. If you use artificial patina copper plates with a shallow manufacturing date and immediately perform winter construction,
Because the patina coloring liquid sprayed on the copper plate is water-soluble, it absorbs moisture from rain and snow during the day, freezes when the air drops below freezing at night, and becomes wrinkled and crusty, causing problems when construction workers step on the copper plate. If you do so, that part will peel off.

This invention solves the above-mentioned problems of the developed artificial green bronze plate, and its purpose is to use the artificial green bronze plate with a shallow manufacturing date to immediately roof in the winter and freeze it. An object of the present invention is to provide a method for manufacturing an artificial patina copper plate without the risk of peeling of the artificial patina layer even if the artificial patina layer is peeled off.

The details of the method for manufacturing the artificial patina copper plate of the present invention will be explained below based on Examples.

1st Step Since a film layer made of a rust preventive agent is formed on the surface of a copper plate produced in a factory, this film layer is removed and the surface is subjected to oxidation treatment.

To remove the rust preventive film layer and oxidize the surface, heat a mixture of 3% potassium sulfide aqueous solution and 2% ammonium chloride to approximately 40 to 50°C and rub it on the copper plate using a nylon scrubbing brush. Ru.

Through this treatment, the film layer of the rust preventive agent can be removed, and the surface becomes oxidized copper (copper oxide) in 1 to 3 minutes.
Therefore, it has the property of easily reacting with atmospheric components.

In FIG. 1 of the accompanying drawings, reference numeral 1 indicates a copper plate, and reference numeral 2 indicates a copper oxide layer formed on the surface thereof by surface oxidation treatment.

Second step: Spray a paint containing basic copper carbonate powder as a main component onto the surface of the oxidized copper plate. The composition of this paint is 15 parts by weight of basic copper carbonate powder and 15 parts by weight of Clear Lacquer 85.The paint is sprayed in a coarse manner so that the surface of the copper plate can be seen between the particles attached by the spray.

In FIG. 1, numerals 3 are particles attached to the copper plate 1 (the surface of the copper oxide layer 2 on the surface) by spraying the basic copper carbonate paint.

The clear lacquer is preferably an acrylic lacquer (in particular, Inclarac manufactured by Toa Paint Co., Ltd. through a technical partnership with Inclarac Inc. of the United States).

Also, spray guns with a diameter of 0.8 mm have been tested and have shown good results.

When the above paint is sprayed (roughly so that the particles can be seen as dots), a product that looks so similar to real patina is created.

However, the complete patina on the surface of the copper plate must be generated from the copper plate itself, regardless of the manufacturing method, so a third process is performed.

Third step: Apply an artificial patina generation liquid to the surface of the copper plate obtained in the second step.

Composition of artificial patina generation liquid Copper sulfate 100g per water 100g Ammonia chloride 50g Acetic acid 10g Salt 10g When the above artificial patina generation liquid was applied, this liquid was formed by the basic copper carbonate paint sprayed in the second step. , adheres to and reacts with the oxidized copper (copper oxide layer) exposed in the gaps between the large number of particles 3 in FIG.

In FIG. 2, numerals 4 denote particles formed by applying an artificial patina-generating solution, which adhere to the copper oxide layer 2 in the gaps between the particles 3.

This invention is as described above, and the manufacturing method of this artificial green bronze plate includes a first step of rubbing a mixed aqueous solution of potassium sulfide and ammonium chloride on the surface of the copper plate to form a layer of copper oxide on the surface; In the second step, a clear lacquer mainly composed of basic copper carbonate powder is scattered and sprayed on the surface of the obtained copper plate.
The process consists of a first step and a third step of applying an artificial patina generating solution containing copper sulfate and ammonia chloride as main components. The basic copper carbonate particles (3 in the figure) that were sprayed in the second step are covered with clear lacquer and do not absorb moisture from rain or snow. Even if there is rain or snow in the interior and it freezes at night, this layer will not peel off and will maintain its patina, preventing the peeling phenomenon that occurs during freezing as in the past (artificial patina bronze plate developed above). This has the effect of not causing any complaints.

In addition, the particles of the artificial patina generation liquid (4 in the figure) that adhered to the oxidized copper surface (copper oxide surface) in the third step are sandwiched between the basic copper carbonate particles (3 in the figure), so this is also true. There is no risk of it falling off, and the patina that has formed on the oxidized copper surface strengthens its reaction with components in the atmosphere by the patina-generating liquid, and grows into a strong patina 5 as shown in Figure 3. As the patina grows and spreads, the clear lacquer, which is mainly composed of basic copper carbonate, has relatively weak adhesion, so it lifts up and gradually peels off, creating a completely authentic patina. It has the effect of changing.

[Brief explanation of the drawing]

The drawings show an example of the method for manufacturing an artificial patina bronze plate for roofs according to the present invention, and FIG. 1 is an enlarged cross-sectional view of a part of the copper plate obtained in the first and second steps;
Fig. 2 is an enlarged cross-sectional view of a portion of the copper plate obtained by adding the third step, and Fig. 3 is a further enlarged cross-sectional view of a portion showing the appearance of genuine patina on the copper plate obtained in the third step. FIG. 1... Copper plate, 2... Oxidized copper (copper oxide) layer,
3... Particles attached by spraying basic copper carbonate paint, 4... Particles attached by applying artificial patina generating solution, 5... Real patina.

Claims (1)

[Claims] 1. A first step in which a mixed aqueous solution of potassium sulfide and ammonia chloride is rubbed on the surface of a copper plate to form a layer of copper oxide, and a clear lacquer whose main component is basic copper carbonate powder is sprinkled and blown. A method for manufacturing artificial patina copper sheets for roofs, characterized by comprising a second step of spraying, and a third step of applying an artificial patina generating liquid containing copper sulfate and ammonia chloride as main components. 2. The method for manufacturing an artificial patina copper plate for roofs according to claim 1, wherein the mixed aqueous solution of potassium sulfide and ammonia chloride in the first step is heated to 40 to 50°C and rubbed.