JPH06102397B2 - Metal decorative plate with excellent stain resistance - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a decorated signboard, display board, sign, guide board,
The present invention relates to a metal decorative plate such as a name plate or a painting.

[Prior Art] Signboards that are intended to be used for the purpose of sending various messages by exposing figures, letters, patterns, etc. (collectively referred to as patterns etc.) to the exterior of the exhibition. , A display board, a sign, a guide board, a name plate, a painting, etc. (hereinafter collectively referred to as a decorative plate). These decorative plates are usually painted with a durable, weather-resistant colored material on the side of the durable material so that it does not lose its effect when exposed to the elements for a considerable period of time. When it is installed in a place similar to indoors for a relatively short period of time, there is also a decorative plate that uses dye on paper, but in general, it is used for sheets of wood, synthetic resin, cloth, metal, etc. Patterns and the like have been drawn on the surface using paints using pigments. In particular, for a decorative plate that needs to transmit a message for a long period of time, a method of coating a metal sheet has been adopted from the viewpoint of durability.

However, wood and cloth are discolored and corroded, and even metal is contaminated and damaged by the rusting of the pattern or the like, which is the main message. Further, even a coating material using a pigment having a relatively high weather resistance is discolored by being exposed to ultraviolet rays or peeled off due to deterioration. As a result, the pattern or the like is changed or polluted, which often makes it impossible to transmit the original message or has an adverse effect. It is clear that the durability of metal sheets is higher than that of other materials, but the adhesion to paint is not always good, and especially in the beach area, patterning occurs in a remarkably short time due to rapid rusting and corrosion. Etc. were sometimes contaminated.

Therefore, in order to prevent changes in durability and pattern, etc., a method of making unevenness on a metal sheet, painting the concave part and covering it with transparent resin (Shokai Sho 61-71478
No.) is proposed.

However, it is extremely difficult to manufacture a pattern with a metal sheet surface to make unevenness, and the cost is high.
It was not possible to apply it widely. Further, since the contrast of patterns and the like may be low only by the unevenness, it is often performed in combination with painting. As described above, the combination with the coating improves the visibility, but does not improve the drawbacks of the coating itself, such as adhesion to metal and weather resistance.

On the other hand, it is not uncommon for various messages to express the texture and cleanliness of metal. However, for such a purpose, even if a metal is used as the material, the characteristic of the metal material disappears by painting.
For this reason, it is conceivable to use stainless steel, but selecting a steel type satisfying rust resistance results in a significantly high material cost, and the cost and effect are not always the same. Moreover, stainless steel, which has higher rust resistance, tends to have poorer adhesion to the paint, so if you try to take advantage of the texture and cleanliness of metal with partial painting, the pattern will peel off due to peeling of the paint. It often changed, and it was often impossible to communicate the original message in a relatively short period of time or it had an adverse effect.

[Problems to be Solved by the Invention] The present invention provides a decorative plate that makes use of the texture and cleanliness of metal and that can stably hold the pattern or the like that is the subject of a message for a long period of time.

By the way, in order to prevent rusting almost semi-permanently under the environment where the decorative plate is installed, use of titanium can be considered. However, titanium is not only an extremely expensive metal, but also has a fatal drawback that a reliable method for joining the steel plate of the other structural member for installing the decorative plate has not been developed at present. That is, steel is usually used for the structural member that holds the decorative plate, and welding is mainly performed to join it. The reason for this is that the strength of the organic resin adhesive is insufficient, and the weather resistance of the organic adhesive cannot be guaranteed under the environment where the ultraviolet irradiation of sunlight occurs on a daily basis. However, titanium forms a very brittle intermetallic compound with iron and cannot be welded. For this reason, titanium had to be restricted because a special construction method was required for outer walls and roofs of buildings.

INDUSTRIAL APPLICABILITY The present invention makes use of the excellent corrosion resistance of titanium and the texture and cleanliness of a metal, and has no problem in installing it on a steel structural member that holds itself, and is the main message for a long period of time. It is intended to provide a decorative plate having excellent stain resistance capable of stably displaying.

[Means for Solving the Problems] As described above, in order to prevent rusting almost semi-permanently in the environment where the decorative plate is installed, the use of titanium can be considered. However, titanium is expensive and, as described above, cannot be joined to the structural member holding itself, and cannot be used as it is. Therefore, the inventors of the present invention have conceived the use of titanium clad steel in which the surface that needs to be joined to the structural member can be welded. However, the titanium clad thin steel sheet has a very small cost reduction effect by changing the back surface of titanium to an inexpensive steel, and conversely, the cost for producing the clad is very large, so that it is more expensive than the titanium single plate. So far, it has rarely been manufactured or used. On the other hand, the present inventors have invented a method for producing a titanium clad thin steel sheet at an extremely low cost by appropriately selecting and using an intermediate medium contact material (Japanese Patent Laid-Open No. 122677/1991).
issue). The present invention has been made depending on the method of manufacturing the titanium clad thin steel sheet. That is, (1) a surface is made of titanium and a back surface is made of steel and is integrally formed of a titanium clad steel plate, and has a pattern of a hard ceramic film formed on the titanium surface by an anodizing method and / or a dry surface coating method. A decorative plate with excellent stain resistance, which is characterized by that.

(2) The front surface is titanium, the back surface is steel, and it is composed of a titanium clad steel plate integrally formed with an intermediate medium contact material for joining at its interface, and the titanium surface is anodized and / or dry surface coated. A decorative plate with excellent stain resistance, characterized by having a pattern of a hard ceramics film formed by the method.

Invented As described above, in order to achieve the object, the decorative plate of the present invention is made of a titanium clad steel plate and is formed on the titanium surface by anodization and / or dry surface coating in a predetermined pattern to be transmitted. It is characterized by having a film and / or a hard ceramic film.

Furthermore, since the back surface of the decorative plate of the present invention is steel, welding can be applied to installation to a structure. As an embodiment utilizing this feature, (3) the decorative plate excellent in stain resistance according to (1) or (2) above, wherein a mounting stud bolt is attached to a steel surface by welding.

Invented That is, by welding the stud bolt for installation in advance, it is not necessary to weld it for installation at the place where the decorative plate is installed, and the installation and removal are facilitated.

In the present invention, the type of steel on the back surface is not particularly limited, in order to maintain the corrosion resistance of the back surface and side surfaces,
It is desirable to galvanize or utilize stainless steel containing at least 10% and less than 25% Cr. In particular, when austenitic stainless steel containing 6% or more of Ni is selected as the base material, not only corrosion resistance but also workability is greatly improved.

A schematic external view showing the structure of the decorative plate according to the present invention is shown in FIG. 1, and a schematic sectional view is shown in FIG. In FIGS. 1 and 2, a is an oxide film or / and a hard ceramics film that forms a surface pattern, b is a titanium composite material, c is a base carbon steel or stainless steel, and d is for joining. The intermediate medium contact material used in the above, e is a Zn layer plated on the back surface. The titanium clad thin steel sheet used in the present invention is not only a titanium clad thin steel sheet manufactured according to JP-A-1-122677, but also any kind of metal or the like existing between titanium on the front surface and steel on the back surface. Even if braze is used, even if there is no other metal such as a titanium clad steel plate produced without using an intermediate medium contact material, the same can be applied.

In the present invention, a hard ceramic film formed by an anodic oxidation method and / or a dry surface coating method is used to form a pattern on the surface of titanium, and the interference color and / or the color of the surface coating itself is utilized. The film formed by the anodic oxidation method is, in principle, the same as the case of the titanium single plate, and is formed by electrolyzing the titanium surface as an anode in an aqueous solution containing an oxidizing agent such as (NH ₄ ) ₂ MoO ₄ . The obtained chromatic interference color can also be controlled according to the applied voltage, just as in the case of the titanium single plate.

As the dry surface coating method, a dry surface coating method such as plasma CVD, PVD, ion plating or sputtering can be applied. The types of hard ceramic coatings that can be coated include TiN (gold), TiC (black) and other coatings that are colored, or Al ₂ O ₃ , SiO ₂ and Cr.
It is possible to select one or a combination of ₂ O ₃ , ZrO ₂ , TiO ₂ , WO ₃ , and SiC, etc., which are colored by interference colors. Interfering color films are navy blue, blue, red,
It is possible to produce yellow, green, gold and even intermediate tones.

The thickness of the hard ceramic film is preferably 20 to 5000 nm. That is, when the thickness is less than 20 nm, the scratches are easily peeled off, and when the thickness exceeds 5000 nm, the cost is disadvantageous.

Next, the limiting conditions of the present invention will be shown.

The surface of the decorative plate was limited to titanium from the viewpoint of corrosion resistance, and the back surface was limited to steel or stainless steel from the viewpoint of bondability with a steel structure, and was limited to those formed integrally.

Titanium surface patterns, etc. utilize the interference color and / or the color of the film itself due to the hard ceramics film formed by the anodic oxidation method and / or the dry surface coating method from the viewpoint of weather resistance and adhesion to the titanium surface. Limited to.

[Operation] In the present invention, as a result of using titanium for the surface, there is no problem such as rusting semipermanently, and there is no contamination or change in patterns and the like due to the material. In addition, since the hard ceramics film formed by the anodic oxidation method and / or the dry surface coating method is used to form the surface pattern, etc., the pattern etc. is semipermanently free from peeling, damage or discoloration, and the original message transmission. No longer becomes impossible or counterproductive. Furthermore, by using the bare metal surface as is as part of the pattern, it is possible to express the texture and cleanliness of the metal.
The film formed by the anodizing method or hard ceramics coating is
Despite being overwhelmingly thinner than a paint film or a resin film, it has excellent wear resistance and is extremely resistant to defects.

The decorative plate as used in the present invention is a medium for sending a message to others by utilizing the texture of the material itself such as figures, letters, patterns, etc., or a member aiming to form a predetermined urban space or living environment. Including. For example, in addition to signboards, display boards, signs, guide boards, name plates or paintings, wall materials for buildings, outer wall panel boards, partition boards, tiles, shutters, blinds, screens, nameplates, posters, monuments, etc. To be

[Example] First, a display plate was prepared using a titanium clad steel plate having a titanium thickness of 80 μm and a total thickness of 1 nm as a material. After the back surface and the end surface were galvanized, an organic film was attached to the galvanized surface and pickled in HNO ₃ + HF in a mixed acid. Then, an organic film in which predetermined characters were cut out was attached, and blue characters were written on the titanium surface by the anodic oxidation method. The anodization is (NH ₄ ) ₂ MoO ₄ 50 g / l, NaF 40 g / l and H ₂ O ₂ 10 g / l
It was electrolyzed at a voltage of 20 V with the titanium surface serving as an anode in an aqueous solution containing. Then, the organic film was peeled off from the titanium surface and the galvanized surface. As a result, a transparent blue character clearly appeared on the silver-white peculiar to the metal plate, and a display plate (the product of the present invention) having a clean feeling was formed.

Also, as the material, the thickness of titanium is 120 μm and the base material is SUS43.
A display plate was prepared using a titanium clad stainless steel plate having a total thickness of 1 mm, which is 0 steel. Similarly, after pickling in a mixed acid of HNO ₃ + HF, an organic film cut into predetermined letters is attached to the titanium surface, immersed in a 20% CuSO ₄ + 5% H ₂ SO ₄ mixed aqueous solution, and other than the prescribed letters Cu plating was thinly applied to the part. Then, the titanium surface was nitrided by the plasma CVD method using N ₂ gas, and the TiN film was coated with a thickness of about 250 nm to develop a gold color. Then, it was dipped in a 30% FeCl ₃ aqueous solution to dissolve and remove Cu, leaving gold letters. Further overlapping, the portion other than gold letters was colored blue by the anodic oxidation method.
The anodic oxidation treatment was carried out in an aqueous solution containing (NH ₄ ) ₂ MoO ₄ at 50 g / l, NaF at 40 g / l and H ₂ O ₂ at 10 g / l.
It was electrolyzed at a voltage of 0V. At this time, the gold characters written by the plasma CVD method were not anodized and remained as they were. As a result of the above, a gold character clearly stood up on a transparent and clear blue background, and a clear and clean display plate (product of the present invention) was obtained.

For comparison, a display plate was prepared using a carbon steel plate having a thickness of 1 mm. After coating the carbon steel sheet white, including the back side,
I wrote the same letter with blue paint. At the beginning of the production, a display board (comparative product) with blue letters clearly appearing on a white background was created. However, the texture and cleanliness peculiar to metal were not obtained from this display board.

Next, after dropping many gravel with a diameter of 5 to 10 mm from the height of 5 m on the patterned surface of the created 3 types of display boards, the corrosion test based on the salt spray test specified in JIS-Z2371 was performed for 48 h. Carried out. The decorative plate using the titanium clad steel plate had a slightly roughened surface and reduced gloss, regardless of the steel type on the back surface, but there was no change in the pattern or the like. However, the entire surface of the decorative plate made of carbon steel plate is rusted,
The white painted parts other than the letters were dyed with red rust, and some coating films were peeled off. As a result, it became difficult to read the characters on the surface.

A steel stud bolt was welded to the back surface of the decorative plate using a titanium clad stainless steel plate, and the structure was installed with a nut. The decorative plate was easily installed by tightening the nuts.

EFFECTS OF THE INVENTION The present invention can provide a decorative plate that can express a stable message for a long period of time, is easy to install on a steel structure, and expresses the texture and cleanliness of metal. It was As a result, maintenance is not necessary for discoloration, contamination, damage, etc. of the decorative plate. Especially when it is used as the exterior of a high-rise building, the risk of falling and the maintenance is unnecessary, and the economic effect is great. Moreover,
By eliminating the pollution and damage to the decorative plate, the deterioration of the urban space and living environment will be prevented, and the profit effect from an amenity point that does not appear directly in the economic effect will be enormous.

[Brief description of drawings]

1 (A), (B), (C) and FIG. 2 (A),
(B), (C) is a cross-sectional schematic diagram which shows the structure of the decorative plate of this invention. a ... Oxide film and / or hard ceramic film that forms patterns on the surface b ... Titanium as a composite material c ... Carbon steel or stainless steel as a base material d ... Intermediate contact material used for bonding e ... Zn layer

Claims (3)

[Claims] 1. A titanium clad steel plate having a front surface made of titanium and a back surface made of steel and integrally formed, and having a pattern of a hard ceramic film formed on the titanium surface by an anodic oxidation method and / or a dry surface coating method. A metal decorative plate with excellent stain resistance, which is characterized in that 2. A front surface is made of titanium, a back surface is made of a titanium clad steel plate integrally formed with an intermediate medium contact material for joining at its interface, and a titanium surface is anodized and / or dry type. A metal decorative plate with excellent stain resistance, which has a pattern of a hard ceramic film formed by a surface coating method. 3. A metal decorative plate having excellent stain resistance according to claim 1, wherein a stud bolt for installation is attached to the steel surface by welding.