JPH0632995A - Chromatic glittering powder - Google Patents

Abstract

PURPOSE:To obtain a chromatic light excellent in glittering and improve the appearance of a coated or molded surface by coating a metallic surface of a fine platy substrate powder with a thin, flat, transparent film of titanium dioxide. CONSTITUTION:A chromatic glittering powder is obtd. by coating a metallic surface of a fine platy substrate powder with a thin, flat and, transparent film of titanium dioxide. The thin film of titanium dioxide is formed on the surface of the substrate powder pref. by suspending the substrate powder in water or in an org. solvent, adding a titanium compd. to the suspension, hydrolyzing the compd., and depositing the resulting fine particles of titanium hydroxide on the surface of the substrate powder. The obtd. glittering powder utilizes positively the principle that the hues of reflected visible rays, such as red, yellow, green, blue, indigo blue, and purple, are intensified corresponding to the thickness of the titanium dioxide film. The metallic luster of the surface of the substrate powder enables a chromatic reflected light to be obtained in a more distinct state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is applied to a varnish such as a light-transmitting paint or ink, which is dispersed and applied, or mixed with a light-transmitting synthetic resin material to form a sheet, a plate or the like. By molding into a shape, the surface or inside of various required solids, when exposed to external light, red, orange, yellow, green, blue, indigo, purple, etc., depending on the color of each powder, selected one or more appropriately selected A chromatic brilliance for mixing paints or for molding resin materials that can obtain a molded product with a painted surface or molded surface that emits independent reflected light like a constellation with a deep color. It is about sex powder.

[0002]

2. Description of the Related Art Mica titanium based on mica powder is known as a material in which a titanium oxide film is formed on a plate-like powder. However, the powder is white or white silver, and when dispersed in a coating film, the pearl luster is strong, but the luster is considerably poor. On the other hand, gold powder, silver foil powder, aluminum foil powder and the like are generally known as powder materials having a strong glittering property. Further, it is also known that thin plate-like powder such as mica or glass flakes is plated with metal.

[0003]

However, in the case of such a metal foil powder or a metal-plated powder,
Only the metallic light of the powder itself can be obtained, and chromatic light of various colors as described above cannot be obtained.

Therefore, in the case of using such a conventional foil-like powder having metallic luster, the paint varnish is colored with a dye or a transparent pigment of a desired color in order to obtain a brilliant aesthetic appearance of chromatic color. I had no choice but to color it.

In this case, however, the incident light is absorbed by the mixed dye or pigment and the external transmission of the reflected light is hindered, so that the reflectance is lowered and the glittering property is lowered. However, the problem that only the same color as that of the dye or pigment mixed with the bright color can be obtained cannot be solved.

Therefore, the object of the present invention is to obtain a completely new chromatic color light excellent in brilliance which cannot be obtained by the conventional means, and to improve the aesthetic appearance on the coated surface or the molding surface. In particular, when receiving direct light such as sunlight or headlights of automobiles, it is possible to form a painted surface or a molding surface that emits independent light such as a deep constellation in a submerged state. Another object of the present invention is to provide a powder having excellent brilliance which emits chromatic light of any one or a plurality of colors selected from chromatic light of seven colors.

[0007]

Means for Solving the Problems The structure of the glittering powder of the present invention for achieving the above object is as follows. A transparent and smooth thin film of titanium dioxide is formed on the surface of a flat fine powder having a metallic luster. It is formed and coated.

According to the present invention, the reflected light on the surface of a titanium dioxide film (hereinafter simply referred to as "titanium oxide film" except the examples) coated on the base powder and the surface of the titanium oxide film and the base powder are In the interference action with the reflected light at the interface,
This is based on the principle that reflected light of a specific wavelength is strengthened according to the thickness of the titanium oxide film. That is, according to the present invention, the red, yellow, green, blue,
By actively using the principle that the shade of the reflected light of visible light such as indigo and purple can be strengthened, and also by selectively using the base material powder whose surface has metallic luster, the reflected light of chromatic color can be Is obtained in an even clearer state.

On the other hand, when the base powder has a high visible light transmittance, the visible light transmitted through the titanium oxide film transmits the powder and the reflected light reflected on the back side thereof and the solid to be coated. Or, the reflected light from the boundary surface of the molded product and the reflected light from the surface of the coated solid in the coated product overlap with the reflected light on the surface side of the titanium oxide film of the powder and interfere with each other. Since the color is weakened, a specific chromatic color cannot be emphasized, which is not preferable.

As described above, the chromatic color glittering powder referred to in the present invention is a fine powder, but each powder itself has a flat plate shape, and the surface thereof is coated with a titanium oxide film. By adjusting the coating thickness, the powder itself emits reflected light of a desired chromatic color set in advance.

As the flat fine powder material, in addition to natural or synthetic flat iron oxide, flaky metal powder, particularly aluminum foil or nickel powder, metal foil powder, or glass coated with metal Flakes and mica are suitable. However, the material is not particularly limited, and may be a flat plate having a metallic luster on the surface, easy to form a mirror surface, or easy to form a coating film of titanium dioxide.

The particle diameter (size of the flat plate surface portion) of the material is, for example, preferably in the range of 5 μm to 200 μm, and particularly preferably in the range of 10 μm to 150 μm. 5
If it is smaller than μm, the brightness of light becomes small and it becomes inconspicuous. However, there is a problem in that it is likely to settle to the bottom of the container or the device during storage or during painting work, and the nozzle of the spray gun is easily clogged, making spray painting difficult.

As a method for forming a titanium oxide film on the plate-like powder, the powder is suspended in water or an organic solvent, a titanium compound is added to the suspension, and hydrolysis is carried out to form fine particles of titanium hydroxide on the surface of the powder. The method of depositing is suitable. For such a wet method, a vacuum deposition method or a CVD method is used.
A dry method such as the method can also be applied.

The thickness of the titanium oxide film is preferably in the range of 0.1 μm to 10.0 μm, and more preferably in the range of 0.1 μm to 5.0 μm, from the viewpoint of light brightness and brightness of bright color. It is possible to obtain a brilliance of chromatic color with sufficient vividness. If it is thinner than 0.1 μm, it is difficult to produce chromatic color, and if it is thicker than 10.0 μm, the coating has to be formed several times, which causes a problem that coating takes time. Not preferable. On the other hand, in order to fully exhibit the glitter characteristics of the chromatic color glitter powder dispersed in the coating film, the coating base is preferably a dark color that absorbs visible light. Further, it is preferable that the dispersed one on a plastic sheet is attached to a dark base.

[0015]

EXAMPLES Examples of the present invention will be described below. << Examples 1 to 4 >> Examples 1 to 4 are examples in which naturally occurring gray-black plate-shaped iron oxide is used. The plate-shaped iron oxide is adjusted by sieving it into particles having a particle size of 30 to 100 μm, and then enclosed in an autoclave equipped with a stirring device together with a solution of 11N sodium hydroxide, and the mixture is heated at 200 ° C. to 30 ° C.
It was hydrothermally treated for minutes, washed, and dried. The color, size, and shape of the powder thus obtained were almost the same as those before the treatment, but the surface exhibited a strong achromatic brilliance, and this was used as the base powder.

This base powder was suspended in water at a concentration of 200 g / l, and an aqueous solution of titanium oxide sulfate was added to the powder at a ratio of 1.0 to 4.0% in terms of titanium oxide, to obtain 60 The mixture was heated to ℃, ammonia water was added dropwise to the solution to adjust the pH to 6-8.
After stirring for 60 minutes to deposit fine particles of titanium hydroxide on the surface of the powder, this is filtered and washed,
The powder obtained by drying was fired at 500 ° C. for 60 minutes. The powder thus obtained exhibited a brilliant property with a strong color as shown in Table 1. However, the film thickness of titanium oxide shown in the same table and Table 2 below is a value calculated from the titanium dioxide content of the obtained powder and the surface area of the base powder.

[0017]

<< Examples 5 to 8 >> In Examples 5 to 8,
Glass flakes with silver plating (density = 2.9, A
This is an example in which a g film thickness of 0.05 μm and a calculated specific surface area of 0.07 m ² / g) are used. This is sieved and the particle size is 60-12
The one adjusted to 0 μm has an aspect ratio of 18, and exhibits a strong achromatic brilliance. Using this powder as a base material, it was suspended in isopropyl alcohol at a concentration of 200 g / l, and tetraisopropoxytitanium having a titanium oxide content of 28.1% (hereinafter abbreviated as "TIPT"). ) Was added and dissolved, and water was added at a molar ratio of 6 times that of TIPT, and the mixture was heated to 60 ° C. and stirred for 120 minutes, and then the powder was filtered and washed. In a nitrogen atmosphere, baking was performed at 350 ° C. for 30 minutes. The powder thus obtained has a second content depending on the amount of TIPT added.
A powder having the colors as shown in the table and having a strong luster is obtained.

[0019]

Although the examples considered to be representative of the present invention have been described above, the present invention is not necessarily limited to only these examples, and is provided with the above-mentioned constitutional requirements referred to in the present invention. The present invention can be appropriately modified and carried out within the scope of achieving the object of the invention and having the following effects.

[0021]

As is clear from the above description, the chromatic bright powder referred to in the present invention is a fine powder, but each powder itself has a flat plate shape, By using a powder having a metallic luster as a base material and coating the surface thereof with a titanium dioxide film,
By adjusting the coating film thickness, a specific color selected in advance among the chromatic colors is reflected.

Therefore, the glittering powder of the present invention is mixed with a varnish such as a light-transmitting paint or ink, dispersed and applied to the surface of the solid to be coated, and each powder receives external light. It is possible to form a painted surface that emits independent light in a scattered manner, such as a constellation with a chromatic depth corresponding to the color of. Further, by combining the color of the solid to be coated and the reflected light color of the powder, and by further using the powders having different reflected light colors in combination or coloring the varnish, various tastes can be obtained. It has a remarkable effect that can not be expected from the conventional ones in that a coated surface having an aesthetic appearance can be obtained.

The glittering powder of the present invention is used by mixing it with a synthetic resin molding material having a relatively high light-transmitting property, so that a light of a unique chromatic color such as a constellation with the same depth as described above can be obtained. It has a remarkable effect that it is possible to obtain a resin-molded product which is formed into a sheet-shaped, plate-shaped or other desired shape by scattering the above.

Front Page Continuation (72) Inventor Shinsuke Matsubara 4-6-50 Kamikita, Hirano-ku, Osaka Osaka Vacuum Industry Co., Ltd.

Claims (1)

[Claims] 1. A brilliant chromatic color powder obtained by forming a transparent and smooth titanium dioxide thin film on the surface of a flat fine powder having a metallic luster.