JPH0693206A - Chromatic bright powder - Google Patents

Abstract

PURPOSE:To obtain a powder, excellent in saturation and useful as coatings, inks, etc., alternately laminating and forming transparent and smooth thin films of titanium dioxide and thin films of silicon dioxide transparent and smooth similar to the thin films of the titanium dioxide in a prescribed number of layers on the surface of specific fine powder. CONSTITUTION:The powder is obtained by alternately laminating and forming two or more, to six layers of transparent and smooth thin films of titanium dioxide and thin films of silicon dioxide transparent and smooth similar to the thin films of the titanium dioxide on the surface of platy fine powder such as iron oxide or mica having the surface with metallic luster (the particle diameter is preferably 5-200mum).

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 extrusion molding into the shape, on the surface or inside of various required solids, one color selected appropriately such as red, orange, yellow, green, blue, indigo, purple according to the color of each powder when exposed to external light or A chromatic color for mixing paints or molding resin materials that can obtain a molded product with a painted surface or molded surface that emits independent reflected light such as constellations with multiple colors. It relates to a glittering powder.

[0002]

2. Description of the Related Art Conventionally, gold foil powder, silver foil powder, aluminum foil powder and the like have been generally known as a mixed powder material for coating which emits reflected light of this kind. 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, incident light is absorbed by the mixed dyes and pigments, and it also hinders the external transmission of reflected light, so that the reflectance of reflected light is lowered and the glittering property is lowered. It is impossible to solve the problem that it has a problem and that only the same color as that of the dye or pigment mixed with the bright color can be obtained.

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 selected color or plural colors selected from the chromatic light of seven colors.

As a powder capable of exhibiting such an excellent effect, the present inventors formed a transparent and smooth thin film of titanium dioxide on the surface of a flat fine powder having a metallic luster. I have already developed and proposed what I did. (For example, refer to the specification of Japanese Patent Application No. 4-209683)

The present invention utilizes the titanium dioxide film described in the prior invention, and by alternately laminating the titanium dioxide film and the silicon dioxide film, the saturation of the chromatic color in the powder is further strengthened and further enhanced. We are going to propose here a powder that emits excellent bright chromatic light.

[0009]

Means for Solving the Problems The structure of the glittering powder of the present invention for achieving the object is a flat plate-like surface having a mirror-like metallic luster and reflecting most of visible light. Two or more six layers of transparent and smooth titanium dioxide thin films and transparent and smooth silicon dioxide thin films are alternately formed on the surface of the fine powder.

A titanium dioxide film (hereinafter referred to as a "base material", which is referred to as a "base material" and laminated powder is referred to as "powder"), which is a base material in the present invention, is coated with the powder. "Titanium oxide film" except for the example),
As for the silicon dioxide film (hereinafter referred to as “silicon oxide film” except for the examples), any one of the base materials may be coated first.
Similarly, the outermost layer may be any film, but a silicon oxide film is preferable. The number of layers of the film is preferably from two to six, and even if seven or more layers are laminated, it is difficult to improve the optical characteristics (saturation / brightness) of the powder.

The film thickness of each layer is adjusted according to the desired color of the glitter. As a general rule, each film thickness is set to be a refractive index of the film × geometrical thickness = a quarter thickness of the center wavelength of the chromatic light to be obtained, or an integral multiple thereof. However, it is extremely difficult to measure the laminated film thickness. However, regarding that the laminated film is formed by alternately laminating titanium oxide and silicon oxide, the surface of the powder subjected to the laminating process is subjected to surface analysis by Auger electron spectrum (AES) while performing sputtering with argon gas. It can be confirmed by doing.

The external light incident on the powder is reflected light at the surface of the outermost layer, reflected light at the interface between the surface of the base material and the film of the first layer, and reflected light at the interface between the films. And will be visible. Therefore, by utilizing the principle that the reflected light of a specific wavelength is particularly enhanced by adjusting the film thickness of each coating layer according to the wavelength of the specific chromatic color light as described above. That is, the present invention positively utilizes this principle, alternately stacks a titanium oxide film and a silicon oxide film, and specifies the respective film thicknesses, so that the red and yellow films corresponding to the film thicknesses can be obtained.・ It is possible to strengthen the hue of the reflected light of visible light such as green, blue, indigo, and purple for each layer.
Moreover, by selectively using a fine powder having a metallic luster as a base material, chromatic color reflected light can be obtained in a more vivid state.

On the other hand, when the fine powder to be the base material has a high visible light transmittance, the visible light that has passed through the titanium oxide film or the silicon oxide film passes through the base material and its rear side. Since the reflected light reflected by (2) overlaps the above-mentioned reflected light on the powder surface side and causes unfavorable interference and weakens the specific color, it becomes difficult to emphasize the specific chromatic color.

Therefore, for the chromatic color glittering powder referred to in the present invention, the fine powder used as the base material is selected to be a fine powder having metallic luster and a low visible light transmittance, and
Even though it is a fine powder, each powder itself has a flat plate shape, and has a wide light reflecting surface, which is selectively used.

As the flat fine powder, in addition to natural or synthetic flat iron oxide, flaky metal powder, particularly aluminum or nickel powder, metal foil powder, and glass coated with metal are used. Flakes and mica are suitable. However, the powder material is not particularly limited, and may be a flat plate whose surface is a mirror surface, which is easy to form a mirror surface, or which is easy to form a titanium oxide film or a silicon oxide film. Any surface may be used as long as it reflects most of visible light.

The particle size of the base material (size of the flat surface portion) is 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, and if it is larger than 200 μm, it tends to cause unevenness on the coating film or molded product surface when compounded with paint or synthetic resin, and when mixed with paint. 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.

The method for forming a titanium oxide film is to suspend the powder in water or an organic solvent, add a titanium compound to the suspension, and hydrolyze the resulting solution to deposit fine particles of titanium hydroxide on the surface of the powder. Are suitable. In addition to such a wet method, a dry method such as a vacuum deposition method or a CVD method can be applied. Further, the formation of the silicon oxide film can be performed by a similar method. That is, the powder is suspended in water or an organic solvent, to which a silicon compound is added and hydrolyzed to deposit fine particles of silicon oxide on the surface of the powder. Next, the powder is separated by filtration, washed, dried and fired.

Examples of the titanium compound used include titanium tetrachloride, titanium oxide sulfate, and titanium alkoxide. Further, as the silicon compound, for example,
Examples thereof include water-soluble silicates such as sodium silicate and potassium silicate, aqueous silica sol, organosilica sol, and alkoxides such as tetraethoxysilane. The powder that has been subjected to the film forming treatment has a temperature of 200 to 500 ° C.
Heat treatment in degrees. When silicon oxide is coated and the surface thereof is coated with a titanium oxide film, the silicon oxide film is 12
It may be simply dried at 0 ° C. Then, after forming a titanium oxide film, it is fired at 200 to 500 ° C.

[0019]

EXAMPLES Examples of the present invention will be described below. Example 1 A glass flake having a thickness of 5 μm and a particle size of 60 to 120 μm was nicked with a nickel paste having a thickness of 0.15 μm, and a powder having a silver glittering property due to the nickel paste was used as a base powder. The powder in isopropyl alcohol, 2
It was suspended at a concentration of 00 g / l, and tetraethoxysilane (hereinafter abbreviated as TES) having a SiO ₂ content of 28.1% was used as SiO _{2 and} an amount equivalent to 2.0% was added to the powder. After being dissolved, water was added to the TES in a molar ratio of 6 times, the mixture was heated to 60 ° C., and after stirring for 60 minutes, the powder was filtered, washed, and dried at 120 ° C. Next, in order to form a coating of titanium oxide on the surface of the powder, the content 34.4% of tetraisopropoxytitanium TiO ₂ (hereinafter abbreviated as TIPT), 2.0% as TiO ₂ added The mixture was dissolved in water, water was added at a molar ratio of 6 times that of TIPT, the mixture was heated to 60 ° C., stirred for 60 minutes, the powder was filtered, washed, and heat treated at 200 ° C. for 30 minutes. Then, the obtained powder is treated under the same conditions as in the case of forming the above-mentioned silicon dioxide film, and heat-treated at 200 ° C. to form SiO ₂ / TiO ₂ / SiO _{2 on} the surface of the base material powder.
Was formed into a three-layer film. The powder thus obtained is
As compared with the case of Comparative Example 1 described later in which a single film of titanium oxide was formed as a coating, it exhibited a bright blue brilliance with high saturation.

Example 2 Using the same base material powder, TES, and TIPT as in Example 1, SiO ₂ was formed on the surface of the base material powder in the same manner as in Example 1.
The coating was formed in the order of / TiO ₂ / SiO ₂ / TiO ₂ / SiO ₂ . The powder thus obtained exhibited a more vivid blue color than the powder of Example 1. A coating film formed by dispersing the powder in an acrylic paint varnish and applying it to the surface of a gray plastic plate is blue when the incident angle is within 40 °, and green when the incident angle is within 40 ° to 60 °. Was presented.

Example 3 TES or TIPT added to a powder suspension during the formation of the titanium oxide and silicon oxide films in Example 2.
Of SiO ₂ / powder and TiO ₂ / powder were 1.0%. Otherwise, the same treatment and method as in Example 2 were performed to obtain SiO ₂ / TiO ₂ /
To form a SiO ₂ / _{TiO 2} / SiO ₂ multilayer film. The powder thus obtained exhibited a golden luster with higher saturation than that of Comparative Example 2 described later.

Comparative Example 1 Using the same base material powder and TIPT as in Example 1, a single layer film of TiO ₂ was formed on the surface of the base material powder by the same method and means. The obtained powder had a blue brilliance.

Comparative Example 2 Using the same base powder and TIPT as in Example 3, a TiO ₂ single layer film was formed on the surface of the base powder by the same method and means. The obtained powder had a blue brilliance.

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.

[0025]

As is apparent from the above description, the chromatic color glittering powder referred to in the present invention is a fine powder itself, but each powder has the same flat plate shape as that of the base material. With a wide reflective surface, light can be reflected, and powder with high light brightness can be obtained.

The fine powder as a base material has a metallic luster, and its surface is alternately coated with a titanium dioxide film and a silicon dioxide film, and the coating film thickness is adjusted so that the powder is incident on the powder. The reflected external light is identified not only by the reflected light at the surface of the outermost layer and the reflected light at the interface between the surface of the base material and the first layer, but also by the reflected light at the interface between the films. It enhances the reflected light of the chromatic color of, and reflects the vivid chromatic color of high saturation selected in advance.

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 to receive the external light. It is possible to form a painted surface that emits independent light in a scattered manner, such as a constellation with a brilliant and highly saturated chromatic color corresponding to the color of. In addition, by combining the color of the solid to be coated with the reflected light color of the powder, and also by using several kinds of powders having different reflected light colors in combination, or by coloring the varnish, It has a remarkable effect that a coated surface having a different 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, whereby a chromatic color similar to that described above, a vivid and highly saturated constellation is provided. It also has a remarkable effect that it is possible to obtain a resin molded product which is extruded and molded into a sheet-shaped, plate-shaped or other desired shape by emitting such a peculiar chromatic light in a scattered manner.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shinnori Matsubara 4-6-50 Kamikita, Hirano-ku, Osaka City Osaka Vacuum Industry Co., Ltd.

Claims (1)

[Claims] 1. Two or more layers of six layers are alternately laminated on the surface of a flat fine powder having a metallic luster on the surface of which a transparent and smooth titanium dioxide thin film and a transparent and smooth silicon dioxide thin film are alternately formed. A chromatic glittering powder.