JPH05171055A - Colored mica - Google Patents

Abstract

PURPOSE:To produce the title mica by causing a thin film of colored glass gel to be adsorbed onto the surface of mica uncoated or coated with a metal oxide according to the sol-gel process. CONSTITUTION:The surface of mica uncoated or coated with a metal oxide is coated with a coating liquid for formation of a thin film of glass gel, comprising, for example, tetraethoxysilane as a metal alkoxide, a pigment and a dye as coloring agents, an alcohol as an organic solvent and an acrylic resin as a dispersant to obtain the title mica.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses a coating solution for forming a glass gel thin film, which comprises a metal alkoxide and / or a condensation polymer of a metal alkoxide, a dye, an organic solvent and a dispersant. The present invention relates to a mica or a metal oxide-coated mica whose surface is coated with a colored metal oxide gel formed by the method.

[0002]

Conventionally, mica has been widely used as a material for imparting a pearly luster to paints, cosmetics, plastics, inks, paints, ornaments, daily sundries, textiles, ceramics and the like. At that time, the mica can be used as it is, but in general, it is often used as a composite material in which the surface of the mica is coated with a metal oxide. As the metal of the metal oxide, there are titanium, zirconium, tin, aluminum, iron, cobalt, chromium, vanadium and the like, and mica coated with these metal oxides is widely used as a so-called pearl luster pigment.

As an optical effect of the pearl luster pigment, a pearl color ranging from pearl to green is obtained as a result of an interference phenomenon of strengthening a certain wavelength and removing other wavelengths. However, since the interference color does not exhibit strong brilliance, the appearance color is always close to white, and a vivid appearance color matching the interference color has not been obtained.

Therefore, it is often necessary to add absorbing pigments in order to enhance the brilliance of the color. If the concentration of absorbing pigment used is too high, the product pearlescence is lost. Although the absorbing pigment is finely ground, it disperses the light and consequently reduces the pearlescence. Therefore, in many cases, the amount of absorbing pigment added is limited by the acceptable degree of gloss reduction.

In order to obtain various appearance colors, colored pigments such as iron oxide, dark blue, chromium oxide, carbon black and carmine are added to the pearl pigment. The safety, stability, weather resistance and heat resistance of these colored mica pigments
The acid resistance, alkali resistance, solvent resistance, etc. largely depend on the properties of the added colored pigment. For example, when navy blue is added, the pigment becomes weak in alkali, and the red pearl pigment to which carmine is added is inferior in weather resistance.

Further, since the above colored mica pigment is added with a colored pigment, this type of colored mica pigment has various drawbacks such as color separation, color transfer and color change in a solvent. As a technique for improving these drawbacks, a pearl pigment having a colored substance attached to the surface of mica has been proposed.
It is an example in which navy blue was directly adhered to mica and an example in which Berlin blue was formed on the surface of mica, which is similar to the example. However, in this case, the colors that can be obtained are limited, and there is a large limitation in terms of hue.

[0007]

As described above, most of the currently used colored pearlescent pigments are so-called pearl pigments to which a colored pigment is added. Some pigments were coated on the mica, but those pigments gave only a partial color. It is an object of the present invention to obtain a colored pearl pigment which can freely obtain many colors and is excellent in its properties.

[0008]

The colored glass gel-coated pearl pigment according to the present invention compensates for the above-mentioned drawbacks of the colored mica pigment. That is, a dye is dispersed in a metal alkoxide, a coating solution is prepared using a suitable dispersant and a solvent, the surface of the mica is coated with the coating solution, and then the mica is kept at around 150 ° C. to form a sol. The gel is changed into a gel, and the colored gel film is fixed to the surface of the mica. The degree of sticking of the gel film to the mica surface is very strong, but it is not necessary to completely cover the surface of the mica, and rather it seems that an uncovered surface is more advantageous for obtaining a pearly luster. is there.

Metal alkoxides are generally M (OR) _n
It is represented by. Here, M is a metal element, OR is an alkoxyl group, and n is the oxidation number of the metal. Si (OR) ₄ is typically used as the metal alkoxide, but other than Si, Zn, Ti, Al, Fe, Co, Ni and the like can be used alone or in combination according to the purpose. For example, if you want to increase the reflectance, Ti or Z
n, strength, and alkali resistance are required to be Zr,
When it is desired to further improve the weather resistance, it is effective to mix Ni or the like.

Alcohols are commonly used as organic solvents that can be used, and alcohols having 1 to 5 carbon atoms are particularly effective.

As the pigment, almost any pigment or laked dye can be used to prepare the coating solution of the present invention. Examples thereof include benzidine yellow, carmine FB, perylene, dioxazine, thioindigo, quinacridone, and phthalocyanine. , Carbon black, cobalt blue, red iron oxide, yellow lead and the like. It is desirable that the added amount of the dye is at least 0.01% or more.

As for the dispersant, as a result of diligent studies, the following substances were found to be effective. 1) Polyvinyl butyral resin. For example, Eslek B
L-12 2) Polyvinyl alcohol resin. For example, Gocelan L
-0301 3) Acrylic resin. For example, Hitech 5324 4) Ethyl cellulose. For example, Ethocel 5) unsaturated polycarboxylic acid. For example, BIC 104S 6) Phosphate ester activator. For example, Death Call A-
2007 7) Polyester resin. For example, Polyester WR-9
01 8) Silane coupling agent. For example, KBM-502 9) Titanium coupling agent. For example, B-1 (TBT) 10) aluminum coupling agent. For example, aluminum chelate M The amount of these dispersants added is 5 wt% to 10% with respect to the pigment.
0 wt% is preferable.

The present invention will be described below with reference to examples. (Example 1) Pigment Red 254 (red pigment) 1 g TSL8311 (silane coupling agent) 0.2 g Ethocel 7CP (ethyl cellulose) 0.8 g isopropyl alcohol 170 g First, the above material was 0.5 mm zircon beads with an SG mill (disperser). Is dispersed for 5 hours to prepare a pigment dispersion liquid. Then, the following formulation was mixed with a propeller stirrer to obtain a coating liquid of the present invention. Si (OC ₂ H ₅ ) ₄ 12 g Salt acid 0.15 g Water 12 g The total amount of the above dispersion liquid Ethyl alcohol 14 g

(Example 2) Pigment Blue 15 (blue pigment) 1 g Gocelan L-0301 (polyvinyl alcohol resin) 1 g Isopropyl alcohol 170 g The above materials were mixed in the same manner as in Example 1 to prepare a pigment dispersion liquid. Then, a coating liquid was prepared with the following composition. Si (OC ₂ H ₅ ) ₄ 5 g Si (OC ₃ H ₇ ) ₄ 5 g Nitric acid 0.1 g Water 12 g Total amount of the above dispersion isopropyl alcohol 10 g

(Examples 3 to 7) A coating liquid was prepared in the same manner as in Example 1 and Example 2 except that the colorant was variously changed. Example 3: Pigment used = Pigment Violet
19 Example 4: Pigment used = Pigment Green 7 Example 5: Pigment used = pigment Yellow
83 Example 6: Dye used = Rhodamine B (Rose dye) Example 7: Dye used = Methylene blue (Blue dye)

(Example 8: Production of colored mica) 150 g of the coating solution obtained in Example 1 was poured into 150 g of titanium oxide-coated mica and stirred well to confirm that the surface of the mica was sufficiently covered with the solution. Then, gradually raise the temperature from room temperature to 6
The whole is kept at 0 ° C. and dried to form a colored gel layer. The temperature is raised to about 150 ° C. and left for 1 hour to fix the colored gel layer on the surface of the mica. A brightly glossy mica with a red interference color was obtained.

(Examples 9 to 14: Production of colored mica) Using the coating liquids obtained in Examples 2 to 7 in the same manner as in Example 8, interference colors of blue, violet, green and yellow were obtained. A strong lustrous colored mica was obtained. Similar colored mica was obtained with other metal oxide-coated mica instead of titanium oxide-coated mica, and pearlescent colored mica was also obtained by coating the surface-untreated mica itself.

(Example 15: Utilization of colored mica: manufacture of paint) Using the colored mica obtained in Examples 8 to 14, paints were prepared. 4 parts of colored mica, 16 parts of aminoalkyd clear and 10 parts of thinner are mixed with a paint conditioner to produce a base paint. The obtained base paint was diluted with 50 parts of amino alkyd clear to obtain an amino alkyd paint. In the paint, no detachment of pigment from the colored mica and discoloration were observed.

The coating material obtained was applied to a metal and baked at 150 ° C., and the state of the coating film was observed. All were pearlescent coatings with vivid colors.

(Example 16: Use of colored mica: production of lipstick) Using the red colored mica obtained in Examples 8, 10 and 13, lipsticks were produced. 3 parts of colored mica, 5 parts of titanium oxide, 55 parts of castor oil, 7 parts of wax, 10 parts of paraffin, 10 parts of lanolin and 10 parts of myristic acid ester were mixed and roll-kneaded to produce a lipstick. When the obtained lipstick was applied to the skin, a bright pearlescent film was obtained.

The present invention can take various changes and modifications to the method and product. The various embodiments described above are for the purpose of further clarifying the content of the present invention, and not for limiting the present invention.

As described above, according to the present invention, it is possible to obtain a colored mica which has a great degree of freedom in color and is excellent in solvent resistance. By using the colored mica, paints, inks, cosmetics, plastics, paints, textiles, etc. having a pearlescent luster of a desired color can be obtained very easily.

Claims (1)

[Claims] 1. A colored mica characterized in that the surface of mica or metal oxide-coated mica is coated with a metal oxide gel containing a pigment.