JPH08269357A - Pearl-lustered pigment - Google Patents

Abstract

PURPOSE: To obtain a pearl-lustered pigment capable of manifesting novel interference color, excellent in brightness, light resistance and heat resistance, thus useful as a colorant for coating materials, cosmetics, inks, etc., by coating a specific kind of synthetic mica with a metal oxide. CONSTITUTION: This pearl-lustered pigment is obtained by coating synthetic mica with a metal oxide such as titanium dioxide rutilated with tin chloride. The synthetic mica is e.g. a kind of colored synthetic mica which has the following characteristics: at least one kind selected from Nb, Cu, Ho, Mn, Cr, Ni, Pr, In, V, Ce, Co, Nd and Er is contained on one or more spots of interlaminar, octahedral and tetrahedral cations; having flat particle surface; consisting of flaky particle 3-100 micron in planar diameter, 0.05-1 micron in thickness and >=60 in average aspect ratio.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a colorant for paints, cosmetics, inks and plastics.
With regard to the luster pigments, in more detail, a colored synthetic mica is used as a substrate, and the interference color is combined with the color of the colored synthetic mica of the substrate and is amplified and is a novel interference color that cannot be seen at all in conventional pale luster pigments. In addition, the present invention relates to a novel pearl luster pigment exhibiting a color different from that of synthetic mica with color in the shade portion and exhibiting a novel color not seen in conventional pearl luster pigments.

[0002]

2. Description of the Related Art A pearl luster pigment which gives a pearly feel by coating a natural mica with a metal oxide such as iron oxide or titanium oxide has been known. These pearl luster pigments form a thin layer of titanium oxide on mica, and control the thickness of the thin layer to obtain silver, gold, red, blue,
The interference color such as green is obtained. However, since this pearl luster pigment uses natural mica as a substrate, it is not a satisfactory interference color, and the color of the shade portion is only a color that is in a relationship of complementary color with the interference color, which leads to diversification of design. There was a problem we could not address.

Conventionally, it has been considered that mica used as a substrate for a pearl luster pigment is preferably colorless and transparent. That is, the pearl luster pigment causes the light reflected by the mica of the substrate to develop a color due to the interference effect that occurs when passing through the metal oxide, but when the mica is colored, a specific light is emitted. It was recognized as inappropriate because it was absorbed. Actually, the pearl luster pigment using the colored synthetic mica as a substrate has not been industrially used at all. When natural mica is used as a substrate, mica with some coloration due to impurities is also used, but as described above, a pearl luster pigment having a satisfactory interference color cannot be obtained. .

On the other hand, a pigment obtained by adding a color pigment such as iron oxide, dark blue, chromium oxide, or carmine to a pearl luster pigment having an interference color and coating the pearl luster pigment is known as a colored pearl luster pigment. . However, the color of these colored pearl luster pigments is limited to red, brown, blue, yellow, green, etc. of the pigment itself which is added to and coated with the pearl luster pigment, and the color is opaque, and the interference color. It was not beautiful and lacked in novelty. In addition, since these color pigments are inferior in light resistance and heat resistance, this colored pearl luster pigment has a problem in long-term stability.

[0005]

SUMMARY OF THE INVENTION The present invention is intended to solve such a problem, in which a novel colored interference color is produced by an interference action, and at the same time, a shaded portion is used. It is an object of the present invention to provide a pearl luster pigment that exhibits a transparent and beautiful color that is not seen in any lustrous pigment.

[0006]

Means for Solving the Problems As a result of earnest research to solve the above problems, the present inventors have found that
One or more positions of octahedral and tetrahedral cations are substituted with a specific colored element, and the pearl luster pigment obtained by coating the colored synthetic mica with a metal oxide is preferably colorless and transparent mica. Contrary to conventional wisdom, it has developed a novel interference color that cannot be seen in conventional pearl luster pigments, and in the shade part, it has a transparent feel like colored glass, and is a colored synthetic mica. The inventors have found the unexpected fact that they express a novel and beautiful color different from that of the present invention, and arrived at the present invention.

The colored synthetic mica used in the present invention is represented by the following formula (1): X _0.5-1 Y _2-3 Z ₄ O ₁₀ (F, OH) ₂ (1). ), Octahedron (Y) and tetrahedron (Z) cations at one or more positions with Nb, Cu,
Ho, Mn, Cr, Ni, Pr, In, V, Ce, C
at least 1 selected from the group consisting of o, Nd and Er
It is a synthetic mica that is substituted with more than one species. In the above formula, X is
Interlayer ions occupying the position of coordination number 12, such as K ⁺ , Na ⁺ ,
Li ⁺ , Rb ⁺ , Cs ⁺ , Tl ⁺ , Ca ²⁺ , Sr ²⁺ , Ba ²⁺
, Y is an octahedral ion occupying the position of coordination number 6, and is Mg ²⁺ , Li ⁺ , Ti ²⁺ , Zn ²⁺ , Al ³⁺ , T
i ³⁺ , Fe ³⁺ , Z is a tetrahedral ion occupying a position of coordination number 4, Si ⁴⁺ , Al ³⁺ , B ³⁺ , Fe ³⁺ , Be ²⁺ ,
It represents Zn ²⁺ and Ge ⁴⁺ .

The colored synthetic mica of the present invention includes, for example, fluorophlogopite, fluorotetrasilicic mica, fluoroteniolite and fluoromica, particularly fluorophlogopite tetrahedron (Z), octahedron (Y) and interlayer cations. Examples thereof include synthetic mica synthesized by substituting (X) with the colored element. The colored synthetic mica used in the present invention can be manufactured as follows. SiO of synthetic mica raw material
₂ , MgO, Al ₂ O ₃ , K ₂ SiF ₆ , KF and talc,
In addition to feldspar, Nb, Cu, Ho, Mn, Cr, Ni,
Oxides such as Pr, In, V, Ce, Co, Nd and Er are blended, and synthetic mica is prepared by a conventional method. The method for producing colored synthetic mica may be any method such as melt synthesis, hydrothermal synthesis, solid-phase reaction, reaction of talc with fluoride, silicofluoride, etc., but the melt synthesis method is particularly preferable because of its good crystallinity. Is preferred.

The colored synthetic mica powder used in the present invention is
It is preferable that the surface is smooth. Since synthetic mica has hard crystals and is difficult to cleave, it cannot be made into a scaly surface having a smooth surface by an ordinary method, and becomes an amorphous powder having a jagged cross section and a surface. In order to obtain a colored synthetic mica powder having a smooth surface, finely pulverizing a synthetic mica crystal lump that is easily peeled off. In order to obtain a colored synthetic mica crystal mass that is easy to peel off, for example, at the time of melting and synthesizing colored synthetic mica, it is preferable to add at least 1% or more of synthetic mica fine powder to the synthetic mica melt to coagulate and crystallize. . Such colored synthetic mica crystal lumps are easily peeled off, and the mica surface can be prevented from being scratched and scratched even if it is fragmented by a usual crushing machine such as a jaw crusher.

The colored synthetic mica strips described above are further processed by using, for example, a hammer mill, a roll mill, a ball mill or the like.
When finely pulverized to a size of about 0 micron or less, the fine particles of mica are subjected to excessive crushing force as they are, resulting in an amorphous powder having a jagged cross section and a surface. Therefore, for example, by adding a high-viscosity medium liquid such as glycerin, liquid paraffin, or ethylene glycol, the mica can be pulverized without roughening the surface. In the present invention,
It is also possible to use a mica having a smooth surface by heat treatment at 600 to 1350 ° C.

As the colored synthetic mica used in the present invention, it is preferable to use scaly particles having a diameter in the plane direction of 3 to 100 μm and a thickness of 0.05 to 1 μm. By using such a colored synthetic mica, the bright feeling of the pearl luster pigment is improved and the color becomes vivid. The aspect ratio of the colored synthetic mica is preferably 60 or more, and if it is smaller than this, the interference effect becomes insufficient and the gloss becomes difficult.

The color synthetic mica powder may be coated with a metal oxide by a known method. For example, the method of coating with titanium oxide is to suspend the synthetic mica powder in a dilute aqueous solution of titanic acid, heat it to 70 to 100 ° C., hydrolyze the titanium salt, and hydrate it on the synthetic mica powder. It can be manufactured by precipitating titanium oxide particles and then firing at a high temperature of 700 to 1000 ° C. Examples of the metal oxide used include oxides of titanium, zirconium, iron, chromium or vanadium. These can be used alone or in combination.

The metal oxide, preferably titanium dioxide, is preferably rutiled with a rutile agent such as tin chloride. Such rutile conversion improves the weather resistance of the pearlescent pigment. The pearly luster pigment of the present invention is a plastic which is mixed with various paints to form a paint composition or kneaded with various plastics in the same manner as in the conventional pearly luster pigment to express a unique pearly feeling. And
It can be used as a colorant for cosmetics or the like, or as a colorant for ink.

[0014]

The colored pearl luster pigment of the present invention comprises the interlayer (X),
Since the colored synthetic mica in which the cations of the octahedron (Y) and the tetrahedron (Z) are isomorphically substituted by a specific element is used as a substrate and the colored color is developed by interference, the interference color is the colored synthetic mica of the substrate. Of the conventional color
It develops a novel multicolored interference color that cannot be seen in luster pigments. In addition, in the shade part, it is a transparent light color like colored glass, and the color is not only different from the color of mica itself, but also a novel color that cannot be obtained by conventional pearl luster pigments. Express. The reason for this is not fully understood theoretically. Further, since the colored synthetic mica is used, the stability such as light resistance and heat resistance of the pearl luster pigment is remarkably improved as compared with the case of using the conventional coloring pigment.

[0015]

EXAMPLES Next, the present invention will be further described with reference to Examples and Comparative Examples, but the present invention is not limited to these Examples. Example 1 100 parts by weight of a formulation consisting of 18.2% by weight potassium silicofluoride, 28.2% by weight magnesium oxide, 11.9% by weight aluminum oxide and 37.0% by weight silicon dioxide, and 10 parts by weight niobium oxide. In addition, mixed well.
This mixture was placed in an alumina crucible and placed in an electric furnace at 1450.
After melting at 0 ° C., it was cooled in a furnace to obtain a light pink colored synthetic mica containing niobium.

After thinning the colored synthetic mica, 20 g of the colored synthetic mica classified to a particle size of 10 to 60 μm and 400 ml of water were put in a 1 liter glass container and stirred. Then, 200 ml of a titanyl sulfate solution (TiO ₂ 80 g / l) was added thereto, and the mixture was rapidly heated to 100 ° C. and reacted at this temperature for 3 hours. After completion of the reaction, filtration, washing with water, and drying,
The colored pearl luster pigment of the present invention was obtained by firing at 800 ° C. for 1 hour. This pearl luster pigment showed a reddish gold interference color in a clear lacquer, and a transparent light purple color like colored glass was developed in the shade portion.

Examples 2 to 13 In Example 1, instead of niobium oxide, copper oxide, holmium oxide, manganese oxide, chromium oxide, pruseodymium oxide, indium oxide, vanadium oxide, cerium oxide, cobalt oxide, neodymium oxide. The colored synthetic mica of the present invention was manufactured in the same manner except that erbium oxide was used. The color of the synthetic mica, the color of the shade portion of the pearl luster pigment and the interference color (color in the clear lacquer) obtained are shown in Table 1 below. Comparative Example 1 A pearlescent pigment was obtained in the same manner as in Example 1 except that natural muscovite was used instead of the colored synthetic mica containing niobium. Table 1 below shows the color of the shade portion and the interference color (color in the clear lacquer) of the obtained pearl luster pigment.

[0018]

[Table 1]

Example 14 After the colored synthetic mica containing pruseodymium oxide obtained in Example 7 was exfoliated, 20 g of the colored synthetic mica classified to a particle size of 10 to 60 μm, 400 ml of water and a titanyl sulfate solution (TiO ₂ 80 g) were used. Per liter) 335 ml and the same procedure as in Example 1 was performed.
A lustrous pigment was obtained. The color and interference color (color in the clear lacquer) of the shade portion of the obtained pearl luster pigment are
The results are shown in Table 2 below.

Example 15 Colored synthetic mica 2 containing cobalt obtained in Example 11
The same procedure as in Example 1 was carried out using 0 g of 235 ml of a titanyl sulfate solution (TiO ₂ 80 g / liter) to obtain a pearlescent pigment of the present invention. Table 2 below shows the color and interference color (color in the clear lacquer) of the shade portion of the obtained pearl luster pigment. Example 16 Using 20 g of the colored synthetic mica containing neodymium obtained in Example 12, a titanyl sulfate solution (TiO ₂ 80 g /
275 ml was used in the same manner as in Example 1 to obtain a pearlescent pigment of the present invention. The obtained par
Table 2 below shows the colors of the shade portion and interference colors (colors in the clear lacquer) of the luster pigment.

[0021] Using the colored synthetic mica 20g containing erbium obtained in Example 17 Example 13, titanyl sulfate solution (TiO ₂ 80 g /
L) In the same manner as in Example 1 using milliliter, the pearlescent pigment of the present invention was obtained. The obtained par
Table 2 below shows the colors of the shade portion and interference colors (colors in the clear lacquer) of the luster pigment. Comparative Example 2 Using 20 g of natural muscovite, a titanyl sulfate solution (Ti
O ₂ 80 g / liter) 335 ml,
A conventional pearlescent pigment was obtained in the same manner as in Example 1. Table 2 below shows the color and interference color (color in the clear lacquer) of the shade portion of the obtained pearl luster pigment.

Comparative Example 3 Using 30 g of the natural muscovite powder used in Comparative Example 2,
400 ml of water was added and stirred. Then, in this, a titanyl sulfate solution (TiO ₂ 80 g / liter)
200 ml was added and the mixture was rapidly heated to 100 ° C. and reacted at this temperature for 3 hours. After filtration and washing with water, 570 ml of water and ferric sulfate solution (Fe ₂ O ₃ = 100 g / l) were added to the total amount of the titanium-coated mica obtained.
Add 0 ml and then gradually add urea to adjust the pH.
It was set to 2.0. The solution is rapidly heated to 100 ° C,
The reaction was performed for 1 hour. After completion of the reaction, filtration and washing with water
After drying at ℃, it was baked at 800 ℃ for 1 hour to obtain a colored pearl luster pigment. Table 2 below shows the color and interference color (color in the clear lacquer) of the shade portion of the obtained pearl luster pigment.

[0023]

[Table 2]

[0024]

As described above, according to the present invention, the conventional power
By using a colored synthetic mica that has never been used as a substrate for a luster pigment, the interference color is combined with and amplified by the color of the colored synthetic mica of the substrate, which is completely unseen in conventional pearl luster pigments. In addition to exhibiting a novel multi-color interference color, the shade portion develops a color different from the color of colored synthetic mica that is not seen in conventional pearl luster pigments, and the color is transparent. Since it is a light color, it is extremely beautiful. Therefore, the colored pearl luster pigment of the present invention expresses a novel bright feeling which is completely different from that of the conventional colored pearl luster pigment, and also has light resistance and heat resistance. Since it is extremely stable, it exerts a great effect as a coloring agent for paints, cosmetics, inks, plastics and the like.

Claims (6)

[Claims] 1. A metal mica coated synthetic oxide mica.
In the luster pigment, the synthetic mica has Nb, Cu, H at one or more positions of interlayer, octahedral and tetrahedral cations.
o, Mn, Cr, Ni, Pr, In, V, Ce, Co,
A pearly luster pigment, which is a colored synthetic mica containing at least one selected from the group consisting of Nd and Er. 2. The pearlescent pigment according to claim 1, wherein the surface of the particles of the synthetic mica is made smooth. 3. The synthetic mica has a surface direction diameter of 3 to 1
The pearlescent pigment according to claim 1 or 2, which is a scaly particle having a size of 00 µm and a thickness of 0.05 to 1 µm. 4. The average aspect ratio of the synthetic mica is 6
The pearl luster pigment according to any one of claims 1 to 3, which is 0 or more. 5. The method according to claim 1, wherein the metal oxide is titanium dioxide, and the titanium dioxide is rutile-ized with tin chloride.
The pearlescent pigment according to any one of 4 above. 6. The base material containing the pearl luster pigment is paint, cosmetics, ink or plastic.
The pearl luster pigment according to any one of to 5.