JP2898890B2 - Pigment aqueous dispersion composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aqueous pigment dispersion composition, and more particularly, to a long-term stability, excellent compatibility with various binders when used in paints, etc., and a possibility of deterioration in physical properties of a coating film. And water-free pigment dispersion compositions.

[0002]

2. Description of the Related Art In recent years, solvent-based pigments have been dispersed in the production of pigment colorants for various paints and the like due to various factors such as handling problems, work environment problems, and measures to reduce VOCs resulting from the preservation of the global environment. There is a large flow from the body to the aqueous pigment dispersion. Also, due to the diversification of various needs such as paints, pigment colorants also have problems such as low-volume production of various kinds, complicated toning work, etc. There is a big trend to improve productivity and efficiency of colorants, paints and the like.

Against this background, there is a strong demand for water-based pigment dispersions of primary colors in manufacturers of colorants and paints. Particularly in the case of inorganic pigments, it is very difficult to produce a stable pigment dispersion because the specific gravity of the inorganic pigment is large and the particle size is large.

[0004]

Problems to be Solved by the Invention Conventionally, from the viewpoint of production rationalization, it has been studied to prepare a toning primary color and manufacture each colorant using the same. Are roughly divided into two methods. One is a type in which a pigment is dispersed using a surfactant, and the other is a type in which a pigment is dispersed using a resin. These methods are employed depending on the purpose, but all have problems at present.

For example, in the case of (1) a type in which a pigment is dispersed using a surfactant, the compatibility of a paint or the like can be considerably widened, but the physical properties of a film formed with the surfactant are adversely affected. . In other words, drying, water resistance,
This results in a decrease in weather resistance, solvent resistance, chemical resistance, coating strength, and the like. (2) In a type in which a pigment is dispersed using a resin,
Difficulty in compatibility with partner binder. For this reason, there is a problem that the pigment is aggregated and the gloss of the formed coating film is reduced.

In other words, if the compatibility is to be improved, the influence on the physical properties of the formed film is increased, and if the compatibility is not affected, the film can be applied only to a limited use. In addition, the inorganic pigment having a large specific gravity and a large particle diameter is obtained by the above-described method without sedimentation of the pigment.
It is very difficult to provide long-term stability.
Accordingly, an object of the present invention is to provide a long-term stability and excellent compatibility with various binders when used in paints and the like, and there is no risk of deterioration in coating film properties. An object of the present invention is to provide a pigment water dispersion composition which can be suitably produced and used.

[0007]

The above object is achieved by the present invention described below. That is, the present invention is a pigment water dispersion composition comprising an inorganic pigment having a specific gravity of 3 or more, water, and a water-lubricating layered clay mineral.

[0008]

According to the present invention, by dispersing an inorganic pigment having a specific gravity of 3 or more in water containing a water-swellable layered clay mineral, the dispersion is stable and does not form a hard cake even during long-term storage. The present invention provides an aqueous pigment dispersion composition having excellent compatibility with various binders such as paints and the like, and which does not impair the physical properties of the coating film.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Next, the present invention will be described in more detail with reference to preferred embodiments. The inorganic pigment used in the present invention is used to develop various properties such as coloring, thickening, absorption of ultraviolet rays, absorption and reflection properties of infrared rays, corrosion resistance, heat resistance, and design properties in a coating film. It is.

The inorganic pigments having a specific gravity of 3 or more used in the present invention mainly include metal oxide pigments. For example, titanium oxide, red iron oxide, yellow iron oxide,
Black iron oxide, ferrite, chromium oxide, aluminum oxide, zirconium oxide, manganese oxide, cobalt oxide,
Barium sulfate, zinc oxide, nickel oxide, antimony oxide, lanthanum oxide, cerium oxide, copper oxide, magnesium oxide, bismuth oxide, zinc hydroxide, cerium hydroxide,
Lanthanum hydroxide, cobalt hydroxide, nickel hydroxide, manganese hydroxide, vanadium oxide, zinc carbonate, cobalt carbonate, barium carbonate, magnesium carbonate, titanium yellow, cobalt green, titanium cobalt green, cobalt blue, cobalt aluminum chrome blue, cobalt Chrome green, Cerulean blue, cobalt zinc silica blue, copper chrome black, copper-iron manganese black,
Examples thereof include chrome tin pink, chrome alumina pink, vanadium blue, praseodymium yellow, bismuth yellow vanadate, Victoria green, cobalt silicate, and zirconium silicate.

The average particle size or average length of these pigments is as follows:
It is usually 0.01 to 10 μm, preferably 0.1 to 5 μm. The proportion of the pigment in the obtained pigment aqueous dispersion composition is 25 to 200 parts by weight, preferably 30 to 150 parts by weight, per 100 parts by weight of water. If the pigment is less than 25 parts by weight, the production efficiency of the aqueous pigment dispersion composition is poor and uneconomical,
If the amount exceeds 200 parts by weight, it becomes difficult to disperse the pigment in water, which is not preferable.

Next, examples of the water-swellable layered clay mineral used in the present invention include water-swellable mica and water-swellable smectite clay mineral, and include natural products and synthetic products. Smectite clay minerals are a group of water-swellable clay minerals, for example, montmorillonite, saponite, hectorite, beidellite, nontronite, saukolite,
Examples include stepensite and bentonite. Examples of these water-swellable smectite clay minerals include Becam, Becam T, Becam B, Bangel B (manufactured by Vanderbilt), Benton EW, Benton MA, Benton AD (manufactured by Leox) Kunipia F,
Kunipia G, Kunigel VA, Smecton SA (manufactured by Kunimine Kogyo Co., Ltd.), Lucentite SWN, Lucentite SWF (manufactured by Corp Chemical Co., Ltd.), San bentonite KG-1, San bentonite K-1, San bentonite KA -1 (manufactured by Sun Bentonite Industry Co., Ltd.). Examples of the water-swellable mica include Somasif EW (manufactured by Corp Chemical Co., Ltd.).

These water-swellable mica and water-swellable smectite clay minerals may be used alone or in combination of two or more, and the mixing ratio can be freely selected. The content of these components in the composition of the present invention can be appropriately selected.
It is sufficient that the amount is from 01 to 5 parts by weight, preferably from 0.1 to 3 parts by weight.

When a natural product is used as the water-swellable mica and the water-swellable smectite clay mineral, quartz, cristobalite, feldspar, zeolite, dolomite and the like may be variously contaminated in addition to the water-swellable mineral. is there. If the amount of these impurities is large, these components settle after the pigment is dispersed, which may impair the uniformity of the pigment dispersion composition.Therefore, purified products are used as the water-swellable mica and the water-swellable smectite clay mineral. It is more preferable to use.

The water-swellable clay mineral used in the present invention forms a stable aqueous colloid. The aqueous colloidal dispersion thus formed has a high structural viscosity and exhibits reversible thixotropic fluidity against shear stress. For this reason, sedimentation of the pigment during storage of the obtained pigment aqueous dispersion composition is suppressed, and when the pigment aqueous dispersion composition is used, fluidity is expressed in the pigment aqueous dispersion composition by an operation such as stirring, so that the pigment aqueous dispersion composition is easy to handle. Become.

The water-swellable clay mineral also acts as a dispersant with respect to the metal oxide pigment used mainly as an inorganic pigment in the present invention. For this purpose, it is more preferable to prepare a water-dispersed pigment composition by mixing and co-dispersing a pigment, water and a water-swellable layered clay mineral. By doing so, it is possible to obtain a pigment aqueous dispersion composition having a high pigment concentration as compared with the case where the pigment is dispersed only with water, and furthermore, the swelling, cleavage and dispersion of the water-swellable layered clay mineral are completely completed. The same effect can be exerted even if the amount of the water-swellable layered clay mineral is reduced.

This is advantageous in two respects. One is that the pigment water dispersion composition can have a high pigment concentration, which can be applied to a wide range of colorant formulations and also reduces the cost of transportation by reducing the proportion of water in the composition. Also leads. The other is that by adding a small amount of a water-swellable layered clay mineral, the pigment can be dispersed and its concentration can be increased, so that the dispersion efficiency can be increased and the cost can be reduced.

The inorganic pigment and the water-swellable layered clay mineral constituting the aqueous pigment dispersion composition of the present invention are both inorganic substances, and all the compositions of the present invention are composed of inorganic substances. This is the reason that the aqueous pigment dispersion composition of the present invention is essentially excellent in heat resistance and durability, but also means that the components existing in water are less likely to deteriorate. ing. For this reason, the aqueous pigment dispersion composition of the present invention has not only the stability of no sedimentation of the pigment but also the stability of no deterioration of each component during storage.

Therefore, the aqueous pigment dispersion composition of the present invention can be used in various applications without impairing the properties of the inorganic pigment. The aqueous pigment dispersion composition of the present invention is not only colored, but also required in fields requiring heat resistance, in fields requiring durability, and functional properties of pigments (for example, absorption of ultraviolet rays, absorption / reflection of infrared rays, corrosion resistance, etc.). ) Can be used as appropriate in a wide range of fields, such as fields requiring). For example, the fields to which the aqueous pigment dispersion composition of the present invention is applied include paints, inks, coloring agents for cement, coloring agents for building materials, coloring agents for paper, and paints. Further, the composition of the present invention can be processed and used for these purposes.

To prepare the pigment aqueous dispersion composition of the present invention, for example, a sand mill, a ball mill, a colloid mill,
Using a visco mill, dyno mill, spike mill, etc.
It is performed by kneading each component with water and grinding. By setting appropriate conditions, a uniform and finely dispersed aqueous pigment dispersion composition of the present invention can be obtained.

[0021]

Next, the present invention will be described more specifically with reference to examples and comparative examples. Parts and percentages in the text are based on weight unless otherwise specified. Example 1 To 60 parts of water, 40 parts of titanium oxide R-960 (manufactured by DuPont) and 0.5 part of Benton EW (manufactured by Leox) were blended, and mixed with glass beads using a paint shaker (manufactured by Red Devil). After dispersion for 1 minute, a pigment aqueous dispersion (1) having a pigment content of 40% was obtained. The dispersion is subjected to a light transmission centrifugal sedimentation type particle size distribution analyzer (SA-C manufactured by Shimadzu Corporation).
When the particle size distribution was measured over P4), it was found to be a finely dispersed liquid dispersion having an average particle diameter of 0.33 μm. Observation of the state of the dispersion after standing for 3 months showed that the dispersion was stable without formation of a hard cake, and there was no change in the dispersibility of the pigment.

Example 2 For 40 parts of water, 40 parts of titanium oxide R-960, 0.4 of Somasif ME-100 (manufactured by Corp Chemical Co., Ltd.) 0.4
And a pigment aqueous dispersion (2) having a pigment content of 40% was obtained in the same manner as in Example 1. When the particle size distribution of this dispersion was measured, the average particle size was 0.35 μm. Observation of the state of the dispersion after standing for 3 months showed that the dispersion was stable without formation of a hard cake, and there was no change in the dispersibility of the pigment.

Example 3 For 60 parts of water, 40 parts of Todacolor 130ED (manufactured by Toda Kogyo KK) and 40 parts of Benton MA (manufactured by Leox)
In the same manner as in Example 1, a pigment aqueous dispersion (3) having a pigment content of 40% was obtained. When the particle size distribution of this dispersion was measured in the same manner as in Example 1, the average particle size was 0.45 μm.
Met. Observation of the state of the dispersion after standing for 3 months showed that the dispersion was stable without formation of a hard cake, and there was no change in the dispersibility of the pigment.

Example 4 50 parts of titanium oxide R-960 and 0.4 parts of smecton SA (manufactured by Kunimine Industries Co., Ltd.) were mixed with 50 parts of water, and the pigment content was 50% as in Example 1. A pigment aqueous dispersion (4) was obtained. When the particle size distribution of this dispersion was measured in the same manner as in Example 1, the average particle diameter was 0.31 μm.
When the state of the dispersion after standing for 3 months was observed,
It was stable without the formation of a hard cake, and there was no change in the dispersibility of the pigment.

Example 5 To 50 parts of water, tie peroxide yellow # 9151
50 parts (Dainichi Seika Kogyo Co., Ltd.) and 0.7 parts of Benton MA (Rheox) were blended to obtain a pigment aqueous dispersion (5) having a pigment content of 50% in the same manner as in Example 1. . When the particle size distribution of this dispersion was measured in the same manner as in Example 1, the average particle diameter was 0.75 μm. Observation of the state of the dispersion after standing for 3 months showed that the dispersion was stable without formation of a hard cake, and there was no change in the dispersibility of the pigment.

Example 6 A mixture of 50 parts of water and typiloxide green # 9320
(Dainichi Seika Kogyo Co., Ltd.) 50 parts, Lucentite S
0.5 parts of WN (Corp Chemical Co., Ltd.)
A pigment aqueous dispersion (6) having a pigment content of 50% was obtained in the same manner as in Example 1. When the particle size distribution of this dispersion was measured in the same manner as in Example 1, the average particle size was 0.7 μm. Observation of the state of the dispersion after standing for 3 months showed that the dispersion was stable without formation of a hard cake, and there was no change in the dispersibility of the pigment.

Example 7 To 50 parts of water, tie peroxide black # 9510
(Dainichi Seika Kogyo Co., Ltd.) 50 parts, Lucentite S
1.0 part of WN (Corp Chemical Co., Ltd.)
A pigment aqueous dispersion (7) having a pigment content of 50% was obtained in the same manner as in Example 1. When the particle size distribution of this dispersion was measured in the same manner as in Example 1, the average particle diameter was 0.52 μm. Observation of the state of the dispersion after standing for 3 months showed that the dispersion was stable without formation of a hard cake, and there was no change in the dispersibility of the pigment.

Example 8 To 60 parts of water, 50 parts of Todacolor KN-320 (manufactured by Toda Kogyo Co., Ltd.) and 0.5 parts of Lucentite (manufactured by Corp Chemical Co., Ltd.) were blended. In the same manner as in the above, a pigment aqueous dispersion (8) having a pigment content of 50% was obtained. When the particle size distribution of this dispersion was measured in the same manner as in Example 1, the average particle size was 0.45 μm. Observation of the state of the dispersion after standing for 3 months showed that the dispersion was stable without formation of a hard cake, and there was no change in the dispersibility of the pigment.

Comparative Example 1 Forty parts of water was mixed with 40 parts of titanium oxide R-960 (manufactured by DuPont) to obtain a pigment aqueous dispersion (1) having a pigment content of 40% in the same manner as in Example 1. In this dispersion, the pigment had a tendency to agglomerate, and a few days later, it became a hard cake.

Comparative Example 2 50 parts of Todacolor 130-ED (manufactured by Toda Kogyo Co., Ltd.) were mixed with 50 parts of water and dispersed in the same manner as in Example 1. It was high in clay, non-uniformly dispersed, and very difficult to separate from glass beads. Further, in the dispersion liquid taken out, the sedimentation of the pigment was fast, and there was a tendency to form a hard cake.

Comparative Example 3 50 parts of water was mixed with 50 parts of dipyroxide # 9151 yellow (manufactured by Dainichi Seika Kogyo Co., Ltd.).
In the same manner as in the above, a pigment aqueous dispersion having a pigment content of 50% was obtained. In this dispersion, the pigment has a tendency to aggregate, and the sedimentation of the pigment is fast,
A few days later, it had become a hard cake.

[0032]

As described above, according to the present invention, an inorganic pigment having a specific gravity of 3 or more is dispersed in water containing a water-swellable layered clay mineral, whereby the dispersion is stable and the hard cake can be preserved even during long-term storage. A water-dispersed pigment composition that does not form, has excellent compatibility with various binders such as paints, and does not impair the physical properties of a coating film is provided.

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Claims (4)

(57) [Claims] 1. A pigment water dispersion composition comprising an inorganic pigment having a specific gravity of 3 or more, water and a water-lubricating layered clay mineral. 2. The aqueous pigment dispersion composition according to claim 1, comprising 25 to 200 parts by weight of an inorganic pigment having a specific gravity of 3 or more based on 100 parts by weight of water. 3. The pigment aqueous dispersion composition according to claim 1, which contains 0.01 to 5 parts by weight of a water-swellable layered clay mineral with respect to 100 parts by weight of water. 4. The pigment water dispersion composition according to claim 1, wherein the water-lubricating layered clay mineral is selected from water-swellable mica and a water-swellable smectite clay mineral.