JPS6155542B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a granular paint that has excellent solubility during use and a method for producing the same.

Granular paints are easier to use, easier to carry than paste paints in tubes, and have excellent stability over time, such as the pigment and liquid solution not separating when left for long periods of time. Compared to solid paints, which are made by drying and pulverizing paste-like materials and solidifying them, they are superior in terms of solubility in water during use, and demand for them has been increasing in recent years.

A conventional granular paint is disclosed in Japanese Patent Publication No. 54-5730, but this invention had a problem, particularly in solubility in water during use.

The factors that determine the solubility in water during use are whether aggregation occurs between pigment particles and the solubility of the water-soluble thickening agent. It seems that they are trying to improve the solubility by mixing the extender pigment at the same time, but long-term research has shown that there is a limit to the solubility when simply mixing the water-soluble paste, the pigment, and the extender pigment. The result is clear.

Therefore, the present inventors discovered that in order to prevent the pigment agglomeration phenomenon described above as much as possible and to improve the solubility of the water-soluble thickening agent, it is necessary to make the pigment, water-soluble thickening agent, and extender pigment into a special form. The present invention was completed based on this idea. Note that the term "porous substance" below includes porous extender pigments and other porous substances.

The present invention, based on the above idea, provides a granular paint containing at least a water-soluble paste whose surface has been treated with a porous substance, a porous substance whose surface has been treated with a pigment, and a nonionic surfactant. In the first invention, the surface of the water-soluble glue powder is treated with a porous substance, the porous substance is attached to the surface of the water-soluble glue powder by at least frictional charging, and the surface of the porous substance is After treating with a pigment and adding at least water and a nonionic surfactant to a mixture of this treated product and the surface-treated product of the water-soluble glue, an aliphatic monohydric alcohol having a carbon number of 5 or less is added and mixed. The second invention is a method for producing a granular paint by obtaining a plasticized moisture-adjusted mixture, then granulating it in a granulator, and drying it.

Each material of the granular paint of the present invention will be explained below.

Pigments are used as colorants, and include well-known pigments such as titanium oxide, zinc white, carbon black, Hansa Yellow G, Hansa Yellow 10G, ocher, hand dyer, red iron, Laked, Carmine 3B, ultramarine blue, phthalocyanine blue, and chrome green. Pigments can be used alone or in combination as appropriate, but metal powder pigments such as brass powder and aluminum powder, which are easily rusted by water, are not preferred unless treated to prevent rust.

Water-soluble thickeners are used for the sole purpose of providing fixation to the coating surface such as paper, acting as a shape retainer to prevent the paint from turning into powder, and improving color development. natural thickening agents such as gum arabic, gum tragacanth, molasses algae, and sodium alginate; cellulose derivative thickening agents such as carboxymethyl cellulose (CMC), ethyl cellulose, and hydroxyethyl cellulose; processed thickening agents such as Britetice gum, dextrin, and dialdehyde starch; , polyvinylpyrrolidone, polyvinylmethylal, polyacrylamide, and other synthetic thickeners can be appropriately used alone or in combination.

Porous materials are used for the sole purpose of making paste-like materials plastic, making them easier to granulate, and making it easier for water to penetrate during use, such as diatomaceous earth, silica, and white carbon. , bentonite, precipitated barium sulfate, chalk, kaolin, alumina white, magnesium silicate, magnesium oxide, magnesium carbonate, magnesium hydroxide, etc. can be used individually or in combination as appropriate. When used as a paint, this porous material has an average particle diameter larger than that of the pigment, considering the roughness, tackiness, and roughness of the applied surface.
Also, it is smaller than the water-soluble glue powder, preferably
A thickness of about 10 to 20μ is good.

In the present invention, a particularly important point is that the pigment, water-soluble paste, and porous substance are used in a special manner as described above, that is, the surface of the water-soluble paste is treated with the porous substance, It is used in a form in which both are attached at least by triboelectrification, and in a form in which the surface of the porous material is treated with a pigment. The forms of these water-soluble pastes, porous materials, and pigments are shown in a conceptual diagram (FIG. 1).
In FIG. 1, reference numeral 1 indicates a water-soluble paste, 2 indicates a porous material, and 3 indicates a pigment.

Moreover, FIG. 2 simply shows a conceptual diagram when a pigment, a water-soluble paste, and a porous substance are mixed, and the symbols correspond to the materials in FIG. 1.

The reason why the solubility improves depending on the form of the material is not clear, but it is thought to be as follows.

In other words, pigment particles are attached to the surface of a porous material that has a rough surface due to its porous nature, so when water is added during use, the surface of the pigment is wetted by the water and at the same time The rough surface of the porous substance exhibits a capillary action and draws the pigment wetted with water, preventing aggregation between pigment particles as much as possible, and the porous substance on the surface of the water-soluble glue. Because it is firmly attached, when water is added during use, the porous material on the surface quickly absorbs a large amount of water, and this water dissolves the water-soluble glue from the entire circumference. This is thought to be due to the improved solubility of the adhesive paste.

Nonionic surfactants are used to promote water penetration into granules and to easily disintegrate them, and polyoxyethylene alkyl ether, polyoxyethylene alkyl phenol ether, etc. are most suitable. It is. If other types of surfactants are used, the penetrating effect will be excessive, so when drawing on paper, the paint will penetrate into the paper, resulting in poor color development, resulting in undesirable results. Also, when stirring with a paint brush, there is a problem of bubbling, making it difficult to move the brush smoothly, and favorable results cannot be obtained. is possible if the usage amount is considered.

In addition, aliphatic monohydric alcohols having 5 or less carbon atoms are
It is used to increase granulation efficiency, and methyl alcohol, ethyl alcohol, isopropyl alcohol, amyl alcohol, etc. can be used alone or in combination as appropriate. still,
Since this aliphatic monohydric alcohol is used from the viewpoint of granulation efficiency, it may or may not be present in the final product.

In addition to the above materials, moisten the application surface moderately,
Adding humectants such as glycerin, sorbit, and glycol to prevent cracks,
In addition, in order to further promote water absorption, a porous material similar to the porous material used above may be separately added, and further, in order to further improve the solubility when water is added, Disintegrants used in food, medicine, detergents, etc. can also be added.

The amounts used for each of the above materials are: pigment 15-50% by weight, water-soluble glue 15-30% by weight, porous material 25-50% by weight, and water 0-15% by weight. , nonionic surfactant 2-7% by weight, carbon number 5
The following aliphatic monohydric alcohol content is preferably 0 to 5% by weight.

Next, the manufacturing method will be described.

First, a water-soluble paste and a method for surface treatment of porous materials will be described. Surface treatment of water-soluble glue can be carried out by placing water-soluble glue powder and porous material powder in a dispersion machine such as a Henshil mixer or a ball mill, and stirring thoroughly. The porous material is attached to the surface by triboelectrification, but in addition to adhesion by triboelectrification, adhesion by microcapsule technique, which has a strong mechanical and physical color and is caused by contact between powders, may also be included.
In addition, for surface treatment of porous materials, the porous material and the pigment are placed in a dispersion machine such as a Henshil mixer or a ball mill, and thoroughly stirred to remove the deep mechanical and physical color caused by contact between the two. This is done by deposition by microcapsule technique. The pigment used in this treatment may be either previously treated or untreated.

Next, at least water and a nonionic surfactant are added to the above-mentioned treated material and mixed as necessary.Although it is difficult to separate adhesion due to frictional charging during this mixing, water-soluble glue and It is important to adopt a mixing method that does not cause excessive separation of the porous material and the pigment from the porous material, thereby preventing the initial objective from being achieved.

Furthermore, an aliphatic monohydric alcohol having 5 or less carbon atoms is added and mixed, but it is important to prevent excessive separation from occurring in this mixing as well, as described above. The desired granular paint can be obtained by granulating these mixtures in a granulator and drying them.

Next, the present invention will be explained based on examples. In addition, "parts" in the examples indicate parts by weight.

Example 1 70 parts of gum arabic powder and 80 parts of diatomaceous earth were thoroughly stirred using a Henshil mixer, and the diatomaceous earth was adhered to the surface of the gum arabic powder (when this state was confirmed with a microscope, most of it was due to frictional electrification). (It was partly a mechanical and physical adhesion with a dark color). In addition, 40 parts of diatomaceous earth and 40 parts of Hansa Yellow G were sufficiently stirred using a Henshil mixer, and the pigment (Hansa Yellow G) was adhered to the surface of the diatomaceous earth (when this condition was confirmed with a microscope, the mechanical and physical color was (There was a thick layer of adhesion).

Next, the above surface-treated products were mixed, and into the mixture, 45 parts of water and 10 parts of Neugen ET170 (manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd., nonionic surfactant) were added and stirred. Then add 50 parts of ethyl alcohol and stir to obtain a plastic wet mixture,
This product is extruded and granulated using a wet granulator (manufactured by Fuji Paudal Co., Ltd.) using a screen pore size (0.8 mm to 1.2 mm), and dried at around 100°C for about 20 to 60 minutes, resulting in a yellow granular paint. was able to obtain. To check the solubility of the resulting paint, 50 g of the paint was placed in a 300 ml beaker containing 50 c.c. of water and allowed to stand for 5 minutes without stirring, and no aggregates such as pigment were present. .

Comparative Example Gum arabic powder...70 parts Diatomaceous earth...120〃 Hansa Yellow G...40〃 were placed in a kneader and thoroughly stirred and mixed until uniform, and then 50 parts of ethyl alcohol was sprayed using a sprayer. Continue stirring to form a lump.
This lump was transferred to a granulator (manufactured by Fuji Paudal Co., Ltd.), extruded through a metal plate with many holes with a diameter of 0.8 mm, and formed into granules.
It was dried at 60°C for 2 hours to obtain a yellow granular paint.
When the solubility of this paint was confirmed by the same method as in Example 1, aggregates of about 80 to 150 mesh were confirmed.

Example 2 A red granular paint could be obtained through the same process as in Example 1, although only a blending example is shown.

Dextrin...70 parts CMC (manufactured by Daiichi Kogyo Seiyaku Co., Ltd., Celogen 7A)
...3〃 Magnesium silicate ...80〃 Diatomaceous earth ...40〃 Carmine 3B ...40〃 Water ...40〃 Dispersed pigment (colanyl red - manufactured by FGR Hoechst (contains water and nonionic surfactant)) ... ...12〃 Glycerin ...10〃 Isopropyl alcohol ...55〃 Example 3 Only a formulation example is shown, but a brown granular paint could be obtained by the same process as in Example 1.

Dextrin...30 parts Gum arabic...30 Diatomaceous earth...60 Diatomaceous earth...40 Alumina white...20 Red red iron...90 Water...30 parts Neugen ES-140 (Daiichi Kogyo Seiyaku Co., Ltd.) ), nonionic surfactant) ...10 Sorbitol ...10 Denatured alcohol ...60 The solubility of the granular paints obtained in Examples 2 and 3 above was as in Example 1. It was dissolved in water in an extremely short time without stirring, and no aggregates were formed.

[Brief explanation of the drawing]

Fig. 1 is a conceptual diagram showing the forms of the water-soluble paste, porous material, and pigment according to the present invention, and Fig. 2 shows the conventional one. It is a conceptual diagram showing the form when mixed. 1...Water-soluble glue, 2...Porous material, 3...
...pigment.

Claims (1)

[Scope of Claims] 1. A granular paint containing at least a water-soluble paste whose surface has been treated with a porous substance, a porous substance whose surface has been treated with a pigment, and a nonionic surfactant. 2. Treating the surface of the water-soluble glue powder with a porous substance to adhere the porous substance to the surface of the water-soluble glue powder by at least frictional charging, and treating the surface of the porous substance with a pigment, After adding at least water and a nonionic surfactant to a mixture of this treated product and the surface-treated product of the water-soluble glue, an aliphatic monohydric alcohol having 5 or less carbon atoms is added and mixed to make it plastic. A method for producing granular paint by obtaining a moist mixture, then granulating it in a granulator, and drying it.