JPH07247450A - Aqueous multi-color coating composition - Google Patents

Abstract

PURPOSE:To obtain an aqueous multi-color coating composition capable of forming a smooth and multicolored coating film clearly and readily observable with the eye, having slight superimposition in spraying in comparison with ordinary coating, reduced unevenness for the size of an aggregate, opacifying the inferiority of a substrate or a material, finishing the coating film smoothly. CONSTITUTION:This aqueous multi-color coating composition is obtained by using scaly gelatinous colored particles and colored or pigmented spherical fine particles as a colored aggregate dispersed in an aqueous medium. Plural kinds of particles having different color tones are used as the gelatinous colored particles. Spherical fine particles having a color tone different from that of the scaly gelatinous colored particles can be used as the spherical fine particles. The gelatinous colored particles are those obtained by gelatinizing a viscous colloidal solution composed of an aqueous solution of a colored water-soluble polymer compound and a synthetic resin emulsion into a particulate state. Organic or inorganic balloons are used as the spherical fine particles.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a water-based multicolor coating composition which can be visibly and easily visible to form a multicolored and smooth coating. More specifically, the present invention relates to an aqueous multicolor coating composition characterized by a combination of scale-like gel colored particles and colored or colored spherical fine particles as a colored aggregate. The water-based multicolor coating composition of the present invention has less overlap during spraying compared to the case of general coating, has less unevenness for the size of the aggregate, conceals the badness of the base material or the material and is a smooth film. Is finished.

[0002]

2. Description of the Related Art A multicolored paint or a multicolored paint is a paint that can be applied once to give a coating in which various colors are interspersed in spots or mottled patterns.
There are some pigments that use incompatible and colored polymer particles or silica sand in which a coating material of a different color that does not dissolve in the coating material is suspended is used as a colored aggregate. Since it is possible to obtain a coating film having various design characteristics depending on the combination of color tone and gloss, it is applied to home appliances, building materials and the like.

A water-based multicolor pattern paint, that is, a water-based multicolor coating composition, is a synthetic resin dissolved in an organic solvent which is incompatible as a medium in a water medium, or a high polycondensate with a fat or a fatty acid. It is a composition obtained by suspending a viscous synthetic resin to which an appropriate colorant is added. This composition is sprayed or coated on the coated surface with a trowel or spatula.

Conventionally, an aqueous multicolor coating composition has a composition in which a pigment or a colorant is dispersed in a resin dissolved in an organic solvent as a medium, for example, because it is suspended and dispersed in an aqueous solvent body in the form of particles. During spray coating, it is convenient because it can be visually recognized as chromatic particles several times as large as the nozzle diameter due to the spread due to the sudden pressure when it is discharged from the nozzle and reaches the surface to be coated, and the flow spreadability in the process of drying. However, the state of the coated chromatic particles is non-uniform, and it is difficult to control the size of the particles, and there is a problem that it is not necessarily a beautiful multicolored paint.

Further, as an aqueous multicolor coating composition, there is a composition in which two or more colors of natural stones or artificially colored fine particles of 2-3 mm or less are dispersed. Since it is not possible to expect deformation of each of the fine color particles when the nozzle is ejected, it is desirable that the particle diameter be about 1/3 or less of the nozzle diameter. For example, if the composition of colored natural stone or artificial colored particles having a particle diameter of 2 mm is to be spray-coated, it is necessary to use a spray gun having a diameter of 5 to 6 mm for coating. Therefore, the amount of 1 m ² of the coating material used reaches ² to 3 kg.

Recently, many kinds of multicolored coatings have been developed by combining the colors of spherical organic or inorganic colored particles, synthetic compounds such as glass balun, natural inorganic calcined balun, synthetic resin balun, and the like. A common demand for these covering means is a beautiful colorful pattern,
Economical, easy work and uniform finish,
As a coating means, coating by spraying is generally used.

However, the spherical particles themselves are not deformed when ejected from the nozzle like the fine colored particles such as the above natural stones. Therefore, if an easy and stable spraying operation is expected, particles having a diameter of about 1/2 of the nozzle diameter are used. There is a constraint in that the diameter must be used. For example, the nozzle diameter is 1.5m
Assuming that the particle size is fixed to m, the particle size of each color fine particle such as the natural stone is 0.5, and the particle size of the colored spherical particle is about 0.7 mm.

As a result, even if multiple colors are combined or a multicolored coating composition is formed, each color is not visible after coating, and the original meaning of the multicolored coating is lost, and an iridescent sensation is exhibited. It's just color. Therefore, if a particle size (1 to 3 mm) that is easy to visually recognize is adopted, irregularities associated with a large particle size are generated in the formed film, which is not aesthetically appropriate. Also, the amount of the coating agent used is several times or ten times, which is extremely economically inappropriate.

[0009]

The present invention is clearly
Moreover, it is an object of the present invention to provide a water-based multicolored coating composition that can be easily visually recognized to form a multicolored and smooth coating. Another object of the present invention is to provide a water-based multicolor coating composition which can be sprayed economically, easily in work, and can have a uniform multicolored coating with a uniform finish.

[0010]

Means for Solving the Problems In order to solve the above problems, the present invention has been completed through intensive research. The present invention is an aqueous multicolor coating composition. It is characterized in that a combination of scale-like gel colored particles and colored or colored spherical fine particles is used as the colored aggregate. By using the above specific combination as the colored aggregate, a clear and easily visible variegated and smooth coating is formed.

The present invention provides an aqueous multicolor coating composition characterized in that a plurality of scaly gel colored particles having different color tones dispersed in an aqueous medium are the main compositions of the multicolor composition in the medium. Further, the present invention is characterized in that the scaly gel colored particles dispersed in an aqueous medium, and spherical fine particles or balun having a color tone different from that of the scaly gel colored particles are the main composition of the multicolored constitution in the medium. An aqueous multicolor coating composition is provided. By arbitrarily selecting the color of the colored aggregate, it is possible to obtain an endless combination of colorful patterns.

When the aqueous multicolor coating composition of the present invention is applied to the surface of an object as a single coating composition, it conceals a transparent base or a colored base, and even when it is repeatedly coated, the same multicolored pattern can be obtained. The coating is reproduced. As the composition, fine colored spherical particles or baluns dispersed in an aqueous medium are entirely coated, and 1 to 4 mm scale-like gel particles colored in a color tone different from the color tone of these fine particles. It is an aqueous coating composition in which evenly scattered multicolored patterns are easily visible.

The present invention provides a water-based multicolor coating composition comprising a water-based paint and colored aggregates having different colors which are incompatible with the aqueous coating composition. The colored aggregates include scaly gel colored particles and colored or colored spherical fine particles. It relates to a waterborne multicolor coating composition which is characterized by the use of a combination and which allows a clear and easily visible multicolored and smooth coating.

The aqueous multicolor coating composition of the present invention which uses a combination of scale-like gel colored particles and colored or colored spherical fine particles as a colored aggregate has an overlap at the time of spraying as compared with the case of general coating. There are few irregularities for the size of the aggregate, which hides the badness of the base material or the material and finishes into a smooth film.

The aqueous multicolor coating composition of the present invention is a spray coating composition. As a coating means, spray coating is generally used because of its beautiful multicolored pattern, economical efficiency, workability, and uniform finish. Spray coating is a method of spraying a paint by using a spray gun to atomize the paint. It spread quickly with the advent of lacquer that cannot be coated by conventional brush coating. As a paint supply system, the gravity system and the lower cup system are widely used due to their ease of use, and the pressure delivery system is industrially used.

The diameter of the gun depends on the type of paint used,
Generally, it is properly used within a range of 1.0 to 2.0 mm.
In a water-based multicolor coating composition using a conventional colored aggregate, each colored fine particle of 2 to 3 mm or less cannot be expected to be deformed at the time of nozzle injection, and has a particle diameter of about 1/3 or less of the nozzle diameter. it can not be used, whereas colored natural stone particle diameter 2 mm, if an attempt coating spraying the composition of artificially colored particles, it is necessary to coat using spray gun caliber 5 to 6 mm, 1 m ² amount of coating material Can reach 2-3 kg.

Even when spherical particles are used, they do not deform when ejected from the nozzle, like the fine colored particles such as natural stones, so if one expects an easy and stable spraying operation, they will be 1/2 of the nozzle diameter. There is a limitation in that a moderate particle size must be used. For example, assuming that the nozzle diameter is fixed at 1.5 mm, the particle size of each colored fine particle such as the natural stone is 0.5, and the particle size of the colored spherical particle is about 0.7 mm. .

As a result, even if multiple colors are combined or a multicolor coating composition is formed, each color cannot be visually recognized after coating, and the original meaning of the multicolor coating is lost, and an iridescent sensation is exhibited. It becomes a color. Therefore, if a particle size (1 to 3 mm) that is easy to visually recognize is adopted, irregularities associated with a large particle size are generated in the formed film, which is not aesthetically appropriate. Also, the amount of the coating agent used is several times or ten times, which is extremely economically inappropriate.

Therefore, the present invention provides an original multi-color coating capable of giving a coating in which a number of colors are interspersed in spots or mottled patterns with a single application using a spray gun having an ordinary nozzle diameter. Composition paints. By combining the color tone and gloss of the colored aggregate, it is possible to easily obtain coating films having various design characteristics.

The scaly gel colored particles which are an essential component of the composition of the present invention are manufactured by the method described below.

A pigment which does not affect gelation in the production process of an aqueous solution of a water-soluble polymer compound such as sodium alginate, arbumen, casein and polyvinyl alcohol,
Color with a lake, dye or the like or an aqueous dispersion thereof. A synthetic resin emulsion suitable for the intended use is selected and added and stirred to form a viscous colloidal liquid. Since the synthetic resin emulsion is greatly involved in the adhesion of gel particles, it is necessary to select the synthetic resin emulsion according to the application and required physical properties.

The viscous colloidal solution is sprayed on a smooth surface into particles by using a particle gun, and the colloidal solution is gelated before it is dried. Dip in a suitable gelling solution to form scaly gel particles. Specifically, for example, after defoaming, it is sprayed on a smooth surface using a particulate spray gun, and immediately immersed in an aqueous solution of formic acid or hydrochloric acid for gelation.

The gelled scale-like colored gel particles can be adjusted in gel strength by increasing / decreasing the amount of sodium alginate added or partially using carrageenan together. The thickness of the scale-like colored gel particles is usually 0.1 to 0.2 m.
Although it is about m, by increasing the viscosity of the above composition,
It is possible to increase the thickness of the scale-like colored gel particles,
It is possible to produce thin scaly gel particles by allowing a short period of time between spraying with a particle gun and immersion in the gelling solution.

The scale-like gel particles produced in this manner are separated by a metal mesh, and calcium chloride, aluminum sulfate, zinc sulfate, barium chloride, for the purpose of stabilizing the scale-like gel particles for a long period of time. Immerse in an aqueous solution such as glyoxal, leave it to stand and wash with water. The scale-like colored gel particles after washing with water are separated and dehydrated by a metal mesh until the scale-like colored gel particles leave a stable amount of water. After washing with water, filtration and dehydration, scale-like colored gel particles of alginic acid are obtained.

[0025]

The present invention will be described in detail with reference to Examples. The present invention is not limited to these examples.

Example 1 (1) First, scaly gel gray particles are produced using the following components and proportions. This is a scale-like gel gray particle with sodium alginate suitable for general use.

Sodium alginate 2 parts Water 80 parts Titanium oxide 70% water dispersion 2 parts Carbon black 20% dispersion 0.1 part Synthetic resin acrylic emulsion 16 parts

1 part of sodium alginate was dissolved in 47 parts of water with stirring at room temperature, and then titanium oxide was gradually added to obtain a uniform and viscous solution. Instead of titanium oxide, color pigments,
Lakes and / or dyes can be added as appropriate. Then, the synthetic resin emulsion is added. The synthetic resin emulsion has a great influence on the adhesion of the gel particles, and can be selected according to the intended use and the required physical properties. After defoaming, it is sprayed on a smooth surface using a particulate spray gun and immediately immersed in a 5-10% aqueous solution of formic acid or hydrochloric acid to cause gelation.

The gelled scale-like colored gel particles can be adjusted in gel strength by increasing / decreasing the amount of sodium alginate added or partially using carrageenan together. The thickness of the scale-like colored gel particles is usually 0.1 to 0.2 m.
Although it is about m, by increasing the viscosity of the above composition,
It is possible to increase the thickness of the scale-like colored gel particles,
It is also possible to produce thin scale-like gel particles by allowing a short period of time between spraying with a particle gun and immersion in the gelling solution.

The scale-like gel particles produced in this manner are separated by a 40-mesh metal net and calcium chloride, aluminum sulfate, zinc sulfate, for the purpose of stabilizing the scale-like gel particles for a long period of time. It is immersed in a 1 to 2% aqueous solution of barium chloride, glyoxal, etc., and left standing for 4 to 5 hours to wash with water. The scale-like colored gel particles after washing with water are separated and dehydrated by a metal mesh until the scale-like colored gel particles leave a stable amount of water. After washing with water, filtration and dehydration, scale-like colored gel particles of alginic acid are obtained.

(2) Using 30 parts of the obtained alginic acid scale-like colored gel particles, an aqueous multicolor coating composition having the following composition was prepared.

Synthetic resin Acrylic emulsion 48 parts Benzyl alcohol 3.5 parts Texanol 2.0 parts Vinylidene chloride-acrylonitrile copolymer Barun 40-100 microns 10 parts The above alginic acid scale-like colored gel particles 30 parts Thickener, antifoaming agent , Preservative, etc. 6.5 parts

As the synthetic resin acrylic emulsion, an emulsion that is acid resistant or stable to the metal salt used for gelation is selected. First, 48 parts of a synthetic resin acrylic emulsion is weighed into a tank, and a mixture of predetermined amounts of benzyl alcohol and texanol prior to addition is gradually added with stirring. Then, vinylidene chloride-acrylonitrile copolymer balun is added and uniformly dispersed. Next, the above-prepared alginic acid scale-like colored gel particles prepared in advance are added at a stirring speed that does not destroy them, and the remaining thickener, defoaming agent and preservative are added to give a uniform and uniform state. Stirring is continued until it becomes an aqueous multicolor coating composition.

(3) The obtained water-based multicolor coating composition was treated with an internal pressure gun of a nozzle having a diameter of 1.5 mm to obtain an internal pressure of 0.5 kg.
By coating with a coating pressure of 3 kg, a beautiful multicolored pattern in which particles of gray-colored particles having a diameter of about 2 mm were scattered could be produced.

Example 2 (1) First, scaly brown gel particles are produced using the following components and proportions.

Sodium alginate 2 parts Water 80 parts Brown 25% dispersion 2 parts Synthetic resin acrylonitrile emulsion polymerization emulsion 16 parts

Separately, the following components and proportions are used to produce sodium alginate scaly ocher gel particles.

Sodium alginate 2 parts Water 80 parts Iron oxide yellow ocher 40% dispersion 2 parts Synthetic resin acrylonitrile emulsion polymerization emulsion 16 parts

It is produced in the same manner as in the method for producing the scaly gel particles of Example 1.

(2) An aqueous multicolor coating composition for coating vinyl chloride such as wallpaper was prepared using the obtained flaky brown gel particles and flaky ocher gel particles.

Synthetic resin Acrylonitrile emulsion polymerization emulsion 45 parts Texanol 4 parts Aluminasilicate Barun 5 to 150 microns 35 parts Alginic acid scale-like brown gel particles 5 parts Alginic acid scale-like ocher color gel particles 5 parts Thickener, antifoaming agent , Preservative, etc. 6 parts

Synthetic Resin Acrylonitrile emulsion polymerized emulsion is gradually added with stirring texanol.
Next, when alumina silicate balun (light brown) is added to a uniform state, the stirring speed is reduced as much as possible in order to prevent the scale-like gel particles to be added next from being destroyed by stirring and shearing. Add colored gel particles. In the homogenized state, add a thickener and the like and continue stirring until the state becomes uniform.

(3) The obtained water-based colorful coating composition for vinyl chloride such as wallpaper was coated with an internal pressure coating gun having a nozzle diameter of 1.5 mm and dried. The coated surface thus obtained has a beautiful surface condition as if it was ground by spraying 2-3 mm of natural brown sand. 2 to 3 mm compared to the case of general painting
When the aggregate is sprayed, there are overlaps at the time of spraying, and irregularities larger than the size of the aggregate can be formed to conceal the badness of the base material or the raw material, but it is in a rough finished state not comparable to the product of the present invention.

Example 3 (1) Method for producing scale-like colored gel particles using polyvinyl alcohol Polyvinyl alcohol 4 parts Water 84.0 parts Titanium oxide 70% water dispersion 1 part Sinin Blue 15% water dispersion 0. 5 parts Synthetic resin acrylic emulsion 10 parts Defoamer, other 0.5 parts

84 parts of water is heated to a temperature of 80 to 90 ° C.,
Polyvinyl alcohol (degree of polymerization 1700-250
0, saponification degree 90-99%) is added with stirring, and stirring is continued until a transparent and homogeneous aqueous solution is formed. Then titanium oxide 70% water dispersion, Shinin blue 15%
Add water dispersion, synthetic resin acrylic emulsion, defoaming agent, etc. and stir and mix until uniform. After cooling, Example 1
Similarly, a particle-like spraying gun is used to spray particles onto a smooth surface, and the particles are immersed in a mixed aqueous solution of borax 5% and sodium carbonate 5% to produce scaly colored gel particles. The above borax 5
%, Changing to a gelling agent of a mixed aqueous solution of sodium carbonate 5%,
It is also possible to use sodium sulfate or barium sulfate. By using a colorant of each color in place of the titanium oxide aqueous dispersion and the Thinning Blue aqueous dispersion, scale-like colored gel particles having various tones can be produced.

(2) Water-soluble multicolored coating composition of scale-like colored gel particles with polyvinyl alcohol Synthetic resin acrylic emulsion 48 parts Butyl glycol acetate 5 parts Texanol 2 parts Vinylidene chloride acrylonitrile co-polymer barun 10 parts Polyvinyl alcohol scale-like Colored gel particles 30 parts Thickener, antifoaming agent 5 parts

The aqueous multicolor coating is prepared in the same manner as in Example 1 (2).

The resulting aqueous multicolor coating composition was subjected to an internal pressure of 0.5.
When applied at a coating pressure of 3 kg and a coating pressure of 3 kg, the color tone around the scaly colored gel particles is not clearly distinguished from the former, unlike in Examples 1 and 2, and a beautiful multi-color coating can be formed.

Example 4 (1) Method for producing scaly colored gel particles with casein Casein 4 parts Water 80 parts Casein dissolving agent Appropriate amount Synthetic resin EVA emulsion 10 parts Water dispersion of colorant 1-2 parts Defoamer , Preservative 2 parts

Add 40 parts of casein to 85 parts of water to 40-60
Sufficiently swell casein at ° C, and add and dissolve an appropriate amount of sodium fluoride, sodium phosphate, calcium hydroxide, aqueous ammonia, etc. as a casein dissolving agent. Then synthetic resin EV
A emulsion, an aqueous dispersion of a colorant, an antifoaming agent, and a preservative are added to obtain a uniform and uniform state. After cooling by standing, a particle gun was used to apply particles in the form of particles onto a smooth surface as in Example 1, and the scale-like colored gel particles were prepared by immersing in a 0.5-2% aqueous solution of lead acetate and copper sulfate. A multicolor coating composition can be obtained by washing with water, filtering, and dehydration, and then adding the alginic acid scale-like colored gel particles of Example 2 instead.

[0051]

EFFECTS OF THE INVENTION It is possible to provide a water-based multicolor coating composition which can be visibly and easily visually recognized to form a multicolored and smooth coating. Compared with the case of general coating, there is less overlap at the time of spraying, there is less unevenness in the size of the aggregate, and a water-based multicolor coating composition that conceals the badness of the base material or material and finishes into a smooth film is provided. be able to.

Claims (5)

[Claims] 1. An aqueous multicolor coating composition comprising a combination of scaly gel colored particles and colored or colored spherical fine particles as a colored aggregate dispersed in an aqueous medium in the aqueous multicolor coating composition. object. 2. The aqueous multicolor coating composition according to claim 1, wherein a plurality of scaly gel colored particles having different color tones are used as the scaly gel colored particles. 3. The aqueous multicolor coating composition according to claim 1, wherein spherical fine particles having a color tone different from that of the scaly gel colored particles are used as the colored or colored spherical fine particles. 4. As the scale-like gel colored particles, particles obtained by gelling a viscous colloidal liquid consisting of an aqueous solution of a colored water-soluble polymer compound and a synthetic resin emulsion into particles are used. The aqueous multicolor coating composition according to claim 3. 5. The aqueous multicolor coating composition according to claim 1, claim 2, claim 3 or claim 4, wherein organic or inorganic balun is used as the spherical fine particles.