JPH11130995A - Water paint composition, water paint composition for inorganic decorative sheet coating film formed of water paint composition and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a coating film having remarkable film hardness and excellent resistance to scratch. SOLUTION: A water paint composition and a water paint composition for an inorganic decorative sheet are obtained by adding flyash to a water paint comprising a basic resin and water. A coating film is formed of this composition. The inorganic decorative sheet is coated with this coating film. Manufacture of the film-coated inorganic decorative sheet comprises coating the above- mentioned water paint on sealer-precoated surface of the inorganic decorative sheet and hardening thereof. The water paint composition is coated preferably by any one of spray coating, roll coating, flow coating and brush coating.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

FIELD OF THE INVENTION The present invention relates to an aqueous coating composition, an aqueous coating composition for an inorganic decorative board, and a coating composition formed from these coating compositions, which can provide a coating film having a high coating film hardness and excellent abrasion prevention ability. The present invention relates to a coated film, an inorganic decorative plate covered with the coated film, and a method for producing the same.

[0002]

BACKGROUND OF THE INVENTION Heretofore, decorative boards of various materials such as nonflammable inorganic decorative boards have been used as exterior materials of buildings, for example.

[0003] On the surface of the inorganic decorative plate, paints of various colors are usually applied in order to enhance the appearance of the building and to increase the strength of the inorganic decorative plate. As a coating material used in such applications, the hardness of a coating film formed by applying and curing the coating material is high, and the coating film has an excellent ability to prevent abrasion. It is desirable that the coating film of the decorative board is not easily scratched and has excellent ease of handling during construction. Also, painted outside the building,
It is desirable that the coating film does not easily suffer from abrasion even when subjected to rain and wind mixed with sand, and that the coating film does not easily crack when exposed to a cold or warm environment.

[0004] Such paints include solvent-based paints,
Various types of paints such as water-based and mixed-based paints can be mentioned,
Water-based paints are preferred in that they do not relatively pollute the surrounding environment due to the fact that the organic solvent content is zero or low even when they are carried out on site and there is no risk of fire and that they are excellent in safety to the human body.

In such a water-based paint (water-based paint), in order to improve the ability of the resulting coating film to prevent abrasion, for example, it is conceivable to increase (increase) the hardness of the coating film. In order to obtain such a higher hardness coating film, an aqueous polymer containing, as a resin component, an emulsion polymer obtained by copolymerizing a plurality of monomers mainly composed of MMA (methyl methacrylate) at the time of preparing various aqueous coating materials. It is conceivable to use a paint or, for example, use an aqueous paint containing, as a resin, a styrene-modified emulsion polymer obtained by adding styrene based on vinyl acetate and an acrylic monomer and copolymerizing them. Can be

However, when such an aqueous paint is used as it is, not only does the film forming temperature (drying and curing temperature) rise, but also the resulting coating film becomes brittle and the coating film tends to crack. There is a point.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to solve the problems associated with the prior art described above, and to provide a water-based coating composition having a high coating strength and capable of obtaining a coating having an effect of preventing scratches. It is an object of the present invention to provide an aqueous coating composition for an object, particularly an inorganic decorative board.

Another object of the present invention is to provide a coating film formed from the coating composition, an inorganic decorative plate coated with the coating film, and a method for producing the same.

[0009]

SUMMARY OF THE INVENTION The aqueous coating composition of the present invention and the aqueous coating composition for an inorganic decorative board (both are collectively referred to simply as "aqueous coating composition") are each composed of a base resin and water. It is characterized in that fly ash is contained in the water-based paint.

In the present invention, it is preferable that the above-mentioned aqueous coating composition is applied to the surface of the inorganic decorative board coated with the sealer and cured to produce an inorganic decorative board with a coating film. In this case, the aqueous coating composition is sprayed,
It is preferable to apply by any one of a roll coater method, a flow coater method, and a brush coating method.

The coating film according to the present invention is formed from the above coating composition. The decorative plate with a coating film according to the present invention is formed by coating an object to be coated (substrate), in particular, the surface of an inorganic substrate with a coating film composed of the above-mentioned coating composition.

As described above, the water-based coating composition according to the present invention contains fly ash, and is formed by applying and curing the water-based coating composition on the surface of various molded articles (eg, inorganic decorative boards). The film has high hardness, hardly causes cracks, and is excellent in abrasion prevention ability.For example, when transporting the decorative board with the coated film, it is difficult for the coated film surface of the decorative plate to be easily scratched even during construction, It is easy to handle when installing decorative panels.

[0013]

DETAILED DESCRIPTION OF THE INVENTION Hereinafter, the water-based coating composition and the water-based coating composition for an inorganic decorative board according to the present invention will be described in detail. Hereinafter, the two are collectively referred to simply as "water-based paint composition".
Also say.

[Water-based paint composition ] [ 0014] The water- based paint composition and the water-based paint composition for an inorganic decorative board (water-based paint composition) according to the present invention each include an aqueous paint comprising a base resin and water, and fly ash. Is contained.

In such an aqueous coating composition, the base resin is emulsified in water (medium) (particle diameter of the base resin: Example 0.1).
(About 1 to several μm) or colloidal dispersion (base resin particle diameter: eg 0.01 to 0.1 μm), or may be dispersed in water (base resin particle diameter:
(Eg, less than 0.01 μm), or may be a composite type thereof, and the dispersion state of the resin and the properties (eg, slurry) of the composition are not particularly limited.

<Base Resin> As the base resin used in the water-based coating composition according to the present invention, an aqueous resin generally used for aqueous (water-based or water-soluble) coating can be used. Specifically, for example, aqueous polyester resin, aqueous vinyl acetate resin, aqueous acrylic resin, aqueous acrylic-styrene copolymer resin, aqueous chlorinated polyolefin, aqueous ethylene-vinyl acetate copolymer resin, aqueous vinyl acetate-acryl copolymer Resin, aqueous ethylene-vinyl chloride copolymer resin, aqueous vinyl acetate-vinyl versatate (Veova) copolymer resin, aqueous styrene-butadiene copolymer resin, aqueous alkyd resin, aqueous melamine resin, aqueous urea resin, aqueous phenol resin, Aqueous epoxy resin, aqueous polybutadiene, aqueous urethane resin, aqueous fluorine resin, aqueous acrylic silicone Aqueous resin fat and the like. These aqueous resins may be used alone or in combination of two or more.

In the present invention, among these aqueous resins, an aqueous acrylic resin, an aqueous vinyl acetate resin, an aqueous urethane resin, an aqueous acrylic silicone resin, an aqueous fluororesin, and an aqueous chlorinated polyolefin are preferable. The molecular weight of such an aqueous resin differs depending on the type of resin, the type of paint (water-based method), and the like, and is not determined unconditionally.

It is desirable that such a base resin is contained in the aqueous coating composition of the present invention in a total amount of usually 5 to 30% by weight, preferably 10 to 25% by weight.

<Water> Water has a function as a dispersion medium or a solvent for the resin, and its content in the aqueous coating composition of the present invention varies depending on the method of making the resin aqueous, and is not particularly limited. However, for the aqueous solution type, usually 10 to 10
70% by weight, usually 5 to 1 for dispersion type
In the case of an emulsion type, it is usually contained in an amount of usually less than 5% by weight.

<Fly ash> Fly ash (fl
y ash) is fine ash particles in the flue gas. As the fly ash, for example, particulate ash collected by a dust collector of a pulverized coal combustion boiler is used and usually has a nearly spherical shape. It has a shape. In the present invention, among such fly ash, usually, its particle size (average particle size)
Is 100 μm or less, preferably 35 μm or less. Fly ash having such an average particle size can be prepared by filtering and classifying the particulate ash collected by the above method.

Also, such fly ash is 10
A mesh passing through a sieve of 0 mesh is 60% or more, preferably 10% or more.
It is desirable that the amount of the 0 mesh passed through a sieve is 90% or more.

When fly ash having such a particle size is used, coating workability is excellent, and clogging of a coating machine nozzle used at the time of coating hardly occurs. Usually, an emulsion-based aqueous coating composition is obtained. The appearance of the coating film obtained by applying and curing the aqueous coating composition is excellent in smoothness.

The fly ash is usually used in the aqueous coating composition of the present invention in an amount of 1 to 100 parts by weight, preferably 6 to 100 parts by weight, based on 100 parts by weight of the resin solids in the aqueous coating composition.
It is desirable that it is contained in an amount of 0 to 90 parts by weight from the viewpoint that good scratch resistance and good adhesion of aggregate can be obtained. If the content of the fly ash in the aqueous coating composition of the present invention is less than 1 part by weight (based on 100 parts by weight of resin solids), scratch resistance tends to be poor, and 100 parts by weight (solids content of resin) (For 100 parts by weight)
If the ratio exceeds the range, the adhesion of the aggregate tends to be poor. Also,
This fly ash is usually 5 to 30% by weight, preferably 10 to 20% by weight in 100% by weight of the aqueous coating composition.
Is preferably contained in an amount of

[ Production of aqueous coating composition ] Such an aqueous coating composition can be produced by appropriately utilizing a conventionally known method. For example, the above-mentioned base resin and fly ash are described below. Such as coloring pigment, extender pigment,
Thickeners, dispersants, defoamers, film-forming aids, preservatives, etc. are added at a predetermined ratio all at once or in any order, stirred and mixed, and the resulting mixture (a) is dispersed in a dispersion medium. Alternatively, it may be dispersed or dissolved in water as a solvent. Note that an organic solvent may be used in combination with the water.

[Other Ingredients] The aqueous paint composition according to the present invention contains a color pigment, an extender, a thickener, a dispersant, a defoaming agent, a film-forming aid, etc. which are blended in a general water-based paint. Agent,
Preservatives, antisettling agents, matting agents and the like may be included.

Examples of the coloring pigment include a conventionally known inorganic pigment,
Various organic pigments can be used, and examples of the inorganic coloring pigments include, for example, carbon black, titanium dioxide, iron oxide, iron hydroxide, red iron oxide, chromium oxide, graphite, ultramarine, various alloys, white carbon, Alumina, fused alumina, zinc oxide, magnetic iron oxide, boron nitride, silicon carbide, clays and the like can be mentioned. Examples of the organic color pigment include an insoluble azo pigment, a soluble azo pigment, a condensed polycyclic pigment, a quinacridone pigment, an isoindolinone pigment, cyanine blue, and cyanine green. Note that various colorants such as dyes may be included.

Examples of the extender (extender) include alumina white, aluminum hydroxide, kaolin, clay, white carbon, talc, calcium carbonate, magnesium carbonate, barium carbonate, barium sulfate, bentonite and the like.

As the thickener (thickener), for example,
Examples include methylcellulose, carboxymethylcellulose, hydroxyethylcellulose, polyvinyl alcohol, sodium alginate, organic acid salts of aluminum, organic bentonite, and silica gel.

The dispersant (surfactant) often also has a role of a pigment settling inhibitor, a color separation inhibitor, a leveling agent, and the like.
Examples include naphthalenesulfonic acid formalin condensate, polycarboxylic acid type polymer activator, sodium alkylbenzenesulfonic acid, lauryl alcohol soda salt, and polyoxy (allyl) ether.

Examples of the antifoaming agent include silicone, vinyl polymer, higher alcohol, tributyl phosphate, pine oil, surfactant and the like. Examples of preservatives include, for example, benzimidazole fungicides [eg:
TBZ {2- (4-thiazolyl-benzimidazole)}], organic compounds such as copper and zinc (eg, naphthenate, phenyl oleate), salicylanilide, pentachlorophenol and the like.

These optional components may be used alone or in combination of two or more, if necessary. When the aqueous coating composition as described above is applied once to a plurality of times on the surface of various molded articles (objects to be coated) such as an inorganic decorative board and a calcium silicate cement board, the hardness of the coating film is high, and An inorganic decorative plate with a coating film having excellent prevention ability can be obtained.
That is, a coating film obtained by applying and curing such an aqueous coating composition according to the present invention on the surface of various molded articles has a high hardness and an excellent ability to prevent scratches. In addition, even if sand is mixed in place of the fly ash, the sand easily falls off the coating film, and the scratch resistance is poor. Even if plastic particles are used in place of the fly ash, the ability to prevent abrasion is low, and nail marks (scratches and nail marks such as nails and nails) are easily formed on the coating film surface.

The aqueous coating composition according to the present invention may be applied directly to the surface of an object to be coated such as an inorganic decorative plate [eg: calcium silicate plate (calical plate), slate plate]. It may be applied to the surface of an inorganic decorative board or the like on which a base material (primer coating) such as a primer or a sealer has been applied in advance. Alternatively, the surface of the substrate to which the coating with the aqueous coating composition of the present invention has already been performed or the coating with the aqueous coating composition of the present invention has been performed may be overcoated with the aqueous coating composition of the present invention for repair. .

The use of the inorganic decorative board is as follows.
For example, there is a building exterior material, and as the building exterior material, a long object (trunk) having an irregular cross-sectional shape which is brought into contact with an outer wall panel, a butt portion between the first floor and the second floor of the building outer wall.
Besides, blindfold, gout and the like.

As described above, in order to apply the aqueous coating composition according to the present invention to the surface of an object such as an inorganic decorative board, a conventionally known method can be appropriately used. , Airless spray), a roll coater, a flow coater, a brush coating, a dip coating and the like. In the case of airless spray coating, the diameter of the fly ash is preferably 15 μm or less because the diameter of the discharge tip of the coating machine used is small.

The amount of the water-based paint composition (paint) to be applied depends on the type of the object to be coated, the type and combination of the undercoat paint applied before the application of the water-based paint composition of the present invention, and the like. For example, the water-based coating composition applied to the surface of the inorganic decorative board is, for example, in an amount of 100 to 500 g / m ² and has a thickness of 50 to 500 μm,
About 30 times 300 m
/ Approximately.

As the drying method, a method such as hot-air drying, IR drying, or natural drying at room temperature can be employed depending on the type of the aqueous resin in the aqueous coating composition to be used and the film-forming temperature (drying / curing temperature).

Examples of undercoat paints such as primers and sealers include vinyl acetate emulsions, acrylic emulsions, and cement / emulsion paints. For inorganic decorative boards, they can cover the brittleness of inorganic base materials. From the viewpoint of excellent impregnation into an inorganic base material and excellent peeling resistance with a coating film composed of the aqueous coating composition of the present invention formed on the surface of the undercoat coating film, the undercoat paint is preferably A specially modified acrylic emulsion paint having good alkali resistance is used.

[0038]

The aqueous coating composition according to the present invention contains fly ash, and a coating film obtained by applying and curing the aqueous coating composition on the surface of various molded articles (eg, inorganic decorative boards). Has a high hardness, is less likely to crack, and has an excellent ability to prevent abrasion.For example, when transporting the decorative board with the coating, at the time of construction, etc., the coating of the decorative board is less likely to be scratched, and It is easy to handle.

[0039]

EXAMPLES Hereinafter, the present invention will be described more specifically with reference to Examples, but the present invention is not limited to such Examples.

[0040]

Example 1 Each component used in the following Examples and Comparative Examples was
As follows. "Zeon 103EPF": white powder of acrylic resin (blend resin for plastisol), average particle size about 70μ
m, manufactured by Shin Daiichi PVC Co., Ltd.

"Acrytone Floor Kc-1": Silica sand powder 15% (particle size measurement impossible), No. 8 silica sand 85% (particle size 0.
01 mm or less), manufactured by Mitsubishi Rayon Co., Ltd. “Fly ash”: average particle size 30 μm, 100 mesh under (100 mesh passing 90% or more),
Gray powder containing silica (50%) and alumina (28%), manufactured by Kansai Electric Power Co., Inc.

"Hivisol L clear": acrylic emulsion paint, resin solid content (non-volatile content) 35% by weight,
Made by China Paint Co., Ltd. "Emacol Black CN": coloring agent, manufactured by Sanyo Dyeing Co., Ltd.

Test methods in the following Examples and Comparative Examples are as follows.

<Coating conditions> Coating machine: air spray (high-viscosity gun) Preheat (plate surface temperature): 40 to 50 ° C. Viscosity (Iwata cup / second): 20 to 30 seconds Coating amount (g / scale ² ): 10 g / scale ² drying: 80 ° C. × 15 minutes

<Evaluation of Appearance> The scratch resistance (pencil hardness) was determined as follows:
Two types of polydecorated plywood (the plywood surface is coated with a synthetic resin) and an extruded member were evaluated as the objects to be evaluated.

[Evaluation Criteria for Scratch Resistance (Pencil Hardness)] 4 (）) ··· The surface will not be scratched unless rubbed with a pencil hardness of 2H or more. 3 (○-△) ··· Scratching the surface when rubbing with pencil hardness H.

2 (△) ··· The surface is scratched when rubbed with pencil hardness HB to F. 1 (x): The surface is scratched even when rubbed with pencil hardness B or less.

[0048]

Example 1 Under the above conditions, a base coating material “HIBISOL L CLEAR” (acrylic emulsion, resin solid content 35% by weight,
60 parts by weight of China Paint Co., Ltd., 12.5 parts by weight of colorant "Emacol Black CN" (manufactured by Sanyo Pigment Co., Ltd.), 12.5 parts by weight of water for viscosity adjustment, and aggregate "Fly Ash" (Average particle size 30 μm, 100 mesh under,
An aqueous coating composition comprising 15 parts by weight (a total of 100 parts by weight of all components) manufactured by Kansai Electric Power Co., Inc. was applied, and the appearance was evaluated.

Regarding the abrasion resistance, regardless of whether the surface was coated with a decorative plywood or an extruded member, the surface was not abraded unless rubbed with a pencil hardness of 2H or more. Table 1 also shows the coating composition and the evaluation results.

[0050]

Comparative Examples 1 to 3 The abrasion resistance was evaluated in the same manner as in Example 1 except that the composition of the paint was changed as shown in Table 1.

Table 1 shows the results.

[0052]

[Table 1]

Claims (6)

[Claims] 1. An aqueous coating composition comprising fly ash in an aqueous coating comprising a base resin and water. 2. An aqueous paint composition for an inorganic decorative board, wherein fly ash is contained in an aqueous paint comprising a base resin and water. 3. A coating film formed from the aqueous coating composition according to claim 1. 4. An inorganic decorative plate coated with the coating film according to claim 3. 5. A method for producing an inorganic decorative board with a coating film, comprising applying the aqueous coating composition according to claim 1 to the surface of the inorganic decorative board to which a sealer has been applied, and curing the coating. 6. The coating film according to claim 5, wherein said aqueous coating composition is applied by any one of a spray method, a roll coater method, a flow coater method, and a brush coating method. For producing an inorganic decorative plate with a coating.