JP2022019635A - Coating method of dwelling-house base concrete outer surface - Google Patents

Abstract

To provide a coating method for enhancing a protection function to a dwelling-house base concrete outer surface, and suitable for imparting external appearance having a high-class feeling.SOLUTION: A coating method of a dwelling-house base concrete outer surface includes: a process (1) for coating the outer surface of dwelling-house concrete with an undercoat paint (I) containing an inorganic pigment (A1) and an aqueous resin (B1), and forming an undercoat film by drying the paint; and a process (2) for applying a topcoat paint (II) containing color paint particles (A2) which are obtained by granulating a color paint and an aqueous resin (B2) on the undercoat film which is obtained in the process (1), and forming a topcoat film having a dot pattern by drying the paint. A quantity of the inorganic pigment (A1) contained in the undercoat paint (I) is equal to or larger than 100 mass parts with respect to a resin non-volatile amount 100 mass parts of the aqueous resin (B1), and an elongation rate of a film which is formed of the undercoat paint (I) at a temperature of 23°C is equal to or higher than 100%.SELECTED DRAWING: None

Description

The present invention relates to a method for painting an outer surface of a housing foundation concrete.

The foundation of a house is the foundation for supporting the house and is usually made of reinforced concrete. Since such a housing foundation, that is, the housing foundation concrete, is located near the ground, it is constantly exposed to the humidity generated by rainwater and moisture from the ground surface, and is the harshest of the members that make up a house. It is placed in a nice atmosphere. In addition, if the concrete cracks due to deterioration over time, water will infiltrate into the foundation and rust will occur on the reinforcing bars, or the concrete will be neutralized. Under such circumstances, in recent years, paint has been applied to the housing foundation concrete for the purpose of suppressing the deterioration of the housing foundation concrete over time.

As a method for coating a housing foundation concrete, for example, Patent Document 1 discloses a finishing method in which a polymer cement-based base adjustment coating material is applied to the surface of the housing foundation concrete and then a finishing coating film having water vapor permeability is laminated. According to this finishing method, it is possible to give a protective coating film with less swelling, peeling, etc. to the concrete surface of the foundation of a house, but iron coating is applied to thickly apply the polymer cement-based foundation conditioner that is the foundation. There is a problem in terms of painting workability.

Further, in Patent Document 2, a siloxane-modified resin emulsion in which an acrylic resin derived from a (meth) acrylic acid alkyl ester and a silicone resin derived from a cyclic siloxane compound are mixed in the particles is used as a binder on the concrete surface of the housing foundation. A coating method for coating a water-based topcoat material containing an ester is disclosed. According to the coating method described in Patent Document 2, the concrete surface of the foundation of a house can be protected for a long period of time, but there is a problem that cracks occur when the amount of the water-based topcoat material applied is small.

By the way, in recent years, with the diversification of user's tastes, houses are required to have an original appearance. For this reason, there is a need for painting specifications that give a unique appearance to the outer surface of the foundation of a house.

As a painting method for imparting design to the inner and outer walls of a building, the applicant has proposed in Patent Documents 3 and 4 a painting method using a multicolored pattern paint containing grains of a plurality of colors as a top coat paint. However, when the coating methods described in Patent Documents 3 and 4 are applied to the concrete surface of the foundation of a house as they are, the graininess of various patterns is reduced, and the coating film is swelled or cracked over time, resulting in a satisfactory appearance. I can't.

JP-A-2002-161625 Japanese Unexamined Patent Publication No. 2008-12454 Japanese Unexamined Patent Publication No. 2008-114112 Japanese Unexamined Patent Publication No. 2008-155119

When painting is applied to the concrete surface of the foundation of a house, the paint film may swell or peel off due to factors such as the rainwater splashing on the ground coming into contact with the paint film or the water sucked up from the ground being released from the surface of the concrete of the house foundation. Defects occur. In addition, since concrete deteriorates over time and cracks occur, cracks may also occur in the coating film provided on the surface of the housing foundation made of concrete.

An object of the present invention is to propose a coating method suitable for enhancing a protective function for the outer surface of concrete of a housing foundation and giving a high-class appearance.

The present inventors have diligently studied a coating composition for coating on the outer surface of a housing foundation concrete. As a result, after applying the undercoat paint in which the blending amount of the inorganic pigment and the elongation rate at break of the coating film are within a specific range, the topcoat paint containing the colored paint particles obtained by granulating the colored paint and the binder resin is applied. Therefore, it was found that there are no defects such as swelling and cracks, and a high-class appearance with moderately scattered spots can be easily obtained.

That is, the present invention
Item 1
In the steps (1) and (1) of applying an undercoat paint (I) containing an inorganic pigment (A1) and a water-based resin (B1) to the outer surface of the housing foundation concrete and drying it to form an undercoat coating film. A topcoat paint (II) containing colored paint particles (A2) and an aqueous resin (B2) formed by granulating the colored paint is coated on the obtained undercoat paint, and dried to form a spotted topcoat. Including the step (2)
The amount of the inorganic pigment (A1) contained in the undercoat paint (I) is 100 parts by mass or more with respect to 100 parts by mass of the resin non-volatile content of the aqueous resin (B1), and the coating film is formed by the undercoat paint (I). The elongation rate of the film at break at 23 ° C. is 100% or more.
How to paint the outer surface of the concrete of the foundation of a house.
Item 2
Item 2. The coating method according to Item 1, wherein the water-based resin (B1) is an acrylic resin and is a resin obtained by an emulsion polymerization method.
Item 3
Item 2. The coating method according to Item 1 or 2, wherein the aqueous resin (B1) contains a carbonyl group.
Item 4
Item 6. The coating method according to any one of Items 1 to 3, wherein the glass transition temperature of the resin of the aqueous resin (B1) is 25 ° C. or lower.
Item 5
Item 6. The coating method according to any one of Items 1 to 4, wherein the undercoat paint (I) is applied using a roller.
Item 6
A water-based liquid composition in which the colored paint particles (A2) contained in the topcoat paint (II) contain a colorant (a2-1), a water-based resin (a2-2), a colored paint containing water, and a water-soluble polysaccharide. Item 6. The coating method according to any one of Items 1 to 5, which is obtained by contacting with an aqueous medium containing a metal compound and stirring the mixture.
Item 7
Item 6. The coating method according to Item 6, wherein the non-volatile acid value of the aqueous resin (a2-2) is 20 mgKOH / g or less.
Item 8
Item 6. The coating method according to any one of Items 1 to 7, wherein the topcoat paint (II) contains a water-based resin (B2) as a binder component, and the water-based resin (B2) contains a carbonyl group.
Item 9
Item 6. The coating method according to any one of Items 1 to 8, wherein the water-based resin (B2) is a core-shell type dispersed particle.
Item 10
Item 6. The coating method according to any one of Items 1 to 9, wherein the topcoat paint (II) has a viscosity of 100 KU or more at 25 ° C.
Item 11
Item 6. The coating method according to any one of Items 1 to 10, wherein the top coat paint (II) is applied using a roller.
Item 12
Item 6. The coating method according to any one of Items 1 to 11, wherein the topcoat paint is further applied on the topcoat coating film formed in the step (2).
Item 13
In the steps (1) and (1) of applying an undercoat paint (I) containing an inorganic pigment (A1) and a water-based resin (B1) to the outer surface of the housing foundation concrete and drying it to form an undercoat coating film. A topcoat paint (II) containing colored paint particles (A2) and an aqueous resin (B2) formed by granulating the colored paint is coated on the obtained undercoat paint, and dried to form a spotted topcoat. Including the step (2)
The amount of the inorganic pigment (A1) contained in the undercoat paint (I) is 100 parts by mass or more with respect to 100 parts by mass of the resin non-volatile content of the aqueous resin (B1), and the coating film is formed by the undercoat paint (I). The elongation rate of the film at break at 23 ° C. is 100% or more.
How to manufacture the outer surface of painted residential foundation concrete.
Regarding.

According to the coating method of the present invention, it is possible to protect the housing foundation concrete for a long period of time and to give a speckled and luxurious appearance to the outer surface of the housing foundation concrete.

<Applied material>
The object to be coated to which the coating method of the present invention is applied is residential foundation concrete. Residential foundation concrete is usually formed by installing a formwork at the place where the house is built, placing reinforcing bars to increase the strength in the formwork, then placing ready-mixed concrete, curing it, and removing the formwork. The surface of the formed housing foundation concrete can be classified into an outer surface and an inner surface, but the application target of the method of the present invention is the outer surface. The outer surface of the housing foundation concrete refers to the surface that can be seen from the outside of the house, and the inner surface of the housing foundation concrete refers to the surface that cannot be seen from the outside of the house, such as the underfloor housing foundation concrete part. The outer surface of the housing foundation concrete may be flat or may have a fine uneven pattern for the purpose of decoration. Further, in order to improve the adhesion of the coating film by the undercoat paint (I) described later, it may be treated in advance with a sealer, a primer or the like.

<Process (1)>
In the coating method of the present invention, as a step (1), an undercoat paint (I) containing an inorganic pigment (A1) and a water-based resin (B1) is applied to the outer surface of the housing foundation concrete and dried to form an undercoat coating film. Let me.

Inorganic pigment (A1):
Examples of the inorganic pigment (A1) include titanium oxide, carbon black, zinc oxide, zinc sulfide, barium sulfate, calcium carbonate, chromium oxide, silica, red iron oxide, mica, talc, gypsum, clay, white carbon, diatomaceous earth, and carbonic acid. Examples thereof include magnesium, alumina white, and gloss white.

In the present invention, the amount of the inorganic pigment (A1) contained in the undercoat paint (I) is 100 parts by mass or more with respect to 100 parts by mass of the resin non-volatile content of the aqueous resin (B1) contained in the undercoat paint (I). Is important, and it is particularly suitable to be in the range of 120 to 500 parts by mass.

In the present specification, the "nonvolatile component" refers to a residue excluding volatile components such as water and an organic solvent, and is a component that forms a coating film. Examples of the drying condition of the sample when measuring the non-volatile content mass include a method of heating 1 gram of the sample in a dryer at 110 ° C. for 1 hour.

Since the amount of the inorganic pigment (A1) contained in the undercoat paint (I) is 100 parts by mass or more with respect to 100 parts by mass of the resin non-volatile content of the aqueous resin (B1), it is provided on the outer surface of the housing foundation concrete according to the present invention. It has the effect of suppressing defects such as swelling and whitening that occur over time in the multi-layer coating film.

Aqueous resin (B1):
As the water-based resin (B1) that is the binder component of the undercoat paint (I), a resin that can be dissolved or dispersed in water is used. The resin type is not particularly limited, and specifically, for example, acrylic resin, polyolefin resin, silicon resin, polyurethane resin, epoxy resin, phenol resin, polyester resin, alkyd resin, polycarbonate resin, etc. Resin and the like can be mentioned. These can be used alone or in combination of two or more, and two or more of these resins may be modified or graft-polymerized. When the aqueous resin (B1) is in the form of dispersed particles, it may be in the form of a single layer or a multilayer such as a core-shell type.

As the water-based resin (B1), an acrylic resin is preferable from the viewpoint of water resistance, crack resistance, weather resistance and the like of the multi-layer coating film provided on the outer surface of the housing foundation concrete. Preferably, 70% by mass or more of the aqueous resin (B1) is an acrylic resin.

Examples of the acrylic resin include resins obtained by copolymerizing a polymerizable unsaturated monomer containing a (meth) acrylate compound as a main component.
Examples of the polymerizable unsaturated monomer include methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, isopropyl (meth) acrylate, n-butyl (meth) acrylate, and isobutyl (meth) acrylate. tert-butyl (meth) acrylate, n-hexyl (meth) acrylate, n-octyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, nonyl (meth) acrylate, tridecyl (meth) acrylate, lauryl (meth) acrylate, Alkyl (meth) acrylates such as stearyl (meth) acrylates and isostearyl acrylates;
Cycloalkyl (meth) acrylates such as cyclohexyl (meth) acrylate, methylcyclohexyl (meth) acrylate, t-butylcyclohexyl (meth) acrylate, cyclododecyl (meth) acrylate;
(Meta) acrylate having an isobornyl group such as isobornyl (meth) acrylate; (meth) acrylate having an adamantyl group such as adamantyl (meth) acrylate; Vinyl aromatic compounds such as styrene, α-methylstyrene and vinyltoluene;
Carboxyl group-containing polymerizable unsaturated monomers such as (meth) acrylic acid, maleic acid, crotonic acid, itaconic acid, β-carboxyethyl acrylate;
Polymerization with an alkoxysilyl group such as vinyltrimethoxysilane, vinyltriethoxysilane, vinyltris (2-methoxyethoxy) silane, γ- (meth) acryloyloxypropyltrimethoxysilane, γ- (meth) acryloyloxypropyltriethoxysilane Sexual unsaturated monomer;
Perfluoroalkyl (meth) acrylates such as perfluorobutylethyl (meth) acrylates and perfluorooctylethyl (meth) acrylates; polymerizable unsaturated monomers having fluorinated alkyl groups such as fluoroolefins;
Monomer having a photopolymerizable functional group such as a maleimide group;
Nitrogen-containing (meth) acrylonitrile, (meth) acrylamide, N, N-dimethylaminoethyl (meth) acrylate, N, N-dimethylaminopropyl (meth) acrylamide, adducts of glycidyl (meth) acrylate and amines, etc. Polymerizable unsaturated monomer;
(Meta) acrylic acids such as 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylicate, 3-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate and 2 to 8 carbon atoms. Monoesteride with dihydric alcohol, ε-caprolactone modified form of monoesteride with (meth) acrylic acid and dihydric alcohol with 2-8 carbon atoms, N-hydroxymethyl (meth) acrylamide, allyl alcohol, A hydroxyl group-containing polymerizable unsaturated monomer such as (meth) acrylate having a polyoxyethylene chain having a hydroxyl group at the molecular end;
Glycidyl (meth) acrylate, β-methylglycidyl (meth) acrylate, 3,4-epoxycyclohexylmethyl (meth) acrylate, 3,4-epoxycyclohexylethyl (meth) acrylate, 3,4-epoxycyclohexylpropyl (meth) acrylate , Epoxy group-containing polymerizable unsaturated monomers such as allylglycidyl ether;
A (meth) acrylate having a polyoxyethylene chain whose molecular end is an alkoxy group;
2-acrylamide-2-methylpropanesulfonic acid, allylsulfonic acid, sodium styrenesulfonic acid, sulfoethylmethacrylate, and sulfonic acid group-containing polymerizable unsaturated monomers such as sodium salts or ammonium salts thereof;
Phosphoric acid group-containing polymerizable unsaturated monomers such as 2-acryloyloxyethyl acid phosphate, 2-methacryloyloxyethyl acid phosphate, 2-acryloyloxypropyl acid phosphate, 2-methacryloyloxypropyl acid phosphate;
A carbonyl group such as acrolein, diacetone acrylamide, diacetone methacrylamide, acetacetoxyethyl methacrylate, formylstyrene, vinyl alkyl ketone having 4 to 7 carbon atoms (eg, vinyl methyl ketone, vinyl ethyl ketone, vinyl butyl ketone). Containing polymerizable unsaturated monomer;
And combinations thereof.

In the present invention, it is preferable that the aqueous resin (B1) contains a carbonyl group. When the water-based resin (B1) contains a carbonyl group, particularly when the water-based resin (B2) contained in the topcoat paint (II) described later contains a carbonyl group, it has excellent water resistance to the outer surface of the housing foundation concrete. It is possible to form a multi-layer coating film.

When a carbonyl group is introduced into the aqueous resin (B1), the amount of the carbonyl group-containing polymerizable unsaturated monomer used is 5 to 35% by mass in the total polymerizable unsaturated monomer used for producing the aqueous resin (B1). In particular, it is preferably in the range of 10 to 30% by mass.

Further, the water-based resin (B1) has a glass transition temperature of 25 ° C. or lower, particularly -30 to 15 from the viewpoint of crack resistance of the multi-layer coating film formed on the outer surface of the housing foundation concrete by the method of the present invention. It is preferably in the range of ° C. In the present invention, the glass transition temperature of the resin is calculated as follows when the resin is an acrylic resin.

1 / Tg (K) = W ₁ / T ₁ + W ₂ / T ₂ + ... W _n / T _n
Tg (° C) = Tg (K) -273
In the formula, W ₁ , W ₂ , ... W _n is the mass fraction of each monomer, and T ₁ , T ₂ ... T _n is the glass transition temperature Tg (K) of the homopolymer of each monomer. ..
The glass transition temperature of the homopolymer of each monomer is a value according to Polymer Hand Book (Second Edition, J. Brandup. E. H. Immunogut) III-139 to 179, and the Tg of the homopolymer is not clear. Is the static glass transition temperature when the homopolymer of the monomer is synthesized so that the weight average molecular weight is about 50,000.
The static glass transition temperature shall be adopted as the glass transition temperature of resins other than the homopolymer or acrylic resin. For the static glass transition temperature, use a differential scanning calorimeter "DSC-220U" (manufactured by Seiko Instruments), take the sample in a measuring cup, vacuum suction to completely remove the solvent, and then 3 ° C / min. It can be obtained by measuring the change in calorific value in the range of −20 ° C. to + 200 ° C. at the temperature rise rate and reading the change point of the first baseline on the low temperature side.

The water-based resin (B1) can be obtained by adopting a usual method, but the emulsion polymerization method is preferable from the viewpoint of water resistance and weather resistance of the multi-layer coating film provided on the outer surface of the housing foundation concrete. For emulsion polymerization, commonly used ionic or nonionic emulsifiers can be used.

Examples of the ionic emulsifier include alkyldiphenyl ether disulfonates such as diammonium dodecyldiphenyl ether disulfonate, sodium dodecyldiphenyl ether disulfonate, calcium dodecyldiphenyl ether disulfonate, sodium alkyldiphenyl ether disulfonate; sodium dodecylbenzene sulfonate, dodecylbenzene sulfonic acid. Alkylbenzene sulfonates such as ammonium; Alkyl sulphate esters such as sodium lauryl sulphate and ammonium lauryl sulphate; aliphatic carboxylates such as sodium fatty acid and potassium oleate; Polyoxyalkylene unit-containing sulphate ester salts (eg, polyoxyethylene alkyl) Polyoxyethylene alkyl ether sulfates such as sodium ether sulfate and ammonium polyoxyethylene alkyl ether sulfate; polyoxyethylene alkylphenyl ether sulfates such as sodium polyoxyethylene alkylphenyl ether sulfate and ammonium polyoxyethylene alkylphenyl ether sulfate; poly Polyoxyethylene polycyclic phenyl ether sulfate ester salts such as sodium oxyethylene polycyclic phenyl ether sulfate and ammonium polyoxyethylene polycyclic phenyl ether sulfate); Naphthalene sulfonate formalin condensate salts such as sodium naphthalene sulfonate formalin condensate; Alkyl succinate sulfonates such as sodium dialkyl sulfosuccinate, disodium monoalkyl succinate sulfonate; and combinations thereof may be mentioned.

Examples of the nonionic emulsifier include polyoxyalkylene alkyl ethers such as polyoxyalkylene unit-containing ether compounds (for example, polyoxyethylene lauryl ether, polyoxyethylene stearyl ether, polyoxyethylene tridecyl ether, and polyoxyethylene oleyl ether). Compounds; Polyoxyalkylene alkyl phenyl ether compounds such as polyoxyethylene octylphenyl ether and polyoxyethylene nonylphenyl ether; Polyoxyalkylene polycyclic phenyl ether compounds such as polyoxyethylene polycyclic phenyl ether); Polyoxyethylene monolaur Polyoxyalkylene alkyl ester compounds such as rates, polyoxyethylene monostearate, polyoxyethylene monooleates; polyoxyalkylene alkylamine compounds such as polyoxyethylene alkylamines; sorbitan monolaurates, sorbitan monostearate, sorbitan trio Examples include sorbitan compounds such as rates, polyoxyethylene sorbitan monolaurates, polyoxyethylene sorbitan monooleates; and combinations thereof.

As the emulsifier, a reactive emulsifier containing both a polymerizable unsaturated group and an anionic group or a nonionic group in the molecule can also be used. The amount of the emulsifier used can be usually in the range of 0.5 to 6% by mass, preferably 1 to 4% by mass, based on the total mass of the polymerizable unsaturated monomers.

The water-based resin (B1) is contained in the undercoat paint (I) non-volatile content in the range of 5 to 50% by mass, more preferably 10 to 40% by mass in terms of non-volatile content.

Undercoat paint (I):
The undercoat paint (I) is a pigment other than the inorganic pigment (A1), an aqueous resin other than the aqueous resin (B1), a defoaming agent, a cross-linking agent, a curing catalyst, a pigment dispersant, an emulsifier, a film-forming auxiliary, and an increase. Paint additives such as thickeners, neutralizers and preservatives can be included as needed.

In the present invention, the undercoat paint (I) has an elongation rate of 100% or more at break of the formed coating film at 23 ° C., and is preferably in the range of 150 to 400%. By using the undercoat paint (I) having a breaking elongation in the above range, there is an effect of preventing cracks from occurring in the topcoat coating film when the present invention is applied to the housing foundation concrete.

In the present specification, the elongation rate at break of the coating film is the rate at which the coating film is stretched when the coating film having a film thickness of 0.3 mm is pulled at a rate of 20 mm / min until it breaks. The drying conditions of the coating film for the tensile test are 23 ° C. and 50% RH for 14 days, and the atmosphere when measuring the elongation rate is also 23 ° C. and 50% RH.

Undercoat paint (I) painting:
In the painting method of the present invention, when the undercoat paint (I) is applied to the outer surface of the housing foundation concrete, the painting means known per se, for example, a roller, an air spray, an airless spray, a ricing gun, a universal gun, a brush, a trowel, etc. It can be done using the painting equipment of. In particular, it is preferable to paint the undercoat paint (I) using a roller, which is a painting means that causes less paint scattering to the surroundings.

It is desirable that the coating amount of the undercoat paint (I) is usually adjusted to be in the range of 100 to 2000 g / m ² , preferably 200 to 1200 g / m ² .

The undercoat film can usually be dried at room temperature, but may be forcibly dried if necessary. The drying time from the coating of the undercoat paint (I) to the coating of the topcoat paint (II), which is the next step, is preferably 2 to 168 hours, particularly 4 to 72 hours.

<Process (2)>
In the present invention, in the step (2), the topcoat coating film (II) is applied onto the undercoat coating film formed in the above step (1) and dried to have a spotted pattern (hereinafter referred to as a spotted pattern). This is a step of forming a top coat (referred to as a top coat).

The topcoat paint (II) is a paint containing colored paint particles (A2) and a water-based resin (B2) formed by granulating the colored paint.

Colored paint particles (A2):
The colored paint particles (A2) in the present invention are obtained by granulating the colored paint. Examples of the colored paint used as a raw material for producing the colored paint particles (A2) include a conventionally known liquid colored paint containing a colorant (a2-1), an aqueous resin (a2-2), water and, if necessary, an additive. be able to.

Examples of the colorant (a2-1) include a color pigment and a brilliant pigment.
Among these, the coloring pigments include, for example, white pigments such as titanium dioxide; black pigments such as carbon black, acetylene black, lamp black, bone black, graphite, iron black, and aniline black; yellow iron oxide, titanium yellow, and monoazo yellow. , Condensed azo yellow, azomethin yellow, bismus vanadate, benzimidazolone, isoindolinone, isoindrin, quinophthalone, benzidine yellow, permanent yellow and other yellow pigments; permanent orange and other orange pigments; red iron oxide, naphthol AS-based azo red , Ansanthron, Anthracinol Red, Perylene Maroon, Kinacridone Red Pigment, Diketopyrrolopyrrole, Watching Red, Permanent Red, etc. Red Pigment; Cobalt Purple, Kinacridone Violet, Dioxazine Violet, etc. Blue pigments such as blue and slene blue; green pigments such as phthalocyanine green can be mentioned. Glittering pigments include metallic pigments such as aluminum powder, bronze powder, copper powder, tin powder, iron phosphate, and zinc powder; pearl luster pigments such as mica, metal oxide-coated mica powder, and mica-like iron oxide. Can be mentioned. The coloring pigment and the brilliant pigment can be used alone or in combination of two or more.

The type and amount of the colorant (a2-1) used are appropriately adjusted depending on the type of the colorant, and are generally 0.01 to 500% by mass based on the non-volatile content mass of the aqueous resin (a2-2). It can be in the range, preferably in the range of 0.05 to 400% by mass.

Further, in the coloring paint, an extender pigment can be used together with the coloring agent (a2-1). Examples of the extender pigment include barita powder, barium sulfate, barium carbonate, calcium carbonate, gypsum, clay, white carbon, diatomaceous earth, talc, magnesium carbonate, alumina white, gloss white, silica, etc., alone or in two types. The above can be used in combination.

As the water-based resin (a2-2), a water-based resin generally used in the water-based coating field can be used. Specifically, the above-mentioned resin can be mentioned as the water-based resin (B1) contained in the undercoat paint (I). The water-based resin (a2-2) and the water-based resin (B2) may be the same type or different types, but the same type is preferable from the viewpoint of water resistance of the multi-layer coating film, and an acrylic resin, particularly a carbonyl group, is used. It is preferably an acrylic resin containing. The aqueous resin (a2-2) for producing the colored paint particles (A2) has a non-volatile acid value of 20 mgKOH / g or less, more preferably 20 mgKOH / g, from the viewpoint of crack resistance on the outer surface of the housing foundation concrete. It is preferably less than, particularly preferably 10 mgKOH / g or less.

Examples of the additive include a specific gravity adjusting material such as balloon particles, a defoaming agent, a cross-linking agent, a catalyst, a pigment dispersant, a fragrance, a deodorant, an antibacterial agent, a neutralizing agent, a surfactant, an aqueous water repellent agent, and a dispersion. Examples thereof include agents, preservatives, antifungal agents, antifreeze agents, ultraviolet absorbers, light stabilizers, film-forming aids, plasticizers and the like.

The method for producing the colored paint particles (A2) is not particularly limited, and examples thereof include a method in which an aqueous liquid composition containing the colored paint and a water-soluble polysaccharide is brought into contact with an aqueous medium containing a metal compound and stirred.

The water-soluble polysaccharide is a polysaccharide capable of transforming into a water-insoluble or sparingly soluble gel when in contact with a monovalent or polyvalent metal ion in an aqueous medium, and specifically, for example, for example. Examples thereof include alginic acid or an alkali metal salt thereof, gellan gum, carrageenan, and a combination thereof.

The metal compound is a compound capable of producing a monovalent or polyvalent metal ion capable of forming a water-insoluble or sparingly soluble salt with a water-soluble polysaccharide in an aqueous medium, and is a metal species in the metal compound. Group 2 elements of the periodic table such as magnesium, calcium, strontium, and barium can be mentioned, and calcium is particularly preferable.

The metal compound is not particularly limited as long as it is a compound having the above metal species, and is, for example, formic acid, acetic acid, propionic acid, butyric acid, lactic acid, oxalic acid, fumaric acid, succinic acid, phosphoric acid, citric acid, gluconic acid and the like. Metal salts of organic acids; metal hydroxides, metal oxides; metal carbonates; and combinations thereof.

An aqueous medium containing metal ions can be prepared by dissolving at least a part of the metal compound in an aqueous medium such as water. At that time, the metal compound does not have to be completely dissolved in the aqueous medium, and may be partially dissolved.

In the production of the colored paint particles (A2), the stirring speed at the time of contacting the aqueous liquid composition containing the colored paint and the water-soluble polysaccharide with the aqueous medium containing the metal compound is, for example, 500 to 4000 rpm, preferably 700 to 3000 rpm. The range of is appropriate.

The size of the colored paint particles (A2) thus obtained is generally preferably in the range of 0.1 to 20 mm, preferably 0.2 to 10 mm. When the size of the colored paint particles (A2) is within this range, it is possible to give a high-class feeling due to a clear speckled pattern on the outer surface of the housing foundation concrete.

In the present specification, the size of the colored paint particles (A2) is determined by randomly selecting 30 colored paint particles (A2) contained in the top coat (II), observing them with an optical microscope, and calculating the average value thereof. It shall be decided.

In the present invention, the non-volatile content of the colored paint particles (A2) is within the range of 5 to 65% by mass in the topcoat paint (II) non-volatile content from the viewpoint of painting workability, texture of the outer surface of the housing foundation concrete, and the like. It is preferably in the range of 10 to 45% by mass.

Aqueous resin (B2):
In the present invention, the topcoat paint (II) is used as a resin as a binder component for appropriately interspersing the speckled pattern of the colored paint particles (A2) and for protecting the outer surface of the housing foundation concrete which is the object to be coated. Contains water-based resin (B2). As the water-based resin (B2), those generally used in the water-based coating field can be used. Specifically, the above-mentioned resin can be mentioned as the water-based resin (B1) contained in the undercoat paint (I).

In the present invention, the aqueous resin (B2) is preferably an acrylic resin, and particularly preferably a resin containing a carbonyl group.

The amount of the carbonyl group-containing polymerizable unsaturated monomer used to introduce the carbonyl group into the aqueous resin (B2) is 5 to 35 in the fully polymerizable unsaturated monomer used in the production of the aqueous resin (B2). It is preferably in the range of% by mass, particularly 10 to 30% by mass.

Further, the aqueous resin (B2) is preferably core-shell type dispersed particles. Since the multi-layer coating film formed by the coating method of the present invention has excellent alkali resistance due to the core-shell type dispersed particles, it is suitable for coating on a base material showing alkalinity such as housing foundation concrete. It has the effect of being suitable.

In the present invention, when producing core-shell type dispersed particles, for example, a mixture of monomer components forming a core portion is emulsion-polymerized using a polymerization initiator in the presence of an emulsifier to obtain a copolymer. After obtaining an aqueous dispersion, a method of adding a mixture of monomer components forming a shell portion to the aqueous dispersion and emulsion polymerization using a polymerization initiator can be mentioned.

It is desirable that the water-based resin (B2) is contained in the non-volatile content of the top coat (II) in the range of 40 to 95% by mass, particularly 55 to 90% by mass.

Topcoat paint (II):
In the present invention, the topcoat paint (II) preferably contains a cross-linking agent in addition to the colored paint particles (A2) and the aqueous resin (B2). When the topcoat paint (II) contains a cross-linking agent, a multi-layer coating film having both crack resistance and water resistance can be obtained for the outer surface of the housing foundation concrete.
As the cross-linking agent, the water-based resin (B1) contained in the undercoat paint (I), the water-based resin (B2) contained in the topcoat paint (II), and the water-based resin (a2-2) for producing colored paint particles (A2). A compound having a functional group capable of reacting with the functional group of the above is preferable. For example, when any one or more of the aqueous resin (B1), the aqueous resin (B2) and the aqueous resin (a2-2) has a carbonyl group, it is preferable to use a hydrazide compound as a cross-linking agent. Examples of hydrazide compounds include dihydrazide oxalic acid, dihydrazide malonate, dihydrazide succinic acid, dihydrazide glutalide, dihydrazide adipic acid, dihydrazide sevacinate, dihydrazide dodecanoic acid, dihydrazide carbonate, dihydrazid phthalate, dihydrazid phthalic acid, and dihydrazid terephthalic acid. Examples thereof include acid dihydrazide, maleic acid dihydrazide, fumaric acid dihydrazide, itaconic acid dihydrazide, 1,3-bis (hydradinocarboethyl) -5-isopropylhydranthin, and combinations thereof.

The topcoat paint (II) may contain an extender pigment, a matting agent such as resin beads, a brilliant pigment, and an additive for a paint, if necessary.

As an example of the extender pigment that can be used as the matting agent, the substance exemplified as the extender pigment in the description of the colored paint particles (A2) can be similarly mentioned. On the other hand, examples of the resin beads include acrylic resin beads, urethane resin beads, polyester resin beads, polyamide resin beads, polystyrene resin beads, polyethylene resin beads, melamine resin beads, urea resin beads, fluororesin beads, polyacrylonitrile resin beads and the like. Can be mentioned. By including the matting agent in the topcoat paint (II), the outer surface of the concrete of the foundation of the house can be finished in a unique atmosphere in which the high-class feeling of the speckled pattern and the depth of the matting are in harmony.

When the topcoat paint (II) contains a matting agent, the content is 100 parts of the water-based resin (B2) non-volatile content contained in the topcoat paint (II) from the viewpoint of crack resistance on the outer surface of the housing foundation concrete. As a reference, it is preferable that the matting agent is adjusted in the range of 0.5 to 30 parts by mass, particularly 5 to 20 parts by mass.

Examples of paint additives that can be contained in the topcoat paint (II) include neutralizers, viscosity regulators, antisettling agents, antibacterial agents, curing catalysts, pH regulators, dispersants, defoamers, preservatives, and the like. Examples thereof include antifungal agents, antifreeze agents, ultraviolet absorbers, light stabilizers, film-forming aids, and plasticizers.

The viscosity of the topcoat paint (II) obtained as described above is preferably in the range of 100 KU or more, preferably 110 to 150 KU at 25 ° C. When the viscosity of the topcoat paint (II) is within this range, a speckled pattern with little bias can be obtained even if the shape has fine uneven surfaces such as the outer surface of the housing foundation concrete. The viscosity of the topcoat paint (II) shall be measured according to the JIS K 5600-2-2 stoma viscometer method.

Topcoat paint (II) painting:
The topcoat paint (II) can be painted using a painting instrument known per se, for example, a roller, an air spray, an airless spray, a ricing gun, a universal gun, a brush, a trowel and the like. When the topcoat paint (II) is applied to the outer surface of the housing foundation concrete using a roller, which is a coating means that applies pressure to the coated surface during painting, individual spots are clear and a spot pattern with little bias can be obtained. ..

It is desirable that the amount of the top coat (II) applied is usually adjusted to be in the range of 50 to 1500 g / m ² , preferably 100 to 1000 g / m ² .

The formed topcoat coating film can usually be dried at room temperature, but may be forcibly dried if necessary. The drying time is preferably 1 hour or more, particularly 2 hours or more.

In the method of the present invention, a step of applying the top coat paint (II) and further applying the top coat paint after drying may be provided as necessary.

As the topcoat paint for recoating, a paint containing the same colored paint particles and a water-based resin as the topcoat paint (II) is preferable, and a paint having the same composition as the topcoat paint (II) may be repainted, and the finished appearance may be repainted. Another topcoat paint having a different composition of colored paint particles may be applied to enhance the texture of the paint.
The present invention includes a method for producing a painted outer surface of a residential foundation concrete using the above coating method or a method for producing a coating coated on the outer surface of a residential foundation concrete.

Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to these Examples. In addition, "part" and "%" in the following example mean "part by mass" and "% by mass", respectively.

Production Example 1 of Water-based Resin (B1) for Manufacturing Undercoat Paint (I)
485 parts of deionized water and 1 part of "Newcol 707SF" (Note 1) were added to a 4-necked flask having a capacity of 3 liters, and the temperature was maintained at 85 ° C. after nitrogen substitution. To that, add 3% of the pre-emulsion having the following composition and 40 parts of 120 parts of the initiator aqueous solution obtained by mixing 3 parts of ammonium persulfate and 117 parts of deionized water, and after stirring for 20 minutes, the rest. The preemulsion of the above and the aqueous initiator solution were added dropwise to the flask over 4 hours.
Pre-emulsion deionized water 368 parts "Neucol 707SF" (Note 1) 67 parts styrene 150 parts methyl methacrylate 300 parts n-butyl acrylate 300 parts 2-ethylhexyl acrylate 200 parts 2-hydroxyethyl acrylate 15 parts diacetone acrylamide 20 parts acrylic After 15 parts of the acid was added dropwise, the mixture was further stirred at 85 ° C. for 2 hours, and then the temperature was lowered to 40 to 60 ° C. Next, the pH was adjusted with aqueous ammonia to obtain an aqueous resin (B1-1) having a non-volatile content of 50% and in the form of dispersed particles.
(Note 1) "Newcol 707SF": Trade name, manufactured by Nippon Emulsifier Co., Ltd., anionic emulsifier having a polyoxyethylene chain, non-volatile content 30%.

Production Examples 2-3
In Production Example 1, aqueous resins (B1-2) to (B1-3) were obtained in the same manner as in Production Example 1 except that the monomer compositions are shown in Table 1.

Production of undercoat paint (I) Production example 4
In a stainless steel container with a capacity of 1 liter, 115 parts of clean water, 200 parts of the aqueous resin (B1-1) synthesized in Production Example 1, 5 parts of "Nopco Santo K" (Note 2), 100 parts of titanium oxide, and 150 parts of calcium carbonate are sequentially placed. After adding the mixture with stirring, stirring was performed until the mixture became uniform. After that, 12 parts of 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate, 5 parts of "BYK-024" (Note 3), 10 parts of 10% adipic acid dihydrazide aqueous solution, "PRIMAL ASE-60". (Note 4) Three parts were added and stirred until uniform to obtain an undercoat paint (I-1).
(Note 2) "Nopco Santo K": Trade name, manufactured by San Nopco Ltd., sodium polycarboxylic acid dispersant, non-volatile content 33%
(Note 3) "BYK-024": Product name, BYK Chemie, silicone defoamer, non-volatile content 96% or more (Note 4) "PRIMAL ASE-60": Product name, Dow Chemical, anion Alkaline swelling thickener, non-volatile content 28%

Production Examples 5 to 10
Undercoating paints (I-2) to (I-7) were obtained in the same manner as in Production Example 4 except that the compounding composition was shown in Table 2 in Production Example 4.

Breaking elongation rate Each of the undercoat paints shown in Table 2 was applied to a release paper so that the dry film thickness was 0.3 mm, and dried in an atmosphere of 23 ° C. and 50% RH for 14 days. Then, the coating film was peeled off from the release paper so as not to damage the coating film, and the coating film was cut into strips having a width of 5 mm and a length of 20 mm to obtain a test piece. This test piece was attached to a tensile tester (trade name "Autograph AG2000B type" manufactured by Shimadzu Corporation), and a tensile test was performed under the conditions of a chuck distance of 40 mm and a tensile speed of 20 mm / min in an atmosphere of 23 ° C. It was evaluated by the growth rate.

Production Example 11 of Production of Aqueous Resin (a2-2) for Production of Colored Paint Particles (A2)
485 parts of deionized water and 1 part of "Newcol 707SF" (Note 1) were added to a 4-necked flask having a capacity of 3 liters, and the temperature was maintained at 85 ° C. after nitrogen substitution. To that, add 3% of the pre-emulsion having the following composition and 40 parts of 120 parts of the initiator aqueous solution obtained by mixing 3 parts of ammonium persulfate and 117 parts of deionized water, and after stirring for 20 minutes, the rest. The preemulsion of the above and the aqueous initiator solution were added dropwise to the flask over 4 hours.
Pre-emulsion deionized water 368 parts Neucol 707SF (Note 1) 67 parts styrene 150 parts methyl methacrylate 400 parts n-butyl acrylate 200 parts 2-ethylhexyl acrylate 200 parts 2-hydroxyethyl acrylate 26 parts diacetone acrylamide 20 parts acrylic acid 4 parts After the dropping was completed, the mixture was further stirred at 85 ° C. for 2 hours, and then the temperature was lowered to 40 to 60 ° C. Next, the pH was adjusted with aqueous ammonia to obtain an aqueous resin (a-1) having a non-volatile content of 50% and a non-volatile acid value of 3.1 mgKOH / g in the form of dispersed particles.

Production Example 12
485 parts of deionized water and 1 part of "Newcol 707SF" (Note 1) were added to a 4-necked flask having a capacity of 3 liters, and the temperature was maintained at 85 ° C. after nitrogen substitution. To that, add 3% of the pre-emulsion having the following composition and 40 parts of 120 parts of the initiator aqueous solution obtained by mixing 3 parts of ammonium persulfate and 117 parts of deionized water, and after stirring for 20 minutes, the rest. The preemulsion of the above and the aqueous initiator solution were added dropwise to the flask over 4 hours.
Pre-emulsion deionized water 368 parts Neucol 707SF (Note 1) 67 parts styrene 150 parts methyl methacrylate 400 parts n-butyl acrylate 200 parts 2-ethylhexyl acrylate 200 parts 2-hydroxyethyl acrylate 18 parts diacetone acrylamide 20 parts acrylic acid 12 parts After the partial dropping was completed, the mixture was further stirred at 85 ° C. for 2 hours, and then the temperature was lowered to 40 to 60 ° C. Next, the pH was adjusted with aqueous ammonia to obtain an aqueous resin (a-2) having a non-volatile content of 50% and a non-volatile acid value of 9.4 mgKOH / g in the form of dispersed particles.

Production of white paste Production example 13
The following components were sequentially charged into a 1-liter stainless steel container, stirred and mixed with a stirrer for 30 minutes, filtered through a 100-mesh nylon cloth, and discharged to produce a white paste.
Water 300 parts Hydroxyethyl cellulose 2 parts "SN Deformer 777" (Note 5) 10 parts "DISPER BYK-190" (Note 6) 20 parts Titanium dioxide 600 parts (Note 5) "SN Deformer 777": Product name, manufactured by San Nopco Ltd. , Antifoaming agent (Note 6) "DISPER BYK-190": Trade name, manufactured by BYK Chemie, pigment dispersant

Production of black paste Production example 14
The following components were sequentially charged into a 1-liter stainless steel container, stirred and mixed with a stirrer for 30 minutes, filtered through a 100-mesh nylon cloth, and discharged to produce a black paste.
Water 300 parts Hydroxyethyl cellulose 2 parts "SN deformer 777" (Note 5) 10 parts "DISPER BYK-190" (Note 6) 20 parts Carbon black 30 parts

Production Example 15 of Aqueous Liquid Composition for Production of Colored Paint Particles (A2)
The following components were sequentially charged into a 1-liter stainless steel container and stirred and mixed with a stirrer so as to be uniform to obtain an aqueous liquid composition (C-1) for colored paint particles.
Aqueous resin (a-1) 200 parts white paste 100 parts 10% adipic acid dihydrazide aqueous solution 10 parts 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate 12 parts "BYK-024" (Note 3) 6 parts "Adecanol UH-420" (Note 8) 2 parts 2% sodium alginate aqueous solution 370 parts

Production Examples 16-19
Aqueous liquid compositions (C-2) to (C-5) for producing colored paint particles were obtained in the same manner as in Production Example 15 except that the compounding composition was shown in Table 3 below.

(Note 7) Iriodin 103W2: Trade name ,: Made by Merck, titanium dioxide coated mica pigment,
(Note 8) Adecanol UH420: Trade name, manufactured by Asahi Denka Co., Ltd., a modified material of polyether urethane, a viscosity modifier.

Production of aqueous medium for production of colored paint particles (A2):
Production Example 20
After adding 994 parts of deionized water to a stainless steel container having a capacity of 3 liters, 3 parts of calcium hydroxide and 3 parts of "SN Deformer 777" (Note 5) were charged and stirred for 3 minutes to produce an aqueous medium.

Manufacture of colored paint particles (A2):
Production Example 21
After 1000 parts of the aqueous medium obtained in Production Example 20 is attached to a stirrer having a stirring blade having a diameter of 75 mm, the aqueous liquid composition for colored paint particles obtained in Production Example 15 is stirred while stirring at a rotation speed of 2000 rpm. (C-1) 450 parts were gradually dropped into the container to generate colored paint particles. Next, the liquid in the container was further stirred at the same rotation speed for 5 minutes and then filtered using an 80 mesh wire mesh to obtain colored paint particles (A2-1) having a non-volatile content of 20%.

Production Examples 22 to 25
Colored paint particles (A2-2) to (A2-5) were produced in the same manner as in Production Example 21 except that the aqueous liquid composition was as shown in Table 4 in Production Example 21.

Manufacture of water-based resin (B2) for manufacturing topcoat paint (II):
Production Example 26
485 parts of deionized water and 1 part of "Newcol 707SF" (Note 1) were added to a 4-necked flask having a capacity of 3 liters, and the temperature was maintained at 85 ° C. after nitrogen substitution. To that, add 3% of the pre-emulsion having the following composition and 40 parts of 120 parts of the initiator aqueous solution obtained by mixing 3 parts of ammonium persulfate and 117 parts of deionized water, and after stirring for 20 minutes, the rest. The preemulsion of the above and the aqueous initiator solution were added dropwise to the flask over 4 hours.
Pre-emulsion deionized water 368 parts Neucol 707SF (Note 1) 67 parts Methyl methacrylate 550 parts n-butyl acrylate 200 parts 2-ethylhexyl acrylate 200 parts 2-hydroxyethyl acrylate 36 parts Diacetone acrylamide 10 parts Acrylic acid 4 parts Dropping completed Then, after further stirring at 85 ° C. for 2 hours, the temperature was lowered to 40 to 60 ° C. Next, the pH was adjusted with aqueous ammonia to obtain an aqueous resin (B2-1) having a non-volatile content of 50% and in the form of dispersed particles.

Production example 27
485 parts of deionized water and 1 part of "Newcol 707SF" (Note 1) were added to a 4-necked flask having a capacity of 3 liters, and the temperature was maintained at 85 ° C. after nitrogen substitution. Add 3% of the preemulsion (for core) having the following composition and 40 parts of 120 parts of the initiator aqueous solution obtained by mixing 3 parts of ammonium persulfate and 117 parts of deionized water, and stir for 20 minutes. After that, the remaining preemulsion (for core) and the initiator aqueous solution were added dropwise to the flask over 3 hours.

<Pre-emulsion composition (for core)>
Deionized water 300 parts Methyl methacrylate 350 parts n-Butyl acrylate 230 parts 2-Ethylhexyl acrylate 100 parts 2-Hydroxyethyl acrylate 13 parts Vinyl triethoxysilane 6 parts Acrylic acid 1 part "Newcol 707SF" (Note 1) 46 parts Dropped After completion, this was further aged at 85 ° C. for 2 hours, and then a preemulsion (for shell) obtained by emulsifying the components having the following composition and 25% of the above ammonium persulfate aqueous solution were added dropwise over 2 hours.

<Pre-emulsion composition (for shell)>
Deionized water 200 parts Methyl methacrylate 200 parts n-Butyl acrylate 41 parts 2-Ethylhexyl acrylate 15 parts Diacetone acrylamide 15 parts Hydroxyethyl acrylate 6 parts Vinyl triethoxysilane 2 parts Acrylic acid 4 parts "Newcol 707SF" (Note 1) After the completion of dropping 20 parts, the temperature was kept at 85 ° C. for another 2 hours, and then the temperature was lowered to 40 to 60 ° C. Then, the pH was adjusted with aqueous ammonia to obtain a core-shell emulsion (B2-2) having a non-volatile content of 50% and in the form of dispersed particles.

Topcoat paint (II) Manufacture example of water-based clear paint for manufacturing 28-30
Water-based clear paints (D-1) to (D-3), which are binder components of the topcoat paint (II), were produced with the composition shown in Table 5 below.

(Note 9) Silysia 350: Product name, manufactured by Fuji Silysia Chemical Ltd., silica

Manufacture of topcoat paint (II):
Production Example 31
Put 200 parts of water-based clear paint (D-1), 65 parts of colored paint particles (A2-1), 20 parts of colored paint particles (A2-2), and 10 parts of colored paint particles (A2-3) in a container and stir. While doing so, add 1 part of "BYK-024" (Note 3), 2 parts of 10% adipic acid dihydrazide aqueous solution, and 2 parts of "PRIMAL ASE-60" (Note 4), stir to make the whole uniform, and top coat. Paint (II-1) was manufactured.

Production Examples 32 to 37
In the above-mentioned production example 31, the topcoat paints (II-2) to (II-7) were produced in the same manner except that the compounding composition is shown in Table 6.

Painting Example 1
The outer surface of the foundation concrete prepared by placing concrete and removing the formwork was coated with the undercoat paint (I-1) with a porous roller so that the coating amount was 600 g / m ² , and the temperature was 23 ° C. 50. It was dried for 24 hours in an atmosphere of% RH. After that, apply the topcoat paint (II-1) on the undercoat film so that the amount of the topcoat paint (II-1) is 400 g / m ² , and move the porous roller 10 times at the same place to check the degree of crushing of the spots. The test piece was prepared by recoating and drying in an atmosphere of 23 ° C. and 50% RH for 7 days.

Examples 2 to 7, 10 to 13 and Comparative Examples 1 to 3
A test body was prepared in the same manner as in Example 1 except that the paint used in Example 1 was as shown in Table 7 below. Comparative Example 3 is an example in which the undercoat paint (I) is not applied.

Example 8
Example 8 is an example in which the top coat paint (II-1) is painted and dried, and then the same top coat paint (II-1) is repainted in order to confirm the repairability of the top coat paint (II). be.
The outer surface of the foundation concrete prepared by placing concrete and removing the formwork was coated with the undercoat paint (I-1) with a porous roller so that the coating amount was 600 g / m ² , and the temperature was 23 ° C. 50. It was dried for 24 hours in an atmosphere of% RH. Then, the topcoat paint (II-1) is applied over the undercoat coating film by rotating a porous roller 10 times so that the coating amount becomes 400 g / m ² , and dried in an atmosphere of 23 ° C. and 50% RH for 7 days. I let you. Then, the topcoat paint (II-1) is applied over the topcoat coating film by rotating the pore roller 10 times so that the coating amount becomes 400 g / m ² , and dried in an atmosphere of 23 ° C. and 50% RH for 7 days. A test piece was obtained.

Example 9
In Example 9, the top coat paint (II-1) was applied and dried in order to enhance the profound feeling in addition to the repairability of the top coat paint (II), and then another top coat paint (II-5) was applied repeatedly. This is an example.
A test piece was obtained in the same manner as in Example 8 except that the topcoat paint (II-5) was used instead of the topcoat paint (II-1) to be overcoated.

Evaluation test A finish test was performed on the test piece obtained above. For water resistance, alkali resistance, crack resistance, and weather resistance tests, test boards were prepared using a flexible board (fiber reinforced cement board), which is a material similar to concrete, as a base material, and evaluated according to the following criteria. The results are also shown in Table 7.

(* 1) Finishability The appearance of the test piece (spot bias and crushing condition) was visually evaluated.
⊚: There is no bias in the spot pattern due to fine irregularities, and the spot pattern is clear.
〇: The spot pattern is slightly biased in the recesses, but the spot pattern is clear.
Δ: The spot pattern is remarkably biased to the concave portion and is slightly unclear. ×: The spot pattern is unclear and monotonous.
(* 2) Each of the undercoat paints shown in Table 2 was applied to the surface of the water-resistant flexible plate with a porous roller so that the coating amount was 600 g / m ² , and dried in an atmosphere of 23 ° C. and 50% RH for 24 hours. .. Then, each of the topcoat paints shown in Table 6 was applied over the undercoat coating film with a porous roller so that the coating amount was 400 g / m ² , dried in an atmosphere of 23 ° C. and 50% RH for 7 days, and the test plate was placed. Made. The appearance of this test plate after being immersed in clean water at 23 ° C. for 96 hours was visually evaluated according to the following criteria.
⊚: No swelling or peeling, and no whitening of the coating film was observed.
◯: Slight whitening of the coating film is observed, but there is no swelling or peeling.
Δ: A part of the coating film is swollen or peeled off, and the coating film is whitened.
X: Swelling or peeling is observed on the entire surface of the coating film, and whitening of the coating film is observed.
(* 3) Alkali resistance The surface of the flexible plate was coated with each of the undercoat paints shown in Table 2 with a porous roller so that the coating amount was 600 g / m ² , and dried in an atmosphere of 23 ° C. and 50% RH for 24 hours. .. Then, each of the topcoat paints shown in Table 6 was applied over the undercoat coating film with a porous roller so that the coating amount was 400 g / m ² , dried in an atmosphere of 23 ° C. and 50% RH for 7 days, and the test plate was placed. Made. The appearance of this test plate after being immersed in a saturated calcium hydroxide aqueous solution at 23 ° C. for 48 hours was visually evaluated according to the following criteria.
⊚: No swelling or peeling, and no whitening of the coating film was observed.
◯: Slight whitening of the coating film is observed, but there is no swelling or peeling.
Δ: A part of the coating film is swollen or peeled off, and the coating film is whitened.
X: Swelling or peeling is observed on the entire surface of the coating film, and whitening of the coating film is observed.
(* 4) Crack resistance Each undercoat paint shown in Table 2 has a dry film thickness of 0.5 mm on the surface of a plate with a groove with a width of 1 mm and a depth of 3 mm in the center of the back surface of the flexible plate. And dried for 24 hours in an atmosphere of 23 ° C. and 50% RH. Then, each of the topcoat paints shown in Table 6 was coated so that the dry film thickness was 0.1 mm, and dried in an atmosphere of 23 ° C. and 50% RH for 14 days. After that, the groove in the center of the back surface of the flexible plate is pressed with a finger so as not to damage the coating film, and only the flexible plate is broken to make a test piece, and this test piece is used as a tensile tester (trade name, "Autograph"). It was attached to "AG2000B type" manufactured by Shimadzu Corporation), and a tensile test was conducted under the condition of a tensile speed of 1 mm / min in an atmosphere of 23 ° C. and evaluated by the length of elongation.
⊚: 2.0 mm or more.
◯: 1.0 to less than 2.0 mm.
Δ: 0.5 to less than 1.0 mm.
X: Less than 0.5.
(* 5) Accelerated weather resistance The surface of the flexible plate is coated with each of the undercoat paints shown in Table 2 with a porous roller so that the coating amount is 600 g / m ² , and dried in an atmosphere of 23 ° C. and 50% RH for 24 hours. rice field. Then, each of the topcoat paints shown in Table 6 was applied over the basecoat paint with a porous roller so that the coating amount was 400 g / m ² , and dried in an atmosphere of 23 ° C. and 50% RH for 7 days to prepare a test plate. did. Then, the obtained test plate was subjected to a 2000-hour test according to JIS K 5600-7-7 (xenon lamp method), and the appearance of the coating film after the test was visually evaluated according to the following criteria.
⊚: No glossiness, swelling, peeling, or cracking is observed.
◯: Slight glossiness is observed, but there is no swelling, peeling, or cracking.
Δ: At least one of glossy or swelling, peeling, or cracking is observed.
X: At least one of remarkable glossiness or swelling, peeling, or cracking is observed on the entire surface of the coating film.

Claims (13)

In the steps (1) and (1) of applying an undercoat paint (I) containing an inorganic pigment (A1) and a water-based resin (B1) to the outer surface of the housing foundation concrete and drying it to form an undercoat coating film. A topcoat paint (II) containing colored paint particles (A2) and an aqueous resin (B2) formed by granulating the colored paint is coated on the obtained undercoat paint, and dried to form a spotted topcoat. Including the step (2)
The amount of the inorganic pigment (A1) contained in the undercoat paint (I) is 100 parts by mass or more with respect to 100 parts by mass of the resin non-volatile content of the aqueous resin (B1), and the coating film is formed by the undercoat paint (I). The elongation rate of the film at break at 23 ° C. is 100% or more.
How to paint the outer surface of the concrete of the foundation of a house. The coating method according to claim 1, wherein the water-based resin (B1) is an acrylic resin and is a resin obtained by an emulsion polymerization method. The coating method according to claim 1 or 2, wherein the aqueous resin (B1) contains a carbonyl group. The coating method according to any one of claims 1 to 3, wherein the glass transition temperature of the resin of the aqueous resin (B1) is 25 ° C. or lower. The coating method according to any one of claims 1 to 4, wherein the undercoat paint (I) is coated using a roller. A water-based liquid composition in which the colored paint particles (A2) contained in the topcoat paint (II) contain a colorant (a2-1), a water-based resin (a2-2), a colored paint containing water, and a water-soluble polysaccharide. The coating method according to any one of claims 1 to 5, which is obtained by contacting with an aqueous medium containing a metal compound and stirring the mixture. The coating method according to claim 6, wherein the non-volatile acid value of the aqueous resin (a2-2) is 20 mgKOH / g or less. The coating method according to any one of claims 1 to 7, wherein the topcoat paint (II) contains a water-based resin (B2) as a binder component, and the water-based resin (B2) contains a carbonyl group. The coating method according to any one of claims 1 to 8, wherein the water-based resin (B2) is a core-shell type dispersed particle. The coating method according to any one of claims 1 to 9, wherein the topcoat paint (II) has a viscosity of 100 KU or more at 25 ° C. The coating method according to any one of claims 1 to 10, wherein the top coat paint (II) is coated using a roller. The coating method according to any one of claims 1 to 11, wherein the topcoat paint is further applied on the topcoat coating film formed in the step (2). In the steps (1) and (1) of applying an undercoat paint (I) containing an inorganic pigment (A1) and a water-based resin (B1) to the outer surface of the housing foundation concrete and drying it to form an undercoat coating film. A topcoat paint (II) containing colored paint particles (A2) and an aqueous resin (B2) formed by granulating the colored paint is coated on the obtained undercoat paint, and dried to form a spotted topcoat. Including the step (2)
The amount of the inorganic pigment (A1) contained in the undercoat paint (I) is 100 parts by mass or more with respect to 100 parts by mass of the resin non-volatile content of the aqueous resin (B1), and the coating film is formed by the undercoat paint (I). The elongation rate of the film at break at 23 ° C. is 100% or more.
How to manufacture the outer surface of painted residential foundation concrete.