Painting method for the exterior surface of residential concrete foundations

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

[Technical Field]

[0001] This invention relates to a method for painting the outer surface of a residential foundation concrete. [Background technology]

[0002] The foundation of a house is the base that supports the house, and is usually made of reinforced concrete. Because this part of the house foundation, or concrete foundation, is located close to the ground, it is constantly exposed to moisture from rainwater and ground surface moisture, and is subjected to the harshest conditions among the components that make up a house. Furthermore, if the concrete cracks due to aging deterioration, moisture can penetrate into the foundation, leading to problems such as rust on the reinforcing steel or the progression of concrete carbonation. For these reasons, in recent years, it has become common practice to paint concrete foundations to suppress the aging deterioration of concrete foundations.

[0003] Regarding methods for painting residential foundation concrete, for example, Patent Document 1 discloses a finishing method in which a polymer cement-based primer is applied to the residential foundation concrete surface, and then a water vapor permeable finishing coating is laminated. This finishing method can provide a protective coating to the residential foundation concrete surface that is less prone to blistering and peeling, but it has drawbacks in terms of painting workability because it requires trowel application to apply a thick layer of the polymer cement-based primer.

[0004] Furthermore, Patent Document 2 discloses a painting method for applying a water-based topcoat to the concrete foundation surface of a house, in which an acrylic resin derived from (meth)acrylate ester and a silicone resin derived from a cyclic siloxane compound are mixed within the particles as a binder. While the painting method described in Patent Document 2 can protect the concrete foundation surface of a house for a long period of time, there is a problem in that cracks occur when the amount of water-based topcoat applied is insufficient.

[0005] Incidentally, in recent years, with the diversification of user preferences, there has been a growing demand for houses with original exterior designs. Therefore, there is a need for painting specifications that can create a unique appearance even on the exterior surface of the house's foundation.

[0006] In Patent Documents 3 and 4, the applicant proposed a painting method for imparting aesthetic appeal to the interior and exterior walls of buildings, using a multi-colored pattern paint containing particles of multiple colors as a topcoat. However, when the painting methods described in Patent Documents 3 and 4 are applied directly to the concrete foundation surface of a house, the particle-like appearance of the multi-colored pattern is reduced, and blistering or cracking occurs in the paint film over time, resulting in an unsatisfactory appearance. [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] Japanese Patent Publication No. 2002-161625 [Patent Document 2] Japanese Patent Publication No. 2008-12454 [Patent Document 3] Japanese Patent Publication No. 2008-114112 [Patent Document 4] Japanese Patent Publication No. 2008-155119 [Disclosure of the Invention] [Problems that the invention aims to solve]

[0008] When paint is applied to the concrete surface of a house foundation, defects such as blistering and peeling can occur in the paint film due to factors such as rainwater splashing off the ground coming into contact with the paint film, or moisture absorbed from the ground being released from the surface of the concrete foundation. In addition, concrete deteriorates over time and develops cracks, so cracks may also occur in the paint film applied to the surface of a concrete house foundation.

[0009] The objective of this invention is to propose a painting method suitable for enhancing the protective function of the outer surface of residential foundation concrete while also providing a high-quality appearance. [Means for solving the problem]

[0010] The inventors diligently studied paint compositions for coating the exterior surface of residential concrete foundations. As a result, they discovered that by applying a primer paint in which the amount of inorganic pigment and the elongation rate at the time of film breakage are within a specific range, followed by a topcoat paint containing granular colored paint particles and a binder resin, a high-quality appearance with moderately scattered speckles and no defects such as blistering or cracking can be easily obtained.

[0011] In other words, the present invention is Item 1 Step (1) involves applying an undercoat paint (I) containing an inorganic pigment (A1) and a water-based resin (B1) to the outer surface of the concrete foundation of a house, and allowing it to dry to form an undercoat film, and The process includes step (2) of applying a topcoat paint (II) containing colored paint particles (A2) formed by granulating colored paint and a water-based resin (B2) onto the undercoat film obtained in step (1), and drying it to form a topcoat film with a spotted pattern. The amount of inorganic pigment (A1) contained in the undercoat paint (I) is 100 parts by mass or more per 100 parts by mass of the non-volatile content of the water-based resin (B1), and the elongation at break of the coating film formed by the undercoat paint (I) at 23°C is 100% or more. Painting method for the exterior surface of residential concrete foundations. Section 2 The coating method according to item 1, wherein the water-based resin (B1) is an acrylic resin obtained by emulsion polymerization. Section 3 The coating method according to item 1 or 2, wherein the aqueous resin (B1) contains a carbonyl group. Section 4 The coating method described in any one of items 1 to 3, wherein the glass transition temperature of the water-based resin (B1) is 25°C or lower. Section 5 The coating method according to any one of claims 1 to 4, wherein the primer paint (I) is applied using a roller. Claim 6 The coating method according to any one of claims 1 to 5, wherein the colored paint particles (A2) contained in the topcoat paint (II) are obtained by contacting and stirring an aqueous liquid composition containing a colored paint containing a colorant (a2-1), an aqueous resin (a2-2) and water, and a water-soluble polysaccharide, with an aqueous medium containing a metal compound. Claim 7 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. Claim 8 The coating method according to any one of claims 1 to 7, wherein the topcoat paint (II) contains an aqueous resin (B2) as a binder component, and the aqueous resin (B2) contains a carbonyl group. Claim 9 The coating method according to any one of claims 1 to 8, wherein the aqueous resin (B2) is core-shell type dispersed particles. Claim 10 The coating method according to any one of claims 1 to 9, wherein the viscosity of the topcoat paint (II) at 25 °C is 100 KU or more. Claim 11 The coating method according to any one of claims 1 to 10, wherein the topcoat paint (II) is applied using a roller. Claim 12 The coating method according to any one of claims 1 to 11, wherein a topcoat paint is further applied over the topcoat film formed in step (2). Claim 13 Step (1) of applying a primer paint (I) containing an inorganic pigment (A1) and an aqueous resin (B1) to the outer surface of a residential foundation concrete and drying to form a primer film, and Step (2) of applying a topcoat paint (II) containing colored paint particles (A2) obtained by granulating a colored paint and an aqueous resin (B2) over the primer film obtained in step (1) and drying to form a spotted topcoat film, The amount of inorganic pigment (A1) contained in the undercoat paint (I) is 100 parts by mass or more per 100 parts by mass of the non-volatile content of the water-based resin (B1), and the elongation at break of the coating film formed by the undercoat paint (I) at 23°C is 100% or more. A method for manufacturing the painted exterior surface of residential foundation concrete. Regarding. [Effects of the Invention]

[0012] According to the painting method of the present invention, it is possible to protect the concrete foundation of a house for a long period of time and to give the outer surface of the concrete foundation a mottled, high-quality appearance. [Modes for carrying out the invention]

[0013] <Object to be coated> The object to which the present invention's coating method is applied is residential foundation concrete. Residential foundation concrete is typically formed by installing formwork at the site of the house, placing reinforcing bars to increase strength within the formwork, pouring ready-mix concrete, allowing it to cure, and then removing the formwork. The formed surface of residential foundation concrete can be classified into an outer surface and an inner surface, but the present invention's method applies to the outer surface. The outer surface of residential foundation concrete refers to the surface visible from outside the house, while the inner surface refers to surfaces not visible from outside the house, such as the concrete foundation portion under the floor. The outer surface of the residential foundation concrete may be flat, or it may have fine irregularities for decorative purposes. Furthermore, it may be pre-treated with a sealer or primer to improve the adhesion of the coating film by the undercoat paint (I) described later.

[0014] <Process (1)> In the present invention's painting method, as 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 concrete foundation of the house, and the mixture is allowed to dry to form an undercoat film.

[0015] Inorganic pigment (A1): Examples of the inorganic pigment (A1) include titanium dioxide, carbon black, zinc oxide, zinc sulfide, barium sulfate, calcium carbonate, chromium oxide, silica, red iron oxide, mica, talc, gypsum, clay, white carbon, diatomaceous earth, magnesium carbonate, alumina white, gloss white, and the like.

[0016] In the present invention, it is important that the amount of inorganic pigment (A1) contained in the undercoat paint (I) is 100 parts by mass or more per 100 parts by mass of the non-volatile content of the aqueous resin (B1) contained in the undercoat paint (I), and is particularly suitable to be in the range of 120 to 500 parts by mass.

[0017] In this specification, "non-volatile content" refers to the residue remaining after removing volatile components such as water and organic solvents, and is the component that forms the coating film. For example, when measuring the mass of non-volatile content, a drying condition for the sample is to heat 1 gram of the sample in a 110°C oven for 1 hour.

[0018] The amount of inorganic pigment (A1) contained in the primer (I) is 100 parts by mass or more per 100 parts by mass of the non-volatile content of the water-based resin (B1), which has the effect of suppressing defects such as blistering and whitening that occur over time in the multi-layer coating film provided on the outer surface of the concrete foundation of a house according to the present invention.

[0019] Water-based resin (B1): As the water-based resin (B1) that serves as the binder component of the primer paint (I), a resin that is soluble or dispersible in water is used. There are no particular limitations on the type of resin, but specifically, examples include acrylic resins, polyolefin resins, silicone resins, polyurethane resins, epoxy resins, phenolic resins, polyester resins, alkyd resins, polycarbonate resins, etc. These can be used individually or in combination of two or more types, and two or more of these resins may be modified or graft polymerized. Furthermore, if the water-based resin (B1) is in the form of dispersed particles, it may be in a single layer or a multilayer structure such as a core-shell type.

[0020] As the water-based resin (B1), an acrylic resin is preferred from the viewpoint of water resistance, crack resistance, and weather resistance of the multi-layer coating film applied to the outer surface of the concrete foundation of a house. Preferably, 70% by mass or more of the water-based resin (B1) is an acrylic resin.

[0021] Examples of the aforementioned acrylic resin include resins obtained by copolymerizing polymerizable unsaturated monomers mainly composed of (meth)acrylate compounds. Examples of such polymerizable unsaturated monomers include alkyl(meth)acrylates such as methyl(meth)acrylate, ethyl(meth)acrylate, n-propyl(meth)acrylate, isopropyl(meth)acrylate, n-butyl(meth)acrylate, 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, stearyl(meth)acrylate, and isostearyl(meth)acrylate; Cycloalkyl (meth)acrylates such as cyclohexyl (meth)acrylate, methylcyclohexyl (meth)acrylate, t-butylcyclohexyl (meth)acrylate, and cyclododecyl (meth)acrylate; (Meth)acrylates having an isobornyl group, such as isobornyl (meth)acrylate; (meth)acrylates having an adamantyl group, such as adamantyl (meth)acrylate; vinyl aromatic compounds such as styrene, α-methylstyrene, and vinyltoluene; (Meth)acrylic acid, maleic acid, crotonic acid, itaconic acid, β-carboxyethyl acrylate, and other carboxyl group-containing polymerizable unsaturated monomers; Polymerizable unsaturated monomers having an alkoxysilyl group, such as vinyltrimethoxysilane, vinyltriethoxysilane, vinyltris(2-methoxyethoxy)silane, γ-(meth)acryloyloxypropyltrimethoxysilane, and γ-(meth)acryloyloxypropyltriethoxysilane; Perfluoroalkyl (meth)acrylates such as perfluorobutyl ethyl (meth)acrylate and perfluorooctyl ethyl (meth)acrylate; polymerizable unsaturated monomers having fluorinated alkyl groups such as fluoroolefins; Monomers having photopolymerizable functional groups such as maleimide groups; Nitrogen-containing polymerizable unsaturated monomers such as (meth)acrylonitrile, (meth)acrylamide, N,N-dimethylaminoethyl (meth)acrylate, N,N-dimethylaminopropyl (meth)acrylamide, and adducts of glycidyl (meth)acrylate with amines; Monoesters of (meth)acrylic acid with dihydric alcohols having 2 to 8 carbon atoms, such as 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, and 4-hydroxybutyl (meth)acrylate; ε-caprolactone modified forms of monoesters of (meth)acrylic acid with dihydric alcohols having 2 to 8 carbon atoms; N-hydroxymethyl (meth)acrylamide; allyl alcohol; and hydroxyl group-containing polymerizable unsaturated monomers such as (meth)acrylates having polyoxyethylene chains with hydroxyl groups at the molecular ends; Epoxy group-containing polymerizable unsaturated monomers such as glycidyl (meth)acrylate, β-methylglycidyl (meth)acrylate, 3,4-epoxycyclohexylmethyl (meth)acrylate, 3,4-epoxycyclohexylethyl (meth)acrylate, 3,4-epoxycyclohexylpropyl (meth)acrylate, and allyl glycidyl ether; (Meth)acrylates having polyoxyethylene chains with alkoxy groups at their molecular ends; Sulfonic acid group-containing polymerizable unsaturated monomers such as 2-acrylamido-2-methylpropanesulfonic acid, allylsulfonic acid, sodium styrenesulfonate, sulfoethyl methacrylate, and their sodium or ammonium salts; Phosphate-containing polymerizable unsaturated monomers such as 2-acryloyloxyethyl acid phosphate, 2-methacryloyloxyethyl acid phosphate, 2-acryloyloxypropyl acid phosphate, and 2-methacryloyloxypropyl acid phosphate; Acrolein, diacetone acrylamide, diacetone methacrylamide, acetoacetoxyethyl methacrylate, formyl styrene, and carbonyl group-containing polymerizable unsaturated monomers such as vinyl alkyl ketones having 4 to 7 carbon atoms (e.g., vinyl methyl ketone, vinyl ethyl ketone, vinyl butyl ketone); These include combinations thereof.

[0022] In the present invention, it is preferable that the aqueous resin (B1) contains carbonyl groups. By including carbonyl groups in the aqueous resin (B1), particularly when the aqueous resin (B2) contained in the topcoat paint (II) described later also contains carbonyl groups, a multi-layer coating with excellent water resistance can be formed on the outer surface of the concrete foundation of a house.

[0023] When introducing carbonyl groups into aqueous resin (B1), the amount of carbonyl group-containing polymerizable unsaturated monomer used is preferably in the range of 5 to 35% by mass, particularly 10 to 30% by mass, of the total polymerizable unsaturated monomers used in the production of aqueous resin (B1).

[0024] Furthermore, from the viewpoint of crack resistance of the multilayer coating film formed on the outer surface of the concrete foundation of a house by the method of the present invention, it is preferable that the glass transition temperature of the water-based resin (B1) is 25°C or lower, and particularly within the range of -30 to 15°C. In the present invention, the glass transition temperature of the resin when the resin is an acrylic resin is calculated as follows.

[0025] 1 / Tg(K) = W1 / T1 + W2 / T2 + ...W n / T n Tg(°C) = Tg(K) - 273 In the formula, W1, W2,...W nThese are the mass fractions of each monomer, T1, T2...T n This is the glass transition temperature Tg(K) of the homopolymer of each monomer. The glass transition temperatures of homopolymers of each monomer are those given on pages III-139 to 179 of the Polymer Hand Book (Second Edition, edited by J. Brandup and E. Himmergut). If the Tg of a homopolymer is not clear, the static glass transition temperature obtained when the homopolymer of the monomer is synthesized to have a weight-average molecular weight of approximately 50,000 is used. For resins other than the homopolymer or acrylic resins mentioned above, the static glass transition temperature shall be adopted. The static glass transition temperature can be determined using a differential scanning calorimeter "DSC-220U" (manufactured by Seiko Instruments Corporation). After taking the sample into a measuring cup and completely removing the solvent by vacuum suction, the change in heat quantity is measured in the range of -20°C to +200°C at a heating rate of 3°C / min, and the point of change at the first baseline on the lower temperature side is read.

[0026] Water-based resin (B1) can be obtained by conventional methods, but emulsion polymerization is preferred in terms of water resistance and weather resistance of the multi-layer coating applied to the outer surface of the concrete foundation of a house. In emulsion polymerization, commonly used ionic or nonionic emulsifiers can be used.

[0027] Examples of ionic emulsifiers include alkyldiphenyl ether disulfonates such as diammonium dodecyldiphenyl ether disulfonate, sodium dodecyldiphenyl ether disulfonate, calcium dodecyldiphenyl ether disulfonate, and sodium alkyldiphenyl ether disulfonate; alkylbenzene sulfonates such as sodium dodecylbenzenesulfonate and ammonium dodecylbenzenesulfonate; alkyl sulfate esters such as sodium lauryl sulfate and ammonium lauryl sulfate; aliphatic carboxylates such as sodium fatty acid and potassium oleate; and polyoxyalkylene unit-containing sulfate esters (e.g., sodium polyoxyethylene alkyl ether sulfate, polyoxyethylene alkyl ether sulfate). Examples include polyoxyethylene alkyl ether sulfates such as ammonium; polyoxyethylene alkylphenyl ether sulfates such as sodium polyoxyethylene alkylphenyl ether sulfate and ammonium polyoxyethylene alkylphenyl ether sulfate; polyoxyethylene polycyclic phenyl ether sulfates such as sodium polyoxyethylene polycyclic phenyl ether sulfate and ammonium polyoxyethylene polycyclic phenyl ether sulfate; naphthalene sulfonic acid formalin condensate salts such as sodium naphthalene sulfonic acid formalin condensate; alkyl succinate sulfonates such as sodium dialkyl sulfosuccinate and disodium monoalkyl succinate sulfonate; and combinations thereof.

[0028] Examples of nonionic emulsifiers include polyoxyalkylene unit-containing ether compounds (e.g., polyoxyalkylene alkyl ether compounds such as polyoxyethylene lauryl ether, polyoxyethylene stearyl ether, polyoxyethylene tridecyl ether, and polyoxyethylene oleyl ether; polyoxyalkylene alkylphenyl ether compounds such as polyoxyethylene octylphenyl ether and polyoxyethylene nonylphenyl ether; polyoxyalkylene polycyclic phenyl ether compounds such as polyoxyethylene polycyclic phenyl ether); polyoxyalkylene alkyl ester compounds such as polyoxyethylene monolaurate, polyoxyethylene monostearate, and polyoxyethylene monooleate; polyoxyalkylene alkylamine compounds such as polyoxyethylene alkylamine; sorbitan compounds such as sorbitan monolaurate, sorbitan monostearate, sorbitan trioleate, polyoxyethylene sorbitan monolaurate, and polyoxyethylene sorbitan monooleate; and combinations thereof.

[0029] As the emulsifier described above, a reactive emulsifier containing both a polymerizable unsaturated group and an anionic or nonionic group in its molecule can also be used. The amount of emulsifier used can usually be 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.

[0030] The above-mentioned aqueous resin (B1) is included in the non-volatile content of the primer paint (I) in an amount of 5 to 50% by mass, more preferably 10 to 40% by mass, in terms of non-volatile content.

[0031] Primer paint (I): The primer paint (I) may optionally contain paint additives such as pigments other than the inorganic pigment (A1), water-based resins other than the water-based resin (B1), defoaming agents, crosslinking agents, curing catalysts, pigment dispersants, emulsifiers, film-forming aids, thickeners, neutralizing agents, and preservatives.

[0032] In the present invention, the primer (I) preferably has an elongation rate at break of 100% or more at 23°C, and within the range of 150-400%. By using a primer (I) with an elongation rate at break within the above range, it is possible to prevent cracks from occurring in the topcoat when the present invention is applied to the concrete foundation of a house.

[0033] In this specification, the elongation rate at break of a coating film is defined as the percentage of elongation of a coating film with a thickness of 0.3 mm when pulled at a speed of 20 mm / min until it breaks. The drying conditions for the coating film used 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.

[0034] Application of primer (I): In the painting method of the present invention, when applying the primer paint (I) to the outer surface of the concrete foundation of a house, it can be done using known painting means, such as rollers, air sprayers, airless sprayers, texture guns, all-purpose guns, brushes, trowels, and other painting tools. It is particularly preferable to apply the primer paint (I) using a roller, which is a painting means that minimizes paint scattering to the surroundings.

[0035] The application rate for the primer (I) is typically 100-2000 g / m². 2 Preferably 200-1200 g / m² 2 It is desirable that it be adjusted within the specified range.

[0036] The primer film can usually be dried at room temperature, but forced drying may be used if necessary. The drying time from the application of the primer (I) to the application of the next step, the topcoat (II), is 2 to 168 hours, with 4 to 72 hours being particularly appropriate.

[0037] <Process (2)> In the present invention, step (2) is a step of applying a topcoat paint (II) onto the undercoat film formed in step (1) and drying it to form a topcoat film having a spotted pattern (hereinafter referred to as the spotted topcoat film).

[0038] The topcoat paint (II) is a paint that contains colored paint particles (A2) obtained by granulating colored paint and a water-based resin (B2).

[0039] Colored paint particles (A2): In the present invention, the colored paint particles (A2) are obtained by granulating colored paint. Examples of colored paints used as raw materials for producing colored paint particles (A2) include conventionally known liquid colored paints containing a colorant (a2-1), an aqueous resin (a2-2), water, and additives as needed.

[0040] Examples of colorants (a2-1) include coloring pigments and luminous pigments. Examples of coloring pigments among these include 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 pigments such as yellow iron oxide, titanium yellow, monoazo yellow, condensed azo yellow, azomethine yellow, bismuth vanadate, benzimidazolon, isoindolinone, isoindoline, quinophthalone, benzidine yellow, and permanent yellow; orange pigments such as permanent orange; red pigments such as red iron oxide, naphthol AS-based azo red, anthenslon, anthraquinonyl red, perylene maroon, quinacridone-based red pigment, diketopyrrolopyrrole, watching red, and permanent red; purple pigments such as cobalt purple, quinacridone violet, and dioxazine violet; blue pigments such as cobalt blue, phthalocyanine blue, and suren blue; and green pigments such as phthalocyanine green. Examples of lustrous pigments include metallic pigments such as aluminum powder, bronze powder, copper powder, tin powder, iron phosphide, and zinc powder; and pearlescent pigments such as mica, metal oxide-coated mica powder, and mica-like iron oxide. Coloring pigments and lustrous pigments can be used individually or in combination of two or more types.

[0041] The type and amount of the coloring agent (a2-1) can be adjusted as appropriate depending on the type of coloring agent, and can generally be in the range of 0.01 to 500% by mass, preferably 0.05 to 400% by mass, based on the non-volatile content mass of the aqueous resin (a2-2).

[0042] Furthermore, in the aforementioned colored paint, an extender pigment may be used together with the coloring agent (a2-1). Examples of extender pigments include barita powder, precipitated barium sulfate, barium carbonate, calcium carbonate, gypsum, clay, white carbon, diatomaceous earth, talc, magnesium carbonate, alumina white, gloss white, silica, etc., and can be used individually or in combination of two or more.

[0043] As the aforementioned water-based resin (a2-2), any water-based resin commonly used in the field of water-based paints can be used. Specifically, the resin mentioned above can be used 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 from the viewpoint of water resistance of the multi-layer coating film, it is preferable that they be the same type, and it is preferable that they be acrylic resins, in particular acrylic resins containing carbonyl groups. The water-based resin (a2-2) for producing the colored paint particles (A2) preferably has a non-volatile acid value of 20 mg KOH / g or less, more preferably less than 20 mg KOH / g, and particularly preferably 10 mg KOH / g or less, from the viewpoint of crack resistance on the outer surface of the concrete foundation of a house.

[0044] Examples of the aforementioned additives include gravity adjusters such as balloon particles, defoamers, crosslinking agents, catalysts, pigment dispersants, fragrances, deodorizers, antibacterial agents, neutralizing agents, surfactants, aqueous water repellents, dispersants, preservatives, fungicides, antifreeze agents, ultraviolet absorbers, light stabilizers, film-forming aids, and plasticizers.

[0045] The method for producing the above-mentioned colored paint particles (A2) is not particularly limited, but one method is to bring an aqueous liquid composition containing the above-mentioned colored paint and water-soluble polysaccharides into contact with an aqueous medium containing a metal compound and stir.

[0046] The aforementioned water-soluble polysaccharides are polysaccharides that have the ability to transform into water-insoluble or sparingly soluble gels when in contact with monovalent or polyvalent metal ions in an aqueous medium. Specifically, examples include alginic acid or its alkali metal salts, gellan gum, carrageenan, and combinations thereof.

[0047] The above-mentioned metal compound is a compound that can generate monovalent or polyvalent metal ions that can form water-insoluble or sparingly soluble salts with water-soluble polysaccharides in an aqueous medium. Examples of metal species in the metal compound include Group 2 elements of the periodic table such as magnesium, calcium, strontium, and barium, with calcium being particularly preferred.

[0048] The aforementioned metal compound is not particularly limited as long as it is a compound having the above-mentioned metal species, and examples include metal salts of organic acids such as formic acid, acetic acid, propionic acid, butyric acid, lactic acid, oxalic acid, fumaric acid, succinic acid, phosphoric acid, citric acid, and gluconic acid; metal hydroxides, metal oxides; metal carbonates; and combinations thereof.

[0049] The aforementioned metal compound can be dissolved in an aqueous medium such as water to prepare an aqueous medium containing metal ions. In this case, the metal compound does not need to be completely dissolved in the aqueous medium; it may be partially dissolved.

[0050] In the production of colored paint particles (A2), the stirring speed when bringing the aqueous liquid composition containing the above-mentioned colored paint and water-soluble polysaccharides into contact with the aqueous medium containing the metal compound is appropriately within the range of, for example, 500 to 4000 rpm, preferably 700 to 3000 rpm.

[0051] The size of the colored paint particles (A2) obtained in this way is generally preferably within the range of 0.1 to 20 mm, and more preferably within the range of 0.2 to 10 mm. By having the size of the colored paint particles (A2) within this range, it is possible to give the outer surface of the concrete foundation of the house a high-class appearance with a distinct speckled pattern.

[0052] In this specification, the size of the colored paint particles (A2) shall be determined by randomly selecting 30 colored paint particles (A2) contained in the topcoat paint (II), observing them with an optical microscope, and calculating the average value.

[0053] In the present invention, from the viewpoint of paintability and the texture of the outer surface of the concrete foundation of the house, the non-volatile content of the colored paint particles (A2) is preferably in the range of 5 to 65% by mass, more preferably in the range of 10 to 45% by mass, of the non-volatile content of the topcoat paint (II).

[0054] Water-based resin (B2): In the present invention, the topcoat paint (II) contains a water-based resin (B2) as a binder component that appropriately scatters the colored paint particles (A2) and protects the outer surface of the concrete foundation of the house which is the object to be painted. As the water-based resin (B2), any resin commonly used in the field of water-based paints can be used. Specifically, the resin mentioned above can be used as the water-based resin (B1) contained in the undercoat paint (I).

[0055] In the present invention, the aqueous resin (B2) is preferably an acrylic resin, and more preferably a resin containing a carbonyl group.

[0056] The amount of carbonyl group-containing polymerizable unsaturated monomer used to introduce carbonyl groups into aqueous resin (B2) is preferably in the range of 5 to 35% by mass, particularly 10 to 30% by mass, of the total polymerizable unsaturated monomer used in the production of aqueous resin (B2).

[0057] Furthermore, the aqueous resin (B2) is preferably a core-shell type dispersed particle. Because it is a core-shell type dispersed particle, the multi-layer coating film formed by the coating method of the present invention has excellent alkali resistance, making it suitable for coating alkaline substrates such as concrete foundations for houses.

[0058] In the present invention, when producing core-shell type dispersed particles, for example, one method is to obtain an aqueous copolymer dispersion by emulsion polymerization of a mixture of monomer components that form the core portion using a polymerization initiator in the presence of an emulsifier, then add a mixture of monomer components that form the shell portion to the aqueous dispersion and emulsion polymerization using a polymerization initiator.

[0059] The aforementioned water-based resin (B2) is preferably included in the non-volatile content of the topcoat paint (II) in an amount of 40 to 95% by mass, particularly 55 to 90% by mass.

[0060] Topcoat paint (II): In the present invention, it is preferable that the topcoat paint (II) contains a crosslinking agent in addition to the above-mentioned colored paint particles (A2) and aqueous resin (B2). By including a crosslinking agent in the topcoat paint (II), a multi-layer coating film is obtained that provides both crack resistance and water resistance to the outer surface of the concrete foundation of a house. Preferably, the crosslinking agent is a compound having a functional group that can react with the functional groups of the aqueous resin (B1) contained in the primer (I), the aqueous resin (B2) contained in the topcoat (II), and the aqueous resin (a2-2) used for producing the colored paint particles (A2). For example, if one or more of the aqueous resins (B1), (B2), and (a2-2) have a carbonyl group, it is preferable to use a hydrazide compound as the crosslinking agent. Examples of hydrazide compounds include dihydrazide oxalate, dihydrazide malonate, dihydrazide succinate, dihydrazide glutarate, dihydrazide adipic acid, dihydrazide sebacate, dihydrazide dodecanoate, dihydrazide carbonate, dihydrazide phthalate, dihydrazide terephthalate, dihydrazide isophthalate, dihydrazide pyromellitic acid, dihydrazide maleate, dihydrazide fumarate, dihydrazide itaconic acid, 1,3-bis(hydrazinocarboethyl)-5-isopropylhydantoin, and combinations thereof.

[0061] The above topcoat paint (II) may contain, as needed, extender pigments, matting agents such as resin beads, glossy pigments, and paint additives.

[0062] Examples of extender pigments that can be used in the matting agent include the same substances exemplified as extender pigments in the description of colored paint particles (A2). On the other hand, examples of 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, and polyacrylonitrile resin beads. By including a matting agent in the topcoat paint (II), the exterior surface of the residential foundation concrete can be finished with a unique atmosphere that harmonizes the luxurious feel of the speckled pattern with the depth of the matte finish.

[0063] When the topcoat paint (II) contains a matting agent, it is preferable that the amount of matting agent be adjusted to within the range of 0.5 to 30 parts by mass, particularly 5 to 20 parts by mass, based on 100 parts of non-volatile water-based resin (B2) contained in the topcoat paint (II), from the viewpoint of crack resistance on the outer surface of the concrete foundation of the house.

[0064] Examples of paint additives that may be included in the topcoat paint (II) include neutralizing agents, viscosity modifiers, anti-settling agents, antibacterial agents, curing catalysts, pH adjusters, dispersants, defoaming agents, preservatives, antifungal agents, antifreeze agents, UV absorbers, light stabilizers, film-forming aids, and plasticizers.

[0065] The viscosity of the topcoat paint (II) obtained as described above is preferably 100 KU or more, more preferably in the range of 110 to 150 KU, at 25°C. Having the viscosity of the topcoat paint (II) within this range allows for a less uneven mottled pattern to be obtained, even on surfaces with fine irregularities, such as the outer surface of a residential foundation concrete. The viscosity of the topcoat paint (II) shall be measured in accordance with the Stormer viscometer method, JIS K 5600-2-2.

[0066] Application of topcoat paint (II): The topcoat paint (II) can be applied using known painting methods, such as rollers, air sprayers, airless sprayers, texture guns, all-purpose guns, brushes, and trowels. When the topcoat paint (II) is applied to the outer surface of the concrete foundation of a house using a roller, which is a painting method that applies pressure to the application surface during painting, a mottled pattern is obtained in which individual spots are clearly defined and there is little bias.

[0067] The application rate for topcoat paint (II) is typically 50-1500 g / m² per coat. 2 Preferably 100-1000 g / m² 2 It is desirable that it be adjusted within the specified range.

[0068] The formed topcoat film can usually be dried at room temperature, but forced drying may be permitted if necessary. A drying time of 1 hour or more, especially 2 hours or more, is appropriate.

[0069] In the method of the present invention, a step of applying another coat of topcoat paint after the topcoat paint (II) has been applied and dried may be provided as needed.

[0070] As a topcoat paint for recoating, a paint containing the same colored paint particles and water-based resin as topcoat paint (II) is preferred. Alternatively, a paint with the same composition as topcoat paint (II) may be used for recoating, or a different topcoat paint with a different composition of colored paint particles may be used to enhance the texture of the finished appearance. The present invention includes a method for manufacturing a painted outer surface of a residential foundation concrete using the above painting method, or a method for manufacturing a coating applied to the outer surface of a residential foundation concrete. [Examples]

[0071] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples. In the following examples, "parts" and "%" mean "parts by mass" and "% by mass," respectively.

[0072] Manufacturing of water-based resin (B1) for the production of primer paint (I) Manufacturing Example 1 485 parts of deionized water and 1 part of "Newcol 707SF" (Note 1) were added to a 3-liter four-necked flask, and the mixture was purged with nitrogen and maintained at 85°C. 3% of the pre-emulsion with the following composition and 40 parts of 120 parts of an initiator aqueous solution (a mixture of 3 parts ammonium persulfate and 117 parts deionized water) were added to the flask. After stirring for 20 minutes, the remaining pre-emulsion and initiator aqueous solution were added dropwise to the flask over 4 hours. Pre-emulsion Deionized water 368 parts "Newcall 707SF" (Note 1) 67 copies 150 copies of styrene Methyl methacrylate, 300 copies n-butyl acrylate, 300 copies 2-Ethylhexyl acrylate 200 parts 2-Hydroxyethyl acrylate 15 parts Diacetone acrylamide 20 parts Acrylic acid 15 parts After the dropwise addition was complete, the mixture was stirred at 85°C for another 2 hours, and then cooled to 40-60°C. Next, the pH was adjusted with ammonia water to obtain an aqueous resin (B1-1) with 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 with polyoxyethylene chains, non-volatile content 30%.

[0073] Manufacturing Examples 2-3 In the above 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 composition was as shown in Table 1.

[0074] [Table 1]

[0075] Manufacturing of primer paint (I) Manufacturing Example 4 In a 1-liter stainless steel container, 115 parts of tap water, 200 parts of the aqueous resin (B1-1) synthesized in Production Example 1, 5 parts of "Nopcosanto K" (Note 2), 100 parts of titanium dioxide, and 150 parts of calcium carbonate were added sequentially while stirring, and the mixture was stirred until homogeneous. Then, 12 parts of 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate, 5 parts of "BYK-024" (Note 3), 10 parts of a 10% adipic acid dihydrazide aqueous solution, and 3 parts of "PRIMAL ASE-60" (Note 4) were added, and the mixture was stirred until homogeneous to obtain primer paint (I-1). (Note 2) "Nopcosanto K": Trade name, manufactured by Sannopco, sodium polycarboxylate-based dispersant, non-volatile content 33% (Note 3) "BYK-024": Product name, manufactured by BYK Chemie, silicone-based defoamer, non-volatile content 96% or more (Note 4) "PRIMAL ASE-60": Product name, manufactured by Dow Chemical Company, anionic alkaline swelling thickener, non-volatile content 28%

[0076] Manufacturing examples 5-10 In the above manufacturing example 4, primers (I-2) to (I-7) were obtained in the same manner as in manufacturing example 4, except that the compound composition was as shown in Table 2.

[0077] [Table 2]

[0078] Elongation at break Each primer shown in Table 2 was applied to release paper to a dry film thickness of 0.3 mm and dried for 14 days in an atmosphere of 23°C and 50% RH. After that, the paint film was carefully peeled off the release paper without damaging it, and the paint film was cut into strips 5 mm wide and 20 mm long to obtain test specimens. These test specimens were mounted on a tensile testing machine (product name "Autograph AG2000B" manufactured by Shimadzu Corporation), and a tensile test was performed in an atmosphere of 23°C, with a chuck distance of 40 mm and a tensile speed of 20 mm / min. The elongation at fracture was evaluated.

[0079] Manufacturing of water-based resin (a2-2) for the production of colored paint particles (A2) Manufacturing Example 11 485 parts of deionized water and 1 part of "Newcol 707SF" (Note 1) were added to a 3-liter four-necked flask, and the mixture was purged with nitrogen and maintained at 85°C. 3% of the pre-emulsion with the following composition and 40 parts of 120 parts of an initiator aqueous solution (a mixture of 3 parts ammonium persulfate and 117 parts deionized water) were added to the flask. After stirring for 20 minutes, the remaining pre-emulsion and initiator aqueous solution were added dropwise to the flask over 4 hours. Pre-emulsion Deionized water 368 parts Newcall 707SF (Note 1) 67 copies 150 copies of styrene Methyl methacrylate, 400 copies n-butyl acrylate 200 copies 2-Ethylhexyl acrylate 200 parts 2-Hydroxyethyl acrylate 26 parts Diacetone acrylamide 20 parts Acrylic acid 4 parts After the dropwise addition was complete, the mixture was stirred at 85°C for 2 hours, and then cooled to 40-60°C. Next, the pH was adjusted with ammonia water to obtain an aqueous resin (a-1) in the form of dispersed particles, with a non-volatile content of 50% and a non-volatile acid value of 3.1 mg KOH / g.

[0080] Manufacturing Example 12 485 parts of deionized water and 1 part of "Newcol 707SF" (Note 1) were added to a 3-liter four-necked flask, and the mixture was purged with nitrogen and maintained at 85°C. 3% of the pre-emulsion with the following composition and 40 parts of 120 parts of an initiator aqueous solution (a mixture of 3 parts ammonium persulfate and 117 parts deionized water) were added to the flask. After stirring for 20 minutes, the remaining pre-emulsion and initiator aqueous solution were added dropwise to the flask over 4 hours. Pre-emulsion Deionized water 368 parts Newcall 707SF (Note 1) 67 copies 150 copies of styrene Methyl methacrylate, 400 copies n-butyl acrylate 200 copies 2-Ethylhexyl acrylate 200 parts 2-Hydroxyethyl acrylate 18 parts Diacetone acrylamide 20 parts Acrylic acid 12 parts After the dropwise addition was complete, the mixture was stirred at 85°C for 2 hours, and then cooled to 40-60°C. Next, the pH was adjusted with ammonia water to obtain an aqueous resin (a-2) with a non-volatile content of 50%, a non-volatile acid value of 9.4 mg KOH / g, and in the form of dispersed particles.

[0081] White paste manufacturing Manufacturing Example 13 The following ingredients were sequentially added to a 1-liter stainless steel container, stirred and mixed in a stirrer for 30 minutes, and then filtered and discharged through a 100-mesh nylon cloth to produce a white paste. Water 300 parts Hydroxyethylcellulose 2 parts "SN Deformer 777" (Note 5) 10 copies "DISPER BYK-190" (Note 6) 20 copies Titanium dioxide, 600 copies (Note 5) "SN Deformer 777": Product name, manufactured by Sunopco, defoaming agent (Note 6) "DISPER BYK-190": Product name, manufactured by BYK Chemie, pigment dispersant

[0082] Manufacturing of black paste Manufacturing Example 14 The following ingredients were sequentially added to a 1-liter stainless steel container, stirred and mixed in a stirrer for 30 minutes, and then filtered and discharged through a 100-mesh nylon cloth to produce a black paste. Water 300 parts Hydroxyethylcellulose 2 parts "SN Deformer 777" (Note 5) 10 copies "DISPER BYK-190" (Note 6) 20 copies Carbon Black, 30 units

[0083] Manufacturing of aqueous liquid compositions for producing colored paint particles (A2) Manufacturing Example 15 The following ingredients were sequentially added to a 1-liter stainless steel container and stirred and mixed with a stirrer until uniform, thereby obtaining an aqueous liquid composition (C-1) for colored paint particles. Water-based resin (a-1) 200 copies White paste, 100 copies 10% aqueous solution of dihydrazide adipic acid, 10 parts 2,2,4-Trimethyl-1,3-pentanediol monoisobutyrate 12 parts "BYK-024" (Note 3) 6 copies "Adekanol UH-420" (Note 8) 2 parts 370 parts of 2% sodium alginate aqueous solution

[0084] Manufacturing 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 formulation was as shown in Table 3 below.

[0085] [Table 3]

[0086] (Note 7) Iriodin 103W2: Product name, manufactured by Merck, titanium dioxide coated mica pigment. (Note 8) Adekanol UH420: Trade name, manufactured by Asahi Denka Co., Ltd., polyether urethane modified product, viscosity modifier.

[0087] Production of aqueous medium for producing colored paint particles (A2): Manufacturing Example 20 An aqueous medium was prepared by adding 994 parts of deionized water to a 3-liter stainless steel container, then adding 3 parts of calcium hydroxide and 3 parts of "SN Deformer 777" (Note 5), and stirring for 3 minutes.

[0088] Manufacturing of colored paint particles (A2): Manufacturing Example 21 1000 parts of the aqueous medium obtained in Production Example 20 were attached to a stirrer having a stirring blade with a diameter of 75 mm. While stirring at a rotation speed of 2000 rpm, 450 parts of the aqueous liquid composition for colored paint particles (C-1) obtained in Production Example 15 were gradually added to the container to generate colored paint particles. The liquid in the container was then stirred for another 5 minutes at the same rotation speed, and then filtered using an 80-mesh wire mesh to obtain colored paint particles (A2-1) with a non-volatile content of 20%.

[0089] Manufacturing examples 22-25 In the above-described manufacturing example 21, colored paint particles (A2-2) to (A2-5) were produced in the same manner as in the above-described manufacturing example 21, except that the aqueous liquid composition was as shown in Table 4.

[0090] [Table 4]

[0091] Manufacturing of water-based resin (B2) for topcoat paint (II): Manufacturing Example 26 485 parts of deionized water and 1 part of "Newcol 707SF" (Note 1) were added to a 3-liter four-necked flask, and the mixture was purged with nitrogen and maintained at 85°C. 3% of the pre-emulsion with the following composition and 40 parts of 120 parts of an initiator aqueous solution (a mixture of 3 parts ammonium persulfate and 117 parts deionized water) were added to the flask. After stirring for 20 minutes, the remaining pre-emulsion and initiator aqueous solution were added dropwise to the flask over 4 hours. Pre-emulsion Deionized water 368 parts Newcall 707SF (Note 1) 67 copies Methyl methacrylate 550 units n-butyl acrylate 200 copies 2-Ethylhexyl acrylate 200 parts 2-Hydroxyethyl acrylate 36 parts Diacetone acrylamide 10 parts Acrylic acid 4 parts After the dropwise addition was complete, the mixture was stirred at 85°C for another 2 hours, and then cooled to 40-60°C. Next, the pH was adjusted with ammonia water to obtain an aqueous resin (B2-1) with a non-volatile content of 50% and in the form of dispersed particles.

[0092] Manufacturing example 27 485 parts of deionized water and 1 part of "Newcol 707SF" (Note 1) were added to a 3-liter four-necked flask, and the mixture was purged with nitrogen and maintained at 85°C. 3% of the pre-emulsion (for the core) with the following composition, and 40 parts of 120 parts of an initiator aqueous solution (a mixture of 3 parts ammonium persulfate and 117 parts deionized water) were added to the flask. After stirring for 20 minutes, the remaining pre-emulsion (for the core) and initiator aqueous solution were added dropwise to the flask over 3 hours.

[0093] <Pre-emulsion composition (for core)> Deionized water (300 copies) Methyl methacrylate 350 units n-butyl acrylate 230 parts 2-Ethylhexyl acrylate 100 parts 2-Hydroxyethyl acrylate 13 parts Vinyltriethoxysilane 6 parts Acrylic acid (part) "Newcall 707SF" (Note 1) 46 copies After the dropwise addition was complete, the mixture was further aged at 85°C for 2 hours, and then a pre-emulsion (for the shell) made by emulsifying the components with the following composition and 25% of the above ammonium persulfate aqueous solution were added dropwise over 2 hours.

[0094] <Pre-emulsion composition (for shells)> Deionized water, 200 copies Methyl methacrylate, 200 copies n-butyl acrylate 41 parts 2-Ethylhexyl acrylate 15 parts Diacetone acrylamide 15 parts Hydroxyethyl acrylate 6 parts Vinyltriethoxysilane, Part 2 Acrylic acid 4 parts "Newcall 707SF" (Note 1) 20 copies After the dropwise addition was complete, the mixture was kept at 85°C for another 2 hours, and then cooled to 40-60°C. Next, the pH was adjusted with aqueous ammonia to obtain a core-shell emulsion (B2-2) with a non-volatile content of 50% and in the form of dispersed particles.

[0095] Manufacturing of water-based clear paint for topcoat paint (II) Manufacturing examples 28-30 Water-based clear paints (D-1) to (D-3), which serve as binder components for topcoat paint (II), were manufactured using the formulations shown in Table 5 below.

[0096] [Table 5]

[0097] (Note 9) Silicea 350: Product name, manufactured by Fuji Silicea Co., Ltd., silica

[0098] Manufacturing of topcoat paint (II): Manufacturing Example 31 200 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) were placed in a container. While stirring, 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) were added and stirred until the mixture was uniform to produce topcoat paint (II-1).

[0099] [Table 6]

[0100] Manufacturing examples 32-37 In the above manufacturing example 31, topcoat paints (II-2) to (II-7) were manufactured in the same manner, except that the compound composition was as shown in Table 6.

[0101] coating Example 1 On the outer surface of the base concrete formed by placing concrete and removing the formwork, primer paint (I-1) was applied at a coating amount of 600 g / m 2 using a porous roller so that the amount became 600 g / m, and it was dried for 24 hours in an atmosphere of 23°C and 50% RH. Then, on the primer coating film, topcoat paint (II-1) was applied at a coating amount of 400 g / m 2 using a porous roller so that the amount became 400 g / m, and the porous roller was moved 10 times at the same location to check the degree of flattening of the spots, and it was dried for 7 days in an atmosphere of 23°C and 50% RH to prepare a test piece.

[0102] Examples 2 to 7, 10 to 13 and Comparative Examples 1 to 3 In Example 1 above, test pieces were prepared in the same manner as in Example 1 except that the paints used were as described in Table 7 below. Comparative Example 3 is an example where the primer paint (I) is not applied.

[0103] Example 8 Example 8 is an example where, in order to confirm the repairability of the topcoat paint (II), after applying and drying the topcoat paint (II-1), recoating of the same topcoat paint (II-1) was performed. On the outer surface of the base concrete formed by placing concrete and removing the formwork, primer paint (I-1) was applied at a coating amount of 600 g / m 2 using a porous roller so that the amount became 600 g / m, and it was dried for 24 hours in an atmosphere of 23°C and 50% RH. Then, on the primer coating film, topcoat paint (II-1) was applied at a coating amount of 400 g / m by moving the porous roller 10 times so that the amount became 400 g / m 2 and it was overcoated, and it was dried for 7 days in an atmosphere of 23°C and 50% RH. Then, on the topcoat film, topcoat paint (II-1) was applied at a coating amount of 400 g / m by moving the porous roller 10 times so that the amount became 400 g / m 2 and it was overcoated, and it was dried for 7 days in an atmosphere of 23°C and 50% RH to obtain a test piece.

[0104] Example 9 Example 9 is an example where, in addition to enhancing the repairability of the topcoat paint (II), in order to enhance the sense of thickness, after applying and drying the topcoat paint (II-1), another topcoat paint (II-5) was overcoated. In Example 8 described above, a test specimen was obtained in the same manner as in Example 8, except that topcoat paint (II-5) was used instead of topcoat paint (II-1) to be applied over the previous coat.

[0105] Evaluation Test The test specimens obtained as described above were subjected to finish quality tests. Furthermore, for water resistance, alkali resistance, crack resistance, and weather resistance tests, test panels were prepared using flexible board (fiber-reinforced cement board), a material similar to concrete, as the base material, and evaluated according to the following criteria. The results are shown in Table 7.

[0106] (*1) Finish quality The appearance of the test specimens (distribution and degree of crushing of spots) was visually evaluated. ◎: The spotted pattern is clearly defined, without any unevenness caused by minute irregularities. ○: There is a slight unevenness in the spotted pattern in the recessed areas, but the spotted pattern is clearly defined. △: The spotted pattern is noticeably concentrated in the recessed areas and is somewhat indistinct. ×: The spotted pattern is indistinct and monotonous. (*2)Water resistance Apply each of the primers shown in Table 2 to the surface of the flexible board at a rate of 600g / m². 2 The surface was painted using a porous roller and dried for 24 hours in an atmosphere of 23°C and 50% RH. After that, each topcoat paint shown in Table 6 was applied at a rate of 400 g / m². 2 A porous roller was used to apply multiple coats to the primer film, and the test panels were dried for 7 days in an atmosphere of 23°C and 50% RH to prepare the test panels. The appearance of these test panels was visually evaluated according to the following criteria after being immersed in tap water at 23°C for 96 hours. ◎: No blistering or peeling, and no whitening of the paint film was observed. ○: Slight whitening of the paint film is observed, but there is no blistering or peeling. △: Blistering, peeling, and whitening of the paint film are observed in some areas. ×: Blisters, peeling, and whitening of the paint film are observed across the entire surface. (*3) Alkali resistance Apply each of the primers shown in Table 2 to the surface of the flexible board at a rate of 600g / m².2 The surface was painted using a porous roller and dried for 24 hours in an atmosphere of 23°C and 50% RH. After that, each topcoat paint shown in Table 6 was applied at a rate of 400 g / m². 2 The test panels were prepared by applying a porous roller over the primer film and drying them for 7 days in an atmosphere of 23°C and 50% RH. The appearance of these test panels was visually evaluated according to the following criteria after being immersed in a saturated calcium hydroxide aqueous solution at 23°C for 48 hours. ◎: No blistering or peeling, and no whitening of the paint film was observed. ○: Slight whitening of the paint film is observed, but there is no blistering or peeling. △: Blistering, peeling, and whitening of the paint film are observed in some areas. ×: Blisters, peeling, and whitening of the paint film are observed across the entire surface. (*4) Crack resistance A groove 1 mm wide and 3 mm deep was made in the center of the back surface of a flexible plate. Each primer shown in Table 2 was applied to the surface of the plate to a dry film thickness of 0.5 mm, and it was dried for 24 hours in an atmosphere of 23°C and 50% RH. Then, each topcoat shown in Table 6 was applied to a dry film thickness of 0.1 mm, and it was dried for 14 days in an atmosphere of 23°C and 50% RH. After that, the groove in the center of the back surface of the flexible plate was pressed with a finger without damaging the coating, and only the flexible plate was broken to serve as the test specimen. This test specimen was mounted on a tensile testing machine (product name, "Autograph AG2000B," manufactured by Shimadzu Corporation), and a tensile test was performed at a 23°C atmosphere and a tensile speed of 1 mm / min, and the elongation length was evaluated. ◎: 2.0mm or larger. ○: Less than 1.0 to 2.0 mm. △: Less than 0.5 to 1.0 mm. ×: Less than 0.5. (*5) Accelerated weather resistance Apply each of the primers shown in Table 2 to the surface of the flexible board at a rate of 600g / m². 2 The surface was painted using a porous roller and dried for 24 hours in an atmosphere of 23°C and 50% RH. After that, each topcoat paint shown in Table 6 was applied at a rate of 400 g / m². 2The paint was applied over the primer using a porous roller, and dried for 7 days in an atmosphere of 23°C and 50% RH to prepare test panels. Subsequently, the obtained test panels were subjected to a 2000-hour test in accordance with JIS K 5600-7-7 (xenon lamp method), and the appearance of the coating after the test was visually evaluated according to the following criteria. ◎: No loss of gloss, blistering, peeling, or cracking observed. ○: There is a slight loss of gloss, but there are no blisters, peeling, or cracks. △: At least one of the following is observed: loss of gloss or blistering, peeling, or cracking. ×: Significant loss of gloss or at least one of the following is observed across the entire surface of the paint film: blistering, peeling, or cracking.

[0107] [Table 7]

Claims

1. Step (1) involves applying an undercoat paint (I) containing an inorganic pigment (A1) and a water-based resin (B1) to the outer surface of the concrete foundation of a house, and drying it to form an undercoat film, and The process includes step (2) of applying a topcoat paint (II) containing colored paint particles (A2) formed by granulating colored paint and a water-based resin (B2) onto the undercoat film obtained in step (1), and drying it to form a topcoat film with a spotted pattern. The amount of inorganic pigment (A1) contained in the undercoat paint (I) is 100 parts by mass or more per 100 parts by mass of the non-volatile content of the water-based resin (B1), and the elongation at break of the coating film formed by the undercoat paint (I) at 23°C is 100% or more. The aqueous resin (B2) is a core-shell type dispersed particle, and the aqueous resin (B2) contains a carbonyl group, and the carbonyl group is introduced by at least one selected from the group consisting of acrolein, diacetone acrylamide, diacetone methacrylamide, acetoacetoxyethyl methacrylate, formyl styrene, and vinyl alkyl ketones having 4 to 7 carbon atoms. The topcoat paint (II) contains a hydrazide compound as a crosslinking agent. Painting method for the exterior surface of concrete foundations of houses.

2. The coating method according to claim 1, wherein the aqueous resin (B1) is an acrylic resin and is obtained by emulsion polymerization.

3. The coating method according to claim 1 or 2, wherein the aqueous resin (B1) contains a carbonyl group, and the carbonyl group is introduced by at least one selected from the group consisting of acrolein, diacetone acrylamide, diacetone methacrylamide, acetoacetoxyethyl methacrylate, formyl styrene, and vinyl alkyl ketones having 4 to 7 carbon atoms.

4. The coating method according to any one of claims 1 to 3, wherein the glass transition temperature of the water-based resin (B1) is 25°C or lower.

5. A painting method according to any one of claims 1 to 4, wherein a primer paint (I) is applied using a roller.

6. The painting method according to any one of claims 1 to 5, wherein the colored paint particles (A2) contained in the topcoat paint (II) are obtained by contacting an aqueous liquid composition containing a colorant (a2-1), an aqueous resin (a2-2), and water, as well as a water-soluble polysaccharide, with an aqueous medium containing a metal compound and stirring.

7. The coating method according to claim 6, wherein the non-volatile acid value of the aqueous resin (a2-2) is 20 mg KOH / g or less.

8. The painting 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.

9. The painting method according to any one of claims 1 to 8, wherein the viscosity of the topcoat paint (II) is 100 KU or more at 25°C.

10. A painting method according to any one of claims 1 to 9, wherein a topcoat paint (II) is applied using a roller.

11. The painting method according to any one of claims 1 to 10, wherein a topcoat paint is applied on top of the topcoat film formed in step (2).

12. Step (1) involves applying an undercoat paint (I) containing an inorganic pigment (A1) and a water-based resin (B1) to the outer surface of the concrete foundation of a house, and drying it to form an undercoat film, and The process includes step (2) of applying a topcoat paint (II) containing colored paint particles (A2) formed by granulating colored paint and a water-based resin (B2) onto the undercoat film obtained in step (1), and drying it to form a topcoat film with a spotted pattern. The amount of inorganic pigment (A1) contained in the undercoat paint (I) is 100 parts by mass or more per 100 parts by mass of the non-volatile content of the water-based resin (B1), and the elongation at break of the coating film formed by the undercoat paint (I) at 23°C is 100% or more. The aqueous resin (B2) is a core-shell type dispersed particle, and the aqueous resin (B2) contains a carbonyl group, and the carbonyl group is introduced by at least one selected from the group consisting of acrolein, diacetone acrylamide, diacetone methacrylamide, acetoacetoxyethyl methacrylate, formyl styrene, and vinyl alkyl ketones having 4 to 7 carbon atoms. The topcoat paint (II) contains a hydrazide compound as a crosslinking agent. A method for manufacturing the painted exterior surface of residential foundation concrete.

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