JP2018127535A - Aqueous coating material composition imparting designability to outer wall - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an aqueous coating material composition which is a one-liquid type, and keeps hydrophilic property of a coated material surface even with a coated film thickness of 0.5-6.5 mm and keeps the hydrophilic property over a long period of time, and as a result, has less adhesion of dirt on the coated material surface and imparts designability to an outer wall.SOLUTION: An aqueous coating material composition imparting designability to an outer wall contains an acrylic resin-based emulsion, a photopolymerization initiator, an ultraviolet absorber eutectic with the photopolymerization initiator, a surface hydrophilic agent, a filler, an aggregate, a pigment, a thickener, and a film-forming auxiliary agent, where the photopolymerization initiator is 1.0-4.0 pts.wt. with respect to 100 pts.wt. of a solid content of the acrylic resin-based emulsion, and the surface hydrophilic agent is 7.5-15.0 pts.wt. with respect to 100 pts.wt. of a solid content of the acrylic resin-based emulsion, and the aqueous coating material is a one-liquid type and is coated to a base with a thickness of 0.5-6.5 mm.SELECTED DRAWING: None

Description

  The present invention is a one-component water-based coating composition that is applied to an outer wall of a building to a thickness of 0.5 to 6.5 mm, and imparts design properties comprising various uneven patterns to the outer wall, Relates to a water-based coating material composition that imparts designability to an outer wall with little adhesion of dirt on the surface of the coating material.

  Conventionally, resin compositions for water-based paints having improved durability such as weather resistance, chemical resistance, and water resistance and improved low contamination have been proposed. The resin composition for water-based paints can react with the coupling agent (b) other than (a) an organic synthetic resin emulsion, (b) a coupling agent, and (c) the organic synthetic resin (a). A resin composition for a low-contamination water-based paint comprising a hydrophilic organic compound having a group (see Patent Document 1).

  In addition, a water-based low-contamination paint composition has been proposed that is used for the protection of building structures and dramatically improves the stain resistance of the coating film. The water-based low-contamination paint composition has specific emulsion particles in which the core layer (1) is a silane compound, acrylic compound, styrene, acrylonitrile compound, methacrylic compound copolymer, and the shell layer (2) is silane. Compound, acrylic compound, styrene, acrylonitrile compound, copolymer core-shell polymer resin emulsion solid content is 10-30 parts by weight with respect to the solid content of the total coating composition The water-based low-contamination coating composition is characterized in that the wetting agent contains 0.5 to 5.0 parts by weight (see Patent Document 2).

  In addition, in paint films made of water-based paints, it can reduce rain streak-like contamination when exposed to the outdoors, and in particular, can prevent contamination immediately after the paint film is formed, has excellent sustainability, and is stored as a paint. A low-staining aqueous coating composition with good stability and its coating have been proposed. The low-fouling aqueous coating composition and its coating emulsify 1 to 300 parts by mass of (A) an aqueous resin composition and (B) water-dispersed inorganic particles (solid content) having an average particle size of 4 to 100 nm. A low-fouling aqueous coating composition comprising an aqueous dispersion obtained by emulsion polymerization of 100 parts by mass of one or more α, β-ethylenically unsaturated monomers as a stabilizer. It has a function of hydrophilizing the surface of the coating film to improve water wettability, and having rainwater permeate the interface between the coating film and the contaminant to wash away the contaminant (see Patent Document 3).

  Also, after applying a primer coating on the old coating on the outer wall of the building to form a primer coating, a hydrophilic antifouling coating is applied on the primer coating, and the coating thickness is A hydrophilic antifouling treatment method has been proposed for the outer wall surface of a building, characterized in that it forms a hydrophilic antifouling coating film having a water contact angle of 50 ° or less on the surface of the coating film of 10 to 40 μm. (See Patent Document 4).

  However, the resin composition for a low-contamination water-based paint according to Patent Document 1 is a structure in which a coupling agent and an organic compound for hydrophilization are reacted for continuous surface hydrophilization, and an expected effect is obtained. Need to be mixed immediately before coating on the object to be coated, and as a result, it does not become a one-pack type, and the coating film thickness of the low-contamination water-based resin composition is about 40 μm. There is a problem that it cannot be applied to a one-pack type aqueous coating material composition that is applied to an outer wall in a thickness of 0.5 to 6.5 mm as in the invention.

  In addition, the water-based low-contamination paint composition according to Patent Document 2 renders rainwater even if the antifouling effect is improved by hydrophilizing the coating film with a wetting agent and simultaneously imparting an antistatic effect to the coating film surface. For example, when the wetting agent is washed away from the surface of the coating film, there is a problem that the stain resistance may be lowered.

  In addition, the low-fouling aqueous coating composition according to Patent Document 3 does not contain a surfactant that reduces the water resistance of the coating film by causing colloidal silica that is water-dispersed inorganic particles to act as an emulsifier. In addition, the surface of the coating film is hydrophilized by the colloidal silica to reduce rain streak-like contamination, but the coating thickness of the composition is only about 6 mil (about 0.15 mm). Similarly to the low-contamination water-based resin composition for water-based paints in Reference 1, it cannot be applied to a one-component water-based coating composition that is applied to the outer wall at a thickness of 0.5 to 6.5 mm as in the present invention. There are challenges.

  Moreover, the hydrophilic antifouling paint described in the hydrophilic antifouling treatment method for a building outer wall surface according to Patent Document 4 has a coating thickness of 10 to 40 μm, as in the compositions of Patent Document 1 and Patent Document 3. Since it is a thin film, there is a problem that it cannot be applied to a one-component aqueous coating composition that is applied to the outer wall in a thickness of 0.5 to 6.5 mm as in the present invention.

Japanese Patent Laid-Open No. 2001-72928 JP 2004-161894 A JP 2008-239779 A JP2012-210605A

  An object of the present invention is a one-pack type, and even if the coating film thickness is 0.5 to 6.5 mm, the coating material surface is kept hydrophilic and the hydrophilicity is maintained for a long time. As a result, an object of the present invention is to provide a water-based coating material composition that imparts a design property to the outer wall with less contamination on the surface of the coating material.

  The present inventors have intensively studied the above problems, and the invention according to claim 1 includes an acrylic resin emulsion, a photopolymerization initiator, an ultraviolet absorber eutectic with the photopolymerization initiator, and surface hydrophilization. Agent, filler, aggregate, pigment, thickener, and film-forming aid, and the photopolymerization initiator is 1.0 to 100 parts by weight with respect to 100 parts by weight of the solid content of the acrylic resin emulsion. 4.0 parts by weight, and the surface hydrophilizing agent is 7.5 to 15.0 parts by weight with respect to 100 parts by weight of the solid content of the acrylic resin emulsion. Provided is a water-based coating material composition that imparts designability to an outer wall characterized by being applied to a thickness of 5 mm.

The invention according to claim 2 provides the aqueous coating material composition for imparting designability to the outer wall according to claim 1, wherein the surface hydrophilizing agent is a urethane-modified polyether compound having a molecular weight of 10,000 or less. .

  The invention according to claim 3 is characterized in that the photopolymerization initiator and the ultraviolet absorber are made of a eutectic mixture, and the water-based coating material composition imparting designability to the outer wall according to claim 1 or claim 2 Offer things.

  According to a fourth aspect of the present invention, there is provided an aqueous coating material composition for imparting design properties to the outer wall according to any one of the first to third aspects, wherein the ultraviolet absorber is benzophenone.

  In the invention described in claim 5, the photopolymerization initiator is 1-hydroxy-cyclohexyl-phenyl ketone. The aqueous system imparting design properties to the outer wall according to any one of claims 1 to 4 A coating material composition is provided.

  The invention according to claim 6 provides an aqueous coating material composition that imparts designability to the outer wall according to any one of claims 1 to 5, wherein the aggregate is cinnabar.

  The aqueous coating material composition that imparts designability to the outer wall of the present invention has the effect that the coating material surface is formed hydrophilic even if the coating film thickness is 0.5 to 6.5 mm, and for a long time. Since the hydrophilicity is maintained throughout, there is an effect that there is little adhesion of dirt on the coating material surface as a result.

  Specifically, in the present invention, a surface hydrophilizing agent is blended, and the surface hydrophilizing agent is not combined with other components in the coating material, and therefore has an effect of gradually shifting to the coating material surface. In particular, the effect is exhibited in the process of drying and curing the coating material, and the surface of the coating material is quickly formed hydrophilic.

  If the surface of the coating material is a conventional surface, the surface hydrophilizing agent is washed away by rain water or the like, so the hydrophilicity of the surface of the coating material is reduced, but in the present invention, a photopolymerization initiator is blended together with an ultraviolet absorber, It is inferred that the photopolymerization initiator polymerizes the α, β-ethylenically unsaturated monomer remaining in the acrylic resin emulsion, densifies the surface of the coating material, and prevents the surface hydrophilizing agent from flowing out. .

  Since the photopolymerization initiator is blended together with the ultraviolet absorber, the ultraviolet rays are rapidly absorbed and radicals are released from the photopolymerization initiator by the energy, and the α, β-ethylenically unsaturated monomer is converted into a radical ( Addition) to polymerize. It is speculated that this action may contribute to re-polymerization (restoration) of the acrylic resin that is cut by light energy.

  It is assumed that the surface of the coating material is densified by this action, so that the surface hydrophilizing agent that is not combined with other components is prevented from flowing out due to rainwater, etc., and the hydrophilicity of the coating material surface is maintained over a long period of time. As a result, there is an effect that there is little adhesion of dirt on the surface of the coating material.

  Hereinafter, the present invention will be described in detail.

  An aqueous coating material composition for imparting designability to the outer wall of the present invention comprises an acrylic resin emulsion, a photopolymerization initiator, an ultraviolet absorber eutectic with the photopolymerization initiator, a surface hydrophilizing agent, and a filling agent. Material, aggregate, pigment, thickener, and film-forming aid, and the photopolymerization initiator is 1.0 to 4.0 weight with respect to 100 parts by weight of the solid content of the acrylic resin emulsion. The surface hydrophilizing agent is 7.5 to 15.0 parts by weight with respect to 100 parts by weight of the solid content of the acrylic resin emulsion. It is a water-based coating material composition that imparts design properties to the outer wall, and an antifoaming agent, a dispersing agent, and the like can be blended as necessary.

[Acrylic resin emulsion]
For the acrylic resin emulsion of the present invention, acrylic resin emulsions such as acrylic ester copolymer resins, vinyl acetate / acrylic ester copolymer resins, and silicone-modified acrylic resins can be used. Examples of acrylic monomers used as acrylic resins include methyl acrylate, ethyl acrylate, n-propyl acrylate, isopropyl acrylate, n-butyl acrylate, isobutyl acrylate, sec-butyl acrylate, t-butyl acrylate, hexyl acrylate, and 2-ethylhexyl. Acrylate, octyl acrylate, nonyl acrylate, decyl acrylate, dodecyl acrylate, n-amyl acrylate, isoamyl acrylate, lauryl acrylate, stearyl acrylate, methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, isopropyl ( (Meth) acrylate, n-butyl (meth) acrylate, isobutyl (meth) acrylate, sec-butyl (meth) acrylate , T-butyl (meth) acrylate, hexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, octyl (meth) acrylate, nonyl (meth) acrylate, decyl (meth) acrylate, dodecyl (meth) acrylate, n -Amyl (meth) acrylate, isoamyl (meth) acrylate, lauryl (meth) acrylate, stearyl (meth) acrylate, cyclohexyl (meth) acrylate, phenyl (meth) acrylate, benzyl (meth) acrylate, methoxyethyl (meth) acrylate, Ethoxyethyl (meth) acrylate, methoxypropyl (meth) acrylate, ethoxypropyl (meth) acrylate, and the like can be used. Other unsaturated monomers include styrene derivatives such as styrene, α-methylstyrene, chlorostyrene, vinyltoluene, methoxystyrene; (meth) acrylic acid, fumaric acid, maleic acid, maleic anhydride, itaconic acid, anhydrous Carboxy group-containing monomers such as itaconic acid and crotonic acid; (meth) acrylic acid, crotonic acid, itaconic acid; 2-hydroxyethyl (meth) acrylate, 2 (3) -hydroxypropyl (meth) acrylate, Hydroxyl group-containing monomers such as 4-hydroxybutyl acrylate, allyl alcohol, mono (meth) acrylic acid ester of polyhydric alcohol; Amide group-containing monomers such as (meth) acrylamide and maleamide; 2-aminoethyl ( (Meth) acrylate, dimethylaminoethyl (meth) acrylate, 3-aminopropyl (meth) acrylic Amino group-containing monomers such as silicate, 2-butylaminoethyl (meth) acrylate, vinylpyridine; glycidyl (meth) acrylate, allyl glycidyl ether, epoxy compounds having two or more glycidyl groups and active hydrogen atoms Epoxy group-containing monomers and oligomers obtained by reaction with ethylenically unsaturated monomers having; vinyltrimethoxysilane, vinyltriethoxysilane, vinylmethyldimethoxysilane, vinylmethyldiethoxysilane, 3- (meth) acrylic Loxypropyltrimethoxysilane, 3- (meth) acryloxypropyltriethoxysilane, 2- (meth) acryloxyethyltrimethoxysilane, 2- (meth) acryloxyethyltriethoxysilane, 3- (meth) acryloxypropyl Methyldimethoxysilane, 3- (meth) acryl Xylpropylmethyldiethoxysilane, 3- (meth) acryloxypropylmethyldipropoxysilane, 3- (meth) acryloxybutylphenyldimethoxysilane, 3- (meth) acryloxypropyldimethylmethoxysilane, and 3- (meth) An alkoxysilyl group-containing monomer such as acryloxypropyldiethylmethoxysilane; vinyl acetate, vinyl chloride, ethylene, butadiene, acrylonitrile, dialkyl fumarate, and the like can also be used.

  The glass transition temperature of the resin in the acrylic resin emulsion is preferably -30 to 20 ° C. When the glass transition temperature is less than −30 ° C., the finished surface becomes tacky and easily becomes dirty, and when it exceeds 20 ° C., film formation is poor. The resin solid content in the entire aqueous coating material composition of the present invention is preferably 5.0 to 20.0% by weight, and if it is less than 5.0% by weight, the tackiness and coating workability deteriorate, and 20.0% by weight. If it exceeds%, the viscosity decreases, the coating workability decreases, and the number of designs (patterns) that can be expressed decreases. As a commercially available acrylic resin emulsion, there is Acronal PS743 (manufactured by BASF, solid content 55% by weight).

[Photopolymerization initiator]
The photopolymerization initiator used in the present invention is, for example, an unreacted α, β-ethylenic acid in an acrylic resin emulsion by light after the composition is applied to the outer wall of a building and moisture is volatilized and dried. It is blended for the purpose of densifying the coating material surface by the action of polymerizing an unsaturated monomer. Specifically, α-hydroxyalkylphenone photoradical polymerization initiators are preferable, and 1-hydroxy-cyclohexyl-phenyl ketone is particularly preferable. The blending amount of the photopolymerization initiator is preferably 1.0 to 4.0 parts by weight with respect to 100 parts by weight of the solid content of the acrylic resin emulsion in the present composition. The surface hydrophilizing agent on the surface of the coating material flows out of the surface of the coating material due to rain water, etc., and the coating material is easily soiled. If it exceeds 4.0 parts by weight, the surface hydrophilizing agent on the surface of the coating material becomes excessive and the soiling is attached. It may be easy to do.

[Ultraviolet absorber]
The ultraviolet absorber used in the present invention is preferably a chemical product that is eutectic with the photopolymerization initiator, and specifically, benzophenone can be used. When used, it is preferable to mix it with a photopolymerization initiator and a eutectic mixture. By using a eutectic mixture, the photopolymerization initiator is uniformly dispersed throughout the composition, so that the photopolymerization initiator is effectively dispersed. Works. The ratio of the photopolymerization initiator and the ultraviolet absorber in the eutectic mixture is preferably 30/70 to 70/30, and the blending amount of the ultraviolet absorber is 100% by weight of the solid content of the acrylic resin emulsion in the composition. 1.0-4.0 weight part is preferable with respect to a part. If the amount is less than 1.0 part by weight, activation of the photopolymerization initiator may be insufficient, and if it exceeds 4.0 parts by weight, dirt may easily adhere to the surface of the coating material.

[Surface hydrophilizing agent]
The surface hydrophilizing agent used in the present invention is blended for the purpose of hydrophilizing the coating material surface after the composition is applied to the outer wall of a building and moisture is volatilized and dried. A urethane-modified polyether compound obtained by reacting a polyol and an isocyanate compound is preferred. The urethane-modified polyether compound has a molecular weight of 10,000 or less and is a water-soluble compound. When this composition is applied to the outer wall of a building by blending with the composition of the present invention, the surface of the coating material To make the surface of the coating material hydrophilic. The blending amount of the surface hydrophilizing agent is preferably 7.5 to 15.0 parts by weight with respect to 100 parts by weight of the solid content of the acrylic resin emulsion in the present composition. Insufficient hydrophilization is likely to occur, and if it exceeds 15.0 parts by weight, dirt may easily adhere to the surface of the coating material.

[Filler]
The filler used in the present invention has an average particle diameter D ₅₀ (particle diameter of 50% by weight) of less than 100 μm, and is blended for the purpose of adjusting the viscosity and applicability of the composition. Calcium carbonate, clay, kaolin, talc, precipitated barium sulfate, barium carbonate, cinnabar dust and the like can be used, and heavy calcium carbonate is inexpensive and can reduce the cost burden. The blending amount of the filler is 3 to 20% by weight, preferably 5 to 12% by weight, based on the entire coating composition, and if it is less than 3% by weight, the concealing property such as transparency of the background is insufficient and 20% by weight. If it exceeds%, the viscosity of the coating material becomes high and the coating workability becomes poor. If it is less than 3% by weight, the hiding property may be lowered depending on the color tone, and if it exceeds 12% by weight, the coating workability tends to be lowered at low temperatures such as in winter.

[aggregate]
The filler used in the present invention has an average particle size D ₅₀ (particle size of 50% by weight) of 100 μm or more, and is blended for the purpose of imparting irregularities to the finished surface. If the diameter is 100 μm or more, the particle diameter can be arbitrarily selected. For example, dredged sand, glass, silica, talc, heavy calcium carbonate, etc., commercially available heavy calcium carbonate having an average particle diameter of 200 μm can be used. As K-250 (trade name, manufactured by Asahi Minesue Co., Ltd.). The blending amount of the aggregate (B) is 40 to 65% by weight with respect to the entire composition. If it is less than 40% by weight, the designability (unevenness of the coating material) is insufficient, and if it exceeds 65% by weight, the workability decreases. .

[Pigment]
For pigments, inorganic pigments such as titanium oxide, zinc oxide, carbon black, ferric oxide (valve), lead chromate, yellow lead, yellow iron oxide, etc. can be used. Since it is excellent in whiteness and white, it can be used as a main pigment.

[Thickener]
A thickener is mix | blended for the purpose of a dip coating workability | operativity and the improvement of water retention property, and water-soluble cellulose ether, urethane modified polyether, polycarboxylic acid, etc. can be used. As a water-soluble cellulose ether, there is hi-Metroise 90SH15000 (trade name, manufactured by Shin-Etsu Chemical Co., Ltd.). The blending amount of the thickener is preferably 0.1 to 5.0 parts by weight with respect to 100 parts by weight of the whole composition, and if it is less than 0.1 parts by weight, a sufficient thickening effect cannot be obtained and the uneven pattern of the coating material is present. When it exceeds 5.0 parts by weight, the coating workability is lowered.

[Filming aid]
The film forming aid should be blended for the purpose of promoting the fusion of the polymer particles in the emulsion and forming a uniform film with the polymer. Use ethylene glycol diethyl ether, benzyl alcohol, butyl cellosolve, ester alcohol, etc. I can do it. The blending amount of the film forming aid is preferably 0.5 to 10 parts by weight with respect to 100 parts by weight of the whole composition, and if it is less than 0.5 parts by weight, film formation at a low temperature may be insufficient. In the case of more than the part, dirt may easily adhere to the surface of the coating material.

  In addition to the above-described blending components, an antifoaming agent or a dispersing agent for uniformly dispersing a filler, a pigment, or the like may be blended in order to eliminate bubbles caused by entrainment in the coating material.

  In the construction of the aqueous coating material composition of the present invention, using a roller brush, a pattern roller, a hammer, a spray gun, etc., the construction tool is appropriately selected so as to be the intended design, and suitable for the design. Finish with the applied amount. The proper viscosity of the blended aqueous coating material composition is preferably 300 to 700 Pa · s. To obtain such a viscosity, it can be adjusted by adding an appropriate amount of water.

  Moreover, the coating thickness of the aqueous coating material composition of the present invention is 0.5 mm to 6.5 mm, which is thicker than general paints, and uses the above-mentioned roller brush, pattern roller, hammer, spray gun, etc. The design is given.

Hereinafter, it demonstrates concretely in an Example and a comparative example.

[Production of materials]
According to the composition of Table 1, aqueous coating material compositions of Examples and Comparative Examples 1 to 6 were prepared. In Table 1, the acrylic resin emulsion uses Acronal 7067 (solid content: 47 to 49%, glass transition temperature of resin: 10 ° C., trade name, manufactured by BASF), and the photopolymerization initiator is 1-hydroxy-cyclohexyl- Phenyl ketone was used after the benzophenone was used as the ultraviolet absorber, and the photopolymerization initiator and the ultraviolet absorber were made into a eutectic mixture at 1: 1 (weight ratio). The surface hydrophilizing agent uses urethane-modified polyether compound SN Cleanact (trade name, manufactured by San Nopco) having a molecular weight of 1000 or less, and the filler is cinnabar powder # 300 (average particle size 25 μm, manufactured by Tochu Co., Ltd., product name). The aggregate is Tohoku cinna sand No. 7 (specific gravity 1.5, average particle size 150 μm, manufactured by Tohoku cinna sand Co., Ltd., trade name), and the pigment is titanium oxide R-820 (Ishihara Sangyo Co., Ltd.). , A product name), a thickener is water-soluble cellulose ether hi Metroles 90SH-15000 (manufactured by Shin-Etsu Chemical Co., Ltd., product name), and a film forming aid is Texanol CS-12 (manufactured by Chisso Corporation, product name). )It was used. In addition to this, an antifoaming agent and a dispersing agent were added, and those appropriately selected from commercially available products for aqueous coating materials can be used. These raw materials were uniformly mixed and dispersed to obtain an aqueous coating material composition that imparted design properties to the outer walls of the examples and comparative examples.

  About the aqueous coating material composition of an Example and a comparative example, it evaluated by the evaluation method shown below.

[Evaluation method]

[Contact angle]
Apply 0.2kg / m ² of solvent type chlorinated rubber base coat (JS-410, Aika Kogyo Co., Ltd., trade name) as a sealer on a flexible board (100mm x 150mm x 4mm) defined in JISA5430 The aqueous coating material compositions of Examples and Comparative Examples were applied at 2.0 kg / m ² and dried for 7 days. Using a contact angle meter (Kyowa Interface Science Co., Ltd. Model No .: Drop Master DM-301), 1.0 μL of pure water was dropped onto the coating material surface by the droplet method, and the contact angle after standing for 30 seconds was measured. did. The measurement was performed after drying for 7 days in a 23 ° C. environment, and then immersing the test specimen in water for 24 hours and further drying for 24 hours.

[Accelerated contamination]
Apply 0.2kg / m ² of solvent type chlorinated rubber base coat (JS-410, Aika Kogyo Co., Ltd., trade name) as a sealer on a flexible board (100mm x 150mm x 4mm) defined in JISA5430 The aqueous coating material compositions of Examples and Comparative Examples were applied to a thickness of 0.5 to 6.5 mm and dried for 1 day. Carbon black (12 kinds of JIS test powder carbon black, particle size of about 80 nm: Japan Powder Industry Technical Association) is sprinkled on the entire surface using a tea strainer, and then the specimen is tilted to drop the powder. Carbon black, which can be sprayed by spraying water 10 times on the entire surface with a spray, flowed down. Thereafter, the degree of contamination of the entire test specimen was visually evaluated, and ◯ when there was a slight stain compared with a blank test specimen that was not sprinkled with carbon black, and △ when there was obvious dirt as well. When there was remarkable dirt, it evaluated as x. The test was performed after drying for 1 day in a 23 ° C. environment, and then immersing the test specimen in water for 24 hours and further drying for 24 hours.

[Contamination resistance]
A flexible board (80 x 265 mm, thickness 4 mm) specified by JISA 5430 is used as the base, and a solvent type chlorinated rubber-based undercoat material (JS-410, manufactured by Aika Industry Co., Ltd., trade name) is applied as a sealer at 0.2 kg / m ^2. Then, after drying for 4 hours or more, the aqueous coating material composition of the example or comparative example was applied at a coating amount of 0.9 kg / m ² using a hammer, and the temperature was 23 ° C. and the humidity was 50%. Cured with RH for 12 hours. Thereafter, the same aqueous coating material composition is applied and applied using a hammer so that the coating thickness of the aqueous coating composition is 0.5 to 6.5 mm. A specimen was cured at a humidity of 50% RH for 14 days. Two test bodies were prepared, and one of them was installed in a vertically long shape at an angle of 70 degrees with respect to the horizontal plane. At the position of 300 mm in height from the upper part of the coating surface of the test body, a lower end portion of a corrugated plate (wave width 32 mm, length 500 mm) installed at an angle of 10 degrees with respect to the horizontal plane is disposed. The rainwater flowing down the wave bottom of the corrugated plate dropped on the upper part of the coating film of the test specimen, and the rainwater flowed down to the lower part of the coating film of the test specimen by its own weight. A color difference meter (CM-2600d, manufactured by Konica Minolta Sensing Co., Ltd.) is used to measure the color difference between the paint film portion exposed to the outdoors for three months under these conditions and stained with rainwater and the unexposed test specimen paint film. The color difference was evaluated as stain resistance. A color difference of less than 2.5 was evaluated as ◯, and 2.5 or more as x.

[Creativity]
A 900 mm square flexible board specified by JISA 5430 is installed vertically, and the coating thickness of the aqueous coating material composition of the example or the comparative example is 0.5 to 6.5 mm while making a difference in unevenness with a sword tip. Apply a fan-shaped pattern and let it dry as it is. After hardening, the pattern that was applied was kept as it was, and the case where the pattern collapsed (sagging, leveling) was marked as x.

[Film formability (low temperature cracking)]
A spacer with a thickness of 2 mm and a width of 7 mm is attached to the periphery of a glass plate with a thickness of 150 × 150 mm and a thickness of 2 mm, and the aqueous coating material composition of the example or the comparative example is applied with a spatula so as to have a uniform thickness. Immediately, it was placed horizontally in a 5 ° C. thermostat. After 48 hours, the sample was taken out from the thermostat and visually observed as cracks on the coating film surface, and marked with no cracks.

[water resistant]
Use a 150 x 150 x 4 mm flexible board (JIS A5430 stipulated flexible board), and apply 0.2 kg / m ² of solvent chlorinated rubber base coat (JS-410, trade name, manufactured by Aika Kogyo Co., Ltd.) as a sealer. Then, after drying for 4 hours or more, the aqueous coating material composition of the example or comparative example was applied at a coating amount of 0.9 kg / m ² using a hammer, and the temperature was 23 ° C. and the humidity was 50%. Cured with RH for 12 hours. Thereafter, the same aqueous coating material composition is applied, and applied using a hammer so that the coating thickness of the aqueous coating material composition is 0.5 to 6.5 mm. The specimen was cured at 50% RH for 1 day. After curing, the sample was immersed in water at 23 ° C., and the swelling and softening of the surface after 24 hours were evaluated by visual observation and finger erosion. In the case where there was no swelling or softening, it was marked as ◯, and otherwise it was marked as x.

[Swelling resistance]
A test specimen was prepared by a method based on JIS A 6909. First, 0.2 kg / m ² of a water-based acrylic primer (JS-500, manufactured by Aika Kogyo Co., Ltd., trade name) as a sealer was applied to a 70 × 70 × 20 mm mortar piece and dried for 4 hours or more. Alternatively, the aqueous coating material composition of the comparative example was applied at a coating amount of 0.9 kg / m ² using a hammer and cured at a temperature of 23 ° C. and a humidity of 50% RH for 12 hours. Thereafter, the same aqueous coating material composition is applied and applied using a hammer so that the coating thickness of the aqueous coating composition is 0.5 to 6.5 mm. A specimen was cured at a humidity of 50% RH for 14 days. The test body was subjected to 10 cycles of a hot and cold repeated test at a temperature of 23 ° C. for 18 h and then −20 ° C. for 3 h → 50 ° C. for 3 h, and the presence or absence of swelling of the coating material surface was visually confirmed. In the case where blistering occurred, the mark was rated as x.

[Evaluation results]

  The evaluation results are shown in Table 2.

Claims (6)

  Acrylic resin emulsion, photopolymerization initiator, ultraviolet absorber eutectic with the photopolymerization initiator, surface hydrophilizing agent, filler, aggregate, pigment, thickener, and film formation The photopolymerization initiator is 1.0 to 4.0 parts by weight with respect to 100 parts by weight of the solid content of the acrylic resin emulsion, and the surface hydrophilizing agent is 100 parts by weight of the acrylic resin emulsion. An aqueous coating material that imparts design properties to the outer wall, which is 7.5 to 15.0 parts by weight with respect to parts by weight and is applied to the base in a one-pack type with a thickness of 0.5 to 6.5 mm Composition.   2. The aqueous coating material composition for imparting designability to an outer wall according to claim 1, wherein the surface hydrophilizing agent is a urethane-modified polyether compound having a molecular weight of 10,000 or less.   The aqueous coating material composition for imparting designability to the outer wall according to claim 1 or 2, wherein the photopolymerization initiator and the ultraviolet absorber are a eutectic mixture.   The water-based coating material composition for imparting design properties to the outer wall according to any one of claims 1 to 3, wherein the ultraviolet absorber is benzophenone.   The water-based coating composition for imparting designability to the outer wall according to any one of claims 1 to 4, wherein the photopolymerization initiator is 1-hydroxy-cyclohexyl-phenyl ketone. The water-based coating material composition for imparting design properties to the outer wall according to any one of claims 1 to 5, wherein the aggregate is cinnabar sand.