JP7138054B2 - Coating finishing method - Google Patents

Description

The present invention relates to a coating material finishing method that can be applied to the outer wall of a building to a thickness of 0.7 to 1.5 mm to give an inorganic texture as if cement mortar was applied and finished as it is.

Conventionally, when finishing the outer wall of a building by a mortar finishing method by a plasterer, a cement composition with improved troweling workability that can achieve both good troweling workability and the formation of an excellent mortar-finished surface has been provided ( Patent document 1).

The cement composition contains cement, fine aggregate, a water retention agent and a thickener, the water retention agent is a modified starch obtained by processing natural polysaccharides containing amylose and amylopectin, and the water retention agent is added to 100 parts by mass of cement. is 0.02 to 0.18 parts by mass.

However, since the cement composition contains a large amount of cement, there is a problem that efflorescence may occur on the surface portion when rainwater or the like permeates the finished surface due to rainfall or the like. In addition, since the cement composition is hardened by a hydration reaction with cement, the hardened layer is brittle, and vibrations of the building due to earthquakes, wind pressure, passing vehicles, etc., and the foundation caused by such vibrations. There is a problem that it may not be able to follow cracks, and cracks may occur on the finished surface.

On the other hand, there has been proposed a water-based coating material composition that does not use cement, a method for applying the same, and a wall structure using the same, which does not cause cracks due to changes in the substrate over time (Patent Document 2).

The water-based coating composition comprises a synthetic resin emulsion, clay, silt, sand, and water, and is a water-based coating composition having a JISA6909 moisture absorption/desorption amount of 70 or more when applied at 2.0 kg/m ² , Assuming that the weight excluding volatile matter is 100% by weight, the solid content of the synthetic resin emulsion is 6 to 10.14% by weight, clay and silt is 26 to 35% by weight, and sand is 55 to 65% by weight. is a water-based coating material composition characterized in that it occurs, and the method of applying the water-based coating material composition is a synthetic resin emulsion finish coating material specified in JISA 6909. After forming a coating film having unevenness , is a wall construction method characterized by coating, but there is a problem that the finished state that can be obtained by the water-based coating material composition and its construction method is a mud wall-like texture.

JP 2007-269501 A Japanese Patent No. 5580509

The object of the present invention is to finish the outer wall of a building with a texture similar to that of a mortar finish by plastering, and to prevent efflorescence on the surface even when rainwater or the like permeates the finished surface due to rainfall or the like. To provide a coating material finishing method capable of following vibrations of a building caused by an earthquake, wind pressure, passage of vehicles, etc., and cracks in a substrate caused by the vibrations.

In order to solve the above problems, the invention according to claim 1 applies a sealer to the base if necessary and dries it, and on this, an acrylic resin emulsion, a filler, an aggregate, a pigment, and an extender. A water-based coating material composition comprising a viscosity agent and a film-forming aid, wherein the weight ratio of filler to aggregate is filler:aggregate = 1:2.8 to 15.0,
With a metal trowel made of stainless steel with a thickness of 0.3 mm to 0.7 mm, a trowel wave with a coating amount of 0.6 kg to 1.0 kg per 1 m ² and a wave interval of 70 to 500 mm in the cross-sectional view of the coating film Apply and dry so that is formed continuously,
On top of this, the water-based coating material composition is applied with the metal trowel in an amount of 0.6 kg to 1.0 kg per 1 m ² and a trowel chatter wave with a wave interval of 1 to 10 mm in the cross-sectional view of the coating film. Apply and dry so that is formed continuously,
Acrylic resin-based emulsion, filler, aggregate, pigment, thickener, and film-forming aid are formed thereon, and the weight ratio of the filler to the aggregate is filler:aggregate=1. : A sand wall-like paint composition of 1.3 to 2.7,
After distributing using a roller brush with an application amount of 0.2 kg to 0.4 kg per 1 m ² , with a metal trowel or spatula made of stainless steel with a thickness of 0.3 mm to 0.7 mm, the trowel chatter wave. Squeeze and dry in a direction approximately perpendicular to the direction of travel,
Provided is a method for finishing a coating material, characterized in that the surface of the coating material is finished by polishing with a polishing means having an abrasive particle size of P60 to P150.

According to the second aspect of the invention, the total weight part of the organic matter contained in each of the water-based coating material composition and the sand wall-like coating composition used in the coating material finishing method according to claim 1 is The coating material finishing method according to claim 1, characterized in that it is 7.0 to 8.5% by weight with respect to the total weight part.

The coating material finishing method of the present invention has the effect of forming a fine trowel chatter wave with a wave interval of 1 to 10 mm along a large trowel wave with a wave interval of 70 to 500 mm in the cross-sectional view of the coating film. In addition, by polishing the surface of the coating material with a polishing means having a slightly coarse abrasive particle size, the roughness of the surface finished with the sand wall-like coating composition is eliminated, and a certain amount or more of the resin is added as a binder. As a result, the so-called luster peculiar to resin luster, which is generated by containing as a resin, has disappeared, so the overall finish has an inorganic texture that looks like a conventional cement mortar is applied and finished as it is. have the effect of

In addition, the coating material finishing method of the present invention includes a water-based coating material composition comprising an acrylic resin emulsion, a filler, an aggregate, a pigment, a thickener, and a film formation aid, and an acrylic resin In order to use a sand wall-like paint composition consisting of a system emulsion, a filler, a pigment, a thickener, and a film-forming aid, each composition does not contain cement, so rainfall, etc. Because of this, even if rainwater or the like permeates through the surface of the finished coating film, there is an effect that efflorescence does not occur on the surface of the coating film.

Furthermore, the coating material finishing method of the present invention uses a water-based coating material composition and a sand wall-like coating composition containing an acrylic resin emulsion as a binder. There is an effect that it can follow vibrations caused by earthquakes, wind pressure, passing vehicles, etc., and cracks in the substrate caused by the vibrations.

In addition, for the same reason, there is an effect that the coating film surface is less likely to be contaminated with dust, exhaust gas, and the like.

Furthermore, since each composition used in the coating material finishing method of the present invention contains at least a thickening agent, it has good trowel coating workability when applied to the base, and can be used by skilled craftsmen. Even if it is not, there is an effect that it is possible to easily finish the texture as if cement mortar was applied and finished as it is.

In addition, in the coating film finished by the coating material finishing method of claim 2, the total weight parts of the organic matter contained in each of the water-based coating material composition and the sand wall-like coating composition is equal to the total weight of these compositions Since it is as small as 7.0 to 8.5% by weight with respect to the part, it has the effect of having the non-combustibility required as a finish coating material for interiors.

1 is a plan photograph of a coating film surface (150×210 mm) finished by the coating material finishing method of the present invention (a water-based coating material composition A and the same sand wall-like coating composition in Examples described later).

The present invention will be described in detail below.

In the coating material finishing method of the present invention, if necessary, a sealer is applied to the base and dried, and an acrylic resin emulsion, a filler, an aggregate, a pigment, a thickener, and a film are applied thereon. A water-based coating material composition consisting of an auxiliary agent and having a filler:aggregate weight ratio of filler:aggregate = 1:2.8 to 15.0,
With a metal trowel made of stainless steel with a thickness of 0.3 mm to 0.7 mm, a trowel wave with a coating amount of 0.6 kg to 1.0 kg per 1 m ² and a wave interval of 70 to 500 mm in the cross-sectional view of the coating film Apply and dry so that is formed continuously,
On top of this, the water-based coating material composition is applied with the metal trowel in an amount of 0.6 kg to 1.0 kg per 1 m ² and a trowel chatter wave with a wave interval of 1 to 10 mm in the cross-sectional view of the coating film. Apply and dry so that is formed continuously,
Acrylic resin-based emulsion, filler, aggregate, pigment, thickener, and film-forming aid are formed thereon, and the weight ratio of the filler to the aggregate is filler:aggregate=1. : A sand wall-like paint composition of 1.3 to 2.7,
After distributing using a roller brush with an application amount of 0.2 kg to 0.4 kg per 1 m ² , with a metal trowel or spatula made of stainless steel with a thickness of 0.3 mm to 0.7 mm, the trowel chatter wave. Squeeze and dry in a direction approximately perpendicular to the direction of travel,
A coating material finishing method characterized in that the coating material surface is finished by polishing with a polishing means having an abrasive particle size of P60 to P150. In addition to the components, an antifoaming agent, a dispersing agent, etc. can be blended as needed.

First, the water-based coating material composition and the sand wall-like coating composition used in the coating material finishing method of the present invention will be described.

<Acrylic resin emulsion>
Acrylic resin emulsions constituting the water-based coating material composition and the sand wall-like coating composition used in the present invention include acrylic acid ester copolymer resins, vinyl acetate/acrylic acid ester copolymer resins, silicon-modified acrylic resins, and the like. of acrylic resin-based emulsions can be used. Examples of acrylic monomers for 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, etc. can be used. I can. 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, anhydride; Carboxyl group-containing monomers such as itaconic acid and crotonic acid; (meth)acrylic acid, crotonic acid, itaconic acid; 2-hydroxyethyl (meth)acrylate and 2(3)-hydroxypropyl (meth)acrylate, Hydroxy group-containing monomers such as 4-hydroxybutyl acrylate, allyl alcohol, mono (meth) acrylic acid esters of polyhydric alcohols; (meth) acrylamide and amide group-containing monomers such as maleamide; 2-aminoethyl ( meth) acrylate, dimethylaminoethyl (meth) acrylate, 3-aminopropyl (meth) acrylate, 2-butylaminoethyl (meth) acrylate, amino group-containing monomers such as vinylpyridine; glycidyl (meth) acrylate, Allyl glycidyl ether, epoxy group-containing monomers and oligomers obtained by reacting an epoxy compound having two or more glycidyl groups with an ethylenically unsaturated monomer having an active hydrogen atom; vinyltrimethoxysilane, vinyltriethoxy silane, vinylmethyldimethoxysilane, vinylmethyldiethoxysilane, 3-(meth)acryloxypropyltrimethoxysilane, 3-(meth)acryloxypropyltriethoxysilane, 2-(meth)acryloxyethyltrimethoxysilane, 2 -(meth)acryloxyethyltriethoxysilane, 3-(meth)acryloxypropylmethyldimethoxysilane, 3-(meth)acryloxypropylmethyldiethoxysilane, 3-(meth)acryloxypropylmethyldipropoxysilane, 3 -Alkoxysilyl group-containing monomers such as (meth)acryloxybutylphenyldimethoxysilane, 3-(meth)acryloxypropyldimethylmethoxysilane, and 3-(meth)acryloxypropyldimethylmethoxysilane; in addition, vinyl acetate, Vinyl chloride, as well as ethylene, butadiene, acrylonitrile, dialkyl fumarate, etc. can be used.

The glass transition temperature of the resin in the acrylic resin emulsion is preferably -30 to 40°C. If the glass transition temperature is less than −30° C., the finished surface becomes tacky and easily soiled, and if it exceeds 40° C., poor film formation occurs. The resin solid content in the entire water-based coating material composition or sand wall-like coating composition of the present invention is preferably 5.0 to 20.0% by weight. If it exceeds 20.0% by weight, the viscosity is lowered and the workability of application is lowered. A commercially available acrylic resin emulsion is Acronal PS743 (manufactured by BASF, solid content: 55% by weight).

<Filling material>
The filler constituting the water-based coating material composition and the sand wall-like coating composition used in the present invention has an average particle size D ₅₀ (particle size of 50% accumulated by weight) of less than 100 μm, and the viscosity of the composition It can be used with heavy calcium carbonate, clay, kaolin, talc, precipitated barium sulfate, barium carbonate, silica sand powder, etc. Heavy calcium carbonate is inexpensive and reduces the cost burden. can let The content of the filler in the water-based coating composition is 3 to 20% by weight, preferably 4 to 12% by weight, based on the total composition. If it is insufficient, and if it exceeds 20% by weight, the viscosity of the coating material increases, resulting in poor coating workability. If it is less than 4% by weight, the opacifying property may deteriorate depending on the color tone.

The content of the filler in the sand wall-like coating composition is 10 to 25% by weight, preferably 13 to 21% by weight, based on the total composition. On the other hand, if it exceeds 25% by weight, the viscosity of the coating material becomes high, resulting in poor coating workability. If it is less than 13% by weight, the opacifying property may deteriorate depending on the color tone.

<Aggregate>
The aggregate constituting the water-based coating composition and the sand wall-like coating composition used in the present invention has an average particle size D ₅₀ (particle size of 50% accumulated by weight) of 100 μm or more, and the finished surface has unevenness. However, as long as the average particle size is 100 μm or more, the particle size can be arbitrarily selected. For example, silica sand, glass, silica, talc, heavy calcium carbonate, etc. can be used. is. As a commercially available heavy calcium carbonate having an average particle size of 200 μm, there is K-250 (trade name, manufactured by Asahi Komatsu Co., Ltd.). The blending amount of the aggregate is 40 to 60% by weight based on the total composition in the water-based coating material composition. diminished sexuality.

The amount of aggregate in the sand wall-like coating composition is 20 to 40% by weight of the total composition. decreases.

<Weight ratio of filler and aggregate>
The weight ratio of the filler to the aggregate constituting the water-based coating composition and the sand wall-like coating composition used in the present invention is, in the water-based coating composition, filler:aggregate=1:2.8. When the ratio is less than 1:2.8, the finish of the coating material does not have unevenness, and when it exceeds 15.0, the coating workability becomes insufficient. Similarly, the filler:aggregate weight ratio in the sand wall paint composition is filler:aggregate=1:1.3 to 2.7. On the other hand, if it exceeds 2.7, the concealability is lowered. The difference between "as a coating material" and "as a sand wall ^- like coating material" is defined here. "As a sand wall paint" can be rephrased as when the coating amount is 0.2 kg to 0.4 kg per 1 m ² .

In addition, in the sand wall-like coating composition, the weight ratio of filler to aggregate is preferably filler:aggregate=1:1.3 to 2.7. The combination of the average particle diameters of 1 is a case where the filler has an average particle diameter _D50 of 10 μm and 20 μm, and the aggregate has an average particle diameter _D50 of 200 μm.

<Pigment>
Pigments constituting the water-based coating material composition and the sand wall-like coating composition used in the present invention include titanium oxide, zinc oxide, carbon black, ferric oxide (red oxide), lead chromate, yellow lead, and yellow oxide. Inorganic pigments such as iron can be used. Among them, titanium oxide can be used as a main pigment because it has excellent hiding properties for the base and is white.

<Thickener>
The thickener that constitutes the water-based coating material composition and the sand wall-like coating composition used in the present invention is blended for the purpose of improving troweling workability and water retention, and includes water-soluble cellulose ether, urethane-modified polyether, poly Carboxylic acid and the like can be used. As a water-soluble cellulose ether, there is hi METOLOSE 90SH15000 (manufactured by Shin-Etsu Chemical Co., Ltd., trade name). The blending amount of the thickening agent is preferably 0.1 to 5.0% by weight based on the total composition. , and if it exceeds 5.0% by weight, the coating workability is lowered.

<Film deposition aid>
The film-forming aid that constitutes the water-based coating composition and the sand wall-like coating composition used in the present invention is blended for the purpose of promoting the fusion of polymer particles in the emulsion and forming a uniform polymer film. However, ethylene glycol diethyl ether, benzyl alcohol, butyl cellosolve, ester alcohol, etc. can be used. The amount of the film-forming aid is preferably 0.5 to 10% by weight based on the total composition. Dirt may easily adhere to the surface of the coating material.

The coating material finishing method of the present invention can be applied to bases such as mortar bases, concrete bases, PC panels, ALC panels, ceramic siding bases, etc., and maintains sufficient adhesion, so it is suitable for each base. Apply sealer and let dry. After that, the water-based coating material composition configured as described above is applied with a metal trowel made of stainless steel with a thickness of 0.3 mm to 0.7 mm in an amount of 0.6 kg to 1.0 kg per 1 m ² , And, in the cross-sectional view of the coating film, it is applied so that trowel waves with a wave interval of 70 to 500 mm are continuously formed and dried, and then the same water-based coating material composition is applied to the same iron trowel. Apply and dry so that the coating amount is 0.6 kg to 1.0 kg per 1 m ² and trowel chatter waves are continuously formed with a wave interval of 1 to 10 mm in the cross-sectional view of the coating film. . The trowel chatter wave means that the amount of coating is 0.6 kg to 1.0 kg per 1 m ² , so in actual construction, the trowel is moved with the edge of the trowel standing. This shows the state in which the coating surface becomes uneven due to the vibrating state of the metal trowel.

Next, the sand wall-like coating composition is distributed using a roller brush in an amount of 0.2 kg to 0.4 kg per 1 m ² , and then applied with the same metal trowel or stainless steel with a thickness of 0.3 mm to 0.7 mm. With a spatula, the surface of the coating material is rubbed and dried in a direction substantially perpendicular to the traveling direction of the chatter wave. It is. Here, the polishing means directly refers to the polishing cloth specified in JIS R 6251, the abrasive paper specified in JIS R 6252, the water resistant abrasive paper specified in JIS R 6253, and the abrasive belt specified in JIS R 6256. However, as long as the particle size of the abrasive is from P60 to P150, it can be in any form.

Examples will be described below in detail.

<Preparation of materials>
According to the formulations shown in Table 1, water-based coating compositions and sand wall-like coating compositions of Examples were prepared. In Table 1, the acrylic resin emulsion is Acronal PS743 (solid content: 54 to 56%, glass transition temperature of resin: 30°C, copolymer of styrene, acrylic acid ester, and methacrylic acid ester, manufactured by BASF, trade name). Filler A is silica sand powder #300 (average particle size D ₅₀ 25 μm, manufactured by Tochu Co., Ltd., trade name), and filler B is heavy calcium carbonate BF-200 (average particle size D ₅₀ is 10 μm) ( Bihoku Funka Co., Ltd., trade name), filler C uses heavy calcium carbonate SFT-2000 (Sankyo Flour Milling, trade name) having an average particle diameter _D50 of 20 μm, and aggregate A uses Tohoku Silica Sand 7 No. (specific gravity 1.5, average particle size D ₅₀ 150 μm, manufactured by Tohoku Silica Sand Co., Ltd., trade name), and aggregate B is heavy calcium carbonate K-250 with an average particle size D ₅₀ of 200 μm (manufactured by Asahi Komatsu Co., Ltd. , trade name), titanium oxide R-820 (manufactured by Ishihara Sangyo Co., Ltd., trade name) is used as the pigment, and the thickener is water-soluble cellulose ether hi Metrose 90SH-15000 (manufactured by Shin-Etsu Chemical Co., Ltd., (trade name), and Texanol CS-12 (manufactured by Chisso Corporation, trade name) was used as the film forming aid. In addition, an antifoaming agent and a dispersing agent are added, and these can be appropriately selected from commercially available products for water-based coating materials. These raw materials are uniformly mixed and dispersed to form the water-based coating composition A, the water-based coating composition B and the sand wall-like coating composition of the embodiment, and the water-based coating composition A and the sand wall-like coating composition are used. Example 1 was finished by the process of the coating material finishing method of the present invention, and Example 1 was finished by the process of the coating material finishing method of the present invention using the water-based coating material composition B and the sand wall-like coating composition. 2.

＜評価方法＞

<Evaluation method>

Using the water-based coating material composition A, the water-based coating material composition B, and the sand wall-like coating composition of Examples, according to the steps of the coating material finishing method of the present invention, the substrate was coated and finished, and the evaluation items shown below. was specifically evaluated.

<Designability>
A flexible board (150 × 210 mm, thickness 10 mm) specified by JISA 5430 was used as the base, and a water-based acrylic resin sealer JS-500 (trade name, manufactured by Aica Kogyo Co., Ltd.) with a solid content of 40% by weight was used as the sealer at a rate of 0.075 kg / Apply ^m2 and cure for 12 hours at a temperature of 23°C and a humidity of 50% RH. After drying, the water-based coating material composition A or B in Table 1 is applied with a stainless steel iron trowel having a thickness of 0.5 mm in an amount of 0.8 kg per 1 m ² , and the wave interval is 70 in the cross-sectional view of the coating film. Apply and dry to form a continuous trowel wave of ~500mm. Next, the same water-based coating material composition A or B as the applied material is applied with the same stainless steel iron trowel in an amount of 0.8 kg per 1 m ² , and the wave interval is 1 in the cross-sectional view of the coating film. Apply and dry so that a trowel chatter wave of ~10 mm is continuously formed. Next, the above sand wall-like coating composition was applied by using a roller brush in an amount of 0.3 kg per 1 m ² , and then with the same stainless steel trowel, approximately in the direction of movement of the chatter wave. Squeeze it perpendicularly and let it dry. Finally, the coated material surface was finished by polishing with abrasive paper having a particle size of P80. A sample with an inorganic texture equivalent to that of a cement mortar coating finish was evaluated as ◯, and a sample without such an inorganic texture was evaluated as x.
FIG. 1 shows the state of the surface finished using the water-based coating material composition A.

<Incombustibility>
Water-based acrylic resin sealer JS-500 (product name, AICA Kogyo (product name, AICA Kogyo) 0.075 kg/m ² ) is applied, and cured for 12 hours at a temperature of 23°C and a humidity of 50% RH. After drying, the water-based coating material composition A or B in Table 1 is applied with a stainless steel iron trowel having a thickness of 0.5 mm in an amount of 0.8 kg per 1 m ² , and the wave interval is 70 in the cross-sectional view of the coating film. Apply and dry to form a continuous trowel wave of ~500mm. Next, the same water-based coating material composition A or B as the applied material is applied with the same stainless steel iron trowel in an amount of 0.8 kg per 1 m ² , and the wave interval is 1 in the cross-sectional view of the coating film. Apply and dry so that a trowel chatter wave of ~10 mm is continuously formed. Next, the above sand wall-like coating composition was applied by using a roller brush in an amount of 0.3 kg per 1 m ² , and then with the same stainless steel trowel, approximately in the direction of movement of the chatter wave. Squeeze it perpendicularly and let it dry. Finally, the coated material surface is finished by polishing with abrasive paper having a particle size of P80, and a test plate is obtained. The test plate was subjected to a heat generation test using a cone calorimeter conforming to ISO5660 Part 1. The test time was 20 minutes, the radiation intensity was 50 ^kW / ^{m 2} , and the exhaust flow rate was 24 L/sec. More than 8 MJ/m ² was evaluated as x.

<Zero span tensile elongation>
A flexible board (100×100 mm, 10 mm thick) stipulated in JISA5430 is used as the substrate, and the edges of the two substrates are pressed against each other, and the back surface is temporarily fixed with a curing tape. 0.2 kg/m ² of a solvent-chlorinated rubber undercoat material (JS-410, manufactured by Aica Kogyo Co., Ltd., trade name) is applied as a sealer to the front surface of the base, dried for 4 hours or more. The coating material composition A or B is applied with a stainless steel iron trowel having a thickness of 0.5 mm at a coating amount of 0.8 kg per 1 m ² , and a trowel wave with a wave interval of 70 to 500 mm in the cross-sectional view of the coating film. Apply and dry to form a continuous layer. Next, the same water-based coating material composition A or B as the applied material is applied with the same stainless steel iron trowel in an amount of 0.8 kg per 1 m ² , and the wave interval is 1 in the cross-sectional view of the coating film. Apply and dry so that a trowel chatter wave of ~10 mm is continuously formed. Next, the above sand wall-like coating composition was applied by using a roller brush in an amount of 0.3 kg per 1 m ² , and then with the same stainless steel trowel, approximately in the direction of movement of the chatter wave. Squeeze it perpendicularly and let it dry. Finally, the surface of the coated material was finished by polishing with abrasive paper having a particle size of P80, and cured for 14 days at a temperature of 23° C. and a humidity of 50% RH to obtain a test specimen. After that, peel off the temporary fixing curing tape on the back side, pull both ends of the test piece at 2 mm / min with an Instron universal testing machine, and the distance at which the pinhole occurred at the thrust part is 0.5 mm or more ○, 0.5 mm Less than was evaluated as x.

<Stain resistance>
A flexible board (80 x 265 mm, thickness 4 mm) specified in JISA 5430 is used as the base, and 0.2 kg/m ² of a solvent-based chlorinated rubber undercoat material (JS-410, manufactured by Aica Kogyo Co., Ltd., trade name) is applied as a sealer. Then, after drying for 4 hours or more, the water-based coating material composition A or B in Table 1 is applied with a stainless steel trowel with a thickness of 0.5 mm in an amount of 0.8 kg per 1 m ² and coated. It is applied and dried so that trowel waves with wave intervals of 70 to 500 mm are continuously formed in the cross-sectional view of the film. Next, the same water-based coating material composition A or B as the applied material is applied with the same stainless steel iron trowel in an amount of 0.8 kg per 1 m ² , and the wave interval is 1 in the cross-sectional view of the coating film. Apply and dry so that a trowel chatter wave of ~10 mm is continuously formed. Next, the above sand wall-like coating composition was applied by using a roller brush in an amount of 0.3 kg per 1 m ² , and then with the same stainless steel trowel, approximately in the direction of movement of the chatter wave. Squeeze it perpendicularly and let it dry. Finally, the surface of the coated material was finished by polishing with abrasive paper having a particle size of P80, and cured for 14 days at a temperature of 23° C. and a humidity of 50% RH to obtain a test specimen. Two specimens were prepared, and one of them was installed vertically at an angle of 70 degrees with respect to the horizontal plane. Carbon black (JIS Z 8901, particle size 0.08 μm) 5% by weight, yellow ocher (manufactured by Holbein Industries, PG230 (trade name), particle size 0.3 to 0.6 μm ) 67.5% by weight, 22.5% by weight of Kanto loam (JIS Z 8901, particle size 5 to 10 μm), and 5% by weight of silica sand (JIS Z 8901, particle size 5 to 10 μm). is suspended in 1 liter of tap water, and then 100 ml of tap water is sprinkled in the same manner. This was regarded as one cycle, and 10 cycles were repeated. A color difference meter (CM-2600d, manufactured by Konica Minolta Sensing Co., Ltd.) was used to measure the color difference between the coating film of the test piece that was sprayed with contaminated water and the coating film of another test piece that was not sprayed with contaminated water. The color difference was taken as stain resistance (ΔE). When ΔE was less than 3.0, it was evaluated as ○, and when ΔE was 3.0 or more, it was evaluated as x.

<Evaluation results>

Table 2 shows the evaluation results.

Claims (2)

If necessary, apply a sealer to the base and dry it, and on this, an acrylic resin emulsion, a filler, an aggregate, a pigment, a thickener, and a film formation aid, and a filler. and a water-based coating material composition in which the weight ratio of filler: aggregate = 1: 2.8 to 15.0,
With a metal trowel made of stainless steel with a thickness of 0.3 mm to 0.7 mm, a trowel wave with a coating amount of 0.6 kg to 1.0 kg per 1 m ² and a wave interval of 70 to 500 mm in the cross-sectional view of the coating film Apply and dry so that is formed continuously,
On top of this, the water-based coating material composition is applied with the metal trowel in an amount of 0.6 kg to 1.0 kg per 1 m ² and a trowel chatter wave with a wave interval of 1 to 10 mm in the cross-sectional view of the coating film. Apply and dry so that is formed continuously,
Acrylic resin-based emulsion, filler, aggregate, pigment, thickener, and film-forming aid are formed thereon, and the weight ratio of the filler to the aggregate is filler:aggregate=1. : A sand wall-like paint composition of 1.3 to 2.7,
After distributing using a roller brush with an application amount of 0.2 kg to 0.4 kg per 1 m ² , with a metal trowel or spatula made of stainless steel with a thickness of 0.3 mm to 0.7 mm, the trowel chatter wave. Squeeze and dry in a direction approximately perpendicular to the direction of travel,
A method of finishing a coating material, characterized in that the surface of the coating material is polished by a polishing means having an abrasive particle size of P60 to P150. The total weight parts of the organic matter contained in each of the water-based coating material composition and the sand wall-like coating composition used in the coating material finishing method of claim 1 is 7.0 parts per total weight part of these compositions. The coating material finishing method according to claim 1, wherein the content is 0 to 8.5% by weight.

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