Paint finishing method

Abstract

To provide a paint finishing method that can impart, to a building, a design that causes the exterior wall of the building to look like having deteriorated over time, with good workability and without causing deviation across the entire exterior wall.SOLUTION: According to a paint finishing method of the present invention, water is applied to a base at an application amount of 0.01 to 0.3 kg / m2, a paint is applied to the same using a roller brush with a roller surface thereof being made of natural sponge, at an application amount of 0.01 to 0.3 kg / m2, and before drying of the paint, the paint is washed off by washing-off means using a roller brush with a roller surface thereof being made of sponge or wool, or using a waste cloth.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a paint finishing process. [Background technology]

[0002] In the past, Patent Document 1, which deals with aging paint (painting that gives the appearance of aging), discloses in claim 1 a finishing material in which multiple finishing material compositions are mixed in a container without mixing with each other, characterized in that at least one of the finishing material compositions has a slump value of 29.5 or less, and in claim 5 a painting method comprising the steps of applying a finishing material to a surface to be painted, which is a mixture of multiple finishing material compositions each with a different hue, and causing the multiple finishing material compositions to mix with each other at the contact surface during the painting process, characterized in that the finishing material is a finishing material described in any one of claims 1 to 4. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-169502 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the coating method described in Patent Document 1 has the problem that because it uses a semi-solid finishing material composition with a slump value of 29.5 or less, application can be time-consuming and difficult when applying to large areas such as the exterior walls of buildings. Furthermore, even if multiple finishing materials are mixed together, it can be difficult to impart a design that appears to have deteriorated over time without causing uneven color distribution across the entire exterior wall of a building.

[0005] The problem to be solved by the present invention is to provide a paint finishing method that is easy to apply and can impart a design that looks like it has deteriorated over time without causing unevenness across the entire exterior wall of a building. [Means for solving the problem]

[0006] The present inventors have conducted extensive research to solve the problems of the prior art described above. As a result, they have found that the above problems can be solved by a paint finishing method that uses a wash-off means. Specifically, the present disclosure provides the following means.

[0007] [1] Apply paint to the base using a roller brush with a roller surface made of natural sponge at a rate of 0.01 to 0.3 kg / m 2 This is a paint finishing method in which the paint is applied by a washing means and then washed off before the paint dries. [Effects of the Invention]

[0008] The paint finishing method of the present invention is an improvement over the conventional paint finishing method using a roller, and has the advantage of being easy to work with because it does not require special materials or tools. It also has the advantage of being able to impart a design that looks like it has deteriorated over time without causing uneven application to the entire exterior wall of a building. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a plan photograph of the coating surface (200×260 mm) of Example 1 finished by the paint finishing method of the present invention. [Figure 2] This is a front photograph of a roller brush (approximately 45 mm in diameter and 150 mm in length) used in the paint finishing method of the present invention, whose roller surface is made of natural sponge. DETAILED DESCRIPTION OF THE INVENTION

[0010] The present invention will be described in detail below. In this specification, a numerical range indicated using "to" means that the numerical values ​​before and after "to" are included as the lower limit and upper limit.

[0011] The paint finishing method of the present invention is to apply paint to the base using a roller brush with a roller surface made of natural sponge in an amount of 0.01 to 0.3 kg / m 2 This is a paint finishing method in which the paint is applied by a washing means and then washed off before the paint dries.

[0012] The paint finishing method of the present invention can impart a design that appears aged by applying a paint to a substrate, allowing the paint to penetrate the substrate, and then rinsing it off before it dries. Therefore, any substrate can be used as long as the paint can penetrate the substrate. Examples of suitable substrates include mortar substrates, concrete substrates, precast concrete panel (PC panel) substrates, ceramic siding substrates, painted substrates, plywood substrates, and MDF (medium-density fiberboard). Suitable painted substrates include acrylic resin-based, acrylic urethane resin-based, polyurethane resin-based, fluororesin-based, silicone acrylic resin-based, vinyl acetate resin-based, and epoxy resin-based coatings.

[0013] To ensure sufficient adhesion between the paint and the substrate, a sealer suitable for each substrate can be applied, but if the adhesion to the substrate is sufficient when the paint is applied directly to the substrate, a sealer is not necessary. Examples of usable sealers include JS-800 (a water-based acrylic resin sealer, product name, manufactured by Aica Kogyo Co., Ltd.), JS-410 (a solvent-based chlorinated rubber primer, product name, manufactured by Aica Kogyo Co., Ltd.), and JS-90 (a water-based acrylic resin primer, product name, manufactured by Aica Kogyo Co., Ltd.).

[0014] The roller brush, whose roller surface is made of natural sponge, is a roller brush as shown in Figure 2. It has the pores of various sizes and diameters that are unique to natural sponge, and the surface of the roller brush is highly uneven, with the largest difference in height being about 20 mm. Due to the unevenness caused by this difference in height, the diameter of the roller brush varies from about 20 to 50 mm per roller brush. Therefore, the surface of the roller brush is soft but appears rough at first glance. Using this roller brush allows paint to be applied unevenly, which is one factor that allows the paint to be washed off to create a design that looks like it has been worn over time. A commercially available roller brush with a roller surface made of natural sponge is the AICA Sponge Roller JR-225H (product name, manufactured by AICA Kogyo Co., Ltd.).

[0015] The coating amount of the paint is 0.01 to 0.03 kg / m 2 It is preferable to apply it at a rate of 0.01 kg / m 2 If it is less than 0.03 kg / m, it may not be possible to impart design properties. 2 If the amount exceeds this, sagging may occur, impairing the design. A more preferable application amount is 0.015 to 0.025 kg / m 2 The coating amount is 0.018 to 0.022 kg / m 2 It is more preferable that:

[0016] In addition, before applying the paint, water is applied to the base in an amount of 0.01 to 0.3 kg / m 2 It is preferable to apply the paint at a rate of 0.015 to 0.025 kg / m. This has the effect of delaying the time it takes for the paint to dry, and preventing the paint from drying unintentionally and becoming unable to be washed off. A more preferable application rate is 0.015 to 0.025 kg / m. 2 The coating amount is 0.018 to 0.022 kg / m 2 It is more preferable that:

[0017] The paint used in the paint finishing method of the present invention is a water-based paint that can be applied using a roller brush with a roller surface made of natural sponge and can be washed off the substrate surface using the washing-off means before drying. The viscosity of the paint is preferably 60 to 120 Pa·s, more preferably 70 to 110 Pa·s, and even more preferably 80 to 100 Pa·s. If viscosity increases due to low temperatures, the viscosity may be adjusted to within the above range by adding more than 0 parts by weight and up to 15 parts by weight of water per 100 parts by weight of the water-based paint, as long as the viscosity satisfies the following evaluation test. Examples of water-based paints include Nippe Aqueous Ken Ace (acrylic resin-based paint, product name, manufactured by Nippon Paint Co., Ltd.) and Water-based Fine Coat Fluorine (fluororesin paint, product name, manufactured by Kikusui Chemical Industry Co., Ltd.).

[0018] The acrylic resin paint that can be used as the paint is, for example, a paint composition containing an acrylic resin emulsion, a filler, an aggregate, a pigment, a thickener, and a film-forming aid. The paint composition will be described below.

[0019] <Acrylic resin emulsion> The acrylic resin emulsion may be an acrylic resin emulsion such as an acrylic ester copolymer resin, a vinyl acetate-acrylic ester copolymer resin, or a silicone-modified acrylic resin. Examples of acrylic monomers that can be used to form the acrylic resin include methyl acrylate, ethyl acrylate, n-propyl acrylate, isopropyl acrylate, n-butyl acrylate, isobutyl acrylate, sec-butyl acrylate, t-butyl acrylate, hexyl acrylate, 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, and isobutyl (meth)acrylate. Examples of acrylates that can be used include butyl (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, and ethoxypropyl (meth)acrylate.

[0020] Other unsaturated monomers include styrene derivatives such as styrene, α-methylstyrene, chlorostyrene, vinyltoluene, and methoxystyrene; carboxyl group-containing monomers such as (meth)acrylic acid, fumaric acid, maleic acid, maleic anhydride, itaconic acid, itaconic anhydride, and crotonic acid; (meth)acrylic acid, crotonic acid, and itaconic acid; 2-hydroxyethyl (meth)acrylate, 2(3)-hydroxypropyl (meth)acrylate, 4-hydroxybutyl acrylate, allyl alcohol, and polyhydric Hydroxyl group-containing monomers such as mono(meth)acrylic esters of alcohols; amide group-containing monomers such as (meth)acrylamide and maleinamide; amino group-containing monomers such as 2-aminoethyl (meth)acrylate, dimethylaminoethyl (meth)acrylate, 3-aminopropyl (meth)acrylate, 2-butylaminoethyl (meth)acrylate, and vinylpyridine; glycidyl (meth)acrylate, allyl glycidyl ether, epoxy compounds having two or more glycidyl groups, and compounds having an active hydrogen atom. Epoxy group-containing monomers and oligomers obtained by reacting with ethylenically unsaturated monomers having the same structure; vinyltrimethoxysilane, vinyltriethoxysilane, vinylmethyldimethoxysilane, vinylmethyldiethoxysilane, 3-(meth)acryloxypropyltrimethoxysilane, 3-(meth)acryloxypropyltriethoxysilane, 2-(meth)acryloxyethyltrimethoxysilane, 2-(meth)acryloxyethyltriethoxysilane, 3-(meth)acryloxypropylmethyldimethoxysilane Alkoxysilyl group-containing monomers such as silane, 3-(meth)acryloxypropylmethyldiethoxysilane, 3-(meth)acryloxypropylmethyldipropoxysilane, 3-(meth)acryloxybutylphenyldimethoxysilane, 3-(meth)acryloxypropyldimethylmethoxysilane, and 3-(meth)acryloxypropyldiethylmethoxysilane; and other monomers that can be used include vinyl acetate, vinyl chloride, ethylene, butadiene, acrylonitrile, and dialkyl fumarate.

[0021] The glass transition temperature of the resin in the acrylic resin emulsion is preferably -30 to 40°C. If the glass transition temperature is below -30°C, the finished surface may become tacky and easily soiled, while if it is above 40°C, film formation may be poor. The glass transition temperature here is a value measured by a differential scanning calorimetry (DSC). The resin solids content is preferably 5 to 20 parts by weight per 100 parts by weight of the coating composition. If it is less than 5 parts by weight, adhesion and application workability may decrease, and if it exceeds 20 parts by weight, viscosity may increase and application workability may decrease. A more preferred content is 8 to 18 parts by weight, and even more preferred is 10 to 15 parts by weight. An example of a commercially available acrylic resin emulsion is Acronal YJ6235D (solids content: 55% by weight, product name, BASF).

[0022] <Filling material> The filler has an average particle size D 50 This refers to fillers with a particle size (50% cumulative particle size by weight) of less than 100 μm. They are incorporated to adjust the viscosity and application workability of the paint composition. Heavy calcium carbonate, clay, kaolin, talc, precipitated barium sulfate, barium carbonate, silica sand, etc. can be used. Heavy calcium carbonate is inexpensive and reduces the cost burden. The amount of filler incorporated is preferably 15 to 45 parts by weight, more preferably 25 to 35 parts by weight, per 100 parts by weight of the total paint composition. Less than 15 parts by weight may result in insufficient hiding power, such as the color of the base showing through. More than 45 parts by weight may result in high paint viscosity, resulting in poor application workability. Less than 25 parts by weight may result in reduced hiding power depending on the color tone, while more than 35 parts by weight may result in reduced application workability at low temperatures, such as in winter. An amount of 28 to 32 parts by weight is even more preferable.

[0023] <Aggregate> The aggregate has an average particle size D 50The aggregate refers to aggregates with a cumulative 50% particle size by weight of 100 μm or more, and is blended for the purpose of enabling a thick coating. The particle size of the aggregate can be selected arbitrarily as long as the average particle size is 100 μm or more, and examples of materials that can be used include silica sand, glass, silica, talc, and heavy calcium carbonate. A commercially available heavy calcium carbonate with an average particle size of 200 μm is K-250 (trade name, manufactured by Asahi Komatsu Co., Ltd.). The amount of aggregate blended is preferably 10 to 30 parts by weight per 100 parts by weight of the total paint composition; if it is less than 10 parts by weight, it may not be possible to apply the paint thickly, and if it exceeds 30 parts by weight, workability may decrease. A more preferred amount is 15 to 25 parts by weight, and an even more preferred amount is 18 to 23 parts by weight.

[0024] <Pigments> The pigment may be an inorganic pigment such as titanium oxide, zinc oxide, carbon black, ferric oxide (red iron oxide), lead chromate, lead yellow, yellow iron oxide, etc. Among them, titanium oxide has excellent hiding power for the base and is white, so it can be used as the main pigment.

[0025] <Thickener> The thickener is blended to improve trowel application workability and water retention, and examples of usable thickeners include water-soluble cellulose ethers, urethane-modified polyethers, and polycarboxylic acids. Examples of water-soluble cellulose ethers include hi-metolose 90SH15000 (trade name, manufactured by Shin-Etsu Chemical Co., Ltd.). The amount of thickener blended is preferably 0.1 to 5.0 parts by weight per 100 parts by weight of the total paint composition; if it is less than 0.1 part by weight, a sufficient thickening effect may not be obtained, resulting in an insufficient paint thickness or sagging, while if it exceeds 5.0 parts by weight, application workability may be reduced.

[0026] <Film-forming aid> The film-forming aid is blended to promote the fusion of polymer particles in the emulsion and form a uniform polymer film, and examples of such aids include ethylene glycol diethyl ether, benzyl alcohol, butyl cellosolve, ester alcohol, etc. The amount of film-forming aid blended is preferably 0.5 to 10 parts by weight per 100 parts by weight of the total paint composition; if it is less than 0.5 parts by weight, film formation at low temperatures may be insufficient, and if it exceeds 10 parts by weight, dirt may easily adhere to the surface of the paint.

[0027] In addition to the above, the coating composition may contain antifoaming agents, dispersants, preservatives, anti-algae and anti-fungal agents, anti-freezing agents, etc., as required.

[0028] In this invention, "dry" of a paint refers to a state in which the paint can no longer be washed off using a specified washing-off method. The paint's dryness stages include "touch-dry" (when the fingertip is lightly touched with the painted surface and the fingertip does not become dirty), "semi-hardened" (when the painted surface is gently rubbed with the fingertip and no scratches are left), and "hardened" (when the painted surface is firmly pinched between the thumb and index finger and no fingerprint indentation is left, no movement of the paint film is felt, and when the center of the painted surface is rubbed rapidly and repeatedly with the fingertip, no scratches are left). However, "dry" in this invention refers to "touch-dry," and washing-off methods must be carried out before the paint on the base surface becomes semi-hardened. Washing off the paint from the base surface before it becomes semi-hardened is one factor in creating a design that appears as if the paint has soaked into the base and deteriorated over time.

[0029] The washing-off means refers to a means for washing off the applied paint from the base surface using an application tool containing water or a hydrophilic solvent. Examples of the water that can be used include tap water, distilled water, and ion-exchanged water. Examples of the hydrophilic solvent include ethanol and ethylene glycol. Examples of the application tool include a roller brush with a sponge or wool surface, and a waste cloth. A sponge or wool roller brush is a roller brush made of sponge or wool used for applying paint, with a handle attached. Roller brushes with a sponge or wool surface include cylindrical ones and those with a textured surface, but in the present invention, a cylindrical one without textured surfaces is preferred. The waste cloth can be any material that can be soaked in water to wash off the paint. Examples of such waste cloths include cloths made from recycled clothing or old cloth, and paper tissues and Kimwipes (registered trademark). After soaking these application tools in water or a hydrophilic solvent, a roller brush can be rolled over the entire surface of the base to which the paint has been applied, or a rag can be pressed against the entire surface to which the paint has been applied, thereby rinsing the paint from the base surface. If the water or hydrophilic solvent contained in the application tools becomes scarce during the rinsing process, it is preferable to soak them in water or a hydrophilic solvent as needed. Commercially available application tools include JR-75 (a roller brush with a sponge roller surface, manufactured by Aica Kogyo Co., Ltd., product name), JR-61 (a roller brush with a wool roller surface, manufactured by Aica Kogyo Co., Ltd., product name), and cloth rag (manufactured by SS Sangyo Co., Ltd.). Of course, other application tools can also be used as long as they have the same effect as the roller brush with a sponge or wool roller surface or the rag.

[0030] The paint finishing method of the present invention is a paint finishing method that imparts a design that appears to have deteriorated over time to the exterior walls of buildings, and the resulting design varies depending on the substrate. For example, when the paint finishing method of the present invention is applied to a bare concrete substrate using a white paint, even new concrete will develop efflorescence, resulting in a design that resembles deteriorated concrete over time. Furthermore, when the paint finishing method of the present invention is applied to a reddish-brown resin-based coating substrate using a white paint, a weathered brick-like design will be obtained. Furthermore, when the paint finishing method of the present invention is applied to a black resin-based coating substrate using a brown paint, a rust-like design that resembles aged metal will be obtained.

[0031] According to the present disclosure described above, the following means are provided. [Method 1] Apply paint to the base using a roller brush with a roller surface made of natural sponge at a rate of 0.01 to 0.3 kg / m 2 This is a paint finishing method in which the paint is applied by a washing means and then washed off before the paint dries. [Means 2] Before applying the paint, apply water to the base in an amount of 0.01 to 0.3 kg / m 2 The paint finishing method described in [Means 1] is applied by the following method. [Means 3] A paint finishing method according to [Means 1] or [Means 2], wherein the washing-off means is carried out using a roller brush with a roller surface made of sponge or wool, or a rag.

[0032] The following examples will be described in detail. [Example]

[0033] <Paint finishing method> The paint finishing methods of the examples and comparative examples were evaluated according to the coating method, paint application amount, rinsing timing, and tools used for rinsing shown in Tables 1 and 2. The sponge roller used was the Aica Sponge Roller JR-225H (product name, manufactured by Aica Kogyo Co., Ltd.), the medium-pile roller used was the JR-61 (product name, manufactured by Aica Kogyo Co., Ltd.), the rib roller used was the JR-20 (product name, manufactured by Aica Kogyo Co., Ltd.), the rag used was a cloth rag (manufactured by SS Sangyo Co., Ltd.), the sponge used was the Kaiteki Hyakka Kitchen Sponge Nagamocchi (product name, manufactured by Azuma Kogyo Co., Ltd.), the sponge roller used was the JR-75 (product name, manufactured by Aica Kogyo Co., Ltd.), and the wool roller used was the Marutei Sky (product name, manufactured by Otsuka Brush Manufacturing Co., Ltd.).

[0034] [Table 1]

[0035] [Table 2]

[0036] <Paint> The paint was prepared by mixing 22 parts by weight of Acronal YJ6235D (solid content: 55% by weight, glass transition temperature of resin: 10°C, copolymer of styrene, acrylic acid ester, and methacrylic acid ester, product name, manufactured by BASF) as an acrylic resin emulsion, and silica sand powder #300 (average particle size D 50 5 parts by weight of heavy calcium carbonate BF-200 (average particle size D 50 5 parts by weight of heavy calcium carbonate SFT-2000 (average particle size D 50 15 parts by weight of Tohoku Silica Sand No. 7 (specific gravity: 1.5, average particle size D 50 10 parts by weight of heavy calcium carbonate K-250 (average particle size D: 150 μm, product name, manufactured by Tohoku Silica Co., Ltd.) as aggregate B 50The following was used: 12 parts by weight of titanium dioxide R-820 (manufactured by Ishihara Sangyo Kaisha, Ltd., product name) as a pigment; 5 parts by weight of titanium dioxide R-820 (manufactured by Ishihara Sangyo Kaisha, Ltd., product name); 0.6 parts by weight of water-soluble cellulose ether hi-metolose 90SH-15000 (manufactured by Shin-Etsu Chemical Co., Ltd., product name) as a thickener; 0.5 parts by weight of Texanol CS-12 (manufactured by Chisso Corporation, product name) as a film-forming aid; and appropriate amounts of commercially available antifoaming agent and dispersant for water-based paints, all of which were uniformly mixed and dispersed.

[0037] <Evaluation method> The following evaluations were carried out for the examples and comparative examples. Unless otherwise specified, the preparation of test specimens, curing, and evaluation tests were carried out in an environment of 23°C and 50% RH.

[0038] <Design> A flexible board (900 × 1800 mm, 10 mm thick) conforming to JIS A 5430 was placed against a wall with its lengthwise direction facing upright and fixed in place. A water-based acrylic resin sealer JS-500 (solid content: 40% by mass, product name, manufactured by Aica Kogyo Co., Ltd.) was applied on top of the board at a rate of 0.075 kg / m. 2 and cured for 12 hours. After drying, the above paint was applied using the application method and application amount shown in Tables 1 and 2. Next, the applied paint was washed off using the wash-off timing and tools shown in Tables 1 and 2, and allowed to dry for 7 days. The design on the coating surface was visually observed, and was evaluated as ◯ when the paint was washed off appropriately and the design, which appeared to have deteriorated over time, was evenly applied throughout the entire surface. X when the paint was completely washed off or was not washed off sufficiently and the design, which appeared to have deteriorated over time, was not applied, or when the desired design was applied unevenly and not uniformly throughout the entire surface, was evaluated as x.

[0039] <Workability> In the evaluation of the above <design>, a sample in which no sagging occurred when the paint was applied was rated as ◯, and a sample in which sagging occurred was rated as x.

[0040] <Adhesion> In accordance with JIS A 6909-2003 Architectural Finish Coating Materials 7.9 Adhesion Strength Test, a test specimen was prepared using the same paint finishing method as in the evaluation of "Design" above. The test specimen was then tested according to the standard test procedure to measure the adhesion strength. The adhesion strength was 0.3 N / mm 2 The above are marked with a circle and 0.3N / mm 2 Those with a value of less than this were evaluated as x.

[0041] <Base conformability> The substrate was a flexible board (100 x 100 mm, 10 mm thick) specified in JIS A 5430. Two pieces were butted together with their ends facing each other, and their backs were temporarily secured with masking tape. A solvent-based chlorinated rubber primer, JS-410 (product name, manufactured by Aica Kogyo Co., Ltd.), was applied to the front surface of the substrate as a sealer at a rate of 0.2 kg / m. 2 and allowed to dry for at least 4 hours. The above paint was then applied using the application method and application amount shown in Tables 1 and 2. The applied paint was then washed off using the wash-off timing and tools shown in Tables 1 and 2, and the test specimen was then cured for 14 days to obtain a test specimen. The temporary masking tape on the back was removed, and both ends of the test specimen were pulled at 2 mm / min using a universal testing machine (manufactured by Instron). Test specimens with pinholes at a distance of 0.5 mm or more at the butted area were evaluated as ○, and those with pinholes at a distance of less than 0.5 mm were evaluated as ×.

[0042] <Evaluation results> The evaluation results are shown in Tables 3 and 4.

[0043] [Table 3]

[0044] [Table 4]

Claims

1. The paint is applied to the base with a roller brush whose roller surface is made of natural sponge at a rate of 0.01 to 0.3 kg / m ２ Apply with This paint finishing method involves washing away the paint with a washing means before the paint dries.

2. Before applying the paint, apply water to the base in an amount of 0.01 to 0.3 kg / m ２ 2. The paint finishing method according to claim 1, wherein the paint is applied by the method described above.

3. 3. A paint finishing method according to claim 1, wherein said washing means is a roller brush having a roller surface made of sponge or wool, or a waste cloth.

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