Finishing method for floor underlayment made of plate-like substrate and finishing structure

Abstract

To provide a finishing method for floor underlayment made of a plate-like substrate that can finish even the floor underlayment made of a plate-like substrate into a variety of textures, is free of cracks, and maintains the aesthetic appearance of the time of construction for a long period of time.SOLUTION: Provided is a finishing method for floor underlayment made of a plate-like substrate, including applying a polymer cement composition to a floor underlayment made of a plate-like substrate, laying a glass fiber mesh, applying the same polymer cement composition again and drying, applying and drying an aqueous coating composition, polishing the coating surface, and finishing by applying a top coat composition.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a finishing method and finishing structure for a floor underlayment made of a plate-shaped substrate. [Background technology]

[0002] Previously, in Patent Document 1, the applicant has disclosed a method for finishing concrete floor bases, which comprises applying a primer or surface conditioner to the concrete floor base as needed and allowing it to dry, then applying and drying an aqueous coating composition consisting of an acrylic resin emulsion, filler, aggregate, pigment, thickener, and film-forming aid on top of this, polishing the surface of the dried aqueous coating composition with a polishing means having an abrasive grain size of P60 to P150, and finishing by applying a top coat composition consisting of a base agent containing a silicone-acrylic copolymer resin emulsion with a resin glass transition temperature of 10°C to 50°C and a film-forming aid, and a curing agent containing a silane coupling agent. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2023-027909 Summary of the Invention [Problem to be solved by the invention]

[0004] However, while the concrete floor finishing method described in Patent Document 1 can create a variety of textures, when applied to a floor made of plate-shaped substrates, there is a problem in that if movement occurs at the joints between the plate-shaped substrates that make up the floor, cracks may occur in the finished structure. There is also a problem in that the aesthetic appearance may be marred by these cracks.

[0005] The problem that the present invention aims to solve is to provide a finishing method and finishing structure for floor subfloor made of plate-like substrates that can be finished into a variety of textures, even for floor subfloor made of plate-like substrates, that will not cause cracks in the finished structure if movement occurs at the joints between the plate-like substrates that make up the floor subfloor (it has crack resistance), and that can maintain the aesthetic appearance it had at the time of construction for a long period of time. [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 applying a specific mesh. Specifically, the present disclosure provides the following finishing method and finishing structure for a floor underlayment made of a plate-like substrate.

[0007] [1] A method for finishing a floor underlayment made of a plate-like substrate, comprising: applying a sealer to a floor underlayment made of a plate-like substrate as needed and drying it; applying a polymer cement composition containing an acrylic resin emulsion, a filler, aggregate, a thickener, a film-forming aid, hydraulic cement, and water; laying a glass fiber mesh before the polymer cement composition dries; applying the same polymer cement composition again before drying and drying it; applying and drying an aqueous coating composition containing an acrylic resin emulsion, a filler, aggregate, a pigment, a thickener, and a film-forming aid; polishing the surface of the dried aqueous coating composition with a polishing means having an abrasive grain size of P60 to P150; and finishing by applying a topcoat composition containing a base agent containing a silicone-acrylic copolymer resin emulsion having a resin glass transition temperature of 10 to 50°C and the film-forming aid, and a curing agent containing a silane coupling agent. [2] The method for finishing a floor subfloor made of plate-like substrates according to [1], comprising: prior to applying the sealer, or prior to applying the polymer cement composition if the sealer is not applied, laying a nonwoven fabric across the butt joints between the plate-like substrates that make up the floor subfloor made of plate-like substrates; and applying and drying a moisture-permeable elastic subfloor conditioner on top of the nonwoven fabric. [3] A finishing structure formed by the finishing method for a floor subfloor made of the plate-shaped substrate described in [1] or [2] above. [Effects of the Invention]

[0008] According to the present invention, even floor underlayment made of plate-shaped substrates can be given a variety of textures, and cracks in the finishing structure can be prevented from occurring when movement occurs at the joints between the plate-shaped substrates that make up the floor underlayment, making it possible to maintain the aesthetic appearance that existed at the time of construction. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a plan photograph of the coating surface (300 x 390 mm) of Example 1, which was finished by the method for finishing a floor base made of a plate-shaped substrate of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0010] The present invention will be described in detail below.

[0011] <<Finishing method for floor underlayment made of board-shaped substrate>> First, the finishing method for floor underlayment made of a plate-shaped substrate of the present invention (hereinafter also referred to as "this finishing method") will be described. In this specification, numerical ranges indicated using "to" include the numerical values ​​before and after "to" as the lower and upper limits.

[0012] This finishing method for floor subfloor surfaces is a method for finishing a floor subfloor made of a plate-like substrate, which involves applying a sealer to the subfloor, if necessary, and drying it; applying a polymer cement composition containing an acrylic resin emulsion, filler, aggregate, thickener, film-forming aid, hydraulic cement, and water; laying a glass fiber mesh before the polymer cement composition dries; applying the same polymer cement composition again before drying and drying it; applying and drying an aqueous coating composition containing an acrylic resin emulsion, filler, aggregate, pigment, thickener, and film-forming aid; polishing the surface of the dried aqueous coating composition with a polishing tool using an abrasive with a grit size of P60 to P150; and finishing by applying a topcoat composition consisting of a base agent containing a silicone-acrylic copolymer resin emulsion with a resin glass transition temperature of 10 to 50°C and a film-forming aid, and a curing agent containing a silane coupling agent.

[0013] The substrates that can be used with this finishing method are flooring substructures made of plank-shaped substrates, such as solid wood flooring, composite flooring, floor tiles, cork tiles, or stone slabs. Solid wood flooring is a flooring material made solely of natural wood, without any other wood materials mixed in, so-called solid wood. Composite flooring is a flooring material in which decorative materials such as sawn boards, veneers, or sheets are attached to the surface of a substrate such as plywood. Examples of tree species used to make solid wood flooring and composite flooring include pine, cypress, cedar, paulownia, oak, walnut, and maple. Floor tiles are tile-shaped flooring materials made of synthetic resin, and multiple tiles are joined together to form floor mats. Cork tiles are flooring materials made by compressing the bark of cork oak into planks. Stone slabs are flooring materials made by processing marble, limestone, granite, or other stone into planks.

[0014] The plate-shaped substrate in the present invention may be a substantially rectangular shape with a long side of 300 to 1830 mm and a short side of 300 to 900 mm, a circular shape, or a shape resembling some other shape. Plate-shaped substrates typically have a thickness of 9 to 20 mm, but the target of the present finishing method is not limited to this. If the floor base made of the plate-shaped substrate has unevenness, it can be applied as is if the unevenness is 3 mm or less. If the unevenness exceeds 3 mm, it is preferable to apply an unevenness correction material before applying the present finishing method. Examples of commercially available unevenness correction materials include Crete Bond (product name, manufactured by ABC Shokai Co., Ltd.) and Bond K Mortar (product name, manufactured by Konishi Co., Ltd.).

[0015] To ensure sufficient adhesion, a sealer suitable for each substrate can be applied, but if the polymer cement composition used in the coating finishing method of the present invention is applied directly to the substrate and sufficient adhesion is achieved, 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.).

[0016] The polymer cement composition is a composition containing an acrylic resin emulsion, a filler, an aggregate, a thickener, a film-forming aid, hydraulic cement, and water. In this finishing method, the application amount is 1.0 to 4.0 kg / m. 2 The viscosity is preferably 120 to 440 Pa·s. A trowel or spatula is preferably used as the application tool. The viscosity in this specification is measured using a B-type viscometer TVB10 (trade name, manufactured by Toki Sangyo Co., Ltd.) at 2 rpm using a rotor appropriate for each viscosity.

[0017] The glass fiber mesh (also called glass fiber mesh) is a sheet with a mesh structure formed by arranging multiple glass fibers in a predetermined direction and weaving them into a net (mesh). In this finishing method, it is used for the purpose of achieving crack resistance. The glass fiber mesh can be appropriately selected from those that can achieve this purpose. Depending on the direction in which the glass fibers are arranged, the glass fiber mesh can be biaxial, triaxial, or tetraaxial. In the biaxial orientation, the glass fibers are arranged vertically and horizontally. In the triaxial orientation, the glass fibers are arranged vertically and diagonally to the left and right of the vertical direction. In the tetraaxial orientation, glass fibers are further arranged horizontally in addition to the triaxial orientation. Any of these configurations can be used in this finishing method.

[0018] The glass fiber material constituting the glass fiber mesh includes alkali glass, quartz glass, soda-lime borosilicate glass, etc., but soda-lime borosilicate glass is preferred because it is less susceptible to deterioration and exhibits less loss of strength. The glass fiber thickness is preferably 50 to 500 μm, more preferably 100 to 400 μm, from the viewpoint of crack resistance. The mesh opening size of the glass fiber mesh is preferably 1.5 to 5.0 mm x 1.5 to 5.0 mm, more preferably 2.0 to 4.0 mm x 2.0 to 4.0 mm, from the viewpoint of a balance between compatibility with the polymer cement composition and crack resistance. The thickness of the glass fiber mesh is preferably such that the finished structure formed by this finishing method does not produce irregularities due to the glass fiber mesh; specifically, 0.2 to 1.0 mm is preferred, more preferably 0.35 to 0.75 mm. The weight of the glass fiber mesh is 300 g / m from the viewpoint of workability. 2 Preferably, it is 200 g / m or less. 2It is more preferable that it is less than 1000 N / 50 mm. From the viewpoint of crack resistance, the tensile strength of the glass fiber mesh in the longitudinal direction is preferably 1000 N / 50 mm or more, more preferably 1500 N / 50 mm or more, and even more preferably 2000 N / 50 mm or more. The same applies to the tensile strength in the transverse direction. The tensile strength is measured in accordance with JIS R 3420 "General Test Methods for Glass Fibers" using a universal testing machine (manufactured by Instron). Furthermore, "N / 50 mm" means the tensile strength when a glass fiber mesh with a width of 50 mm is subjected to the test.

[0019] Glass fiber mesh can be used with a surface coating applied before or after weaving the glass fibers. This is to impart alkali resistance and prevent deterioration of the glass fibers. Examples of such coatings include organic coatings such as vinyl ester resin, vinyl chloride resin, styrene butadiene rubber, and unsaturated polyester resin, as well as inorganic coatings such as zirconia and alumina. An example of a commercially available glass fiber mesh is R131 A101 (raw material: soda lime borosilicate glass, biaxial; coating: styrene butadiene rubber; mesh opening size: 3.5 mm x 3.8 mm; thickness: 0.5 mm; weight: 160 g / m). 2 Tensile strength: 2200N / 50mm (both vertical and horizontal), manufactured by Saint-Gobain, product name).

[0020] The water-based coating composition is a composition containing an acrylic resin emulsion, a filler, an aggregate, a pigment, a thickener, and a film-forming aid. In this finishing method, the coating amount is 0.6 to 1.0 kg / m 2 The viscosity is preferably 500 to 680 Pa·s. A trowel is preferably used as the application tool. The water-based coating composition is applied with a trowel made of stainless steel with a thickness of 0.3 mm to 0.7 mm at an application rate of 0.6 to 1.0 kg / m. 2 The coating is applied and dried so that a continuous trowel wave pattern with a wave interval of 70 to 500 mm is formed in the cross section of the coating film, and then the same aqueous coating composition is applied thereon with the same metal trowel in an amount of 0.6 to 1.0 kg / m 2The coating may also be applied and dried so that a continuous trowel vibration pattern with a wave interval of 1 to 10 mm is formed in the cross section of the coating film. 2 Therefore, in actual application, the trowel is moved with its edge raised, causing the trowel to vibrate, resulting in a so-called chattering state that causes the coating surface to become uneven.

[0021] The sand wall-like coating composition contains an acrylic resin emulsion, a filler, an aggregate, a pigment, a thickener, and a film-forming aid, and has approximately the same color as the water-based coating composition. In this finishing method, the coating amount is 0.2 to 0.4 kg / m 2 The viscosity is preferably 60 to 120 Pa·s. The application tools are preferably trowels or spatulas. It is also recommended to use a roller brush to apply the coating amount of 0.2 to 0.4 kg / m. 2 After spreading and applying the paste, it can be rubbed in a direction approximately perpendicular to the direction of the trowel vibration waves using a metal trowel made of stainless steel with a thickness of 0.3 mm to 0.7 mm, or a spatula made of stainless steel with a thickness of 0.3 mm to 0.7 mm, and then dried.

[0022] The abrasive means directly refers to an abrasive cloth specified in JIS R 6251, an abrasive paper specified in JIS R 6252, a waterproof abrasive paper specified in JIS R 6253, and an abrasive belt specified in JIS R 6256, but it means that any form is acceptable as long as the abrasive particle size is P60 to P150. If abrasive powder adheres to the surface of the coating material abraded with the abrasive means, it is advisable to wipe it with water using a cloth rag or the like and dry it, or to remove the abrasive powder from the coating surface using compressed air or the like.

[0023] The top coat composition is a composition consisting of a silicone-acrylic copolymer resin emulsion having a glass transition temperature of 10 to 50°C, a base agent containing a film-forming aid, and a curing agent containing a silane coupling agent. In this finishing method, the coating amount is 0.1 to 0.2 kg / m. 2The viscosity should preferably be 1 to 3 Pa·s. A short-haired roller brush is the preferred application tool. If the paint is absorbed into the surface of the base coat too quickly, it may be advisable to apply two coats. In this case, the first coat should be 0.08 to 0.15 kg / m. 2 The second coat is applied at 0.05 to 0.12 kg / m 2 The top coat composition improves the hardness of the coating surface and also prevents the coating from being stained, for example, by household pollutants.

[0024] Alternatively, before applying the sealer, or before applying the polymer cement composition if no sealer is used, a nonwoven fabric can be laid across the joints between the plate-like substrates that make up the floor underlayment, and a moisture-permeable elastic base adjuster can be applied on top of the nonwoven fabric and allowed to dry. This further reduces the occurrence of cracks that occur when movement occurs at the joints between the plate-like substrates, which is the object of the present invention.

[0025] The nonwoven fabric is a sheet formed by chemically or thermally entangling raw material yarns or fibers without knitting or weaving them. Examples of raw material yarns or fibers that can be used include aramid, glass, cellulose, nylon, vinylon, polyester, polyethylene, polypropylene, polyolefin, rayon, low-density polyethylene resin, ethylene-vinyl acetate resin, synthetic rubber, copolymer polyamide resin, copolymer polyester resin, or a combination of two or more of these. Nonwoven fabrics are manufactured by a fleece formation method, which forms a fleece, and a fleece bonding method, which bonds the formed fleece. Fleece formation methods include the dry method, wet method, spunbonding method, and meltblown method. Fleece bonding methods include the thermal bond method, chemical bond method, needle punch method, spunlace method, stitch bond method, and steam jet method. Nonwoven fabrics manufactured by any of these methods can be used in this finishing method.

[0026] The nonwoven fabric preferably has a width of 5 to 20 cm, more preferably 7 to 10 cm. The thickness of the nonwoven fabric should be within a range that prevents unevenness due to the nonwoven fabric from occurring in the finished structure formed by this finishing method; specifically, 0.05 to 0.5 mm is preferred, and 0.1 to 0.3 mm is more preferred. The butt joints of the plate-like substrate are preferably positioned at the center of the nonwoven fabric. In cases where the spacing between the butt joints of the plate-like substrate is short and laying the nonwoven fabric across the butt joints results in overlapping and significant unevenness, the nonwoven fabric may be disposed over the entire floor underlayment made of the plate-like substrate. Examples of commercially available nonwoven fabrics include Ekure 3151A (made of polyester, manufactured by Toyobo MC Co., Ltd., product name) and Suncube V3TNV1816A104 (made of vinylon, manufactured by Nittobo Co., Ltd., product name).

[0027] The moisture-permeable elastic surface conditioner is a surface conditioner that forms a coating film that has moisture permeability and elasticity, and any surface conditioner that has these properties can be used. In this finishing method, a moisture-permeable elastic surface conditioner containing a crosslinked acrylic resin emulsion with a glass transition temperature of -20 to 10°C, silica particles with a primary particle size of 5 to 45 nm, a water-soluble cationic polymer, a non-volatile base, a filler, a thickener, a film-forming aid, and a pigment is preferred. In this finishing method, the application amount is 0.2 to 0.6 kg / m 2 It is preferable to apply it with a viscosity of 60 to 120 Pa·s. The preferred application tool is a roller brush. At the joints between the board-shaped substrates of a floor underlayment made of board-shaped substrates, by laying a nonwoven fabric using a moisture-permeable elastic base conditioner, crack resistance is further improved and swelling of the coating film due to the moisture permeability of the moisture-permeable elastic base conditioner can be suppressed.

[0028] In this finishing method, the layer consisting of the nonwoven fabric and the moisture-permeable elastic base adjustment material may also be referred to as a joint treatment layer, the layer consisting of the polymer cement composition and the glass fiber mesh may also be referred to as a reinforcing layer, and the layer consisting of the water-based coating material composition, the sand wall-like paint composition, the polishing means, and the top coat composition may also be referred to as a finishing layer.

[0029] <<Polymer cement composition>> Next, the polymer cement composition used in this finishing method will be described. The polymer cement composition is a composition containing an acrylic resin emulsion, a filler, an aggregate, a thickener, a film-forming agent, hydraulic cement, and water.

[0030] <Acrylic resin emulsion> The acrylic resin emulsion constituting the polymer cement composition used in this finishing method can 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 for 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. 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.

[0031] 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 poly(meth)acrylates). Hydroxyl group-containing monomers such as mono(meth)acrylic acid esters of hydroxyl 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 active hydrogen Epoxy group-containing monomers and oligomers obtained by reaction with ethylenically unsaturated monomers having an epoxide atom; vinyltrimethoxysilane, vinyltriethoxysilane, vinylmethyldimethoxysilane, vinylmethyldiethoxysilane, 3-(meth)acryloxypropyltrimethoxysilane, 3-(meth)acryloxypropyltriethoxysilane, 2-(meth)acryloxyethyltrimethoxysilane, 2-(meth)acryloxyethyltriethoxysilane, 3-(meth)acryloxypropylmethyldi Alkoxysilyl group-containing monomers such as methoxysilane, 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.

[0032] 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 prone to staining, while if it is above 40°C, film formation may be poor. The glass transition temperature here is a value measured using a differential scanning calorimetry (DSC). The resin solids content is preferably 2 to 10 parts by weight per 100 parts by weight of the polymer cement composition. If it is less than 2 parts by weight, adhesion and application workability may decrease, while if it is more than 10 parts by weight, viscosity may increase and application workability may decrease. Commercially available acrylic resin emulsions include TOCRYL W-168 (solids content: 50%, product name, manufactured by Toyochem Co., Ltd.) and Acronal PS743 (solids content: 54 to 56%, resin glass transition temperature: 30°C, copolymer of styrene, acrylic ester, and methacrylic ester, product name, manufactured by BASF).

[0033] <Filler> The filler constituting the polymer cement composition used in this finishing method has an average particle size D 50 This refers to particles with a particle size (50% cumulative particle size by weight) of less than 100 μm, which are blended to adjust the viscosity and application workability of the composition. Heavy calcium carbonate, clay, kaolin, talc, precipitated barium sulfate, barium carbonate, silica sand powder, etc. can be used, with heavy calcium carbonate being inexpensive and reducing the cost burden. The blending amount is preferably 0.1 to 5 parts by weight, more preferably 0.2 to 1 part by weight, per 100 parts by weight of the polymer cement composition. If it is less than 0.1 part by weight, the resin solid content in the composition will be relatively high, and the composition may become sticky and not achieve a smooth finish. If it exceeds 5 parts by weight, the coating material viscosity will be high, which may result in poor application workability.

[0034] <Aggregate> The aggregate constituting the polymer cement composition used in this finishing method has an average particle size D 50This refers to aggregates with an average particle size (50% cumulative particle size by weight) of 100 μm or more, and is blended to allow for thick application. The particle size of the aggregate can be selected arbitrarily as long as it is 100 μm or more. Examples of materials that can be used include silica sand, glass, silica, talc, and heavy calcium carbonate. The blending amount is preferably 20 to 40 parts by weight per 100 parts by weight of the polymer cement composition; if it is less than 20 parts by weight, it may not be possible to apply a thick layer, and if it exceeds 40 parts by weight, workability may decrease. 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.).

[0035] <Thickener> The thickener that constitutes the polymer cement composition used in this finishing method is blended to improve trowel application and water retention, and can be a water-soluble cellulose ether, a urethane-modified polyether, a polycarboxylic acid, or the like. An example of a water-soluble cellulose ether is hi-metolose 90SH15000 (product name, manufactured by Shin-Etsu Chemical Co., Ltd.). The blending amount is preferably 0.05 to 5.0 parts by weight per 100 parts by weight of the polymer cement composition. Less than 0.05 parts by weight may not provide sufficient thickening effect, and if the base is uneven, the coating material may not be applied thick enough to be smooth. More than 5.0 parts by weight may result in reduced application workability.

[0036] <Film-forming aid> The film-forming aid that constitutes the polymer cement composition used in this finishing method is blended with the aim of promoting the fusion of polymer particles in the emulsion and forming a uniform polymer film, and examples of such additives include ethylene glycol diethyl ether, benzyl alcohol, butyl cellosolve, and ester alcohol. The blending amount is preferably 0.1 to 10 parts by weight per 100 parts by weight of the polymer cement composition; if it is less than 0.1 part 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 coating material.

[0037] <Other ingredients> In addition to the above, the polymer cement composition used in this finishing method may contain antifoaming agents, dispersants, preservatives, anti-algae and anti-fungal agents, antifreeze agents, etc., as required.

[0038] The viscosity of the polymer cement composition is preferably 120 to 440 Pa·s; if it is less than 120, the coating material may not be applied smoothly and thickly, and if it exceeds 440, the application workability may be poor. If the viscosity increases due to low temperatures, more than 0 parts by weight but not more than 15 parts by weight of water may be added to 100 parts by weight of each composition, so that the viscosity falls within the above range, as long as the following evaluation test is satisfied.

[0039] <<Water-based coating composition>> Next, we will explain the water-based coating composition used in this finishing method. The water-based coating composition is a composition containing an acrylic resin emulsion, a filler, an aggregate, a pigment, a thickener, and a film-forming aid.

[0040] <Acrylic resin emulsion> The acrylic resin emulsions constituting the aqueous coating composition used in this finishing method can be those described in paragraphs

[0030] and

[0031] . The resin solids content is preferably 5 to 20 parts by weight per 100 parts by weight of the aqueous coating composition; less than 5 parts by weight may result in reduced adhesion and application workability, while more than 20 parts by weight may result in increased viscosity and reduced application workability. A commercially available acrylic resin emulsion is Acronal PS743 (solids content: 55% by weight, BASF, trade name).

[0041] <Filler> The fillers constituting the aqueous coating composition used in this finishing method can be those described in paragraph

[0033] . The blending amount is preferably 3 to 20 parts by weight, more preferably 4 to 12 parts by weight, per 100 parts by weight of the aqueous coating composition. Less than 3 parts by weight may result in insufficient hiding power, such as the color of the base showing through. More than 20 parts by weight may result in high coating viscosity, resulting in poor application workability. Less than 4 parts by weight may result in reduced hiding power depending on the color tone, and more than 12 parts by weight may result in reduced application workability at low temperatures, such as in winter.

[0042] <Aggregate> The aggregates constituting the aqueous coating composition used in this finishing method can be those described in paragraph

[0034] . The blending amount is preferably 40 to 60 parts by weight per 100 parts by weight of the aqueous coating composition; if it is less than 40 parts by weight, it may not be possible to apply it thickly, and if it exceeds 60 parts by weight, workability may decrease.

[0043] <Weight ratio of filler to aggregate> The weight ratio of the filler and aggregate constituting the aqueous coating composition used in this finishing method is preferably filler:aggregate=1:2.8-15.0, and if the aggregate ratio is less than 2.8, it may not be possible to apply the coating thickly, and if it exceeds 15.0, the coating workability may be insufficient. Here, "as a coating" specifically refers to an application amount of 0.6-1.0 kg / m 2 This can be rephrased as "when applying with."

[0044] <Pigments> Pigments that can be used to compose the aqueous coating composition used in this finishing method include inorganic pigments such as titanium oxide, zinc oxide, carbon black, ferric oxide (red iron oxide), lead chromate, lead yellow, yellow iron oxide, etc. Among these, titanium oxide can be used as the main pigment because it has excellent hiding power for the base and is white.

[0045] <Thickener> The thickeners that make up the aqueous coating composition used in this finishing method can be those described in paragraph

[0035] . The preferred blend amount is 0.1 to 5.0 parts by weight per 100 parts by weight of the aqueous coating composition; if less than 0.1 parts by weight, the thickening effect will not be sufficient and the uneven pattern of the coating may be insufficient, while if more than 5.0 parts by weight, application workability may be reduced.

[0046] <Film-forming aid> The film-forming aids that make up the aqueous coating composition used in this finishing method can be those described in paragraph

[0036] . The amount blended is preferably 0.5 to 10 parts by weight per 100 parts by weight of the aqueous coating 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 coating material.

[0047] <Other ingredients> In addition to the above, the aqueous coating composition used in this finishing method may contain antifoaming agents, dispersants, preservatives, anti-algae and anti-fungal agents, antifreeze agents, etc., as required.

[0048] The viscosity of the aqueous coating composition used in this finishing method is preferably 620 to 680 Pa·s; if it is below the lower limit of the range, the coating may not be applied smoothly and thickly, and if it is above the upper limit of each range, the application workability may be poor. If the viscosity increases due to low temperatures, more than 0 parts by weight but not more than 15 parts by weight of water may be added to 100 parts by weight of each composition to adjust the viscosity to within the above range, as long as the following evaluation test is satisfied.

[0049] <<Sand wall-like paint composition>> Next, we will explain the sand wall-shaped paint composition used in this finishing method. The sand wall-shaped paint composition contains an acrylic resin emulsion, a filler, an aggregate, a pigment, a thickener, and a film-forming aid, and is a composition of approximately the same color as the water-based paint composition.

[0050] <Acrylic resin emulsion> The acrylic resin emulsions constituting the sand wall-shaped coating composition used in this finishing method are those described in paragraphs

[0030] and

[0031] . The resin solids content is preferably 5 to 20 parts by weight per 100 parts by weight of the sand wall-shaped coating composition; less than 5 parts by weight may result in reduced adhesion and application workability, while more than 20 parts by weight may result in increased viscosity and reduced application workability. A commercially available acrylic resin emulsion is Acronal PS743 (solids content: 55% by weight, BASF, trade name).

[0051] <Filler> The acrylic resin emulsion constituting the sand wall-shaped coating composition used in this finishing method can be that described in paragraph

[0033] . The blending amount is preferably 10 to 25 parts by weight, more preferably 13 to 21 parts by weight, per 100 parts by weight of the sand wall-shaped coating composition. Less than 10 parts by weight may result in insufficient hiding power, such as the color of the base showing through. More than 25 parts by weight may result in high coating viscosity, resulting in poor application workability. Less than 13 parts by weight may result in reduced hiding power depending on the color tone, and more than 21 parts by weight may result in poor application workability at low temperatures, such as in winter.

[0052] <Aggregate> The acrylic resin emulsion used in this finishing method for the sand wall coating composition can be that described in paragraph

[0034] . It is also incorporated into the sand wall coating composition to smooth the surface of the coating film formed by the water-based coating composition. The preferred amount is 20 to 40 parts by weight per 100 parts by weight of the sand wall coating composition. If it is less than 20 parts by weight, it may not be possible to apply it thickly, and if it exceeds 40 parts by weight, workability may be reduced.

[0053] <Weight ratio of filler to aggregate> The weight ratio of filler to aggregate that constitutes the sand wall-shaped paint composition used in this finishing method is preferably filler:aggregate = 1:1.3-2.7; if the aggregate ratio is less than 1.3, it may not be possible to apply the sand wall-shaped paint thickly or it may be difficult to smooth the coating surface by polishing, and if it exceeds 2.7, hiding power may decrease. "As a sand wall-shaped paint" here specifically refers to an application amount of 0.2-0.4 kg / m. 2 In other words, when applying the filler in a weight ratio of 1:1.3 to 2.7, the preferred combination of the average particle size of the filler and the average particle size of the aggregate is 1:1.3 to 2.7. 50 is 0.1 to 50 μm, and the average particle size of the aggregate D 50 is 100 to 300 μm.

[0054] <Pigments> Pigments that can be used to compose the aqueous coating composition used in this finishing method include inorganic pigments such as titanium oxide, zinc oxide, carbon black, ferric oxide (red iron oxide), lead chromate, lead yellow, yellow iron oxide, etc. Among these, titanium oxide can be used as the main pigment because it has excellent hiding power for the base and is white.

[0055] <Thickener> The thickeners used in the sand wall-shaped coating composition for this finishing method can be those described in paragraph

[0035] . The preferred blending amount is 0.1 to 5.0 parts by weight per 100 parts by weight of the water-based coating composition. If the blending amount is less than 0.1 part by weight, the thickening effect may not be sufficient and the uneven pattern of the coating may be insufficient, and if the blending amount exceeds 5.0 parts by weight, the coating workability may be reduced.

[0056] <Film-forming aid> The film-forming aids constituting the sand wall-shaped coating composition used in this finishing method can be those described in paragraph

[0036] . The blending amount is preferably 0.5 to 10 parts by weight per 100 parts by weight of the aqueous coating 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 coating material.

[0057] <Other ingredients> In addition to the above, the sand wall-shaped coating composition used in this finishing method may contain antifoaming agents, dispersants, preservatives, anti-algae and anti-fungal agents, anti-freezing agents, etc., as required.

[0058] The viscosity of the sand wall coating composition is preferably 60 to 120 Pa·s; if it is below the lower limit of the range, the coating may not be applied smoothly and thick enough, and if it is above the upper limit of the range, the application workability may be poor. If the viscosity increases due to low temperatures, more than 0 parts by weight but not more than 15 parts by weight of water per 100 parts by weight of each composition may be added to adjust the viscosity to within the above range, as long as the following evaluation test is satisfied.

[0059] <<Moisture-permeable elastic base conditioner>> Next, we will explain the moisture-permeable elastic base conditioner used in this finishing method. An example of a moisture-permeable elastic base conditioner is one that contains a cross-linked acrylic resin emulsion with a glass transition temperature of -20 to 10°C, silica particles with a primary particle size of 5 to 45 nm, a water-soluble cationic polymer, a non-volatile base, a filler, a thickener, and a film-forming aid.

[0060] <Cross-linked acrylic resin emulsion> The crosslinked acrylic resin emulsion that constitutes the moisture-permeable elastic base conditioner used in this finishing method is a water-based resin that is the main component of the moisture-permeable elastic base conditioner. The acrylic resin is emulsified with an emulsifier to form micelles, and the emulsion is formed by dispersing the acrylic resin in water together with a water-soluble crosslinking agent such as a hydrazine derivative. The crosslinked type is used to improve elongation properties and to densely coat the coating to improve water resistance. The emulsifier can be an anionic emulsifier that has a hydrophilic group such as a carboxylic acid, sulfonic acid, or phosphoric acid and is anionically charged in aqueous solution. Therefore, the micelles that constitute the crosslinked acrylic resin emulsion are anionically charged.

[0061] The acrylic resins that can be used are those described in paragraphs

[0030] and

[0031] . Crosslinking agents include carbonyl hydrazines such as adipic acid dihydrazide, glutaric acid dihydrazide, isophthalic acid dihydrazide, oxalic acid dihydrazide, malonic acid dihydrazide, succinic acid dihydrazide, sebacic acid dihydrazide, maleic acid dihydrazide, fumaric acid dihydrazide, and itaconic acid dihydrazide, as well as alkyl hydrazides such as hydrazine derivatives such as ethylene-1,2-dihydrazine, propylene-1,3-dihydrazine, and butylene-1,4-dihydrazide, and these can be used alone or in combination of two or more. The amount of crosslinking agent is preferably 0.05 to 2.0 parts by weight per 100 parts by weight of the crosslinked acrylic resin emulsion. If the amount is less than 0.05 parts by weight, the elongation properties may decrease, and if it exceeds 2.0 parts by weight, the coating film may become too dense, resulting in decreased water vapor permeability.

[0062] The glass transition temperature of the acrylic resin constituting the crosslinked acrylic resin emulsion is preferably -20 to 10°C. If the glass transition temperature is below -20°C, cracks may occur in the topcoat applied to the moisture-permeable elastic base conditioner, depending on the topcoat material. This is based on the fact that the glass transition temperature of typical topcoats is often around 20°C, and if the difference in glass transition temperature between the moisture-permeable elastic base conditioner and the topcoat material exceeds approximately 30 to 40°C, the topcoat material may not be able to follow the movement of the moisture-permeable elastic base conditioner, which follows the movement of the base, and ultimately cracks may occur in the topcoat material. Note that such cracks tend to be less likely to occur when the topcoat material is applied relatively thickly, such as a coating material (a few millimeters), but tend to occur more significantly when it is applied relatively thinly, such as a paint (a few tens of micrometers). On the other hand, if the glass transition temperature of the acrylic resin constituting the crosslinked acrylic resin emulsion exceeds 10°C, the base-following ability may be reduced. The glass transition temperature referred to here is a value measured by a differential scanning calorimetry (DSC). The solid content of the crosslinked acrylic resin emulsion is preferably 10 to 30 parts by weight per 100 parts by weight of the moisture-permeable elastic base conditioner; if it is less than 10 parts by weight, various coating strengths will decrease, and if it exceeds 30 parts by weight, application workability will decrease.

[0063] <Silica particles> The silica particles that make up the moisture-permeable elastic base conditioner used in this finishing method are incorporated to impart water vapor permeability to the moisture-permeable elastic base conditioner. It is believed that this water vapor permeability is achieved by the presence of the silica particles in the coating film, which forms a pore structure that allows water vapor to pass through, resulting in the migration of water vapor along the surface of the silica particles. The silica particles are preferably nano-sized, with a primary particle diameter of 5 to 45 nm, and more preferably 10 to 30 nm. Particle diameters less than 5 nm may result in insufficient water vapor permeability or poor dispersion of the silica particles, leading to the formation of aggregates. Particle diameters greater than 45 nm may result in insufficient water-blocking properties. The primary particle diameter is measured by the BET method, or, if the particle diameter is too small to apply the BET method, by the Sears method. The amount of silica particles incorporated is preferably 0.5 to 1.6 parts by weight per 100 parts by weight of the total composition. Less than 0.5 parts by weight may result in insufficient water vapor permeability, while greater than 1.6 parts by weight may result in reduced elongation and water-blocking properties. There are no particular limitations on how silica particles are incorporated in the production of the moisture-permeable elastic base conditioner, but it is preferable to incorporate them in the form of a nanocomposite emulsion or colloidal silica.

[0064] The nanocomposite emulsion is an aqueous resin obtained by emulsifying an acrylic resin containing one or more silica particles with a primary particle diameter of 15 to 30 nm with the action of an emulsifier to form micelles with a diameter of 60 to 120 nm, which are then dispersed in water. The emulsifier can be an anionic emulsifier that has a hydrophilic group such as carboxylic acid, sulfonic acid, or phosphoric acid and is anionically charged in aqueous solution. Therefore, the micelles that make up the nanocomposite emulsion are anionically charged.

[0065] The acrylic resin constituting the nanocomposite emulsion can be one described in paragraphs

[0030] and

[0031] . Furthermore, the silica particles are not particularly limited as long as they have a primary particle diameter of 15 to 30 nm, and the particles may be unmodified with SiOH groups on their surface, or surface-modified with amino or carboxyl groups, for example. One method for producing acrylic resins containing nano-sized silica particles is, for example, miniemulsion polymerization, which involves generating submicron-sized monomer oil droplets (miniemulsions) containing the silica particles using methods such as ultrasonic irradiation, and then polymerizing the monomer oil droplets to convert them into submicron-sized polymeric microparticles. Another method involves growing polymers on the surfaces of the silica particles by graft polymerization. This method involves modifying the surfaces of silica particles with an acrylic monomer-based silane coupling agent, then carrying out emulsion polymerization to grow the shell polymer layer of core-acrylic shell particles. When preparing an acrylic resin containing nano-sized silica particles by these methods, the resin may contain only one silica particle or two or more silica particles, and the weight ratio of the acrylic resin to the silica particles should be 1:3 to 3:1 on average, which can be controlled by the preparation method, the type of acrylic resin, the additives used, etc. Preferably, 10 to 20 parts by weight of the silica particles are contained in 100 parts by weight of the nanocomposite emulsion.

[0066] As mentioned above, the silica particles are preferably 0.5 to 1.6 parts by weight per 100 parts by weight of the composition, so the amount of nanocomposite emulsion to be added must be determined taking into account the amount of silica particles present in the composition due to the addition of the nanocomposite emulsion, and the amount is preferably such that the weight ratio of the solids of the crosslinked acrylic resin emulsion to the solids of the nanocomposite emulsion is 4 to 15: 1. If the solids of the nanocomposite emulsion are below this range, the content of nano-sized silica particles may be reduced, resulting in impaired water vapor permeability, while if they are above this range, the content of the crosslinked acrylic resin emulsion may be reduced, resulting in insufficient elongation properties.

[0067] The colloidal silica is a colloidal dispersion of silica particles having a primary particle size of 5 to 45 nm in water. There are alkaline, neutral, and acidic colloidal silicas, but neutral colloidal silica is preferred because it does not impair the quick-drying properties, dispersibility of the entire composition, or storage stability.

[0068] The amount of silica particles in the colloidal silica is preferably 10 to 40 parts by weight per 100 parts by weight of the colloidal silica. As described above, the amount of silica particles is preferably 0.5 to 1.6 parts by weight per 100 parts by weight of the composition, and therefore the amount of colloidal silica in the composition is determined taking into consideration the amount of silica particles present in the composition due to the incorporation of colloidal silica.

[0069] <Water-soluble cationic polymer> The water-soluble cationic polymer that constitutes the moisture-permeable elastic base conditioner used in this finishing method is blended to impart quick-drying properties. This quick-drying property is believed to be due to the electrical interaction of the water-soluble cationic polymer with anionic-charged micelles (anionic micelles) due to the action of the anionic emulsifier that constitutes the crosslinked acrylic resin emulsion and, when a nanocomposite emulsion is used, the nanocomposite emulsion. This promotes the aggregation of resins and accelerates the film-forming reaction, without waiting for the resins to fuse due to water evaporation during the film-forming process of a typical water-based composition. Before application, all cationic functional groups of the water-soluble cationic polymer are apparently neutral due to their interaction with the non-volatile base (described below). This prevents electrical interaction with the anionic micelles, and the composition is controlled to prevent aggregation during production and storage.

[0070] The water-soluble cationic polymer is not particularly limited as long as it is a polymer having a cationic functional group. Examples include polyalkyleneimine compounds having amino groups, polyamide compounds, aminosulfopolyester compounds, polyallylamine compounds, polyvinylamine compounds, and basic nitrogen-containing polymers obtained by modifying these compounds. Polyalkyleneimine compounds obtained by ionic polymerization of imine compounds are preferred. Among these, polyethyleneimine obtained by polymerizing ethyleneimine is particularly preferred due to its high proportion of cationic functional groups in the molecule. The molecular weight of the water-soluble cationic polymer is preferably a weight-average molecular weight (Mw) of 600 to 200,000 as measured by gel permeation chromatography (GPC). A weight-average molecular weight (Mw) of 600 to 100,000 is more preferred, as a higher Mw increases the viscosity of the additive, making it difficult to handle. If it is less than 600, the quick-drying properties may decrease due to a decrease in the cohesion with the anionic micelles in the crosslinked acrylic resin emulsion and nanocomposite emulsion, while if it exceeds 100,000, the viscosity as an additive will increase in low-temperature environments such as winter, making it difficult to handle.

[0071] The amount of water-soluble cationic polymer blended is adjusted appropriately depending on the type, molecular weight, and ratio of cationic functional groups in the molecule, but in the case of a moisture-permeable elastic base conditioner, it is preferably 0.2 to 1.2 parts by weight per 100 parts by weight of the moisture-permeable elastic base conditioner. If it is less than 0.2 parts by weight, quick-drying properties may decrease, and if it exceeds 1.2 parts by weight, the usable time may be shortened, which may adversely affect application workability.

[0072] <Non-volatile bases> The nonvolatile base that constitutes the moisture-permeable elastic base conditioner used in this finishing method interacts with the cationic functional groups of the water-soluble cationic polymer to render the cationic functional groups apparently neutral during the time between the production of the moisture-permeable elastic base conditioner and its application to the base. This inhibits aggregation of the water-soluble cationic polymer with the crosslinked acrylic resin emulsion and, if a nanocomposite emulsion is used, the anionic micelles in the nanocomposite emulsion, thereby improving the storage stability of the composition. The term "nonvolatile base" refers to a base that does not volatilize into the atmosphere at 25°C and standard pressure (1 atm or 760 mmHg). It preferably has a boiling point above 100°C, and more preferably above 200°C. Nonvolatile bases are broadly classified as organic nonvolatile bases and inorganic nonvolatile bases, but either can be used. Examples of organic nonvolatile bases that can be used include compounds having a basic functional group such as an amino group, such as amino-containing aliphatic alcohols (e.g., 3-amino-1-propanol, 2-amino-2-methyl-1-propanol), amino-containing phenols (e.g., 2-aminophenol, 2-amino-5-chlorophenol, 4-amino-m-cresol), amino-containing ethers (e.g., 3,4'-diaminodiphenyl ether, 4-amino-4'-chlorodiphenyl ether), amino-containing aromatic ketones (e.g., 3'-aminoacetophenone, 2-aminobenzophenone), and amino-containing siloxanes (e.g., 3-(2-aminoethylamino)propyldimethoxymethylsilane, 3-aminopropyldiethoxymethylsilane). Examples of inorganic nonvolatile bases that can be used include sodium hydroxide, potassium hydroxide, and the like, as well as aqueous solutions of these.

[0073] The amount of non-volatile base blended is preferably an amount that causes the pH of the moisture-permeable elastic base conditioner to be 9.5 to 11.5, but this depends on the basicity of the non-volatile base used. If the amount causes the pH to be less than 9.5, storage stability may decrease, and if the amount causes the pH to be more than 11.5, quick-drying properties or water resistance may decrease.

[0074] In addition, non-volatile bases lower the freezing point of water when mixed with it, so they also act as antifreezing agents in moisture-permeable elastic surface conditioners that use water as a solvent. This effect can be synergistically improved by using them in combination with commercially available antifreezing agents.

[0075] <Filler> The filler that constitutes the moisture-permeable elastic base conditioner used in this finishing method has an average particle size of D 50 The filler has a particle size (50% cumulative particle size by weight) of less than 100 μm and is incorporated to adjust the viscosity and application properties of the composition. Examples include heavy calcium carbonate, clay, kaolin, talc, precipitated barium sulfate, barium carbonate, and silica sand powder. Heavy calcium carbonate is inexpensive and can reduce the cost burden. The amount of filler incorporated is preferably 25 to 45 parts by weight, more preferably 30 to 40 parts by weight, per 100 parts by weight of the total composition. Less than 25 parts by weight results in insufficient hiding power, such as the color of the base showing through. More than 45 parts by weight may increase the viscosity of the composition, resulting in poor application workability. Furthermore, less than 30 parts by weight may result in reduced hiding power depending on the color tone, while more than 40 parts by weight tends to result in reduced application workability in low-temperature environments such as winter.

[0076] <Thickener> The thickener in the moisture-permeable elastic base conditioner used in this finishing method is formulated to improve application ease and water retention to prevent the composition from coagulating during storage. It is not particularly limited as long as it provides a moisture-permeable elastic base conditioner with a viscosity of 60 to 150 Pa·s / 23°C and a TI value of 4 to 7. Examples include water-soluble cellulose ethers, urethane-modified polyethers, polycarboxylic acids, and mixtures thereof. Because moisture-permeable elastic base conditioners are preferably used to maintain a pH within the range of 9.5 to 11.5 for storage stability, it is preferable to use urethane-modified polyethers as thickeners, as they do not significantly affect the pH of the composition. Of course, even if other thickeners that may lower the pH are used, they can be used without any problems as long as the pH of the composition can be adjusted to within the range of 9.5 to 11.5 by adjusting the amount of the non-volatile base.

[0077] The amount of thickener blended is preferably 0.1 to 5.0 parts by weight per 100 parts by weight of the total composition, with less than 0.1 part by weight resulting in insufficient thickening effect and insufficient smoothness of the coating material when applied, and more than 5.0 parts by weight resulting in reduced application workability. Furthermore, the weight-average molecular weight (Mw) of the thickener measured by gel permeation chromatography (GPC) is preferably 10,000 to 35,000, with less than 10,000 resulting in insufficient thickening effect, and more than 35,000 resulting in excessive thickening and adversely affecting application workability.

[0078] In addition, as the thickener used in aqueous compositions, inorganic thickeners such as silicate, metal silicate, montmorillonite, colloidal alumina, etc. are also used, but inorganic thickeners often have poor dispersibility, and need to be premixed before being mixed with aqueous resin to prepare a mill base, and need to be stirred at high speed for a long time to disperse uniformly, which may be troublesome and costly.In addition, even if inorganic thickeners are used in this way, they may produce a mud-like coloring derived from minerals, which may have a negative effect on the hiding power of the base and the color development of the topcoat material.For this reason, it is preferable to use organic thickeners.

[0079] <Film-forming aid> The film-forming aids that make up the moisture-permeable elastic base conditioner used in this finishing method are incorporated into crosslinked acrylic resin emulsions and, when using nanocomposite emulsions, to promote the fusion of acrylic resin polymer particles in the nanocomposite emulsion and form a uniform film. Examples of film-forming aids that can be used include those listed in paragraph

[0036] . The preferred blending amount is 0.5 to 10 parts by weight per 100 parts by weight of the total composition. Less than 0.5 parts by weight may result in insufficient film formation in low-temperature environments, such as winter, while more than 10 parts by weight may result in a sticky coating surface that is more susceptible to dirt adhesion.

[0080] <Other ingredients> In addition to the above, the moisture-permeable elastic base conditioner used in this finishing method may contain pigments, antifoaming agents, dispersants, preservatives, anti-algae and anti-fungal agents, antifreeze agents, etc., as needed.

[0081] The viscosity of the moisture-permeable elastic base conditioner is preferably 60 to 150 Pa·s; if it is less than 60 Pa·s, the coating may not be applied smoothly and thick enough, and if it exceeds 150 Pa·s, application workability may be poor. If viscosity increases due to low temperatures, more than 0 parts by weight but not more than 15 parts by weight of water may be added to 100 parts by weight of each composition, so that the viscosity falls within the above range, as long as the following evaluation test is satisfied.

[0082] <<Top Coat Composition>> Next, the top coat composition used in this finishing method will be described.

[0083] The topcoat composition consists of a silicone-acrylic copolymer resin emulsion with a glass transition temperature of 10-50°C, a base resin containing a film-forming aid, and a curing agent containing a silane coupling agent. The glass transition temperature here is a value measured using a differential scanning calorimetry (DSC). If the glass transition temperature is below 10°C, the coating film formed using this finishing method may lack sufficient scratch hardness, while if it is above 50°C, the coating film's ability to conform to the substrate may be reduced.

[0084] <Silicone-acrylic copolymer resin emulsion> The silicone-acrylic copolymer resin emulsion contained in the base of the top coat composition is an emulsion of a silicone-acrylic copolymer resin having a silicone resin main chain and an acrylic group, which is an organic polymer group, at least in either the side chain or the terminal. In the present invention, the polymer cement composition, water-based coating composition, sand-like coating composition, and moisture-permeable elastic base conditioner contain an acrylic resin emulsion, and therefore the organic polymer group is preferably an acrylic group for the purpose of compatibility with the acrylic resin. Furthermore, to strengthen adhesion with the texture-imparting composition, a silane coupling agent is preferably used as the curing agent of the top coat composition. Immediately before application of the top coat composition, the base containing the silicone-acrylic copolymer resin emulsion and a film-forming aid, and the curing agent containing the silane coupling agent are uniformly mixed, and the mixture is applied to the polished coating surface using the polishing means described below.

[0085] The silane coupling agent contained in the curing agent of the top coat composition can be any agent that is hydrolyzed by moisture, such as 2-(3,4-epoxycyclohexyl)ethyltrimethoxysilane or 3-glycidoxypropyltrimethoxysilane.

[0086] The silicone-acrylic copolymer resin, which is the solid content in the silicone-acrylic copolymer resin emulsion, is preferably 15 to 45 parts by weight, more preferably 25 to 35 parts by weight, per 100 parts by weight of the total top coat composition. Less than 15 parts by weight may reduce the abrasion resistance of the coating film formed by this finishing method, while more than 45 parts by weight may reduce the vapor permeability of moisture generated from the substrate, causing the coating to blister. Less than 25 parts by weight tends to reduce the abrasion resistance, while more than 35 parts by weight tends to reduce the vapor permeability.

[0087] <Film-forming aid> The film-forming aid contained in the main component of the top coat composition can be the same as the film-forming aid described above, and the amount of film-forming aid blended is preferably 0.5 to 10 parts by weight per 100 parts by weight of the total 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 coating surface of the top coat composition.

[0088] <Silane coupling agent> The amount of silane coupling agent contained in the curing agent of the top coat composition is preferably 1 to 10 parts by weight, more preferably 3 to 8 parts by weight, per 100 parts by weight of the total top coat composition. If it is less than 1 part by weight, the adhesion between the texture-imparting composition and the top coat composition may decrease, and if it exceeds 10 parts by weight, the compatibility between the base agent and the curing agent may become poor. If it is less than 3 parts by weight, the adhesion tends to decrease, and if it exceeds 8 parts by weight, the compatibility tends to become poor.

[0089] In addition to the silicone-acrylic copolymer resin emulsion, film-forming aid, and silane coupling agent, the top coat composition can also contain organic solvents that are compatible with these components, as well as additives such as antifoaming agents and leveling agents.

[0090] Examples of organic solvents include lower aliphatic alcohols such as methanol, ethanol, isopropanol, n-butanol, and isobutanol; ethylene glycol derivatives such as ethylene glycol, ethylene glycol monobutyl ether, and ethylene glycol monoethyl ether acetate; diethylene glycol derivatives such as diethylene glycol and diethylene glycol monobutyl ether; and diacetone alcohol. One or more of these may be used. Furthermore, toluene, xylene, ethyl acetate, butyl acetate, methyl ethyl ketone, methyl isobutyl ketone, and methyl ethyl ketoxime may also be used in combination with a hydrophilic organic solvent. It is desirable to use an organic solvent that does not dissolve components of a coating tool such as a roller brush used to apply the top coat composition.

[0091] The solid content of the top coat composition is preferably 25 to 55 parts by weight, more preferably 35 to 45 parts by weight, per 100 parts by weight of the total composition. Within this range, good coating hardness is achieved and coating workability is improved.

[0092] The viscosity of the topcoat composition used in this finishing method is preferably 500 to 4000 mPa·s. If it is less than 500 mPa·s, the coating may not be applied smoothly and thickly, and if it exceeds 4000 mPa·s, application workability may be poor. If viscosity increases due to low temperatures, more than 0 parts by weight but not more than 50 parts by weight of water may be added per 100 parts by weight of the composition to adjust the viscosity to within the above range.

[0093] <<Finishing structure>> The finishing structure of the present invention (hereinafter also referred to as "this finishing structure") is formed by the finishing method for a floor subfloor made of the above-mentioned plate-like substrate. Conventionally, when a coating material finish is applied to a floor subfloor made of plate-like substrates, cracks can occur in the finishing structure when movement occurs at the joints between the plate-like substrates. This finishing method, which uses glass fiber mesh, is characterized by the fact that such cracks do not occur. As a result, this finishing structure does not easily crack, and the beauty of the structure immediately after construction can be maintained for a long period of time.

[0094] According to the present disclosure described above, the following means are provided. [Means 1] A method for finishing a floor underlayment made of a plate-like substrate, comprising: applying a sealer to a floor underlayment made of a plate-like substrate as needed and drying it; applying a polymer cement composition containing an acrylic resin emulsion, filler, aggregate, thickener, film-forming aid, hydraulic cement, and water; laying a glass fiber mesh before the polymer cement composition dries; applying the same polymer cement composition again before drying and drying it; applying and drying an aqueous coating composition containing an acrylic resin emulsion, filler, aggregate, pigment, thickener, and film-forming aid; polishing the surface of the dried aqueous coating composition with a polishing means using an abrasive with a grit size of P60 to P150; and finishing by applying a top coat composition containing a base agent containing a silicone-acrylic copolymer resin emulsion having a resin glass transition temperature of 10 to 50°C and the film-forming aid, and a curing agent containing a silane coupling agent. [Means 2] A method for finishing a floor underlayment made from a plate-shaped substrate as described in [Means 1], wherein the glass fiber mesh has a vertical tensile strength of 1000 N / 50 mm or more and a horizontal tensile strength of 1000 N / 50 mm or more. [Means 3] The weight ratio of filler to aggregate in the water-based coating composition is filler:aggregate=1:2.8-15.0, and the water-based coating composition is applied with a stainless steel trowel having a thickness of 0.3-0.7 mm in an amount of 0.6-1.0 kg / m 2 The coating is applied and dried so that a continuous trowel wave pattern with a wave interval of 70 to 500 mm is formed in the cross section of the coating film, and the water-based coating composition is applied thereon with the metal trowel in an amount of 0.6 to 1.0 kg / m 2 The method for finishing a floor underlayment made of the plate-like substrate described in [Means 1], wherein the coating is applied so that a continuous trowel chatter wave pattern with a wave spacing of 1 to 10 mm is formed when viewed in cross section of the coating film. [Means 4] After the water-based coating composition has been applied and dried, but before the polishing, a sand-like coating composition containing an acrylic resin emulsion, a filler, an aggregate, a pigment, a thickener, and a film-forming aid, in which the weight ratio of the filler to the aggregate is 1:1.3 to 2.7, and which has substantially the same color as the water-based coating composition, is applied with a roller brush in an amount of 0.2 to 0.4 kg / m. 2After distributing and applying the trowel vibration waves, a 0.3 to 0.7 mm thick stainless steel metal trowel or spatula is used to rub the trowel vibration waves in a direction approximately perpendicular to the direction of travel of the trowel vibration waves, and then the trowel vibration waves are dried. [Means 5] A method for finishing a floor subfloor made of plate-like substrates as described in [Means 1], comprising: prior to applying the sealer; or, if the sealer is not applied, prior to applying the polymer cement composition; laying a nonwoven fabric across the butt joints between the plate-like substrates that constitute the floor subfloor made of plate-like substrates; and applying and drying a moisture-permeable elastic subfloor conditioner on top of the nonwoven fabric. [Means 6] A method for finishing a floor underlayment made of a plate-shaped substrate as described in [Means 5], wherein the glass fiber mesh has a longitudinal tensile strength of 1000 N / 50 mm or more and a transverse tensile strength of 1000 N / 50 mm or more. [Means 7] The weight ratio of filler to aggregate in the water-based coating composition is filler:aggregate=1:2.8-15.0, and the water-based coating composition is applied with a stainless steel trowel having a thickness of 0.3-0.7 mm in an amount of 0.6-1.0 kg / m 2 The coating is applied and dried so that a continuous trowel wave pattern with a wave interval of 70 to 500 mm is formed in the cross section of the coating film, and the water-based coating composition is applied thereon with the metal trowel in an amount of 0.6 to 1.0 kg / m 2 The method for finishing a floor underlayment made of a plate-like substrate according to [Means 5], wherein the coating is applied so that a continuous trowel chatter wave pattern with a wave spacing of 1 to 10 mm is formed when viewed in cross section of the coating film. [Means 8] After the water-based coating composition has been applied and dried, but before the polishing, a sand-like coating composition containing an acrylic resin emulsion, a filler, an aggregate, a pigment, a thickener, and a film-forming aid, in which the weight ratio of the filler to the aggregate is 1:1.3 to 2.7, and which has substantially the same color as the water-based coating composition, is applied with a roller brush in an amount of 0.2 to 0.4 kg / m. 2 After distributing and applying the trowel vibration waves, a trowel or spatula made of stainless steel having a thickness of 0.3 to 0.7 mm is used to apply the trowel vibration waves in a direction approximately perpendicular to the direction of travel, and then the trowel vibration waves are applied and allowed to dry. [Means 9] A finishing structure formed by the finishing method for a floor underlayment made of a plate-shaped substrate according to any one of [Means 1] to [Means 8].

[0095] The following examples will be described in detail. [Example]

[0096] <Material Preparation> A polymer cement composition, a water-based coating material composition, and a sand wall coating composition were prepared according to the formulations in Table 1. In Table 1, Acronal PS743 (solid content: 54-56%, glass transition temperature of resin: 30°C, copolymer of styrene, acrylic acid ester, and methacrylic acid ester, product name, manufactured by BASF) was used as the acrylic resin emulsion, and silica sand powder #300 (average particle size D 50 25 μm, manufactured by Tochu Co., Ltd., product name) as filler B, with an average particle size D 50 Heavy calcium carbonate BF-200 (manufactured by Bihoku Funka Co., Ltd., product name) with an average particle size of 10 μm was used as filler C. 50 The heavy calcium carbonate SFT-2000 (product name, manufactured by Sankyo Flour Mills) with a particle size of 20 μm was used, and Tohoku Silica Sand No. 7 (specific gravity 1.5, average particle size D 50 150 μm, manufactured by Tohoku Silica Co., Ltd., product name) as aggregate B, and average particle size D 50 The powder used was 200 μm heavy calcium carbonate K-250 (manufactured by Asahikomatsu Co., Ltd., trade name), titanium oxide R-820 (manufactured by Ishihara Sangyo Kaisha, trade name) as a pigment, water-soluble cellulose ether hi-metolose 90SH-15000 (manufactured by Shin-Etsu Chemical Co., Ltd., trade name) as a thickener, Texanol CS-12 (manufactured by Chisso Corporation, trade name) as a film-forming aid, and white cement (white Portland cement, manufactured by Taiheiyo Cement Corporation, trade name) as hydraulic cement. Other additives included antifoaming agents and dispersants, which were selected from commercially available products for water-based coatings.

[0097] [Table 1]

[0098] Moisture-permeable elastic base conditioners I and II were prepared according to the formulations in Table 2. In Table 2, Acronal YJ2741D (solid content: 56%, resin glass transition temperature: -14°C, acrylic and styrene copolymer, containing 0.1 to 1.0 wt% carbonyl hydrazide as a crosslinking agent, product name, manufactured by BASF) was used as the crosslinked acrylic resin emulsion, and Col.9 was used as the nanocomposite emulsion. 1200 (solid content: 40%, silica content: 15%, primary particle size of silica particles: 15-30 nm, average particle size of micelles: 90 nm, glass transition temperature of resin: 2°C, acrylic copolymer, product name of BASF), ST-C (silica content: 20%, primary particle size of silica particles: 12 nm, product name of Nissan Chemical Co., Ltd.) was used as colloidal silica, Lupersol FG (polyethyleneimine, solid content: 99%, weight average molecular weight (Mw): 800, product name of BASF) was used as water-soluble cationic polymer, 2-amino-2-methyl-1-propanol (boiling point: 165°C) was used as non-volatile base, and heavy calcium carbonate WA (average particle size D 50 10 μm, product name, manufactured by Shiraishi Calcium Co., Ltd.), SN Thickener 665T (weight average molecular weight (Mw): 19,800, product name, manufactured by San Nopco Co., Ltd.) was used as thickener A, SN Thickener 612 (weight average molecular weight (Mw): 19,400, product name, manufactured by San Nopco Co., Ltd.) was used as thickener B, Texanol CS-12 (product name, manufactured by Chisso Corporation) was used as the film-forming aid, and titanium oxide R-820 (product name, manufactured by Ishihara Sangyo Kaisha, Ltd.) was used as the pigment. Other additives included an antifoaming agent, dispersant, preservative, and antifreeze agent appropriately selected from commercially available additives used in aqueous compositions. The pH of each moisture-permeable elastic base conditioner is shown.

[0099] [Table 2]

[0100] The topcoat composition was prepared by adding 5 parts by weight of 3-glycidoxypropyltrimethoxysilane as a curing agent to 100 parts by weight of JC-40A (silicone-acrylic copolymer resin emulsion 60 parts by weight (solid content: 45% by weight), film-forming aid 3 parts by weight, water 22 parts by weight, other additives 15 parts by weight, Aica Kogyo Co., Ltd., product name) as the main agent, and mixing uniformly just before application.

[0101] The finishing method for floor underlayment made of the plate-shaped substrates of the Examples and Comparative Examples was carried out according to the layer configurations of the joint treatment layer, reinforcing layer, and finishing layer in Table 3. Ekure 3151A (raw material: polyester, manufactured by Toyobo MC Co., Ltd., trade name) was used as the nonwoven fabric, and R131 A101 (raw material: soda-lime borosilicate glass, biaxial, coating: styrene-butadiene rubber, mesh opening size: 3.5 mm x 3.8 mm, thickness: 0.5 mm, weight: 160 g / m) was used as the mesh. 2 , tensile strength: 2200N / 50mm (both vertical and horizontal), Saint-Gobain, trade name), Ekure 3151A (nonwoven fabric, material: polyester, tensile strength: 39N / 50mm (vertical), 13N / 50mm (horizontal), Toyobo MC Co., Ltd., trade name), and JBX-PP (material: polypropylene, triaxial, mesh opening size: 7.0mm x 7.0mm, thickness: 0.3mm, weight: 67.5g / m 2 Tensile strength: 600N / 50mm (both vertical and horizontal), product name: Aica Kogyo Co., Ltd. The construction process is indicated by "〇" or by describing the material used, and the layer that was not constructed is indicated by "-".

[0102] [Table 3]

[0103] <Evaluation method> The following evaluations were carried out for the above 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.

[0104] <Design> A water-based acrylic resin sealer JS-500 (solid content: 40% by mass, product name, manufactured by Aica Kogyo Co., Ltd.) was applied at a rate of 0.075 kg / m on a flexible board (150 x 210 mm, thickness 10 mm) conforming to JIS A 5430. 2 After drying, in Examples 2 and 3 and Comparative Examples 2 to 4, a nonwoven fabric cut to the size of the substrate was laid on top of the coated surface, and the moisture-permeable elastic base conditioner was applied with a stainless steel trowel in an amount of 0.6 kg / m 2 Then, in Examples 1 to 3 and Comparative Examples 3 and 4, the polymer cement composition was applied in an amount of 1.5 kg / m using a stainless steel trowel. 2 A mesh cut to the size of the substrate shown in Table 3 was placed on the surface, and the same polymer cement composition was again applied at an amount of 1.0 kg / m. 2 After drying, the water-based coating composition was applied in an amount of 0.8 kg / m using a 0.5 mm thick stainless steel trowel. 2 The coating was then dried so that a continuous trowel wave pattern with a wave interval of 70 to 500 mm was formed in the cross section of the coating film. Next, the same water-based coating composition was applied with the same stainless steel trowel at an amount of 0.8 kg / m 2 The coating composition was applied and dried so that a continuous trowel chatter wave pattern with a wave interval of 1 to 10 mm was formed in the cross section of the coating film. 2 After spreading the coating using a roller brush, the coating was rubbed with the same stainless steel metal trowel in a direction approximately perpendicular to the direction of the trowel vibration wave and then dried. Next, the surface of the coating was polished with abrasive paper having an abrasive grain size of P80. Finally, the top coat composition was applied with a short-medium bristle roller brush at an application rate of 0.15 kg / m 2 The coating film surface was visually evaluated as having a texture rich in inorganic design, with a rating of ◯, and as not having such a texture, with a rating of x.

[0105] <Zero span tension test> A flexible board (100 x 100 mm, 10 mm thick) conforming to JIS A 5430 was used as the base, and two pieces were butted together with their ends facing each other, with the backs 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 base as a sealer at a rate of 0.2 kg / m. 2 and cured for 4 hours. After drying, the test specimens were finished in the same manner as the sealer described above in <Design>, and cured for 14 days to obtain test specimens. The temporary masking tape on the backside was removed, and both ends of the test specimen were pulled at 2 mm / min using a universal testing machine (manufactured by Instron), and the distance at which pinholes appeared in the butted areas was measured. A distance of 3 mm or more was evaluated as excellent crack resistance, with a rating of ⊚; a distance of less than 3 mm but 1.5 mm or more was evaluated as having crack resistance, with a rating of ◯; and a distance of less than 1.5 mm was evaluated as not having crack resistance, with a rating of x.

[0106] <Wear resistance> A flexible board (100 x 100 mm, 10 mm thick) conforming to JIS A 5430 was used as the base, and water-based epoxy resin primer JDE-921 (manufactured by Aica Kogyo Co., Ltd., product name; the same applies below) was applied at a rate of 0.1 kg / m. 2 The coating was applied to the test piece and cured for 4 hours. After drying, the test piece was finished in the same manner as the sealer described above in <Design>, and cured for 14 days to prepare a test specimen. The test specimen was subjected to an abrasion test in accordance with JIS K 7204 (abrasion wheel CS-17, load 4.9 N, 1000 rpm). Abrasion amounts of less than 100 mg were evaluated as ◯, and abrasion amounts of 100 mg or more were evaluated as ×.

[0107] <Slip resistance> A flexible board (300 x 300 mm, 10 mm thick) conforming to JIS A 5430 was used as the base, and water-based epoxy resin primer JDE-921 was applied at a rate of 0.1 kg / m. 2The coating was applied to the floor and cured for 4 hours. After drying, the coating was finished in the same manner as the sealer described above in <Design>, and cured for 14 days to prepare test specimens. The slip resistance coefficient (CSR) of the test specimens was measured in accordance with the "Slip Test Method for Coated Floor Materials (NNK-003)". A slip resistance coefficient (CSR) of 0.6 or more was evaluated as ◯, and a CSR of less than 0.6 was evaluated as ×.

[0108] <Impact resistance> The base was a pavement board (300 x 300, 60 mm thick) specified in JIS A 5371, and water-based epoxy resin primer JDE-921 was applied at a rate of 0.1 kg / m. 2 The pavement boards were coated with the same coating composition as above and left to cure for 4 hours. After drying, the coating was finished in the same manner as the sealer described above in <Design>, and then left to cure for 14 days to prepare test specimens. The test specimens were subjected to a ball drop impact test in accordance with "NNK-0002". The number of times the ball was dropped before cracks appeared in the pavement boards was measured, and 30 or more times was evaluated as ◯, and less than 30 times was evaluated as ×.

[0109] <Adhesion> The base was a pavement board (300 x 300, 60 mm thick) specified in JIS A 5371, and the water-based epoxy resin primer JDE-921 was applied at a rate of 0.1 kg / m. 2 and cured for 4 hours. After drying, the test specimens were finished in the same manner as the sealer described above in <Design>, and cured for 14 days in an environment of 23°C temperature, 50% RH humidity, and 40°C or 5°C temperature. After that, adhesion tests were carried out at each temperature using a Building Research Institute-type tensile tester. Tests in which the failure mode was cohesive failure of the pavement board at all temperatures were rated as good, and all other tests were rated as bad.

[0110] <Blistering resistance> The substrate used was a cement mortar board (70 x 70, thickness 20 mm) specified in JIS A 69097.3 Test Substrate (b) for adhesion strength test and hot and cold cycle test, and water-based epoxy resin primer JDE-921 was applied at a rate of 0.1 kg / m. 2and cured for 4 hours. After drying, the test specimens were finished using the same procedure as for the sealer described above in <Design>, and cured for 14 days in an environment with a temperature of 23°C, humidity of 50% RH, and a temperature of 40°C or 5°C. Then, the test specimens were waterproofed on all four sides with epoxy putty, and subjected to 10 cycles of "immersion in 23°C water for 18 hours" → "standing still at -20°C for 3 hours" → "standing still at 50°C for 3 hours." Visual inspection of the coating film to show no defects such as peeling or swelling was evaluated as "Good," and all other cases were evaluated as "Poor."

[0111] <Heel mark resistance> A flexible board (150 x 150 mm, 10 mm thick) conforming to JIS A 5430 was used as the base, and water-based epoxy resin primer JDE-921 was applied at a rate of 0.1 kg / m. 2 and cured for 4 hours. After drying, the finish was performed in the same manner as the sealer in the above <Design>, and cured for 14 days to obtain a test specimen. The test specimen was subjected to a heel mark resistance test in accordance with JIS K 3920, and the color difference (ΔE) of the test specimen before and after the test was measured using a color difference meter CR-410 (manufactured by Konica Minolta Sensing Co., Ltd.). A ΔE of 3 or less was evaluated as ◯, and a ΔE of more than 3 was evaluated as ×.

[0112] <Resistance to contamination from everyday substances> A flexible board (80mm x 265mm, 4mm thick) conforming to JIS A 5430 was used as the base, and a solvent-based chlorinated rubber primer (JS-410, product name, manufactured by Aica Kogyo Co., Ltd.) was applied as the sealer at an application rate of 0.1kg / m. 2 and cured for at least 4 hours. After drying, the test specimens were finished using the same procedure as for the sealer described above in <Design>, and cured for 14 days to prepare test specimens. Various household pollutants were dropped onto the coating surface of the test specimens in accordance with the stain resistance test of JIS K6902, and the household pollutants were wiped off 16 hours after the dripping and evaluated. The evaluation was based on the following 5-point scale, with anything other than 1 being considered good. For all household pollutants, good resistance was evaluated as ○, and poor resistance was evaluated as ×. The household pollutants used were ethanol, acid bleach, chlorine bleach, coffee, soy sauce, and sauce. 5: Wiping with a dry cotton cloth removes contaminants without affecting the coating 4: Contaminants can be removed by wiping with water, leaving the coating unchanged 3: Contaminants can be removed with mild detergent water, leaving the coating unchanged 2: Ethanol can remove contaminants without affecting the coating 1: Severe contamination has occurred and the paint film has changed in gloss and color

[0113] <Evaluation results> The evaluation results are shown in Table 4.

[0114] [Table 4]

Claims

1. If necessary, apply a sealer to the floor base made of a board-shaped substrate and allow it to dry. A polymer cement composition containing an acrylic resin emulsion, a filler, an aggregate, a thickener, a film-forming agent, hydraulic cement, and water is applied to the surface. a glass fiber mesh is laid on the polymer cement composition before drying; Before the polymer cement composition is dried, the polymer cement composition is applied again and dried; A water-based coating composition containing an acrylic resin emulsion, a filler, an aggregate, a pigment, a thickener, and a film-forming aid is applied and dried, The surface of the dried aqueous coating composition is polished with a polishing means having an abrasive grain size of P60 to P150, Finishing is done by applying a topcoat composition comprising a base agent containing a silicone-acrylic copolymer resin emulsion having a resin glass transition temperature of 10 to 50°C, a film-forming aid, and a curing agent containing a silane coupling agent. A finishing method for floor subfloor consisting of a board-shaped substrate.

2. The glass fiber mesh has a longitudinal tensile strength of 1000 N / 50 mm or more and a transverse tensile strength of 1000 N / 50 mm or more. A method for finishing a floor underlayment made of the plate-like substrate according to claim 1.

3. The weight ratio of filler to aggregate in the aqueous coating composition is filler:aggregate=1:2.8 to 15.0, The water-based coating composition is applied with a stainless steel trowel having a thickness of 0.3 to 0.7 mm at a coating amount of 0.6 to 1.0 kg / m ２ The coating is applied and dried so that a continuous trowel wave pattern with a wave interval of 70 to 500 mm is formed in the cross section of the coating film, and the water-based coating composition is applied thereon with the metal trowel in an amount of 0.6 to 1.0 kg / m ２ , and is applied so that a continuous trowel chatter wave having a wave interval of 1 to 10 mm is formed when viewed in cross section of the coating film; A method for finishing a floor underlayment made of the plate-like substrate according to claim 1.

4. After applying and drying the aqueous coating composition, and before the polishing, A sand wall-shaped coating composition containing an acrylic resin emulsion, a filler, an aggregate, a pigment, a thickener, and a film-forming aid, in which the weight ratio of the filler to the aggregate is 1:1.3 to 2.7, and which has substantially the same color as the water-based coating composition, is applied with a roller brush in an amount of 0.2 to 0.4 kg / m. ２ After distributing and applying the coating, a trowel or spatula made of stainless steel having a thickness of 0.3 to 0.7 mm is used to apply the coating in a direction approximately perpendicular to the direction of the trowel chatter wave, and then the coating is dried. A method for finishing a floor underlayment made of the plate-like substrate according to claim 3.

5. Before applying the sealer, or before applying the polymer cement composition if the sealer is not applied, A nonwoven fabric is laid across the butt joints between the plate-shaped substrates that make up the floor underlayment, Apply a moisture-permeable elastic base adjuster on top of this and let it dry. A method for finishing a floor underlayment made of the plate-like substrate according to claim 1.

6. The glass fiber mesh has a longitudinal tensile strength of 1000 N / 50 mm or more and a transverse tensile strength of 1000 N / 50 mm or more. A method for finishing a floor underlayment made of the plate-like substrate according to claim 5.

7. The weight ratio of filler to aggregate in the aqueous coating composition is filler:aggregate=1:2.8 to 15.0, The water-based coating composition is applied with a stainless steel trowel having a thickness of 0.3 to 0.7 mm at a coating amount of 0.6 to 1.0 kg / m ２ The coating is applied and dried so that a continuous trowel wave pattern with a wave interval of 70 to 500 mm is formed in the cross section of the coating film, and the water-based coating composition is applied thereon with the metal trowel in an amount of 0.6 to 1.0 kg / m ２ , and is applied so that a continuous trowel chatter wave having a wave interval of 1 to 10 mm is formed when viewed in cross section of the coating film; A method for finishing a floor underlayment made of the plate-like substrate according to claim 5.

8. After applying and drying the aqueous coating composition, and before the polishing, A sand wall-shaped coating composition containing an acrylic resin emulsion, a filler, an aggregate, a pigment, a thickener, and a film-forming aid, in which the weight ratio of the filler to the aggregate is 1:1.3 to 2.7, and which has substantially the same color as the water-based coating composition, is applied with a roller brush in an amount of 0.2 to 0.4 kg / m. ２ After distributing and applying the coating, a trowel or spatula made of stainless steel having a thickness of 0.3 to 0.7 mm is used to apply the coating in a direction approximately perpendicular to the direction of the trowel chatter wave, and then the coating is dried. A method for finishing a floor underlayment made of the plate-like substrate according to claim 7.

9. A finished structure formed by the method for finishing a floor underlayment made of a plate-like substrate according to any one of claims 1 to 8.

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