JP2020007165A - Coating material composition and manufacturing method of colored cement-based decorative material - Google Patents

Abstract

To provide a coating material composition capable of suppressing color unevenness by being coated on a decorated surface of a cement-based decorative material having exposed cement-based substrate and decorative members so as to color the cement-based substrate on the decorated surface while keeping an appearance of the decorative member.SOLUTION: The coating material composition is used for a cement-based decorative material 110 having the decorated surface on which a cement-based substrate 12 and the decorative member are exposed, to color the cement-based substrate on the decorated surface. The coating material composition contains a coloring material, a resin emulsion and an alkali metal silicate, and the alkali metal silicate content is 5 pts.mass or more per 100 pts.mass of a solid content of the resin emulsion.SELECTED DRAWING: Figure 1C

Description

  The present invention relates to a coating material composition and a method for producing a colored cement-based decorative material.

  For example, various cement-based decorative materials are installed on floors, road surfaces, wall surfaces, and the like of parks and other premises, promenades, and buildings (for example, approaches and entrances of public facilities, commercial facilities and houses, etc.). ing. Here, the cement-based decorative material means that a cement-based substrate formed of a cement composition and a decorative member such as beautiful aggregate (cobble stone, natural stone, artificial stone, etc.) or tile are exposed on the surface side. In this state, the decorative member is a decorative material in which the decorative member is fixed to a cement base material or the like. Such a decorative material is referred to as a cement-based decorative material in this specification because it looks more beautiful and beautiful than the surface of the cement-based substrate itself. The surface of the cement-based decorative material where the cement-based material and the decorative member are exposed is referred to as a decorative surface.

  For example, in a cement-based decorative material using a tile or the like as a decorative member, a cement composition forming the cement-based substrate is applied to a body so that joints (exposed portions of the cement-based substrate) are formed on a decorative surface. Then, the decorative member may be obtained by a method of attaching the decorative member thereto (attaching method). Also, a cement-based decorative material using beautiful aggregate as a decorative member is, for example, a large number of beautiful aggregates in a state in which a cement-based material and a large number of beautiful aggregates are exposed on the surface side on a skeleton. Is fixed by a cement base material, a resin binder, or the like (for example, see Patent Documents 1 to 4).

JP-A-2-066259 JP-A-9-111706 JP-A-9-087063 JP 2004-244434 A

  In a cement-based decorative material having a decorative surface in which a cement-based material and a decorative member are exposed on the surface side, the exposed cement-based material on the decorative surface is affected by sunlight, wind and rain, and may change over time. Deterioration and contamination occur. In addition, since the exposed cement-based substrate on the decorative surface of the cement-based decorative material is a cement-based substrate, a white product (white flower) that emerges on the surface portion may be generated. The white spot phenomenon and the color unevenness due to the above-mentioned deterioration and dirt may cause a problem in appearance on the decorative surface of the cement-based decorative material.

  On the other hand, if color unevenness occurs on the exposed cement-based substrate on the decorative surface of the cement-based decorative material, if a general paint is applied to the entire decorative surface in order to conceal the color unevenness, the surface of the decorative member may be damaged. Also, a coating film is formed, which changes the appearance of the decorative member. Therefore, when color unevenness or deterioration occurs in the exposed cement-based substrate on the decorative surface of the cement-based decorative material, the exposed cement-based substrate is repaired. For example, in a cement-based decorative material using a beautiful aggregate as a decorative member, repair is performed by rubbing a cement composition into an exposed cement-based substrate on a decorative surface. Further, for example, in a cement-based decorative material using a tile as a decorative member, repair is performed by filling a cement-based base material (joint) exposed on a decorative surface with a tile joint material such as a cement composition. However, since cement is used for these repairs as well as cement-based materials, it is easy to cause white blossoms, and it is easy to produce a cement color (due to the shading of the gray color), and there are many color variations It is hard to turn.

  Accordingly, the present invention provides a cement-based decorative material in which the cement-based substrate and the decorative member are applied to the exposed decorative surface, thereby coloring the cement-based substrate while maintaining the appearance of the decorative member on the decorative surface. It is intended to provide a coating material composition capable of suppressing color unevenness.

  That is, according to the present invention, it is a coating material composition used for a cement-based decorative material having a decorative surface on which a cement-based substrate and a decorative member are exposed, and for coloring the cement-based substrate on the decorative surface. A coating material composition comprising: a coloring material, a resin emulsion, and an alkali metal silicate, wherein the content of the alkali metal silicate is 5 parts by mass or more per 100 parts by mass of the solid content of the resin emulsion. .

  According to the present invention, the cement-based base material and the decorative member in the cement-based decorative material are applied to the exposed decorative surface, so that the decorative surface of the decorative surface can be maintained while maintaining the appearance of the decorative member. A coating material composition that can be colored to suppress color unevenness can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure for demonstrating an example of the manufacturing method of the coloring cement type cosmetic material of one Embodiment of this invention, and has a decorative surface (finished surface of a decorative aggregate layer) to which a coating material composition is applied. It is sectional drawing which represents a cement type cosmetic material typically. FIG. 1B is a cross-sectional view schematically illustrating a state in which a coating material composition is applied to a decorative surface (finished surface of a decorative aggregate layer) of the cement-based decorative material illustrated in FIG. 1A. FIG. 1B schematically shows a state in which the coating material composition attached to the surface of the decorative member (beautiful aggregate) on the decorative surface (finished surface of the decorative aggregate layer) of the cement-based decorative material shown in FIG. 1B has been washed away. It is sectional drawing. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure for demonstrating an example of the manufacturing method of the coloring cement type cosmetic material of one Embodiment of this invention, and the cement type cosmetics which have a decorative surface (tiling finish surface) to which a coating material composition is applied. It is sectional drawing which represents a material typically. FIG. 2B is a cross-sectional view schematically illustrating a state in which a coating material composition is applied to a decorative surface (tiled finish surface) of the cement-based decorative material illustrated in FIG. 2A. FIG. 2B is a cross-sectional view schematically illustrating a state in which the coating material composition attached to the surface of the decorative member (beautiful aggregate) on the decorative surface (tiled surface) of the cement-based decorative material illustrated in FIG. 2B has been washed away. is there.

  Hereinafter, embodiments of the present invention will be described, but the present invention is not limited to the following embodiments.

<Coating composition>
The coating material composition of one embodiment of the present invention (hereinafter, may be simply referred to as “coating material composition”) is a cement-based decorative material having a decorative surface in which a cement-based substrate and a decorative member are exposed. Is used to color a cement-based substrate on a decorative surface. The coating material composition includes a coloring material, a resin emulsion, and an alkali metal silicate. The content of the alkali metal silicate in the coating material composition is at least 5 parts by mass per 100 parts by mass of the solid content of the resin emulsion.

  The coating material composition contains an alkali metal silicate in an amount in a specific range, so that when applied to the decorative surface of a cement-based decorative material, compared to the decorative member on the decorative surface, the cement-based base material on the decorative surface On the other hand (easy to stick firmly). This is considered to be due to the fact that the alkali metal silicate contained in the coating material composition in a specific range amount reacts with the calcium component contained in the cement base material on the decorative surface. A predetermined time after the coating material composition is applied to the decorative surface of the cement-based decorative material, the surface of the cement-based base material on the decorative surface can be colored, and the decorative surface can be washed or wiped off, so that the decorative surface can be washed. The coating material composition on the surface of the member can be easily washed off. Therefore, by the coating material composition, while maintaining the appearance of the exposed decorative member on the decorative surface, it is possible to color the exposed cement-based substrate on the decorative surface, efflorescence of the cement-based substrate, deterioration, and It is possible to suppress color unevenness and color change due to dirt or the like.

  When the coating material composition is applied to the decorative surface, and when coloring the exposed surface of the cement-based substrate on the decorative surface, the coating material composition may be impregnated into the cement-based substrate, and A coating film may be formed on the cement-based base material. The formation of a coating film of the coating material composition on the exposed cement-based substrate on the decorative surface is effective in suppressing the deterioration of the exposed cement-based substrate on the decorative surface, improving wear resistance, and improving weather resistance. Can also contribute, which is preferable.

  First, an object to which the coating material composition is used, that is, a cement-based decorative material having a decorative surface to which the coating material composition is applied will be described. The cement-based decorative material includes a cement-based substrate and a decorative member. The cement-based decorative material has a decorative surface in which the cement-based material and the decorative member are exposed on the surface side. The coating material composition is applied to the decorative surface.

  The cement base material is a base material in which cement is used as a raw material, and is, for example, a hardened material formed of a cement composition such as cement paste, mortar, and ready-mixed concrete. As the cement base material, a cement paste obtained by mixing water with cement, a mortar obtained by adding fine aggregate (sand) to the raw material of the cement paste, and a coarse aggregate (gravel) added to the raw material of the mortar were used. Any hardened product of ready-mixed concrete may be used.

  The decorative member is a member that can give a base on which the cement-based decorative material is provided a cleaner appearance than the surface of a mere cement-based substrate. It is preferable to use a material other than cement as the decorative member, and it is more preferable to use a material that does not react with the alkali metal silicate contained in the coating material composition. Suitable decorative members include, for example, beautiful aggregates such as cobblestones, natural stones, artificial stones, artificial stones, marbles, and seed stones; porcelain, ceramic, ceramic, wooden, and plastic tiles; Glass products; glass blocks; and those obtained by crushing waste glass materials into aggregates. One or more of these decorative members can be used.

  As the decorative surface in which the cement base material and the decorative member in the cement decorative material are exposed on the surface side, for example, a beautiful aggregate such as a so-called wash-finished surface, a terrazzo-finished surface, a sharpened-finished surface, etc. And a tiled finished surface including a tile as a decorative member.

  The finished surface of the decorative aggregate layer refers to the surface of the decorative aggregate layer, which is a cement-based decorative material, provided on the base. This decorative aggregate layer is a layer formed with a cement base material and a number of beautiful aggregates fixed with the cement base material exposed on the surface. The decorative aggregate layer is, for example, a cement composition for forming a cement-based substrate applied to a substrate, and a number of beautiful aggregates are partially buried and laid on the applied cement composition such that the surface is exposed. Can be formed by curing the cement binder. In addition, for the decorative aggregate layer, for example, a mixture containing the cement composition and the beautiful aggregate is applied to the substrate, and after applying a setting retardant thereon, the cement composition other than the surface layer is cured, and the uncured It can also be formed by washing out and removing the cement composition of the surface layer portion with water. Such a method is called a washing method by washing with water. Further, the decorative aggregate layer, for example, after applying a mixture containing a beautiful aggregate and a resin binder to a substrate, filling between the beautiful aggregate with a cement composition, the cement composition was initially set. Sometimes it can also be formed by removing the cement composition covering the surface of the beautiful aggregate so that the surface is exposed. Such a method is also called a washing method. In addition, the decorative aggregate layer is, for example, terrazzo finish and sharpening finish, for example, a mixture of a beautiful aggregate and a cement composition is applied to an undercoat layer such as cement mortar provided on a base, and cement is applied. After curing of the composition, it can also be formed by polishing and polishing the surface.

  The tile-finished surface includes a plurality of tiles attached to a base via a cement-based substrate so that joints are formed, and a joint portion (exposed portion of the cement-based substrate). Refers to the surface. For this tiled surface, for example, a cement composition (cement paste, mortar, ready-mixed concrete, etc.) that forms a cement-based substrate is applied to a substrate, and a plurality of tiles are arranged thereon so that joints are formed. It can be formed including a bonding step and the like. On the tiled surface, the exposed cementitious base material, which is the joint, may be a cured product of the cement composition used as an adhesive for attaching the tile to the base, and may be used as a joint filler in the joint. It may be a cured product of the cement composition used.

  The substrate on which the cement-based decorative material is provided includes mortar, concrete, asphalt, slate, and the like, but is not particularly limited as long as the cement-based decorative material can be formed.

  A coating material composition is used for the cement-based decorative material described above. The coating material composition includes a coloring material, a resin emulsion, and an alkali metal silicate. As the form of these components, the resin emulsion is liquid, and the coloring material and the alkali metal silicate may be liquid or solid. The form of the coating material composition containing these components is liquid (including glue-like and paste-like) at the time of use (application), but even if the components are mixed immediately before application, Good. Therefore, before application, the coating material composition may be in a form including a solid composition (for example, a powder composition containing a particulate component) and a liquid composition containing a resin emulsion. Good. For example, the coating composition may be a solid composition (powder composition) and a liquid composition each provided in separate containers. Hereinafter, each component of the coating material composition will be described.

  The coating material composition contains a coloring material. When the coating material composition contains a coloring material, the exposed cement-based substrate on the decorative surface of the cement-based decorative material can be colored with the coating material composition (the coloring material in the coating material composition). Examples of the color by the color material include white, gray, black, red, yellow, green, blue, purple, yellow-red, yellow-green, blue-green, blue-violet, and red. Each color such as purple and brown can be mentioned, but the color is not limited thereto.

  The coloring material is not particularly limited, and pigments such as inorganic pigments and organic pigments, and dyes such as natural dyes and synthetic dyes can be used. One or more of these coloring materials can be included in the coating material composition. It is preferable to use a pigment (color pigment) as the coloring material. Examples of the inorganic pigment include titanium dioxide, zinc white, lithopone, iron oxide, lead red, chromium vermillion, graphite, zinc yellow, chromium oxide, ultramarine, navy blue, and carbon black. As the organic pigment, for example, azo pigments such as monoazo pigment, disazo pigment, and pyrazolone pigment; and phthalocyanine pigment, quinacridone pigment, perinone pigment, isoindolinone pigment, isoindoline pigment, xanthene pigment, dioxazine pigment, anthraquinone pigment, and And polycyclic pigments such as quinophthalone pigments.

  The content of the coloring material in the coating material composition is preferably 0.5 to 10% by mass, more preferably 1 to 10% by mass, based on the mass of the total solid content of the coating material composition. More preferably, it is 2 to 8% by mass.

  Further, the coating material composition contains a resin emulsion. Since the coating material composition contains the resin emulsion, the coloring material in the coating material composition can be fixed to the surface of the exposed cement-based substrate on the decorative surface of the cement-based decorative material, and the coating film Is easy to form.

  The resin emulsion is not particularly limited as long as it is an emulsion resin. Examples of the resin emulsion include an acrylic resin emulsion, a urethane resin emulsion, a styrene resin emulsion, a vinyl acetate resin emulsion, a vinyl chloride resin emulsion, a fluorine resin emulsion, a silicone resin emulsion, and a vinyl chloride-acrylic resin. Emulsion, styrene-acrylic resin emulsion, vinyl acetate-acrylic resin emulsion, ethylene-vinyl acetate-based resin emulsion, ethylene-vinyl chloride-based resin emulsion, ethylene-vinyl acetate-acrylic-based resin emulsion, ethylene-vinyl acetate-vinyl chloride Resin-based emulsion, vinyl chloride-vinyl acetate-based resin emulsion, silicone-acrylic-based resin emulsion, and silicone-urethane-based resin emulsion. It is possible. One or two or more of these resin emulsions can be used.

  As the resin emulsion, an acrylic resin emulsion is preferable. In the present specification, the acrylic resin refers to a constituent unit derived from a monomer having an acryloyl group and / or a methacryloyl group in an amount of 50 mol% or more (preferably, based on all the constituent units derived from the monomer constituting the acrylic resin). (60 mol% or more). Examples of the monomer include (meth) acrylic acid and (meth) acrylic acid ester. In the present specification, the term “(meth) acryl” means that both acryl and methacryl are included, and the term “(meth) acrylate” means that both acrylate and methacrylate are included. means.

  Examples of the monomer constituting the acrylic resin in the acrylic resin emulsion include (meth) acrylic acid; methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, isopropyl (meth) acrylate, and n -Butyl (meth) acrylate, isobutyl (meth) acrylate, n-hexyl (meth) acrylate, n-octyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, cetyl (meth) acrylate, stearyl (meth) acrylate, and Alkyl (meth) acrylates such as cyclohexyl (meth) acrylate; 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate And hydroxyalkyl (meth) acrylates such as 4-hydroxybutyl (meth) acrylate; alkoxyalkyl (meth) acrylates such as 2-methoxyethyl (meth) acrylate and 2-ethoxyethyl (meth) acrylate; benzyl Aralkyl (meth) acrylates such as (meth) acrylate; aryl (meth) acrylates such as phenyl (meth) acrylate can be mentioned. One of these may be used alone, and preferably two or more can be used.

  As the aqueous medium contained in the resin emulsion, water is suitable, and only water may be used, or a mixed medium of water and an organic solvent may be used. Examples of the organic solvent include, but are not limited to, methanol, ethanol, isopropanol, ethyl carbitol, N-methylpyrrolidone, and the like. One or more organic solvents may be used.

  The solid content (evaporation residue) of the resin emulsion is preferably 5 to 60% by mass, more preferably 5 to 50% by mass, and 8 to 40% by mass when contained in the coating material composition. Is more preferable. The content of the resin emulsion solid content in the coating material composition is preferably from 5 to 50% by mass, more preferably from 7 to 40% by mass, based on the mass of the total solid content of the coating material composition. More preferably, it is 9 to 30% by mass.

  Further, the coating composition contains an alkali metal silicate. It is considered that when the coating material composition contains an alkali metal silicate, the alkali metal silicate reacts with the calcium component contained in the cement base material on the decorative surface of the cement cosmetic material. This makes it easy to color the exposed cement-based substrate on the decorative surface of the cement-based decorative material, and to easily maintain the appearance of the exposed decorative member on the decorative surface.

The alkali metal silicate can be represented by the general formula (1): M ₂ O · nSiO ₂ . In the general formula (1), M represents an alkali metal, and n represents a molar ratio of SiO ₂ / M ₂ O. Examples of the alkali metal include lithium, sodium, and potassium, and sodium and potassium are preferable, and sodium is more preferable. The molar ratio n is determined by {(SiO ₂ mass% / SiO ₂ formula weight) / (M ₂ O mass% / M ₂ O formula weight)}. The molar ratio n is preferably from 0.4 to 4.0, more preferably from 0.5 to 4.0, and still more preferably from 0.5 to 3.5. As the alkali metal silicate, it is preferable to use one or both of sodium silicate (Na ₂ O.nSiO ₂ ) and potassium silicate (K ₂ O.nSiO ₂ ). In addition, in this specification, sodium silicate may be described as sodium silicate.

  The form of the alkali metal silicate may be any of a solid such as a crystal, a powder, and a granule, and a solution. Examples of the solid alkali metal silicate include sodium orthosilicate having a molar ratio n in the range of 0.4 to 0.6 (molar ratio n ≒ 0.5) and a molar ratio n of 0.9 to 1 Crystalline sodium silicate such as sodium metasilicate (molar ratio n ≒ 1.0) in the range of 0.1; potassium metasilicate (molar ratio n ≒ 1.1) in the mole ratio n of 0.9 to 1.1. 0); and powdered sodium silicate obtained by dehydrating a sodium silicate solution.

  Examples of the alkali metal silicate in solution include a sodium silicate solution (aqueous sodium silicate solution) and a potassium silicate solution (aqueous potassium silicate solution). Examples of the sodium silicate solution include a sodium silicate solution having a molar ratio n in a range of 2.0 to 2.3, a sodium silicate solution having a molar ratio n in a range of 2.4 to 2.7, and a molar ratio n of A sodium silicate solution having a molar ratio n in the range of 3.3 to 3.5, a sodium silicate solution having a molar ratio n in the range of 3.3 to 3.5, and a molar ratio n in the range of 3.6 to 3.9. Sodium silicate solution and the like can be mentioned.

  Examples of the potassium silicate solution include a potassium silicate solution having a molar ratio n in the range of 1.8 to 2.2, a potassium silicate solution having a molar ratio n in the range of 2.5 to 2.7, and a molar ratio n of A potassium silicate solution in the range of 2.7 to 3.0, a potassium silicate solution in which the molar ratio n is in the range of 2.9 to 3.2, and a molar ratio n in the range of 3.4 to 3.7 Potassium silicate solution and the like can be mentioned. When potassium silicate is used as the alkali metal silicate, a potassium silicate solution having a molar ratio n in the range of 1.8 to 3.2 is preferable.

  One or more of the specific examples of the above-mentioned solid and solution-type alkali metal silicates can be used. Among them, solid sodium silicate is preferable, and the above-mentioned sodium metasilicate and powdered sodium silicate are more preferable. As the sodium metasilicate, any of a water salt and an anhydrous salt can be used. The molar ratio n of the powdered sodium silicate is preferably in the range of 2.0 to 3.5, more preferably in the range of 2.0 to 3.3, and more preferably in the range of 2.0 to 2.3. More preferably, it is within the range of 3.

The content (use amount) of the alkali metal silicate in the coating material composition is 5 parts by mass or more per 100 parts by mass of the solid content of the resin emulsion. The coating material composition, by containing the alkali metal silicate in the above specific amount, it is possible to satisfactorily color the cement-based substrate while maintaining the appearance of the decorative member among the decorative surfaces of the cement-based decorative material. It is possible to suppress color unevenness of the cement base material. From the viewpoint of enhancing such effects, the content (use amount) of the alkali metal silicate is preferably 7 parts by mass or more, more preferably 15 parts by mass or more, and more preferably 25 parts by mass or more. Is more preferable. The upper limit of the content of the alkali metal silicate is not particularly limited, but is preferably 950 parts by mass or less, more preferably 550 parts by mass or less, so that the alkali metal silicate is easily dissolved in the aqueous medium contained in the resin emulsion. More preferably, it is 300 parts by mass or less. The content of the above alkali metal silicate is the content as M ₂ O · nSiO ₂ , the ratio of alkali metal oxide (M ₂ O%) and the ratio of silicon dioxide (SiO ₂ %) in the alkali metal silicate. ) Can be obtained based on the total value.

  When sodium metasilicate is used as the alkali metal silicate, the content of sodium metasilicate in the coating material composition is preferably 5 to 250 parts by mass per 100 parts by mass of the solid content of the resin emulsion, and is 7 to 250 parts by mass. It is more preferable that the amount be from 15 to 150 parts by mass.

  When powdered sodium silicate is used as the alkali metal silicate, the content of the powdered sodium silicate in the coating material composition is preferably 25 to 950 parts by mass, preferably 25 to 550 parts by mass, per 100 parts by mass of the solid content of the resin emulsion. It is more preferable that the amount be from 30 to 550 parts by mass.

  When potassium silicate is used as the alkali metal silicate, the content of potassium silicate in the coating material composition is preferably 50 to 540 parts by mass, and more preferably 52 to 540 parts by mass per 100 parts by mass of the solid content of the resin emulsion. More preferably, it is more preferably 52 to 290 parts by mass.

The content of M ₂ O · nSiO ₂ in the alkali metal silicate in the coating material composition is preferably 1 to 80% by mass, based on the total solid content of the coating material composition, and is preferably 2 to 80% by mass. The content is more preferably 70% by mass, and even more preferably 5 to 50% by mass.

  The coating material composition preferably contains silica sand in addition to the coloring material, the resin emulsion, and the alkali metal silicate. Furthermore, the coating material composition may include one or more extenders such as calcium carbonate, barium sulfate, aluminum hydroxide, and talc, as necessary. When the coating material composition contains silica sand, or silica sand and an extender pigment, the cement base material on the decorative surface of the cement cosmetic material is given a matte appearance and has a good appearance. Further, when a coating film is formed by the coating material composition, the coating film can be provided with a non-slip (non-slip) performance, a crack prevention performance, a base hiding performance, and the like.

  When silica sand is used as a component of the coating material composition, the coating material composition preferably contains at least a powdery composition containing silica sand and a liquid composition containing at least the above-mentioned resin emulsion. In this case, the alkali metal silicate is preferably contained in at least one of the powdery composition and the liquid composition, may be contained in only one of them, or may be contained in both of them. May be. When a granular alkali metal silicate is used, the granular alkali metal silicate is preferably contained in a powdery composition, and when a solution-type alkali metal silicate is used, Preferably, the alkali metal silicate in the form of a solution is contained in the liquid composition. Further, the coloring material may be contained in only one of the powdery composition and the liquid composition, or may be contained in both of them. Is preferably contained in the powdery composition.

  The content of silica sand in the coating material composition is preferably from 10 to 80% by mass, more preferably from 20 to 70% by mass, and more preferably from 30 to 70% by mass, based on the mass of the total solid content of the coating material composition. It is more preferred that the content is 60 to 60% by mass.

  The coating material composition may contain other additives as necessary in addition to the above-described components. Other additives include, for example, plasticizers, defoamers, leveling agents, surfactants, thickeners, dispersants, anti-sagging agents, anti-settling agents, thixotropic agents, water retention agents, matting agents, anti-mold agents And preservatives.

<Production method of colored cement-based decorative material>
The method for producing a colored cement-based decorative material according to one embodiment of the present invention includes a step of applying a coating material composition to a decorative surface of a cement-based decorative material having a decorative surface in which a cement base and a decorative member are exposed. Including. Further, this manufacturing method is to wash off the coating material composition adhered to (contacted with and adhered to) the surface of the decorative member on the decorative surface to which the coating material composition has been applied, and to remove the cement base material on the decorative surface. Including a step of coloring. The coating material composition used in this production method contains a coloring material, a resin emulsion, and an alkali metal silicate, and the content of the alkali metal silicate is at least 5 parts by mass per 100 parts by mass of the solid content of the resin emulsion. Things. In this manufacturing method, the coating material composition according to the above-described embodiment can be suitably used.

  In the present specification, to distinguish the cement-based decorative material to which the coating material composition is provided from the colored cement-based decorative material obtained by the manufacturing method according to one embodiment of the present invention, it is described as “the decorative material main body”. May be. Further, in the present specification, in order to distinguish the cement-based decorative material obtained by the manufacturing method of one embodiment of the present invention from the cement-based decorative material to which the coating material composition is provided, the term “coloring” is used. In addition, it may be described as "colored cement-based decorative material". Hereinafter, a method for producing a colored cement-based decorative material will be described with reference to the drawings.

  FIGS. 1A to 1C and FIGS. 2A to 2C are diagrams for explaining a method of manufacturing the colored cement-based decorative materials 110 and 210 according to one embodiment of the present invention. FIGS. 1A to 1C show a decorative material having a decorative surface (finished surface of the above-described decorative aggregate layer) 11a in which a cement base material 12 and a beautiful aggregate 14 are exposed as a target to which the coating material composition 10 is applied. FIG. 3 is a diagram when a main body 11 is used. FIGS. 2A to 2C show a makeup to which the coating material composition 10 is applied, which has a decorative surface (the above-described tiled finished surface) 21a in which the cement-based substrate 22 (joint 22a) and the tile 24 are exposed. FIG. 3 is a diagram when a material main body 21 is used. Specifically, FIG. 1A and FIG. 2A are cross-sectional views schematically showing the decorative material main bodies 11 and 21 provided on the base 1. FIGS. 1B and 2B are cross-sectional views schematically illustrating a state where the coating material composition 10 is applied to the decorative surfaces 11a and 21a of the decorative material main bodies 11 and 21. 1C and FIG. 2C show that the coating material composition 10 attached to the surface of the decorative member (the beautiful aggregate 14 or the tile 24) on the decorative surfaces 11a and 21a to which the coating material composition 10 has been applied has been washed away. It is sectional drawing which represents a state typically. In FIG. 1C and FIG. 2C, in order to facilitate the description of the method of manufacturing the colored cement-based decorative materials 110 and 210, the coating material is applied to the exposed cement-based base materials 12 and 22a on the decorative surfaces 11a and 21a. The case where the coating film 100 is formed by the composition 10 will be exemplified.

  In the step of applying the coating material composition 10 to the decorative surfaces 11a and 21a of the decorative material main bodies 11 and 21, as shown in FIGS. 1B and 2B, the cement bases 12 and 22a and the decorative member on the decorative surfaces 11a and 21a The coating material composition 10 can be applied to the decorative surfaces 11a and 21a without distinction between 14 and 24. That is, in the decorative surfaces 11a and 21a, the portions colored by the coating material composition 10 are the portions of the cement-based substrates 12 and 22a (see FIGS. 1C and 2C). The coating material composition 10 can be applied to the entire decorative surfaces 11a and 21a in a region including the cement-based substrates 12 and 22a to be colored (see FIGS. 1B and 2B). For this reason, in this step, the cement composition is rubbed into the cement-based substrates 12, 22 (22a) of the exposed cement-based substrates 12, 22a and the decorative members 14, 24 on the decorative surfaces 11a, 21a. It can be easily performed as compared with the repair work performed by packing.

  The method for applying the coating material composition 10 to the decorative surfaces 11a and 21a is not particularly limited, and for example, a method such as brush application, roller application, and spray application can be employed. In the decorative surfaces 11a, 21a of the decorative material main bodies 11, 21, the surfaces of the decorative members 14, 24 are higher on the surface side than the surfaces of the cement-based substrates 12, 22 (22a) in the decorative surfaces 11a, 21a. (See FIGS. 1A and 2A). Even in such a case, it is preferable to apply the coating material composition 10 with a brush so that the coating material composition 10 can be applied well to the surfaces of the cement-based substrates 12 and 22 (22a).

The coating amount of the coating material composition 10 on the decorative surfaces 11a and 21a is preferably 100 to 1000 g (wet) / m ² in terms of the mass of the coating material composition 10 per unit area of the decorative surfaces 11a and 21a. , 150 to 800 g (wet) / m ² , more preferably 200 to 500 g (wet) / m ² .

  After applying the coating material composition 10 to the decorative surfaces 11a and 21a of the cosmetic material main bodies 11 and 21, the alkali metal silicate in the coating material composition 10 contains calcium components contained in the cement-based base materials 12 and 22. It is preferable to leave the coating material composition for a predetermined time so that it reacts sufficiently or that the coating material composition 10 sufficiently adheres to the cement-based substrates 12 and 22. The time is, for example, preferably 15 minutes to 24 hours, more preferably 0.5 to 6 hours, and more preferably 0.5 to 3 hours in an environment of normal temperature (20 ° C. ± 15 ° C.). Is more preferable.

  After performing the step of applying the coating material composition 10 to the decorative surfaces 11a and 21a of the decorative material main bodies 11 and 21, as shown in FIGS. 1C and 2C, the decorative surface 11a to which the coating material composition 10 has been applied. A step of washing off the coating material composition 10 adhered to the surfaces of the decorative members 14 and 24 in 21a and coloring the cement-based substrates 12 and 22a in the decorative surfaces 11a and 21a is performed. In this step, the coating material composition 10 applied to the decorative surfaces 11a, 21a of the decorative material main bodies 11, 21 adheres to the cement-based base materials 12, 22a of the decorative surfaces 11a, 21a. , The washing operation of the coating material composition 10 applied to the decorative surfaces 11a, 21a can be performed without distinction between the cement-based substrates 12, 22 and the decorative members 14, 24. This washing operation can be performed, for example, by rubbing with a sponge or cloth soaked in water, wiping it off, or rubbing it lightly with a scourer, a brush, or the like while running water. By such an operation, the coating material composition 10 adhered to the surfaces of the decorative members 14 and 24 on the decorative surfaces 11a and 21a can be removed.

  In the manufacturing method of the colored cementitious decorative materials 110 and 210 according to one embodiment of the present invention, the coating material composition is applied before the step of applying the coating material composition 10 to the decorative surfaces 11a and 21a of the decorative material main bodies 11 and 21. The method may include a step of manufacturing cosmetic material main bodies (cement-based decorative materials) 11 and 21 having decorative surfaces 11 and 21a to which 10 is applied. The process of producing the decorative material main bodies 11 and 21 can employ a known method. In this step, for example, it is preferable to obtain the decorative material main body 11 having the above-mentioned decorative aggregate layer finished surface 11a and the above-described decorative material main body 21 having the tiled finished surface 21a.

  As a step of obtaining the decorative material main body 21, for example, a cement composition for forming the cement-based base material 22 is applied to the substrate 1 with a trowel or the like to form a cement composition layer, and joints 22a are formed on the layer. A step of attaching a plurality of tiles 24 so as to be performed. By such a process, it is possible to obtain the decorative material main body 21 having the tiled finished surface 21a including the plurality of tiles 24 and the joint 22a of the cement-based substrate 22. In this step, a layer of the cement composition may be provided on the back surface of the tile 24.

  In addition, as a step of obtaining the decorative material main body 11, for example, a cement composition for forming the cement-based substrate 12 or a mixture containing the cement composition and a large number of beautiful aggregates 14 is applied to the substrate 1 with a trowel or the like. Then, a step of hardening the cement composition in a state where the surface of the many beautiful aggregates 14 is exposed and a part thereof is buried in the applied cement composition may be included. Further, as a step of obtaining the decorative material main body 11, for example, a mixture containing the cement composition and the beautiful aggregate 14 is applied to the substrate 1 with a trowel or the like, and a setting retarder is sprayed thereon, and then the cement other than the surface layer is dispersed. A step of curing the composition and washing out the uncured surface layer of the cement composition with water to remove the cement composition can also be mentioned. In addition, as a step of obtaining the decorative material main body 11, for example, a mixture containing the beautiful aggregate 14 and a resin binder is applied to the base 1 with a trowel or the like and cured, and then the cement composition is rubbed with a rubber trowel or lake. (Filling material) is applied to fill the space between the beautiful aggregates 14, and the cement composition covering the surface of the beautiful aggregate 14 is exposed so that the surface of the beautiful aggregate 14 is exposed when the cement composition is initially set. A step of scraping out with a rubber iron or the like or wiping off with a sponge or cloth soaked in water or the like may be included.

  Furthermore, before the process of producing the decorative material main bodies 11 and 21, a pretreatment process such as washing, drying, and primer application may be performed on the base 1 on which the decorative material main bodies 11 and 21 are provided. Good. Further, a step of obtaining a base (body) 1 such as mortar and concrete may be performed.

  According to the method for manufacturing the colored cement-based decorative materials 110 and 210 of one embodiment of the present invention, the appearance of the exposed decorative members 14 and 24 on the decorative surfaces 11a and 21a of the decorative material main bodies 11 and 21 can be easily performed. , The exposed cement-based substrates 12, 22 (22a) on the decorative surfaces 11a, 21a can be colored. Therefore, a cement-based decorative material (colored cement-based material) in which the unevenness and color change of the exposed cement-based substrates 12, 22 on the decorative surfaces 11a, 21a of the decorative-material main bodies 11, 21 due to efflorescence, deterioration, dirt, and the like are suppressed. Cosmetic materials 110 and 210) can be obtained.

  As described in detail above, by using the coating material composition according to one embodiment of the present invention, the exposed cement-based substrate on the decorative surface of the decorative material main body has white spots, deterioration, and color unevenness due to stains and the like. Color changes can be renewed. Also, from the beginning of the production of a cement-based decorative material, a cement-based decorative material having a design in which the exposed cement-based substrate on the decorative surface is colored differently from the cement-based color can be obtained.

The coating material composition according to one embodiment of the present invention can have the following configurations [1] to [9]. The method for producing a colored cement-based decorative material according to one embodiment of the present invention is as follows. The following configurations [10] to [12] can be adopted.
[1] A coating material composition used for a cement-based decorative material having a decorative surface on which a cement-based substrate and a decorative member are exposed, and for coloring the cement-based substrate on the decorative surface, a coloring material, a resin A coating material composition comprising an emulsion and an alkali metal silicate, wherein the content of the alkali metal silicate is 5 parts by mass or more per 100 parts by mass of the solid content of the resin emulsion.
[2] A powder composition containing at least silica sand, and a liquid composition containing at least the resin emulsion, wherein at least one of the powder composition and the liquid composition contains the alkali metal silicate. The coating material composition according to the above [1].
[3] The coating material composition according to the above [1] or [2], wherein the content of the alkali metal silicate is 5 to 950 parts by mass per 100 parts by mass of the solid content of the resin emulsion.
[4] The coating material composition according to any one of [1] to [3], wherein the alkali metal silicate contains at least one of sodium silicate and potassium silicate.
[5] The above-mentioned [1] to [4], wherein the alkali metal silicate contains sodium metasilicate, and the content of the sodium metasilicate is 5 to 250 parts by mass per 100 parts by mass of the solid content of the resin emulsion. ] The coating material composition according to any one of [1] to [10].
[6] The above [1] to [4], wherein the alkali metal silicate contains powdered sodium silicate, and the content of the powdered sodium silicate is 25 to 950 parts by mass per 100 parts by mass of the solid content of the resin emulsion. ] The coating material composition according to any one of [1] to [10].
[7] The above-mentioned [1] to [4], wherein the alkali metal silicate contains potassium silicate, and the content of the potassium silicate is 50 to 540 parts by mass per 100 parts by mass of the solid content of the resin emulsion. The coating material composition according to any one of the above.
[8] The coating material composition according to any one of [1] to [7], wherein the resin emulsion includes an acrylic resin emulsion.
[9] Any of the above-mentioned [1] to [8], wherein the decorative surface is a finished surface of a decorative aggregate layer containing a beautiful aggregate as the decorative member, or a tiled finished surface including a tile as the decorative member. The coating composition according to any one of the above.
[10] a step of applying a coating material composition to the decorative surface of a cement-based decorative material having a decorative surface in which a cement base material and a decorative member are exposed, and the decorative surface to which the coating material composition is applied Washing the coating material composition adhering to the surface of the decorative member in, and coloring the cement-based substrate on the decorative surface, the coating material composition is a coloring material, a resin emulsion, And a content of the alkali metal silicate is 5 parts by mass or more per 100 parts by mass of a solid content of the resin emulsion.
[11] The method for producing a colored cement-based decorative material according to the above [10], including a step of preparing the cement-based decorative material having the decorative surface before the step of applying the coating material composition.
[12] The method for producing a colored cementitious decorative material according to [10] or [11], wherein the coating material composition is the coating material composition according to any one of [1] to [9].

  Hereinafter, with reference to test examples, the coating material composition according to the above-described embodiment and a method for manufacturing a cement-based decorative material using the same will be described more specifically, but the present invention is limited by the following test examples. Not something. In the following description, “%” and “parts” are based on mass (“% by mass” and “parts by mass”, respectively) unless otherwise specified.

[Test Example A]
(Preparation of cement-based cosmetic material)
A commercially available concrete flat plate (300 mm × 300 mm × thickness 60 mm) was used as the substrate. A frame (28 cm × 28 cm = 784 cm ² ) is made on this substrate by using a backup material having a width of 10 mm and a height of 8 mm, and “color washing TX-604” (manufactured by Yabhara Sangyo Co., Ltd.) is formed in the frame in accordance with the construction instructions. Was constructed. After completion of the treatment, the composition is cured at 20 ° C. for 7 days or more, and has a decorative surface (a finished surface of the decorative aggregate layer) having a mortar layer as a cement base and a beautiful aggregate as a decorative member exposed. A material (decorative aggregate layer) was obtained.

(Preparation of coating material composition)
Each component was blended with the composition (unit: g) shown in the upper part of Table 1 (Tables 1-1 to 1-5) to prepare a coating material composition. In the middle part of the table, the coating amount (g / m ² ) of the coating material composition on the decorative surface of the cement-based decorative material, the solid content of the emulsion (g) in the coating material composition, and Na ₂ O · nSiO ₂ The amount (g) and the content (part) of Na ₂ O · nSiO ₂ per 100 parts of the solid content of the emulsion were shown. The following materials were used for the coating material composition.
・ Silica sand: Takeori silica sand 9 (particle size: 100 μm or less, manufactured by Takeori Mining Co., Ltd.)
Anhydrate metasilicate soda (Appearance: white powder, the molar _{ratio: 0.9~1.1, Na 2 O · nSiO} 2 content: 97.1%, manufactured by Nippon Chemical Industrial Co., Ltd.)
- powder sodium silicate No. 1 (Appearance: white powder, the molar _{ratio: 2.05~2.25, Na 2 O · nSiO} 2 content: 77.0%, manufactured by Nippon Chemical Industrial Co., Ltd.)
- powder sodium silicate No. 2 (Appearance: white powder, the molar _{ratio: 2.35~2.65, Na 2 O · nSiO} 2 content: 77.2%, manufactured by Nippon Chemical Industrial Co., Ltd.)
- powder sodium silicate No. 3 (Appearance: white powder, the molar _{ratio: 3.00~3.30, Na 2 O · nSiO} 2 content: 80.6%, manufactured by Nippon Chemical Industrial Co., Ltd.)
-Pigment (color: brown, trade name "Main Bayer tea (610)", sold by Yabu Harasha)
・ Antifoaming agent (Silicone antifoaming agent, trade name “KM-70”, manufactured by Shin-Etsu Chemical Co., Ltd.)
Emulsion A: n-butyl acrylate and methyl methacrylate copolymer emulsion (evaporation residue: 41.0-43.0%, viscosity: 500-1500 mPa · s / 25 ° C., pH 8.6-9.2, Tg : 17 ° C (calculated value), minimum film-forming temperature: 0 ° C or less, particle size: 0.10 µm or less) diluted with water to become “solid content in emulsion” shown in the middle row of the table. Emulsion B : Copolymer emulsion of 2-ethylhexyl acrylate and methyl methacrylate (evaporation residue: 48.0 to 50.0%, viscosity: 2500 to 5500 mPa · s / 25 ° C, pH 8.0 to 9.0, Tg: -9) ° C (calculated value), minimum film-forming temperature: 2 ° C, particle size: 0.11 µm) diluted with water so as to become “solid content in emulsion” shown in the middle row of the table.

(Production of colored cement-based decorative material)
A 140 mm × 140 mm frame was formed on the decorative surface of the cement-based decorative material (finished surface of the decorative aggregate layer) using a masking tape. In the frame, the prepared coating material composition was applied with a brush (hair length 32 mm, ball thickness 5 mm, width 24 mm, the same applies hereinafter) at the application amount shown in the middle row of Table 1, and the coating material composition was applied in a room at 20 ° C. for 3 hours. Left for hours. Then, lightly scrub and color from the top of the decorative surface to which the coating material composition has been applied, using water and a filter sponge (trade name: "Malt filter MF-13", manufactured by Inoac Corporation, the same applies hereinafter). A cement cosmetic material was obtained.

  The “coating condition” and “wiping condition” of the coating material composition in the process of obtaining the colored cement-based decorative material in this way, and the “finish condition” of the obtained colored cement-based decorative material were evaluated by the following method. . In the evaluation, in consideration of the fact that the “coating condition” can be improved by the additive or the like, the case where both “wiping condition” and “finish condition” were “A” or “B” was judged as acceptable. The lower part of Table 1 shows the evaluation results of Test Example A.

(Apply condition)
The application condition when the coating material composition was applied to the finished surface of the decorative aggregate layer was evaluated according to the following evaluation criteria.
A: It has moderate viscosity, has good coverage on the decorative aggregate layer and spreadability, and can be uniformly applied.
B: Although the viscosity was low, the coating and spreadability on the decorative aggregate layer were good, and the coating was uniform.
C: The viscosity was too high, the spreadability was poor, and uniform application was not possible.
D: The components were separated because the viscosity was too low, and could not be uniformly applied to the decorative aggregate layer.

(Wipe condition)
The filter sponge was slid vertically and horizontally with a certain force to extract the coating material composition applied to the finished surface of the decorative aggregate layer, and the degree of extraction was evaluated according to the following evaluation criteria.
A: The finished surface of the decorative aggregate layer could be easily wiped off.
B: There was resistance to the sliding operation of the filter sponge, and time was required for the wiping operation.
C: The filter sponge had a strong resistance to the sliding operation, and was difficult to wipe.
D: The coating material composition was wiped unevenly from the beautiful aggregate or hardly wiped off.

(Finish condition)
The finished state of the obtained colored cement-based decorative material was visually checked to evaluate according to the following evaluation criteria.
A: There was no unevenness in the exposure of the beautiful aggregate, and a beautiful finish and coloring of the mortar layer were obtained.
B: Although there was slight unevenness in the exposure of the beautiful aggregate, first of all, a beautiful finish and coloring of the mortar layer were obtained.
C: Spots appeared on the exposure of the beautiful aggregate, and a beautiful finish could not be obtained.
D: The beautiful aggregate could hardly be exposed, or the beautiful aggregate layer and the mortar layer could not be colored.

  From the results of Test Example A, a colored cement-based cosmetic material having good wiping condition and finish condition can be obtained by a coating material composition containing 5 parts or more of alkali metal silicate per 100 parts of solid content of the resin emulsion. Was. Therefore, the above-mentioned coating material composition maintains the appearance of the decorative member (beautiful aggregate) among the decorative surface (finished surface of the decorative aggregate layer) of the cement-based decorative material (decorative aggregate layer) while maintaining the appearance of the cement-based decorative material (beautiful aggregate). It was recognized that the substrate (mortar layer) could be colored to suppress color unevenness.

[Test Example B]
With respect to the coating material compositions 18, 19, and 20 used in Test Example A, a test was performed to confirm the abrasion resistance of the coating film using the coating material compositions.

As a substrate, a commercially available slate plate having a thickness of 3 mm was used after being cut into dimensions of 110 mm in width and 110 mm in length. A backup material having a width of 5 mm and a height of 3 mm was stuck on the substrate, and the reinforcing agent (special aqueous solution) obtained by the method disclosed in the example of JP-A-2008-38383 was placed in a frame of 10 cm × 10 cm = 100 cm ^2. Primer) with a 1.5 g (150 g / m ² ) brush. The kneaded material prepared by kneading the cement binder and water was laid down with a trowel and leveled to form a mortar layer having a coating thickness of 3 mm, and finished by brushing. The cement binder includes 33 parts of ordinary Portland cement gray, 67 parts of river sand (fine), 0.03 parts of water-soluble cellulose ether (trade name “Metroze 90SH-4000”, manufactured by Shin-Etsu Chemical Co., Ltd.), and water 22 53 g (5.3 kg / m ² ) of the cement composition consisting of 3 parts by weight. After the mortar layer was prepared, the mortar layer was allowed to stand and cure at 20 ° C. for 14 days or more. The prepared mortar layer was brush-coated with 4.2 g (420 g / m ² ) of the above-mentioned coating material composition to form a coating film. After being cured in a room at 20 ° C. for 7 days, an abrasion test was performed. Was. Further, as Comparative Reference Example B, a wear test was also performed on the mortar layer without applying the coating material composition. A Taber abrasion tester (manufactured by Toyo Seiki Seisaku-sho, Ltd.) was used for the abrasion test. The wear conditions were as follows: wear wheel: CS-17, speed: 60 rpm, number of rotations: 100, and load: 4.9 N / wheel (500 gf / wheel). Table 2 shows the results of Test Example B (wear test).

  From the results of Test Example B, the coating films of the coating material compositions 18, 19, and 20 all showed much less abrasion loss than the mortar layer of Reference Example B. Therefore, by forming a coating film of the coating material composition on the exposed cement-based substrate on the decorative surface of the cement-based decorative material, the wear resistance of the exposed cement-based substrate on the decorative surface is improved and deteriorated. It was confirmed that it was possible to contribute to the suppression of odor.

[Test Example C]
Next, a test and evaluation were performed in the same manner as in Test Example A, using a cement-based decorative material different from the cement-based decorative material used in Test Example A.

(Preparation of cement-based cosmetic material)
A commercially available concrete flat plate (300 mm × 300 mm × thickness 60 mm) was used as the substrate. On this substrate, a frame (28 cm × 28 cm = 784 cm ² ) having a width of 10 mm and a height of 10 mm was formed, and in the frame, the reinforcement obtained by the method disclosed in the example of JP-A-2008-38383. The agent (special aqueous primer) was applied with a 11.8 g (150 g / m ² ) brush. The kneaded material prepared by kneading the cement binder and water is laid down with a trowel and leveled to form a mortar layer of 784 cm ² with a thickness of 7 mm, and a plurality of beautiful aggregates are arranged on the mortar layer. Averaged and embedded. Two hours later, the surface mortar layer is removed with a plaster brush to expose the beautiful aggregate, and the decorative surface (the decorative aggregate layer) in which the mortar layer as the cement base material and the beautiful aggregate as the decorative member are exposed (Finished surface) was obtained. At this time, 870 g (11.1 kg / m ² ) of Oiso single grain with a major axis of 8 to 10 mm (trisparite) was used as the beautiful aggregate. The cement binder includes 33 parts of ordinary Portland cement gray, 67 parts of river sand (fine), 0.03 parts of water-soluble cellulose ether (trade name “Metroze 90SH-4000”, manufactured by Shin-Etsu Chemical Co., Ltd.), and water 22 990 g (12.7 kg / m ² ) of the cement composition comprising A cosmetic aggregate layer was prepared and cured at 20 ° C. for 7 days or more.

(Preparation of coating material composition)
Each component was blended with the composition (unit: g) shown in the upper part of Table 3 below to prepare a coating material composition. In the middle part of the table, items similar to those in Table 1 described above are shown. In addition, the same components as those of the coating material composition used in Test Example A were used for the components of the coating material composition used in Test Example C.

(Production of colored cement-based decorative material)
A 9.3 cm × 28 cm２８260 cm ² frame was formed on the decorative surface of the cement-based decorative material with a masking tape. In the frame, 7.8 g (300 g / m ² ) of the prepared coating material composition was applied with a brush, and left in a room at 20 ° C. for 3 hours. Thereafter, the surface of the decorative surface to which the coating material composition was applied was lightly rubbed and washed with water and a filter sponge to obtain a colored cement-based decorative material.

  The "coating condition" and "wiping condition" of the coating material composition in the process of obtaining the colored cement-based decorative material in this way, and the "finish condition" of the obtained colored cement-based decorative material were evaluated by the above-described method. . The lower part of Table 3 shows the evaluation results of Test Example C.

  From the results of Test Example C, the cement-based decorative material prepared in Test Example C was also wiped and finished with a coating material composition containing at least 5 parts of an alkali metal silicate per 100 parts of the solid content of the resin emulsion. A colored cement-based decorative material having a good condition was obtained. Therefore, even with the cement-based decorative material produced in Test Example C, the cement-based substrate (mortar layer) was colored by the above-mentioned coating material composition while maintaining the appearance of the decorative member (beautiful aggregate). Was found to be possible.

[Test Example D]
For the coating material composition 41 used in Test Example C6, a test (accelerated weather resistance test) for confirming the weather resistance of a coating film using the coating material composition was performed.

As a cement-based substrate, a kneaded material prepared by kneading a cement binder and water into a 45 mm × 150 mm × 12 mm thick formwork is laid down with a trowel, and allowed to stand in a room at 20 ° C. for 14 days or more. What was used was used. The cement binder is composed of 28.5 parts of ordinary Portland cement gray, 71.5 parts of river sand (fine), 0.03 parts of water-soluble cellulose ether (trade name "Metroze 90SH-4000"), and 11.1 parts of water. A cement base material was brush-coated with 2 g (about 300 g / m ² ) of the coating material composition 41 on a cement base material, left standing in a room at 20 ° C. for 24 hours, and then using water and a filter sponge. It was lightly scrubbed, and then left to stand in a room at 20 ° C. for 14 days, and used for evaluation, and similarly, one in which each of the above curing temperatures of “20 ° C.” was set to “5 ° C.” was also evaluated. Used for Further, as Reference Example D for comparison, a test was performed in the same manner except that a commercially available coating material (trade name “Paint Cleat”, manufactured by Ashford Japan Co., Ltd.) was used instead of the coating material composition. For the accelerated weather resistance test, a super-accelerated weather resistance tester (trade name “I-Super UV Tester SUV-W261”, manufactured by Iwasaki Electric Co., Ltd.) was used. The conditions of the weather resistance test were: irradiation illuminance: UV intensity 150 mW / cm ² (illuminometer: UVP-365-03), (1) irradiation: 63 ° C./humidity 50% for 6 hours, (2) rest: 35 ° C. / A pure water shower was performed for 10 seconds before and after (2) at a humidity of 90% for 2 hours, and (1) and (2) were defined as one cycle, and 20 cycles were performed.

The degree of deterioration by the accelerated weather resistance test was visually confirmed, and the weather resistance was evaluated on a scale of 1 to 5 in accordance with the following evaluation criteria. Table 4 shows the results of Test Example D.
5: Same and clean finish as before the test and coloring remained in the mortar layer.
4: A fairly clean finish remained, and coloring remained in the mortar layer.
3: The coloring of the mortar layer disappeared, and the coloring appeared light.
2: The coloring of the mortar layer was thin overall.
1: Almost no coloring of the mortar layer.

  From the results of Test Example D, it was confirmed that a coating film having good weather resistance was obtained by the coating material composition.

[Test Example E]
As a base material, a glazed porcelain tile of 97 mm x 97 mm x 5 mm on a slate flat plate (300 mm x 300 mm x 6 mm thick) is coated with a base adjustment coating material (trade name "Cation tight F" (Manufactured by Hara Sangyo Co., Ltd.). The base adjustment coating material (Cation tight F) used herein was kneaded at a ratio of 100 parts of the main material (powder) and 22 parts of the hardening liquid. I painted. The joints of the gaps between the porcelain tiles were finished using cement-based tile jointing materials (trade name “Tailon for Pacific joints (for general use)” manufactured by Taiheiyo Materials Corporation). It was allowed to stand in a room at 20 ° C. for 7 days or more to obtain a cement-based decorative material having a joint surface as a cement-based substrate and a decorative surface (tile-finished surface) in which a porcelain tile as a decorative member was exposed.

(Preparation of coating material composition)
Each component was blended with the composition (unit: g) shown in the upper part of Table 5 (Table 5-1 and Table 5-2) to prepare a coating material composition. In the middle part of the table, the coating amount (g / m ² ) of the coating material composition on the decorative surface of the cement-based decorative material, the solid content of the emulsion (g) in the coating material composition, and K ₂ O · nSiO ₂ The amount (g) and the content (parts) of K ₂ O · nSiO ₂ per 100 parts of the solid content of the emulsion were shown. The following potassium silicate solution was used for the coating material composition. The other materials (silica sand, pigment, defoamer, and emulsion A) were the same as those used in Test Example A.
· 1K potassium silicate (Appearance: colorless to slightly colored liquid, the molar _{ratio: 1.8~2.2, K 2 O · nSiO} 2 content: 50.0%, manufactured by Nippon Chemical Industrial Co., Ltd.)
· A potassium silicate (Appearance: colorless to slightly colored liquid, the molar _{ratio: 2.9~3.2, K 2 O · nSiO} 2 content 40.3%, manufactured by Nippon Chemical Industrial Co., Ltd.)

(Production of colored cement-based decorative material)
The prepared coating material composition was applied to a region including a joint portion of a decorative surface (tile-finished surface) of the cement decorative material with a coating amount shown in the middle part of Table 5 with a brush. At this time, the coating material composition also adhered to the joint portion side edge portion of the porcelain tile with a width of about 10 mm. It was left in a room at 20 ° C. for 3 hours. Then, it was lightly scrubbed with water and a filter sponge from the area including the joint portion of the tiled finished surface to which the coating material composition was applied, to obtain a colored cement-based decorative material.

  The "coating condition" and "wiping condition" of the coating material composition in the process of obtaining the colored cement-based decorative material in this way, and the "finish condition" of the obtained colored cement-based decorative material were evaluated by the above-described method. . The lower part of Table 5 shows the evaluation results of Test Example E.

  From the results of Test Example E, the wiping condition and the finish condition were excellent even when a tiled finished surface was used as a decorative surface of the cement-based decorative material and a coating material composition containing potassium silicate as an alkali metal silicate was used. In both cases, good colored cement-based decorative materials were obtained. Therefore, it was recognized that the coating material composition can color the cement-based substrate (joint portion) and suppress color unevenness while maintaining the appearance of the decorative member (porcelain tile).

DESCRIPTION OF SYMBOLS 1 Substrate 10 Coating material composition 11, 21 Cosmetic material main body 11a Finished surface of decorative aggregate layer 21a Tile-finished surface 12, 22 Cement-based substrate 22a Joint 14 Beautiful aggregate 24 Tile 100 Coating film 110 Colored cement-based cosmetic material 210 Colored cement-based cosmetic material

Claims (11)

Used in a cement-based decorative material having a decorative surface in which a cement-based substrate and a decorative member are exposed, a coating material composition for coloring the cement-based substrate in the decorative surface,
Contains coloring materials, resin emulsions, and alkali metal silicates,
The coating material composition, wherein the content of the alkali metal silicate is 5 parts by mass or more per 100 parts by mass of the solid content of the resin emulsion. A powdery composition containing at least silica sand,
A liquid composition containing at least the resin emulsion,
The coating material composition according to claim 1, wherein at least one of the powdery composition and the liquid composition contains the alkali metal silicate.   The coating material composition according to claim 1 or 2, wherein the content of the alkali metal silicate is 5 to 950 parts by mass per 100 parts by mass of the solid content of the resin emulsion.   The coating material composition according to any one of claims 1 to 3, wherein the alkali metal silicate contains at least one of sodium silicate and potassium silicate. The alkali metal silicate includes sodium metasilicate,
The coating material composition according to any one of claims 1 to 4, wherein the content of the sodium metasilicate is 5 to 250 parts by mass per 100 parts by mass of the solid content of the resin emulsion. The alkali metal silicate includes powdered sodium silicate,
The coating material composition according to any one of claims 1 to 4, wherein the content of the powdery sodium silicate is 25 to 950 parts by mass per 100 parts by mass of the solid content of the resin emulsion. The alkali metal silicate includes potassium silicate,
The coating material composition according to any one of claims 1 to 4, wherein the content of the potassium silicate is 50 to 540 parts by mass per 100 parts by mass of the solid content of the resin emulsion.   The coating material composition according to any one of claims 1 to 7, wherein the resin emulsion includes an acrylic resin emulsion.   The coating according to any one of claims 1 to 8, wherein the decorative surface is a finished surface of a decorative aggregate layer including beautiful aggregate as the decorative member, or a tiled finished surface including tile as the decorative member. Material composition. A step of applying a coating material composition to the decorative surface of the cement-based decorative material having a decorative surface in which the cement-based substrate and the decorative member are exposed,
Washing the coating material composition adhering to the surface of the decorative member on the decorative surface to which the coating material composition has been applied, and coloring the cement-based substrate on the decorative surface,
The coating material composition includes a coloring material, a resin emulsion, and an alkali metal silicate, and the content of the alkali metal silicate is 5 parts by mass or more per 100 parts by mass of a solid content of the resin emulsion. Manufacturing method of cement-based decorative material.   The method for producing a colored cement-based decorative material according to claim 10, comprising a step of preparing the cement-based decorative material having the decorative surface before the step of applying the coating material composition.

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