Ceramic housing material and method for manufacturing the same

Abstract

To provide a ceramic housing material that is equipped with glossy finish having matte and sense of luxury and has suppressed unnatural and uneven finish even in the case where a layer of black-based monochrome is formed on a ceramic substrate having the pattern depth of 1.5 mm or less, and a method for manufacturing the material.SOLUTION: A ceramic housing material 10 of black-based monochrome comprises a ceramic substrate 1, a sealer layer 2 formed on the ceramic substrate 1, and a top coat layer 4 formed on the sealer layer 2, the top coat layer 4 includes silica sands 3 having the particle size of No.6 or more and No.8 or less, and the content per unit area of the silica sand 3 in the ceramic housing material 10 is 30 g / m2 or more and less than 130 g / m2.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a ceramic building material and a method for producing the same. [Background technology]

[0002] Ceramic building materials using ceramic substrates have been widely used as exterior materials for buildings. Ceramic building materials are, for example, laminates in which a sealer layer, an undercoat layer, a colored layer, and a clear layer are formed in this order on at least one surface of a ceramic substrate (see, for example, Patent Documents 1 and 2).

[0003] When the layers constituting a ceramic building material are formed only with paint, the glossiness (shininess) can be too strong, resulting in a lack of a luxurious feel. Therefore, beads or sand have been incorporated into any of the layers constituting the ceramic building material to impart a matte finish to the ceramic building material, resulting in a luxurious glossiness. In particular, when sand is incorporated, it is possible to impart a textured feel due to the unevenness in addition to the matte, luxurious glossiness.

[0004] By the way, ceramic building materials with various colors can be obtained depending on the type of pigments contained in the paint, etc. However, in the case of ceramic building materials with a single black color, it is known that the apparent color changes significantly depending on how the light hits it, which is a characteristic of black.

[0005] For this reason, even in the case of a ceramic substrate with a flat pattern with a pattern depth of 1.5 mm or less, ceramic building materials with a layer of a single black color (black monotone) containing sand formed on them may not be able to achieve a matte, luxurious gloss (luster) due to the particle size of the sand and variations in the sand within the layer, and an unnatural unevenness may be seen in the appearance of the finished product. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 2019-171836 [Patent Document 2] Japanese Patent Application Laid-Open No. 2005-238075 Summary of the Invention [Problem to be solved by the invention]

[0007] The present invention has been made in view of the above-mentioned background art, and aims to provide a ceramic building material and a manufacturing method thereof that has a matte, luxurious glossy feel and suppresses unnatural unevenness, even when a black monotone layer is formed on a ceramic substrate with a pattern depth of 1.5 mm or less. [Means for solving the problem]

[0008] The present inventors have conducted extensive research to achieve the above object, and have discovered that even when a monochromatic black layer is formed on a ceramic substrate having a pattern depth of 1.5 mm or less, by using silica sand of a specific size range and in a specific content range, a matte, luxurious gloss can be obtained and unnatural unevenness can be suppressed, leading to the completion of the present invention.

[0009] That is, the present invention provides a black-based monochromatic ceramic building material comprising a ceramic substrate, a sealer layer formed on the ceramic substrate, and a top coat layer formed on the sealer layer, wherein the top coat layer contains silica sand having a particle size of no. 6 or more and no. 8 or less, and the content of the silica sand per unit area in the ceramic building material is 30 g / m 2 More than 130g / m 2 To provide a ceramic building material that is less than

[0010] The present invention also provides a method for manufacturing a ceramic substrate, the method comprising the steps of: a sealer coating step of coating a ceramic substrate with a sealer coating to form a wet sealer layer; a silica sand scattering step of scattering silica sand having a particle size of no. 6 or more and no. 8 or less on the wet sealer layer; a sealer layer drying step of drying the wet sealer layer on which the silica sand has been scattered to form a sealer layer in which the silica sand is fixed; a top coat coating step of coating a black single-color top coat paint on the sealer layer to form a wet top coat layer; and a top coat layer drying step of drying the wet top coat layer to form a top coat layer, wherein in the silica sand scattering step, the amount of silica sand scattered per unit area is set to 30 g / m. 2 More than 130g / m 2 The present invention provides a method for manufacturing a ceramic building material in which the thickness is less than 1 / 2 mm. [Effects of the Invention]

[0011] According to the present invention, it is possible to provide a ceramic building material and a manufacturing method thereof that has a matte, luxurious glossy finish and suppresses unnatural unevenness, even when a monochromatic black layer is formed on a ceramic substrate with a pattern depth of 1.5 mm or less. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a cross-sectional schematic diagram of a ceramic building material according to one embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, one embodiment of the present invention will be described in detail.

[0014] The ceramic building material of this embodiment is a black monotone building board made by applying paint to a ceramic substrate, and is used, for example, as an exterior wall material for a building. The ceramic building material of this embodiment is a ceramic building material with a black monotone layer formed thereon, but it has a matte, luxurious gloss (color and luster) and suppresses unnatural unevenness in the exterior appearance after construction.

[0015] The ceramic building material of this embodiment has a lightness L *A value of less than 40 is preferred. * The excellent effects of this embodiment are also fully exhibited in black ceramic building materials that satisfy a value of <40.

[0016] [Ceramic building materials] The ceramic building material of this embodiment has a sealer layer and a topcoat layer, in this order, on at least one surface of a ceramic substrate. That is, the ceramic building material of this embodiment essentially comprises a ceramic substrate, a sealer layer formed on the ceramic substrate, and a topcoat layer formed on the sealer layer.

[0017] The structure of the ceramic building material of this embodiment will be described with reference to the drawings. FIG. 1 is a schematic cross-sectional view of a ceramic building material 10 according to this embodiment. The ceramic building material 10 according to this embodiment has a monochromatic black appearance and includes a sealer layer 2 on the surface of a ceramic substrate 1. Silica sand 3 is fixed to the sealer layer 2, and a topcoat layer 4 containing the silica sand 3 is formed on the surface of the sealer layer 2. As shown in FIG. 1, at least a portion of each particle of the silica sand 3 protrudes from the surface of the topcoat layer 4, and the silica sand 3 is contained within the topcoat layer 4, with the contours of the silica sand 3 forming multiple convex portions on the surface of the topcoat layer 4. That is, in the ceramic building material 10, the diameter of the silica sand 3 is larger than the thickness of the topcoat layer 4. Furthermore, in the ceramic building material 10 according to this embodiment, a clear layer 5 is formed on the surface of the topcoat layer 4 as an optional layer.

[0018] <Black pigments> The ceramic building material 10 of this embodiment has a black monotone color. The black pigment for expressing the black monotone color may be contained in either or both of the sealer layer 2 and the topcoat layer 4.

[0019] In particular, it is preferable that a black pigment is blended into the topcoat paint for forming the topcoat layer 4, and that the black pigment is contained in the topcoat layer 4. In this case, preferably according to the manufacturing method of the ceramic building material according to the present embodiment described below, silica sand 3 is scattered on the undried sealer layer and dried, the silica sand 3 is fixed to the sealer layer 2, and then a topcoat paint containing a black pigment is applied to the sealer layer 2 to which the silica sand 3 is fixed, thereby obtaining a ceramic building material 10 whose entire surface is colored monochromatically in black.

[0020] The black pigment used in this embodiment is not particularly limited. Any conventionally known black pigment used in black ceramic building materials can be appropriately selected and used. Specific examples of black pigments include carbon blacks such as furnace black, lamp black, acetylene black, and channel black; organic pigments such as aniline black; and inorganic pigments such as black iron oxide.

[0021] <Ceramic substrate> The ceramic substrate 1 used in the ceramic building material 10 of this embodiment is not particularly limited and can be a conventionally known material. For example, a conventionally known ceramic siding material can be used. The ceramic siding material is formed from a material primarily composed of cement. The ceramic siding material is produced, for example, by blending an inorganic filler, a fibrous material, etc. with a hydraulic adhesive material, molding the mixture, and then curing and hardening it. The hydraulic adhesive material is not particularly limited and can be one or more cement materials such as Portland cement and blast furnace cement. The cement material can also be mixed with one or more types of blast furnace slag, calcium silicate, gypsum, etc. Inorganic fillers can include fly ash, microsilica, silica sand, etc. Fibrous materials can include pulp, synthetic fibers, inorganic fibers, and metal fibers such as steel fibers, either alone or in combination.

[0022] The ceramic substrate 1 used in this embodiment preferably has a pattern depth of 1.5 mm or less. Furthermore, the maximum pattern depth is preferably 1.5 mm or less. A pattern depth of 1.5 mm or less is called a flat pattern, and includes a pattern depth of 0 mm. In this embodiment, even when a ceramic substrate 1 with a flat pattern having a pattern depth of 1.5 mm or less is used, a ceramic building material 10 with a matte, luxurious gloss and a monochromatic black color with reduced unnatural unevenness in the appearance after application is obtained.

[0023] The bulk density of the ceramic substrate 1 used in this embodiment is not particularly limited, and a substrate having a bulk density within a conventionally known range can be used. From the viewpoints of lightness, mechanical strength, and workability, the bulk density of the ceramic substrate 1 is, for example, in the range of 0.9 to 1.2.

[0024] The thickness of the ceramic substrate 1 used in this embodiment is not particularly limited, and a thickness within a conventionally known range can be used. From the viewpoints of impact resistance, lightness, and workability, the thickness of the ceramic substrate 1 is, for example, in the range of 12 mm to 18 mm.

[0025] <Sealer layer> The sealer layer 2 of this embodiment is formed on the surface of the ceramic substrate 1. The sealer layer 2 is disposed to strengthen the surface of the ceramic substrate 1, prevent alkali elution from the ceramic substrate 1, and improve adhesion with the topcoat layer 4. The sealer layer 2 of this embodiment also serves to fix the silica sand 3 to the surface.

[0026] The paint for forming the sealer layer 2 is not particularly limited, and any conventionally known sealer paint can be used. The sealer paint for forming the sealer layer 2 may be either a water-based sealer paint or a solvent-based sealer paint. Examples of the resin type of the sealer paint include acrylic, acrylic emulsion, epoxy, urethane, and polyisocyanate types.

[0027] Among these, from the viewpoint of addressing environmental issues, a water-based acrylic silicone emulsion resin paint is preferably used. The sealer layer 2 of this embodiment may or may not contain a pigment. Furthermore, the sealer layer 2 may contain various additives such as antioxidants, light stabilizers, plasticizers, and sensitizers, as long as the effects of this embodiment are not impaired.

[0028] Although the thickness of the sealer layer 2 in this embodiment is not particularly limited, it is preferably greater than 30 μm. When the thickness of the sealer layer 2 is greater than 30 μm, the surface of the ceramic substrate 1 can be strengthened, and the adhesion to the topcoat layer 4 can be further improved, and the silica sand 3 can be more firmly fixed.

[0029] <Topcoat layer> The topcoat layer 4 of this embodiment is formed on the sealer layer 2. The topcoat layer 4 is placed on the sealer layer 2 while enclosing the silica sand 3 fixed on the sealer layer 2. In order to impart an uneven texture to the surface of the ceramic building material 10 of this embodiment, it is preferable that the upper part of the silica sand 3 protrudes from the surface of the topcoat layer 4. By having the upper part of the silica sand 3 protrude from the surface of the topcoat layer 4, multiple convex portions derived from the outer shape of the silica sand 3 can be formed on the surface of the ceramic building material 10, resulting in an uneven matte appearance.

[0030] The topcoat paint used to form the topcoat layer 4 is not particularly limited, and any conventionally known paint can be appropriately selected and used. In this embodiment, any type of topcoat paint can be used, such as a solvent-based paint, a water-soluble paint, an emulsion (water-dispersible) paint, or a powder paint. Examples of resin-based topcoat paints include acrylic resins, acrylic silicone resins, epoxy resins, polyisocyanate resins, urethane resins, silicone resins, fluororesins, vinyl chloride resins, and phthalic acid resins.

[0031] Among these, from the viewpoint of addressing environmental issues, water-based acrylic silicone emulsion resin paints are preferably used. The topcoat layer 4 may contain additives, etc., as needed. The additives are not particularly limited, and conventionally known additives can be used. Examples of additives include matting agents such as silica and alumina, antifoaming agents, leveling agents, anti-sagging agents, surface conditioners, viscosity adjusters, dispersants, UV absorbers, waxes, etc.

[0032] The silica sand 3 contained in the top coat layer 4 is not particularly limited, and general silica sand can be used. That is, the silica sand 3 used in this embodiment is sand containing SiO as a main component and AlO, FeO, KO, NaO, etc. as trace components.

[0033] The silica sand 3 used in this embodiment has a particle size of No. 6 to No. 8. When the particle size of the silica sand 3 is within this range and the content of the silica sand 3 is within the range described below, even when a black monochromatic ceramic substrate 1 having a flat pattern with a pattern depth of 1.5 mm or less is used, a ceramic building material 10 is obtained that has a matte, luxurious gloss and suppresses unnatural unevenness in the appearance after application.

[0034] The silica sand 3 used in this embodiment is particularly preferably one having a particle size of No. 7. By using silica sand 3 having a particle size of No. 7, it is possible to achieve a higher level of expression of a matte, luxurious gloss and suppression of unnatural unevenness.

[0035] In the ceramic building material 10 of this embodiment, the content of silica sand 3 per unit area is 30 g / m 2 More than 130g / m 2 The silica sand 3 content is less than 30 g / m 2 More than 130g / m 2 At the same time, since the particle size of the silica sand 3 is No. 6 to No. 8, even when a black monochromatic ceramic substrate 1 having a flat pattern with a pattern depth of 1.5 mm or less is used, a ceramic building material 10 can be obtained that has a matte, luxurious gloss and suppresses unnatural unevenness in the appearance after application.

[0036] In the ceramic building material 10 of this embodiment, the content of silica sand 3 per unit area is 30 g / m 2 or more, and 2 may be 50 g / m or more, 2 or more, and 2 On the other hand, the content of the silica sand 3 per unit area is 120 g / m or more. 2 or less, and 2 may be less than 100 g / m 2 may be less than 90 g / m 2 may be less than 80 g / m 2 may be less than 70 g / m 2 It may be the following:

[0037] In this embodiment, by providing irregularities on the surface of the ceramic building material 10, it is possible to give it a matte, luxurious gloss, and in addition, it is preferable that the upper part of the silica sand 3 protrudes from the surface of the topcoat layer 4 in order to give it a tactile feel due to the irregularities.

[0038] In order to ensure that the upper part of the silica sand 3 protrudes from the surface of the top coat layer 4, the thickness of the top coat layer 4 is preferably smaller than the diameter of the silica sand 3. In order to ensure that the thickness of the top coat layer 4 is smaller than the diameter of the silica sand 3, the thickness of the top coat layer 4 is preferably 10 μm or more and 50 μm or less. If the thickness of the top coat layer 4 is 10 μm or more and 50 μm or less, it is possible to achieve a higher level of expression of a matte, luxurious gloss and suppression of unnatural unevenness.

[0039] The topcoat layer 4 of this embodiment preferably contains the above-mentioned black pigment. When the topcoat paint for forming the topcoat layer 4 contains a black pigment, after the silica sand 3 is fixed to the sealer layer 2, a coating of the topcoat paint is formed on the sealer layer 2 and the silica sand 3, so that the ceramic building material 10 whose entire surface is colored in a single black color can be obtained.

[0040] <Clear layer> The ceramic building material 10 of this embodiment only needs to include the ceramic substrate 1, the sealer layer 2, and the topcoat layer 4 in this order, and may also include other optional layers. The optional layers may be disposed between or on the outside of the laminate including the ceramic substrate 1, the sealer layer 2, and the topcoat layer 4. Specifically, the ceramic building material 10 of this embodiment may further include a clear layer 5 on the laminate including the ceramic substrate 1, the sealer layer 2, and the topcoat layer 4. The provision of the clear layer 5 imparts functionality such as weather resistance to the black-based single-color ceramic building material 10, and can further reduce unnatural unevenness in the appearance of the finished product compared to a product without the clear layer 5.

[0041] The clear coating material for forming the clear layer 5 is not particularly limited, and any clear coating material known in the art for use as a clear layer for ceramic building materials can be used. In this embodiment, any type of clear coating material can be used, such as a solvent-based coating material, a water-soluble coating material, an emulsion (water-dispersible) coating material, or a powder coating material. Examples of resin-based clear coating materials include acrylic resins, alkyd resins, polyester resins, silicone-modified polyester resins, silicone-modified acrylic resins, epoxy resins, polycarbonate resins, silicate resins, fluororesins, chlorine resins, and polyolefin resins.

[0042] Among these, from the viewpoint of addressing environmental issues, a water-based acrylic silicone emulsion resin paint is preferably used. The clear coat 5 may contain additives, etc., as needed. The additives are not particularly limited, and conventionally known additives can be used. Examples of additives include matting agents such as silica and alumina, antifoaming agents, leveling agents, anti-sagging agents, surface conditioners, viscosity adjusters, dispersants, ultraviolet absorbers, waxes, etc.

[0043] The thickness of the clear coat layer 5 is not particularly limited, but is preferably 10 μm or more and 30 μm or less. If the thickness of the clear coat layer 5 is within this range, it is possible to impart functionality such as weather resistance to the black-based single-color ceramic building material 10 and further suppress unnatural unevenness in the appearance of the finished product.

[0044] [Manufacturing methods for ceramic building materials] The method for manufacturing the ceramic building material 10 of this embodiment is not particularly limited, but may include, for example, a manufacturing method including a sealer paint application process, a silica sand scattering process, a sealer layer drying process, a topcoat paint application process, and a topcoat layer drying process.

[0045] <Sealer paint application process> The sealer coating step is a step of coating a ceramic substrate 1 with a sealer coating to form an undried sealer layer. A ceramic substrate 1 with a pattern depth of 1.5 mm or less is preferably used. The sealer coating may be any of the above-mentioned sealer coatings. The method for applying the sealer coating is not particularly limited, and conventionally known methods may be used. Examples of methods for applying the sealer coating include coating methods using a roll coater, a flow coater, and a sprayer. The sealer coating is preferably applied by these coating methods so that the thickness of the sealer layer 2 is greater than 30 μm.

[0046] In the sealer coating process, it is preferable that the thickness of the wet sealer layer be greater than 30 μm. By making the thickness of the sealer layer greater than 30 μm, the surface of the ceramic substrate 1 can be strengthened and adhesion with the topcoat layer 4 can be further improved. At the same time, the silica sand 3 that is scattered on the sealer layer 2 in the silica sand scattering process described below can be firmly fixed by the sealer layer 2.

[0047] <Silica sand spreading process> The silica sand scattering process is a process of scattering silica sand 3 onto the undried sealer layer formed in the sealer coating process. In the silica sand scattering process, after the sealer coating has been applied in the sealer coating process described above, and before the sealer coating has dried, a predetermined amount of silica sand 3 is scattered.

[0048] To obtain the ceramic building material 10 of this embodiment, it is necessary to spread silica sand 3 of a specific particle size in a specific amount. Specifically, silica sand 3 with particle sizes of No. 6 to No. 8 is used, and the amount of silica sand 3 spread is 30 g / m. 2More than 130g / m 2 As a result, the resulting black-based monochromatic ceramic building material 10 has a matte, luxurious glossy finish and suppresses unnatural unevenness in the appearance of the finished product, even when using a ceramic substrate 1 having a flat pattern with a pattern depth of 1.5 mm or less.

[0049] The particle size of the silica sand 3 is particularly preferably No. 7. The silica sand 3 having a particle size of No. 7 can exhibit the above-mentioned effects at a higher level. In addition, the amount of silica sand 3 to be spread per unit area is 30 g / m. 2 or more, and 2 may be 50 g / m or more, 2 or more, and 2 On the other hand, the amount of silica sand 3 scattered per unit area is 120 g / m 2 or less, and 2 may be less than 100 g / m 2 may be less than 90 g / m 2 may be less than 80 g / m 2 may be less than 70 g / m 2 It may be the following:

[0050] There are no particular limitations on the method for scattering the silica sand 3, and any conventionally known method can be used. Examples of the method for scattering the silica sand 3 include a method using a sand spreader.

[0051] <Sealer layer drying process> The sealer layer drying step is a step of drying the undried sealer layer onto which the silica sand 3 has been scattered in the silica sand scattering step, to form a sealer layer 2 onto which the silica sand 3 has been fixed. That is, by drying the undried sealer layer onto which the silica sand 3 has been scattered, a sealer layer 2 onto which the silica sand 3 has been fixed is formed.

[0052] The method for drying the wet sealer layer is not particularly limited, and any conventionally known method can be used. For example, a method of applying a required amount of heat for a required period of time using a jet drying oven can be used to dry the wet sealer layer.

[0053] <Topcoat painting process> The topcoat application process is a process in which a topcoat is applied to the formed sealer layer 2 to form a wet topcoat layer. That is, the topcoat is applied to the surface of the sealer layer 2 on which the silica sand 3 is fixed, thereby covering the surfaces of the sealer layer 2 and the silica sand 3 with the topcoat layer 4. The topcoat can be any of the above-mentioned topcoats. The application method is not particularly limited, and conventionally known application methods can be used. Examples of application methods for the topcoat include application methods using a roll coater, a flow coater, and a spray. The topcoat is applied using these application methods, preferably so that the thickness of the topcoat layer 4 is 10 μm or more and 50 μm or less. If the thickness of the topcoat layer 4 is 10 μm or more and 50 μm or less, the ceramic building material 10 has a matte, luxurious gloss and a textured feel due to its unevenness.

[0054] In this embodiment, by providing the surface of the ceramic building material 10 with irregularities, not only is a matte, luxurious glossy finish achieved, but the irregularities also provide a tactile feel, so it is preferable that the upper part of the silica sand 3 protrude from the surface of the topcoat layer 4. By making the upper part of the silica sand 3 protrude from the surface of the topcoat layer 4, it is possible to form irregularities resulting from the outer shape of the silica sand 3 on the surface of the monochromatic black ceramic building material 10. In order to make the upper part of the silica sand 3 protrude from the surface of the topcoat layer 4, it is preferable that the thickness of the topcoat layer 4 be smaller than the diameter of the silica sand 3 particles.

[0055] The topcoat paint used in this embodiment preferably contains the above-mentioned black pigment. When the topcoat paint for forming the topcoat layer 4 contains a black pigment, after the silica sand 3 is fixed to the sealer layer 2, a coating of the topcoat paint is formed on the sealer layer 2 and the silica sand 3, so that the entire surface of the resulting building material can be colored in a single black color.

[0056] <Top coat drying process> The topcoat layer drying step is a step of drying the undried topcoat layer formed in the topcoat paint application step to form the topcoat layer 4. That is, by drying the undried topcoat layer, the topcoat layer 4 containing the silica sand 3 is formed.

[0057] The method for drying the wet topcoat layer is not particularly limited, and any conventionally known method can be used. Examples of the method for drying the wet topcoat layer include a method in which a required amount of heat is applied for a required period of time using a jet drying oven.

[0058] (Clear paint painting process) In addition to the above-described steps, for example, a clear coating step can be performed to manufacture a ceramic building material 10 having a clear layer 5. The clear coating step is a step in which a clear coating is applied to the top coat layer 4 formed in the top coat layer drying step to form an undried clear layer. That is, the clear coating is applied to the surface of the top coat layer 4, which has irregularities due to the silica sand 3, to cover the surface of the top coat layer 4 with the clear coating. The above-described clear coating can be used as the clear coating. The application method is not particularly limited, and conventionally known application methods can be used. Examples of application methods for the clear coating include application methods using a roll coater, a flow coater, and a spray. Using these application methods, the clear coating is preferably applied so that the thickness of the clear layer 5 is 10 μm or more and 30 μm or less.

[0059] (Clear layer drying process) The clear layer drying process is a process of drying the undried clear layer formed in the clear paint coating process to form the clear layer 5. That is, by drying the undried clear layer, the clear layer 5 having irregularities due to the silica sand 3 is formed.

[0060] The method for drying the undried clear coat layer is not particularly limited, and any conventionally known method can be used. For example, a method of applying a required amount of heat for a required period of time using a jet drying oven can be used to dry the undried clear coat layer.

[0061] The black ceramic building material 10 of this embodiment obtained by the above-mentioned manufacturing method has a lightness of L * The value of L may be less than 40. * Even if the ceramic building material 10 satisfies the value < 40, a matte, luxurious glossy finish can be obtained, and unnatural unevenness in the appearance of the finished product can be suppressed. [Example]

[0062] The present invention will be explained in more detail below with reference to examples, but the present invention is not limited to the following examples.

[0063] <Material> The materials used in the present examples and comparative examples are shown below. (1) Ceramic substrates Ceramic substrate (cement mixture, bulk density 0.9 to 1.2, flat pattern (pattern depth 1.5 mm or less), plate thickness 15 mm) (2) Sealer paint Water-based acrylic silicone emulsion resin sealer paint (3) Silica sand Silica sand (SiO2>90%), sizes 6-9 (4) Topcoat paint Water-based acrylic silicone emulsion resin topcoat paint (including black pigments) (5) Clear paint Water-based acrylic silicone emulsion resin clear paint

[0064] <Examples 1 to 7, Comparative Examples 1 and 2> A black ceramic building material was prepared by the following method.

[0065] A sealer coating was applied to a ceramic substrate using various coating machines to create a sealer layer with a thickness of 50 μm.

[0066] Next, silica sand having particle sizes of No. 6 to No. 8 shown in Table 1 below was spread on the prepared sealer layer using a sand spreader in the amount shown in Table 1.

[0067] Next, the sealer layer on which the silica sand had been scattered was dried using a jet drying oven to produce a sealer layer on whose surface the scattered silica sand was fixed.

[0068] Next, a top coat paint was applied to a thickness of 20 μm on the sealer layer with the silica sand fixed to the surface using a flow coater type painter to prepare an undried top coat layer.

[0069] The undried topcoat layer was then dried using a jet drying oven to prepare a topcoat layer.

[0070] Next, a clear coating was applied onto the prepared top coat layer using an airless spray coating machine to prepare a wet clear layer having a thickness of 20 μm.

[0071] Next, the undried clear layer was dried using a jet drying oven to prepare a clear layer.

[0072] <Evaluation> The prepared ceramic building materials of the Examples and Comparative Examples were applied to the exterior wall surface in 4 to 6 rows vertically and 1 to 3 rows horizontally, and the prepared black-based single-color exterior wall surface was evaluated as follows. The results are shown in Table 1.

[0073] [L * value] The black-based single-color exterior wall surface was measured using a known color difference meter. * As a result, the L value of each of the Examples and Comparative Examples was* The value was about 30.

[0074] [Glossiness] The produced black-based single-color exterior wall surface was evaluated for the roughness of the sand by touching with a finger, and for the roughness and gloss (shininess) by visual inspection. The evaluation criteria are shown below. A: It has a sufficient texture and a luxurious matte finish. B: The unevenness is small and there is some gloss (shininess), but it is not a problem. C: No unevenness is felt and there is a high gloss (luster).

[0075] [Unevenness] The manufactured black-based single-color exterior wall surface was visually inspected from various positions and angles to evaluate the unevenness of the sand and the appearance of the construction. The evaluation criteria are as follows: A: The sand is dispersed sufficiently and there is no sense of unevenness. B: There is some unevenness in the sand, but it is not a problem. C: The sand is uneven and disproportionate.

[0076] [Table 1]

[0077] <Examples 8 to 13> A black monochromatic ceramic building material was produced in the same manner as in Example 4, except that the thickness of the sealer layer and the thickness of the topcoat layer were as shown in Table 2.

[0078] [evaluation] The produced black ceramic building material was used to produce a black exterior wall surface in the same manner as in Example 1, and then the L * The evaluation was carried out on the value, glossiness and unevenness. * All values ​​were around 30. The results for gloss and unevenness are shown in Table 2.

[0079] [Table 2]

[0080] <Examples 14 to 17> The amount of silica sand to be spread, the thickness of the sealer layer, and the thickness of the topcoat layer were as shown in Table 3, and for Examples 15 and 17, black-based solid-color ceramic building materials were prepared in the same manner as Examples 14 and 16, respectively, except that the clear layer was omitted.

[0081] [evaluation] The produced black ceramic building material was used to produce a black exterior wall surface in the same manner as in Example 1, and then the L * The evaluation was carried out on the value, glossiness and unevenness. * All values ​​were around 30. The results for gloss and unevenness are shown in Table 3.

[0082] [Table 3] [Explanation of symbols]

[0083] 10 Ceramic building materials 1. Ceramic substrate 2 Sealer Layer 3 Silica sand 4 Top coat 5 Clear Layer

Claims

1. Ceramic substrates and a sealer layer formed on the ceramic substrate; A black-based monochromatic ceramic building material comprising: a topcoat layer formed on the sealer layer; the topcoat layer contains silica sand having a particle size of no. 6 or more and no. 8 or less; The content of the silica sand per unit area in the ceramic building material is 30 g / m ２ 130g / m or more ２ Ceramic building materials that are less than

2. The ceramic building material according to claim 1 , wherein the ceramic substrate has a stem depth of 1.5 mm or less.

3. The lightness L of the ceramic building material ＊ The ceramic building material according to claim 1 or 2, wherein the value is less than 40.

4. The ceramic building material according to claim 1 or 2, wherein the sealer layer has a thickness of more than 30 μm.

5. 3. The ceramic building material according to claim 1, wherein the topcoat layer has a thickness of 10 μm or more and 50 μm or less.

6. The ceramic building material according to claim 1 or 2, wherein the topcoat layer contains a black pigment.

7. The ceramic building material according to claim 1 or 2, further comprising a clear layer formed on the top coat layer.

8. a sealer coating step of coating a ceramic substrate with a sealer coating to form an undried sealer layer; a silica sand scattering step of scattering silica sand having a particle size of No. 6 or more and No. 8 or less on the undried sealer layer; a sealer layer drying step of drying the undried sealer layer on which the silica sand has been scattered to form a sealer layer in which the silica sand has been fixed; a topcoat coating step of coating a topcoat on the sealer layer to form an undried topcoat layer; and a topcoat layer drying step of drying the undried topcoat layer to form a topcoat layer, In the silica sand scattering step, the amount of silica sand scattered per unit area is 30 g / m ２ 130g / m or more ２ A manufacturing method for black ceramic building materials with a color of less than 100%.

9. a clear coating coating step of coating a clear coating on the top coat layer to form an undried clear layer; The method for producing a ceramic building material according to claim 8, further comprising a clear layer drying step of drying the undried clear layer to form a clear layer.

Images