Building material

Abstract

To provide a building material that can reduce color change between a dry state and a wet state and suppresses deterioration of appearance.SOLUTION: A surface exhibits a wet color due to a solvent. Even in a dry state before getting wet, the surface becomes a color like being in a wet state, so discoloration when it gets wet is hardly noticeable. The solvent preferably has a boiling point of 170°C or higher. In this case, the solvent is less likely to evaporate from the building material so as to make it easier to maintain the wet color.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to building materials. More specifically, it relates to building materials that can be used as ceramic siding or the like.

Background Art

[0002] Conventionally, building materials used as ceramic siding for exterior wall materials and the like have been proposed (see, for example, Patent Document 1). Such building materials are formed by providing a coating film on the surface of a ceramic base material containing cement and aggregates.

[0003] Recently, so-called "exposed" building materials that use the surface of the ceramic base material as it is for finishing have been proposed. In this case, a coating film is not provided on the surface of the base material or is minimized.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, if a coating film is not provided on the surface of the base material, water such as rainwater easily penetrates into the surface of the base material, and a color change occurs on the surface of the base material between the dry state (state where water has not penetrated) and the wet state (state where water has penetrated), resulting in a problem that the appearance of the building material deteriorates.

[0006] The present invention has been made in view of the above points, and an object thereof is to provide a building material that can reduce the color change between the dry state and the wet state and suppress the deterioration of the appearance.

Means for Solving the Problems

[0007] One aspect of the building material according to the present invention is characterized in that the surface exhibits a wet color with a solvent.

Effects of the Invention

[0008] In the present invention, even in the dry state before being wetted with water, it has a color similar to that in the state of being wetted with water, and the discoloration when wetted with water is hardly noticeable. As a result, it is possible to provide a building material that can reduce the color change between the dry state and the wet state and suppress the deterioration of the appearance.

Brief Description of the Drawings

[0009]

Figure 1

Embodiments for Carrying Out the Invention

[0010] Hereinafter, embodiments for carrying out the present invention will be described.

[0011] FIG. 1 shows an example of a building material 100 according to the present embodiment. The surface of this building material 100 exhibits a wet color with a solvent. Such a building material is formed by impregnating a solvent into the surface of a ceramic-based substrate 101. A solvent impregnation layer 102 in which the solvent has penetrated to a predetermined depth is formed from the surface of the substrate 101.

[0012] The substrate 101 is formed of a cured product of a cement-based molding material. The cement-based molding material is obtained, for example, by mixing cement, admixtures containing siliceous materials, reinforcing fibers, extenders, water, etc. Ordinary Portland cement etc. are used as the cement. The admixture containing siliceous materials has, for example, an SiO 2 content rate of 70% by mass or more and a Blaine value of 3000 cm 2At least one component selected from the group consisting of quartz powder of / g or more, quartz powder other than the above, silica powder, granulated blast furnace slag, fly ash, pulp sludge incineration ash, and sludge incineration ash is used. The reinforcing fiber is, for example, at least one component selected from the group consisting of pulp, vinylon fiber, polypropylene fiber, and rock wool. The extender is aggregate (fine sand), crushed waste of recycled cement products, etc., and its average particle size is preferably within the range of less than 5 mm.

[0013] In the cement-based molding material, based on 100 parts by mass of the solid content, the amount of cement is 30 parts by mass or more and 70 parts by mass or less, the amount of the admixture containing silica is 30 parts by mass or more and 60 parts by mass or less, the amount of the reinforcing fiber is 3 parts by mass or more and 6 parts by mass or less, and the amount of the extender is preferably within the range of 5 parts by mass or more and 40 parts by mass or less. Also, in the cement-based molding material, the ratio of the amount of water to the amount of solid content (amount of water / amount of solid content) is preferably within the range of 5 / 95 to 30 / 70.

[0014] The ratio of the molar amount of Ca in the cement-based molding material to the molar amount of Si in the cement-based molding material (molar amount of Ca / molar amount of Si) is preferably 0.5 or more and 0.8 or less. In this case, appropriate efflorescence can be generated on the surface of the base material 101. Therefore, the blending ratio of each component contained in the cement-based molding material is preferably adjusted so that the ratio of the molar amount of Ca to the molar amount of Si is within the above range.

[0015] The cement-based molding material is formed into a molded body having a desired shape. The molding method is selected from, for example, roll pressing molding, extrusion molding, casting molding, papermaking molding, etc. The shape of the molded body is not particularly limited, but is, for example, plate-shaped.

[0016] Next, the base material 101 is formed by subjecting the molded body to primary curing and autoclave curing to harden it. In primary curing, it is preferable to perform curing at normal temperature and normal pressure. In autoclave curing, the conditions are preferably 160°C or higher and 180°C or lower, 0.5 MPa or higher and 0.9 MPa or lower, and 8 hours or longer and 13 hours or shorter. Efflorescence may precipitate on the surface of the base material 101 due to autoclave curing.

[0017] Next, a solvent is applied to and impregnated into the surface of the base material 101. As a result, the solvent penetrates to a predetermined depth from the surface of the base material 101 to form a solvent-impregnated layer 102, and the surface of the base material 101 is colored in a wet color. The thickness of the solvent-impregnated layer 102 is not particularly limited. As the solvent, an organic solvent, an organic compound used as a plasticizer, or the like is used. Examples of the solvent include at least one selected from butyl cellosolve, texanol, dioctyl phthalate (DOP), and the like. It is preferable to use a high-boiling solvent as the solvent, whereby the volatilization of the solvent can be suppressed and the wet color can be maintained over a long period. The boiling point of the solvent is preferably 170°C or higher, more preferably 240°C or higher. The application amount of the solvent can be 50 g / m 2 or more, whereby the wet color can be maintained over a long period. The upper limit of the application amount of the solvent is not particularly limited, but it is preferably 100 g / m 2 or less. Also, when applying the solvent to the surface of the base material 101, any coating device such as a roll coater or a spray device can be used. In the case of an organic compound used as a plasticizer, it is preferably diluted with an appropriate diluting solvent so as to be easily applied.

[0018] Note that, in the above description, the surface of the base material 101 after autoclave curing is impregnated with the solvent. However, the present invention is not limited to this, and after impregnating the surface of the molded body after primary curing with the solvent, autoclave curing may be performed to form the base material 101 having the solvent-impregnated layer 102.

[0019] After forming the solvent-impregnated layer 102 on the base material 101 as described above, it is preferable to form a clear layer 103 on the surface of the solvent-impregnated layer 102. The clear layer 103 suppresses the elution and volatilization of the solvent impregnated in the solvent-impregnated layer 102. Further, the clear layer 103 has transparency to such an extent that the wet color of the solvent-impregnated layer 102 can be seen through. The clear layer 103 is preferably formed of a resin layer such as a coating film. As the paint for forming the clear layer 103, an acrylic paint containing an acrylic resin or an acrylic styrene resin can be used, and it can be applied with any coating device such as a spray. The formation amount of the clear layer 103 is 30 g / m 2 to 100 g / m 2 or less. If the formation amount of the clear layer 103 is less than 30 g / m 2 , the thickness of the clear layer 103 may be too thin and bleed-out may occur. If the formation amount of the clear layer 103 exceeds 100 g / m 2 , the glossiness of the clear layer 103 may be manifested and the painted appearance may become prominent.

[0020] And, by providing the clear layer 103 on the surface of the solvent-impregnated layer 102, it becomes difficult for the solvent to bleed out from the solvent-impregnated layer 102, and the building material 100 is likely to maintain its wet color.

[0021] In the building material 100 according to the present embodiment, in the dry state, since the surface exhibits a wet color, even when it gets wet with water such as rainwater from the dry state, discoloration is less noticeable. Therefore, in the building material 100, the color change between the dry state and the wet state can be reduced, and the deterioration of the appearance can be suppressed. Here, the "wet color" means that the color difference (ΔE) between the color of the surface of the building material 100 in the dry state (moisture content of 30% or less) and the color of the surface of the building material 100 in the wet state is 3 or less. The "wet state" refers to the state after immersing the dry building material 100 in water for 10 minutes. In this case, the building material 100 appears to have little change in the surface color between the dry state and the wet state. The color difference can be measured by, for example, a color difference meter for colors, a spectrocolorimeter, etc.

Example

[0022] Hereinafter, the present invention will be specifically described by way of examples.

[0023] (Examples 1 to 12 and Comparative Examples) A cement-based molding material was prepared by mixing at a ratio of 31.7 parts by mass of cement, 30 parts by mass of an admixture containing silica, 5.1 parts by mass of reinforcing fiber, 33.2 parts by mass of extender, and 15 parts by mass of water. A molded body was produced by molding this cement-based molding material by an extrusion molding method. Next, this molded body was subjected to primary curing (room temperature curing). Next, the molded body was cured by autoclave curing under the conditions of 170 °C, 0.7 MPa, and 10 hours. Thereby, the cement-based molding material was cured to form a base material.

[0024] Next, as shown in Table 1, a solvent was applied to the surface of the base material to form a solvent-impregnated layer. Also, as shown in Table 1, a clear layer was formed on the surface of the solvent-impregnated layer. In this way, a building material was formed.

[0025] (Evaluation) The evaluations shown in Table 1 were performed on the building materials of each example and comparative example.

[0026] The evaluation of "the appearance with the texture of the base material" was performed by visually observing the surface of the building material. ○: Those in which the texture of the ceramic-based base material is clearly visible. △: Those in which the texture of the ceramic-based base material appears. ×: Those in which the texture of the ceramic-based base material is not clearly visible.

[0027] The evaluation of "the wet color after 10 minutes of water immersion" was measured with a color difference meter for the surface of the building material in the dry state and the surface of the building material after being immersed in water for 10 minutes. Then, the color difference ΔE before and after immersion in water was determined. ◎: Those with ΔE of 3 or less ○: Those with ΔE greater than 3 and 4 or less △: Those with ΔE greater than 4 and less than 5 ×: Those with ΔE of 5 or more The evaluation of "color after 10 cycles of warm water test + drying + 10 minutes of water immersion" was carried out by subjecting the building materials to 10 cycles of warm water test (JIS K 5600), then drying them, and then measuring the surface of the dried building materials and the surface of the building materials after immersing them in water for 10 minutes with a color difference meter. And the color difference ΔE before and after immersion in water was obtained. ◎: Those with ΔE of 3 or less ○: Those with ΔE greater than 3 and 4 or less △: Those with ΔE greater than 4 and less than 5 ×: Those with ΔE of 5 or more

[0028]

Table 1

[0029] This embodiment has the following features.

[0030] That is, the surface of the building materials according to this embodiment exhibits a wet color with a solvent.

[0031] In this case, the building materials have a color similar to that in the wet state even in the dry state before getting wet with water, and the discoloration when getting wet with water is hardly noticeable. As a result, the color change between the dry state and the wet state can be reduced, and the deterioration of the appearance can be suppressed.

[0032] In the building materials, it is preferable that the solvent has a boiling point of 170°C or higher.

[0033] In this case, the solvent is difficult to evaporate from the building materials and is easy to maintain the wet color.

[0034] In the building materials, it is preferable that a clear layer is formed on the surface.

[0035] In this case, the clear layer makes it difficult for the solvent to detach (bleed out) from the building materials and is easy to maintain the wet color.

Explanation of symbols

[0036] 100 Building materials 103 Clear layer

Claims

1. A building material having a surface that exhibits a wet color with a solvent.

2. The building material according to Claim 1, wherein the solvent has a boiling point of 170 °C or higher.

3. The building material according to Claim 1 or 2, wherein a clear layer is formed on the surface. ​

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