JP3174460B2 - Manufacturing method of cement board - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of applying a water-based paint to a cement board mainly composed of cement by spraying and fixing colored particles on the surface of a cement board, and applying the water-based paint to the surface of the cement board from outside the colored particles. The present invention relates to a method for manufacturing a cement board for forming a coating film by performing the method.

[0002]

2. Description of the Related Art Conventionally, in producing a cement board, a method of dispersing and fixing colored particles on the surface of a cement board, coloring the cement board by dispersing the colored particles, and dispersing the colored particles. Thus, a texture due to a difference in the three-dimensional appearance of the colored particles and a subtle texture due to the degree of light irradiation have been applied to the cement board for patterning. In addition, usually, a water-based paint is further applied from the outside of the colored particles to form a coating film, and a process for waterproofing the cement board and preventing deterioration due to ultraviolet rays or the like has been performed.

[0003]

According to the above-mentioned conventional manufacturing method, as shown in FIG. 3, since a water-based paint film is formed on the surface of the cement plate from above the colored particles, the paint film is colored. In the case of, the color of the colored particles is obscured or overlaps with the coating film and changes, so that the color of the cement plate becomes different from the color of the colored particles, resulting in a subtle color or texture. The advantage that can be expressed by the colored particles was not easily exploited.

Further, since the colored particles tend to be embedded in the coating film, even if the coating film is colorless, the unevenness of the colored particles is reduced, and the color tone and texture are also impaired. There is a fear.

Accordingly, an object of the present invention is to provide a method for producing a cement board in which the color tone and texture of the dispersed colored particles are hardly impaired in view of the above-mentioned drawbacks.

[0006]

Means for Solving the Problems Colored particles are dispersed and fixed on the surface of a cement plate mainly composed of cement, and an aqueous paint is applied to the surface of the cement plate from outside the colored particles. In the case of forming a coating film, the characteristic means of the present invention for achieving the above object includes, after fixing coloring particles on the surface of the cement board, before applying an aqueous paint, coloring on the cement board. The purpose is to apply a water repellent material to at least the top of the particles. Further, in order to fix the colored particles on the surface of a cement plate, before the cement plate is completely cured, spray the colored particles on the cement plate, and press the colored particles on the cement plate to perform the compression. Alternatively, the water repellent material may be applied to the colored particles with a roller.

[0007]

[Function] In other words, after fixing the colored particles on the substrate,
Since the water-repellent material is applied to at least the top part of the colored particles, that is, the part opposite to the side of the colored particles fixed to the substrate, the aqueous paint is then applied to the surface of the cement board from outside the colored particles. To form a coating film, the water-based paint is repelled by the water-repellent material, and a coating film can be formed on the substrate except where the coloring particles are fixed, but a coating film is formed on the coloring particles. Is not formed. Therefore, the colored particles are exposed on the cement board, and the color tone of the colored particles is easily seen from the outside. Therefore, even if the coating film is colored, the subtle hue and texture of the cement board can be expressed without impairing the coating film.

[0008] Further, since the colored particles are exposed on the cement board, there is an advantage that when the cement board is used as a roofing material, it also prevents slippage when a person walks on the cement board. .

In order to fix the colored particles on the surface of the substrate, the colored particles are sprayed on the cement plate before the cement plate is completely hardened, and the colored particles are pressed on the cement plate. While the colored particles are firmly fixed on the substrate surface while being buried halfway on the substrate,
The colored particles can be fixed on the substrate in a state where the tops are almost uniformly arranged. Further, if the water repellent material is applied to the colored particles with a roller, the water repellent material can be easily applied only to the top of the colored particles and the vicinity thereof.

[0010]

Accordingly, the coloring of the cement plate is performed by the colored particles, and the texture of the colored particles due to the difference in the three-dimensional appearance depends on the degree of dispersion of the colored particles while forming a coating film on the cement plate. , Giving a subtle texture to the cement board depending on the light irradiation condition, making it possible to perform patterning and producing a highly designable cement board, forming a coating film, waterproofing the cement board and using ultraviolet rays, etc. Deterioration can be prevented, and a cement plate with high commercial value can be provided.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

First, a so-called dry process in which a cement material composed of cement, sand, pulp or the like is prepared, supplied in layers on a conveyor, and water is supplied to the cement material and pressed to form the cement material into a plate shape. By the method, a plate-like body mainly composed of cement is formed. A colored layer is formed on one surface of the plate-like body with a colored cement obtained by mixing a pigment into a cement material, and the cement substrate 1 is formed.

The substrate 1 is provided with colored silica sand 2 as colored particles.
After spraying, the substrate is semi-embedded and fixed in the substrate 1 (see FIG. 2A) to give a subtle hue, texture and unevenness to the colored layer of the substrate 1. Thereafter, when the water repellent material 3 is applied by a roller, the water repellent material 3 is applied only to the top 2a of the colored silica sand 2 (see FIG. 2B).

Next, the substrate 1 is naturally cured and cured, and is punched and formed into a product size, and then an aqueous paint composed of an acrylic emulsion is applied to form a coating film 4 (FIG. 2C).
After curing and hardening of the cement material in an autoclave, an overcoating material obtained by mixing a pigment with an acrylic emulsion is applied and dried to obtain a cement board product.

When the water-based paint is applied to the substrate, as shown in FIG. 1, the coating film 4 is formed on the substrate surface, but the colored quartz sand is exposed on the cement board surface, and the color tone with little gloss on the appearance is obtained. As well as being obtained, a rough texture is obtained, and the surface state is such that a non-slip effect can be exhibited.

[Another embodiment] Another embodiment will be described below.
In the previous embodiment, the dry-formed substrate 1 was used. However, the present invention is not limited to this.
A cement substrate obtained by so-called wet molding for curing may be used.

The colored particles are not limited to the colored silica sand 2, but may be various ceramic particles colored, pigment particles, resin particles, and the like. These are collectively referred to as colored particles. .

Furthermore, the colored particles are semi-embedded and fixed in a cement material that has not been completely cured, but the invention is not limited to this, and they may be adhered and fixed on a cured cement substrate. Call.

The cement board product may be used for any purpose such as a roof material and a wall material. Also, the water-based paint is not limited to the acrylic emulsion, but may be a vinyl resin, a rubber-based emulsion composition, or the like. This is advantageous in preventing

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the accompanying drawings.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a cement board manufactured according to the present invention.

FIG. 2 is a process diagram of a method for manufacturing a cement board of the present invention.

FIG. 3 is a cross-sectional view of a cement board manufactured by a conventional manufacturing method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Substrate 2 Colored particle 2a Top 3 Water-repellent material 4 Coating

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) C04B 41/63 C04B 41/71

Claims (3)

(57) [Claims] 1. A substrate (1) mainly composed of cement is formed, and colored particles (2) are dispersed and fixed on the surface of the substrate (1). A method for producing a cement board in which a water-based paint is applied from the outside to form a coating film (4), wherein the coloring particles (2) are fixed on the surface of the substrate (1). A method for manufacturing a cement board in which a water-repellent material (3) is applied to at least a top portion (2a) of the colored particles (2) on the substrate (1) before applying the water-based paint. 2. Fixing the colored particles (2) on the surface of the substrate (1), by spraying the colored particles (2) on the substrate (1) before the substrate (1) is completely cured. The method for producing a cement board according to claim 1, wherein the colored particles (2) are pressed against the substrate (1). 3. The method for producing a cement board according to claim 1, wherein the water repellent material (3) is applied to the colored particles (2) by a roller.