JPH0840785A - Production of cement plate - Google Patents

Abstract

PURPOSE:To provide a method for producing a cement plate, hardly impairing color tone and quality of sprayed colored particles. CONSTITUTION:The method for producing a cement plate is to form a substrate 1 composed mainly of cement, spray colored particles 2 onto the surface of the substrate 1, fix the colored particles 2, apply a water repellent material to at least the top 2a of the colored particles 2 on the substrate 1, apply an aqueous coating material onto the surface of the substrate from the outside of the colored particles and form a coating film 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention spreads and fixes colored particles on the surface of a cement plate containing cement as a main material, and applies a water-based paint from the outside of the colored particles onto the surface of the cement plate. The present invention relates to a method for manufacturing a cement board for forming a coating film.

[0002]

2. Description of the Related Art Conventionally, in manufacturing a cement board, coloring particles are dispersed and fixed on the surface of the cement board, and the cement board is colored by the dispersed arrangement of the coloring particles, and a method of distributing the coloring particles. According to this, a texture is given to the cement board by a three-dimensional appearance of the colored particles and a delicate texture depending on the light irradiation condition, and patterning is performed. Further, usually, a water-based paint is further applied from the outside of the colored particles to form a coating film, and the cement plate is processed to be waterproof and to prevent deterioration due to ultraviolet rays or the like.

[0003]

According to the above-mentioned conventional manufacturing method, as shown in FIG. 3, since a coating film of an aqueous paint can be formed on the surface of the cement board from the colored particles, the coating film is colored. In the case of, the color of the colored particles is covered or changed by overlapping with the coating film, the color of the cement plate becomes different from the color of the colored particles, and a subtle color or texture is obtained. It was easy to lose the advantage that can be expressed by colored particles.

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

Therefore, in view of the above drawbacks, 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 not easily impaired.

[0006]

[Means for Solving the Problems] Coloring particles are dispersed and fixed on the surface of a cement plate containing cement as a main material, and a water-based paint is applied from the outside of the coloring particles onto the surface of the cement plate. In the case of forming a coating film, the characteristic means of the present invention for attaining the above object is to fix colored particles on the surface of the cement board, and then, before applying the water-based paint, coloring on the cement board. The water repellent material is applied to at least the top of the particles. Further, in order to fix the colored particles on the surface of the cement plate, before the cement plate is completely cured, spray the colored particles on the cement plate, press the colored particles to the cement plate by pressure. 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,
At least the top of the colored particles, that is, since the water repellent material is applied to the site opposite to the side where the colored particles are fixed to the substrate, the aqueous paint is then applied to the outside of the colored particles on the surface of the cement plate. 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 colored particles are fixed. Will not be formed. Therefore, the colored particles are exposed on the cement plate, and the color tone of the colored particles is easily visible from the outside. Therefore, even if the coating film is colored, it is possible to express the delicate hue and texture of the cement plate without impairing the coating film.

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 serves as a non-slip when a person walks on the cement board. .

In order to fix the colored particles on the surface of the substrate, the colored particles may be sprayed on the cement plate before the cement plate is completely cured, and the colored particles may be pressure-bonded to the cement plate. While the colored particles are half-embedded on the substrate, they are firmly fixed on the substrate surface,
The colored particles can be fixed on the substrate with the tops arranged almost uniformly. If the water repellent material is applied to the colored particles by a roller, the water repellent material can be easily applied only to the tops of the colored particles and the vicinity thereof.

[0010]

Therefore, the cement plate is colored by the colored particles, and while the coating film is formed on the cement plate, the texture of the colored particles due to the difference in the three-dimensional appearance of the colored particles can be obtained depending on the distribution of the colored particles. , It is possible to give a delicate texture to the cement board depending on the light irradiation condition, to perform patterning, to manufacture a highly designed cement board, and to form a coating film to protect the cement board from waterproofing and ultraviolet rays. It is possible to prevent deterioration and provide cement boards with high commercial value.

[0011]

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

First, a so-called dry method is used, in which a cement material composed of cement, sand, pulp, etc. is prepared and supplied in layers on a conveyer, water is supplied to the cement material and pressure is applied to form the cement material into a plate shape. By the method, a plate-shaped body containing cement as a main material is formed. A colored layer is formed on one surface of the plate-like body with colored cement formed by mixing a pigment into a cement material, and the cement substrate 1 is molded.

On the substrate 1, colored silica sand 2 is used as colored particles.
After being sprayed, pressure is applied to the substrate 1 so that the substrate 1 is half-embedded and fixed (see FIG. 2A), and a delicate color, texture, or uneven shape is imparted to the colored layer of the substrate 1. After that, when the water repellent material 3 is applied by a roller, the water repellent material 3 is applied only to the top portion 2a of the colored silica sand 2 (see FIG. 2B).

Next, the substrate 1 is naturally cured and cured, punched and formed into product dimensions, and then a water-based paint made of acrylic emulsion is applied to form a coating film 4 (FIG. 2C).
After further curing the cement material in an autoclave, apply a top coat material made by mixing a pigment in an acrylic emulsion and dry it to obtain a cement board product.

When a water-based paint is applied to the substrate, a coating film 4 is formed on the surface of the substrate as shown in FIG. 1, but the colored silica sand is exposed on the surface of the cement plate, resulting in a color tone with a less glossy appearance. In addition to being obtained, a rough texture is obtained, and a surface state in which a non-slip effect can be exerted is also obtained.

[Other Embodiment] Another embodiment will be described below.
In the previous example, the dry-molded substrate 1 was used, but the invention is not limited to this.
You may use the cement substrate obtained by what is called wet molding which hardens.

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

Further, the colored particles are fixed by semi-embedding in a cement material which is not completely hardened, but the present invention is not limited to this, and they may be fixed by adhesion on a hardened cement base material, and these are collectively simply fixed. Call.

The cement board product may be used for any purpose such as roofing materials and wall materials. Further, the water-based paint is not limited to the acrylic emulsion, and may be a vinyl resin, a rubber emulsion composition, or the like. When an acrylic emulsion is used, it is fading due to light because of its excellent ultraviolet resistance. It is convenient in preventing

It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of 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 according to the present invention.

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

[Explanation of symbols]

 1 substrate 2 colored particles 2a top 3 water repellent 4 coating film

Claims (3)

[Claims] 1. A substrate (1) containing cement as a main material is molded, and colored particles (2) are dispersed and fixed on the surface of the substrate (1), and the substrate (1) is coated with the colored particles (2). A method for producing a cement plate, which comprises forming a coating film (4) by applying a water-based paint from the outside of the colored particles (2), comprising fixing the colored particles (2) on the surface of the substrate (1), A method for producing a cement board, wherein a water repellent material (3) is applied to at least the tops (2a) of the colored particles (2) on the substrate (1) before applying the water-based paint. 2. In order to fix the colored particles (2) on the surface of the substrate (1), the colored particles (2) are dispersed 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 pressure-bonded to 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) with a roller.