JPH03122073A - Colored inorganic molded board - Google Patents

Abstract

PURPOSE:To provide a molded board having a stable color for a long period with a small amount of a pigment by coloring the main body layer of a fiber- reinforced cement board with a dye and also the decorative layers thereof with the pigment, the fiber-reinforced cement board comprising the main body layer forming the thick portion thereof an the thin decorative layers laminated to the front (and back) surfaces of the board. CONSTITUTION:The colored inorganic molded board comprises a main body layer 1 forming the thick portion thereof and one or two decorative layers 2 integrally laminated to the front (and back) surfaces thereof, the layers 1 and 2 being colored with a dye and a pigment, respectively. Since the layer 1 is isolated from the outside due to the layer 2, the color of the layer 1 is not deteriorated even when a dye having no weather resistance is employed, while since the layer 2 is thin, the pigment employed for the layer 2 can be reduced, thereby permitting to profitably color and decorate the board.

Description

[Detailed description of the invention] [Industrial application field] This invention relates to an improvement of a non-colored 1t9f molded plate.

[Conventional technology]

BACKGROUND ART Conventionally, building material boards and the like have been widely formed using fiber-reinforced cement compounds.

Since these inorganic products have an achromatic base color ranging from gray to gray-black, they are unsuitable as decorative materials as they are, and generally the front or back surfaces are colored to give them aesthetic appeal.

As a means of coloring, the surface of the product is painted with emulsion resin, etc. However, no matter how good the weather resistant paint is, the weather resistance of these coatings is limited.
There is a problem that eventually it will deteriorate and as a result of separating it and exposing the base, it will become unsightly.

On the other hand, it is also possible to mold the product using cement material containing pigments and color the entire product. Colored products have the advantage that no matter how much the surface deteriorates or weathers, the product surface will not become unsightly because the material is colored.

[Problems with conventional technology]

However, when coloring the entire product, it is necessary to use a fairly large amount of pigment to achieve the desired color, and adding too much pigment may affect the product strength, resulting in inconveniences such as reduced bending strength. There was a problem.

In addition, pigments are expensive as coloring materials, and large quantities of pigments are difficult to employ due to manufacturing costs.

It is also possible to use dyes as colorants, which are cheaper than pigments, but dyes have poor weather resistance, especially against ultraviolet rays.
When used as a coloring material for exterior wallboards, etc., there was a problem in that the color rapidly bleached due to sunlight and the meaning of the coloring was lost.

[Problem to be solved by the invention]

In view of the above-mentioned problems, the present invention provides a colored inorganic molded plate that can be manufactured easily and at low cost even though pigments are used to color inorganic products without requiring a painting process. It was done for the purpose of

[Technology that led to solving the problem]

That is, the colored inorganic molded board of the present invention is a fiber-reinforced cement board consisting of a main body layer that substantially forms the wall thickness of the molded board, and a decorative layer that is thinly laminated and integrated on the front or back surfaces of the main body layer. The main body layer is colored with a dye,
The cosmetic layer is characterized in that it is colored with a pigment.

[Effect]

In this invention, as shown in FIG. 1, the colored inorganic molded plate consists of a main body layer l forming a substantial wall thickness and a decorative layer 2.2 laminated and integrated on the front or back surfaces of the main body layer l, and Layer 1 is colored with dyes and decorative layer 2.2 with pigments.

Therefore, since the main body layer 1 is shielded from the outside by the surface decorative layer 2.2, even if it is colored with dyes without weather resistance, these will not deteriorate as long as the decorative layer 2.2 exists; Since the layer 2.2 is thin, the amount of pigment used can be kept low, allowing for economical colored makeup.

Further, even if the surface layer 2.2 were to be destroyed by an external impact or the like, the damage would not be noticeable because the main body layer I is colored.

〔Example〕

Next, the present invention will be explained in detail.

40% by weight of cement, 35% by weight of silica, fine aggregate 14.
5% by weight, reinforcing pulp fiber 5% by weight, extrusion aid 0.5
Add 2% by weight of a basic dye as a red dye to the water, mix uniformly with the required amount of water to make a slurry, extrude it into a plate with a thickness of 13 mm, and add 40% by weight of cement and 35% of silica onto the main body layer. %, fine aggregate 14.5% by weight, reinforcing bulb fiber 5% by weight, extrusion aid 0.5% by weight, red pigment 5% by weight and mixed uniformly with the required amount of water to form a slurry. None, the slurry was simultaneously extruded onto the main body layer to a thickness of In and integrated.

The laminated product was first cured at room temperature and then cured at high temperature and pressure in an autoclave to obtain a product.

When the product was broken and the broken surface was observed, it was confirmed that the boundary between the surface layer and the main layer was completely unclear, and the coloring was uniform.

Next, the above board material (thickness 12 cm, length 30 cm, width 25 cm)
cm) was subjected to a bending test and found to be 180k.
g/cut, and it was found that there was no decrease in strength due to the addition of pigment.

〔effect〕

As explained above, the colored WaX molded plate of the present invention is
The entire board is colored, and the surface is colored with weather-resistant pigments, so there is no UV deterioration, and the color remains stable over a long period of time.Also, since the internal coloring is dye, the coloring materials are inexpensive. In addition, since it is protected by the surface layer, there is little deterioration (and even if the surface layer is damaged for some reason, it is less noticeable).

[Brief explanation of drawings]

FIG. 1 is a sectional view of the embodiment.

Claims (1)

[Claims] (1) A fiber-reinforced cement board consisting of a main body layer that substantially forms the wall thickness of a molded board, and a decorative layer that is thinly laminated and integrated on the front or back surfaces of the main body layer, wherein the main body layer is 1. A colored inorganic molded plate, characterized in that it is colored with a dye, and the decorative layer is colored with a pigment.