JPH058082B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for manufacturing a cement decorative board suitable for flooring and other interior and exterior materials for buildings. More specifically, the present invention relates to a method of applying slip resistance to the surface of a decorative board.

[Prior Art] The present inventor has developed an ultra-high-density superstructure that does not contain any aggregates such as sand or gravel, does not crack or warp after molding and hardens, and has high density and strength based on the theory of slate formation. A method for manufacturing highly compressible, unfired cement decorative boards was proposed (Japanese Patent Application Laid-open No. 128246-1983).

This manufacturing method is a method in which Portland cement is mixed with inorganic fine powder and reinforcing fibers, the mixture is kneaded with water, and the mixture is compression molded and hardened at a pressure of 600 to 4000 kg/cm ² .

[Problems to be solved by the invention] However, decorative laminates obtained by conventional manufacturing methods,
The cement glue in the mold is compressed and hardened using a pressure plate with a smooth surface, so the surface of the decorative board is smooth, and when this decorative board is used for flooring, it is suitable for walking conditions. There was a problem that it became slippery.

For this reason, attempts have been made to provide a large number of irregularities on the surface of the pressure plate, but this increases the cost of the pressure plate and creates the hassle of replacing the pressure plate depending on the purpose of the decorative board.

The object of the present invention is to solve the above-mentioned problems, and to provide a cement veneer that does not require replacing the pressure plate depending on the purpose of the veneer, and can provide slip prevention on the surface of the veneer easily and inexpensively. The object of the present invention is to provide a method for manufacturing a board.

[Means for Solving the Problems] The present invention provides a method of pouring cement paste mainly composed of Portland cement (hereinafter simply referred to as "cement") into an open formwork, and then covering the top surface of the cement paste. A pressure plate with a smooth surface is placed on top of the paper, and the cement paste in this form is compressed and molded by applying a pressure of 600 to 4000 kg/cm ² to the pressure plate. , characterized in that the paper is removed and cured.

[Operation] When compression molding is performed with paper interposed between the pressure plate and the cement paste, the paper adheres to the surface of the molded product, which should be smooth after molding. Therefore, by removing this paper and curing, a cement decorative board with a rough surface can be obtained.

For this reason, the paper used in the present invention has a surface that has not been subjected to surface treatments such as gloss treatment or water-repellent treatment, and has water absorption properties, so that when it is peeled off from the surface of the molded product after the pressure plate is removed, The paper is strong enough not to be damaged. For example, the thickness is 0.3 to 1.0
Examples include Japanese paper or Western paper of about mm.

The cement paste may be made by kneading only cement with water, but it may also contain a filler made of inorganic fine powder such as calcium carbonate or bentonite, or reinforcing fibers such as steel fibers, mineral fibers, or synthetic fibers. The mixing amount of these materials is selected from the range of 3 to 30 parts by weight of inorganic powder and 0.1 to 15 parts by weight of reinforcing fiber per 100 parts by weight of cement.

The water content of the cement paste is selected from the range of 5 to 16 parts by weight based on 100 parts by weight of cement in order to cause hydration of the cement and to facilitate molding of the kneaded product. Cement paste mixed at the above weight ratio is filled into a mold with an open top.

A piece of paper is placed to cover the top surface of the cement glue filled in the formwork, a pressure plate with a smooth surface is placed on top of this paper, and the cement glue in the formwork is placed on the pressure plate.
Compression molding is performed by applying a pressure of 600 to 4000 kg/cm ² .
Immediately after removing the pressure plate, the paper is peeled off from the molding. After demolding, this molded product is cured and hardened. The cured molded product is impregnated with resin depending on the purpose.
Top surface treated.

The cement decorative board thus obtained has a dense structure and high strength due to ultra-high pressure compression molding, and the decorative board does not slip even when walked on.

[Effects of the Invention] As described above, according to the manufacturing method of the present invention, there is a slight improvement in the conventional manufacturing process by simply inserting paper between the pressure plate, cement paste, and the pressure plate during pressurization. The surface of the decorative board is rough, and pedestrians will not slip on it even if the decorative board is used as a flooring material.

[Example] White Portland cement is 100 parts by weight, and the specific surface area is determined by the Blaine method, which is a fineness test method.
15 parts of calcium carbonate at 10000cm ² /g, 7mm long
A mixture of 0.5 parts of acrylic fibers with a diameter of 2 μm was kneaded with a 2% aqueous solution of methylcellulose to prepare cement paste, and the inner dimensions were 110 x 90 x 6 mm with an open top.
filled into a steel formwork.

Next, apply a layer of 0.5mm thick to cover the cement glue above.
wallpaper was placed on top of the cement glue. A pressure of 3000 kg/cm ² was applied onto this wallpaper using a pressure plate with a smooth surface to compact the cement paste.

After demolding, to prevent moisture from escaping from the molded product, place the molded product in a sealed container made of synthetic resin.
It was cured at 60°C for about 2 hours. The molded product was taken out of the sealed container, allowed to cool naturally, and then immersed for 10 seconds in a urethane solution containing 18% toluene and ethyl acetate, thereby covering the molded product with a urethane film.

This decorative board had a bending strength of approximately 180 kg/cm ² and a specific gravity of 2.46, comparable to natural slate, and did not cause salt blistering even when wet with water. Additionally, because this decorative board was not fired, it had extremely high dimensional accuracy compared to conventional boards.

In particular, even though it was impregnated with resin, the surface was rough, so even when it was used as a flooring material, it did not slip when walking on it.

Claims (1)

[Claims] 1. After putting cement paste whose main ingredient is Portland cement into a mold with an open top, paper is placed to cover the top of the cement paste, and a pressure plate with a smooth surface is placed on top of the paper. Then, apply 600 to 4000 kg of cement glue in this formwork to the pressure plate.
1. A method for producing a cement decorative board, which comprises compression molding by applying a pressure of cm ² and then removing the paper and curing it.