JPS62109605A - Manufacture of cement decorative board - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application 1] The present invention relates to a method for manufacturing a cement decorative board suitable for flooring materials and other interior and exterior materials for buildings. 31! More specifically, it relates to a method of applying anti-slip properties to the surface of decorative laminates.

[Prior Art 1] 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. We proposed a manufacturing method for highly compressible and unfired cement decorative boards (Unexamined Japanese Patent Publication +
1i59-128248).

This manufacturing method involves mixing inorganic fine powder and reinforcing fibers with Portland cement, kneading the mixture with water, and
This is a method of compression molding and hardening at a pressure of N4000Kg/c+w'.

[Problems to be solved by the invention] However, decorative laminates obtained by conventional manufacturing methods are made by compressing and hardening cement paste in a mold using a pressure plate with a smooth surface. , the surface of the decorative board becomes smooth,
When this decorative board was used for a pedestal, there was a problem that it could become slippery depending on the walking conditions.

For this reason, an attempt was made to provide a large number of irregularities on the surface of the pressure plate, but this increased the cost of the pressure plate and caused 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 anti-slip protection to the surface of the veneer at low cost and easily. 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 cement glue in this form is applied to the pressure plate at a rate of 600 to 400 ml.
It is characterized in that after compression molding is performed by applying a pressure of 000 kg/c+s2, the paper is removed and hardened.

[Function] 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. Examples include Japanese paper or Western paper with a thickness of about 0.3 to 1.0 am.

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 fine powder and 0.1 to 15 parts by weight of reinforcing fiber per 100 parts by weight of cement.

Further, 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. -1 Fill a mold with an open top with cement paste kneaded at the weight ratio listed above.

Place paper so as to cover the top surface of the cement glue filled in the formwork, place a pressure plate with a smooth surface on the two sides of this paper, and apply 600 to 4000 kg of cement glue in the formwork to the pressure plate.
/ cm2 (7) Pressure is applied to compress the material. 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 and top surface treated depending on the purpose.

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, during pressurization in the conventional manufacturing process, a small amount of paper can be inserted between the pressure plate, the cement paste, and the pressure plate. As a result of this improvement, the surface of the decorative board becomes rough, so pedestrians and others will not slip even if the decorative board is used as a flooring material.

[Example] 100 parts by weight of white Portland cement, specific surface area of 10000c by Blaine method, which is a fineness test method.
15 parts of calcium carbonate of m27 H, length 7 mm and diameter 211. A cement paste was prepared by kneading a mixture of 0.5 parts of acrylic fibers with a 2% aqueous solution of methyl cellulose, and the inner dimensions were 110 x 90 x 8 IIl, with two parts opened 1:1.
It was filled into a steel formwork of I11.

Next, wallpaper with a thickness of Q and 5+u+ was placed over the cement paste so as to cover the cement paste. A pressure of 3000 Kg/ctm was applied to the 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 and heat it at 80°C for about 2 hours.
Allowed to cure for 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 to cover the molded product with a urethane film.

This decorative board had a bending strength of approximately 180 kg/cl and a specific gravity of 2.4 B, 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 panels.

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. After arranging the paper and compressing the cement paste in the formwork by applying a pressure of 600 to 4000 kg/cm^2 to the pressure plate, the paper is removed and the cement paste is cured. Method.