JPS5811393B2 - Manufacturing method for cosmetic cement products - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing decorative cement products, and is particularly useful for manufacturing roof tiles.

Cement tiles are well known as Japanese tiles. To manufacture these tiles, a relatively hard mortar made of a 1:3 ratio of cement to sandstone (by weight) is placed on the template of a tile making machine. This mortar is rolled into the template using rollers, and the excess mortar is scraped off.The molded product thus formed is removed from the tile making machine along with the template, and after being air-dried to some extent, it is forcedly cured by heating. There is.

However, in the production of this tile, cracks are likely to occur when the molded product is naturally dried, and this is especially true for onigawa tiles, ridge end decorative tiles, etc.
This cracking is noticeable in tiles with complicated shapes, such as eave tiles and corner tiles.

The cause of this cracking is thought to be that moisture evaporates only from the surface of the molded product during drying, making it difficult to dry the entire molded product uniformly.

In view of the current situation, the applicant of this application first mixed inorganic foamed aggregate such as natural pumice, foamed silica sand, etc. into cement.
It is proposed to harden this with a water content of 3 to 10% by weight, press-form this cement mixture into the shape of a roof tile at a pressure of 200 to 600 kg/cm2, dry this molded product naturally, and then force curing it. did.

In this tile manufacturing method, the amount of water added is 3 to 10%.
After pressing, the fluidity of cement is sufficiently restricted, and the molding pressure is 200 to 600 kg/cm2, which sufficiently suppresses the impregnation of the cement paste into the inorganic foamed aggregate. The molded body contains inorganic foamed aggregate in a porous state that is not impregnated with cement paste.

Therefore, due to the porosity of the inorganic foam aggregate, moisture evaporates from the inside of the molded product when drying the molded product, and as a result, the entire molded product dries uniformly, eliminating the occurrence of cracks mentioned above. be done.

By the way, roof tiles are required to be colored and decorated, and this makeup needs to have a dull and calm appearance.

One possible method for this cosmetic method is to spray a colored cement aqueous solution containing relatively large diameter inorganic particles.

According to this makeup method, the makeup surface is made uneven, so
Fully matte makeup is possible.

In addition, since this decorative material contains cement,
If the above spraying is performed on a cement-uncured product, the decorative material will be firmly bonded to the cement-cured product when the uncured product is cured.
Makeup with excellent peel strength can be applied.

In the tile manufacturing method previously proposed by the applicant, it is possible to use the spray cosmetic method described above to apply makeup to the tile. When the above colored cement aqueous solution containing granules was sprayed onto an unhardened cement molded product containing foamed aggregate in a porous state and the molded product was dried, the colored cement solution formed into an unhardened cement molded product. It was impregnated into the porous epidermis of the skin, making it possible to apply makeup with outstanding peeling resistance.

However, in the case of three-dimensional shaped ridge tiles, until the colored cement aqueous solution dries, the particles in the aqueous solution shift due to their weight on both sides of the ridge tile, and therefore the matting effect of the particles is reduced. I discovered that I could not make it work effectively.

The method for producing a cosmetic cement product according to the present invention prevents the above-mentioned shift and movement of the granules when applying a cosmetic by spraying a colored cement aqueous solution containing granules, allows the granules to adhere uniformly, and gives an overall glossy appearance. This is a method that allows you to apply makeup without any makeup.

Furthermore, according to the present invention, it is possible to apply makeup with extremely high peeling resistance.

In other words, the method for producing a cosmetic cement product according to the present invention prevents the above-mentioned shift and movement of the granules when applying a cosmetic by spraying a colored paint containing granules, allows the granules to adhere uniformly, and improves the overall appearance. This is a method that allows you to apply makeup that is matte and subdued.

A further object of the present invention is to provide makeup with outstanding peeling resistance.

Furthermore, another object of the present invention is to apply makeup with excellent water resistance.

That is, the method for producing a decorative cement product according to the present invention involves preheating an uncured cement molded product to about 40° to 70°C;
Spraying a colored liquid mixed with resin and cement containing inorganic particles with a diameter of 1.5 to 0.1 mm onto the surface of the preheated molded product,
This method is characterized by curing the molded product afterwards.

In the present invention, the resin/cement mixed colored liquid containing inorganic particles contains a colored cement composition having the following composition and a diameter of 1.
．． Mix 5 to 0.1 mm of colored silica sand (same color as the colored cement composition) at a ratio of 1:1, and add a resin emulsion made by adding 65 parts of water to 100 parts of a water-dispersible resin, such as an acrylic resin, to the above mixture. A mixture at a ratio of 2 to 3:1 can be used.

Compounding of colored cement composition Silica flour 7 parts Whiten 12 parts Cement 9 Silica sand 3 Asbestos 2 Pigment Rest In the present invention, the uncured cement molded product contains porous inorganic foam aggregate. contained in the state.

Therefore, if a resin/cement mixed colored liquid is sprayed, this colored liquid will be impregnated into the porous skin of the uncured cement molded product.
Since the cement granules in this colored liquid bond to the porous structure of the cement molded product during curing, a cosmetic with excellent peeling resistance can be applied.

Furthermore, in the present invention, since the resin/cement mixed colored liquid containing granules is sprayed onto the preheated uncured cement molded product, the water in the colored liquid that adheres to the surface of the molded product evaporates immediately. Since the particles are scattered and the viscosity of the adhering liquid is increased, the adhering particles do not fall off due to their own weight, and the particles can be evenly adhered.

Therefore, it is possible to apply makeup that is dull and subdued as a whole.

In the present invention, the preheating temperature of the uncured cement molded product is set to 4
The reason for limiting the temperature to 0° to 70°C is that below 40°C there is no effect on the above-mentioned evaporation and scattering of moisture, and above 70°C the cement of the molded product undergoes a rapid hydration reaction, and internal stress due to this hydration reaction occurs. This is because there is a concern that cracks may occur in the molded product.

In the present invention, the molded article is firstly cured by natural curing for one day, and then finally cured by autoclaving.

This autoclave curing is usually performed by heating with saturated steam at 5 to 8 atmospheres for about 10 hours.

During this autoclave curing, the resin in the liquid adhering to the surface of the molded product is baked, increasing the watertightness of the decorative film and further improving the peeling resistance of the decorative film.

As is clear from the above description, according to the present invention, it is possible to apply a coloring to a cement product that has excellent peeling resistance and is water-tight overall. Extremely useful in manufacturing.

Claims (1)

[Claims] 1 Preheat the uncured cement molded product to approximately 40° to 70°C,
Spraying a colored liquid mixed with resin and cement containing inorganic particles with a diameter of 1.5 to 0.1 mm onto the surface of the preheated molded product,
A method for producing a cosmetic cement product, which is characterized in that the molded product is then cured.