JPS616188A - Manufacture of glazed cement product - 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 Application Field> The present invention relates to an improvement in the method of manufacturing glazed cement products.

<Prior Art> Cement products have traditionally been widely used in the construction industry, and the methods for finishing their surfaces have diversified. For example, methods include attaching exterior materials such as decorated boards or mosaic tiles to a concrete surface, or methods that omit some exterior work by using pre-glazed cement products.
Various methods are known. In particular, the latter has recently been given the upper hand due to its simplification.

<Problems to be solved by the invention> Conventionally, glazed cement paste has been manufactured by a method of forming a cement-mixed material into the required shape, applying a glaze after first fixing, drying, and then firing. Ta. The L1 stop performed during the process is the direction θ1 of applying the aqueous solution of water glass.
However, the conventional method of applying siliceous powder to the glaze was used. The filling material did not penetrate sufficiently into the inside of the hole etc. [1.The filling was incomplete. As a result, air bubbles may remain on the glazed surface of the fired product, or there may be penetration or pinholes.

The glaze wrinkled in some areas, degrading the beauty of the fired product.

Means for Solving the Problems In order to improve the above-mentioned drawbacks, the present inventor has conducted intensive research on the sealing material to be used and the processing method after sealing, and as a result, has found the following:
By sealing the surface of the cement molded product after demolding with cement and then drying it for ten minutes, it is possible to create an extremely flat finish without creating pinholes or dents on the glazed surface of the fired product. Based on this knowledge, the present invention was completed.

<Structure of the Invention> The gist of the present invention resides in a method for producing a glazed cement product, in which a cement molded body is sealed with cement, dried for <tλ, then glazed and fired.

The present invention will be described in detail. The cement molded body used in the present invention is a kneaded product obtained by adding the required amount of cement, aggregate, water, and various admixtures (e.g., blast furnace slab, fibers) as necessary, and is prepared by pressure dehydration method, extrusion method, etc. Alternatively, it is a cured product that is molded into a desired shape by a casting method and then left to dry or wet.

When sealing a molded object with cement, the important thing is that the surface of the molded object is wet H+7, 1. If it is dry, there is almost no sealing effect even if you use cement. . Therefore, in such cases, moisten the molded product with sufficient water and then dry it. 1. must be carried out.

The cement used for the sealing material does not necessarily have to be the same as the cement used for forming the compact, and may be commercially available Portland cement or blast furnace cement 1-1.
Or select from these mixed cements, etc. as appropriate.

As the filler, the above-mentioned cement may be used as it is in powder form, or it may be used after adding water to form a cement paste. When using a cement base], the water-cement ratio is preferably 20 to 60% by weight, more preferably 25 to 35% by weight.

Next, the method of sealing will be explained. When using powdered cement as a filler, rub it into the molded body with a wet surface while pressing it lightly with a spatula. When using cement paste, apply the cement paste with a brush or spray onto the molded product whose surface is wet, or after dipping the molded product in the cement paste, rub it in with a spatula while pressing it lightly.

In addition, as a sealing method, it is more effective to add water and make a cement paste than to use cement in powder form.

Drying conditions are not particularly limited, but industrially preferred are 70 to 120°C and about 0.5 to 6 hours. This drying operation may be performed immediately after sealing or after the sealing material has hardened. As a result, the surface of the dried molded body has a uniform surface without open pores, which improves contact with the glaze applied subsequently.

The glaze used in the method of the present invention may be any commercially available glaze as long as it melts at a relatively freezing temperature, and the glaze can be applied by conventional methods such as spraying or brushing. The glazed molded body is heated to 600°C in a conventional firing furnace.
(gradually up to 800″C), and at that temperature 0.1~
Bake for 2 hours.

After firing, it may be cured in water depending on the case.

Examples 1 to 2 A wet cavity concrete block (Type A) manufactured according to JI 5-A-5406 was cured in water for 7 [1] period, and then cut at right angles to the thickness direction of the block. and divided into two equal parts. Wipe off the free water on the surface (flat surface) of each of the obtained block pieces with a compress, and then apply Azusadori Portolan 1 to cement or cement paste with a water-cement ratio of 30ffi to that surface. I rubbed in the stopper. After drying each molded body at 1.10°C for 3 hours +'L, a commercially available glaze (trade name: N0.4320M, manufactured by Nippon Horo Glaze Co., Ltd.) was applied, and the molded body was placed in an electric furnace and heated from room temperature. It was baked at 700°C for 20 minutes. A II visual test was conducted on the glazed surface of each fired block piece for pinholes, penetration, and glaze curling. The results obtained are shown in Table 1.

Comparative Examples 1 to 3 [1] Visual test obtained on cement molded bodies processed by squeezing and processing according to Examples [1] to 2 except that in the above Examples, a water glass aqueous solution (concentration 10% by weight) was used as the L1 stopper. The results are shown in Table 1 (ratio Φζ example 1).

In addition, in the above example, in the closing month, 1) silica powder (Frene value 2
500 cm/H)k'',)0'H,:'
Examples 1 to 2 except that 1 part compounded 11 stopper was used.
(Comparative Example 2)

Furthermore, Table 1 shows the visual test results obtained for the cement molded bodies that were treated in Examples 1 and 2, except that the powder used in Comparative Example 2 was used alone as a filler. Comparative Example 3).

[Human] Visual test evaluation method O: Good △: Slightly poor ×: Poor Example 3 Comparative Examples 4 to 5 A roof tile was used for cement 1 as a cement molding, and after sealing the surface with cement paste, before glazing. The experiment was carried out in the same manner as in Example 2, except that it was then dried (110° C. for 13 hours), and the visual test results are shown in Table 2 as Example 3 and Comparative Example 4, respectively.

Furthermore, the cement molded body used in Example 3 was
The treatment was carried out in accordance with Example 3 except that the IJ visual test results were shown in Table 2 as Comparative Example 5.

Evaluation method of human λ visual test Same effect as shown in Table 1> As described above, the present invention, after rubbing cement into the cement I molded body, immediately before glazing) L2 m, then glazing and firing, There are no glazes, pinholes, or wrinkles on the glaze surface, and there are no small bubbles concentrated on the 711 surface after firing, resulting in a beautiful glaze surface.
-Karu. Therefore, the glazed cement product according to the present invention is suitable as a bald material product.

Claims (2)

[Claims] (1) A method for manufacturing a glazed cement product, which is characterized in that when manufacturing a glazed cement product, a cement molded body is sealed with cement, dried, then glazed and fired. (2) A method for manufacturing a glazed cement product according to claim 1, characterized in that cement paste is rubbed into a cement molded product when sealing with cement.