JPH0248507B2 - NENDOKAWARARUINOHATSUSHOKUKAKOHOHO - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for coloring the surface of clay roof tiles, and provides a novel method for easily obtaining high-quality color and gloss without using sludge.

Traditionally, for example, clay tiles have discolored surfaces after firing.
In order to obtain a thin silver film that would not fade, a processing method was used in which the tile base was coated with a powder and fired.
There are many known examples such as No. 3962. However, the above-mentioned method of developing color using a yukyu-yaku requires time and effort to mix the yu-yaku, and has the disadvantage of high costs. A method is used in which the surface particles are polished to make them finer and more beautiful, and then fired to develop the silver luster of the ibushi tiles. However, this polishing process requires skill and effort, and is therefore extremely expensive. become.
On the other hand, "Hake-do" whose main ingredients are Frogme clay or Kibushi clay is commercially available, and there is also a known processing method in which the "Hake-do" is "brushed" onto the white base surface of roof tiles to give them color and luster. However, the coloring gloss is inferior and
There are drawbacks such as lack of stability and uniformity of coloring and gloss.

It is an object of the present invention to provide a new processing method that overcomes the above-mentioned conventional drawbacks and provides a high-quality color-emitting effect easily and inexpensively. That is, the present invention is characterized by a method in which a new "hake clay" devised as a result of many years of research by the inventor is applied in the form of a thin film to the white base surface of a roof tile, and then fired to produce color and emit light. Apply the "brush soil" shown below to the white base surface of clay roof tiles.
This is a processing method in which a thin film is applied by means such as "sprinkling,""brushing," or "immersion," and after drying, reduction firing or oxidation firing is performed to produce color and emit light.

●"Bake soil" used in the present invention A: Approximately 1.0 g to 2.0 g of humic acid is added to 5 c.c. to 10 c.c. of a sodium pyrophosphate solution (0.1 mol/) or 5 c. of a loaded soda solution (0.1 N). Dissolve in water at .c.~10c.c.
300 c.c. is added, and the diluted solution is adjusted to pH 7.5-8.0 by adding a small amount of sodium pyrophosphate solution or sodium chloride solution. Furthermore, water is added to the solution to produce a humic acid-containing solution having a total volume of 500 c.c.

B: Generate 100g of water droplets of Frogme clay or Kibushi clay.

C: The above A and B are sufficiently mixed and stirred to produce a mixed solution, and after standing for 5 to 10 hours, the supernatant liquid is collected to obtain "brush soil".

By the above-described coloring processing method of the present invention, reduction firing produces a silver luster, and oxidation firing produces a transparent luster, giving the surface of the clay tiles an excellent colored luster.

Next, one embodiment of the present invention will be described with reference to it.

The ingredients of "Hake soil" used in one example are as shown in the table below.

A': Dissolve 1.8 g of humin solution in 8 c.c. of sodium pyrophosphate solution (0.1 mol/), dilute by adding 300 c.c. of water, and then add 5 c.c. of the above sodium pyrophosphate solution. to obtain a solution with a pH of 7.8, and then add water to produce a humic acid-containing solution with a total volume of 500 c.c.

B': Generate 100 g of commercially available frog's eye clay water droplet.

C′: Stir and mix the above A′ and B′ and let stand for about 8 hours.
After that, the supernatant liquid is collected to produce "hake soil".

The "brush clay" was "brushed" onto the white tile base to form a thin, uniform film, and after drying, reduction firing or oxidation firing was performed.

The tiles according to the above embodiments have an extremely beautiful silvery luster or transparent luster, in contrast to tiles made using the conventional method, in which commercially available "hake clay" is applied to a white tile base and fired under the same conditions as described above. We were able to obtain a tile that stably exhibits

This is because when a thin film of the above-mentioned "hake clay", which uses humic acid, a hydrophilic organic polymer that has a protective colloid-like effect on clay particles, is applied to the white base of clay roof tiles, the clay is coated on the surface of the white base. The fine particles become preferably oriented in a thin film state, and when oxidized and fired in that state, a transparent hard film is produced, and when reduced and fired, carbon is beautifully oriented on the film,
It is thought to produce a silvery white luster.

Therefore, according to the method of the present invention, it is possible to obtain a more beautiful and stable colored luminescent surface of clay roof tiles, as compared to the conventional coloring process using the well-known "brush clay".

In the above structure of the present invention, even if humic acid is used in an amount exceeding the above-mentioned 1.0-2.0 g, for example, 3.0-4.0 g, the above-mentioned coloring and light-emitting effect can be expected. but,
From economical considerations, it is preferably about 1.0 to 2.0 g. However, if you deviate from each of the above values other than humic acid,
This is not preferable as peeling etc. may occur. On the other hand, since the thin film may peel off if it is touched by hands or the like during handling before firing, a small amount of chemical sizing agent (for example, commercially available cerogen) may be added to the "brush clay".

As described above, in the coloring processing method of the present invention, "brush clay" can be produced easily and inexpensively, and it is sufficient to simply apply it to the surface and bake it, and it is possible to obtain a beautiful and stable colored luster. Therefore, it is an extremely practical and useful coloring processing method.

Claims (1)

[Claims] 1 Dissolve a small amount of humic acid in a small amount of sodium pyrophosphate solution or sodium pyrophosphate solution, and add water
Add 300c.c. to generate a solution with a pH of 7.5 to 8.0.
Furthermore, water was added to the solution to produce a humic acid-containing solution with a total volume of 500 c.c., and the humic acid-containing solution was stirred and mixed with 100 g of water droplets of Frogme clay or Kibushi clay for 5 hours. After being allowed to stand still for ~10 hours, the supernatant liquid is collected to produce "hake-do", and the "bake-do" is applied in a thin film form to the surface of the white substrate, and then dried and fired to develop color. A method of coloring clay tiles.