JPH032827B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention relates to a method for producing a glazed calcium silicate body,
In particular, the present invention relates to a method of forming a hard ceramic coating on the surface of a xonotrite calcium silicate plate that is hard to peel off and is hard. [Prior Art] Zonotrite calcium silicate plates have features such as being lightweight and having excellent fire resistance, and have been effectively used as heat insulating materials and the like. [Problems to be Solved by the Invention] Hitherto, surface-decorated zonotritic calcium silicate plates have not been provided, and when zonotritic calcium silicate plates are used in buildings as heat insulating materials, etc., it is difficult to install them. There were drawbacks such as the need to further apply a surface finishing material on the surface, requiring a large number of construction steps and making the work complicated. [Means for Solving the Problems] In view of the above-mentioned circumstances, the present invention has been made to provide a method for applying a good surface decoration to a xonotrite calcium silicate molded body, and the present invention is to provide a method for applying a good surface decoration to a xonotrite calcium silicate molded body. is 65 to 76% by weight, and the viscosity is
A glaze of 1000~8500cp is applied to a xonotrite calcium silicate molded body, and then heated at 100~150℃.
The gist of this invention is a method for producing a glazed calcium silicate body, which is characterized by drying the body at a temperature of 800 to 1000°C and then firing it for 0.1 to 10 hours. That is, the present inventors first used xonotrite calcium silicate molding as a surface finishing material because glazed tiles are highly durable, very beautiful, and give a sense of luxury. It was surmised that if this glaze could be applied to the body, it would be possible to obtain an extremely excellent building material that is excellent as a heat insulator and has a beautiful surface with a luxurious feel. Therefore, we investigated a method for producing a glazed calcium silicate body by applying a glaze treatment to a zonotrite calcium silicate molded body, but in the case of ceramic tiles, the water absorption rate of the molded body at the time of glazing is 5 to 5.
In contrast, xonotrite calcium silicate moldings have a water absorption rate of 150 to 200%, so it was found difficult to apply the glaze applied to ordinary ceramic tiles as is. . That is, if a normal glaze is applied as is, a good glazed surface cannot be obtained, and cracks, pinholes, etc. are unavoidable. As a result of further research on these points, the present inventors found that a glaze with a specific moisture content and a specific viscosity can be well applied to a xonotrite calcium silicate molded body, and completed the present invention. . The present invention will be explained in detail below. In the present invention, the zonotrite calcium silicate molded body to be glazed is prepared by kneading silicic raw material powder, calcareous raw material powder, water, and if necessary fireclay, asbestos, binder, etc., molding, and curing. It can be easily manufactured by producing xonotlite. In this case, as the molding method, any of the known paper forming methods, extrusion methods, press molding methods, etc. can be employed. In the method of the present invention, the glaze applied to the thus obtained xonotrite calcium silicate molded body has a total water content of 65 to 76% of the total solid content.
% by weight and a viscosity of 1000 to 8500 cp is used. If the total amount of water based on the total solid content of the glaze is less than 65% by weight or if the viscosity exceeds 8,500 cp, a smooth glazed surface will not be obtained and a large number of pinholes will occur, which is undesirable. On the other hand, if the total water content relative to the total solid content of the glaze is more than 76% by weight or if the viscosity is less than 1000 cp, the glaze will drip to the sides, or in severe cases, it will even spread to the back side, resulting in a good product. Cannot be glazed. Therefore, in the present invention, a glaze having a water content and viscosity within the above range is used. Such a glaze can be easily produced by appropriately adjusting the water content in a normal glaze preparation method. By the way, the total amount of water relative to the total solid content used in the present invention is 65 to 76% by weight, and the viscosity is 1000 to 1000.
The 8500 cp glaze is not necessarily suitable for mass production because it has a high water content and low viscosity, so the solid particles settle at a high rate, making it difficult to store stably for a long period of time. Therefore, in implementing the present invention, in advance,
A stable glaze with a relatively low water content and high viscosity is prepared, and just before glazing, water is added to this glaze and kneaded again to prepare a glaze with a water content and viscosity within the above range. is preferred. In this case, the glaze prepared in advance must have a total water content of 62% by weight or less based on the total solid content, and a viscosity of
A glaze of 13,000 cp or more is particularly preferred from the viewpoint of stability, kneading ability when water is added during use, reproducibility of glaze characteristics, etc. In the present invention, a xonotrite calcium silicate molded body is glazed with a glaze by spraying, brushing, etc., then dried at 100 to 150°C, and then fired at a maximum temperature of 800 to 1000°C for 0.1 to 10 hours. In particular, in the present invention, by drying at 100 to 150°C for 3 hours or more and then firing at 800 to 1000°C, it is possible to produce a glazed calcium silicate body that is extremely beautiful and has high properties. Note that the crystal shape of the xonotrite calcium silicate molded body changes to wollastonite at around 780℃, but the characteristics such as lightness and fire resistance required as a building material are
It will not be affected in any way. [Example] Examples will be described below. Example 1 100 parts by weight of fritted glaze, 5 parts by weight of clay and the first
Add the amount of water shown in the table to each pot mill, and
After mixing for 3 hours, 20 parts by weight of CMC 2% by weight solution was added and mixed for 1 to 2 hours to prepare glazes No. 1 to No. 10 having the total water amount and viscosity shown in Table 1. This glaze
No. 1 to No. 10 were each glazed onto a xonotrite calcium silicate molded body by spraying, dried at 120°C for 3 hours, and then fired at 950°C for 1 hour. Table 1 shows the observation results of the surface condition after each glazing and after firing.

[Table] From Table 1, it is clear that the total amount of water relative to the total solid content is 65-76% by weight, and the viscosity is 1000-1000%.
By using 8500 cp glaze (No. 7 to 10), a good glazed surface can be obtained. Example 2 Glazes No. 1 to No. 7 prepared in Example 1 were
Each sample was placed in a beaker and allowed to stand at 20°C to examine its stability. The results are shown in Table 2. From Table 2, it is clear that in the glazes No. 3 to No. 7 with a total water content exceeding 62% by weight, the particles settle quickly, and the amount of sedimentation is extremely large after 7 days of standing. . However, even if these glazes were stirred again, they did not return to their original state and had denatured into a foreign glaze. In contrast, the total water content is 62% by weight or less, the viscosity is
It was confirmed that items of 13,000 cp or higher (No. 1, No. 2) can be stored stably for a long period of time.

[Table] Example 3 The No. 1 glaze prepared in Example 1, that is, the glaze with the following composition and physical properties, was allowed to stand for the period shown in Table 3, and then applied to a xonotrite calcium silicate molded body. Immediately before glazing, 13.75 parts by weight of water was added and kneaded again to obtain a glaze having the total water amount and viscosity shown in Table 3, and glaze was applied by spraying using this glaze. Glaze No. 1 Fritz 100 parts by weight Clay 4 Water 40 CMC 2% solution 20 Total water 57.1% by weight Viscosity 27500cp Table 3 shows the workability of glazing and the condition of the glazed surface after glazing. From Table 3, total water content is 62% by weight or less, viscosity
Create a glaze of 13000 cp or more, and just before using it, add water and knead it again.
It is clear that glazes with the total water content and viscosity specified in the present invention can be obtained with good reproducibility. The obtained glazed zonotrite calcium silicate molded body was dried at 120°C for 8 hours, and the maximum temperature was 900°C.
When the materials were held at ℃ for 60 minutes and fired, glazed calcium silicate bodies with extremely beautiful glazed surfaces could be obtained.

[Table] [Effects of the Invention] As detailed above, the method for producing the glazed calcium silicate body of the present invention is such that the total water content relative to the total solid content is 65 to 65%.
A glaze of 76% by weight and a viscosity of 1000 to 8500 cp is applied to a xonotlitic calcium silicate molded body, then dried at 100 to 150°C, and then heated to the maximum temperature.
It is fired at 800 to 1000℃ for 0.1 to 10 hours, and can easily glaze zonotrite calcium silicate molded bodies, which are lightweight, have excellent fire resistance, and are extremely useful as building materials, etc., with good glazing workability. can be formed. The glazed surface thus formed is extremely smooth, free of pinholes, cracks, etc., and has extremely good properties. Furthermore, since the water content and viscosity of the glaze are controlled during glazing, the quality of the glaze is stabilized and there is no variation in product quality due to glaze lots. Therefore, according to the present invention, a beautiful xonotrite surface decorative material can be obtained, and when applied as a building material, workability is significantly improved.

Claims (1)

[Claims] 1. The total amount of water relative to the total solid content is 65 to 76% by weight.
A glaze with a viscosity of 1000 to 8500 cp is applied to a xonotrite calcium silicate molded body, then dried at 100 to 150°C, and then heated to a maximum temperature of 800 to 850°C.
A method for producing a glazed calcium silicate body, which is characterized by firing at 1000°C for 0.1 to 10 hours. 2 Add water to a glaze with a total water content of 62% by weight or less based on the total solid content and a viscosity of 13,000 cp or more just before glazing, and knead it to create a glaze with a total water content of 65 to 75% by weight based on the total solid content, and The manufacturing method according to claim 1, characterized in that the xonotrite calcium silicate molded body is glazed with a glaze having a viscosity of 1000 to 8500 cp.