JPH032830B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention relates to a glazed calcium silicate fired body, and particularly to a glazed calcium silicate fired body with improved surface hardness and impact resistance. [Prior Art] Zonotrite calcium silicate molded bodies have characteristics such as being lightweight and having excellent fire resistance, and have been effectively used as heat insulating materials and the like. Conventionally, zonotritic calcium silicate boards with a surface decoration have not been provided, and when zonotritic calcium silicate boards are used in buildings as insulation materials, etc., it is necessary to apply another surface finishing material on the construction surface. There were disadvantages such as the need for construction, the number of construction steps, and the complexity of the work. Therefore, the present inventor first decided to use xonotrite calcium silicate moldings as a surface finishing material, since glazed tiles are highly durable, very beautiful, and give a sense of luxury. If this glaze could be applied on top of the glaze, 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.
As a method for applying a good surface finish to a xonotlitic calcium silicate molded body, the total water content is 65 to 76% by weight based on the total solid content, and the viscosity is 1000 to 1000.
A method was discovered in which a xonotrite calcium silicate molded body was glazed with a 8500 cp glaze, dried at 100 to 150°C, and then fired at a maximum temperature of 800 to 1000°C for 0.1 to 10 hours. The application was filed (Japanese Patent Application No. 1983-154314. Japanese Patent Application No. 63-25283.
Hereinafter referred to as "prior application". ). According to the method of the prior application, a glazed calcium silicate body that is extremely useful as a building material, lightweight, has excellent fire resistance, and has a beautifully decorated surface can be obtained. Note that the crystal shape of the xonotrite calcium silicate molded body changes to wollastonite when fired (around 780℃), but there are no problems with the properties required as a building material (lightweight, fire resistance). There is no. [Problems to be solved by the invention] The glazed calcium silicate fired body obtained by the method of the prior application has an excellent finished surface and is a lightweight construction material with excellent fire resistance. It has the disadvantage of being weak against For this reason, when a hard object hits the surface of this glazed calcium silicate fired product, that part may crack and cave in. [Means for Solving the Problems] The present invention has been made to increase the surface hardness of a glazed calcium silicate fired body and improve its impact resistance, and includes cement mortar between the calcium silicate layer and the glaze layer. The gist of the present invention is a glazed calcium silicate fired body characterized by being provided with a layer. Such a glazed calcium silicate fired body of the present invention can be easily manufactured by providing a cement mortar layer on a xonotrite calcium silicate molded body, applying glaze on the cement mortar layer, and then firing. can. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The glazed calcium silicate fired body of the present invention will be described in detail below with reference to the drawings for its manufacturing method and operation. FIGS. 1A to 1D are cross-sectional views illustrating a method for manufacturing a glazed calcium silicate fired body of the present invention. In the present invention, the zonotrite calcium silicate molded body 1 (FIG. 1a) to be glazed is prepared by kneading silicic raw material powder, calcareous raw material powder, water, fireclay, asbestos, binder, etc. as necessary. It can be easily manufactured by molding and curing to produce 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 for producing a fired body of the present invention, a cement mortar layer 2 is formed on the surface 1a to be glazed of the xonotrite calcium silicate molded body 1 obtained in this way (FIG. 1b). To form the cement mortar layer 2, the surface 1a to be glazed of the calcium silicate molded body 1 is sufficiently moistened with water, and then cement mortar is applied. The cement mortar to be applied may be any commonly used cement mortar, and there are no particular restrictions on its composition, but for example, the following compositions are suitable. Cement: 100 parts by weight Aggregate: 50-500 parts by weight Methyl cellulose and other additives: 0-5 parts by weight Water: 30-60 parts by weight As for the aggregate to be mixed, it is preferable to use fire-resistant aggregate, such as siyamoto, anti-firestone, One or more of silica sand, xonotlite powder, etc. can be used. When xonotlite powder is used as the aggregate, it improves the adhesion between the xonotlite calcium silicate compact and the cement mortar layer,
Further, the specific gravity of the cement layer portion can be reduced. After applying cement mortar, it is cured and dried under normal conditions, and then glazed. In addition to forming the cement mortar layer by applying it to the calcium silicate molded body as described above, the cement mortar layer can also be formed at the same time when the calcium silicate molded body is molded. In this case, for example, xonotlite powder, white cement,
Pulp and water are mixed to form a slurry, which is then pressure-dehydrated and molded. A slurry that forms a mortar layer is placed on top of the slurry, and the slurry is further pressure-dehydrated and molded. Thereby, a xonotrite calcium silicate molded body with a cement mortar layer laminated thereon is obtained. In this case, the adhesion between the xonotrite calcium silicate molded body and the cement mortar layer becomes more reliable. In the present invention, if the thickness of the cement mortar layer to be formed is too thin, the effect of improving the hardness and impact resistance of the glazed surface will not be sufficiently improved. By setting the thickness of the cement mortar layer to 2 mm or more, a glazed calcium silicate fired body with excellent impact resistance can be obtained. On the other hand, if the cement mortar layer is too thick, the overall weight becomes heavy, and the advantage of the calcium silicate fired product as a lightweight building material is lost. A particularly preferred thickness of the cement mortar layer is 4
~10mm. On the surface of cement mortar layer 2, then glaze 3
glaze (Fig. 1c). As the glaze, a general glaze that is normally used for glazing tiles and the like can be used, and the glaze is applied to the surface of the cement mortar layer 2 by spraying, brushing, etc. After glazing, dry at 100-150℃ according to the usual method.
Next, it is baked at 600-900℃ for about 0.1-5 hours.
A glazed calcium silicate fired body 10 of the present invention can be obtained (FIG. 1d). The crystal shape of xonotrite calcium silicate compacts changes to wollastonite (4 in Figure 1 d) at around 780°C, but the characteristics such as lightness and fire resistance required as building materials are not met. , will not be affected in any way. [Example] Examples will be described below. Example 1 After sufficiently spraying water on the surface of a 500 mm x 500 mm x 20 mm thick xonotrite calcium silicate molded body, cement mortar of the following composition was applied to the surface to the thickness shown in Table 1. . Cement mortar composition (parts by weight) Cement 100 Aggregate (Shyamatsuto) 200 Methylcellulose 0.5 Water 50 The cement mortar layer was cured in the atmosphere for one day,
After drying at 120°C for 8 hours, a glaze having the following composition was sprayed onto the cement mortar layer. Glaze composition (parts by weight) Fritz 100 Clay 5 Water 40 CMC 2% by weight solution 20 After drying this at 120℃ for 8 hours, it was fired in a roller hearth kiln at 900℃ for 60 minutes to form a glazed calcium silicate. A fired body was obtained. Note that the thickness of the glaze layer was 0.4 mm. In addition, after firing,
Steam curing was performed for one day. The specific gravity of each fired body is as shown in Table 1. However, the specific gravity of the cement mortar layer was 2.0. The obtained glazed calcium fired body was placed on a sandy surface with the glazed side facing up, and a 25mmφ, 65g steel ball was dropped into the center from the height shown in Table 1, and the condition of the falling surface was examined. , tested its impact resistance. The results are shown in Table 1. Comparative Example 1 For comparison, a fired body was obtained in the same manner as in Example 1 except that no cement mortar layer was formed, and an impact test was conducted. The specific gravity and test results of the fired bodies are also listed in Table 1. Example 2 An example was carried out in which xonotlite powder was used as an aggregate for cement mortar. That is, a calcium silicate fired body was produced in the same manner as in Example 1, except that cement mortar having the following composition was used and this was applied to a thickness of 6 mm. Cement mortar composition (parts by weight) Cement 100 Shamoto 50 Zonotlite powder 50 Methyl cellulose 0.5 Water 50 Table 1 shows the specific gravity and impact resistance test results of the obtained fired bodies. In addition, when xonotlite powder was used as the aggregate of the cement mortar as in this example, the cement mortar layer and the xonotlite calcium silicate molded body were compatible with each other, and the adhesion and workability were extremely good. Furthermore, since the specific gravity of the cement mortar layer is small, the weight of the fired body can be reduced.

【table】

[Table] As is clear from Table 1, the glazed calcium silicate fired body of the present invention has extremely excellent impact resistance. [Effects of the Invention] As detailed above, the glazed calcium silicate fired body of the present invention has a cement mortar layer between the calcium silicate layer and the glaze layer. The hardness of the layer surface is increased and the impact resistance is significantly improved. Even if the thickness of this cement mortar layer is small, the effect can be sufficiently exerted, so that the specific gravity of the entire glazed calcium silicate fired body of the present invention can be kept small. Therefore, even if the size is increased, its handling is good. Therefore, the glazed calcium silicate fired body of the present invention is lightweight, has excellent fire resistance, is beautiful, and has excellent impact resistance, so it is extremely useful as a large, lightweight building material, etc.

[Brief explanation of the drawing]

FIGS. 1A to 1D are cross-sectional views illustrating a method for manufacturing a glazed calcium silicate fired body of the present invention. 1... Zonotolitic calcium silicate molded body,
2... Cement mortar layer, 3... Glaze, 4...
Wollastonitic calcium silicate fired body, 10...
...Glazed calcium silicate fired body.

Claims (1)

[Scope of Claims] 1. A glazed calcium silicate fired body, characterized in that a cement mortar layer is provided between the calcium silicate layer and the glaze layer. 2. The glazed calcium silicate fired body according to claim 1, wherein the cement mortar layer has a thickness of 2 mm or more.