JP2962423B2 - Glazed compact, method for producing glaze compact and method for producing glaze compact - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a zonotorite-based calcium silicate molded product suitable for glaze treatment, a method for producing the same, and a method for producing a glaze molded product obtained by subjecting the molded product to glaze treatment. is there.

[Prior Art] A zonotorite-based calcium silicate molded article has features such as excellent fire resistance and high strength for a light weight. However, since the zonotorite-based calcium silicate molding has drawbacks such as a high water absorption and the surface aesthetics are not so good, when the zonotorite-based calcium silicate molding is used as a building material, the zonotorite-based silicate molding is used. Another material with a finished surface had to be applied anew to the top surface of the calcium compact.

For the purpose of compensating for the above-mentioned drawbacks, there have been studies to try to obtain a material with aesthetic appearance of the surface while applying a glaze treatment to the surface of the zonotorite-based calcium silicate to prevent water absorption. Have been.

However, since the zonotorite-based calcium silicate compact has a high water absorption rate, the glaze method using a normal glaze used for ceramic tiles requires that the glaze be uniformly applied on the zonotorite-based calcium silicate compact. However, there is a problem that it is not easy to obtain a glazed product.

Therefore, as one measure to solve this problem,
JP-A-63-25283 discloses a method of glazing with a glaze having a large amount of water, further, a method of glazing a sufficiently absorbed zonotorite-based calcium silicate compact, and a material such as methylcellulose having a high water retention property. There is also a method of mixing a large amount of this into the glaze.

[Problems to be Solved by the Invention] However, a method of using a large amount of water at the time of glazing a zonotolite-based calcium silicate molded body requires a large amount of energy in a subsequent sintering step and requires a long time, which is not desirable. .

Also, the method of changing the composition of the glaze has problems that the conventional glaze method cannot be used, and that a defect newly generated due to a substance which has to be added separately to change the properties of the glaze is generated. .

The present invention has excellent properties such as heat resistance, fire resistance, light weight, lightness, and compressive strength, as well as water impermeability of the material surface, and a calcium silicate molded article for glaze that can be widely used as a building material having both aesthetic properties and An object of the present invention is to provide a method for producing the same and a method for producing a glazed molded product obtained by applying a glaze treatment to this molded product.

When performing a glaze treatment on a zonotolite-based calcium silicate molded product, the extremely high water absorption rate of the zonotolite-based calcium silicate-based product makes it easy to generate pinholes on the surface of the glazed molded product, and the product surface is also smooth. Problems such as worsening occur. So far, the composition of glaze and the method of glazing have been improved to solve the above problems.However, the glaze for ceramic tiles currently used has a well-balanced blend at present. , So refining one point creates other issues,
No improvements have been made to satisfy all aspects.

The present inventors presumed that based on the above-described circumstances, if the water absorption rate of the zonotolite-based calcium silicate molded body was close to that of the ceramic tile molded body, good results could be obtained. As a result of further research, the zonotorite-based calcium silicate molded body produced by mixing a specific amount of silicone oil in the raw material has almost the same water absorption rate as the ceramic tile, and after firing the glaze, The inventors have found that a glaze surface can be obtained, and have reached the present invention.

[Means for Solving the Problems] That is, the present invention is a glazed molded article characterized by being a zonotolite-based calcium silicate molded article containing 0.04 to 0.2% by weight of silicone oil composed of dimethylsiloxane or a derivative thereof, In a method for producing a zonotorite-based calcium silicate molded body using a powdery siliceous raw material and a calcareous raw material as main raw materials, a slurry mixture of the main raw materials is mixed with a silicone oil composed of dimethylsiloxane or a derivative thereof, with a total solid content of 100 parts by weight. A method for producing a glaze molded body, characterized by adding 0.05 to 0.22 parts by weight,
A method for producing a glazed molded body characterized by glazing a zonotorite-based calcium silicate molded body containing 0.04 to 0.2% by weight of silicone oil composed of dimethylsiloxane or a derivative thereof, followed by firing at 800 ° C to 1100 ° C. .

The silicone oil to be added to the raw material is a feature of the present invention, and has various properties, but the one that is effective in the method of the present invention is a silicone oil composed of dimethylsiloxane or a derivative thereof. The structural formula of dimethylsiloxane is (Wherein n represents a numerical value of the degree of polymerization having a viscosity at 25 ° C. of 10,000 cs or less.) It is composed of a derivative substituted with ether, olefin, epoxy group, fluorine, α-methylstyrene or alcohol, and preferably has a viscosity at 25 ° C. of 10,000 cs or less.

[Action] In the method for producing a glazed calcium silicate molded product according to the present invention, it is specified that 0.05 to 0.22 parts by weight of silicone oil composed of dimethylsiloxane or a derivative thereof is added to 100 parts by weight of the total solid content. However, in this case, the amount of dimethylsiloxane or a derivative thereof added is 0.
If the content is less than 05 parts by weight, that is, if the content is less than 0.04% by weight, the water absorption rate of the zonotorite-based calcium silicate molded article is still too high, so that pinholes are easily generated on the product surface, and the smoothness of the glaze surface after firing the glaze product is low. Because they are easily lost,
If the addition amount of the silicone oil exceeds 0.22 parts by weight, that is, the content exceeds 0.2% by weight, the water repellency on the surface of the zonotolite-based calcium silicate molded article becomes too high, and the glaze drips to the side, and the glaze before firing. This is because defects such as glaze shrinkage due to weakening of the adhesive force between the substrate and the base material are likely to occur. Further, the viscosity of the raw material mixture was measured at 40 ° C. using a rotor viscometer (manufactured by Rion) at 100 cp.
The above is desirable. If the viscosity is less than 100 cp, the silicone oil separates and uniform dispersion cannot be expected. When the viscosity is insufficient, a thickener such as bentonite, polyvinyl alcohol, cellulose or the like can be added and adjusted as needed.

The high-temperature and high-pressure steam curing may be performed by using saturated steam at 170 ° C. to 240 ° C. until zonotrite crystals are sufficiently generated.

Further, in the present invention, the calcination temperature is set to 800 ° C. to 1100 ° C., when the calcination temperature is less than 800 ° C., when a dehydration treatment is performed on the zonotolite calcium silicate molded body, steam generated from the zonotolite calcium silicate molded body is generated. This is because bubbles remain in the glaze layer, and if the firing temperature exceeds 1100 ° C, the compact will shrink significantly, which will easily cause deformation of the product and cracks on the finished surface, and use as a building material Is difficult.

The glaze used in the present invention preferably has a softening temperature of 800 ° C. or higher in order to avoid foaming due to dehydration of zonotolite.

On the other hand, as a glaze method, any of the conventional methods such as spraying, pouring, brush coloring, etc. can be used.

 The glazed compact is fired in a conventional heating furnace.

[Example] An example of the present invention will be described below.

48 parts by weight of silica powder, 10 parts by weight of Portland cement, 10 parts by weight of powdered lime, and 32 parts by weight of slaked lime are solids, and 100 parts by weight of this solid content is 65 parts by weight of water. And 0.1 parts by weight of a silicone oil composed of dimethylsiloxane are added and stirred to form a slurry, and then a slurry obtained by adding 0.065 parts by weight of metal aluminum powder to 100 parts by weight of solid content is poured into a mold and foamed. After curing, 220
A high-temperature and high-pressure steam curing treatment was performed at 12 ° C. for 12 hours to obtain a zonotorite-based calcium silicate compact.

60cm from this zonotoritic calcium silicate compact
Cut out a board with a size of 3 cm in thickness and a corner, and frit glaze (manufactured by Nippon Frit Co., Ltd., part number PT-5001)
90 parts by weight, 10 parts by weight gairome clay, glaze composed of water 50 parts by weight, surface area 1 m ² per substrate, using a spray as the glaze solids of 2kg glazed, pins for glazed surface of the substrate before firing We investigated the presence of holes, the smoothness of the finished product surface, and the glaze dripping on the side and back surfaces of the substrate. Thereafter, the glazed substrate was baked at 900 ° C. for 2 hours to obtain a glazed molded product. The glazed molded product was evaluated for occurrence of pinholes on the product surface and smoothness of the finished surface. The occurrence of glaze shrinkage was investigated. Table 1 shows the results.

As is evident from Table 1, in the sample having a silicone oil content of less than 0.04% by weight based on the total solid content, pinholes are generated on the surface of the product and the smoothness of the product surface is poor. However, in the glazed molded product containing the silicone oil composed of dimethylsiloxane in the range of 0.04 to 0.2% by weight, a good glazed surface is obtained. The content of silicone oil composed of dimethylsiloxane is 0.2
Defects such as sagging of the glaze and shrinkage of the glaze were observed in the samples exceeding the weight%.

In the present invention, the content of silicone oil was determined from the amount of methane gas generated when the sample was heated to 950 ° C. using a gas chromatograph.

As described above, when the present invention was carried out, a molded article having a water absorption rate suitable for the glaze treatment and having a good glaze surface was easily obtained.

[Effects of the Invention] As is clear from the description, the glazed surface can be easily formed on the zonotorite-based calcium silicate molded article by using the usual glaze and glazing method according to the present invention. The glazed surface of the obtained molded article has excellent smoothness and good properties without defects such as pinholes. Therefore, it can be said that this product has eliminated the disadvantages of water absorption and aesthetics while maintaining the excellent properties of the zonotolite-based calcium silicate molded article, such as light weight, heat insulation, and fire resistance. With the promise of a wide range of applications, there are significant contributions to the industry.

Claims (3)

(57) [Claims] 1. A glazed molding comprising a zonotoritic calcium silicate molding containing 0.04 to 0.2% by weight of silicone oil comprising dimethylsiloxane or a derivative thereof. 2. A method for producing a zonotorite-based calcium silicate molded product comprising a powdery siliceous raw material and a calcareous raw material as main raw materials, wherein dimethylsiloxane or a derivative thereof is added to a slurry mixture prepared by adding water to the main raw materials. Silicone oil, based on 100 parts by weight of the total solid content, 0.0
A method for producing a molded article for glazing, comprising a step of adding 5 to 0.22 parts by weight. 3. A zonotolite-type calcium silicate molded product containing 0.04 to 0.2% by weight of a silicone oil comprising dimethylsiloxane or a derivative thereof is glazed, and the glazed zonotolite-type calcium silicate molded product is heated to 800 ° C. to 1100 ° C.
A method for producing a glazed molded body, characterized by firing at ℃.