JPH03295853A - Formed body to be glazed, production of the same and production of glazed formed body - Google Patents

Abstract

PURPOSE:To obtain the formed body to be glazed excellent in such characteristics as heat resistance, refractoriness, lightness, handiness and compressive strength by forming the body from xenotlite calcium silicate contg. a specified amt. of silicone oil consisting of dimethylsiloxane (derivative). CONSTITUTION:A silicone oil consisting of dimethylsiloxane or its derivative is added by 0.05-0.22wt.%, based on the total solid, to an aq. slurry mixture of the powdery siliceous material and calcareous material as the essential raw material. Meanwhile, the viscosity of the mixture measured at 40 deg.C by a rotor- type viscometer is preferably controlled to <=1300cp. The obtained formed body is glazed and then aged by steam at high temp. and pressure by the saturated steam at 170-240 deg.C until a xenotlite crystal is sufficiently formed. The aged formed body is then burned at 800-1100 deg.C to obtain the glazed formed body.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a xonotrite calcium silicate molded body suitable for glazing treatment, a method for producing the same, and a method for producing a glazed molded body by subjecting the molded body to glazing treatment. be.

[Prior Art] A xonotrite calcium silicate molded body has characteristics such as excellent fire resistance and high strength despite its light weight. However, since xonotlitic calcium silicate molded bodies have drawbacks such as high water absorption and poor surface appearance, when using xonotolitic calcium silicate molded bodies as building materials, Another material with a finished surface had to be applied on top of the calcium compact.

In order to compensate for the above-mentioned drawbacks, conventional research has been carried out to prevent water absorption by applying a glaze treatment to the surface of xonotrite calcium silicate moldings, as well as to obtain a material that also has an aesthetically pleasing surface. has been done.

However, since the xonotlitic calcium silicate molding has a high water absorption rate, the glaze application method using the usual glaze used for ceramic tiles does not allow the glaze to be uniformly applied onto the xonotlitic calcium silicate molding. There was a problem in that it was not easy to apply the glaze, and it was not easy to manually apply the glaze.

Therefore, as a way to solve this problem, Japanese Patent Application Laid-Open No. 63-25283 discloses a method of applying a glaze with a large amount of water, and furthermore, a method of applying a glaze with a large amount of water is disclosed. Other methods include applying glaze to the glaze and mixing a large amount of a highly water-retaining material such as methyl cellulose into the glaze.

[Problems to be Solved by the Invention] However, the method of using a large amount of water during the glazing treatment of the xonotrite calcium silicate molded body is not desirable because it requires a lot of energy and takes a long time during the subsequent firing process. .

Furthermore, the method of changing the composition of the glaze has problems such as not only making it impossible to use the conventional glazing method, but also creating new defects caused by substances that must be added separately to change the properties of the glaze. .

The present invention provides a calcium silicate molded body for glazing that can be widely used as a building material that has excellent properties such as heat resistance, fire resistance, light weight, convenience, and compressive strength, as well as a water-impermeable material surface and good appearance. It is an object of the present invention to provide a method for producing the same and a method for producing a glazed molded body by subjecting this molded body to a glazing treatment.

When glazing a xonotlitic calcium silicate molded body, the extremely fast water absorption rate of the xonotlitic calcium silicate molded body tends to cause pinholes on the surface of the glazed molded body, and the smoothness of the product surface also deteriorates. Problems such as deterioration occur. In the past, efforts have been made to improve the glaze composition and glazing method in order to solve the above problems, but the glazes currently used for ceramic tiles currently have a well-balanced composition. Therefore, if one point is improved, other problems arise, and improvements that satisfy all points have not been made.

Based on the above-mentioned circumstances, the present inventors inferred that good results could be obtained by bringing the water absorption rate of the dry calcium silicate molded body closer to that of the ceramic tile molded body, and As a result of further research on this point, we found that xonotrite calcium silicate molded bodies made by mixing a specific amount of silicone oil into raw materials have almost the same water absorption rate as ceramic tiles, and that after glazing and firing, It was discovered that a good glazed surface could be obtained and the present invention was developed.

[Means for Solving the Problems] That is, the present invention provides a xonotrite calcium silicate molded body for glazing, which contains 0.04 to 0.2% by weight of silicone oil made of dimethylsiloxane or a derivative thereof. In a method for producing a molded body and a xonotrite calcium silicate molded body whose main raw materials are a powdered silicate raw material and a calcareous raw material, a silicone oil made of dimethylsiloxane or a derivative thereof is added to a slurry mixture of the main raw materials in a completely solid state. 0°05 to 100 parts by weight
A method for producing a molded body for glazing, characterized by adding 0.22 parts by weight of silicone oil, and glazing a xonotrite calcium silicate molded body containing 0.04 to 0.2% by weight of silicone oil made of dimethylsiloxane or a derivative thereof. After that, 8
A method for producing a glazed molded body characterized by firing at a temperature of 00°C to 1100°C.

The silicone oil added to the raw material is a feature of the present invention and has various properties, but the silicone oil that is effective when used in the method of the present invention is silicone oil made of dimethylsiloxane or its derivatives. The structural formula of dimethylsiloxane is (the blank space below this page) CH3 CH3 CH3 CH3-3i -0-3i -0-S 1-CH3CH
3CH3CH3 (in the formula, n indicates the numerical value of the degree of polymerization with a viscosity of 10,000 cs or less at 25°C), and dimethylsiloxane derivatives are those in which part or all of the H of the methyl group in the above formula is an amino group, It consists of a derivative substituted with polyether, olefin, epoxy group, fluorine, α-methylstyrene, or alcohol, all of which have 25
The viscosity at °C is preferably 10,000 cs or less.
).

[Function] In the method for producing a glazed calcium silicate molded body according to the present invention, 0.05 to 0
．． It stipulates that 22 parts by weight of silicone oil consisting of dimethylsiloxane or its derivatives be added;
In this case, the amount of dimethylsiloxane or its derivative added is less than 0.05 parts by weight, that is, the content is 0.04% by weight.
If it is less than 100%, the water absorption rate of the xonotrite calcium silicate molded product is still too fast, and pinholes are likely to occur on the product surface, and the smoothness of the glazed surface after firing the glazed product is likely to be lost. If the amount added exceeds 0.22 parts by weight, that is, the content exceeds 0.2% by weight, the water agitation properties on the surface of the xonotrite calcium silicate molded product will become too high, causing the glaze to drip to the sides or cause problems before firing. This is because the adhesive force between the glaze and the base material is weakened, making it easier for defects such as glaze curling to occur. Furthermore, the viscosity of the raw material mixture was measured at 40°C using a rotor viscometer (manufactured by Rion Corporation).
It is desirable that the measured value is 100 cp or more, and the viscosity is 1
If it is less than 0.0 cp, the silicone oil will separate and uniform dispersion cannot be expected. If the formulation lacks viscosity, a thickener such as bentonite, polyvinyl alcohol, or cellulose may be added as necessary.

The high temperature and high pressure steam curing may be carried out using saturated steam at 170°C to 240°C until xonotlite crystals are sufficiently formed.

Furthermore, the reason why the firing temperature is set to 8006C to 11000C in the present invention is that if the firing temperature is lower than 8006C, water vapor generated from the xonotlitic calcium silicate molded body will not be absorbed into the glazed layer when dehydrating the xonotlitic calcium silicate molded body. This is because air bubbles remain inside the product, and if the firing temperature exceeds 1100°C, the molded product will significantly shrink, easily causing product deformation and cracks on the finished surface.
This is because it becomes difficult to use it as a building material.

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 the xonotlite.

On the other hand, as the glazing method, any conventional method such as spraying, pouring, brushing, etc. can be used.

The glazed molded body is fired in a conventional heating furnace.

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

The solid content is 48 parts by weight of silica powder, 10 parts by weight of Portland cement, 10 parts by weight of powdered quicklime, and 32 parts by weight of slaked lime, and for 100 parts by weight of this solid content,
Add and stir 65 parts by weight of water and 0.1 part by weight of silicone oil consisting of dimethylsiloxane to form a slurry,
After that, a slurry in which 0.065 parts by weight of metal aluminum powder was added to 100 parts by weight of solid content was injected into the mold and foamed and hardened, followed by high-temperature and high-pressure steam curing treatment at 220 ° C. for 12 hours. A xonotrite calcium silicate molded body was obtained.

60cm from this xonotrite calcium silicate molded body
Cut out a board with a square shape and a thickness of 3 cm, and coat one main surface of the board with Frit glaze (manufactured by Nippon Frit Co., Ltd., product number PT-5).
001) A glaze consisting of 90 parts by weight, 10 parts by weight of frog's eye clay, and 50 parts by weight of water was applied to 2k per m2 of surface area of the substrate.
The glaze was applied using a spray with a solid content of glaze of g, and the presence or absence of pinholes on the glazed surface of the substrate before firing, the smoothness of the finished surface of the product, and the sagging of the glaze on the sides and back of the substrate were investigated. Ta. After that, the above glazed substrate was
A glazed molded product was obtained by firing at 0°C for 2 hours. Regarding this glazed molded product, check the occurrence of pinholes on the product surface, smoothness of the finished surface, and occurrence of glaze curl. We conducted an investigation. The results are shown in Table 1.

(Hereinafter, this page margin) As is clear from Table 1, in samples where the silicone oil content was less than 0.04% by weight based on the total solid content, pinholes were observed on the surface of the product, and The smoothness of the surface of the product is also poor, however, good glazed surfaces are obtained in glazed molded articles containing silicone oil consisting of dimethylsiloxane in a range of 0.04 to 0.2% by weight. In addition, in samples in which the content of silicone oil made of dimethylsiloxane exceeded 0.2% by weight, defects such as sagging of the glaze and warping of the axis were observed.

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

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

(Hereinafter, in the margin of this page) [Effects of the Invention] As is clear from the description, the present invention makes it possible to easily form a glazed surface on a xonotrite calcium silicate molded body using a conventional glaze and glazing method. Furthermore, the glazed surface of the obtained molded product has excellent smoothness and has good properties without defects such as pinholes. Therefore, it can be said that this product retains the excellent properties of xonotrite calcium silicate compacts, such as light weight, heat insulation, fire resistance, and strength, while eliminating the drawbacks of water absorption and aesthetics, making it suitable as a building material. Since it can be expected to be widely applied, it will greatly contribute to this industry.

that's all

Claims (3)

[Claims] 1. A molded article for glazing, characterized in that it is a xonotrite calcium silicate molded article containing 0.04 to 0.2% by weight of silicone oil made of dimethylsiloxane or a derivative thereof. 2. In a method for producing a xonotrite calcium silicate molded body using a powdered silicic acid raw material and a calcareous raw material as main raw materials, a silicone oil made of dimethylsiloxane or a derivative thereof is added to a slurry mixture prepared by adding water to the main raw materials, 0.05 per 100 parts by weight of total solids
A method for producing a molded article for glazing, comprising the step of adding ~0.22 parts by weight. 3. After glazing a xonotrite calcium silicate molded body containing 0.04 to 0.2% by weight of silicone oil made of dimethylsiloxane or a derivative thereof, the glazed xonotrite calcium silicate molded body was heated at 800°C to 11% by weight.
A method for producing a glazed molded body, characterized by firing at 00°C.