JP2003147867A - Active china clay based building material having autonomous humidity conditioning function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a humidity conditioning building material and its manufacturing method capable of satisfying the compatibility between sufficient strength and humidity conditioning performance. SOLUTION: Humidity conditioning building material is obtained by using a raw material containing active China clay and by burning it at a temperature not lower than 500 deg.C which provides solidified bodies having a humidity conditioning performance, a high strength and an excellent humidity conditioning performance; and the active China clay is used independently or by mixing with other raw materials for ceramics and formed and burned. Its manufacturing method is also provided. Therefore, by adopting active China clay as humidity conditioning material, the burning becomes possible at a temperature higher than that of the conventional humidity conditioning material, and solidified bodies having sufficient strength and humidity conditioning performance can be produced by the burning.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an activated clay-based building material having an autonomous humidity control function that achieves both high strength and excellent humidity control performance. It has the function of ensuring a comfortable space by proper adjustment, and has the ability to express high strength in the material itself, mainly used for tiles for interior wall materials etc., high strength and excellent autonomous The present invention relates to a new activated clay-based building material having a humidity control function and a method for producing the same.

[0002]

2. Description of the Related Art In recent years, the living space is becoming more comfortable due to the improvement of heat insulation and the improvement of heating equipment. Internal dew condensation occurs on the outside of the material, rot fungi and the like multiply, and the strength of the wall material deteriorates. As a result, for example, the wall material cannot maintain sufficient strength against an earthquake disaster. is there. In addition, environmental control by these methods also causes allergic problems associated with the reproduction of mites and molds.
Furthermore, since these methods involve energy consumption, in addition to cost, the impact on the global environment cannot be ignored.

The artificial environment control by the heat insulating material or the heater as described above is intended to perform a predetermined temperature control in order to make the environment condition of high temperature and high humidity or low temperature and low humidity comfortable. For example, it is considered that a comfortable environment can be realized by just controlling the humidity. For these reasons, in recent years, the building material itself has a humidity control function, and the humidity of the room can be adjusted without the need for air conditioning equipment or electric power, and it is possible to obtain dew-proof and mildew-proof building materials. Is being developed. However, in the past, many materials have been developed as this type of humidity control material, but these materials have almost no ability to express strength in the material itself having a humidity control function, and in order to obtain sufficient strength. For example, various methods such as a method of blending a setting hardening agent such as gypsum and a method of baking at a high temperature have been adopted.

Among these methods, in the method of adding a setting hardening agent, since the material having a humidity control function deteriorates the reactivity at the time of hardening and the flow characteristics of the slurry, good strength,
In addition, it is difficult to obtain a material having humidity control performance. Further, in this method, since the reaction time is long and batch production is performed, it is not suitable for mass production, and in addition, it is relatively large-scaled and often requires special equipment. Among the methods described above, as a method of imparting strength to the humidity control material by a simple method without using special equipment, for example, a raw material of ceramics such as kaolinite clay powder is blended and mixed. Then, there is a method of molding and firing.

According to this method, the higher the firing temperature, the higher the strength of the humidity control material.
Since the fine pores of the humidity control material disappear and the humidity control function deteriorates, it is difficult to manufacture a member having sufficient strength to be used as a ceramic building material by such a process. (As these prior art documents,
JP 2001-173113 A, JP 2000-2036 A
49, JP 2000-202815, and JP 2000-0.
45450 and the like are exemplified). Due to such a trade-off, in the conventional technology, the fact is that the firing temperature is set while adjusting one or both of the strength and the humidity control performance, and therefore, in the technical field, There has been a strong demand to develop a new humidity control material having high strength and excellent humidity control performance.

[0006]

Under the circumstances, the inventors of the present invention, in view of the above-mentioned prior art, can control the humidity to satisfy both sufficiently high strength and excellent humidity control performance. As a result of various investigations of the materials and earnest studies, it was found that even if the activated clay is burned at a high temperature of 800 ° C, high humidity control performance is maintained, and high strength is added by the high temperature firing. The invention was completed. An object of the present invention is to provide a new humidity control building material having both high strength and excellent humidity control performance. Another object of the present invention is to provide a method for producing the humidity-controlled building material, which enables the humidity-controlled building material having the above characteristics to be efficiently produced by a simple method.

[0007]

To solve the above problems, the present invention comprises the following technical means. (1) A humidity control building material comprising a solidified body having high strength and excellent humidity control performance, which is obtained by firing a raw material containing activated clay at 500 ° C. or higher. A humidity control building material characterized by being mixed with another ceramic material, mixed, molded and fired. (2) The humidity control building material as described in (1) above, characterized in that activated clay is mixed with a ceramic raw material containing kaolinite clay powder. (3) The humidity-conditioning building material as described in (1) above, characterized in that activated clay is used alone or in combination with another ceramic raw material and is fired at 700 ° C to 900 ° C. (4) The humidity-conditioning building material according to (2), characterized in that activated clay is mixed with a ceramic raw material containing kaolinite clay powder and fired at 700 ° C to 900 ° C. (5) A method for producing a humidity-controlled building material, characterized in that activated clay is singly or blended with another ceramic raw material, mixed, shaped, and fired at 500 ° C. or higher. (6) The method for producing a humidity-conditioning building material as described in (5) above, wherein the activated clay is mixed with a ceramic raw material containing kaolinite clay powder. (7) The method for producing a humidity-controlled building material according to (5) above, which comprises firing at 700 ° C to 900 ° C.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Next, the present invention will be described in more detail. The present invention employs activated clay as a raw material for the humidity control material, and thereby enables firing at a higher temperature than conventional humidity control materials, and this high temperature firing provides high strength and excellent humidity control performance. The present invention is characterized in that a humidity-controlled building material comprising a solidified product is obtained. As the activated clay, the main constituent components are halloysite and acid-treated clay having montmorillonite as a main component such as bentonite,
Alternatively, those containing as a part of the constituents are also recognized and their use is not hindered, but in the present invention, acid clay treated with acid is preferably used. In the present invention, activated clay can be used alone or in combination with other ceramic raw materials in an appropriate ratio. In this case, other ceramic raw materials to be mixed with the activated clay are not particularly limited as long as the strength is exhibited by firing, but preferably, for example, kaolinite clay powder, porcelain stone, Examples of ceramic raw materials such as miscellaneous clay and refractory clay. Further, the blending ratio thereof can be appropriately adjusted in consideration of the strength and humidity control performance of a desired humidity control material. The present invention can remarkably improve the strength of a humidity control material by mixing activated clay alone or by mixing the kaolinite clay powder or the like as another ceramic raw material therein and firing it at a predetermined high temperature. Is possible.

In the method of the present invention, by mixing other ceramic raw materials with activated clay, the firing temperature is the same as that of a commercially available humidity control building material even at 500 ° C. in terms of solidification and stabilization by heating. However, in order to develop a higher strength, the firing temperature is 500 ° C. or higher,
The temperature is preferably 700 ° C. or higher, and as shown in the examples described later, the preferable range is up to 900 ° C. in view of the firing temperature at which the moisture absorption / release function of activated clay decreases.

In the method of the present invention, the above raw materials are mixed, shaped and fired. Any mixing method may be used as long as the raw materials can be mixed until they are uniform, and generally, Although dry mixing is used, wet mixing may be used. Examples of the molding method include extrusion molding, press molding, and casting molding. From the viewpoint of moldability and productivity, extrusion molding and press molding are suitable for mass production in a short time. It is also possible to form into a two-layer or multi-layer structure like Hishimochi by using the raw material obtained by mixing other ceramic raw materials with activated clay as the surface layer portion and the raw material as the base material for imparting strength as the inner layer portion or base portion. Therefore, the raw material cost can be reduced.

Further, in the present invention, as the above kaolinite clay powder, for example, clay kira which is a clay-based waste in the Seto region of Aichi prefecture (from clay raw ore, clay and silica sand which are raw materials for ceramics are removed. Even when the latter unnecessary portion) is used, a humidity control material having good moldability and strength, and excellent humidity control performance can be produced.

[0012]

In the present invention, by using activated clay as a raw material of the humidity control material, for example, 500 ° C. or higher,
Further, even if it is fired at a high temperature of 700 ° C. or higher, high humidity control performance is maintained and high strength is added, whereby a new humidity control building material that satisfies both high strength and excellent humidity control performance. Can be manufactured. According to the present invention, for example, as shown in Examples to be described later, for example, a sample fired at 800 ° C. gradually absorbs moisture from a relative temperature of 60% and has good humidity control properties as an autonomous humidity control building material. In addition to having high bending strength, it is useful as an autonomous humidity control building material.

[0013]

EXAMPLES Next, the present invention will be specifically described based on examples, but the present invention is not limited to the examples. Example 1 (1) Manufacture of humidity control material 10 g of distilled water was added to 100 g of activated clay and mixed well, then 11 g was weighed and put into a mold of 34 mm × 34 mm, and a load of 3 t was applied. Press molding was performed and this was dried at 105 ° C. to obtain a molded body. This was fired at a temperature between 300 ° C and 900 ° C to obtain a sample piece. These sample pieces were subjected to the following measurements.

(2) Moisture Absorption / Desorption Test Regarding the moisture absorption / desorption test of the obtained sample, as a pretreatment,
After processing the sample piece with aluminum seals on five sides, 25
It was saturated with moisture under the conditions of ° C and relative humidity of 50%. After holding this pretreated sample piece at 25 ° C. and 90% relative humidity for 24 hours, it was changed to 25 ° C. and 50% relative humidity,
The cycle of holding for 24 hours was repeated twice. Then, the value obtained by dividing the weight difference of the sample piece at the end of the moisture absorption process of the second cycle and the end of the moisture release process by the moisture absorption / release area was defined as the moisture absorption / release function. The measurement result is shown in FIG.
As is clear from FIG. 1, the high moisture absorption / desorption function is exhibited up to 800 ° C. firing, and the moisture absorption / desorption function is drastically lowered by firing at a higher temperature than that.

FIG. 2 shows the water vapor adsorption isotherm (25 ° C.) of the above sample baked at 800 ° C. As is clear from FIG. 2, it was found that the humidity was gradually absorbed from the relative humidity of 60%, and good humidity control characteristics could be maintained as an autonomous humidity control building material.

(3) Strength Test A three-point bending strength test of the obtained sample was carried out under the conditions of n number = 5, load speed 0.5 mm / m, and distance between fulcrums 20 mm. The measurement result is shown in FIG. As is clear from FIG. 3, it was found that high strength was added from 700 ° C. firing, and strength equivalent to that of a commercially available humidity control building material was obtained.

Example 2 (1) Production of humidity control material 300 g of activated clay was used as kaolinite clay powder,
A mixture of 500 g of clay kira of Seto region and 200 g of echinoida was mixed and pulverized in a ball mill for 9 hours, dried at 105 ° C., and sieved at 70 mesh to obtain a sample powder.
20 g of distilled water was added to 200 g of this sample powder, and after mixing well, 11 g was weighed and put into a 34 mm × 34 mm mold, and press molding was performed by applying a load of 3 t,
This was dried at 105 ° C. to obtain a molded body. This is 500
Firing was performed at a temperature of from 800 to 800 ° C to obtain a sample piece. These sample pieces were subjected to the following measurements.

(2) Strength test The measurement results of the three-point bending strength test of the obtained sample are shown in FIG. As is clear from FIG. 4, it can be seen that the strength is remarkably increased by firing at 800 ° C. or higher.

Comparative Example The moisture absorbing / releasing function of a commercially available humidity-conditioning building material was measured by the same method as in the examples of the present invention. The measurement results are shown in Table 1. As is clear from Table 1, in the sample of Example 2 of the present invention, 200 g /
It was found that it exhibits a moisture absorption / release function of m ² or more and has a humidity control performance superior to that of a commercially available humidity control building material.

[0020]

[Table 1]

[0021]

Industrial Applicability As described above in detail, the present invention uses a raw material containing activated clay and calcining the raw material at 500 ° C. or higher to obtain a solidified product having high strength and excellent humidity control performance. According to the present invention, there is provided a humidity control building material comprising activated clay, which is used alone or in combination with another ceramic raw material, and which is mixed, molded and fired, and a manufacturing method thereof. 1) Mixing a ceramic raw material such as kaolinite clay powder with activated clay and firing it to obtain 800
It maintains an excellent moisture vapor absorption and desorption function even when fired near ℃, and can obtain an autonomous humidity control building material with high strength added. 2) Activated clay, for example, almost kaolinite clay powder By mixing the clay killer of the Seto region, which is the body, and the Elephant frog, it is possible to produce and provide a thin humidity control building material with much higher strength than conventional ones,
3) Further, even if waste such as clay kira is used, it is possible to provide a humidity control building material that is comparable to the conventional humidity control building material,
4) The special effect that a new functional building material having high strength and excellent humidity control performance can be produced by using the existing production equipment such as ceramic tile as it is.

[Brief description of drawings]

FIG. 1 shows a relationship between a firing temperature and a moisture absorption / desorption function in a sample of an example of the present invention.

FIG. 2 shows a water vapor adsorption isotherm of a sample of an example of the present invention.

FIG. 3 shows the relationship between the firing temperature and the bending strength of the samples of the examples of the present invention.

FIG. 4 shows the relationship between the firing temperature and the bending strength of the samples of the examples of the present invention.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Shinji Watamura             Ari Prefecture Moriyama-ku, Nagoya             Dong 2266-98 National Institute of Advanced Industrial Science and Technology             Ryusho Chubu Center (72) Inventor Yasuo Shibasaki             Ari Prefecture Moriyama-ku, Nagoya             Dong 2266-98 National Institute of Advanced Industrial Science and Technology             Ryusho Chubu Center (72) Inventor Katsumi Yamada             16-20 Nishiki 1-chome, Naka-ku, Nagoya City, Aichi Prefecture             Lamic Building Materials Technology Research Association (72) Inventor Osamu Kato             16-20 Nishiki 1-chome, Naka-ku, Nagoya City, Aichi Prefecture             Lamic Building Materials Technology Research Association F term (reference) 2E001 DB03 FA06 FA10 HA14                 4G019 JA01

Claims (7)

[Claims] 1. A raw material containing activated clay is used.
A humidity control building material comprising a solidified body having high strength and excellent humidity control performance obtained by firing at 00 ° C or higher, wherein activated clay is used alone or in combination with other ceramic raw materials, and mixed, molded, Humidified building material characterized by being fired. 2. The humidity control building material according to claim 1, wherein activated clay is blended with a ceramic raw material containing kaolinite clay powder. 3. The humidity control building material according to claim 1, wherein activated clay is used alone or in combination with another ceramic raw material, and the mixture is fired at 700 ° C. to 900 ° C. 4. The humidity-controlled building material according to claim 2, wherein activated clay is mixed with a ceramic raw material containing kaolinite clay powder and fired at 700 to 900 ° C. 5. A method for producing a humidity-controlled building material, which comprises activating activated clay alone or blending it with another ceramic raw material, mixing, molding and firing at 500 ° C. or higher. 6. The method for producing a humidity-controlled building material according to claim 5, wherein activated clay is mixed with a ceramic raw material containing kaolinite clay powder. 7. The method for producing a humidity-conditioning building material according to claim 5, which comprises firing at 700 ° C. to 900 ° C.