method of porpsity ceramic

专利摘要:
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a porous ceramic, and more particularly to a method for producing a porous ceramic that can impart high porosity to a ceramic even when heat treated at a relatively low temperature. According to the present invention, bentonite is contained in 100 parts by weight of a mixture of 20 to 80% by weight of a diatomaceous earth or zeolite having a particle size of 150 μm or less, or a mixture of 20 to 80% by weight of glass powder having a particle size of 100 μm or less. Or 5 to 50 parts by weight of clay is added, and a method for producing a porous ceramic is characterized in that the heat treatment at about 750 ~ 850 ℃.
公开号:KR20000063100A
申请号:KR1020000036330
申请日:2000-06-29
公开日:2000-10-25
发明作者:최춘식
申请人:최춘식；
IPC主号:

专利说明:

Method of manufacturing porous ceramics {method of porpsity ceramic}
The present invention relates to a method of manufacturing a porous ceramic, and more particularly, to a method of manufacturing a new porous ceramic that can give a high porosity to the ceramic even when heat treatment at a relatively low temperature.
Porous ceramics are mainly used as artificial soils, various filters, nutrient cultivation media, microorganism carriers, heat insulating materials, repair materials, adsorbents, sorbents, and the like, and the performance of products is generally determined by their porosity. Such a porous ceramic is conventionally manufactured mainly by the following method.
One of the methods of manufacturing a conventional porous ceramic, the ceramic powder is heat-treated at a relatively high temperature of more than 1000 ℃ to cause the ceramic powder particles to sinter only at the contact surface and to be connected to each other only at the contact surface, so that the ceramic powder has particles There is a way to allow the liver space to exist as pores. However, according to this method, since the pore size of the ceramic is determined by the size of the glass particles used, and the open porosity depends on the state of charge of the glass particles, a porous ceramic having an open porosity of 35VoL% or more is determined by the general packing density theory. Is known to be almost impossible.
As another method of manufacturing a porous ceramic, there is a method of manufacturing a ceramic using only diatomaceous earth or zeolite having micropores in powder particles, but according to this method, the porosity of the ceramic is excellent, The cost was raised as needed.
As another method, there is a method of producing porous sintered glass using glass powder. This method has the advantage that it can be sintered even at low temperature, but the open porosity of the sintered body is lowered if it is maintained for a long time at the softening temperature of the glass during heat treatment or if the heat treatment temperature is higher than the glass softening temperature. However, when the sintered glass is manufactured, it is difficult to maintain the same surface temperature of the inside and outside of the sintered body, and thus, it is difficult to manufacture the sintered body having a high open porosity. In addition, since the glass powder is not plastic, there is a disadvantage in that a separate binder must be added in the molding process of the glass powder.
As another method, there is a method of eluting and removing the soluble material at room temperature after heat treatment by mixing the soluble material in the glass powder or glass fiber, but this method requires a long time to elute the soluble material, a separate binder for molding There is a disadvantage that must be added.
As such, the conventional methods of manufacturing porous ceramics have their own problems.
The present invention has been proposed in view of the problems of the conventional porous ceramic manufacturing method as described above, and an object of the present invention is to produce a porous ceramic having a high porosity even without heat treatment at a high temperature during the production of the porous ceramic, a new porous ceramic It is to provide a method of manufacturing.
According to the present invention, bentonite is contained in 100 parts by weight of a mixture of 20 to 80% by weight of a diatomaceous earth or zeolite having a particle size of 150 μm or less, or a mixture of 20 to 80% by weight of glass powder having a particle size of 100 μm or less. Or 5 to 50 parts by weight of clay is added, and a method for producing a porous ceramic is characterized in that the heat treatment at about 750 ~ 850 ℃.
Hereinafter, the present invention will be described in detail.
The diatomaceous earth or zeolite has fine pores in the powder particles, and the micropores in the particles remain as pores even after the heat treatment to increase the porosity of the ceramic. In general, diatomaceous earth or zeolite itself requires a high temperature of 1000 ~ 1300 ℃ when sintering, but in the present invention by mixing the glass powder with the diatomaceous earth or zeolite, porous ceramics having high porosity even at a relatively low temperature of about 750 ~ 850 ℃ It can manufacture. This is because the diatomaceous earth and the zeolite itself are not sintered at the temperature of 750 to 850 ° C., but the glass having a low softening point is softened at this temperature, so that the softened glass connects the powder particles of the diatomaceous earth or zeolite three-dimensionally. It is possible.
Therefore, when using the diatomaceous earth or zeolite at 20% by weight or less or using the glass powder at 80% by weight or more, it is difficult to obtain a porous material having a high porosity even at a low temperature.
In addition, when the diatomaceous earth or zeolite is used in an amount of 80% by weight or more or the glass powder is used in an amount of 20% by weight or less, the softened glass may not sufficiently connect the powder particles of the diatomaceous earth or the zeolite in three dimensions as described above. Therefore, there is a problem in that the heat treatment temperature must be raised to a high temperature of about 1000 to 1300 ° C., which is a temperature at which diatomaceous earth or zeolite are sintered.
The zeolite has a cation exchange capacity and imparts a cation exchange capacity to the porous ceramic so that when the porous ceramic is used for artificial soils, various filters, nutrient cultivation media, adsorbents, and odorants, the zeolite exhibits an effective function according to each purpose. Do it. In this case, the diatomaceous earth and zeolite may be mixed and used, but only one may be used if necessary. When using a mixture of diatomaceous earth and zeolite, the mixing ratio of these diatomaceous earth and zeolite can be appropriately selected.
At this time, the diatomaceous earth or zeolite uses a particle size of 150㎛ or less. In general, the larger the particle size, the lower the plasticity. Therefore, the present invention uses a diatomaceous earth or zeolite having a particle size of 150 μm or less so as to obtain the required level of plasticity. In addition, the glass powder is to connect and attach the diatomaceous earth and zeolite, the particle size should be smaller than the diatomaceous earth or zeolite. Therefore, the particle size of the glass powder is less than 100㎛ smaller than diatomaceous earth or zeolite.
On the other hand, in order to improve the plasticity of the porous ceramic, plastic additives such as bentonite and clay are mixed with the mixture of diatomaceous earth, zeolite and glass powder. In particular, the bentonite not only improves plasticity of the sintered body, but also improves porosity of the sintered body, unlike ordinary clay, and also has an ion exchange function, and its use is preferable. At this time, glass is mixed with diatomaceous earth, zeolite or a mixture thereof, and 5 to 50 parts by weight of a plastic additive such as bentonite and clay is mixed with 100 parts by weight of the mixture, followed by heat treatment at about 750 to 850 ° C. When the bentonite or the clay is mixed in an amount of 50 parts by weight or more, the mixing amount of the diatomaceous earth or the zeolite is relatively reduced, so that the porosity of the porous ceramic is lowered. At this time, the minimum mixing amount of bentonite or clay is not particularly limited, but in order to obtain the required level of plasticity, it is preferable to mix 5 parts by weight or more.
In this way, when plastic materials such as bentonite and clay are added to the sintered material, plasticity is imparted to the porous ceramic, and thus moldability can be improved without deteriorating physical properties such as porosity, water absorption, and mechanical strength of the porous ceramic. Therefore, the porous ceramics can be molded into various shapes, thereby diversifying the product.
Example 1
50 wt% of diatomaceous earth having a particle size of 150 μm or less, 30 wt% of glass powder having a particle size of 100 μm or less, and 20 wt% of bentonite were mixed and heat-treated at about 800 ° C. The porosity was 47%, the apparent density was 1.21 g / cc, the water absorption was 0.41 g / cc, and the cation exchange capacity was 26 meq / 100 g.
Example 2
10 wt% of zeolite, 30 wt% of glass powder having a particle size of 100 μm or less, and 20 wt% of bentonite were mixed and heat-treated at about 800 ° C. in 40 wt% of diatomaceous earth having a particle size of 150 μm or less. As a result of examining the chemical and physical properties of the resulting porous ceramics, the porosity was 45%, side density 1.29 g / cc, water absorption 0.41 g / cc, and cation exchange capacity of 38 meq / 100 g.
Thus, the porous ceramics obtained as a result of Examples 1 and 2 have a porosity of 35 to 42%, an apparent density of 1.5 to 1.8 g / cc, an absorption rate of 0.32 g / cc, and a cation exchange capacity of 7 meq / 100 g of the conventional ceramics made of only diatomaceous earth. Compared with the excellent chemical and physical properties.
As described above, according to the present invention, a method of manufacturing a porous ceramic capable of producing a porous sintered ceramic having excellent porosity by heat treatment at a relatively low temperature is provided. In addition, according to the present invention, since a material having a cation exchange ability such as bentonite or zeolite is used as a sintering material for producing the porous ceramic, the cation exchange function is imparted to the porous ceramic. Therefore, according to the present invention, porous ceramics having excellent performances such as porosity, water absorption rate, and cation exchange function can be produced at low cost.

权利要求:
Claims (1)
[1" claim-type="Currently amended] According to the present invention, bentonite is contained in 100 parts by weight of a mixture of 20 to 80% by weight of a diatomaceous earth or zeolite having a particle size of 150 μm or less, or a mixture of 20 to 80% by weight of glass powder having a particle size of 100 μm or less. Or 5 to 50 parts by weight of clay and heat treatment at about 750 to 850 ° C.

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同族专利:

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引用文献:

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公开号 | 申请日 | 公开日 | 申请人 | 专利标题

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法律状态:
2000-06-29|Application filed by 최춘식

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2000-06-29|Priority to KR1020000036330A

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2000-10-25|Publication of KR20000063100A

优先权:

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申请号 | 申请日 | 专利标题

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KR1020000036330A|KR20000063100A|2000-06-29|2000-06-29|method of porpsity ceramic|