JPH0717778A - Porous ceramic granule formed body and production - Google Patents

Abstract

PURPOSE:To provide a porous ceramic granule formed body in which most of the porous faces of the porous ceramic granules are exposed because of partial coating with a binder. CONSTITUTION:A thermoplastic resin formed into a required shape is embedded in porous ceramic granules and they are heated to the temp. at which the resin melts to fuse the porous ceramic granules to the surface of the resin. After cooling, the thermoplastic resin with porous ceramic granules continuously stuck to the surface is taken out of the porous ceramic granules.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molded body of porous ceramic particles used as various carriers for catalyst metals, fungi for decomposing organic substances such as water treatment, and a method for producing the same.

[0002]

2. Description of the Related Art Porous ceramic particles are also used as various carriers. There is a case where a molded body obtained by joining the porous ceramic particles to give a desired shape is required. As a method for producing this molded body, conventionally, a method in which porous glass particles are coated with water glass or an easily sinterable powder and press-molded and fired, or a porous ceramic particles are coated with a thermosetting resin and hot molded There is a way to press. Since all of these methods perform press molding, it is difficult to manufacture a hollow molded body or a thin product, and most of the surfaces of the porous ceramic particles are covered with the material used for bonding, and There is a problem of impairing porosity.

[0003]

SUMMARY OF THE INVENTION In the present invention, the porous surface of the porous ceramic particles is only partially covered with the bonding material, and most of the porous surface is exposed as it is. An object is to obtain a molded body of porous ceramic particles.

[0004]

DISCLOSURE OF THE INVENTION The present invention comprises a thermoplastic resin formed in a required shape and porous ceramic particles continuously covering the surface of the thermoplastic resin and welded to the thermoplastic resin. The porous ceramic particle formed body and the thermoplastic resin formed into a required shape are embedded in the porous ceramic particle and heated to a temperature at which the resin melts to form the porous ceramic particle on the surface of the resin. A method for producing a porous ceramic particle molded body, in which the thermoplastic resin having the surface continuously fused with the porous ceramic particles is taken out from the embedded porous ceramic particles after fusion-bonding and cooling.

The thermoplastic resin used in the present invention may be polyethylene, vinyl chloride, polystyrene, polypropylene or the like as long as it is melted by heating. As the shape, a material having a thickness of about 0.3 to 1 mm and formed into a plate, a cylinder, a bellows shape, or another shape is used. Since this thermoplastic resin is used for the purpose of joining the porous ceramic particles, it is uneconomical if it is too thick.
However, a thickness is necessary to maintain the shape.

The porous ceramic particles are obtained by granulating and firing diatomaceous earth, adding a pore-forming material such as sawdust to clay, granulating and firing, and spray-drying clay slurry and then firing. For example, those manufactured by a known method can be used. The bulk density of the porous ceramic particles is about 0.5 to 1 g / cc, but the size is a spherical shape with a diameter of 0.3 to 1 mm, a cylindrical shape with a diameter of 1 to 2 mm and an aspect ratio of about 1 to 3. What is used.

The embedding of the thermoplastic resin formed in the required shape into the porous ceramic particles is carried out by placing a small amount of the porous ceramic particles in the processing container, placing the thermoplastic resin on the porous ceramic particles, and then arranging the thermoplastic resin around the porous resin particles. It suffices to pour the fine ceramic particles so that the thermoplastic resin is buried therein, to give vibration to the processing container so that the porous ceramic particles are in good contact with the entire surface of the thermoplastic resin. The heating temperature and the holding time differ depending on the type of the resin, but may be any temperature as long as the resin is melted and the porous ceramic particles are surely welded to the resin.

[0008]

Since the strength of the porous ceramic particles is low, if the surface of the porous ceramic particles is adhered to the thermoplastic resin, the porous ceramic particles are easily separated from the surface of the thermoplastic resin. Therefore, by maintaining the heating time to such an extent that the thermoplastic resin is slightly absorbed in the pores of the porous ceramic particles, most of the porous surface of the porous ceramic particles remains exposed even after cooling. Thus, it is possible to form a porous ceramic grain molded body in which the resin and the porous ceramic grain are securely bonded and the surface of the resin is continuously covered.

Since the thermoplastic resin formed into the required shape is embedded in the porous ceramic particles, the shape of the thermoplastic resin is maintained even when melted by the layer of the porous ceramic particles.
A molded product conforming to the shape of the thermoplastic resin is obtained. Therefore, a thin product and a hollow body can be easily manufactured.

[0010]

【Example】

Example 1 In a cylindrical container made of aluminum having a diameter of 66 mm and a height of 80 mm, a wall thickness of 0.3 mm made of hard polyethylene and a diameter of 4
A cylinder with a length of 0 mm and a length of 80 mm is placed upright and the diameter is 1 m.
m, cylindrical length 1-3 mm, bulk density 0.53 g /
The cc diatomaceous earth fired particles were poured into and out of the cylinder so that the entire cylinder made of hard polyethylene was filled with the diatomaceous earth fired particles. Next, vibration was applied to the aluminum cylindrical container so that the fired diatomaceous earth particles were well adhered to the entire inner and outer surfaces of the hard polyethylene container. This is heated in an air bath at 200 ° C. for 90 minutes, then cooled and taken out from the layer of diatomaceous earth calcined particles to obtain a molded product in which the diatomaceous earth calcined particles are continuously welded to the entire inner and outer surfaces of a cylinder of hard polyethylene. It was

Example 2 A cylindrical container made of aluminum having a diameter of 66 mm and a height of 80 mm is made of hard polyethylene and has a wall thickness of 0.3 mm and a diameter of 4 mm.
A cylinder with a length of 0 mm and a length of 80 mm is placed upright and the diameter is 0.3.
Clay hollow porous spheres of ~ 0.8 mm and bulk density of 1.0 g / cc are poured into the inside and outside of a cylinder made of hard polyethylene so that this cylinder is filled, and vibration is given to a cylindrical container made of aluminum to make a hollow clay clay. The spheres were in good contact with the inside and outside of the cylinder made of hard polyethylene. Then this 2
After heating in an air bath at 00 ° C. for 90 minutes, it was cooled and taken out from the layer of clay-like hollow porous spheres to obtain a molded body in which the clay-like hollow porous spheres were continuously welded to the entire inner and outer surfaces of a rigid polyethylene cylinder. It was

Example 3 A cylindrical container made of aluminum having a diameter of 90 mm and a height of 120 mm and having a columnar shape having a diameter of 1 mm and a length of 1 to 3 mm and having a bulk density of 0.53 g / cc and calcined diatomaceous earth particles were slightly added. ,
On top of that, a soft polyethylene wall thickness 0.8 mm, diameter 5
A cylinder with a closed end of 5 mm and a length of 70 mm was inserted with the closed end facing down. Then, the above-mentioned diatomaceous earth fired particles are poured into and out of a soft polyethylene cylinder so that the soft polyethylene cylinder is filled, and vibration is applied to an aluminum cylindrical container so that the diatomaceous earth fired particles are a soft polyethylene cylinder. I made good contact with the inner and outer surfaces. This one
After heating in an air bath at 80 ° C. for 90 minutes, it was cooled and taken out from the layer of diatomaceous earth calcined particles, to obtain a molded body in which the diatomaceous earth calcined particles were continuously welded to the entire inner and outer surfaces of the soft polyethylene cylinder.

[0013]

According to the present invention, the porous surface of the porous ceramic particles is only partially covered with the bonding material,
It is possible to provide a molded body of porous ceramic particles in which most of the porous surface is exposed as it is. Also, thin-walled ones and hollow ones can be easily manufactured.

Claims (2)

[Claims] 1. A thermoplastic resin formed into a required shape,
A porous ceramic grain compact formed by continuously covering the surface of the thermoplastic resin and comprising the thermoplastic resin and the fused porous ceramic grains. 2. A thermoplastic resin formed into a required shape,
It is embedded in a porous ceramic grain, heated to a temperature at which the resin melts, and the porous ceramic grain is fused to the surface of the resin, and then cooled, and the embedded porous ceramic grain forms a porous layer on the surface. A method for producing a porous ceramic particle compact, which takes out the thermoplastic resin in which fine ceramic particles are continuously welded.