JPH03164482A - Production of ceramic porous body - Google Patents

Abstract

PURPOSE:To render nonreactivity with ink and to prevent the degeneration of ink by mixing ceramic powder with specified powder, granulating and molding the mixture gnd sintering the molded body by heating. CONSTITUTION:A mixture of 70-30wt.% ceramic powder of 0.1-10mum particle size, e.g. alumina powder with 30-70wt.% powder of 10-100mum particle size having a lower decomposition temp. than the ceramic powder and the powder shape at ordinary temp., e.g. PE powder is granulated, filled into a metal mold and press-molded under 1,000-2,000kg/cm<2> pressure and the molded body is sintered by heating.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a porous ceramic body, which can be used for porous printed bodies, porous printing wheels, porous rollers, stamp pads, and the like.

[Conventional technology]

Conventionally, porous printing bodies, porous printing wheels, porous rollers,
For porous ink-impregnated bodies such as stamp pads, (a)
Synthetic resins (b), synthetic rubber (c) fibers, felt (d) metals, etc. have been used in the various porous bodies mentioned above, but they have the following drawbacks. (a) For synthetic resin products,
That it may be soaked by the ink being impregnated. (
b) In the case of synthetic rubber, is it elasticity, which is a characteristic of "rubber"?

It may be lost due to ink.

(c) In the case of fibers and felt, it is impossible to form a stamp surface with characters, etc., making it impossible to print clearly. (d) In the case of metal, deterioration of the ink due to oxidation of the metal cannot be prevented. As mentioned above, all of them have advantages and disadvantages, and the necessary conditions for porous materials include not being immersed in ink, not changing the quality of the ink, and ensuring that the porous material is stable and does not change at room temperature. The present application solves all of these drawbacks and provides an inexpensive porous body.

[Means to solve the problem]

In order to solve the above-mentioned problem, a porous body is made using ceramic powder, and the particle size is 0.1 μ to 10 μm.
) T ceramic powder material (A) and a powder material (A) with a particle size of 10 μ to 100 μ that decomposes up to the sintering temperature of the powder material (A)
A method for producing a ceramic porous body, which comprises mixing and granulating B), molding the mixed granulated powder in a mold, and then heating and sintering it.

This will be explained below using examples.

Figure 1 is a manufacturing process diagram, and shows the ceramic powder material (Δ
) has an R diameter in the range of 0.1 μm to 10 μm, and the components include alumina, zirconia, silicon oxide, titanium oxide, silicon carbide, silicon nitride, etc.

Next, a substance that has a lower decomposition temperature than the ceramic powder material (A) described above and is a powder at room temperature, and has a particle size of 10
μ to 100μ, such as potato starch,
There are polyethylene, vinyl chloride, acrylic, etc.

Now, the ceramic powder material (A) and the decomposing powder material (B)
) in a mixer at a ratio of 70:30 to 30:70. The porosity of the porous material can be determined by this mixing ratio; if the mixing ratio is less than 70:30, continuous pores will not be formed, and if it is more than 3070, the hardness, brittleness, distortion, etc. of the porous material will increase. It cannot withstand use.

After filling this mixed powder into a mold at a certain temperature at room temperature,
Molding is performed at a pressure of ~2,000 kg/aJ1.

Depending on the composition of the ceramic powder material (A) or the mixing ratio of the ceramic powder material <A> and the decomposing powder material (B), deformation may occur during molding. , wax, thermoplastic resin, thermosetting resin, cellulose, etc. are used as binders for primary molding.

Next, the temperature is raised and sintered in a sintering furnace.

Example 1 Ceramic powder material (A>Alumina particle size 0.1μ to 10
After thoroughly mixing μ with 100 parts of barley silla starch and 100 parts of barley silla starch with a mixer and granulating it with 2 parts of binder in a granulator, it was put into a mold with concave letters. 2,000 k by hydraulic press after removing 1 stack and filling
The pressure is maintained at room temperature for 1 minute at a pressure of g/cd to obtain a printed body after primary molding as shown in FIG. This molded printed body is degreased by increasing the temperature from room temperature to 600°C by 10°C/hour, and then sintering from 600 to 1,400°C by 2°C/hour.
The temperature was raised for 1 minute, and then cooled to obtain a porous printed body. This porous printed body (the porosity of 2 is approximately 50%, the pore diameter is 10 μ to 10
It was 0μ.

Example 2 Ceramic powder material (A) Zirconia particle size 0.1μ~・
10μ of polyethylene with a particle size of 10μ to 100μ as a powder material (B) to be burned out, 80 parts by weight,
Using 10 parts by weight of wax as a binder, granulate it with a granulator, place it in a cylindrical mold shown in Fig. 71 in total of 100 parts by weight, and after filling, use a hydraulic press to press 2, 0
00 k+r/cd, time 1 minute to obtain the primary molded product shown in Figure 71. Next, degreasing was performed in a sintering furnace at room temperature to 600".
The temperature is increased to 10℃/hour to 600 to 1.500℃, and the sintering is
"C1 temperature was raised at 10° C./min and cooled to obtain a porous roller. The porous roller had a porosity of about 50% and a pore diameter of 10 μm to 80 μm.

Example 3 Ceramic powder material with alumina particle size of 0.1 μm to 10 μm (
A) 100 parts by weight, 120 parts by weight of vinyl chloride with a particle size of 10μ to 100μ as the powder material (B) to be burnt out, and 1 part by weight of acrylic as a binder, and granulated with a granulator. , After making the concave mold for the convex plate uniform in thickness at 1 m/m (not shown in Fig. 3 (b)), only the ceramic powder material (A) was layered, and the pressure was set at 2,000 with a hydraulic press.
Mold at ktx/cd for 1 minute.

As shown in Figure 3 (b), this second molded product is made of a powder material (8.0
1 is mixed. This is degreased in a sintering furnace at room temperature to 600℃, heated at 10℃/hour, and sintered to 600 to 1
, 400° C., and heating at 10° C./min, and when cooled, a printed material was obtained in which only the surface layer was porous. The printed body was attached to a holder (3) and used as a printing shaft as shown in FIG. 3(A).

Example 4 The ceramic powder material (A> shown in Example 1) and the decomposable powder material (B) were mixed and granulated together with a binder, and a mold was filled with the powder and the mixture was heated to a pressure of 2,000 kIr using a hydraulic press.
/ aJ, time 1 minute, thickness 10m/m as a molded product
A plate-like piece with a size of 50 m/m x 120 m/m was obtained. This is degreased and heated at 10°C/hour from room temperature to 600'C, and sintered at 600-1,400°C.
The stamp pad was sintered at a temperature increase of 10° C./min until the stamp was cooled, and then impregnated with water-based ink to form the stamp pad shown in FIG.

〔effect〕

As mentioned above, the porous body obtained by mixing and granulating the ceramic powder material (A) and the powder material (B) that decomposes and burns out is molded and sintered. When used, ■Porosity, hardness, etc. can be changed arbitrarily by changing the mixing specific gravity and the components of the powder material (A), so it can be manufactured to suit the purpose of use. ■Poor reactivity with ink. Therefore, there is almost no deterioration of the ink or aging of the porous material.

[Brief explanation of the drawing]

Fig. 1 Manufacturing process Fig. 2 Perspective view of Example 1 Fig. 3 (A) Perspective view of Example 3 U (B) Printed image of n Fig. 4
Perspective view of Embodiment 2 Figure 5 Perspective view of Embodiment 4 ■ = Imprint 2: Print body 3: Holder

Claims (1)

[Claims] Ceramic powder material (A) with a particle size of 0.1 μ to 10 μ and a particle size of 10 μ to 1 that decomposes up to the sintering temperature of the powder material (A)
A method for producing a ceramic porous body, which comprises mixing and granulating a powder material (B) of 00 μm, molding the mixed granulated powder in a mold, and then heating and sintering it.