JPS6197157A - Method of forming ceramics - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] It relates to a composition for cis molding, and more specifically, it is characterized in that a resin emulsion is added to a ceramic base soil or a ceramic base soil to prepare a slurry, and this is cast-molded. Regarding the method for molding ceramics and the composition for molding ceramics characterized by adding a resin emulsion to the base soil for ceramics or the base soil for ceramics, an appropriate amount of water, a dispersant, etc. is added to the base soil. The slurry is poured into a water-absorbing mold such as a plaster mold, and the slurry is deposited along the surface of the mold due to the water absorption of the mold. The body is formed into rice.This molded body is then dried, bisque fired,
Ceramic products are made through processes such as glazing and firing, but when using this method, the cast molded product must have sufficient mechanical strength to be able to be handled during finishing processing and transportation. Efforts have been made to provide the necessary mechanical strength for the work by glazing, but it is still difficult to impart sufficient mechanical strength to cast bodies formed on such substrates by bisque firing. In addition, the use of clay made it difficult to produce high-quality porcelain with the transparency of white porcelain, and due to the depletion of high-quality clay resources,
We are facing an even more difficult situation. Under these circumstances, there has been a strong desire to develop a strength improver that can impart sufficient mechanical strength to a cast molded product without using a large amount of clay.

If the casting method can be applied to the base soil for ceramics, it will be possible to easily mold products with complex shapes, but with the base soil alone, it is difficult to form cast bodies with sufficient strength. Therefore, there has been a strong desire to develop a strength improver that provides cast molded products with sufficient mechanical strength for handling such as finishing and transportation.

As a result of repeated research to solve the above-mentioned problems, the present inventors discovered that the mechanical strength of a cast molded product can be increased by using a resin emulsion as a strength improver. When performing peat casting molding of ceramic base soil or ceramic base soil, a resin emulsion is added to the base soil to improve the strength of the cast body, simplify the process, and efficiently produce ceramic products of excellent quality. The present invention relates to a method for molding ceramics and a composition for molding ceramics in which a resin emulsion is added to a base clay for ceramics or a base soil for ceramics.

In the present invention, the base soil for ceramics refers to materials that have been used up to now as base soils for ceramics, such as feldspar, silica, pottery stone, kaolin, and clay. .

It refers to ceramic raw materials such as zirconia, silica, ferrite, silicon carbide, silicon nitride, and -9-Iaron.

Resin emulsions include, for example, (meth)acrylic ester resin, (meth)acrylic ester-vinyl acetate resin, (meth)acrylic ester-styrene resin, (meth)acrylic ester-vinyl chloride resin, etc. as main components. acrylic resin emulsion, vinyl acetate resin emulsion containing vinyl acetate resin as the main component, ethylene copolymer resin emulsion containing ethylene-acrylic acid ester, ditrene-vinyl chloride resin, styrene-butadiene resin, Synthetic rubber emulsion and natural rubber emulsion whose main components are methylene-butadiene methacrylate/resin, acrylonitrile-butadiene resin, etc.

Among these, acrylic resin emulsions are preferred.

The amount of resin emulsion added to ceramic base soil or ceramic base soil varies depending on the type of base soil, the type of resin emulsion, the type of ceramic molded product to be manufactured, etc., and cannot be determined uniformly. Usually, an appropriate solid content is about 0.1 to 20 parts by weight based on ±100 parts by weight of the dry base material.

The slurry of the present invention, which is prepared by adding a resin emulsion to ceramic base soil or ceramic base soil, is extremely stable, has low viscosity, has good fluidity, and has excellent moldability. has excellent mechanical strength. The scope of the slurry of the present invention includes not only those consisting of base soil and resin emulsion, but also slurries containing dispersants, other ceramic raw materials, etc. in addition to the same components.

The cast molded body formed by the method of the present invention has enough strength to withstand handling or post-processing as it is, even without a subsequent bisque firing process. Therefore, the bisque firing process may be omitted and glazing and firing may be performed to produce a ceramic molded body, or, if necessary, the cast molded body may be colored and decorated and then glazed and fired. Furthermore, the composition of the present invention can be used not only by the casting method but also by
Even when used in extrusion molding methods, potter's wheel molding methods, etc., it has excellent cutting properties, easy post-processing, and expands the range of surfaces that can be used, as well as expanding the objects of molding9. Excellent effects such as a ceramic molded body with high strength can be obtained.

EXAMPLES The present invention will be specifically explained below with reference to examples, but it goes without saying that these examples are only a small part of the present invention. However, % indicates weight %.

Example 1 Water Glass No. 1 was added at 0.41% based on the dry solid content of the base soil to a low clay base soil (Marui Ceramic Co., Ltd. product, special grade soil) as a ceramic base soil, water was further added, and the mixture was mixed and stirred. Solid content 6
A slurry of 8.4% was obtained. To this slurry, a resin emulsion A (acrylic resin emulsion containing styrene-2-ethylhexyl acrylate as the main component, solid content 4) was added.
3%), B (carboxyl-modified acrylic resin emulsion whose main component is styrene-2-ethylhexyl acrylate.

solids content 43%), C (styrene-methyl methacrylate-
Add and mix D (vinyl acetate resin emulsion containing vinyl acetate as a main component, solid content 43%) as shown in Table 1. Stirring was performed to obtain a homogeneous slurry.

This slurry has a length of 20M11, a width of 90cm, and a thickness of 511L.
The mixture was poured into a plaster mold of 100 mL and left to ink, and then removed from the mold, and then dried at room temperature and 110° C. to obtain a cast molded product having a strength of S:51. This cast molded body was fired to obtain an excellent ceramic molded body. The bending strength was measured using Tensilon UTM-In-500 manufactured by Toyo Bold Twin Co., Ltd.

Table 1 In this case, the strength when bisque firing was performed at 800℃ after casting without adding resin emulsion was 36.
(KPf/m).

Example 2 Water Glass No. 1 was added at 0.26% based on the dry solid content of the base soil to a common base soil (Marui Ceramic Co., Ltd. product, No. 30 soil) as a ceramic base soil, water was further added, and the mixture was stirred. A slurry with a solid content of 69.1% was obtained. To this slurry, the resin emulsion/A used in Example 1 was added as shown in Table 2 (2), and a cast molded body was obtained in the same manner as in Example 1, dried, and the strength shown in Table 2 was obtained. A molded body having the following properties was obtained.This molded body was fired to yield an excellent ceramic molded body.

Table 2 Note that the strength was 41 when unglazed firing was performed at 800°C after casting without adding resin emulsion.
(KPf/d).

Example 6 Alumina powder (A-16SG) manufactured by ALCOA 5K
P and Nippon Light Metal ■Cracked alumina powder (A-32) 5Kp
Measure.

A realumina powder mixture of 10 and 9 was obtained. Add to this a dispersant [Chukyo Yushi■, product name Cell, Nur D-305) 60I
and water were added and mixed to obtain a slurry with a solid content of 81.4%.

Resin emulsion A used in Example 1 was added to this slurry.
, B, C, D and E (acrylic resin emulsion whose main component is n-butyl methacrylate.

Solid content: 43%) was added as shown in Table 6, a cast molded body was obtained in the same manner as in Example 1, and dried to obtain a cast molded body having the strength shown in Table 3. This molded body was fired to yield an excellent ceramic molded body.

Table 6 Example 4 Dispersant for silica (silica stone from China) [Chukyo Yushi ■, trade name,
Cerner D-305) to 0.6% of the dry solid content of the base soil.
% was added, water was further added, and mixed to obtain a slurry with a solid content of 68.9%. To this slurry, resin emulsions B, C, and D used in Example 1 were added to the slurry listed in Table 4,
A cast molded body was obtained by the same operation as in Example 1, and dried to form a fourth
A cast molded body having the strength shown in the table was obtained.

Table 4 Example 5 Zirconia (Toyo Soda Co., Ltd. product, TZ-3Y) 10
Ky- to dispersant [Chukyo Yushi■, product name (Cellner D-3)
05)) 200! Add y and water and mix to reduce solid content to 7.
A 1.4% slurry was obtained. To this slurry, resin emulsions A and D used in Example 1 were added as shown in Table 5, a cast molded body was obtained in the same manner as in Example 1, and dried. A cast molded body having strength was obtained. This molded body was fired to yield an excellent ceramic molded body.

Table 5 Example 6 β-type silicon carbide powder (product of IBIDEN Co., Ltd., trade name Beta Random Ultra Fine) 1000. boron [Mitsuwa Chemical ■ product] 3II, dispersant [Sannopco ■ product]
Product name SN Dispersan) 5045) 5g, 70
% monoethylamine aqueous solution (Kishida Chemical Co., Ltd.) 10I and water were added and mixed to obtain a slurry with a solid content of 65%.

Resin emulsion A used in Example 1 was added to this slurry as shown in Table 6, and a cast molded body was obtained in the same manner as in Example 1, and dried to have the strength shown in Table 6. A cast molded body was obtained.

Table 6 Patent applicant: Mitsui Toatsu Chemical Co., Ltd. Procedural amendment (voluntary) November 26, 1982

Claims (2)

[Claims] (1) A method for molding ceramics, which comprises adding a resin emulsion to a base soil for ceramics or a base soil for ceramics to prepare a slurry, and casting the slurry. (2) A composition for molding ceramics, which is characterized in that a resin emulsion is added to the base soil for ceramics or the base soil for ceramics.