JPS589065B2 - Mukishitsuseiyousoseibutsu - Google Patents

Description

[Detailed description of the invention] The present invention relates to inorganic molding compositions.

Therefore, the present invention was made in order to provide a molding composition that does not require high-temperature firing as in the case of conventional porcelain production and has excellent moldability.

That is, in conventional porcelain manufacturing, firing was required at a high temperature of about 1300° C. for about 40 hours, which required a large amount of heat and was uneconomical.

Furthermore, temperature control during firing is difficult, the process is complicated,
There were drawbacks such as the wide range of applications and the need for an ultra-high pressure press in the molding process.

In order to alleviate the above disadvantages to some extent, for example, an aqueous solution of monophosphate polymer is used as a binder, and synthetic minerals such as zirconium oxide, zirconium silicate, etc., chromic acid aqueous solution, etc. are used for reinforcement. A method has been proposed in which a paste-like composition is obtained by blending materials, water, etc., which is then molded and cured by heating. It was impossible to mold the product.

The present invention has been made based on the above circumstances, and uses a phosphoric acid binder as a binder, and mixes synthetic minerals, water, and a viscous substance with plasticity with this to make these the main components. This provides an inorganic molding composition containing a filler or other additives.

The phosphoric acid binder used in the present invention includes phosphoric acid or a monobasic metal phosphate, such as monobasic zinc phosphate, monobasic aluminum phosphate, monobasic magnesium phosphate, monobasic
Calcium phosphate, dibasic iron phosphate, dibasic manganese phosphate, etc., or polymers thereof are used.

Each of these may be used alone or in combination of two or more.

The binder is most preferably one mainly composed of monoaluminum phosphate.

As the synthetic mineral, metal oxides such as zirconium oxide, aluminum oxide, and magnesium oxide, or metal silicates such as zirconium silicate are used.

Each of these may be used alone, but two or more may be used in combination.

Examples of the clay material having plasticity include frog's eye clay, kaolin, bentonite, and the like.

However, most preferred is frog's eye clay, followed by kaolin.

Fillers that can be used as needed include silica, mineral fiber, glass fiber, silica sand, clay, alumina, serpentine,
Examples include peridotite.

In addition, it is preferable to use each of the above-mentioned raw materials in the form of fine powder as much as possible.

Each of the above raw materials is mixed with an appropriate amount of water using a mixer such as a blender or a kneader to form a composition having excipient properties.

In this case, the blending ratio of each raw material is not particularly limited, but the binder is 5 to 15 parts by weight (hereinafter referred to as parts).
, 15 to 45 parts of synthetic minerals, 15 parts of clay material with plasticity
-30 parts and 5 to 30 parts of water are preferred.

In addition to these, fillers may be mixed within a range that does not impair practicality such as moldability and properties of the molded product.

Note that the binder is often used in the form of an aqueous solution, and in that case, the amount of water to be separately mixed may be reduced by the amount equivalent to the water contained in the binder.

The inorganic molding composition obtained as described above is a wet composition.

This material can be put into a mold such as a metal mold and compression molded.

In addition, since it contains a clay material having plasticity, it has good filling properties into the mold cavity during molding, and even molded products with somewhat complicated shapes can be molded without causing scratches or the like.

Therefore, molding can be easily performed without the need for an ultra-high pressure press that has been conventionally used.

As mentioned above, the composition or molded product obtained by the present invention is as follows:
It can be widely used as an electrical insulating material for which porcelain materials have traditionally been used, as well as other industrial materials that require heat resistance and nonflammability.

Examples will be described below.

Example 1 50% concentration phosphoric acid 20 parts Aluminum oxide 30 Frog's eye clay 25 Silica 20 Water 5 The above ingredients were mixed in a seconder to obtain a uniform, moist, flaky composition.

This composition was put into a mold and molded using a compression molding machine.

The shape of this molded product is a cylindrical container with an outer diameter of 40mm, a total height of 42mm, a bottom thickness of 15mm, and a peripheral wall thickness of 5mm.
And height 2. 5mm, width 2m
It had a ridge of m.

Note that the molding pressure was 150 kg/cII.

During molding, the mold cavity is completely filled with the composition;
A perfectly shaped molding was obtained.

When this molded product was cured by firing at 400° C. for 2 hours, it became a cured product resembling porcelain.

Example 2 Zinc monophosphate (50% aqueous solution) 22.5 parts Magnesium oxide 275 Kaolin
30〃Silica
15〃Water
A molding composition was obtained by mixing the above raw materials.

Next, the same molded product as in Example 1 was molded.

During molding, the mold cavity is completely filled with the composition,
A perfectly shaped molding was obtained.

When this molded product was cured by firing at 300C for 30 minutes, a cured product resembling porcelain was obtained.

Example 3 Monobasic aluminum phosphate 20 parts (50% aqueous solution) Zirconium oxide 30% 15% chromic acid aqueous solution 3 Bentonite 15 Silica sand 10 Water 5 A molding composition was prepared in the same manner as in Example 1 using the above formulations. Obtained.

Furthermore, when the same molded product as in Example 1 was molded, a molded product with excellent filling properties was obtained.

By firing this molded product at 300° C. for 3 hours, a cured product resembling porcelain was obtained.

Comparative Example Aluminum phosphate (50% aqueous solution) 20 parts 15
Chromic acid aqueous solution 3 Zirconium oxide 30 Silica powder
25〃Water
5. A molding composition was obtained in the same manner as in Example 1 by blending the above ingredients.

Further, the same molded product as in Example 1 was molded, but the composition was not filled in the peripheral wall soil end portion and the ridges of the molded product, and a complete molded product could not be obtained.

Claims (1)

[Claims] 1 Phosphoric acid or (and) primary metal phosphate or (
and) an inorganic molding composition containing a phosphoric acid binder such as Bolima, a synthetic mineral, a viscous substance having plasticity, and water as main components.