JPH08337463A - Production of disintegrable ceramic molded body - Google Patents

Abstract

PURPOSE: To improve lubricity, mold releasability at the time of molding and disintegrability by kneading clay with thermoplastic synthetic resin powder, starch and water, molding, drying and firing the resultant mixture. CONSTITUTION: A starting material mixture for ceramics is prepd. by kneading 30-75 pts.wt. clay with 15-50 pts.wt. thermoplastic synthetic resin powder of 30-80 mesh particle size, 5-20 pts.wt. starch, 0.2-0.5 pt.wt. peptizer and water. This mixture is molded, dried and fired at 110-180 deg.C.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a ceramic molding. In particular, it relates to a method for producing a ceramic molded article that is highly disintegratable.

[0002]

The inventor is not aware of this type of prior art.
The prior art of this type known to the inventor is at most the invention described in Japanese Patent Publication No. 40-20181. In this conventional example, a raw material mixture for ceramics obtained by mixing clay, polyethylene resin powder, and water is dried after molding, heated to 130 to 250 ° C., and baked to make the manufacturing method simple and easy. In addition to the fact that a ceramic product can be obtained, it is disclosed that, because of the manufacturing method by low-temperature heating, a ceramic product free from shape loss and color unevenness can be obtained.

[0003]

Problems to be Solved by the Invention The problems to be solved by the present invention are that molded products are not disintegrating, so that it is not easy to dispose of used products and there is a problem in environmental protection. In addition, the conventional mixture of molding raw materials lacks lubricity,
Due to its high viscosity, there were problems such as poor releasability during molding. Therefore, the present invention is intended to solve the above-mentioned problems of the conventional example, and the object thereof is to
The aim is to obtain ceramic products that are highly disintegratable and to improve the releasability during molding.

[0004]

The first method for producing a collapsible ceramic molding of the present invention is to prepare a ceramic raw material mixture by kneading clay, thermoplastic synthetic resin powder, starch and water, and then molding the mixture. Then, the method is a method for producing a disintegrating ceramics molded article, which comprises drying, drying and firing.

The second method for producing a collapsible ceramic molded article according to the present invention is the same as the first production method, wherein the thermoplastic synthetic resin powder is a polyethylene resin. Is the way.

The third method for producing a disintegrating ceramic molding of the present invention is to use 30 to 75 parts of clay, 15 to 50 parts of thermoplastic synthetic resin powder, 5 to 20 parts of starch and 0.2 to deflocculant.
A method for producing a collapsible ceramic molded product, which comprises molding, drying, and firing after a ceramic raw material mixture is obtained by adding 0.5 part of an appropriate amount of water and kneading.

The fourth method for producing a disintegrating ceramics molded article of the present invention is to knead clay, thermoplastic synthetic resin powder, starch, titanium oxide and water to obtain a ceramics raw material mixture,
It is a method for producing a collapsible ceramic molding, which comprises molding, drying, and firing. The fifth method for producing a collapsible ceramic molding of the present invention is the first, second, and third methods.
In the fourth or fourth invention, the firing temperature is 110
It is a method for producing a disintegrating ceramic molded article, characterized in that the temperature is about 180 ° C.

[0008]

The details of the present invention will be described below. In carrying out the present invention, a commonly used ordinary clay is prepared. There are no restrictions on the type of clay. Then, a powder of a thermoplastic resin such as polyethylene resin, polypropylene resin, polystyrene resin, or polyvinyl chloride resin is prepared. Granules are also included in the concept of these powders.

Since these thermoplastic resins are compounds of hydrogen and carbon, they do not affect the preservation of the natural environment regardless of whether they are decomposed or not. The size of the powder makes it easy for the mixture to be used as a raw material for molding, and it is easy for chemical changes to occur due to the physical effects of these resin powders such as sunlight, wind, rain, and temperature differences after use. Moreover, in order to make it easy to be decomposed by microorganisms, the one having about 30 to 80 mesh was adopted.

Further, since the above-mentioned thermoplastic resin generally has a relatively low melting point of 110 to 180 ° C., the heating temperature at the time of firing is significantly lower than the firing temperature of general ceramic products. Since it is sufficient, there is an advantage that the product can be obtained by a simple heating facility. For example, when obtaining a pottery for handicraft, it is considered that the pottery can be heated and fired by a simple oven. Therefore, although the details will be described later, it is easy to understand that the present invention is suitable as a craft hobby and a teaching material because a ceramic can be easily obtained.

A method for obtaining a ceramic product from the above-mentioned two materials is disclosed in a conventional example, and in addition to the advantages described above, there is an advantage that a lightweight ceramic can be easily obtained. There has been no solution for improving disintegration after use and releasability during molding.

Therefore, in the present invention, in order to solve this problem, an attempt was made to mix and stir the starch in addition to the above-mentioned raw materials. Experimentally adopted by the inventor are processed starches as well as natural starches such as starch and starch.

By kneading starch in addition to the above-mentioned two materials, some problems which the present invention has made it possible to solve. When discarded after use after obtaining the ceramic molding by the basic method described above,
Although the thermoplastic resin powder is contained in the ceramic products by being eaten by microorganisms, its form is destroyed and the viscosity of the starch does not increase even if water is added to the raw material. Since it does not swell with water, it does not adversely affect the properties of clay. In addition, it was revealed by the inventors' experiments that the lubricity can be improved by adding starch. Therefore, it was possible to improve the releasability of the product during molding.

Next, specific examples that the inventor has tried will be given. Test Example No. 1 No. 2 No. 3 No. 4 Clay 75 parts 70 parts 65 parts 55 parts Polyethylene resin powder 25 parts 25 parts 25 parts 25 parts (80 mesh) No starch 5 parts 10 parts 20 parts Add about 30 parts of water to these, preferably sodium silicate,
By adding 0.2 to 0.5 parts of a deflocculant such as tripolyline soda and soda citrate to knead them to form a slurry, and dehydrating the mixture, a mixture of raw materials for ceramic molding is obtained. The mixture was poured into a plaster mold to obtain a green body. And
After drying the green body, it was baked at 130 ° C. for about 1 hour to obtain a ceramic product.

When this ceramic product was buried in soil and dug up to check the change over time after 4 months, No. 1 does not change at all. No. 2 was broken by pressing it hard with a fingertip. No. 3 and No. 4 was completely collapsed.

Further referring to this point, when the ceramic molding is discarded and buried in the soil, the starch is first eaten by microorganisms. Thus, the ceramic raw material admixture of a certain form that composes the ceramic molded article, in which the ceramic molded article has fine pores and is bonded through starch, undergoes a morphological change and collapses as the test results described above. did.

At this time, it has been generally considered that the thermoplastic resin powder does not change as compared with the state at the time of molding, but according to the inventor's confirmation, at least due to a change in morphology, Since it is attributed to, it was confirmed that adverse effects on animals and insects in the natural world can be avoided.

Further, these thermoplastic resin powders are decomposed, though very gradually, under the influence of sunlight, wind and rain, temperature difference between cold and warm, and a myriad of inorganic and organic substances existing in nature. Can be predicted.

In addition to the above-mentioned examples, the inventor also tried to promote the morphological collapse action by a photocatalyst when a molded product obtained by further mixing titanium oxide is discarded. Titanium oxide converts light into energy
As a result, it has been proved that it has a function of a catalyst for converting oxygen and water contained in the air into active oxygen. It is also known that active oxygen has a property of decomposing organic substances and inorganic substances. Then, the inventor added about 0.5 to 5 parts of fine particles of titanium oxide in addition to starch and kneaded them in the above-mentioned embodiment.

As a result, although there was no particular change in the disintegration property when buried in the soil, when it was left on the surface of the ground and discarded, titanium oxide was contained in the mixture constituting the molded article as described above. The active oxygen decomposes not only starch but also thermoplastic resin powder because it has a catalytic action of converting oxygen and moisture in the air into active oxygen by using light such as sunlight rays incident on titanium oxide as an energy source. Therefore, when titanium oxide is mixed, light energy is required for the disintegration action, but there is an advantage that the disintegration of the molded product can be performed in a remarkably short time. According to an experiment conducted by the inventor, when titanium oxide is mixed, light is used as an energy source, but when sunlight is used as an energy source on the ground surface, it collapses by pushing hard after two months with a hand. It was After 3 months, it was confirmed that it had completely collapsed without being pushed by hand.

This has different advantages from the above-mentioned embodiment depending on the use of the molded product. For example, when a molded article is obtained as a temporary container for seedlings for use during the growth of seedlings, and then the temporary container for seedlings according to the present invention is used together with the seedlings in the nursery,
After the seedling growth time, the need for a temporary container disappears, so by matching this growth time with the planned collapse time of the molded product (temporary container), the temporary oxidation of the titanium oxide due to the photocatalytic action of titanium oxide is performed. There is an advantage that the container collapses and returns to the soil as it is. It can be easily understood that the growth time can be adjusted by adjusting the amounts of starch and titanium oxide in order to match the planned collapse time of the temporary container.

The present invention can be applied not only to the above-mentioned production of handicraft porcelain, but also to all kinds of traditional ceramic products.

In addition, the present invention is particularly advantageous when applied to disposable products. As a result, so-called outdoor products (plates,
In principle, there are no restrictions on the type and form of cups, forks, knives, etc.), golf pins, flowerpots for teaching materials, etc., so it can be used not only for daily necessities but also for industrial use such as temporary frames for construction .

[0024]

Since the present invention has the above configuration, it has the following advantages. (1) Since the starch is mixed in the ceramic products, even if it is discarded in the natural world, the starch will be decomposed by microorganisms,
Clay and thermoplastic resin powder that compose ceramic products collapse from a solid state to a sandy state. Therefore, the ceramic product in the form of a solid changes into a sandy form, so that it is possible to obtain a ceramic product that can contribute to environmental conservation without destroying the natural environment even if it is discarded. (2) Since starch is mixed in the ceramic raw material mixture,
Excellent releasability during molding. (3) When titanium oxide is mixed, the light energy
Since it has a catalytic function to convert oxygen and water in the atmosphere into active oxygen as a source, it is possible to promote disintegration in a shorter time by the action of light such as sunlight when the molded product is disposed of. .

Claims (5)

[Claims] 1. A method for producing a collapsible ceramic molding, which comprises kneading clay, thermoplastic synthetic resin powder, starch and water to obtain a ceramic raw material mixture, followed by molding, drying and firing. 2. The method for producing a collapsible ceramic molded article according to claim 1, wherein the thermoplastic synthetic resin powder is a polyethylene resin. 3. Clay 30 to 75 parts, thermoplastic synthetic resin powder 15 to 50 parts, starch 5 to 20 parts and peptizer 0.2 to
A method for producing a collapsible ceramic molding, which comprises molding, drying and firing after obtaining a ceramic raw material mixture by adding an appropriate amount of water to 0.5 part and kneading. 4. A collapsible ceramic molded product characterized by being obtained by kneading clay, thermoplastic synthetic resin powder, starch, titanium oxide and water to obtain a ceramic raw material mixture, followed by molding, drying and firing. Production method. 5. The method for producing a collapsible ceramic molded article according to claim 1, wherein the firing temperature is about 110 to 180 ° C.