JPS5814387B2 - Pottery clay composition - Google Patents

Description

Detailed Description of the Invention The present invention uses pottery clay as a base material, and contains one or two polyolefin resins selected from polyethylene resin, polypropylene resin, and polybutene-1 resin, and 2 to 3 hydroxyl groups. The present invention relates to a novel pottery clay composition containing one or two of its own water-soluble polyols.

In general, pottery has been enjoyed by many people as a high-class artistic hobby for a long time, and recently more and more people have become interested in pottery as a way to use their leisure time.

However, in many cases, pottery uses clay, which has different composition and physical properties depending on the region of production, and uses traditional techniques, and requires long-term firing at high temperatures of 1,100 to 1,400 degrees Celsius. There are various problems such as the need for a special firing kiln, and the glaze being complicated and delicate, resulting in unexpected color development. There are many aspects that require knowledge, experience, and proficiency, and it is not easy for the average person to master them.

Therefore, it is very difficult to use it for home hobby purposes or for educational purposes in elementary and junior high schools.
For this reason, there are many cases of people giving up at the introductory stage.

The present inventor has developed ceramic art, which has many subject matter, as described above.
We have been studying this for many years, believing that if we can make it easier and more familiar to the general public, it can be enjoyed by everyone from infants to adults, depending on their age and experience.

As a result, the present invention was completed.

That is, the clay composition for pottery of the present invention is aimed at elementary and junior high school students and housewives, and provides pottery clay that allows them to easily enjoy elementary pottery. By using a nearby electric or gas oven, students can learn the basic knowledge of pottery in general, such as modeling, firing, and coloring.

Furthermore, the completed work is strong and can withstand storage for a sufficiently long period of time, making it worthy of admiration.

In general, clay, oil clay, gluten clay, paper clay, polyclay, etc. have been commercially available as pottery and handicraft materials.

I have already mentioned the problems with clay, but oil clay, gluten clay, paper clay, etc. are all likely to be offered to children from infants to early elementary school students, but the finished works are not strong enough. It is weak and easily deformed, and although it is thought to be effective for learning the joy of modeling, it is impossible to experience the joy associated with firing, coloring, etc.

The final polyclay is made by mixing and kneading polyethylene, which is a thermoplastic resin, and inorganic pigments. After modeling, it is heated to about 200°C to melt the polyethylene, and then cooled. It has three stages: modeling, firing, and coloring. It can be said that the elements are almost satisfied.

However, it has almost no plasticity as a clay, and since water evaporates very quickly during modeling, it dries easily, making it completely impossible to model to a satisfactory level.

The present invention provides pottery clay with one or two thermoplastic resins selected from polyolefin resins such as polyethylene, polypropylene, and polybutene-1, and one or two water-soluble polyols having 2 to 3 hydroxyl groups. This clay composition is prepared by adding and kneading two types of clay compositions, and this clay composition has the following characteristics.

(1) It has better plasticity than raw clay, and less water evaporates during modeling, so it is possible to make detailed work that takes time, and therefore it is possible to create as many shapes as you like. be.

(2) After modeling, dry it at room temperature, then put it in a nearby oven and heat it to 30 to 120 degrees Celsius at a temperature of 120 to 170 degrees Celsius.
After firing for about a minute, the thermoplastic resin melts into the clay.
Penetrate.

Works taken out of the oven after cooling are much stronger than those made from raw clay fired at the same temperature, and do not break easily, so they can be stored and admired for a long time.

(3) Since the surface of the fired work is almost the same as that of the raw clay, it can be colored in any desired manner with glaze, varnish, enamel, lacquer, oil paint, paint, etc.

These features satisfy the three elements for enjoying pottery: modeling, firing, and coloring, and are aimed at a wide range of age groups, from elementary and junior high school students to housewives, to enjoy introductory pottery to the fullest. Many of the problems of conventional commercially available products can be solved by the clay composition of the present invention, as it allows for smooth progression to high-grade pottery.

The present invention will be described in detail below.

As the pottery clay used as the clay base material of the present invention, a wide range of clays used for general ceramic manufacturing purposes can be used.

Among these, it is desirable to select one that has particularly good plasticity and viscosity.

That is, it is important that the clay composition of the present invention has the best clay properties in the temperature range after being shaped at room temperature, dried, and then fired at a temperature of about 1700°C.

Clay that meets these purposes is produced all over the country, and can be obtained and used in various colors such as white, gray, and red.

Moreover, polyolefin resin is used as the thermoplastic resin which is the raw material of the present invention.

As the polyolefin resin, it is necessary to use one or two of polyethylene, polypropylene, and polybutene-1.

Of course, copolymer resins such as ethylene propylene copolymers can also be used as raw materials for the clay compositions of the present invention.

These resins are usually used in powder form.

If the particles are too large, the dispersion state in the clay will be coarse and it will be difficult to obtain a homogeneous work, which is unsuitable.If the particles are too small, the surface area of the resin will become large, which will reduce the plasticity. So I don't like it.

Therefore, it is appropriate that the particle size of the resin used in the present invention is about 30 to 100 mesh.

The amount of resin to be used is preferably 1 to 30 parts by weight, particularly 3 to 15 parts by weight.

If the amount used is too small, the strength of the piece after firing will be insufficient, and if it is too large, the plasticity will decrease, making it difficult to create thin shapes, and there is a risk of deformation during firing. It's inappropriate.

Furthermore, as the water-soluble polyol which is the raw material of the present invention,
Various polyols having 2 to 3 hydroxyl groups in their structure can be used.

However, after considering the safety of the handler during modeling and firing, we found that it is most appropriate to use one or both of ethylene glycol, propylene glycol, and glycerin. reached the conclusion.

The amount of these polyols used is also related to the amount of polyolefin resin used, but usually 0. It is appropriate to use 0.1 to 5.0 weight rice cakes, especially 0.2 to 3.0 weight rice cakes.

If it is used in an amount of 5% by weight or more, the amount of polyol in the work will be excessive, resulting in a decrease in strength, which is not preferable.

As mentioned above, by selecting a clay with good plasticity and viscosity, and adding an appropriate amount of polyolefin resin to it, it satisfies the three requirements of modeling, firing, and coloring. , I hope it is possible to use it.

However, the plasticity of this material inevitably decreases compared to the raw material clay, and the surface area increases due to resin contamination, so water scatters quickly during modeling, and it is difficult to create a thin model until you are satisfied with it. has some drawbacks that make it difficult to deal with.

The present inventor further improved these points and conducted research in search of a more advanced clay composition, and as a result, it was discovered that these difficulties could be completely overcome by using a small amount of a polyol having 2 to 3 hydroxyl groups. I found out.

In other words, the clay composition of the invention to which an appropriate amount of polyol has been added has extremely good plasticity and less water scatters during modeling, making it possible to create thin shapes over a sufficient amount of time. Significant shoulder advantage was observed compared to the clay composition that did not contain it.

These polyols are less likely to vaporize and scatter during firing, and most of them remain in the work, so the safety of the handler during modeling and firing is sufficiently ensured.

Next, a general method for producing the clay composition of the present invention will be described.

Pottery clay (usually contains 20 to 25 parts water by weight).

), add an appropriate amount of polyolefin resin and an appropriate amount of polyol, and knead with a kneader until it becomes sufficiently homogeneous.
If you prepare it by putting it in a container and aging it for 5 to 10 days,
A clay composition according to the invention is obtained.

Next, in order to explain the effects of the clay composition of the present invention, a reference example will be described in which the composition is shaped, fired, and colored.

(1) Take the required amount of the clay composition of the present invention, shape it, and then dry it at room temperature overnight.

Next, it is placed in an oven and gradually raised to a desired temperature (the firing temperature varies depending on the type of resin blended, but it is generally sufficient to heat it to 10 to 15° C. higher than the softening point or melting point of the resin).

For example, it is appropriate to sinter at a temperature of 130 to 140°C for polyethylene, 140 to 150°C for polybutene-1, and 160 to 165°C for polypropylene.

Processing at excessively high temperatures, such as 180 DEG to 200 DEG C., is unsuitable because some of the resin begins to decompose, making the piece porous and brittle.

), maintain that temperature for 30 to 150 minutes and bake.

After baking, if you wait for the oven to cool before taking it out, you will get Work A.

(2) After coloring work A with glaze, fest, enamel, lacquer, oil paint, paint, etc., the desired work B can be obtained by drying it at room temperature or in an oven.

(3) Water is added to the clay composition of the present invention to obtain the desired fluidity, and the resulting mixture is poured into a plaster mold.

After allowing it to dissolve for about an hour, remove the excess fluid clay part.
After drying the plaster mold, the molded product is taken out, dried overnight at room temperature, and then placed in an oven and treated in the same manner as in methods (1) and (2) to obtain desired works C and D, respectively.

The clay composition of the present invention can be obtained in various hues such as white, gray, and red depending on the type of raw material clay used, so if such clay is used as a base material, beautiful work A can be created. You can get it as is.

Furthermore, we use light-colored clay as the base clay, and add organic,
Of course, it is also possible to make colored clays by adding inorganic pigments or dyes.

The present invention will be explained below by way of examples.

Example 1 Pottery clay (red clay from Tokoname) with water content of 20% by weight 1.25
Take 1 kg and add 30 to 100 mesh polyethylene powder ioo. or (10.0% by weight based on dry clay)
and ethylene glycol10. After adding Of (1.0% by weight), the mixture is kneaded with a kneader until it becomes sufficiently homogeneous.

In this way, a clay composition containing polyethylene as a thermoplastic resin and ethylene glycol as a water-soluble polyol was obtained, and it was possible to make an excellent pottery clay that can be arbitrarily shaped for a long period of time.

Examples 2 to 11 Clay 1.25K2 with a water content of 20% by weight as in Example 1
The following various clay compositions were prepared by changing the type of thermoplastic resin and the type of polyol.

As a result, excellent pottery clay similar to that of Example 1 could be obtained in each case.

Claims (1)

[Claims] 1 Pottery clay is used as a base material, and polyethylene resin,
One or two types of polyolefin resin selected from polypropylene resin and polybutene-1 resin, and two hydroxyl groups.
Ceramic clay composition 4 containing one or two water-soluble polyols having ~3