JPH05142990A - Clay composition for handicraft - Google Patents

Abstract

PURPOSE:To provide the clay compsn. which has an adequate shape retaining property and plasticity, does not crack even after drying and has excellent preservable stability as well by compounding specific ratios of gum and alphatized grain powder and/or alphatized starch with starch powder. CONSTITUTION:The gum is compounded at 0.5 to 20 pts.wt. and the alphatized grain powder and/or alphatized starch at 1 to 20 pts.wt. with 100 pts.wt. starch. The starch includes wheat, corn, etc., the gum includes tragacanth gum, guagum, etc., the alphatized grain powder includes corn flour, wheat flour, etc., and the alphatized starch powder includes wheat, corn, etc. The dilatancy of the starch is so strong that the shape retaining property and elasticity like those of clay are lost if the compounding ratio of the gum is below 0.5 pt.wt. The cobwebbing property possessed by the gum appears if the ratio exceeds 20 pts.wt. The strength when the compsn. is dried is insufficient if the compounding ratios of the alphatized grain powder and the alphatized starch powder are below 1 pt.wt. There is no working property if the ratios exceed 20 pts.wt.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a working clay composition, and more particularly to a working clay composition characterized by blending gums with pregelatinized cereal flour and / or pregelatinized starch.

[0002]

2. Description of the Related Art Conventionally, many clays using flour are known as clay for working. For example, Japanese Examined Patent Publication No. 49-40656 discloses a clay for working which is mainly composed of wheat flour or the like, which is blended with a synthetic latex for the purpose of quickly drying and solidifying the formed image. However,
Although this work clay has excellent quick-drying properties, it can be difficult to handle because it can dry and harden during the production of the work. Also, since it uses a vinyl acetate resin as a solidifying agent, it has a unique odor.

Further, Japanese Patent Publication No. 49-4317 discloses that
A learning clay containing wheat flour as a main raw material, which is obtained by adding normal paraffin for the purpose of preventing sticking to a hand during work, is disclosed. This clay is
Since it is difficult to dry, it is easy to handle, but it takes time to dry, and even if it is dry, it is often brittle and cracks.

Further, Japanese Patent Application Laid-Open No. 60-27640 discloses a composition for color forming clay in which a powdered pigment is mixed with pregelatinized starch for the purpose of imparting color forming property. Furthermore, JP-A-60-66282 and 61-
In 29880, cornstarch is the main component,
It discloses a clay composition for crafts which comprises a vinyl acetate resin emulsion as a solidifying agent. The clays described in these publications also have a unique odor because they contain a vinyl acetate resin.

[0005] Generally, when a starch composition is mainly composed of a clay composition, there is a problem that it has a strong dilatancy, is not cohesive, and lacks the shape retention and plasticity like clay. In order to avoid such a problem, the above-mentioned JP-A-60-6628 is used.
2 and the invention disclosed in JP-A No. 61-29880, it is not preferable to use a vinyl acetate-based resin as a solidifying agent because a peculiar odor is imparted to the clay.

As a result of various studies to solve the above-mentioned problems of the prior art, the present inventors have found that gums and pregelatinized cereal flour and / or starch are contained in a fixed ratio with respect to starch as a main component. By blending with α-starch, appropriate shape retention, plasticity, and storage stability as clay can be achieved without blending a solidifying agent such as vinyl acetate resin and without heating. The present inventors have completed the present invention by finding that it is possible to produce a clay that has a slow drying rate and is easy to handle.

[0007]

That is, the present invention blends 0.5 to 20 parts by weight of gums and 1 to 20 parts by weight of pregelatinized cereal flour and / or pregelatinized starch with respect to 100 parts by weight of starches. It consists of a clay composition for crafts. Examples of the starch used in the present invention include starch obtained from wheat, corn, potato, sweet potato, tapioca, sago, rice and the like.

Examples of the gums used in the present invention include tragacanth gum, guar gum, xanthan gum, locust bean gum, karaya gum and the like. With the pregelatinized cereal flour used in the present invention,
Corn flour, wheat flour, milo flour, rye flour, rice flour, sticky rice flour, potato flour, barley flour, millet flour, potato flour, bracken flour,
It is α-gelatinized flour in which flour such as tapioca flour, bulb flour and buckwheat flour is heated and pressure-treated to adjust the α-degree to 40 to 100.

The pregelatinized starch used in the present invention is
Wheat, corn, potato, sweet potato, tapioca,
It is a pregelatinized starch obtained by heating and pressurizing starch obtained from sago, rice, etc. to adjust the pregelatinization degree to 40 to 100. In the present invention, by mixing 0.5 to 20 parts by weight of gums, 1 to 20 parts by weight of pregelatinized cereal flour and / or pregelatinized starch, and water in appropriate amounts with respect to 100 parts by weight of the starches. A work clay composition can be obtained.

If the amount of gums is less than 0.5 parts by weight,
Starch has strong dilatancy, lacks shape retention and plasticity like clay, and the effect obtained by using starch and gum together cannot be expected. Also, the amount of gums is 20
If the amount is more than the weight part, the spinnability of gums will be exhibited and the shape retention and plasticity will also be lost. Further, if the amount of the α-grain flour or the α-starch blended is less than 1 part by weight, the strength when the clay is dried is insufficient, which is not preferable, and if it is more than 20 parts by weight, the clay has a crisp texture and a textured texture. It becomes lacking in sex. If you make clay from gum and starch without adding α-grain flour or starch,
It is brittle when dried and lacks strength. In addition, when clay is made only from α-gelatinized flour or α-gelatinized starch and starch, the storage stability in a non-dried state is poor, and the α-gelatinized flour and α-gelatinized starch age,
The clay becomes crumbling and non-sticky.

The water to be blended is preferably about 50 to 100 parts by weight with respect to 100 parts by weight of starch. The work clay composition of the present invention may further contain, if necessary, 0 to 30 parts by weight of a salting-out agent and 0 to 5 parts of a wet lubricant with respect to 100 parts by weight of starch.
0 parts by weight, 0 to 30 parts by weight of a filler, 0 to 30 parts by weight of a preservative, a dye, a pH adjusting agent, an antiaging agent and the like can be added.

As the salting-out agent, sodium chloride, potassium alum, aluminum sulfate, potassium sulfate and the like can be used. Examples of the wet lubricant include glycerin, sorbitol, propylene glycol, normal paraffin, and vegetable oil. Examples of the filler include diatomaceous earth, talc, clay, silica, alumina and the like. Examples of antiseptics include benzoic acid compounds, propionic acid compounds, hydrogen peroxide and the like. As the dye, blue No. 1, blue No. 1 aluminum lake, red No. 3, red No. 3 aluminum lake, red 10
No. 2, Yellow No. 4, Yellow No. 4 aluminum lake, etc. can be mentioned, and 0 to 3 parts by weight can be added to 100 parts by weight of starch.

The clay composition for working of the present invention comprises starch 10
0.5 to 20 parts by weight of gums and 1 to 20 parts by weight of α-grain flour and / or α-starch are mixed with 0 part by weight, and if necessary, a salting-out agent, a wetting lubricant, and a filler. A preservative, a dye, a pH adjuster, an antiaging agent, etc. can be added to the composition without the heating step.

[0014]

EXAMPLES The present invention will be described in more detail below with reference to examples. Example 1 Ingredients Parts by weight Corn starch 1000 Gua gum 40 Diatomaceous earth 60 Salt 100 Pregelatinized wheat flour 70 Normal paraffin 80 Water 700 Raw materials consisting of the above components were put into a vertical mixer and stirred for about 3 minutes. The obtained clay had an excellent shape-retaining property and workability, was hardened almost one day after the production of the image, and was stable without cracking after drying. Example 2 Ingredients by weight Wheat starch 1000 Xanthan gum 25 Salt 100 Aluminum sulfate 40 Propylene glycol 30 Liquid paraffin 90 Pregelatinized waxy corn starch 20 Pregelatinized potato starch 60 Water 800 To produce clay. The obtained clay had the same excellent quality as in Example 1.

[0015]

As described above, according to the clay composition for work of the present invention, it has appropriate shape retention and plasticity as clay, does not crack even after drying, and has storage stability. An excellent clay can be obtained. Further, the drying speed is not too fast and is gentle, so that it is easy to handle. Further, since vinyl acetate resin as a solidifying agent is not used, there is no odor, and since starch is used, the color is cleaner than that of clay containing wheat flour as a main component.

Furthermore, according to the clay composition for work of the present invention, clay can be easily produced without a heating step.

Claims (1)

[Claims] 1. A clay composition for working, characterized in that 0.5 to 20 parts by weight of gums and 1 to 20 parts by weight of pregelatinized cereal flour and / or pregelatinized starch are mixed with 100 parts by weight of starch. object.