JPS5950615B2 - Seikeizai - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a molding clay which is particularly suitable for teaching materials and which has not only the properties necessary for a molding clay but also has been improved so that it can be polished.

In the past, natural clay was used exclusively for this type of molding clay, which has traditionally been used as teaching materials in schools, etc. However, due to the well-known defects of this clay, it has since been replaced by artificial clay. Various artificial clays, such as synthetic white clay, colored clay such as green and black, and oil clay, have been developed. Painted clay is used, especially clay colored green, which is widely known as bronze clay and has been used to create works with a bronze feel.

However, these various artificial clays are still lacking (1
) Water, paper, string, wire, etc. cannot be used as a core material in the work, and even if core material is added, the cracks will be severe.

(2) It can only be used for works that are in the form of a block, and the completed work is fragile and easily broken. For example, when talking about works in the shape of a hand, it is possible to use it for works that are in the shape of a clasped hand. However, if the piece is made with the fingers spread out, the fingers can easily break.

(3) If the production work is not completed within the specified class time, it is necessary to suspend the work until the next week's class time, but in this case, the work in progress must be wrapped in cloth to prevent it from drying out If you don't wrap your work in something damp, the work will dry out, the clay won't stick to it, and it won't be possible to attach it with adhesive, so you won't be able to continue working on it and you'll have to start over. There are disadvantages that must be met.

(4) The clay of the work is powdery and makes the classroom dirty, which is not desirable.

(5) Many of the works are heavy and difficult to handle.

(6) Although it is not impossible to polish the material after molding to give it a shine, it is very brittle and the work will be damaged during polishing. Therefore, the carving process was extremely difficult and almost impossible.

Although it has not been possible to eliminate various defects and difficulties, it is unavoidable at present that school drawing and art textbooks and teacher instruction plans are being created using this material. This is the current state of affairs, and there has been a sudden increase in the number of voices requesting that this situation be improved.

In view of the above-mentioned actual situation, the present invention has begun to improve and improve the present invention, and has recently achieved a particle size of less than 150μ and a bulk specific gravity of 0.6.
Micro hollow powder 30 made of the following foamed inorganic material
~40 parts by weight and fiber powder 3 having a fiber length of 10 mm or less
Talcum powder 3 with ~13 parts by weight and a particle size of 150μ or less
1 to 60 parts by weight, 3 to 8 parts by weight of a water-soluble synthetic sizing agent alone or in combination, and water are kneaded, and the penetration is 100 to 100 parts by weight.
By adjusting it to 350, you can freely arrange it on wood, paper, string, wire, etc.

Also, no cracks will occur even if you insert the core inside. 11 It can be produced either in the form of a block or with a core inside, and the finished work has an appropriate weight and is strong enough to not break even if dropped. are doing.

111 Moreover, it has the characteristic that by applying water to the surface of the finished work and polishing it with a cloth or brush, a beautiful luster can be easily achieved.

Once the IV work has dried, molding material can be easily pasted on top of it, making it easy to continue working at any time.

v Since it is not dusty, you can keep the classroom clean.

ViIt is 40% lighter than conventional sculpting clay, making it easy to handle.

ViiDried pieces are very strong, so they are less likely to break during polishing.

ViiEven if the piece should break, it can be easily repaired by fixing the part with this molding material or using a commercially available adhesive.

Bronze finishes, which were only possible with colored clays since Ix, are possible.

It has excellent workability and texture during X-shaping, and is easy to mold.

xi After molding, the product does not shrink or crack, and the surface smoothness is extremely good.

After drying, it has a soft wood feel,
It is easy to mold by carving, and the carving is smooth. This molding clay has the following characteristics and has the necessary properties as a molding clay, and also has the ability to easily create a beautiful luster by rubbing the surface of the molded piece with cloth etc. The present invention will now be described in detail.

The fine hollow powder particles used in the present invention have a particle size of less than 150μ when passed through a 100-mesh sieve with an opening of 149μ or a finer sieve as specified in JIS, and have a bulk specific gravity of 0.6 or less. It is made of a certain foamed inorganic material, such as fine powder of shirasu, obsidian, perlite, etc., and the blending range is 30 to 40 parts by weight (hereinafter simply expressed as parts). The reason why the particle size is limited as described above is that if coarse particles of 150 μm or more are used, large hollow powder particles will appear on the surface during sculpting, resulting in a rough finish.

Furthermore, if the amount is less than 30 parts, the work will become heavy and not only will the soft feel of wood disappear, but the surface will become hard and difficult to carve. On the other hand, if the amount is increased beyond 40 parts, the surface will lose its hardness and be easily scratched, and the mechanical strength of the work will also be weakened, making it more likely to be damaged if dropped. The number was limited to ~40 copies. As the fiber powder, wood pulp powder, synthetic fiber powder, chemical fiber powder, etc. are used, and the meaning of limiting the fiber length of these fiber powders to 10 mm or less is that if the fiber length exceeds 10 mm, other various raw materials may be mixed. In some cases, clumps (commonly called clumps) occur more often due to intertwining of fibers, the distribution of fiber powder becomes uneven, the strength of the finished work decreases, clumps appear on the surface, and it becomes fluffy. This causes defects that do not result in a good finished state.

If the amount of fiber powder blended is less than 3 parts, the mechanical strength of the work will decrease, the surface of the work will crumble, and it will be difficult to work smoothly.

The reason for this is that the unfinished products that make up the material no longer function as a bond, and the work is more likely to crack as it dries.

If more than 13 parts of fiber powder is added, the fiber powders will become intertwined with each other, creating many lumps and resulting in uneven distribution, resulting in poor finish due to fluffing during sculpting work. Furthermore, wrinkles are more likely to occur, probably due to the shrinkage of the fibers.

The particle size of talcum powder must be less than 150μ, and if 150μ or more is used,
Hard roughness appears, making it impossible to perform smooth carving work, and the work becomes brittle.

Regarding the blending amount, if it is less than 31 parts, it will not be possible to obtain a fine, smooth, glossy surface with firm skin, and 6
If more than 0 parts is added, the surface of the work will become uneven, lose its luster, and become heavy, which is not desirable.

Water-soluble synthetic glues include CMC (cellulose methinorecanoleboxylate), MC (methylsenolose), P
Synthetic sizing agents such as VA (polyvinyl alcohol) and polyacrylamide are suitable.

In the case of natural starch glue, it is easy to rot and the viscosity changes, so
Natural glues are unsuitable.

The above adhesives may be used alone or in combination. There are no particular restrictions on the viscosity of the glue, but if the viscosity is too low, it will become too smooth during modeling, resulting in poor workability and plasticity, requiring a large amount of the glue, and increasing costs. Cause. Furthermore, if a material with too high a viscosity is used, it becomes sticky when kneaded with water, and when shaped by hand or with a spatula, it sticks and sticks, resulting in poor workability.

Taking the case of CMC as an example, the viscosity of a 1% aqueous solution at 25°C is 50 to 500 CPS, preferably 100 to 40 CPS.
0CPS is good. Similar results were obtained for MC. In the case of PVA alone, the viscosity is too low, so CMC
Similar results can be obtained by using it in combination with or MC. In the case of polyacrylamide, the amount added should be determined in terms of solid content. If the amount of glue added is less than 3 parts, the plasticity will deteriorate, making modeling difficult and reducing the strength of the work. do.

Moreover, if more than 8 parts is added, the stickiness becomes large, which impairs workability, and cracks are likely to occur, probably due to large shrinkage of the glue.

After mixing the above ingredients, add water and mix. In order to make a paste-like material, the amount of water added is
JISK253O “Petroleum asphalt penetration test method”
The penetration is adjusted to 100 to 350 at a temperature of 22° C., a load of 50 g, and a time of 5 seconds. The reason for this numerical limitation is that if the penetration is less than 100, it will be difficult to shape, and when carving after drying, the carving will not be smooth and the chisel will not go smoothly. On the other hand, if the penetration is increased beyond 350, the paste will become weak and difficult to model, and the shape will sag and become deformed after modeling, which is undesirable.In addition, the shrinkage will be large after drying, and the work will have air bubbles. This is because the number of particles increases, making it easy to collapse and become brittle. The molding clay of the present invention can be easily shaped into any desired shape by hand or with a spatula, dried, etc., and then the molding clay can be easily shaped into a desired shape by drying. By polishing, you can easily create a smooth surface.

When the finished work is colored with paint or poster color, it can be finished uniformly and beautifully without any spots.For coloring, dyes, pigments, etc. are first added to the molding clay of the present invention. It is possible to color the entire surface beautifully by kneading it in.

The finished work is light and strong, and will rarely be damaged by even a small amount of external force, such as dropping the work.

It also has the advantage of not causing any cracks.
The molding clay of the present invention is shaped like a rice cake and can be carved into any shape by hand or with a spatula.

Further explanation will be given below with reference to Examples and Comparative Examples.

Examples and Comparative Examples The composition materials shown in the table below are mixed using an Ishikawa-type stirrer and shaker manufactured by Ishikawa Factory Co., Ltd. to form clay of a certain hardness. After making a clenched fist work and drying it, I polished the surface and compared the various performances as shown in the table below.

[l Raw materials used in the experiment]

(1) Microscopic hollow powder (shirasu balloon) 1-A: Sachyrite YO4 Particle size range 1 to 100μ (minor amount of 75μ or more) Bulk specific gravity 0
．． 40-0.44 Manufacturer Sanki Kogyo Co., Ltd. l-B: Winlite SC-50 Particle size range 5-150μ (125-149μ, 1-
2%) Bulk specific gravity 0.30-0.35 Manufacturer Ichichi Kasei Co., Ltd. 1-C: Silicabanolene P Particle size range 1-600μ (Average particle size 165μ) Bulk specific gravity 0.17-0.21 MA Kushiro coal dry distillation Co., Ltd. (2) Fiber powder 2-A: Hardwood pulp (1DP-TT) Fiber length 1-2 mm Manufacturer Sanyo Kokusaku Pulp Co., Ltd. 2-B: Softwood pulp (NSP) Fiber length 4-6 mm Manufacturer Sanyo Kokusaku Pulp ( Co., Ltd.) 2-C: Cotton yarn (1 denier) cut product Fiber length: 10-12 mm Manufacturer: Daiwabo Co., Ltd. (3) Rock powder 3-A: Talcum powder EK-1 Particle size: 350 mesh 199.6% Path Maker - Inside and outside Tarta Co., Ltd. 3-B Talcum Powder PKP#80 Particle size 350 mesh 99.3% Pass Maker
Naigai Talc Co., Ltd. 3-C: Heavy calcium carbonate powder K2
5O particle size 32-150 mesh 61.6% 150 mesh pass 38.4% Manufacturer Asahi Koji powder material (9) 3-D: Heavy calcium carbonate powder ST7O Particle size Average particle size 2.9 μ Manufacturer Asahi Koji powder material (available) ) 3-E bentonite Tone grain size 300 mesh 98.0% pass maker
Kanto Bentonite Co., Ltd. (4) Water-soluble synthesis 4-A: CMC Sunrose SN25C particle size (1% aqueous solution, 25°C) 250 CPS Manufacturer Sanyo Kokusaku Pulp Co., Ltd. 4-B: MC Metrose SM particle size (2% aqueous solution) , 20℃) 4000CPS Manufacturer Shin-Etsu Chemical Co., Ltd. 4-C: PVA Poval 217 Particle size (4% aqueous solution, 20℃) 23CPS Manufacturer Tarare Co., Ltd. [2 Bending strength test method] (1) Press the clay into a molding machine ( A 3 mm diameter circular die is attached to the discharge port) and pressure is applied to make a clay string-like test piece with a length of about 150 mm and a diameter of 3 mm, and is air-dried.

At this time, keep the specimen straight and be careful not to bend it.

Once it is dry, put it in a dryer at 80℃±2℃ and dry it for 3
After drying for an additional hour, it is applied to a bending strength tester. (2)
Place the above test specimen on a two-handed angle with a distance of 100 mm, attach a balance pan (weight 7.7 g) with a wire hook of 0.5 mm diameter to the center, and gently place the weight on this pan. The bending strength was defined as the grain size when the test piece was broken.

[3 Degrees of Shrinkage] (1) Make a wooden frame of 150 mm x 85 mm x 10 mm depth, fill it with clay, press it down thoroughly, cut the surface with a palette knife, and smooth the surface with a rolling pin. .

(2) Remove this from the wooden frame, air dry it, and then heat it to 80℃.
Dry it in a dryer at ±2°C for 5 hours, measure the length and width, and check the shrinkage rate.

[4 Degree of cracking] (1) Roll out clay and use a stick to form a plate with a thickness of 5 mm.

(Put donut-shaped rings on both ends of the rolling pin in advance so that the thickness can be adjusted to 5 mm.) (2) Apply this to one surface of a 100 mm x 100 mm x 15 mm thick lauan board with a little water. Moisten it and place the above clay plate on it.
Gently press this surface with a rolling pin to make the clay stick to the board.

Attach the excess clay plate to the four side walls (15 mm thick) by pressing it with your hands. Furthermore, any plate-like clay that protrudes from the board is cut off with a palette knife. (3) This was air-dried, and after drying, the number of cracks of 3 mm or more and the total length of the cracks on the surface were measured and determined as the degree of cracking.

[5. Gloss output and surface roughness] [3. Degree of shrinkage] Wet the surface of the test specimen used slightly with water, rub the surface thoroughly with a woman's nylon stockings, and measure the "gloss output". Visually judge by ◎, ○, ×,
"Roughness" was also determined visually as none, medium, or large.

[6. Preparation and results of molding clay] (1) (1. Raw materials used in the experiment) are blended as shown in Table 1, water is added thereto, and thoroughly kneaded using an Ishikawa-type stirring and crushing machine.

Claims (1)

[Claims] 1 30 to 40 parts by weight of micro hollow powder particles made of a foamed inorganic material with an accuracy of less than 150μ and a bulk specific gravity of 0.6 or less, 3 to 13 parts by weight of fiber powder with a fiber length of 10 mm or less, and a particle size of 3-8 talc powder having a particle size of 150μ or less, 31-60 parts by weight, and a water-soluble synthetic sizing agent used alone or in combination 3-8
A polishable molding clay in which parts by weight and water are kneaded and the penetration is adjusted to 100 to 350.