KR100831855B1 - Polymer clay and method of making the same - Google Patents

Abstract

An artificial clay, and a method for preparing the artificial clay are provided to improve adhesion, elasticity, lightweightness, color expression and tensile strength and to increase curing time. An artificial clay comprises 55-80 wt% of a poly(vinyl alcohol) aqueous solution; 0.1-1 wt% of a pigment dispersant; 0.3-15 wt% of a filling material; 1-15 wt% of a moisturizing agent; 0.1-3 wt% of a crosslinking agent; 1-8 wt% of a filler; and 3-20 wt% of poly(vinyl pyrrolidone). Preferably the poly(vinyl alcohol) aqueous solution comprises water, and 10-40 wt% of a poly(vinyl alcohol) powder dissolved in water; and the pigment dispersant is at least one selected from the group consisting of sodium hexametaphosphate, polyphosphate, polyacrylate and an alkali silicate.

Description

Artificial clay and method of making the same

The present invention relates to an artificial clay and a method of manufacturing the same, and more particularly, to an artificial clay and a method for producing the same, which has excellent adhesion, high elasticity, light weight, excellent color expressiveness and tensile property, and long curing time. will be.

In general, the clay is flexible, so that it can be easily transformed into a desired shape by hand, so that it is easy to manufacture a variety of sculptures, and when dried by natural drying, the clay is cured, and the manufactured sculptures are maintained for a long time. It is used a lot for a handicraft.

Early clays consist of high-weight inorganic substances and water collected from nature, so that the clay itself is heavy, and dried sculptures are also heavy. In addition, the ability of the minerals to contain water is short, so that the working time is short due to the rapid evaporation of water from the clay, and the surface of the sculptures is cracked or easily broken due to the reduction of moisture to maintain the binding of the inorganic particles after drying. Have.

In order to compensate for the problems of the clay, artificial clay is prepared using water-soluble natural polymers or derivatives thereof, hollow polyacrylonitrile powder, hollow microsphere powder, hollow microspheres, and not inorganic materials as fillers. Alternatively, artificial clays have been prepared by adding fillers to aqueous polyvinyl alcohol aqueous solutions, which are water-soluble polymers, and boric acid as a thickener for controlling viscosity.

However, conventionally known artificial clays have a clay and clay to make a sculpture, or when the clay-made sculpture is fixed by contact with a contact surface such as glass, the adhesion is poor, between clay and clay or between the clay and the contact surface. There was a problem that cracks occur.

In addition, the curing time is short, when children work, there was a problem that can not be easily cured to make the desired sculpture.

In addition, since the basic clay itself is not clearly expressed, there is a limit in expressing various colors desired by the user.

In order to solve the above problems, an object of the present invention is to provide an artificial clay having excellent adhesiveness, high elasticity, light weight, excellent color expression and tensile properties, and long curing time.

It is another object of the present invention to provide a method for producing the above-mentioned artificial clay.

The artificial clay of the present invention is 55 to 80% by weight polyvinyl alcohol aqueous solution, 0.1 to 1% by weight pigment dispersant, 0.3 to 15% by weight filler, 1 to 15% by weight moisturizer, 0.1 to 3% by weight crosslinking agent, 1-8 wt% filler and 3-20 wt% polyvinylpyrrolidone.

In addition, the manufacturing method of the artificial clay of the present invention is (1) mixing 55 to 80% by weight of polyvinyl alcohol aqueous solution, 0.1 to 1% by weight of a pigment dispersant and the pigment, followed by stirring; (2) adding and mixing 0.3-15 wt% filler, 1-15 wt% moisturizer and 3-20 wt% polyvinylpyrrolidone to the mixture of step (1); (3) adding and mixing 0.1 to 3% by weight of a crosslinking agent to the mixture of step (2); (4) adding 1 to 8% by weight of the filler to the mixture of step (3) and mixing; And (5) making the interior of the mixing vessel vacuum, then obtaining the final artificial clay.

Since the artificial clay according to the present invention has excellent adhesion and excellent tensile property, it is possible to make a sculpture of a desired size and shape without the occurrence of cracks, and can be fixed and stored anywhere.

In addition, the artificial clay of the present invention is significantly lighter than other artificial clays and is economical because more volume can be made even with the same capacity.

In addition, since it is light and has high elasticity, it can also be used as a play equipment when it is rounded to make a ball.

In addition, the artificial clay of the present invention has a long curing time and is also suitable for children's products.

In addition, since the artificial clay of the present invention has excellent color expressing power, it is possible to mix any two or more to make any color desired by the user, and thus to express the desired color without limitation.

The present invention will be described in detail with reference to the following examples, but the present invention is not limited to these examples.

Artificial clay of the present invention is 55 to 80% by weight polyvinyl alcohol aqueous solution, 0.1 to 1% by weight pigment dispersant, 0.3 to 15% by weight filler, 1 to 15% by weight moisturizer, 0.1 to 3% by weight crosslinking agent, 1-8 wt% filler and 3-20 wt% polyvinylpyrrolidone.

The polyvinyl alcohol aqueous solution used in the present invention is to dissolve the polyvinyl alcohol powder in water of 80 ~ 90 ℃ so that the solid content is 10 to 40% by weight. At this time, when the solid content is more than 40% by weight, it is difficult to mix the other components due to the high viscosity, if less than 10% by weight because of the problem that the clay on the hand, prepare in an amount of 10 to 40% by weight.

The amount of the polyvinyl alcohol aqueous solution used in the artificial clay of the present invention is preferably 55 to 80% by weight. This is because when less than 55% by weight, the clay is buried in the hands, elasticity and tensile strength is weak, and when it exceeds 80% by weight, the viscosity is high, workability is low, and the clay is hard, so that the housework is impossible.

Pigment dispersants are used to maintain the clarity of the color and the softness of the clay in the artificial clay produced. If the amount used is less than 0.1% by weight, the vividness of the color is reduced and the ductility of the clay is weakened.When the amount is used more than 1% by weight, the clay becomes too sticky or collapsed, so that 0.1 to 1% by weight of Use in quantity.

In the artificial clay of the present invention, the pigment dispersant may be at least one selected from the group consisting of sodium hexametaphosphate, polyphosphate, polyacrylate, and alkali silicate, but it is preferable to use sodium hexametaphosphate.

The pigment is not particularly limited in kind and amount of use, and in order to exhibit a desired color, the pigment and the amount of pigment commonly used in the art are appropriately selected and used.

The filler in the present invention uses a mixture of calcium carbonate and silica. At this time, calcium carbonate is used in an amount of 0.2 to 10% by weight in order to provide weight to the clay and to prevent evaporation of the clay due to moisture evaporation. Silica is 0.1 to 5% by weight in order to improve the relaxation between the clay and the mold. Use in amounts of%. This is a problem that the clay is collapsed when working with calcium carbonate in excess of 10% by weight, the volume per gram decreases, and when using more than 5% by weight of silica, the clay surface becomes rough and cracked There is a problem that the phenomenon is severe, when used in less than 0.1% by weight because cracks occur between the contact surface, the loosening is inferior.

As the moisturizing agent in the artificial clay of the present invention, one or more selected from the group consisting of glycerin, propylene glycol, triglycerol, polyethylene glycol and diethylene glycol is used, and a mixture of glycerin and propylene is preferably used. If the moisturizer is used in less than 1% by weight, the pot life is too short.If the moisturizer is used in excess of 15% by weight, the stickiness tends to be severe due to the collapse of the workpiece or the viscosity of the clay. It is preferable to use.

As a crosslinking agent for crosslinking polyvinyl alcohol in the artificial clay of the present invention, boric acid is used in an amount of 0.1 to 3% by weight. This is because when used in less than 0.1% by weight clay is buried in the hand, when used in excess of 3% by weight is too high to be touched by hand.

In the artificial clay of the present invention, polyvinylpyrrolidone is used in an amount of 3 to 20% by weight in order to maintain stickiness and improve adhesion between the clay and the clay. This is because when used less than 3% by weight, the adhesive strength is lowered, and when the content exceeds 20% by weight, the viscosity becomes too high and the pot life is shortened.

In the artificial clay of the present invention, microsphere powder is used as a filler. If the amount used is less than 1% by weight, it is not possible to make use of the characteristics of the lightweight clay, and when it is used in excess of 8% by weight, the clay becomes coarse and the adhesion decreases, so it is preferable to use it in an amount of 1 to 8% by weight. Do.

On the other hand, the artificial clay of the present invention may further contain a perfume in addition to the above components.

The fragrance may be used as commonly used in the art, but the capsule fragrance is used for a long lasting fragrance, the more the capsule bursts and smells to touch.

Artificial clay of the present invention containing the above components

(1) 55-80% by weight of an aqueous polyvinyl alcohol solution, 0.1-1% by weight of a pigment dispersant and a pigment, followed by stirring;

(2) adding and mixing 0.3-15 wt% filler, 1-15 wt% moisturizer and 3-20 wt% polyvinylpyrrolidone to the mixture of step (1);

(3) adding and mixing 0.1 to 3% by weight of a crosslinking agent to the mixture of step (2);

(4) adding 1 to 8% by weight of the filler to the mixture of step (3) and mixing; And

(5) making the interior of the mixing vessel in a vacuum state, and then obtaining a final artificial clay.

Vacuuming the inside of the tank in the final step in the manufacturing method is to increase the density of the clay to increase the elasticity and to make the touch when the clay is touched like a soft rubber.

 Example 1

57 kg of polyvinyl alcohol was added to the washed tank, and 0.1 kg, 5 kg, and 1 kg of oxygen preservative, pigment, and hexamethine were added to the tank, respectively, and stirred for 15 minutes.

Next, 10 kg, 15 kg, 5 kg, 1 kg, and 5 kg of calcium carbonate, glycerin, polophylene glycol, silica, and polyvinylpyrrolidone were added thereto, followed by stirring for 30 minutes or more.

1 kg of boric acid was added to the mixture, followed by stirring for 10 minutes or more.

Finally, 2 kg of fragranced filler was added and stirred for 10 minutes, and then the inside of the tank was vacuumed to obtain final clay.

[Comparative Examples 1-4]

Synthetic clay was prepared in the same manner as in Example 1, except that artificial clay was manufactured using the ingredients and contents shown in Table 1 below.

[Comparative Example 5]

The artificial clay was obtained in the same manner as in Example 1 except that the tank was not vacuumed before the final clay was obtained.

 [Test Methods]

1. Crack evaluation

8 g of artificial clay was spherical, spontaneously dried for 24 hours on a flat glass surface at room temperature, and the degree of cracking was evaluated according to the following evaluation criteria and is shown in Table 2. In the characteristic of man-made artificial clay, crackability is the most important factor in maintaining post-work model and storing workability.

<Evaluation Criteria>

◎; Excellent, ○; Good, △; Normal, ×; Bad

2. Curing time

8 g of artificial clay was spherical, and the time until the time of curing by drying naturally under the same conditions on a horizontal plane was measured and described in Table 3.

3. Elasticity Evaluation

Immediately after 8 g of artificial clay was spherically processed and after 2 hours, the height of the natural springs falling from the flat concrete ground at 1 m height was measured, and the results are shown in Table 4 below.

4. Color expression

8 g of artificial clay was spherically formed into two spheres, and when the spherical workpieces were combined, the indicated colors were evaluated according to the following evaluation criteria and described in Table 5.

<Evaluation Criteria>

◎; Excellent, ○; Good, △; Normal, ×; Bad

5. Elongation Evaluation

After preparing 2g of clay x 5cm x 1.5cm in width and length, the elongation distance to the point of cutting when measured at a rate of 2.8cm / sec in the transverse direction was measured and described in Table 6.

As can be seen from Tables 2 to 6, the artificial clay according to the present invention has excellent adhesiveness, high elasticity, excellent color expression and tensile properties, and a long curing time.

Although the present invention has been described by way of limited embodiments, the present invention is not limited to the above embodiments, and various modifications and variations are possible to those skilled in the art to which the present invention pertains. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the claims below but also by the equivalents of the claims.

Claims (16)

55 to 80 wt% polyvinyl alcohol aqueous solution, 0.1 to 1 wt% pigment dispersant, 0.3 to 15 wt% filler, 1 to 15 wt% moisturizer, 0.1 to 3 wt% crosslinking agent, 1 to 8 wt% filler And 3 to 20% by weight of polyvinylpyrrolidone. The artificial clay according to claim 1, wherein the polyvinyl alcohol aqueous solution is obtained by dissolving polyvinyl alcohol powder in water so that the solid content is 10 to 40% by weight. The artificial clay according to claim 1, wherein the pigment dispersant is at least one selected from the group consisting of sodium hexametaphosphate, polyphosphate, polyacrylate, and alkali silicate. The artificial clay according to claim 1, wherein the filler is a mixture of calcium carbonate and silica. The artificial clay according to claim 1, wherein the moisturizing agent is at least one selected from the group consisting of glycerin, propylene glycol, triglycerol, polyethylene glycol and diethylene glycol. The artificial clay according to claim 1, wherein the crosslinking agent is boric acid. The artificial clay according to claim 1, wherein the filler is microsphere powder. The artificial clay according to claim 1, wherein the artificial clay further contains a flavor capsule as a fragrance. (1) 55-80% by weight of an aqueous polyvinyl alcohol solution, 0.1-1% by weight of a pigment dispersant and a pigment, followed by stirring; (2) adding and mixing 0.3-15 wt% filler, 1-15 wt% moisturizer and 3-20 wt% polyvinylpyrrolidone to the mixture of step (1); (3) adding and mixing 0.1 to 3% by weight of a crosslinking agent to the mixture of step (2); (4) adding 1 to 8% by weight of the filler to the mixture of step (3) and mixing; And (5) making the interior of the mixing vessel in a vacuum state, and then obtaining a final artificial clay; a method for producing artificial clay, characterized in that consisting of. The method of claim 9, wherein the polyvinyl alcohol aqueous solution is a method of producing artificial clay, characterized in that the polyvinyl alcohol powder is dissolved in water so that the solid content is 10 to 40% by weight. The method of claim 9, wherein the pigment dispersant is a method of producing artificial clay, characterized in that at least one member selected from the group consisting of sodium hexametaphosphate, polyphosphate, polyacrylate and alkali silicate. 10. The method of claim 9, wherein the filler is a mixture of calcium carbonate and silica. 10. The method of claim 9, wherein the moisturizing agent is at least one selected from the group consisting of glycerin, propylene glycol, triglycerol, polyethylene glycol and diethylene glycol. 10. The method of claim 9, wherein the crosslinking agent is boric acid. 10. The method of claim 9, wherein the filler is a microsphere powder. 10. The method of manufacturing artificial clay according to claim 9, further comprising adding a fragrance between the steps (4) and (5).