KR101103849B1 - Method for manufacturing the handicraft clay and the handicraft clay made thereby - Google Patents

Abstract

PURPOSE: A method for manufacturing clay for crafts is provided to prevent dividedness or brittleness phenomenon after drying. CONSTITUTION: Solvent is heated to 75-90 degrees. The solvent is distilled water or refined water. Boric acid, glycerine, powdered PVP, powdered PVA, and antifoaming agent are successively put into in the solvent. Mixed solution is stirred by heat in a temperature keeping state for 20-60minutes. The temperature of the mixed solution is reduced to 60-65degrees. Resin is manufactured by dropping the boric acid from the mixed solution. The resin is aged for 20-30hours. The pH of clay which is finished goods is 8-9.

Description

Method for manufacturing the handicraft clay and the handicraft clay made thereby

The present invention relates to a method for producing a working clay and its clay. More specifically, it is light by mixing different viscosity, that is, low viscosity synthetic resin and high viscosity synthetic resin in the manufacturing process, and there is no cracking or cracking shape after drying, and it is stored for a long time. The present invention relates to a method for producing clay which can be easily cured at room temperature having excellent elasticity and elasticity and excellent physical properties such as moldability and feeling of tension, and clay thus produced.

In general, clay is flexible and can be easily deformed into a desired shape by hand to facilitate the production of a variety of moldings, and when dried, it is hardened hard to maintain the shape for a long time.

These clays are used by children and elementary school children to make sculptures. Basically, clay clay is used, but now artificial clays based on various synthetic resins are used.

The artificial clay is composed of synthetic resins and plasticizers, fillers, stabilizers, artificial pigments, etc., which are mostly dried in air, and the curing reaction proceeds as it is hard to use for a long time. There is an uneconomical problem to throw it away.

Conventional methods for producing artificial clay have been proposed in various ways. For example, the Republic of Korea Patent No. 107625 discloses a "method for producing a working yuto". The technical spirit of the patent is 17 to 20% of polyvinyl chloride in powder form, 14 to 25% of dimethylhexyl butyrate in liquid, 13 to 25% of dimethyl butyrate in liquid, 16 to 25% of large calcium carbonate, 16-25% of small particles of calcium carbonate and 3-5% of polydimethylmethylsiloxane in a gel state were added to a stirrer, followed by stirring to obtain a liquid composition in which each composition was mixed, and the mixed composition was placed in a container. After charging, the heat treatment was performed at about 70-90 degrees with infrared rays to produce a clay having a viscosity.

The working uto prepared by the above method is not limited to the working time because it maintains the proper viscosity at all times even if it is stored for a long time, and is easy to handle, and the finished work is cured by boiling water, and the hardened work is It can also be used as an eraser to have an effect such as convenient, but in the case of the above-mentioned Yuto is not only heavy in weight but also hassle that has to be heat treated during curing.

Another method for manufacturing artificial clay is disclosed in Republic of Korea Patent No. 435856, "Manufacturing method of natural hardening lightweight artificial clay." The patent is about 20 minutes at room temperature after mixing a composition comprising 83 to 96 parts by weight of an ethenyl acetate, 2 to 7 parts by weight of water, 1 to 5 parts by weight of sodium acetate anhydride and 0.5 to 2 parts by weight of methyl alcohol. And a composition comprising 5-14 parts by weight of the base material obtained above, 15-30 parts by weight of powder, 10-20 parts by weight of glycerin, 0.1-0.7 parts by weight of boric acid, and 1-2 parts by weight of an antifoaming agent. It is a technical configuration to manufacture by heating for 90 to about 40 minutes.

However, in the case of the artificial clay prepared by the above method, as the ethenyl acetate ester added to the large amount during the manufacture of clay is harmful to the human body, there are also disadvantages such as limitations in use and complicated manufacturing methods.

In addition, although the overall physical properties including elasticity are excellent compared to the functional yuto disclosed in the "method of manufacturing the functional yuto" in Korean Patent No. 107625, the pigments may be buried or artificial during manual operation due to the lack of elasticity and dimensional stability. When working with clay, there are problems such as poor washing power when the pigment is adsorbed on clothing and problems that the curing time is too short.

As another artificial clay, U.S. Patent 6,359,057 B1 discloses artificial clay consisting of 0.5 to 15% polyvinyl alcohol, 5 to 50% filler, 0.1 to 3% thickener, 0 to 30% moisturizer, and 20 to 70% water. have. However, the patent has a problem that the curing rate at room temperature is too slow to expect rigidity as a work after work, and starch is used as a filler, and above the gelatinization point of the starch, it loses its role as a filler and is caused by corruption. There is a problem that can cause odor.

In addition, there is a problem that can not form a multi-colored workpiece as the work clay in the white monochromatic form of the filler itself, when using other known filler, when the hollow microsphere alone is used, the specific gravity is 0.418 When using other known fillers here as a composition has a disadvantage that can not expect elasticity and dimensional stability by showing more specific gravity.

The present invention has been made in order to solve the above-mentioned problems, and the appropriate viscosity of different viscosity, that is, a low viscosity synthetic resin and a high viscosity synthetic resin to ensure the proper curing time, and does not occur when using the additives harmful to the human body It is a problem to provide a method for producing clay and a clay manufactured according to the same, which have a relatively simple manufacturing process while securing physical properties such as elasticity and dimensional stability to be secured as clay without using it.

Method for producing a working clay of the present invention that solved the above problems is (a) preparing distilled or purified water as a solvent, the solvent is heated to 75 ~ 90 ℃ and then in the solvent boric acid, glycerin, powdered polyvinyl Pyrrolidone (PVP), powdered polyvinyl alcohol (PVA), and an antifoaming agent were sequentially added, followed by heat stirring for 20 to 60 minutes homogeneously at a temperature maintaining state, and after heating to 60 to 65 ° C, dropping borax and stirring Preparing the resin by aging the obtained resin at room temperature for 20 to 30 hours;

(b) preparing a color mixing mixture of any one of a humectant selected from the group consisting of propylene glycol or glycerin or a mixture thereof, and a colorant, a preservative, and a steering agent; And

3.0 to 5.0 parts by weight of expanel (expancel) and 2.0 to 3.0 of the color mixture of step (b) with respect to 100 parts by weight of the resin of step (a) It is made up of a step of homogeneous stirring for 7 to 20 minutes by sequentially adding parts by weight.

Here, the step (a) is a step of heating the solvent to 75 ~ 90 ℃ and then heat stirring for 1 to 2 minutes by adding 0.5 to 1.5 parts by weight of boric acid per 100 parts by weight of the solvent; and after the heat stirring step, the solvent 100 8.0 to 9.0 parts by weight of glycerin and 1.0 to 1.5 parts by weight of polypyrrolidone were sequentially added to parts by weight, followed by heating for 10 to 20 minutes; and 100 parts by weight of solvent while maintaining a temperature of 75 to 90 ° C. 11 to 15 parts by weight of polyvinyl alcohol and 0.5 to 0.6 parts by weight of a defoaming agent were sequentially added, followed by thermal stirring for 40 to 90 minutes; And after the heat stirring, the temperature of the polyvinyl alcohol is completely dissolved at 60 ~ 65 ℃, after stirring borax bora 0.9 ~ 1.5 parts by weight with respect to 100 parts by weight of the solvent and then reduced to room temperature 20 ~ It is characterized by consisting of a step of aging for 30 hours.

Here, the polyvinyl alcohol is characterized by mixing a low viscosity polyvinyl alcohol and high viscosity polyvinyl alcohol in a weight ratio of 2: 8 to 4: 6.

Here, the low viscosity polyvinyl alcohol is characterized in that the molecular weight 20,000 ~ 30,000, viscosity 4.6 ~ 5.4cps.

Here, the high viscosity polyvinyl alcohol is characterized in that the molecular weight of 80,000 ~ 100,000, viscosity 20.5 ~ 24.5cps.

Here, the antifoaming agent of step (a) is characterized in that the silica-based antifoaming agent.

Here, the color mixture is characterized by mixing 2.0 to 3.0 parts by weight of the colorant, 0.1 to 0.3 parts by weight of preservatives and 0.1 to 0.3 parts by weight of the steering agent with respect to 100 parts by weight of the humectant.

Here, the resin of step (a) is characterized in that the resin is 80 to 95% after aging relative to the total weight of the resin before aging.

Here, the colorant of step (b) is characterized in that the organic or inorganic pigments.

Here, the organic pigment is characterized in that the pigment prepared from the alkyl phosphonic acid derivative.

Here, the inorganic pigment is characterized in that the pigment having an interference color such as sulfur, red, blue or green obtained by coating titanium oxide on natural mica.

Here, the final pH of the clay is characterized in that 8 ~ 9.

Here, in the step (b) it is characterized in that the addition of 1.0 to 3.0 parts by weight of the natural product extract with respect to 100 parts by weight of the humectant.

Here, the natural extract is green tea, lettuce white, licorice, Baekchul, Angelica, Jassop, Shin Ehwa, thinning, persimmon, ginseng, Baeksunpi, Jacho, Geumeunhwa, Yeongyo, Pogongyoung, Eoseongcho, Sambaekcho, Hwangbaek, Yugeunpi, Hwapi, Sojisil Characterized in that any one selected from the group consisting of.

In the present invention is prepared according to the manufacturing method disclosed above, clay is provided with a pH of 8-9.

The method for preparing the working clay of the present invention has the advantages of high elasticity, high elongation, feel, cracking and dimensional stability in three-dimensional machining, compared to the conventional method for manufacturing clay, and uses raw materials that induce environmental hormones as in the prior art. Since it is not used, the manufactured clay has an advantage that it is harmless to the human body.

In addition, the clay provided according to the present invention has the advantage that it is possible to produce a large craft work because the weight after curing is light.

In addition, the clay provided according to the present invention is soft to the touch, can be used without burying phenomenon, as well as toddlers can easily work. It does not need to be heat treated with boiling water of high temperature, there is an advantage that does not need to perform a separate hardening heat treatment is made by natural curing at room temperature.

Hereinafter, the present invention will be described in more detail.

The present invention relates to a method for producing a functional clay which is naturally cured at room temperature using a synthetic resin. The method for preparing a functional clay according to the present invention comprises (a) preparing distilled or purified water as a solvent, After heating to 90 ° C., boric acid, glycerin, powdered polyvinylpyrrolidone (PVP), powdered polyvinyl alcohol (PVA), and an antifoaming agent are sequentially added to the solvent, and then heated homogeneously for 20 to 60 minutes at a temperature maintained state. Stirring, and after heating to 60 ~ 65 ℃ dropping borax and stirring the resin obtained by stirring to room temperature after 20 to 30 hours to prepare a resin; and (b) propylene glycol or glycerin or a mixture thereof Preparing a color mixing mixture of any one of a humectant selected from the group and a colorant, a preservative, and a steering agent; And xpanel (expancel) 4.0 to 5.5 based on 100 parts by weight of the resin of step (a). Part by weight and the color mixture of step (b) 2.0 ~ 3.0 It is made up of a step of homogeneous stirring for 7 to 20 minutes by sequentially adding parts by weight.

According to the invention, the step (a) is heated to a solvent 75 ~ 90 ℃ and then boric acid 0.5 ~ 1.5 with respect to 100 parts by weight of the solvent 1 to 2 by weight Heat stirring for a minute; and after the heat stirring, glycerin 8.0 to 9.0 based on 100 parts by weight of the solvent. Parts by weight and polypyrrolidone 1.0 to 1.5 Heating by weight to 10 to 20 minutes sequentially; and after the heating step, polyvinyl alcohol 10 to 15 to 100 parts by weight of solvent while maintaining the temperature of 75 ~ 90 ℃ Part by weight and antifoam 0.5 ~ 0.6 Thermally stirring the parts by weight for 40 to 90 minutes; And after the heat stirring, after the polyvinyl alcohol is completely dissolved in the state of 60 ~ 65 ℃ reduced, borax 0.9 ~ 1.5 with respect to 100 parts by weight of the solvent Dropping the weight part by stirring and then reduced to room temperature preferably consists of a step of aging for 20 to 30 hours.

At this time, the glycerin used in the resin manufacturing step is used to promote the dispersion of the powder, the content is 8.0 to 9.0 with respect to 100 parts by weight of the solvent It is preferable to add parts by weight, if 8.0 If the weight part is less than the dispersing effect of the resin may be a problem that the final product of the clay is brittle, if more than 9.0 parts by weight may cause a phenomenon that the end product is too sticky clay. As described above, the content of glycerin is limited because the colorant added afterwards, the humectant having the same function as glycerin is mixed in the colorant mixture, which may affect the physical properties of the clay of the final product.

In addition, the polyvinyl alcohol (hereinafter referred to as "PVA") is slowly added to the solvent heated in a white powder state until the heat is completely dissolved until the stirring, the stirring time is 40 to 90 minutes, the time is 40 minutes Below, there may be PVA remaining undissolved, and if it is stirred for more than 90 minutes, the PVA is already meaningless to complete dissolution.

After the PVA is completely dissolved, it becomes a milky state, and when it is dropped with a spoon, the viscosity is enough to flow down without breaking.

If the antifoaming agent is not added during the resin production, the binding of the additive and the filler is weakened due to unnecessary bubble generation, thereby increasing the extent of the clay on the skin during work.

In the manufacturing of the resin, the heating container containing the solution transfers heat uniformly to the entire contact surface so that the resin synthesis is even. For this purpose, a method of inducing a bath is preferable, and when only a specific part is heated to high heat and convection or transfer heat of the solution is used, the resin sticks to the container wall and burns out, which leads to deterioration of the resin.

PVA content in the resin manufacturing is 11 to 15 with respect to 100 parts by weight of the solvent It is preferable to add a weight part, if less than 11 parts by weight, there is a problem that the clay as a finished product does not fall on the skin, 15 If it exceeds the weight part, it does not occur on the skin, but the stretching property of the product is weakened and it hardens in a short time. This is less than 15 parts by weight in the case of the finished product does not slow down the hardening rate, this problem is that the excellent properties of the physical properties is increased when a stable resin bond is made.

After PVA injection, when the resin production time is less than 40 minutes, the finished product is more likely to get on the hands, and the longer the production time is, the weaker this phenomenon is. However, when the amount of PVA blended to solvent is not satisfied, it is long time. No significant improvement can be obtained by stirring to dissolve the mixture.

The PVA used in the present invention is to be involved in all physical properties such as firmness, elasticity, collapse and stickiness of the final finished clay, the PVA is a low viscosity polyvinyl alcohol (hereinafter, "PVA-A It is recommended to use a mixture of high viscosity polyvinyl alcohol (hereinafter referred to as "PVA-B") at an appropriate weight ratio, and the mixing ratio of PVA-A and PVA-B is 2: 8 to 4: It is preferable to mix at the weight ratio of 6, More preferably, it mixes at the weight ratio of 3: 7.

The PVA-A uses a molecular weight of 20,000 to 30,000, a viscosity of 4.6 to 5.4 cps, and the PVA-B uses a molecular weight of 80,000 to 100,000 and a viscosity of 20.5 to 24.5 cps.

If only the PVA-A is used alone, the shape of the final product clay may be collapsed, and if the resin is manufactured using only PVA-B, the elastic force may be deteriorated. In addition, when the mixing ratio of the PVA-A and PVA-B is less than 2: 8 or more than 4: 6, there is a problem that the elastic force and ductility is lowered, and the shape of the final product clay may collapse. have.

It is preferable to maintain the pH of the resin prepared in the resin manufacturing step 8 ~ 9, in the present invention to produce the resin by the mechanism according to the molecular bonds in the production of PVA rather than using an oxidizing agent in adjusting the pH It was found that better results can be obtained in the above. When the PVA-A and PVA-B are mixed and used in an appropriate ratio, the bond with boric acid and the molecular bond with PVP are well formed. Can be represented.

On the other hand, if the proper ratio of PVA-A and PVA-B is not mixed in the resin manufacturing step, there is a problem of collapse of the final result, bleeding on the skin, poor elasticity, and broken, and more additives than necessary. Due to the existing production method that supplements the physical properties with the input, the user of the product may cause problems such as the user complains of headaches due to skin troubles and sour aroma from the incomplete resin. There is an advantage to solve this problem with the most stable compound.

Borax was added to 100 parts by weight of the solvent when the PVA was completely dissolved. After dropping 0.9 to 1.5 parts by weight, the mixture is stirred at room temperature and matured for 20 to 30 hours. At this time, when the addition amount of borax is less than 0.9 parts by weight, the sculptures and clays do not solidify and remain in shape. There may be a phenomenon on the hand, when the amount exceeds 1.5 parts by weight may be a problem that the stretching property is weak. In addition, after the borax addition, the stirring should be stirred so as to sufficiently mix, preferably 1 to 2 Stir for a minute.

After the borax is added, when the stirring is completed, the temperature of the resin is reduced to room temperature, and then aged. The ripening time is not particularly limited, but preferably aged for 20 to 30 hours. The reason for this is that the amount of the resin, which is the final product, is preferably maintained in an amount of 80 to 95% of the total amount of the resin before aging. This can be accomplished by removing it in a step.

In addition, while removing the unnecessary water during the aging process and at the same time can not be completely removed due to the antifoaming agent, there may be bubbles generated depending on the characteristics of the resin of the viscosity when stirring, there is also an effect to remove this Will be.

That is, the resin of the final product prepared in the resin manufacturing step is preferably such that the total amount of 80 to 95% of the total amount of the resin, before aging. Through this aging process, unnecessary properties of the solvent or bubbles to block the degradation of the physical properties of the final product clay.

On the other hand, the antifoaming agent used in the resin manufacturing step may be used as long as the antifoaming agent used in the preparation of the polymer compound. For example, octyl alcohol, cyclohexanol, nonionic surfactant, water soluble surfactant, silica antifoaming agent, and the like can be used. Preferably, a silica antifoaming agent is used.

According to the present invention, in the step (b), the color mixture is preferably freely mixed with respect to 100 parts by weight of the wetting agent 1.5 to 3.5 parts by weight, preservative 0.1 to 0.3 parts by weight and steering agent 0.1 to 0.3 parts by weight.

At this time, the humectant used is propylene glycol or glycerin or a mixture thereof. When the wetting agent is added in a large amount during the manufacturing of the resin of step (a), the viscosity of the gelled resin composition is released and the binding is disturbed. It is preferable.

The colorant uses an organic or inorganic pigment, and if the content is less than 1.5 parts by weight, the saturation falls, there may be a problem that the appropriate intermediate color does not come out when mixing the color, if it exceeds 3.5 parts by weight May occur, and an appropriate intermediate color may not come out during color mixing.

The organic or inorganic pigment used as the colorant may be used as long as it is a pigment used to prepare clay, preferably the organic pigment is to use a pigment prepared from an alkylphosphonic acid derivative, the inorganic pigment Is to use any one selected from the group consisting of pigments having interference colors such as sulfur, red, blue or green obtained by coating titanium oxide on natural mica.

On the other hand, the colorant may be added a fluorescent pigment or a luminescent pigment within a range that does not inhibit the present invention.

That is, the colorant can be used by appropriately selected organic-inorganic pigments, fluorescent pigments or light-emitting pigments within a range that does not inhibit the present invention.

In addition, the said preservative and steering agent do not limit the kind greatly. In the case of the preservatives, the preservatives used in the manufacture of cosmetics are selected and used appropriately, and the steering agent is selected from the flavors used as conventional flavoring agents such as fruit flavors and peppermint flavors to emit various flavors according to the manufacturer's selection. By mixing.

Here, the use of the preservatives, the steering agent, and the colorant in the preparation of the color mixture has a problem that if the preservatives are added during heat stirring, the efficacy of the preservatives is weakened and the physical properties change on the finished product and mold may grow. In the case of the colorant, when the powder is added alone during final stirring, there is a problem in that the original color is not evenly dispersed between the powder and the resin of the filler (expand cell) and the original color is lost or unevenly distributed. In addition, in the case of the steering agent may be a problem that loses the original aroma when heat is applied in the manufacturing step. Thus, the preservative, colorant and steering agent are mixed in the liquid phase through stirring with the humectant and added during the stirring of the resin and the filler.

According to the present invention, the resin of step (a) is mixed with the color mixture prepared in step (b) and the xpancell with a filler to complete the final clay.

At this time, the expanel (expancel) has a hollow microspheres having a particle size of 20 ~ 200, affects the molecular weight of the resin according to the content, the viscosity of the final product of the clay, the coagulation resistance It is possible to secure excellent physical properties such as tensile strength, water resistance, adhesive strength, solvent resistance, dispersibility, solubility, flexibility, and hydrophilicity. The addition amount is preferably mixed with 4.0 to 5.5 parts by weight based on 100 parts by weight of the resin of step (a), if less than 4 parts by weight of viscosity, coagulation resistance, tensile strength, water resistance, adhesive strength, solvent resistance and dispersibility Deterioration will occur, and if it exceeds 5.5 parts by weight, solubility, flexibility and hydrophilicity will be reduced.

By using the Xpancell as a filler, the manufacturing cost of the clay can be lowered, the weight can be reduced, the extrusion can be easily extruded, and the elastic clay can be manufactured without being easily broken.

In addition, the color mixture of the step (b) with respect to 100 parts by weight of the resin of step (a) is mixed 1.5 to 3.5 parts by weight, when the amount of the color mixture is less than 1.5 parts by weight saturation falls, color mixing There may be a problem that the appropriate intermediate color does not come out, and if it exceeds 3.5 parts by weight, there may be a phenomenon that the colorant is smeared on the hand, and the appropriate intermediate color does not come out when mixing the color.

The resin, the expanel, and the color mixture are sequentially added, followed by homogeneous stirring for 20 to 40 minutes. The clay of the finished product thus maintained has a pH of 8-9. At this time, the stirring time is a minimum time is required so that it can be fully minced, the time is 40 minutes or less is appropriate, preferably 20 to 40 minutes stirring. Here, the stirring temperature is preferably made 100 or less. If the stirring time is less than 20 minutes, the physical properties of the compositions may not be well blended. If the stirring time is more than 40 minutes, there may be a problem that deformation may occur in the physical properties of the additive excel. In addition, when the stirring temperature exceeds 100, there is a problem that the deformation of the final product occurs due to the particle deformation of the expancell, such a change in physical properties may occur the final product collapse like the porridge resin, Even when the sculpture is made from the product, the final sculpture falls on the floor.

According to the present invention, the natural product extract may be further added in the step (b), the amount of which is added to 0.5 to 1.5 parts by weight of the natural product extract with respect to 100 parts by weight of the humectant. If the amount is less than 0.5 parts by weight, it is difficult to obtain the addition effect of the natural product extract, and if it exceeds 1.5 parts by weight may affect the physical properties of the final product clay.

The natural product extract is composed of green tea, baekbaekpi, licorice, Baekchul, Angelica, Jassop, Sinyihwa, Bakhwa, Gamuk, Gosam, Baeksunpi, Jacho, Geumeunhwa, Yeongyo, Pogongyoung, Eoseongcho, Sambaekcho, Hwangbaek, Yugeunpi, Hwapi, Boji chamber It is to use any one of the extracts selected from, these can be used alone or in combination of two or more.

Here, the natural product extract may be of a viscous by the hot water extraction method obtained by hot water extraction and hot water extraction in 100 or more natural extraction target, and may also be in a fine state obtained by heating or freeze-drying the extract of the viscous . In addition, it may be an extract obtained by immersing a natural product in an organic solvent for a predetermined time and extracting the active ingredient from the natural product by osmotic pressure. In this case, too, the extract may be viscous like the extract obtained in the hot water extraction method, and may also be in a finely divided state.

Preferably it is to use an extract of the viscosity.

By further adding the natural product extract it is possible to further secure the skin moisturizing and antimicrobial that may be insufficient. This is according to the characteristics of the natural products used, for example, the natural products listed above are used as a herbal medicine to have a strong detoxification function and functional whitening ingredients.

In the present invention, as a clay prepared according to the method for producing the working clay of the present invention as described above, a clay having a pH of 8 to 9 is provided. In addition, it contains a natural product extract is provided with a clay having a whitening effect and antagonistic action.

Hereinafter, the present invention will be described in more detail with reference to preferred embodiments. However, the following examples are not intended to limit the present invention, and those of ordinary skill in the art that various substitutions, modifications, and changes can be made without departing from the technical spirit of the present invention. Will be obvious from.

[Examples 1-3]

<Resin manufacturing stage>

As shown in Table 1 below, each component was mixed in a weight ratio (unit of each component is parts by weight) to 100 parts by weight of distilled water to prepare a resin.

Resin manufacturing process is first heated distilled water to a temperature of 75 ~ 90 ℃, then boric acid is added to 1 After stirring for 10 minutes, glycerin and polypyrrolidone were sequentially added to 1.39. Heated for minutes. After the heating is completed, the polyvinyl alcohol and the antifoaming agent are sequentially added in a state of maintaining the temperature of 75 to 90 ° C., followed by thermal stirring for 40 to 90 minutes for complete dissolution. Then, separated into equal amounts in five containers, the temperature was reduced to room temperature and aged for 15 hours, 20 hours, 25 hours, 30 hours, and 35 hours.

Here, PVA was used as a mixture of PVA-A and PVA-B in a weight ratio of 3: 7.

After aging, the total amount of the obtained resin and the pH according to the aging time were measured using a pH meter, and the presence or absence of bubbles and the like remaining in the resin was observed. The results are shown in Table 2.

division Resin 1 Resin 2 Resin 3 Boric acid 0.91 1.25 1.45 glycerin 8.54 8.25 8.75 PVP 1.39 1.5 1.15 PVA 14 11.5 14.9 Silica Antifoaming Agent 0.53 0.55 0.6 borax 0.95 1.25 1.49

division Resin 1 Resin 2 Resin 3 Hum

castle

city

liver 15 hours

Yield 99.7% 98.5% 99.2% pH 8.3 8.6 8.3 bubble Trace presence Trace presence Trace presence 20 hours

Yield 94.1% 93.8% 94.3% pH 8.1 8.5 8.1 bubble - - - 25 hours

Yield 92.7% 92.8% 93.1% pH 8.1 8.5 8.1 bubble - - - 30 hours

Yield 92.53% 92.64% 92.54% pH 8.1 8.5 8.1 bubble - - - 35 hours

Yield 92.48% 92.51% 92.46% pH 8.1 8.5 8.1 bubble - - -

As a result of Table 2, the yield of the resin obtained in Examples 1 to 3 can be seen that it is good to use the obtained when aged for 30 to 30 hours, it can be seen that a small amount of bubbles exist in less than 20 hours In the case of more than 30 hours, the presence of bubbles was not confirmed, but the difference was very small when the yield of the resin was compared with that aged for 30 hours. This indicates that the remaining bubbles can be sufficiently removed in about 30 hours, and the unreacted moisture is removed in about 20 hours.

<Preparation of color mixture>

To prepare 100% by weight of preservatives 0.2% by weight of preservatives, 2.87 parts by weight of colorants and 0.2 parts by weight of a steering agent to prepare a color mixture 1, 0.29 parts by weight of preservatives, 2.87 parts by weight of colorants and 100 parts by weight of propylene glycol and The color mixture 2 was prepared by free mixing to include 0.2 parts by weight of a steering agent, and prepared by mixing freely to include 0.29 parts by weight of a preservative, 2.87 parts by weight of a colorant, 0.2 parts by weight of a steering agent, and 1.0 parts by weight of lettuce extract, based on 100 parts by weight of glycerin. Mixture 3 was prepared.

Clay Manufacturing

To prepare a clay in the composition ratio of Table 3. At this time, the resin used was prepared by mixing the crude mixture 1 to 3 prepared by using the aged 1 (3 in the resin 1) of Table 1 in Table 1 to prepare the final clay. The mixing ratio is in parts by weight.

division Example
One Example
2 Example
3 Example
4 Example
5 Example
6 Example
7 Example
8 Example
9 Resin 1 100 100 100 - - - - - - Resin 2 - - - 100 100 100 - - - Resin 3 - - - - - - 100 100 100 expancel 4.47 4.47 4.47 5.25 5.25 5.25 4.85 4.85 4.85 Color mixture 1 2.0 - - 2.8 - - 2.5 - - Color mixture 2 - 2.0 - - 2.8 - - 2.5 - Color mixture 3 - - 2.0 - - 2.8 - - 2.5

Consisting of the composition ratio of Table 3, after the addition of the xpancell to the resin, the resin and the expancell was stirred for 10 minutes, the crude mixture was added to premix (free mixing) for 10 minutes to complete the clay, the prepared clay Physical properties were measured, and the results are shown in Table 4 below.

Comparative Example 1

Artificial clay according to the method of manufacturing natural hardening type lightweight artificial clay disclosed in Korean Patent No. 10-0435856 was prepared, and its physical properties were compared and the results are shown in Table 4 below.

[Comparative Examples 2 to 3]

Commercially available clays of company A and clay clays of company B were prepared, and their physical properties were measured and compared, and the results are shown in Table 4 below.

Here, A company and B company do not list the company name, and manufactures and sells existing clay products.

<Property evaluation method>

1. Elasticity Evaluation

Immediately after 10 g of artificial clay was spherically processed and after 3 hours, the height of spring spontaneous fall from the flat concrete ground at 1 m height was measured, and the results are shown in Table 4 below. As shown in Table 4, it can be seen that the clay prepared in Examples 1 to 9 has an excellent elastic effect than the artificial clay prepared by the conventional techniques of Comparative Examples 1 to 3.

2. Specific gravity

After 10 g of artificial clay was spherical, the specific gravity was calculated in the following manner by measuring the diameter and mass.

Sphere volume = 4πr ^3/3,

Sphere density = sphere mass / sphere volume,

Specific gravity = sphere density / water density

The results for each of the Examples and Comparative Examples by calculation are shown in Table 4.

As shown in Table 4, the clays prepared in Examples 1 to 9 showed an effect of ultra light weight than the artificial clay prepared by the conventional technique according to Comparative Examples 1 to 3.

3. Dimensional stability

The diameter immediately after the 10 g artificial clay was spherically processed was measured using a Bernia caliper as a reference value, and after 3 hours of natural hardening at room temperature, the strain lengths of the vertical and horizontal diameters were calculated and shown in Table 4.

As shown in Table 4, the dimensional stability for maintaining the model after the work as an important factor in the characteristic of the work clay as the result of calculating the length of change in the vertical direction due to its own weight, the horizontal direction due to its own weight and curing rate, Examples 1 to 9 The clay in showed better dimensional stability than the artificial clay produced by the conventional manufacturing techniques of Comparative Examples 1 to 3.

4. Crack evaluation

10 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 and shown in Table 4. In the characteristic of man-made artificial clay, crackability is the most important factor in maintaining post-work model and storing workability.

⊙ Excellent ○ Good △ Normal × Bad

As shown in Table 4, the clays of Examples 1 to 9 were superior in the evaluation of crackability compared to Comparative Examples 1 to 3.

5. Touch

10g of artificial clay was continuously listed for 5 minutes to evaluate the degree of burying in the hand and listed in Table 4.

 ⊙ Excellent ○ Good △ Normal × Bad

As shown in Table 4, the texture of the clays of Examples 1 to 9 was equal to or greater than those of Comparative Examples 1 to 3.

6. Elongation Evaluation

After making 2g of clay × 5cm × 1.5cm of clay, measure the elongation distance to the point of cut when tensile at constant speed (2.8cm / sec and 20cm / sec) in the horizontal direction It was.

As shown in Table 4, Examples 1 to 9 exhibited better elongation than artificial clays prepared by the conventional techniques of Comparative Examples 1 to 3.

7. Curing time

10 g of clay was worked in a spherical shape, and the time until the time of hardening by natural drying under the same conditions on the horizontal plane was measured and described in Table 4.

As shown in Table 4, it can be seen that under the same conditions, the curing rate is superior to the conventional manufacturing techniques of Comparative Examples 1 to 3 by curing in 2 hours without dimensional deformation in the case of Examples 1 to 9.

division Elongation Dimensional stability
(△ V, cm) importance Shout
(Cm) Crack Tactile Hardening
speed
(time) 2.8 cm / sec 20 cm / sec level Perpendicular Immediately after 3 hours later room
city
Yes One 95.4 164 0.11 0.04 0.294 49 51 ⊙ ○ 0.9 2 25.8 56.9 0.00 0.00 0.425 50 51 ⊙ ⊙ 0.8 3 20.4 68.5 0.01 0.04 0.365 39 48 ⊙ ⊙ 0.9 4 30.0 93.4 0.01 0.07 0.325 46 49 ⊙ ⊙ 0.9 5 35.8 89.5 0.03 0.11 0.345 47 48 ⊙ ⊙ 1.5 6 27.0 76.8 0.01 0.08 0.365 43 49 ⊙ ○ 1.8 7 36.4 91.8 0.01 0.07 0.385 48 50 ⊙ ⊙ 0.9 8 39.8 99.1 0.05 0.16 0.426 44 46 ⊙ ⊙ 0.9 9 27.8 91.6 0.02 0.07 0.358 46 47 ⊙ ⊙ 1.5 ratio
School
Yes One 16.5 34.3 0.21 0.07 0.568 18 21 ○ △ 48 2 11.6 29.5 0.02 0.11 0.567 12 20 ○ ○ 24 3 13.8 42.7 0.35 0.79 0.556 22 23 ⊙ ○ 24

The present invention described above is not limited to the above-described embodiments, and various permutations, modifications, and changes can be made without departing from the technical spirit of the present invention. It is clear to those who have it.

Claims (15)

In the manufacturing method of the working clay,
(a) preparing distilled or purified water as a solvent, and heating the solvent to 75 ~ 90 ℃ and then in the solvent boric acid, glycerin, powdered polyvinylpyrrolidone (PVP), powdered polyvinyl alcohol (PVA), The antifoaming agent was sequentially added, followed by thermal stirring for 20 to 60 minutes in a homogeneous state of maintaining the temperature, and after the temperature was reduced to 60 to 65 ° C., the borax was dropped and the resulting resin was stirred at room temperature and then aged for 20 to 30 hours to prepare a resin. Making;
(b) preparing a color mixing mixture of any one of a humectant selected from the group consisting of propylene glycol or glycerin or a mixture thereof, and a colorant, a preservative, and a steering agent; And
Comprising a step of homogeneously stirring for 7 to 20 minutes by sequentially adding 4.0 to 5.5 parts by weight of the expanel (expancel) and 2.0 to 3.0 parts by weight of the color mixture of the step (b) with respect to 100 parts by weight of the resin of step (a). Method for producing a working clay, characterized in that. The method of claim 1,
The step (a) is the step of heating the solvent to 75 ~ 90 ℃ and heat stirring for 1 to 2 minutes by adding 0.5 to 1.5 parts by weight of boric acid per 100 parts by weight of the solvent;
After the heat stirring step, the step of heating the glycerine 8.0 to 9.0 parts by weight and polypyrrolidone 1.0 to 1.5 parts by weight with respect to 100 parts by weight of the solvent in order to heat for 10 to 20 minutes;
After the heating step, 11 to 15 parts by weight of polyvinyl alcohol and 0.5 to 0.6 parts by weight of an antifoaming agent were sequentially added to 100 parts by weight of the solvent while maintaining the temperature at 75 to 90 ° C. for 40 to 90 minutes; And
After the thermal stirring, the polyvinyl alcohol is reduced to 60 ~ 65 ℃ in a completely dissolved state, and then borax is stirred by dropping 0.9 ~ 1.5 parts by weight with respect to 100 parts by weight of the solvent and then reduced to room temperature 20 ~ 30 Method for producing a working clay, characterized in that consisting of the step of time aging. The method of claim 1,
The polyvinyl alcohol is a method for producing a working clay, characterized in that a mixture of low viscosity polyvinyl alcohol and high viscosity polyvinyl alcohol in a weight ratio of 2: 8 to 4: 6. The method of claim 3, wherein
The low viscosity polyvinyl alcohol has a molecular weight of 20,000 to 30,000, viscosity of 4.6 to 5.4cps method for producing a working clay, characterized in that. The method of claim 3, wherein
The high viscosity polyvinyl alcohol has a molecular weight of 80,000 ~ 100,000, viscosity of 20.5 ~ 24.5cps characterized in that the manufacturing method of the working clay.
The method of claim 1,
The antifoaming agent of step (a) is a method for producing a working clay, characterized in that the silica-based antifoaming agent. The method of claim 1,
The color mixture of step (b) is a method for producing a working clay, characterized in that the mixing of 1.5 to 3.5 parts by weight of colorant, 0.1 to 0.3 parts by weight of preservative and 0.1 to 0.3 parts by weight of the steering agent with respect to 100 parts by weight of wetting agent. The method of claim 1,
The resin of step (a) is a method of producing a clay clay, characterized in that the resin after the aging of 80 to 95% of the total weight of the resin before aging. The method of claim 1,
The method of producing a clay clay characterized in that the colorant of step (b) is an organic or inorganic pigment. The method of claim 9,
The organic pigment is a method for producing a working clay, characterized in that the pigment prepared from the alkyl phosphonic acid derivative. The method of claim 9,
The inorganic pigment is a method for producing a working clay, characterized in that the pigment having an interference color such as sulfur, red, blue or green obtained by coating titanium oxide on natural mica. The method of claim 1,
PH of the clay is the final finished product is a method for producing a working clay, characterized in that 8 to 9. The method of claim 1,
Method of producing a clay clay characterized in that further adding 0.5 to 1.5 parts by weight of the natural product extract based on 100 parts by weight of the humectant in step (b). The method of claim 13,
The natural product extract is composed of green tea, baekbaekpi, licorice, Baekchul, Angelica, Jassop, Sinyihwa, Bakhwa, Gamuk, Gosam, Baeksunpi, Jacho, Geumeunhwa, Yeongyo, Pogongyoung, Eoseongcho, Sambaekcho, Hwangbaek, Yugeunpi, Hwapi, Boji chamber Method for producing a working clay, characterized in that the extract of any one selected from. Claims 1 to 14, the clay is produced according to any one of the manufacturing method of claim 1, wherein the pH of the clay is a working clay, characterized in that 8 to 9.