WO2021071031A1 - Eco-friendly clay for art and preparation method therefor - Google Patents

Abstract

The present invention relates to an eco-friendly clay for art and a preparation method therefor, the eco-friendly clay comprising natural components of paper mulberry pulp or paper mulberry powder, minerals and starch. The present invention provides an eco-friendly clay for art, comprising: (a) 100 parts by weight of paper mulberry pulp or paper mulberry powder including 1wt% or less of lignin; (b) 10-15 parts by weight of powder of two or more natural minerals; (c) 20-30 parts by weight of natural calcium carbonate powder; (c) 20-30 parts by weight of a first binder including starch; (d) 20-30 parts by weight of a second binder including a mixture of one or more kinds selected from among acrylics, epoxies, celluloses, silicones and urethanes; and (e) 20-30 parts by weight of a solvent.

Description

Eco-friendly art clay and its manufacturing method

The present invention relates to an eco-friendly art clay and a method of manufacturing the same, and more particularly, to an eco-friendly art clay containing natural ingredients such as mulberry pulp or mulberry powder, minerals, and starch, and a method of manufacturing the same.

Clay, which is used as art clay, is an important tool for expressing the shape and color of objects, and is one of the important basic materials of art. The clay must have a viscosity suitable for working, and once a certain shape has been formed, the shape must be fixed. The clay should be suitable for hand-touching and should not get on your hands well. In addition, since clay is a product that you directly touch and feel, the safety of the product is also an important issue.

Clay products that are widely distributed in the current market are usually composed of 5 to 6 colors, and the material is composed of synthetic resins and PVA. However, clay made of synthetic chemicals may have a harmful effect on the human body when it is introduced into the body through skin contact, respiratory tract or oral cavity.In particular, phthalide-based plasticizers among ingredients included in craft clay are the intelligence of infants. And the risk of inhibiting growth has been reported.

In addition, the flavors and plasticizers contained in the existing craft clay have a problem that can cause skin diseases such as allergies.

Accordingly, research on a clay substitute that is harmless to the human body is being attempted, and such research is being focused on replacing existing synthetic materials with natural materials harmless to the human body, while enabling the same viscosity and color as existing clay to be realized. The situation has not yet achieved remarkable results.

In addition, in the case of the existing clay, it is produced simply to mold a certain shape, but in recent years, due to the development of hobby life and the increase of decorations using clay, the demand for functional clay is increasing, and thus technology development is required for this.

Prior art literature

Patent Literature

Republic of Korea Patent Publication No. 10-1983-0006755

Republic of Korea Patent Publication No. 10-2010-0022675

In order to solve the above-described problem, the present invention is to provide an eco-friendly art clay and a method of manufacturing the same, including paper mulberry pulp or mulberry powder, minerals, and starch.

In order to solve the above-described problem, the present invention (a) 100 parts by weight of oak pulp or oak powder containing less than 1% by weight of lignin; (b) 10 to 15 parts by weight of two or more natural mineral powders; (c) 20 to 30 parts by weight of natural calcium carbonate powder; (c) 20 to 30 parts by weight of the first binder containing starch; (d) 20 to 30 parts by weight of a second binder comprising a mixture of at least one selected from acrylic, epoxy, cellulose, silicone and urethane; And (e) it provides an eco-friendly art clay containing 20 to 30 parts by weight of a solvent.

The unit fiber length of the mulberry pulp may be 0.1mm to 3mm.

The natural mineral powder is jadeite and jadeite mixed in a weight ratio of 30 to 70: 30 to 70, respectively; And it may include a mixture consisting of one or more selected from the group of pegmatite, illite, sericite, biotite, tourmaline, noble stone, kaolin and limestone.

The eco-friendly art clay may further include at least one selected from the group consisting of cypress powder, aloes powder, lavender powder, mint powder, rosemary powder, chamomile powder, mugwort powder, green tea powder, and charcoal powder.

The solvent may be ethanol, biomass oil or water.

The natural calcium carbonate may be shell powder.

The present invention also comprises the steps of: (a) pretreating the whitewashed oak tree with an aqueous ammonia solution and an acid solution and cooking or pulverizing it to prepare a pulp or powder; (b) pulverizing two or more natural minerals to prepare a natural mineral powder; (c) washing the shell and then pulverizing to prepare a natural calcium carbonate powder; (d) preparing a first binder by mixing starch and water in a weight ratio of 2:1 to 0.5:1; (e) preparing a second binder by mixing at least one mixture selected from acrylic, epoxy, cellulose, silicone and urethane and ethanol in a weight ratio of 5:1 to 1:1; (f) 100 parts by weight of the oak pulp or powder, 10 to 15 parts by weight of the natural mineral powder, 20 to 30 parts by weight of natural calcium carbonate powder, 20 to 30 parts by weight of the first binder and 20 to 30 parts by weight of the second binder are mixed It provides a method of manufacturing an eco-friendly art clay comprising the step of.

The natural minerals are jadeite and jadeite mixed in a weight ratio of 30 to 70: 30 to 70, respectively; And it may include a mixture consisting of one or more consisting of pegmatite, illite, sericite, biotite, tourmaline, noble stone, kaolin and limestone.

In the step (f), at least one selected from the group consisting of cypress powder, aloes powder, lavender powder, mint powder, rosemary powder, chamomile powder, mugwort powder, green tea powder, and charcoal powder may be further mixed.

According to an aspect of the present invention, by adjusting the content of lignin in the mulberry pulp or mulberry powder, natural mineral powder, and starch to a binder containing 1% by weight or less, harmful chemicals It is possible to obtain an eco-friendly art clay having excellent antibacterial properties, moldability according to viscosity, and color compatibility without releasing.

1 is a schematic diagram of a method of manufacturing an eco-friendly art clay according to an embodiment of the present invention.

Hereinafter, a preferred embodiment of the present invention will be described in detail. In describing the present invention, when it is determined that a detailed description of a related known technology may obscure the subject matter of the present invention, a detailed description thereof will be omitted. Throughout the specification, when a part "includes" a certain component, it means that other components may be further included rather than excluding other components unless otherwise stated.

The present invention is intended to illustrate specific embodiments and to be described in detail in the detailed description, since various transformations may be applied and various embodiments may be provided. However, this is not intended to limit the present invention to a specific embodiment, it should be understood to include all conversions, equivalents, or substitutes included in the spirit and scope of the present invention.

The terms used in the present invention are used only to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In the present invention, terms such as include or have are intended to designate the presence of features, numbers, steps, actions, components, parts, or a combination of them described in the specification, and one or more other features, numbers, and steps. It is to be understood that it does not preclude the possibility of the presence or addition of, operations, components, parts, or combinations thereof.

The present invention (a) 100 parts by weight of mulberry pulp or mulberry powder containing less than 1% by weight of lignin; (b) 10 to 15 parts by weight of two or more natural mineral powders; (c) 20 to 30 parts by weight of natural calcium carbonate powder; (c) 20 to 30 parts by weight of the first binder containing starch; (d) 20 to 30 parts by weight of a second binder containing a mixture of at least one selected from acrylic, epoxy, cellulose, silicone and urethane in the eco-friendly art clay; And (e) it relates to an eco-friendly art clay containing 20 to 30 parts by weight of a solvent.

The eco-friendly art clay may include mulberry pulp or mulberry powder containing 1% by weight or less of lignin.

The mulberry tree is a dicotyledonous plant belonging to the Moraceae family. The bark is called heukpi (黑皮) or jopi (粗皮), and if it is processed again, white skin (白皮) can be obtained. In addition, the oak tree is essentially classified as a lignocellulosic biomass, and the lignocellulosic biomass qualitatively includes cellulose, hemicellulose, and lignin. In this case, cellulose and hemicellulose may be pulped or powdered by a certain process, for example, cooking or pulverization, and may be included as a component of art clay. The mulberry pulp or mulberry powder not only has adhesiveness, but also has excellent ventilation and a deodorizing function, thereby providing a comfortable working environment. In addition, there are various functional advantages, such as being able to alleviate atopy and various allergic symptoms.

On the other hand, since the lignin immobilizes cellulose and hemicellulose and inhibits effective processing thereof, it needs to be removed. Preferably, the content of lignin in the oak tree may be 1% by weight or less, preferably, 0.01 to 1% by weight through a certain process. If the content of lignin in the oak tree is more than 1% by weight, the yield and efficiency of the subsequent pulping process may be lowered, and the content of cellulose and/or hemicellulose contained in the pulp or powder of the oak tree is relatively reduced, so that adhesion and breathability are achieved. It can be degraded.

In addition, it is a white material with excellent water absorption properties of the pulp or powder of oak wood whose lignin content is adjusted to 1% by weight or less as described above, and when blended with the pigment, it absorbs the pigment smoothly, so that the unique color of the pigment can be satisfactorily realized. have.

The unit fiber length of the mulberry pulp may be 0.1 to 3 mm. If the unit fiber length of the mulberry pulp is less than 0.1mm, the unit fibers are arbitrarily agglomerated and the dispersibility in the art clay may decrease, and the viscosity of the art clay may increase, resulting in a decrease in workability, and if it exceeds 3mm, As the roughness of the hardened clay surface increases, it is difficult to achieve the intended appearance at the stage of designing the work.

In addition, the average particle size of the oak wood powder may be 0.04 ~ 0.08mm. If the average particle size of the mulberry powder is less than 0.04mm, the unit fibers are arbitrarily agglomerated and dispersibility in the art clay may decrease, and the viscosity of the art clay may increase, resulting in a decrease in workability, and if it exceeds 0.08mm, As the roughness of the hardened clay surface increases, it is difficult to achieve the intended appearance at the stage of designing the work.

The art clay may contain 10 to 15 parts by weight of two or more natural mineral powders. The natural mineral powder, jadeite and purgatory, respectively, 30 to 70: jade mixed in a weight ratio of 30 to 70; And one selected from the group consisting of pegmatite, illite, sericite, biotite, tourmaline, noble stone, kaolin, limestone, and a mixture of two or more of them.

Natural jade or natural jade can be classified into purgatory or jadeite according to its hardness. Such natural jade or natural jade has excellent deodorization properties and can promote the physiological activity of the human body by radiating far-infrared rays.

The jadeite is an alkali pyroxene belonging to the monoclinic system, and has a hardness of 6.5-7 and a specific gravity of 3.2-3.3. It usually forms a crystalline or fine-grained dense aggregate. Crystalline ones show the property of splitting in two directions that cross almost at right angles, but the dense ones are strong and hard to break. In addition, inorganic substances such as Si, Al, Mg, and Ca contained in the jadeite promote physiological activity and have the effect of discharging waste products from the body. In addition, the nephrite is a diastolic or tunoxomstone in which fine fibrous crystals are entangled to form a dense hard mass, with a hardness of 5.5 to 6.0 and a specific gravity of 2.9 to 3.0. The nephrite has a significantly lower hardness than jadeite. However, since the chemical composition of purgatory is similar to that of jadeite, inorganic salts contained therein promote physiological activity and can discharge waste products from the body.

As described above, since jadeite and purgatory have similar effects, they can be appropriately mixed and used in consideration of economical efficiency. For example, jadeite is somewhat superior to purgatory in the above-described performance, but is generally expensive, so jadeite and purgatory may be mixed and used in a weight ratio of 30 to 70: 30 to 70, respectively.

The pegmatite refers to a vein rock body in which very coarse crystal particles having a size of about 3 cm or more are entangled and hardened, and is also referred to as a megalithic or a macrocrystalline granite. It has almost the same composition as granite, but characteristically, the main minerals such as quartz, feldspar, and mica form ideally large crystals. The pegmatite can suppress the occurrence of decay, deterioration and mold even after a considerable time elapses after the art clay is cured, and can greatly improve workability, such as fluidity and spreadability, even during work.

The illite is a clay mineral having a plate-like structure similar to that of general muscovite mica as a particulate mineral having a clay particle size. It is known that the chemical composition is less in K and Al than in muscovite mica, but slightly more in _{Si and H 2 O.} The main component is _{a sulfur/white synthetic mineral composed of SiO 2} , Al ₂ O ₃ , K ₂ O, FeO _2, etc., and its physicochemical properties have the effect of dissipating a large amount of dissolved oxygen in water, and heavy metal ions coexisting in water. It has good adsorption property to adsorb organic ions and odors of decaying organic matter, and this adsorption property is exhibited in air and is used as a raw material for toxic gases and odor removal agents.

Said sericite is a kind of clay mineral _{, which contains potassium (K 2} O) and has a silvery white color and is called sericite because it has a strong silk gloss, and its molecular formula is KH ₂ Al ₃ (SiO ₄ ) ₃ . The sericite emits far-infrared rays and negative ions to promote metabolism, smooth blood circulation, discharge toxins, and purify waste products, and have excellent deodorization properties.

The tourmaline has pyroelectricity to attract dust when heat is applied. Tourmaline releases far-infrared rays and negative ions to alleviate blood circulation, cell activity, metabolism, fatigue, etc., prevent aging, and has excellent deodorization properties.

There are two types of precious stones, red and white, and as a characteristic of each, white has the highest far-infrared emission rate of 96% among ores. Red is about 10 times higher than tourmaline, with the maximum amount of anions generated at 24,000/cc. For example, if white and red precious stones are mixed in a weight ratio of 30 to 70: 30 to 70, respectively, by maximizing the amount of far-infrared rays and anion emission, both physiological activity enhancement and deodorizing effects can be remarkably improved.

The average particle size of the natural mineral powder may be 0.01 to 0.05 mm for pegmatite, 0.005 to 0.01 mm for jadeite or purgatory, and 0.01 to 0.05 mm for illite, sericite and biotite.

As the natural calcium carbonate, it is preferable to use a porous calcium carbonate. The porous calcium carbonate is preferably produced by pulverizing the shell and then heat-treating at 200 to 500°C, and the shell can be used without limitation as long as it is a shell shell used for edible use. It is most preferable to use oyster shells. Since the natural calcium carbonate powder has white color, it is included in the art clay to enhance the color development of white or other colors, and at the same time, it absorbs and slowly releases odor particles of natural materials to be described later. The scent of sculptures made using art clay can be made to last for a long time. At this time, it is preferable that the natural calcium carbonate powder contains 20 to 30 parts by weight.

The art clay may contain 20 to 30 parts by weight of the first binder containing starch. The first binder may be a mixture of starch and water in a weight ratio of 20 to 80: 20 to 80, respectively.

The starch is derived from natural raw materials, and when it is used as a binder for art clay, harmful chemicals such as volatile organic compounds (VOC) derived from chemically synthesized binders are not generated. You can avoid the problem of the problem.

The starch may be one selected from the group consisting of corn starch, tapioca starch, potato starch, sweet potato starch, wheat starch, and a mixture of two or more thereof, and preferably, potato starch, but is not limited thereto.

On the other hand, such a conventional binder using starch may deteriorate workability due to high viscosity when used at a high concentration. At this time, by mixing the modified starch subjected to an ester, ether, or graft reaction of the starch, and/or a starch subjected to oxidation, dextrin or enzyme treatment of the starch, workability, adhesion, and water resistance are balanced. Can be implemented.

In addition, since the long-term durability and long-term adhesion of the art clay may be deteriorated only with the first binder containing the starch, it may be supplemented by adding a chemically synthesized binder. However, the chemically synthesized binder may be synthesized from natural raw materials or an aqueous binder with reduced VOC generation so that the intended environmentally friendly effect of the first binder is not offset.

The art clay may include 20 to 30 parts by weight of a second binder including at least one mixture selected from acrylic, epoxy, cellulose, silicone, and urethane.

The acrylic binder includes 20 to 40% by weight of a water-dispersible acrylic emulsion and 20 to 40% by weight of water, and may further include a filler, a dispersant, and the like. The water-dispersible acrylic emulsion may be a polymer made of methyl methacrylate (MMA), butyl acrylate monomer (BAM), and sodium bisulfate.

The epoxy-based binder may be an epoxy compound derived from biomass oil. In the biomass oil-derived epoxy compound, the biomass oil contains a C5 to C30 alkyl chain containing at least one double bond, and the epoxy group in the biomass oil-derived epoxy compound is introduced into the carbon having the double bond. I can. The biomass oil may be at least one selected from the group consisting of soybean oil, castor oil, sunflower oil, corn oil, avocado oil, olive oil, grapeseed oil, sesame oil, nut oil, coconut oil, jojoba oil, squalane and fish oil.

The silicone-based binder may be obtained by polymerization of a silicone polymer and an epoxy compound derived from biomass oil in an aqueous phase. A silicone polymer is used as the main component, but a water-soluble eco-friendly binder can be obtained by adding and polymerizing epoxidized soybean oil and pine tree oil as natural vegetable oils. At this time, the polymerization proceeds in an aqueous phase in which water is present. For example, based on 1 liter of water, the amount of the silicone polymer used may be 5 to 20 g.

The silicone polymer is not particularly limited, and it may have at least one siloxane (-Si-O-) bond and at least one crosslinking site (double bond or triple bond) in the molecule. In this case, the crosslinking site may be combined with epoxidized soybean oil and/or pine oil, and may be selected from, for example, one or more vinyl groups.

Specifically, the silicone polymer may be selected from silicone elastomers having one or more siloxane (-Si-O-) bonds and one or more vinyl groups in the molecule. In addition, the siloxane (-Si-O-) bond may be located in a main chain, and the vinyl group may be located in a main chain and/or a side chain. Such silicone polymers can be commercially available silicone oils.

The urethane-based binder may be a water-dispersible polyurethane in which a certain amount, for example, 10 to 50% by weight of solid polyurethane particles is dispersed in water. The polyurethane may be a reaction product of an isocyanate and a polyol derived from a natural substance. The natural material-derived polyol is in the group consisting of soybean oil, castor oil, sunflower oil, corn oil, avocado oil, olive oil, grapeseed oil, sesame oil, nut oil, coconut oil, jojoba oil, squalane and fish oil, like the biomass oil. It may be one or more selected.

The art clay may further include one or more selected from the group consisting of cypress powder, aloes powder, lavender powder, mint powder, rosemary powder, chamomile powder, mugwort powder, green tea powder, and charcoal powder. Among these, cypress, which is a raw material of cypress powder, is an evergreen coniferous tree belonging to the Cypressaceae family, and cypress growing in Korea is known to emit a greater amount of phytoncide than pine and cypress. The strong scent of cypress trees is effective for sterilization, deodorization, skin care and blood circulation. In addition, the active ingredients and fragrance secreted from the cypress powder, aloes powder, lavender powder, mint powder, rosemary powder, chamomile powder, mugwort powder, and green tea powder are adsorbed to the porous calcium carbonate and then released. In the case of a sculpture produced using the product, it can emit active ingredients and fragrance for a long period of time.

Manufacturing method of eco-friendly art clay

Another aspect of the present invention, (a) pre-treating the whitewashed oak tree with an aqueous ammonia solution and an acid solution, and cooking or pulverizing it to prepare pulp or powder; (b) pulverizing two or more natural minerals to prepare a natural mineral powder; (c) washing the shell and then pulverizing to prepare a natural calcium carbonate powder; (d) preparing a first binder by mixing starch and water in a weight ratio of 2:1 to 0.5:1; (e) preparing a second binder by mixing at least one mixture selected from acrylic, epoxy, cellulose, silicone and urethane and ethanol in a weight ratio of 5:1 to 1:1; (f) 100 parts by weight of the oak pulp or powder, 10 to 15 parts by weight of the natural mineral powder, 20 to 30 parts by weight of natural calcium carbonate powder, 20 to 30 parts by weight of the first binder and 20 to 30 parts by weight of the second binder are mixed It provides a method of manufacturing an eco-friendly art clay comprising the step of.

In the step (a), the whitewood pulp or powder may be prepared by pre-treating and cooking or pulverizing the oak wood with an aqueous ammonia solution and an acid solution.

As described above, the bark of the oak tree is called heukpi (黑皮) or japi (粗皮), and if it is processed again, white skin (白皮) can be obtained. For example, after putting the trunk of a oak tree in a sealed pot and steaming it with steam for 2 hours, soak the peeled black skin in water for a day to absorb enough moisture to scrape off the black skin, then soak it in water for 8 hours, then wash it and dry it. By doing this, you can get the white skin of the oak tree.

By sequentially treating the whitewashed oak tree with ammonia water and an acid solution, the content of lignin in the oak tree can be reduced to 1% by weight or less.

First, 1 to 30% by weight of ammonia water heated to a temperature of 30 to 170 °C was introduced into the reactor under conditions of a vapor pressure or less according to the temperature of the ammonia water, and then contacted with the white-skinned oak for 4 to 6 hours. So that the lignin can be leached.

Thereafter, the fraction from which the leachate has been removed may be treated with an acid solution of 1 to 10% by weight, preferably 1 to 5% by weight at a temperature of 120 to 140°C to further remove lignin remaining in the fraction. Specifically, lignin may be moved and rearranged to the surface of the oak tree by the acid solution. The lignin droplets in the form of water droplets moved to the surface may aggregate and adhere to the surface. Such changes in structural and morphological properties of lignin increase the effective pores and specific surface area of the oak tree, thereby improving the efficiency of subsequent pulping and powdering processes.

The acid solution may include 1 to 10% by weight of one component selected from the group consisting of sulfuric acid, hydrochloric acid, nitric acid, phosphoric acid, formic acid, and a mixture of two or more thereof, and a balance of an organic solvent.

The organic solvent may be one selected from the group consisting of an ester-based, ether-based, alcohol-based, ketone-based, aromatic hydrocarbon-based solvent, and a mixture of two or more thereof, preferably, an alcohol-based solvent, and more preferably May be ethanol, but is not limited thereto.

In step (b), two or more natural minerals may be pulverized to prepare a natural mineral powder. The natural minerals, jadeite and purgatory, respectively, 30 to 70: jade mixed in a weight ratio of 30 to 70; And one selected from the group consisting of pegmatite, illite, sericite, biotite, tourmaline, noble stone, kaolin, limestone, and a mixture of two or more of them. The pulverization is performed using a conventional ore grinder, and the average particle size of the natural mineral powder is 0.01 to 0.05 mm for pegmatite, 0.005 to 0.01 mm for jadeite or nephrite, and 0.01 to 0.05 for illite, sericite and biotite. May be mm.

In the step (c), the porous calcium carbonate shell is pulverized and then heat-treated at 200 to 500°C to produce porous calcium carbonate powder. Although it can be used, it is most preferable to use the shell of oysters that occur in large quantities and have porosity.

In the step (d), starch, for example, potato starch and water are mixed in a weight ratio of 20 to 80: 20 to 80, respectively, to prepare a first binder, and in the step (e), an acrylic, epoxy, or cellulose-based binder is prepared. , A second binder is prepared by mixing at least one mixture selected from silicone-based and urethane-based and ethanol in a weight ratio of 5:1 to 1:1, and in the step (f), 100 parts by weight of the pulp or powder, 10 to 15 parts by weight of the natural mineral powder, 20 to 30 parts by weight of natural calcium carbonate powder, 20 to 30 parts by weight of the first binder, and 20 to 30 parts by weight of the second binder may be mixed to finally obtain a clay for art.

In the step (f), one selected from the group consisting of cypress powder, aloes powder, lavender powder, mint powder, rosemary powder, chamomile powder, mugwort powder, green tea powder and charcoal powder, and a mixture of two or more thereof may be further mixed. .

The kinds and effects of the natural mineral, natural calcium carbonate powder, the second binder, and other additives are the same as described above.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings so that those of ordinary skill in the art can easily implement them. In addition, in describing the present invention, when it is determined that a detailed description of a related known function or a known configuration may unnecessarily obscure the subject matter of the present invention, a detailed description thereof will be omitted. In addition, certain features shown in the drawings are enlarged or reduced or simplified for ease of description, and the drawings and their components are not necessarily drawn to scale. However, those skilled in the art will readily understand these details.

Example

1) Manufacture of pulp of mulberry tree

Cut the harvested oak tree trunks into 0.1~3mm lengths, put them in a sealed pot, steam them for 2 hours, and soak the peeled black skin in water for a day to sufficiently absorb moisture, scrape off the black skin, and soak in water for 8 hours. After placing, it was washed and dried to obtain a white mulberry bark.

While maintaining the temperature in the leaching reactor at about 60° C., the white mulberry was added to the leaching reactor, and then 15% by weight of ammonia water was supplied to the leaching reactor, and then reacted with the white mulberry for 6 hours. After 200 g of the residue from which lignin was removed from the product was added to the reactor, 2,000 ml of 50% (v/v) ethanol to which 1% (w/w) sulfuric acid was applied as a catalyst was added to the reactor, and preheated at 140° C. for 40 minutes Treated for 10 minutes. After cooling the treated reactor to room temperature, the product was taken out and washed with distilled water until the filtrate had no color change, and separated into a solid phase fraction and a liquid phase fraction using a glass filter.

100 g of the obtained solid fraction was put in a grinder and pulverized to 0.1 to 1 mm and cooked for 6 hours. After dissolving the cooked white skin in caustic soda and maintaining the temperature at a constant temperature of 20~40℃, it is aged for 48 hours so that the fibrous tissue is settled and the elasticity decreases, and then immersed in water for 24 hours, washed, dehydrated and freeze-dried. Was prepared.

2) Preparation of natural mineral powder

Pegmatite, jadeite, purgatory, illite, sericite and biotite were pulverized and pulverized with an ore grinder, respectively, and the average particle size of each was 0.01 to 0.05 mm for pegmatite, 0.005 to 0.01 mm for jadeite or purgatory, per day. In the case of light, sericite and biotite, it was set to be 0.01~0.05mm.

3) Preparation of calcium carbonate powder

Foreign substances were removed from the oyster shells collected at an oyster processing plant in Tongyeong-si, washed, and then heat-treated for 2 hours at a temperature of 300°C in a nitrogen atmosphere to obtain porous calcium carbonate. Thereafter, the calcium carbonate was pulverized to a thickness of 0.01 to 0.05 mm to prepare a natural calcium carbonate powder.

4) Preparation of binder

1 kg of potato starch was added to 4 L of water and stirred for 50 minutes while maintaining a temperature of 80 to 90°C to prepare a first binder.

Meanwhile, a polymer obtained by emulsion polymerization of methyl methacrylate (MMA), butyl acrylate monomer (BAM), and sodium bisulfate, a filler, and a dispersant were dissolved in water to prepare an aqueous dispersion acrylic emulsion.

5) Preparation of additive powder

Cleaned cypress trunks, chamomile, aloes, rosemary, mugwort, green tea leaves, and charcoal were placed in a blender and pulverized to a size of 0.05 to 0.2 mm and powdered.

6) Manufacture of eco-friendly art clay

Pegmatite 10 parts by weight, jadeite 3 parts by weight, purgatory 2 parts by weight, illite 3 parts by weight, sericite 3 parts by weight, natural calcium carbonate powder 30 parts by weight, first binder 30 parts by weight, acrylic emulsion 30 parts by weight, cypress powder 1 part by weight, chamomile powder 1 part by weight, aloes powder 1 part by weight, rosemary powder 1 part by weight, mugwort powder 1 part by weight, green tea powder 1 part by weight, charcoal powder 1 part by weight into a kneader for a certain period of time While stirring to prepare a clay for art.

Example 2

Except for omitting the acrylic emulsion in step 6), art clay was prepared in the same manner as in the above example.

Comparative Example 1

Art clay was prepared in the same manner as in the above Example, except that the black oak bark was pulverized and cooked without reacting with an aqueous ammonia and an acid solution in step 1).

Experimental Example 1

Table 1 shows the results of analyzing the solid phase fraction treated with an aqueous ammonia and an acid solution in Example 1 and the white mulberry bark of Comparative Example 1.

	Lignin (% by weight)
Example 1	0.3
Comparative Example 1	22.3

Referring to Table 1, in the case of the oak bark sequentially treated with aqueous ammonia and an acid solution according to an embodiment of the present invention, most of the lignin is removed, so that it is in a state very suitable for the pulping process even without a separate impurity removal process. Able to know.

Experimental Example 2

According to the tensile strength measurement standard of KS F3218, the art clay prepared in Examples 1 and 2 and Comparative Example 1 was adhered using a jig manufactured according to KS standard, and then cured at room temperature for 48 hours, and then a universal testing machine It was measured by pulling it up and down at a speed of 3 mm/min. The results are shown in Table 2 below.

	Adhesive strength (N/㎟)
Example 1	2.11
Example 2	1.94
Comparative Example 1	1.46

Referring to Table 2, in the case of the art clay of Examples 1 and 2, the adhesive strength was excellent compared to the art clay of Comparative Example 1 prepared without going through a predetermined pre-treatment step.

Experimental Example 3

The art clay prepared in Example 1 was coated on one side of a sheet having a size of 100 mm x 200 mm, dried, and then put into a 5 L reactor filled with a test gas (ammonia, formaldehyde), and according to the test method of KICM-FIR-1085. The deodorization rate over time was measured. The results are shown in Table 3 below.

	Time elapsed (min)	Initial concentration (μmol/mol)	Residual concentration (μmol/mol)	Deodorization rate (%)
Formaldehyde	0	82	82	-
	60	79	9	88.6
	120	76	5	93.4
	180	72	2	87.2
ammonia	0	82	82	-
	60	78	10	87.2
	120	75	4	94.7
	180	70	2	97.1

Comparative Example 2

It was carried out in the same manner as in Example 1 except that calcium carbonate was not used.

Experimental Example 4

A plate of 100 mm x 200 mm x 10 mm was prepared using the clays produced in Example 1 and Comparative Example 2, and then the degree of scent release over time was evaluated on a 5-point scale. The scent was measured at 10-day intervals for 10 experienced experimenters, and the amount of the initial scent was measured with a full score of 5 points, and the average was taken to confirm the presence of scent.

	10 days	20 days	30 days	40 days
Example 1	5.0	4.6	3.4	3.1
Comparative Example 2	5.0	3.1	1.6	0.2

As shown in Table 4, in the case of Example 1 according to the present invention, it was confirmed that a certain scent persisted even after 40 days had elapsed. On the other hand, in the case of Comparative Example 2 not using calcium carbonate, after 40 days It was confirmed that almost no scent was generated.

As described above, specific parts of the present invention have been described in detail, and it will be apparent to those of ordinary skill in the art that these specific techniques are only preferred embodiments, and the scope of the present invention is not limited thereby. will be. Accordingly, it will be said that the substantial scope of the present invention is defined by the appended claims and their equivalents.

The eco-friendly art clay of the present invention does not emit harmful chemicals, has excellent antibacterial properties, shapeability according to viscosity, and color compatibility, and thus can be usefully used in the field of clay products.

Claims (9)

1. (a) 100 parts by weight of mulberry pulp or mulberry powder containing 1 wt% or less of lignin;

   (b) 10 to 15 parts by weight of two or more natural mineral powders;

   (c) 20 to 30 parts by weight of natural calcium carbonate powder;

   (c) 20 to 30 parts by weight of the first binder containing starch;

   (d) 20 to 30 parts by weight of a second binder comprising a mixture of at least one selected from acrylic, epoxy, cellulose, silicone and urethane; And

   (e) 20 to 30 parts by weight of a solvent;

   Eco-friendly art clay containing a.
2. The method of claim 1,

   Eco-friendly art clay, characterized in that the unit fiber length of the mulberry pulp is 0.1mm to 3mm.
3. The method of claim 1,

   The natural mineral powder,

   Jade mixed with jadeite and purgatory in a weight ratio of 30-70: 30-70, respectively; And

   A mixture consisting of one or more selected from the group of pegmatite, illite, sericite, biotite, tourmaline, noble stone, kaolin and limestone;

   Eco-friendly art clay comprising a.
4. The method of claim 1,

   The eco-friendly art clay further comprises at least one selected from the group consisting of cypress powder, aloes powder, lavender powder, mint powder, rosemary powder, chamomile powder, mugwort powder, green tea powder, and charcoal powder. Eco-friendly art clay.
5. The method of claim 1,

   Eco-friendly art clay, characterized in that the solvent is ethanol, biomass oil or water.
6. The method of claim 1,

   The natural calcium carbonate is a natural art clay, characterized in that the shell powder.
7. (a) pretreating the whitewashed oak tree with an aqueous ammonia solution and an acid solution, and cooking or pulverizing it to prepare pulp or powder;

   (b) pulverizing two or more natural minerals to prepare a natural mineral powder;

   (c) washing the shell and then pulverizing to prepare a natural calcium carbonate powder;

   (d) preparing a first binder by mixing starch and water in a weight ratio of 2:1 to 0.5:1;

   (e) preparing a second binder by mixing at least one mixture selected from acrylic, epoxy, cellulose, silicone and urethane in a weight ratio of 5:1 to 1:1 with a solvent and a weight ratio;

   (f) 100 parts by weight of the oak pulp or powder, 10 to 15 parts by weight of the natural mineral powder, 20 to 30 parts by weight of natural calcium carbonate powder, 20 to 30 parts by weight of the first binder and 20 to 30 parts by weight of the second binder are mixed The step of doing;

   A method of manufacturing an eco-friendly art clay comprising a.
8. The method of claim 7,

   The natural mineral is

   Jade mixed with jadeite and purgatory in a weight ratio of 30-70: 30-70, respectively; And

   A mixture consisting of one or more consisting of pegmatite, illite, sericite, biotite, tourmaline, noble stone, kaolin and limestone;

   A method of manufacturing an eco-friendly art clay comprising a.
9. The method of claim 7,

   In the step (f), characterized in that at least one selected from the group consisting of cypress powder, aloes powder, lavender powder, mint powder, rosemary powder, chamomile powder, mugwort powder, green tea powder, and charcoal powder is further mixed. A method of manufacturing eco-friendly art clay.

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