KR101888900B1 - Eco-friendly coating composition for paper, method for manufacturing thereof and paper coated by the same - Google Patents

Abstract

More particularly, the present invention relates to a coating composition for paper which is capable of adsorbing and decomposing harmful substances emitted from paper to prevent the release of harmful substances, Which does not impair the visibility of the text printed on the paper, and a paper coated with the composition.

Description

TECHNICAL FIELD The present invention relates to an eco-friendly coating composition, a method for producing the eco-friendly coating composition, and a paper coated with the same. BACKGROUND OF THE INVENTION 1. Field of the Invention [0001]

More particularly, the present invention relates to a coating composition for paper which is capable of adsorbing and decomposing harmful substances emitted from paper to prevent the release of harmful substances, Which does not impair the visibility of the text printed on the paper, and a paper coated with the composition.

The paper, which is a pulp tributary, is made of benzene, toluene, xylene, xylene or the like due to the use of color or black and white or color ink for coloring harmful substances and colors in the initial pulp process of the sample itself Fundamentally there are inherently hazardous substances.

In recent years, papers coated with synthetic resins and polymeric materials such as polyethylene (PE), polypropylene (PP) and the like have been widely used on paper. However, environmental hormones such as lead, mercury, cadmium, formaldehyde, And are detrimental to the human body and the environment.

Accordingly, various coating compositions have been studied to solve this problem. However, even if it is difficult to remove harmful substances at an intended level or has the ability to remove harmful substances, it is easily peeled off and the ability to remove harmful substances can not be maintained for a long time. Particularly, the paper to be coated has a problem that it is very easily peeled off when the thickness of the paper is very thin and flexible and the hardness and adhesiveness of the coating layer can not satisfy an adequate level.

Accordingly, it is urgent to develop a coating material for paper which can adsorb and remove various harmful substances emitted from paper, fungus, bacteria and the like, and can maintain the ability to remove such harmful substances for a long period of time.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to provide an environmentally friendly species coating composition capable of adsorbing, oxidizing and decomposing harmful substances of paper- .

Another object of the present invention is to provide an environmentally friendly species coating composition and a method of manufacturing the same which prevent the coated post-coating agent from easily peeling off.

Another object of the present invention is to provide an eco-friendly paper coating composition which does not impair the visibility of printed characters on paper and a method for producing the same.

Also, the present invention provides an eco-friendly coated paper which is eco-friendly to the human body and environment by blocking the emission of harmful substances, and which has a long-lasting discharge-blocking property of harmful substances and excellent in visibility of various types printed on paper There is another purpose.

In order to solve the above-mentioned problems, the present invention provides a process for producing a zeolite-based mineral containing 35 to 40 parts by weight of a natural zeolitic mineral containing chabazite, 10 to 15 parts by weight of bentonite, 5 to 10 parts by weight of activated carbon, 2 to 5 parts by weight of an inorganic antimicrobial agent.

According to an embodiment of the present invention, the inorganic antibacterial agent may include citric acid silver in an amount of 10 to 15 parts by weight based on 100 parts by weight of a mixed solvent in which water and ethanol are mixed at a weight ratio of 1: 2.

The chabazite may be a granular material having an average particle size of 50 to 150 mu m.

In addition, the cationic water may include calcium, silicon, sodium, magnesium, zinc, potassium, and manganese components, and may be a saturated solution with respect to at least calcium of the components.

In addition, the coating composition may further include silica sol to improve the coating adhesion of the coated surface and the ability to remove harmful substances.

The silica sol may contain 15 to 20% by weight of silica and a residual amount of a dispersing solvent.

The silica sol may be contained in an amount of 50 to 60 parts by weight based on 100 parts by weight of the cationic water.

In addition, the silica may include 80% by weight or more of the hollow silica in the total weight of the silica.

The particle size of the hollow silica may be 30 to 50 nm.

The present invention also provides a method for producing a mixed solution comprising: (1) mixing natural zeolite-based minerals, bentonite, activated carbon, and inorganic antibacterial agent containing chabazite into cationic water to prepare a mixed solution; And (2) aging the mixed solution, wherein the mixed solution is prepared by mixing 35 to 40 parts by weight of natural zeolitic mineral containing chabazite with 100 parts by weight of cationic water, 10 to 30 parts by weight of bentonite 10 To 15 parts by weight of an inorganic antibacterial agent, 5 to 10 parts by weight of an activated carbon and 2 to 5 parts by weight of an inorganic antibacterial agent.

According to an embodiment of the present invention, the step (2) may be aged at a temperature of 60 to 65 ° C for 24 hours or more.

In addition, the natural zeolite-based mineral may be dissolved in an acidic solution and then mixed in a neutralized solution state with a large amount of an alkali solution.

The present invention also provides a paper coated with the coating composition according to the present invention.

According to the present invention, the adsorbing and decomposing effect on harmful substances is remarkably excellent, the removal efficiency is excellent, and the harmful substances are excellent in blocking ability as the harmful substances can not be released out of the coating layer coated with the composition. In addition, even though it is coated on very thin paper, since it has very excellent coating property and adhesion property, it can exhibit removal and blocking ability of harmful substances for a long time according to the load. Further, since the visibility of pictures, type and the like printed on paper is not lowered, it can be widely applied as an environmentally friendly coating agent for paper used for various purposes.

1 is a schematic view showing a process for producing a coating composition liquid according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail so that those skilled in the art can easily carry out the present invention. The present invention may be embodied in many different forms and is not limited to the embodiments described herein.

The eco-friendly coating composition according to the present invention comprises 35 to 40 parts by weight of a natural zeolite-based mineral containing chabazite, 10 to 15 parts by weight of bentonite, 5 to 10 parts by weight of activated carbon, 2 to 5 parts by weight.

First, each component included in the coating composition according to the present invention will be described in detail.

The coating composition comprises natural zeolitic minerals including bentonites, bentonites, activated carbon, inorganic antibacterial agents and cationic water.

The natural zeolite-based mineral containing the chabazite is a silicate mineral having a three-dimensional network structure. Since a pathway capable of containing a cation or a water molecule is present in the crystal structure, a harmful component is drawn into the inner passage to remove harmful components And may be useful for the removal of heavy metals such as heavy metals by causing trapping and sedimentation of cation exionge capacity particles such as heavy metals. In addition, the deodorizing and deodorizing effect can be remarkably improved by binding Ca2 + ions and counter ions which are dissolved in the cation water contained in the composition according to the present invention, and benzene, toluene, xylene, Various harmful substances such as xylene can be adsorbed.

The above-mentioned chabazite is particularly suitable for removing acidic harmful components by providing a large number of calcium, aluminum, potassium and the like. On the other hand, the chabazite exhibits optical uniaxiality, and thus may be more suitable for paper coating agents. If another type of zeolite having optical biaxiality, for example, mordenite, is used as a coating agent for paper, there is a problem in that the printed characters on the paper may be considerably deteriorated in visibility such as spreading.

The zeolite-based mineral is preferably a natural zeolite-based mineral. In case of synthesized zeolite, formaldehyde (HCHO), which is a harmful substance to human body, may be released, so that there is a problem that the coating composition releases harmful substances rather.

According to a preferred embodiment of the present invention, the natural zeolite mineral may be a granular material having an average particle size of 50 to 150 μm. If a natural zeolite mineral having an average particle size of less than 50 탆 is dispersed and dispersed in a coating solution due to its low dispersibility, there is a problem that a portion coated with a chaebolite may not exist when coated on paper have. When the average particle diameter exceeds 150 탆, there is a problem that when coated on thin paper, it can be easily removed due to the flexibility of the paper.

On the other hand, the natural zeolite-based mineral may further include zeolite-based minerals such as clinoptilolite. However, in this case, since the visibility of the text printed on the paper can be lowered, it is preferred that only the zeolite- It is good to include.

Next, the bentonite will be explained.

The bentonite mainly consists of montmorillonite beadellite-based smectite, and is a fine clay having properties such as swelling property, adsorption property and ion exchange property. Bentonite is produced by the action of volcanic rocks and hydrothermal alteration, and has excellent adsorption properties on drilling-type water-repellent agents, soil remediation agents, paints, pesticides, decolorizing agents and formaldehyde-based heavy metals. In addition, it contains cationic fine particles having fine nano-scale such as calcium, iron, magnesium, potassium, manganese, germanium, selenium and silicon and has a positive effect on the heavy metal adsorption reaction of cesium, strontium, lead, palladium, Adsorptivity and swelling property, and can also help to smell harmful substances such as ammonia and toluene.

In addition, the bentonite may include at least one of sodium (Na) bentonite and calcium (Ca) bentonite, and higher swelling sodium (Na) bentonite is more preferable for the desired physical property. When sodium (Na) bentonite is treated with a vapor or solution containing harmful components, the water molecules contained in the solution can penetrate between the bentonite plates and swell so that the boundary between the plate and the plate can be separated, It can have an effect of adsorbing and removing toxic substances. On the other hand, the bentonite can also affect the coating properties of the coating composition and can manifest the function of allowing each component in the composition to adhere and bond to each other.

Next, the activated carbon will be described.

The activated carbon has a strong adsorption property, and most of the constituent materials are carbonaceous materials. The adsorbent absorbs gas or moisture, or is used as a decolorizing agent. The activated carbon is treated with chemicals such as zinc chloride or the like to dry wood, briquettes, Can be manufactured.

Since the activated carbon is an aggregate of mesophase-developed carbon, mesopores are formed in the molecular form and have a large surface area, it is an excellent filter material in terms of physical properties of adsorption force. Therefore, chlorine and various organic compounds Removal, chromaticity, and improvement of turbidity. It has an excellent effect for adsorbing and removing organic substances that cause taste, color and odor, and can adsorb and remove ammonia, nitrate, chlorine, phenol, tannin and the like.

In particular, zeolite-based minerals and bentonites can easily adsorb and remove harmful substances having low molecular weight such as formaldehyde as the micropore develops. However, there is a problem in that adsorption and removal ability of the substances having a higher molecular weight are lowered. However, as the mesopores, that is, the pores having a pore diameter of more than 2 nm, are well developed, the activated carbon has an advantage that the harmful substances having a relatively large molecular weight can be easily removed through the activated carbon. The activated carbon may have an average particle diameter of 1 to 500 μm, preferably an average particle diameter of 100 to 300 μm, from the viewpoint of coatability.

Next, the inorganic antibacterial agent may be a conventional inorganic antibacterial agent, preferably silver nano-colloid. The silver nano-colloid may contain 10-15 parts by weight of silver citrate per 100 parts by weight of a mixed solvent of water and ethanol. If citric acid is contained in an amount less than 10 parts by weight, the antibacterial ability and deodorizing ability may be significantly deteriorated. If citric acid is contained in excess of 15 parts by weight, complete dissolution of citric acid is difficult, have. The mixed solvent is preferably mixed in a weight ratio of water: ethanol = 1: 1.9 to 2.2, more preferably 1: 2, from the viewpoint of easily dissolving citric acid silver.

The average particle diameter of the silver nanoparticles contained in the silver nanocolloid is 4 to 12 nm, and the number of dispersed particles according to the following formula (1) with respect to the particle diameter of the silver nanoparticles is 15% or less. When the composition according to the present invention is coated on paper, And the peeling of the silver nanoparticles can be remarkably reduced, which has an advantage that the antimicrobial property and deodorization property can be increased for a long period of time. If the average particle diameter of the silver nanoparticles is less than 4 nm, there is a problem that the particles can be easily peeled off after coating the fibers. If the average particle diameter exceeds 12 nm, the properties of the desired level may not be exhibited . In addition, when the number of the dispersed phase is more than 15% with respect to the silver nanoparticle size, the desorption of the nanoparticles is remarkably increased and the physical properties such as antibacterial property can be remarkably reduced.

[Equation 1]

Next, the cation water is prepared by dissolving a water-soluble mineral component (any one or more of Ca, Si, Na, Mg, Zn, K, and Mn) A solvent prepared by dissolving the water-soluble minerals with acidic ionized water electrolyzed at 54 to 65 Hz in water, may be at least a highly alkaline ionized water in which the calcium (Ca) component is saturated. In the ionized water, at least the calcium component may be contained in a saturated state, whereby the effect of removing the desired harmful components can be further improved.

In the coating composition according to the present invention, 35 to 40 parts by weight of natural zeolite-based mineral containing chabazite, 10 to 15 parts by weight of bentonite, 5 to 15 parts by weight of activated carbon, And 2 to 5 parts by weight of an inorganic antibacterial agent. If the content ratio of each component is unsatisfactory, there is a problem that the effect of removing a desired harmful substance may be remarkably reduced and / or durability may be lowered. Particularly, when the natural zeolite-based mineral is contained in an amount exceeding 40 parts by weight, the coating property of the coating composition can be remarkably reduced, and if it is less than 35 parts by weight, the effect of removing, adsorbing and blocking the harmful substances have. When bentonite is contained in an amount of less than 10 parts by weight, removal performance against a desired component such as ammonia is lowered, and components such as carbazite in the coating composition are easily removed, which may cause a problem of durability deterioration have. Also, if the bentonite is contained in an amount exceeding 15 parts by weight, the coating properties are remarkably reduced, and problems such as deterioration in adhesive strength and peeling may occur. When the amount of the activated carbon is less than 5 parts by weight, the desired ability to remove a desired harmful substance having a relatively large molecular weight may be markedly deteriorated. If the amount is more than 10 parts by weight, problems such as deterioration in coating properties, .

On the other hand, the above-mentioned coating composition can exhibit coating adhesiveness in a sol state, and bentonite, which is one component, can improve the coating adhesion between the components in particular, but the paper to be coated is very thin, When the paper is repeatedly warped due to this size, cracking or peeling may easily occur in the coating layer, so that the performance of removing harmful substances can not be maintained for a long period of time. Further, recently, in the case of coated paper coated with a synthetic paper or a synthetic resin, the surface is softer than general pulp paper, and it is difficult to exhibit sufficient adhesive performance.

According to a preferred embodiment of the present invention, the coating composition may further include silica sol in order to improve the coating adhesion of the coated surface and the ability to remove harmful substances. Particularly, silica is a porous material in which mesopores are developed, and is suitable for adsorption of harmful compounds having a large molecular weight, which is difficult to adsorb to natural zeolite or bentonite, and thus the ability to remove harmful substances can be further improved.

The silica sol is a sol solution containing 15 to 20% by weight of silica and a residual amount of a dispersing solvent. If the content of silica in the silica sol is less than 15% by weight, improvement in adhesion performance at a desired level, It is difficult to expect the effect of the removal performance improvement. In addition, if silica is contained in an amount exceeding 20% by weight, the coating property of the coating composition may be deteriorated. The above-mentioned dispersion solvent is suitable for dispersing silica in a sol state and can be used without limitation in a known solvent. For example, dimethylformamide, dimethylsulfoxide and the like can be used alone or in combination.

The silica sol may be included in the coating composition in an amount of 50 to 60 parts by weight based on 100 parts by weight of the cationic water. There is a problem that cracks may be generated or exfoliated in the solidified coating layer after coating on a paper in which silica sol is contained in an amount of less than 50 parts by weight based on 100 parts by weight of cationic water. Further, if the silica sol is contained in an amount exceeding 60 parts by weight, the coating property of the coating composition may be deteriorated.

On the other hand, the silica included in the silica sol may include 80% by weight or more of the hollow silica in the total weight of the silica. The hollow silica includes a hollow portion inside the cavity and surrounds the hollow portion. The harmful substance introduced into the channel to which the porous pores and pores of the shell portion are connected moves and can be adsorbed and removed from the hollow portion . Since the silica is particularly excellent in the ability to remove water, the moisture adsorbed on the silica can be more easily dissolved in the pores of the shell to dissolve harmful substances and move them together toward the hollow portion. The average particle diameter of the hollow silica may be 30 to 50 nm, and the average particle diameter of the hollow silica may be 5 to 20 nm. If the average particle diameter of the hollow silica is less than 30 nm, the dispersibility may be deteriorated and the improvement of the removal ability of the harmful substances may be insignificant. If the average particle size of the hollow silica exceeds 50 nm, there is a problem that the adhesion performance may be lowered. In addition, if the hollow particle diameter is less than 5 nm, the persistence of the removal of harmful substances through silica may be weakened. In addition, if the hollow particle diameter exceeds 20 nm, the thickness of the shell portion may be decreased to cause collapse of the shell portion, so that the hollow silica may not be able to perform moisture absorption, removal of harmful substances, have.

The shape of the hollow silica may be spherical. This is because when silica is spherical or polyhedron, dispersibility is better than when it is spherical or polyhedron, it may be more advantageous to exhibit uniform adhesion over the entire surface when coated on paper.

According to a preferred embodiment of the present invention, in order to improve adhesion and coatability, it is preferable that the particle size of bentonite is similar to that of silica in the case of a coating composition comprising silica sol. Accordingly, the bentonite may have a particle diameter of 30 to 50 nm, more preferably, exhibits improved coating and adhesion properties, and if the particle diameter is out of the above range, the degree of improvement of physical properties may be insignificant.

Meanwhile, the coating composition may further comprise 1 to 2.5% by weight of at least one of a dispersing agent, a foaming agent and a defoaming agent.

The dispersing agent serves to control the lubricity and flowability, and it is preferable to use an acrylic acid copolymer. If the dispersing agent is used in excess, the dispersing speed is increased. When the coating agent is coated on the substrate, the penetration becomes too much to cause a bad coating, and if the dispersing agent is used in too small amount, the dispersing ability becomes poor. In addition, the foaming agent can be used to make the coating layer as a porous foam coating layer, and at least one selected from the group consisting of an azo-based compound, a nitroso-based compound and a sulfonylhydrazide-based compound can be selected and used. The defoaming agent plays a role of removing bubbles generated in the composition and may be a defoaming agent used in a conventional coating solution, and as a non-limiting example, octyl alcohol, cyclohexanol, other higher ethanol, ethylene glycol, sor A nonionic surfactant containing a nonionic fatty acid ester as a main component, and the like can be used.

If the content of each component is less than 1% by weight, the physical properties to be embodied can not be exhibited. If the content exceeds 2.5 parts by weight, a foamed coating layer having a stable cell structure can be obtained due to excessive foaming There may be a problem that the mechanical properties of the coating layer are remarkably deteriorated or the coating property is deteriorated.

The coating composition may further comprise 10 to 15% by weight of a vegetable fragrance extract, and the vegetable fragrance extract may be selected from the group consisting of pine, pine, green tea leaves, herb and Japanese white pine. Since the extract can be extracted from the plant material by a conventional plant extraction technique, the production method of the extract is not particularly limited.

The production method of the coating composition will be described in more detail. However, the present invention is not limited by the following manufacturing method.

(1) a step of mixing a natural zeolite-based mineral, bentonite, activated carbon, and an inorganic antibacterial agent containing chabazite into cationic water to prepare a mixed solution S100); And (2) aging the mixed solution (S200), wherein the mixed solution is prepared by mixing 35 to 40 parts by weight of a natural zeolitic mineral containing chabazite with respect to 100 parts by weight of cationic water, 10 to 15 parts by weight of bentonite, 5 to 10 parts by weight of activated carbon and 2 to 5 parts by weight of an inorganic antibacterial agent.

First, in step (1) according to the present invention, a step of mixing a natural zeolite-based mineral including bentonite, bentonite, activated carbon, and an inorganic antibacterial agent with cation water to prepare a mixed solution is performed, 35 to 40 parts by weight of a natural zeolitic mineral containing chabazite, 10 to 15 parts by weight of bentonite, 5 to 10 parts by weight of activated carbon and 2 to 5 parts by weight of an inorganic antibacterial agent per 100 parts by weight of water.

The compositional ratio of each component and each component is the same as that described above and is omitted. In addition, the natural zeolite-based mineral may be dissolved in an acidic solution and then mixed in a neutralized solution state with a large amount of an alkali solution.

Next, in step (2) according to the present invention, the step of aging the mixed solution is performed.

According to a preferred embodiment of the present invention, the step (2) can be aged at a temperature of 60 to 65 ° C for more than 24 hours, more preferably 24 to 48 hours, And the coating property can be improved.

The surface of the natural zeolite-based mineral, bentonite, and activated carbon containing chabazite in the above-described composition according to the present invention is in a highly activated state during the nano-liquefaction process, and the pores capable of adsorbing harmful substances and the functional groups capable of chemically interacting It is possible to form a strong and thin layer with nano-sized pores after moisture is evaporated. Through this, harmful substances can be adsorbed and removed by physicochemical interaction of pores and chemical functional groups of the coating layer formed on the paper surface with harmful substances. In addition, since the above-mentioned coating composition may be in a sol state, it may have a certain degree of viscosity, and the adsorbed harmful substances may adhere to the coating layer for a long time in a state of being adsorbed on the coating layer due to stickiness on the sol. Furthermore, due to the surface functional groups of the components of the thin coating layer coated on the surface of the paper, the reactive radicals can be formed by reacting with the harmful substances. The active radicals can oxidize and decompose harmful substances emitted from the paper.

Meanwhile, the present invention includes a paper having a coating layer of the present invention coated on at least one side of a paper sheet and then having a coating layer for removing harmful substances including a hardened coating layer.

The paper may be a known paper, whether or not the material is made of a natural material, a synthetic material, or a separate synthetic resin coating layer on the produced paper.

The method of coating the coating composition according to the present invention on a paper surface can be carried out by a conventional method. Thus, the present invention is not limited thereto, and as a non-limiting example, a gravure steel rubber roller rotating dot thin film coating method . The coating method can be selectively changed according to the area, material, etc. of the paper, and the thickness at the time of coating can be selected depending on the material of the paper, the degree of physical properties to be expressed, and the like.

The coating composition may be applied to the paper surface by a conventional method and then further dried. The drying process can be performed at a temperature of 50-180 ° C. If a volatile organic compound is generated during the drying process at a temperature exceeding 180 ° C, a harmful component rather than a desired harmful component may be generated Or the paper is ignited.

The present invention will now be described more specifically with reference to the following examples. However, the following examples should not be construed as limiting the scope of the present invention, and should be construed to facilitate understanding of the present invention.

The present invention will now be described more specifically with reference to the following examples. However, the following examples should not be construed as limiting the scope of the present invention, and should be construed to facilitate understanding of the present invention.

≪ Example 1 >

38 parts by weight of chabazite having an average particle diameter of 120 占 퐉, 13 parts by weight of bentonite having an average particle diameter of 40 nm, 6 parts by weight of activated carbon having an average particle diameter of 250 占 퐉 and 100 parts by weight of an inorganic antibacterial agent 3 parts by weight of silver nano-colloid having an average particle diameter of 11 nm and a dispersion coefficient of 13% with respect to the particle diameter (mixed with 12 parts by weight of citric acid per 100 parts by weight of a mixed solvent of water / ethanol 1: 2 parts by weight) 55 parts by weight of a sol solution dispersed in dimethylformamide in an amount of 18% by weight of hollow silica (SG-HS40, 40 nm in diameter) was mixed and stirred to prepare a mixed solution. And aged for 20 hours to prepare a coating composition for paper species as shown in Table 1 below for removing and blocking harmful substances.

≪ Examples 2 to 12 >

The coating compositions of the following kind were prepared as shown in Table 1 or Table 2 by changing the composition ratio of the coating composition as shown in Table 1 or Table 2 below.

≪ Comparative Examples 1 and 2 &

The coating compositions were prepared as shown in Table 2 below by changing the composition ratio of the composition as shown in Table 2 below.

<Experimental Example 1>

The coating compositions prepared in the above Examples and Comparative Examples were coated on a white paper (Korean paper, NewClean glossy paper) having an A4 size basis weight of 60 g / m 2 by a gravure coating method, To obtain a paper coated with the composition. The properties of the paper thus prepared were evaluated and shown in Tables 1 and 2.

At this time, in order to evaluate the performance of removing the harmful substances by the coating composition, pesticide solution (benzene solution in which 5% by weight of formaldehyde, 5% by weight of carbon tetrachloride and 5% by weight of polychlorinated biphenyls After thinly coated, it was dried in a sealed chamber at 40 캜.

Further, in order to evaluate whether or not the visibility of the printed characters by the coating composition is deteriorated, the type was printed on paper treated with the pest substance solution using a conventional printer.

1. Assessment of removal of harmful substances

The amount of volatile organic compounds, amount of formaldehyde, amount of carbon tetrachloride, and amount of polychlorinated biphenyl were measured in accordance with the Ministry of Environment Notification No. 201024, which is the indoor air quality process test standard for paper, using the small chamber method. The measured results were expressed as a ratio relative to each amount based on 100% of the evaluation results of the paper before the coating composition treatment.

2. Adhesion Evaluation A

The paper was bent so that two opposing sides of the coated paper were in contact with each other, and then spread out to form paper so that the two sides abutted in opposite directions. The procedure was repeated 500 sets with 1 set, and the surface of the paper was observed with an optical microscope to evaluate whether or not the coating layer cracked. At this time, the results are shown as 5 when no crack occurs, 4 when the length of the crack is less than 1 탆, 3 when the length of the crack is less than 1 탆 or more and less than 3 탆, 3 when the length of the crack is less than 3 탆 or more and less than 5 탆 1 when the length of the crack was 5 탆 or more, and 0 when the crack was present.

3. Adhesion Evaluation B

One hundred sheets of the coated paper were folded in half and the spreading was repeated 100 sets. After that, the folded portion of the paper was observed with an optical microscope to evaluate whether cracks or peeling occurred. At this time, the results are shown as 5 when no crack occurs, 4 when the length of the crack is less than 1 탆, 3 when the length of the crack is less than 1 탆 or more and less than 3 탆, 3 when the length of the crack is less than 3 탆 or more and less than 5 탆 1 when the length of the crack was 5 탆 or more, and 0 when the crack was present.

4. Visibility Evaluation

In order to evaluate the visibility of the printed type on the paper after coating, it is determined whether or not the visibility of the type, such as the type smear, , And the average value was calculated by evaluating to 1 when there is.

"C" in the zeolite in the description of Tables 1 and 2 below means abbreviation for chabazite, "M" stands for mordenite, and "L" stands for clinoptilolite.

Also, TVOC represents the total volume of volatile organic compounds.

Further, "hollow" in silica refers to hollow silica, and "non-hollowed" means spherical silica having the same particle diameter and no hollow portion.

As can be seen in Tables 1 and 2 above,

Compared with Example 1, zeolite-containing Comparative Example 1 showed a slight decrease in the ability to remove toxic substances, and in particular, the total volume of volatile organic compounds (TVOC) It can be expected that it is significantly lowered from the viewpoint of visibility in comparison with the first embodiment. In addition, Comparative Example 2 with clinoptilolite exhibited a similar level of toxic substance removal performance as compared with Example 1, but it was confirmed that visibility was significantly lowered in comparison with Example 1 in terms of visibility.

In addition, it can be confirmed that the adhesiveness was slightly lowered in Example 2 in which the content of the zeolite minerals was exceeded beyond the preferable range, compared with Example 1, and in the case of Example 3 in which the amount was less than the preferable range 1, it can be confirmed that the removal performance of the harmful substances is lowered.

In addition, in Example 4 in which the content of bentonite was less than the preferred range, it was confirmed that the property of removing toxic substances was reduced and the properties of Adhesive Evaluation B were greatly reduced. In addition, in Example 5 in which the content of bentonite exceeded the preferable range, the physical properties in the adhesion B evaluation were reduced as compared with Example 1, and it was confirmed that the coating properties were deteriorated.

On the other hand, in Example 9 having no silica sol, it was confirmed that a remarkable deterioration of physical properties occurred in comparison with Example 1 as a result of the adhesion evaluation.

In addition, in the case of Example 8 in which the hollow silica was not used and silica sol was used, the adhesion evaluation result was good, but the removal ability of harmful substances, in particular, the removal ability of polyvinyl chloride It can be confirmed that it is remarkably decreased.

Also, in the case of Example 6 in which the silica content in the silica sol was small even in the case of using the silica sol having the hollow silica, the property deterioration was greater in the adhesion evaluation B than in Example 1, and the silica content in the silica sol It was confirmed that the adhesiveness was significantly lowered in Example 7 than in Example 1 due to the lowering of the coating property.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (1)

(1) Coating of natural zeolite-based minerals such as chabazite, bentonite, activated carbon, inorganic antibacterial agent, and coated surface To improve adhesion and removal ability of toxic substances, silica sol is mixed with cation water to prepare a mixed solution; And
(2) aging the mixed solution at a temperature of 60 to 65 ° C for at least 24 hours,
The natural zeolitic mineral is dissolved in an acidic solution and then mixed in a neutralized solution state with a large amount of an alkali solution,
The mixed solution is prepared by mixing 35 to 40 parts by weight of chabazite, 10 to 15 parts by weight of bentonite, 5 to 10 parts by weight of activated carbon, 2 to 5 parts by weight of inorganic antibacterial agent, And 50 to 60 parts by weight of silica sol,
Wherein the silica sol contains 15 to 20% by weight of hollow silica and a residual amount of the dispersion solvent, the average particle diameter of the hollow silica is 30 to 50 nm,
Wherein the inorganic antibacterial agent is silver nano colloid containing 10-15 parts by weight of silver citrate relative to 100 parts by weight of a mixed solvent of water and ethanol at a weight ratio of 1: 2, and the chabazite has an average particle size of 50 to 150 μm A method for manufacturing an environmentally friendly coating composition.

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