KR101892993B1 - Inorganic coating composition and its preparing method - Google Patents

Abstract

More particularly, the present invention relates to an inorganic coating composition and an inorganic coating composition which are improved in the performance of adsorbing toluene by using activated carbon having excellent porosity and hydroxyapatite and hydrophilic water glass. A manufacturing method is provided.

Description

[0001] INORGANIC COATING COMPOSITION AND ITS PREPARING METHOD [0002]

The present invention relates to an inorganic coating composition and a method for producing the same. More particularly, the present invention relates to an inorganic coating composition and an inorganic coating composition which improve the performance of adsorbing toluene by using activated carbon excellent in porosity and hydroxyapatite and water- And a method for producing the coating composition.

Toluene, a volatile organic compound, is widely used as a raw material for furniture, wallpaper, paint, urethane rubber material, and automobile material. Therefore, it is an environmentally harmful substance that can be easily accessed in daily life.

Recently, a lot of studies have been conducted to improve indoor air quality, but studies for reducing toluene have been limited. Korean Patent No. 10-0525007 discloses a method for producing silver and charcoal compound adhesives having a sick house syndrome inhibiting function. This technique includes a construction in which a charcoal powder, a silver solution and the like are added to an organic acrylic binder . However, the Korean patent has a problem that the charcoal powder, which is a functional material capable of adsorbing toluene, is wrapped with an acrylic binder, which is a polymer, and thus the pores of the charcoal powder are clogged to deteriorate the functionality.

Korean Patent No. 10-0525007

Accordingly, an object of the present invention is to provide an inorganic coating composition having improved performance of adsorbing toluene by using active carbon having excellent porosity, hydroxyapatite and hydrophilic water glass.

A second object of the present invention is to provide a process for producing the above inorganic coating composition.

However, the problems to be solved by the present invention are not limited to the above-mentioned problems, and other problems not mentioned can be clearly understood by those skilled in the art from the following description.

In order to achieve the object of the present invention, the present invention provides an inorganic coating composition comprising water glass, activated carbon, hydroxyapatite, and a magnesium compound.

The inorganic coating composition may comprise 100 parts by weight of water glass, about 20 to about 200 parts by weight of activated carbon, about 1 to about 10 parts by weight of hydroxyapatite, and about 1 to about 10 parts by weight of magnesium compound .

The water glass has a solid content of about 10% by weight to about 40% by weight and may comprise one or more selected from the group consisting of liquid sodium silicate, liquid potassium silicate, and liquid lithium silicate.

The activated carbon may have a pore size of about 5 A to about 25 A, a specific surface area of about 700 m ² / g to about 1300 m ² / g, and a total pore volume of about 0.3 cc / g to about 1.5 cc / g have.

The magnesium compound may include one or more selected from the group consisting of magnesium carbonate, magnesium sulfate, magnesium boron, light dolomite, dolomite, magnesium oxide, magnesium hydroxide, and magnesium chloride.

The inorganic coating composition may further include one or more selected from the group consisting of an inorganic antibacterial agent, an ethylene vinyl acetate (EVA) copolymer powder, silica sand, elvan, feldspar, talc and a thickener.

The inorganic antibacterial agent may be a zeolite containing metal nanoparticles or a water soluble silver nanoparticle.

According to another aspect of the present invention, there is provided a method for producing a water-based glass comprising the steps of preparing water glass, a step of mixing the water glass with a thickener to prepare a mixture, And a third step of mixing and homogeneously stirring the inorganic coating composition.

The above-described inorganic coating composition of the present invention can improve the performance of adsorbing toluene by containing active carbon having excellent porosity and hydroxyapatite and water glass which is hydrophilic. In addition, the inorganic coating composition according to one embodiment of the present invention may contain a metal (e.g., silver, zinc, or copper) particles contained in zeolite pores to prevent the formation of bacteria or fungi.

The inorganic coating composition according to one embodiment of the present invention can be used as a porcelain wall coating or a paint for indoor wallpaper coating because it is prevented from condensation and is excellent in film adhesion.

Hereinafter, exemplary embodiments of the present invention will be described in detail so as to enable those skilled in the art to easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

It is to be understood that the terms or words used in the specification and claims are not to be construed in a conventional or dictionary sense and that the inventor may properly define the concept of a term in order to best describe its invention And should be construed in accordance with the principles and meanings and concepts consistent with the technical idea of the present invention.

In the specification of the present invention, when a component is referred to as "comprising ", it means that it can include other components as well as other components, .

In the specification of the present invention, "A and / or B" means A or B, or A and B.

The present invention has been specifically described below, but the present invention is not limited thereto.

The present invention provides an inorganic coating composition comprising water glass, activated carbon, hydroxyapatite, and a magnesium compound.

Wherein the inorganic coating composition contains about 20 parts by weight to about 200 parts by weight of activated carbon when about 100 parts by weight of water glass having a solid content of about 10% by weight to about 40% by weight is contained, About 10 parts by weight of the magnesium compound and about 1 part by weight to about 10 parts by weight of the magnesium compound.

The water glass plays a role of a binder and imparts tackiness when the inorganic coating composition is applied to the surface of a work, and improves mechanical strength and homogeneous bonding properties. The water glass may include, for example, one or more selected from the group consisting of liquid sodium silicate, liquid potassium silicate, and liquid lithium silicate. The water glass is preferably a mixture of about 90 parts by weight to about 99 parts by weight of potassium silicate and about 1 part by weight to about 10 parts by weight of lithium silicate, but may not be limited thereto. If the solid content of the water glass exceeds 40 wt%, cracks may occur in the coating film, and if the solid content is less than 10 wt%, the strength of the coating film may be weakened.

The inorganic coating composition may contain about 20 parts by weight to about 200 parts by weight of activated carbon. When it is contained in an amount exceeding 200 parts by weight, the film strength may be lowered. When the amount is less than 20 parts by weight, the toluene adsorption function is deteriorated.

In the present invention, the particle size of the activated carbon is preferably from about 10 nm to about 500 nm, more preferably from about 80 nm to about 200 nm on average, but may not be limited thereto. When the particle size exceeds 500 nm, the surface of the coating film may be roughened. When the particle size is less than 10 nm, cracks may occur in the coating film.

In the present invention, the activated carbon preferably has a pore size of about 5 Å to about 25 Å, more preferably about 14 Å to 18 Å, but may not be limited thereto. The activated carbon preferably has a specific surface area of about 700 m ² / g to about 1300 m ² / g, more preferably about 1000 m ² / g to about 1300 m ² / g, but may not be limited thereto . The activated carbon used in the present invention has a large specific surface area due to a large number of pores, so that a large amount of toluene can be adsorbed. The total pore volume of the activated carbon is preferably from about 0.3 cc / g to about 1.5 cc / g as a factor that can explain the capacity of adsorbing toluene, but may not be limited thereto.

The inorganic coating composition may contain about 1 part by weight to about 10 parts by weight of hydroxyapatite. If it exceeds 10 parts by weight, the film strength can be weakened If it is contained in an amount of less than 1 part by weight, the toluene adsorption function is deteriorated.

The hydroxyapatite is a porous bioceramic material having pores to adsorb toluene and remove heavy metal ions, and has a role of improving flowability in an inorganic coating composition. The hydroxyapatite is a non-toxic, biocompatible inorganic material.

The inorganic coating composition may contain about 1 part by weight to about 10 parts by weight of a magnesium compound. If the amount of the inorganic binder is more than 10 parts by weight, cracking of the coating film may be accelerated due to rapid initial curing. If the amount of the inorganic binder is less than 1 part by weight, the inorganic binder may melt into water when exposed to water after the inorganic coating composition is coated. Can be.

The magnesium compound serves as a curing agent. When the magnesium compound is contained in the inorganic coating composition, the inorganic binder and the magnesium compound react with each other to cure the inorganic binder, so that it is not soluble in water after drying.

The inorganic coating composition according to one embodiment of the present invention comprises about 0.5 to about 30 parts by weight of an inorganic antibacterial agent, about 0.5 to about 10 parts by weight of an EVA copolymer powder and about 0.5 to about 20 parts by weight of a thickener (0.01 To 5% by weight aqueous solution).

The inorganic antibacterial agent may be used to impart antimicrobial and antifungal activity to the coating film. The inorganic antibacterial agent may be a metal having one or more metals selected from the group consisting of silver, copper and zinc in the interior of the pores of the zeolite , Or water soluble silver nanoparticles.

In general, silver is known to have antibacterial performance, but it has a property of being discolored by light and is not suitable to be actually applied to paints. In the present invention, zeolite in which silver or copper or zinc nanoparticles are inserted into pores is used as an inorganic antimicrobial agent. Since silver or copper or zinc, which is liable to be discolored by light, is present inside the zeolite, It is possible to prevent discoloration of the coating film. When the inorganic antibacterial agent is contained in the inorganic coating composition in an amount exceeding 30 parts by weight, the material cost may be increased. When the inorganic antibacterial agent is contained in an amount less than 0.5 parts by weight, antibacterial and antifungal performance may be deteriorated. In addition, when silver, copper or zinc nanoparticles are present in the pores of the zeolite, microorganisms and / or fungi are inserted into the pores and can not be inhabited.

The EVA copolymer powder may be used for imparting flexibility to the coating film. When the EVA copolymer is contained in an amount exceeding 10 parts by weight, the pores of the activated carbon and / or hydroxyapatite may be blocked to lower the toluene adsorption performance. When the EVA copolymer is contained in an amount less than 0.5 parts by weight, May not be implemented.

The thickener is used for controlling the viscosity of the inorganic coating composition and may be used in the form of an aqueous solution of a thickener in an amount of 0.01 to 5 wt%. Examples of the thickener include methyl cellulose (MC), sodium carboxymethyl cellulose, hydroxymethyl cellulose, natrazole, hydroxyethyl cellulose, hydroxypropyl cellulose, hydroxypropylmethyl cellulose, arabic gum, sodium polyacrylate And polyacrylamides. The term " polyacrylamide " The inorganic coating composition may contain about 0.5 to about 20 parts by weight of an aqueous solution of a thickening agent in an amount of 0.01 to 5% by weight. When the content of the thickening agent is less than 0.5 parts by weight, precipitation of the inorganic powder occurs, The coating film may not be uniformly formed when it is not adhered to the coating film, and if it is contained in an amount exceeding 20 parts by weight, the coating film may be cracked or lifted.

Also, the inorganic coating composition according to one embodiment of the present invention may contain about 10 parts by weight to about 100 parts by weight of silicon dioxide powder, about 1 part by weight to about 100 parts by weight of elvan powder, about 10 parts by weight to about 50 parts by weight of diatomaceous earth powder , From about 1 part by weight to about 50 parts by weight feldspar powder, and from about 0.1 part by weight to about 5 parts by weight of talc.

The silicon dioxide powder, elvan powder, diatomaceous earth powder, feldspar powder or talc may be used to reinforce the strength of the coating, and their particle size is preferably from about 200 mesh to about 500 mesh, and preferably from about 300 mesh to about 500 More preferably, the mesh is not limited thereto. If the particle size is larger than 200 mesh, the surface of the coating film becomes too rough.

The inorganic coating composition according to one embodiment of the present invention may further comprise a pigment. The pigments may be used to impart color, and may include one or more selected from the group consisting of, for example, loess, gold stones, volcanic ash, and mica.

In addition, the present invention provides a method for producing a water-based coloring composition, comprising the steps of: preparing a water glass; a second step of mixing the water glass with a thickening agent to prepare a mixture; and a third step of mixing and stirring the activated carbon, hydroxyapatite, Wherein the inorganic coating composition is an inorganic coating composition.

The third step may further include mixing one or more selected from the group consisting of an inorganic antibacterial agent, an EVA copolymer powder, silica sand, elvan stone, feldspar, and talc. The mixture is mixed with activated carbon, hydroxyapatite and magnesium compound, and at the same time or sequentially, one or more selected from the group consisting of inorganic antibacterial agent, EVA copolymer powder, silica sand, elvan stone, feldspar and talc are added and mixed . The inorganic coating composition prepared by further containing at least one selected from the group consisting of an inorganic antibacterial agent, EVA copolymer powder, silica sand, elvan stone, feldspar, and talc further increases antimicrobial activity, antifungal property, flexibility and strength of the coating film .

Hereinafter, the present invention will be described in more detail with reference to Examples. However, the following Examples are given for the purpose of helping understanding of the present invention, but the present invention is not limited to the following Examples.

≪ Preparation of Examples and Comparative Examples >

Example

Each raw material was mixed to have a weight ratio shown in Table 1 below to prepare an inorganic coating composition.

<Process>

Step 1: Preparation of water glass

95 g of 27% by weight aqueous potassium silicate solution and 5 g of 27% by weight lithium silicate aqueous solution were mixed in a reaction tank and homogeneously stirred to prepare an inorganic liquid binder (water glass).

Step 2: Preparation of the mixture

The MC aqueous solution dissolved in 1 wt% was added to the inorganic liquid binder, and homogeneously stirred for 30 minutes to prepare a mixture.

Step 3: Preparation of inorganic coating composition

To this mixture, activated carbon, hydroxyapatite, silicon dioxide powder, EVA powder, talc, silver-containing zeolite (inorganic antibacterial agent) and magnesium hydroxide were mixed and homogeneously stirred to prepare an inorganic coating composition.

Comparative Example

The respective raw materials were mixed so as to have the weight ratios shown in Table 2 below to prepare comparative coating compositions. In the comparative example, a water-soluble acrylic binder was used instead of the inorganic liquid binder and zeolite (mixture of 4A type and X type in a ratio of 1: 1 (w / w)) was used instead of hydroxyapatite, Containing zeolite was used instead of zeolite, and the other process was the same as that of Example 1.

<Preparation of silver ion solution>

300 g of pulverized silver was placed in a heating furnace, and 50 ml of 0.1 N nitric acid was slowly added thereto while heating to prepare a silver solution.

Separately, 100 g of ferrous chloride was added to 100 ml of 0.1 N hydrochloric acid to dissolve the solution, which was then mixed with the silver solution to prepare a silver solution.

150 g of zinc oxide was added to 500 ml of a 0.1 N caustic soda solution to dissolve the solution to prepare a solution. The solution was mixed with a solution of the above-prepared solution to give a pH of 7.5, followed by drying by heating to completely evaporate the water, Powder was prepared.

Powdered silver powder was prepared by adding 100 g of 300 mesh silica gel powder to 300 g of the prepared powder powder. 300 g of the silver powder was dissolved in 1000 ml of water to prepare a silver solution as an inorganic antibacterial agent. To the silver solution, 4 ml was added and the hydrogen peroxide was again evaporated while stirring for about 30 minutes.

The silver solution in which the hydrogen peroxide was evaporated was filled in a clear glass bottle, left for about one hour in daylight, and the precipitate that precipitated down was removed by filtration to prepare a silver ion solution.

EXPERIMENTAL EXAMPLE 1 Evaluation of Reduction Function of Hazardous Substances

The inorganic coating compositions prepared in Examples and Comparative Examples were colored and dried to the same thickness on a glass plate having a size of 160 x 160 mm and dried to prepare a test piece having a surface area of 0.0256 m ² . Experiments were carried out in which the test pieces of Examples and Comparative Examples were placed in a 20 L capacity adsorption chamber and the adsorption performance of toluene was compared according to the test conditions of Table 3 according to the ISO 16000-24: 2009 test method. The results of comparative tests of Examples and Comparative Examples are shown in Table 4.

As shown in Table 4, it was confirmed that the inorganic coating compositions prepared in Examples 1 to 3 were significantly superior in toluene adsorption performance to the composition prepared in Comparative Example 1.

In addition, the specific toluene adsorption function test results of Example 1 are shown in Tables 5 to 7 below.

As shown in Tables 5 to 7, in the case of the inorganic coating composition prepared in Example 1, the adsorption rate slightly decreased with time, but the adsorption amount increased significantly after 1 day, and the final adsorption rate after 7 days 98.9%. This is far superior to the adsorption rate of Comparative Example 1.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the present invention. You will understand. It is therefore to be understood that the embodiments described above are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

Claims (5)

An inorganic coating composition comprising water glass, activated carbon, hydroxyapatite, and a magnesium compound,
Wherein the inorganic coating composition comprises 100 parts by weight of water glass, 20 to 200 parts by weight of activated carbon, 1 to 10 parts by weight of hydroxyapatite, and 1 to 10 parts by weight of a magnesium compound,
Characterized in that the activated carbon has a pore size of 5 to 25 A, a specific surface area of 700 to 1300 m &lt; ² &gt; / g and a total pore volume of 0.3 to 1.5 cc / g,
Wherein the magnesium compound includes at least one selected from the group consisting of magnesium carbonate, magnesium sulfate, magnesium boron, light dolomite, dolomite, magnesium oxide, magnesium hydroxide, and magnesium chloride.
The method according to claim 1,
Wherein the water glass has a solid content of 10 to 40% by weight and contains one or more selected from the group consisting of liquid sodium silicate, liquid potassium silicate, and liquid lithium silicate.
The method according to claim 1,
Wherein the inorganic coating composition further comprises one or more selected from the group consisting of an inorganic antibacterial agent, an ethylene vinyl acetate copolymer powder, silica sand, elvan stone, feldspar, talc and a thickener.
The method of claim 3,
Wherein the inorganic antibacterial agent is a zeolite containing metal nanoparticles or a water soluble silver nanoparticle.
A process for producing the inorganic coating composition according to claim 1,
A first step of preparing water glass;
A second step of mixing the water glass with a thickener to prepare a mixture; And
And a third step in which the mixture is mixed with active carbon, hydroxyapatite and magnesium compound and stirred homogeneously.