WO2019216598A1

WO2019216598A1 - Water soluble coating material and coating method thereof

Info

Publication number: WO2019216598A1
Application number: PCT/KR2019/005267
Authority: WO
Inventors: 김지현; 홍상현; 이서진
Original assignee: 엘지전자 주식회사
Priority date: 2018-05-08
Filing date: 2019-05-02
Publication date: 2019-11-14

Abstract

The present invention relates to a water soluble coating material comprising: a solubilizer containing an acrylic polymer or a glycol-based polymer; and molybdenum-containing inorganic particles, wherein the content of the inorganic particles is in the range of 7.5 to 50 parts by weight per 100 parts by weight of the polymer contained in the solubilizer.

Description

Water soluble coating material and coating method thereof

The present invention relates to a water-soluble coating material and a coating method thereof, and more particularly, to a water-soluble coating material and a coating method formed to prevent the generation of odor-causing substances.

Microorganisms such as bacteria and fungi exist throughout life. In particular, the growth of bacteria and fungi may occur actively on surfaces exposed to moist environment. As a result, bacteria and fungi multiply on the surface to produce substances that cause an unpleasant odor.

To solve this problem, the moisture can be removed immediately to prevent the growth of bacteria and fungi. However, creating a dehumidified environment can be difficult. For example, it may be difficult to remove moisture such as condensate formed on the surface of the heat exchanger generated by the operation of the heat exchanger, which is a core component of an air conditioner, a refrigerator and a clothes dryer. In addition, there are also surfaces that are difficult to avoid, such as washing machines that are constantly exposed to moisture.

Thus, in order to remove the unpleasant odor generated by bacteria and mold, a masking technique is used to hide unpleasant odors by mixing aromatic substances. However, mixing different scents requires continuous input of fragrant substances, and the emotions that individuals feel about fragrant substances are subjective, so the effects that can be obtained through masking techniques are limited. In addition, the masking technique has a disadvantage in that it is not possible to remove an unpleasant odor fundamentally.

Therefore, applying a coating containing a transition metal oxide to the base material can impart antimicrobial and catalytic properties to the base material. Since the transition metal oxide meets moisture in the air and quickly changes the surface of the base material to acid, it has an antibacterial property that inhibits the growth of bacteria and destroys the bacteria. Transition metal oxides also have the catalytic properties of adsorbing and oxidizing some malodorous substances into odorless compounds.

When the base metal oxide is used to provide antimicrobial and catalytic properties to the base material, the transition metal oxide should be in the form of particles having a relatively large surface area in order to maintain material properties such as polymers forming the coating layer without losing them. For example, microparticles ranging from several micrometers to several hundred nanometers in size.

As an example of the transition metal oxide in European Patent Publication No. 3,082,415 A1 (October 26, 2016), a composite material formed of a molybdenum-containing inorganic compound was applied to the surface of a product to inhibit the growth of bacteria and fungi. That is, the antimicrobial effect of the composite material formed of the molybdenum-containing inorganic compound has prevented the formation of an unpleasant odor of bacteria and fungi.

However, since the water solubility of the molybdenum-containing inorganic compound is very low as disclosed in the prior literature, there was a limit to coating the water-soluble coating containing the inorganic compound. That is, the molybdenum-containing inorganic compound having a conventional antimicrobial was present in the form of a suspension or dispersion which is dispersed in a water-soluble coating material. Thus, the coating material containing the inorganic compound has a problem that precipitation occurs over time. Thus, the present invention provides a water-soluble coating material containing the inorganic compound and uniformly disperses the inorganic compound over time and a coating method thereof.

It is to propose a water-soluble coating material capable of forming a coating layer having antibacterial or antifungal properties of the present invention.

Another object of the present invention is to propose a water-soluble coating material in which an inorganic compound is uniformly dispersed.

In addition, the present invention is to propose a coating method of a water-soluble coating material.

In addition, the present invention is to propose a coating layer formed by a water-soluble coating material and a coating method.

The water-soluble coating material capable of forming a coating layer having antimicrobial or anti-mildew properties of the present invention may be disclosed as a water-soluble coating material having improved compatibility of molybdenum-containing inorganic particles, including a dissolving agent containing an acrylic polymer or a glycol polymer. .

In detail, the molybdenum-containing inorganic particles included in the water-soluble coating material of the present invention may react with moisture. By the reaction, an acidic substance or active oxygen can be formed. Thus, the water-soluble coating material can reduce the odor resulting from bacteria or mold, and can form a coating layer having antibacterial or anti-fungal properties.

The water-soluble coating material according to the present invention is a solvent containing an acrylic polymer or a glycol polymer; And molybdenum-containing inorganic particles, and the content of the inorganic particles may range from 7.5 to 50 parts by weight per 100 parts by weight of the polymer included in the solubilizer. The inorganic particles may be a material having antibacterial or antifungal properties.

In an embodiment, the inorganic particles may include zinc molybdate (ZnMoO ₄ ) or molybdenum trioxide (MoO ₃ ).

In an embodiment, the water-soluble coating may further include water.

In one embodiment, the water-soluble coating material may further include a hydrophilic film-forming liquid.

In an embodiment, the hydrophilic film-forming liquid comprises a hydrophilic polymer, the hydrophilic polymer is polyvinyl alcohol, polyoxyethylene glycol, polysulfonic acid, polyacrylic acid ), Polymethacrylic acid, polypropylene glycol may include at least one selected from the group consisting of.

In addition, the present invention relates to a coating method, comprising: dissolving a dissolving agent comprising an acrylic polymer or a glycol polymer in water to form a first solution; Mixing molybdenum-containing inorganic particles with the first solution and stirring to form a second solution in which the inorganic particles are dissolved; Mixing a hydrophilic film-forming solution with the second solution to form a third solution; And applying the third solution to a base material and drying at a predetermined temperature to form a coating layer. In the step of forming the coating layer, the inorganic particles are precipitated.

In an embodiment, the content of the polymer contained in the first solution in the step of forming the first solution may be in the range of 4 to 12 parts by weight per 100 parts by weight of water.

In an embodiment, the content of the inorganic particles in the step of forming the second solution may be in the range of 7.5 to 50 parts by weight per 100 parts by weight of the polymer contained in the first solution.

In an embodiment, the inorganic particles of the step of forming the second solution may include zinc molybdate (ZnMoO ₄ ) or molybdenum trioxide (MoO ₃ ).

In an embodiment, in the forming of the third solution, the hydrophilic film-forming solution includes a hydrophilic polymer, and the hydrophilic polymer is polyvinyl alcohol, polyoxyethylene glycol, polysulfonic acid ( It may include at least one selected from the group consisting of polysulfonic acid, polyacrylic acid, polymethacrylic acid, polypropylene glycol.

In an embodiment, the forming of the coating layer may further include forming a hydrophilic layer having a hydrophilic functional group on the surface of the base material, wherein the third solution may be applied to the base material on the hydrophilic layer.

In an embodiment, the predetermined temperature in the step of forming the coating layer may be in the range of 100 to 230 ℃.

In an embodiment, the forming of the coating layer may be performed for a predetermined time, and the predetermined time may range from 5 to 10 minutes.

In addition, the present invention relates to a coating layer may be a coating layer containing molybdenum-containing inorganic particles prepared by the above coating method.

According to the water-soluble coating material according to the present invention, the coating layer formed of a water-soluble coating material comprises molybdenum-containing inorganic particles, the moisture is supplied to the inorganic particles to form an acidic substance or active oxygen. This reduces the odor and has the effect of forming a coating layer having antibacterial or antifungal properties.

In addition, the water-soluble coating material according to the present invention includes molybdenum-containing inorganic particles and a dissolving agent comprising the acrylic polymer or glycol-based polymer is improved miscibility evenly distributed over time to improve long-term storage stability Can be.

In addition, by mixing the water-soluble coating material and water according to the invention applied to the base material on which the coating layer is to be formed, and dried at a predetermined temperature to form a coating layer containing molybdenum-containing inorganic particles, a separate low-temperature cooling is excluded, a simple method It is possible to form a coating layer.

In addition, the coating layer formed by the coating method of the present invention has the effect that the molybdenum-containing inorganic particles are formed on the surface to improve the drainage of the coating layer.

1 is a view showing a procedure of a coating method for forming a coating layer with a water-soluble coating material of the present invention.

2 and 3 are images for comparing the dispersion stability characteristics of the Examples and Comparative Examples of the present invention.

Figure 4 is a view showing a water-soluble coating material of the present invention and a coating layer prepared by the coating method thereof.

5 is an electron microscope image of a water-soluble coating material of the present invention and a coating layer prepared by the coating method thereof.

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings, and the same or similar components are denoted by the same reference numerals regardless of the reference numerals, and redundant description thereof will be omitted. In addition, in describing the embodiments disclosed herein, when it is determined that the detailed description of the related known technology may obscure the gist of the embodiments disclosed herein, the detailed description thereof will be omitted. In addition, the accompanying drawings are intended to facilitate understanding of the embodiments disclosed herein, but are not limited to the technical spirit disclosed herein by the accompanying drawings, all changes included in the spirit and scope of the present invention. It should be understood to include equivalents and substitutes.

Terms including ordinal numbers such as first and second may be used to describe various components, but the components are not limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

Singular expressions include plural expressions unless the context clearly indicates otherwise.

In this application, the terms "comprises" or "having" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

The present invention relates to a water-soluble coating formed to prevent the generation of odor causing substances.

In one embodiment of the present invention, the water-soluble coating material may include a dissolving agent comprising an acrylic polymer or a glycol-based polymer. In addition, the water-soluble coating material may include molybdenum-containing inorganic particles.

The solubilizer may be mixed with the inorganic particles to improve miscibility in an aqueous solution. That is, the inorganic particles may form a uniform liquid phase in the aqueous solution by the acrylic polymer or the glycol polymer of the solubilizer.

In addition, the inorganic particles may be particles containing zinc molybdate (ZnMoO ₄ ) or molybdenum trioxide (MoO ₃ ). The inorganic particles react with water to form active oxygen to reduce odor and exhibit antibacterial or antifungal properties. Thus, the inorganic particles may inhibit the generation of bacteria and mold in the environment rich in moisture to suppress the generation of odor-causing substances such as nitrogen compounds produced by the metabolism of bacteria and mold.

In one embodiment, the content of the inorganic particles may range from 7.5 to 50 parts by weight per 100 parts by weight of the polymer contained in the solubilizer. In detail, when the content of the inorganic particles is less than 7.5 parts by weight per 100 parts by weight of the polymer contained in the solubilizer, sufficient antibacterial or antifungal properties may be sufficiently expressed in the coating layer formed by the coating material due to the low concentration of the inorganic particles. Can't.

On the other hand, when it exceeds 50 parts by weight per 100 parts by weight of the polymer contained in the dissolving agent may be incompatible with the inorganic particles in the water-soluble coating material containing the inorganic particles. Thus, the inorganic particles are incompletely mixed with each other and may phase separate and form precipitates over time.

In one embodiment, when the inorganic particles include zinc molybdate (ZnMoO ₄ ), the solubilizer may be used Synthro® PON W 578 (SYNTHRON Co., Ltd.), a solubilizer containing an acrylic polymer. Thus, inorganic particles containing zinc molybdate (ZnMoO ₄ ) may exhibit sufficient miscibility in aqueous solution.

In one embodiment, in the case of including molybdenum trioxide (MoO ₃ ) in the inorganic particles of the water-soluble coating material, the solubilizer may include polyethylene glycol in the glycol-based polymer. Thus, inorganic particles containing molybdenum trioxide (MoO ₃ ) may exhibit sufficient miscibility in aqueous solution.

In addition, the water-soluble coating material of the present invention may further be formed in a concentration suitable for forming a coating layer further comprises water. In addition, the water-soluble coating material may further include a commercially available hydrophilic film-forming solution. The hydrophilic film-forming liquid contains a hydrophilic polymer. Specifically, the hydrophilic polymer is polyvinyl alcohol, polyoxyethylene glycol, polysulfonic acid, polyacrylic acid, polymethacrylic acid, polypropylene glycol ( polypropylene glycol) may include at least one selected from the group consisting of:

Therefore, when the inorganic particles are formed together with a hydrophilic polymer on the base material by adding a hydrophilic film-forming liquid to the water-soluble coating material of the present invention, water bound to the hydrophilic polymer may be supplied to the inorganic particles. That is, the inorganic particles may react with water supplied by the hydrophilic polymer to form active oxygen to decompose malodorous substances, thereby reducing malodor. In addition, the antimicrobial or antifungal properties of the coating layer made of the water-soluble coating material may be further improved by the reaction.

Referring to FIG. 1, the coating method disclosed in the present invention includes forming a first solution (S100), forming a second solution (S200), forming a third solution (S300), and forming a coating layer. It may include the step (S400).

In detail, in the step of forming the first solution (S100), a dissolving agent containing an acrylic polymer or a glycol polymer in water is dissolved to form a first solution. The content of the polymer contained in the first solution may include a content capable of sufficiently mixing the molybdenum-containing inorganic particles to be described later.

Thus, preferably the content of the polymer contained in the first solution may be formed in the range of 4 to 12 parts by weight per 100 parts by weight of water. When the content of the polymer is less than 4 parts by weight per 100 parts by weight of water, the inorganic particles described below may not be sufficiently mixed in the aqueous solution. In addition, when the content of the polymer exceeds 12 parts by weight per 100 parts by weight of water may cause a problem in forming a coating layer to be described later. In detail, when the content of the polymer increases, the concentration of the hydrophilic polymer contained in the hydrophilic film-forming solution included in the third solution described later and constituting the main component of the coating layer is lowered, so that the surface of the base material contains the hydrophilic polymer. Even coating layers cannot be formed.

In the step (S200) of forming the second solution, the molybdenum-containing inorganic particles are mixed with the first solution and stirred to form a second solution. The content of the inorganic particles may be formed in the range of 7.5 to 50 parts by weight per 100 parts by weight of the polymer contained in the first solution. When the content of the inorganic particles is less than 7.5, the sufficient antimicrobial or antifungal properties may not be sufficiently expressed in the coating layer formed by the coating material due to the low inorganic particle concentration. On the other hand, when more than 50 parts by weight per 100 parts by weight of the polymer contained in the solubilizer may be incompatible with the inorganic particles in the second solution containing the inorganic particles. Thus, the inorganic particles are incompletely mixed with each other and may phase separate and form precipitates over time.

In one embodiment, the inorganic particles in the step of forming the second solution may include zinc molybdate (ZnMoO ₄ ) or molybdenum trioxide (MoO ₃ ).

In one embodiment, when the inorganic particles include zinc molybdate (ZnMoO ₄ ), the above-mentioned dissolving agent may be used Synthro® PON W 578 (SYNTHRON Co., Ltd.), a dissolving agent containing an acrylic polymer. Thus, inorganic particles containing zinc molybdate (ZnMoO ₄ ) may exhibit sufficient miscibility in aqueous solution.

In one embodiment, in the case of including molybdenum trioxide (MoO ₃ ) in the inorganic particles of the water-soluble coating material, the above-described dissolving agent may include polyethylene glycol in the glycol-based polymer. Thus, inorganic particles containing molybdenum trioxide (MoO ₃ ) may exhibit sufficient miscibility in aqueous solution.

In the forming of the third solution (S300), the third solution is formed by mixing the hydrophilic film-forming solution with the second solution. The hydrophilic film-forming liquid may be a film-forming liquid to form a film of a commercial hydrophilic polymer. In detail, the hydrophilic film-forming liquid may include a hydrophilic polymer, and the hydrophilic polymer may include polyvinyl alcohol, polyoxyethylene glycol, polysulfonic acid, polyacrylic acid, and polymethacryl. It may include at least one selected from the group consisting of polymethacrylic acid, polypropylene glycol.

In the forming of the coating layer (S400), the third solution may be applied to the surface of the base material on which the coating layer is to be formed, and dried to form a coating layer at a predetermined temperature, thereby forming a coating layer including inorganic particles. In the process of drying at a predetermined temperature, the inorganic particles may be precipitated and formed on the coating layer. The process of applying the third solution is a method of applying a liquid to the surface of the base material such as dip coating, spin coating, roll coating, and spray coating. It is not limited to.

On the other hand, the predetermined temperature may be in the range of 100 to 230 ℃. When the predetermined temperature is less than 100 ℃ may take a long time to form a coating layer, the inorganic particles may not be precipitated in a crystal of a suitable size for the coating layer. In addition, when the predetermined temperature exceeds 230 ℃, the acrylic polymer, glycol-based polymer and the water-soluble polymer is deteriorated due to deterioration can not form a coating layer.

In addition, a suitable time for forming the coating layer in the predetermined temperature range may be preferably in the range of 5 to 10 minutes. Forming the coating layer (S400) is dried at the predetermined temperature to form a coating layer containing the molybdenum-containing inorganic particles is excluded from the low temperature cooling, it is possible to form a coating layer in a simple manner.

In addition, the forming of the coating layer (S400) may further include forming a hydrophilic layer having a hydrophilic functional group on the surface of the base material. In one embodiment, the hydrophilic layer may be formed of aluminum oxide by oxidizing or etching the surface of the base material formed of aluminum. In addition, the hydrophilic layer may be formed by applying a polymer having hydrophilicity.

For example, the hydrophilic layer can include a hydrophilic functional group, such as a hydroxyl group (-OH), on the surface. Thus, the adhesion of the hydrophilic functional group of the hydrophilic layer and the hydrophilic polymer included in the coating layer of the present invention can be improved. In addition, the hydrophilic layer may be formed by an etching process. Hydrophilicity having a specific shape may be formed on the surface of the base material by the etching process. Thus, the surface area is increased to the specific shape, thereby improving the adhesion between the hydrophilic layer and the coating layer of the present invention.

Hereinafter, the Example of the water-soluble coating material of this invention is described.

Example: Formation of Water-Soluble Coating Material

The water-soluble coating material is according to the above description, and in detail, forming the first solution (S100), forming the second solution (S200) and forming the third solution of the coating method of the water-soluble coating material described in FIG. It may be manufactured according to the step (S300). In detail, the water-soluble coating material of an Example contains an inorganic particle, a dissolving agent, and a hydrophilic film formation liquid. In addition, zinc molybdate (ZnMoO ₄ ) is included as an inorganic particle, and a dissolving agent includes Synthro® PON W 578 (SYNTHRON Co., Ltd.), a dissolving agent containing an acrylic polymer.

Comparative Example 1

The coating material of Comparative Example 1 is a solution containing inorganic particles in the hydrophilic film-forming solution. In detail, the solution of Comparative Example 1 was prepared in the same manner as in Example described above, excluding the solvent, compared to the water-soluble coating material of the Example.

Comparative Example 2

The coating material of Comparative Example 2 is a hydrophilic film-forming liquid, excluding a solvent and inorganic particles in the water-soluble coating material of the embodiment.

Referring to FIG. 2, dispersion stability was measured using Turbiscan® LAB (Formulaction Co., France). In detail, the graph of Figure 2 shows the dispersion stability of the coating material of Example, Comparative Example 1, Comparative Example 2 as shown respectively. In the case of the embodiment it can be seen that the dispersion remains stable while having a high transmittance regardless of the passage of time.

On the other hand, in Comparative Example 1 it was found that the dispersion state of the inorganic particles could not be maintained and precipitates formed immediately. In addition, in Comparative Example 2, there was a fluctuation in the result value indicating dispersion stability, but no change was observed such as precipitation of the particles being formed.

That is, it can be seen that the change in dispersion stability caused by precipitation of Comparative Example 1 originates from inorganic particles. It can also be seen that the miscibility of the inorganic particles is improved by including a dissolving agent.

That is, the embodiment includes the molybdenum-containing inorganic particles and the dissolving agent including the acrylic polymer or the glycol polymer to improve miscibility and uniformly disperse over time, thereby improving long-term storage stability.

Referring to FIG. 3, the water-soluble coating materials of Examples and Comparative Examples 1 are visually observed. In detail, (a) of FIG. 3 is an Example, and (b) shows the state of the comparative example 1. FIG. In Figure 3 it can be seen that the coating material of the embodiment similar to the dispersion stability results of Figure 2 because the inorganic particles have sufficient miscibility, evenly formed without precipitation in a transparent solution. On the other hand, it can be seen that the coating material of Comparative Example 1 is incompatible with the inorganic particles and thus opaquely formed as a suspension.

4 is a view showing a coating layer 100 prepared by the water-soluble coating material and the coating method of the present invention.

Referring to FIG. 4, the coating layer 100 of the present invention may exist in a form laminated on the surface of the base material 20. The base material 20 may be various products formed by injection molding.

The coating layer 100 may include the hydrophilic polymer layer 10 and the inorganic particles 11 distributed or dispersed in the hydrophilic polymer layer 10. The inorganic particles 11 are precipitated in the hydrophilic polymer layer 10 and exist in the form of a filler or a filler, and may be located anywhere in the interior and the surface of the hydrophilic polymer layer 10.

In addition, the precipitated inorganic particles 11 need to be maintained without losing material properties such as hydrophilic polymers while giving antimicrobial, antifungal and catalytic properties to the base material. Therefore, the average particles of the inorganic particles 11 may be formed of particles of several hundred nanometers in size to be stably present in the coating layer 100 to be evenly dispersed.

Therefore, since the inorganic particles 11 are in the form of particles having a relatively large surface area, they meet with moisture in the air to quickly change the surface of the coating layer 100 to acidic acid, or generate free radicals to inhibit or destroy the growth of bacteria or fungi. It is easy to have antibacterial and antifungal properties. That is, since the coating layer 100 has antibacterial and antifungal properties, it is possible to prevent the production of a substance causing an unpleasant odor while breeding bacteria and mold.

Furthermore, the average particle of the precipitated inorganic particles 11 is formed of particles of several hundred nanometers in size so that appropriate moisture may be attached to the surface of the coating layer 100. Thus, drainage of the coating layer 100 may be improved.

In addition, as described above in the description of FIG. 1, the method may further include forming a hydrophilic layer (not shown) having a hydrophilic functional group on the surface of the base material 20 in forming the coating layer (S400). ) May be further laminated with a hydrophilic layer.

Referring to Figure 5, it can be seen that the inorganic particles appearing to be evenly dispersed in the coating layer is formed.

It will be apparent to those skilled in the art that the water-soluble coating material and the coating method described above are not limited to the configuration and method of the embodiments described above, but may be embodied in other specific forms without departing from the essential features of the present invention.

In addition, the above detailed description should not be interpreted as limiting in all aspects and should be considered as illustrative. The scope of the invention should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of the invention are included in the scope of the invention.

Claims

Solvents containing an acrylic polymer or a glycol polymer; And

Molybdenum-containing inorganic particles,

The content of the inorganic particles is a water-soluble coating material, characterized in that in the range of 7.5 to 50 parts by weight per 100 parts by weight of the polymer contained in the solvent.
The method of claim 1,

The inorganic particles are zinc molybdate (zinc molybdate, ZnMoO 4 ) or molybdenum trioxide (molybdenum trioxide, MoO 3 ) water-soluble coating material characterized in that it comprises.
The method of claim 1,

The water-soluble coating material is a water-soluble coating material, characterized in that it further comprises water.
The method of claim 1,

The water-soluble coating material is a water-soluble coating material, characterized in that it further comprises a hydrophilic film-forming liquid.
The method of claim 4, wherein

The hydrophilic film-forming liquid contains a hydrophilic polymer,

The hydrophilic polymer is polyvinyl alcohol, polyoxyethylene glycol, polysulfonic acid, polyacrylic acid, polymethacrylic acid, polypropylene glycol Water-soluble coating material, characterized in that it comprises at least one selected from the group consisting of.
Dissolving a dissolving agent comprising an acrylic polymer or a glycol polymer in water to form a first solution;

Mixing molybdenum-containing inorganic particles with the first solution and stirring to form a second solution in which the inorganic particles are dissolved;

Mixing a hydrophilic film-forming solution with the second solution to form a third solution; And

Applying the third solution to a base material and drying at a predetermined temperature to form a coating layer,

Coating method characterized in that the inorganic particles are precipitated in the step of forming the coating layer.
The method of claim 6,

The content of the polymer contained in the first solution in the step of forming the first solution is a coating method, characterized in that the range of 4 to 12 parts by weight per 100 parts by weight of water.
The method of claim 6,

The content of the inorganic particles in the step of forming the second solution is a coating method, characterized in that the range of 7.5 to 50 parts by weight per 100 parts by weight of the polymer contained in the first solution.
The method of claim 9,

The inorganic particles in the step of forming the second solution is a coating method comprising zinc molybdate (Zinc molybdate, ZnMoO 4 ) or molybdenum trioxide (MoO 3 ).
The method of claim 6,

In the step of forming the third solution, the hydrophilic film-forming solution comprises a hydrophilic polymer,

The hydrophilic polymer is polyvinyl alcohol, polyoxyethylene glycol, polysulfonic acid, polyacrylic acid, polymethacrylic acid, polypropylene glycol Coating method comprising at least one selected from the group consisting of).
The method of claim 6,

Forming a hydrophilic layer having a hydrophilic functional group on the surface of the base material in the step of forming the coating layer,

Coating method characterized in that the third solution is applied to the base material on the hydrophilic layer.
The method of claim 6,

The coating method in the step of forming the coating layer, characterized in that the predetermined temperature ranges from 100 to 230 ℃.
The method of claim 12,

Forming the coating layer is performed for a predetermined time, the predetermined time is a coating method, characterized in that 5 to 10 minutes range.
A coating layer comprising molybdenum-containing inorganic particles prepared by the coating method of any one of claims 7 to 13.