KR20220067353A - Manufacturing method for hybrid photocatalystic varnish having hydrophilicity and hydrophobicity - Google Patents

Abstract

The present application relates to a photocatalyst, and more specifically, to a hybrid photocatalyst which comprises: photocatalyst particles; a hydrophilicity unit formed on a surface of the photocatalyst particles; and a hydrophobicity unit formed on the surface of the photocatalyst particles, wherein the hydrophilicity unit and the hydrophobicity unit are formed on the surface of the photocatalyst particles in a form in which at least a part is connected. A hybrid photocatalyst paint according to the present application suppresses direct contact between the binder of the paint and the photocatalyst particles so that one or more of improvement in antifouling action compared to the prior art, suppression of chalking (falling due to decomposition of an organic binder by the action of the photocatalyst) phenomenon, and improvement in durability can be expressed.

Description

Hybrid photocatalytic paint manufacturing method having hydrophilicity and hydrophobicity

The present application relates to a method for preparing a hybrid photocatalytic paint having hydrophilicity and hydrophobicity.

The exterior wall of the building is easily dirty due to the adhesion of oil particles contained in the exhaust gas of automobiles, etc., as well as dust floating in the air. In particular, in the case of oil, it hardens over time and cannot be easily cleaned by washing with water.

When the photocatalyst receives ultraviolet rays, it has strong oxidizing power and can decompose the oil component. Specifically, when a photocatalyst is applied to a paint, etc., it reduces the adhesion of pollutants due to its strong oxidizing power, and water forms a water film due to superhydrophilicity to drop pollutants, thereby preventing dirt and fogging. can be exercised

Sufficient ultraviolet rays (sunlight) reach the outer wall of the building, and the amount of ultraviolet rays sufficient to exhibit photocatalytic ability even in the shaded areas can be secured by reflection from the surroundings. Considering that the paint on the exterior wall of a building becomes dirty and needs to be replaced every few years, it is necessary to develop a photocatalytic paint that maintains cleanliness for a long time.

The initial anti-fouling photocatalyst paint product was made by mixing a titanium oxide photocatalyst with the paint, and when applied to the exterior wall of the building, the organic material of the paint was decomposed by light and fell together with the titanium oxide powder. When the outer wall of the building becomes dirty, the titanium oxide photocatalyst layer is peeled off and a clean wall appears. However, these products may look clean from a distance, but there are problems in that the durability of the paint is poor, hands and clothes become dirty when they touch the wall, and fine dust is generated by dispersing the fallen particles.

Recently, the air purification ability of photocatalyst products (paints, tiles, etc.) applied to the exterior walls of buildings has been reported, and the NOx removal capacity of 200 m ² photocatalytic tiles is equivalent to about 14 poplars. Photocatalyst paints are attracting more attention because they contribute to environmental purification in the same way as planting trees when photocatalysts are installed on the exterior walls of buildings.

However, when a photocatalyst powder is mixed with a general paint when manufacturing a conventional photocatalytic paint, a phenomenon in which the powder falls due to the occurrence of a chalking phenomenon is induced.

Accordingly, in the prior art, it is common to apply one or two layers of an intermediate film to prevent chalking, and then apply a transparent and excellent photocatalytic coating agent. In this case, the photocatalytic effect is excellent but the operation is very inconvenient. Alternatively, photocatalyst paints prepared by pretreating intermediate coating components (silica, apatite, etc.) on the surface of the photocatalyst powder are sold at high prices in Japan and Germany, but their price-performance ratio is problematic.

The technology that is the background of the present application is disclosed in Korean Patent Publication No. 1901123.

The present application is intended to solve the problems of the prior art described above, and compared to the prior art, a hybrid photocatalyst and its hybrid photocatalyst that exhibits at least one of improved antifouling action, suppression of choking (falling due to decomposition of organic binder due to the action of photocatalyst), and improved durability It aims to provide a manufacturing method.

Another object of the present invention is to provide a hybrid photocatalyst paint including the hybrid photocatalyst and a method for manufacturing the same.

Another object of the present invention is to provide a member coated with the hybrid photocatalytic paint.

However, the technical problems to be achieved by the embodiments of the present application are not limited to the technical problems described above, and other technical problems may exist.

As a technical means for achieving the above technical problem, the first aspect of the present application relates to a photocatalyst, including a photocatalyst particle, a hydrophilic part formed on the surface of the photocatalyst particle, and a hydrophobic part formed on the surface of the photocatalyst particle , It provides a hybrid photocatalyst, wherein the hydrophobic portion and the hydrophilic portion are formed on the surface of the photocatalyst particles in a form in which at least a portion is connected.

According to the exemplary embodiment of the present application, the hydrophilic portion may include Al(OH) ₃ , but is not limited thereto.

According to the exemplary embodiment of the present application, the Al(OH) ₃ precursor is Al ₂ (SO ₄ ) ₃ , and the Al(OH) ₃ may be formed by hydrolysis and pH adjustment of the precursor, but this It is not limited.

According to one embodiment of the present application, the photocatalyst particles may include TiO ₂ , but is not limited thereto.

According to the exemplary embodiment of the present application, the hydrophobic portion may include a material in which a material represented by the following Structural Formula 1 is hydrolyzed, but is not limited thereto.

[Structural Formula 1]

(In Structural Formula 1, R ₁ to R ₄ are each independently F, Cl, Br, or I of a halogen element, H, a substituted or unsubstituted C ₂ to C ₂₀ linear or branched alkyl group, substituted or unsubstituted a C ₂ to C ₂₀ aryl group, a substituted or unsubstituted C ₂ to C ₂₀ alkoxy group, a substituted or unsubstituted C ₂ to C ₂₀ alkenyl group, a substituted or unsubstituted C ₂ to C ₂₀ alky a nyl group, a substituted or unsubstituted C ₂ to C ₂₀ cycloalkyl group, or a substituted or unsubstituted C ₂ to C ₂₀ heteroaryl group).

In addition, a second aspect of the present application relates to a method for preparing a photocatalyst, comprising the steps of forming a hydrophilic moiety on photocatalyst particles and forming a hydrophobic moiety on the photocatalyst particles. It provides a method for producing a hybrid photocatalyst.

According to the exemplary embodiment of the present application, the forming of the hydrophilic part may include hydrolyzing a precursor of the hydrophilic part, but is not limited thereto.

According to one embodiment of the present application, the forming of the hydrophilic portion may be performed in an environment having a pH of 7.5 to 9.5, but is not limited thereto.

According to one embodiment of the present application, the forming of the hydrophobic portion includes coating the photocatalyst particles as a first hydrophobic material represented by the following structural formula 1 and coating the photocatalyst particles as a second hydrophobic material represented by the following structural formula 1 It may include a step of coating, but is not limited thereto.

[Structural Formula 1]

(In Structural Formula 1, R ₁ to R ₄ are each independently F, Cl, Br, or I of a halogen element, H, a substituted or unsubstituted C ₂ to C ₂₀ linear or branched alkyl group, substituted or unsubstituted a C ₂ to C ₂₀ aryl group, a substituted or unsubstituted C ₂ to C ₂₀ alkoxy group, a substituted or unsubstituted C ₂ to C ₂₀ alkenyl group, a substituted or unsubstituted C ₂ to C ₂₀ alky a nyl group, a substituted or unsubstituted C ₂ to C ₂₀ cycloalkyl group, or a substituted or unsubstituted C ₂ to C ₂₀ heteroaryl group).

According to one embodiment of the present application, the first hydrophobic material and the second hydrophobic material are each independently TEOS (tetraethyl orthosilicate), R-Si-(OEt) ₃ dimethyldichlorosilane (Dimethyldichlorosilane), and combinations thereof It may include one selected from the group consisting of, but is not limited thereto.

In this regard, the R-Si-(OEt) ₃ is propyltriethoxy silane (R=CH ₂ -CH ₂ -CH ₃ ), octyltriethoxy silane (R=(CH ₂ ) ₇ -CH ₃ ), dotasyltriethoxy silane (R= (CH ₂ ) ₁₁ CH ₃ ), or trialkoxy silane having an alkyl group of octadecyltrimethoxy silane (R=(CH ₂ ) ₁₇ -CH ₃ ), but is not limited thereto.

According to one embodiment of the present application, as the length of the alkyl group R of R-Si-(OEt) ₃ increases, the hydrophobicity of the surface of the hybrid photocatalyst or the photocatalyst particle may increase, but is not limited thereto.

According to one embodiment of the present application, the forming of the hydrophobic portion may include hydrolyzing the first hydrophobic material and/or the second hydrophobic material, but is not limited thereto.

According to the exemplary embodiment of the present application, the first hydrophobic material may be formed on the surface of the photocatalyst particle in a form in which at least a portion is connected to the hydrophilic part, but is not limited thereto.

According to the exemplary embodiment of the present application, the second hydrophobic material may be formed on the surface of the photocatalyst particle in a form in which at least a portion of the hydrophilic portion or the first hydrophobic material is connected, but is not limited thereto.

In addition, a third aspect of the present application relates to a photocatalytic paint, and relates to a hybrid photocatalytic paint including the hybrid photocatalyst and the binder according to the first aspect.

In addition, a fourth aspect of the present application relates to a method for producing a photocatalytic paint, comprising the steps of preparing a hybrid photocatalyst by the method for producing a hybrid photocatalyst according to the second aspect, and mixing the hybrid photocatalyst with a binder It relates to a method for manufacturing a photocatalytic paint.

In addition, a fifth aspect of the present application relates to a member and a photocatalyst coating material applied on the member and comprising the hybrid photocatalytic paint according to the third aspect.

The above-described problem solving means are merely exemplary, and should not be construed as limiting the present application. In addition to the exemplary embodiments described above, additional embodiments may exist in the drawings and detailed description.

According to the above-mentioned means for solving the problems of the present application, the hybrid photocatalytic paint according to the present application suppresses direct contact between the binder of the paint and the photocatalyst particles, and thus improves the antifouling action compared to the prior art, and chokes (falling due to decomposition of the organic binder due to the action of the photocatalyst) ) suppression of development, and improvement of durability may be expressed.

More specifically, according to the above-described problem solving means of the present application, when the photocatalytic paint is applied on the member, the decomposition of the binder or the binder can be suppressed (choking phenomenon is suppressed) by the photocatalyst particles, compared to the prior art Durability may be improved.

In addition, the hybrid photocatalytic paint according to the present application may have a porous structure on the surface to which the photocatalytic particles are exposed when applied to a member, thereby maximizing the ability to remove NO.

Specifically, the hybrid photocatalytic paint according to the present application can remove 0.4 μmol to 0.6 μmol of NO in the air per hour, and the production amount of NO ₂ compared to the removal amount of NO is less than 35%, effectively reducing nitrogen oxides, the main culprit of air pollution can be removed

In addition, the surface of the member to which the hybrid photocatalytic paint according to the present application is applied may have a superhydrophilic property, and thus the antifouling action may be improved (eg, the oil may be removed by water even if oil is attached to the surface).

However, the effects obtainable herein are not limited to the above-described effects, and other effects may exist.

1 is a schematic diagram of a photocatalyst according to an embodiment of the present application.
2 is a flowchart illustrating a method for preparing a hybrid photocatalyst according to an embodiment of the present application.
3 is a schematic diagram illustrating a method for preparing a hybrid photocatalyst according to an embodiment of the present application.
4 is a schematic diagram of a photocatalyst application member according to an embodiment of the present application.
5 (a) and (b) are SEM images of a photocatalyst according to an embodiment of the present application, and (c) to (e) are SEM images of a photocatalyst according to a comparative example of the present application.
6A to 6D are SEM images of a photocatalyst according to an embodiment of the present application.
7A to 7D are SEM images of a photocatalyst according to a comparative example of the present application.
8 (a) to (c) are photographs of testing the antifouling properties of photocatalysts according to Examples and Comparative Examples of the present application.

Hereinafter, embodiments of the present application will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art to which the present application pertains can easily carry out.

However, the present application may be implemented in several different forms and is not limited to the embodiments described herein. And in order to clearly explain the present application in the drawings, parts irrelevant to the description are omitted, and similar reference numerals are attached to similar parts throughout the specification.

Throughout this specification, when a part is "connected" to another part, this includes not only the case of being "directly connected", but also the case of being "electrically connected" with another element interposed therebetween. do.

Throughout this specification, when a member is positioned “on”, “on”, “on”, “on”, “under”, “under”, or “under” another member, this means that a member is positioned on the other member. It includes not only the case where they are in contact, but also the case where another member exists between two members.

Throughout this specification, when a part "includes" a certain component, it means that other components may be further included, rather than excluding other components, unless otherwise stated.

As used herein, the terms "about," "substantially," and the like are used in a sense at or close to the numerical value when the manufacturing and material tolerances inherent in the stated meaning are presented, and to aid in the understanding of the present application. It is used to prevent an unconscionable infringer from using the mentioned disclosure in an unreasonable way. Also, throughout this specification, "step to" or "step to" does not mean "step for".

Throughout this specification, the term "combination of these" included in the expression of the Markush form means one or more mixtures or combinations selected from the group consisting of the components described in the expression of the Markush form, and the components It is meant to include one or more selected from the group consisting of.

Throughout this specification, reference to “A and/or B” means “A or B, or A and B”.

Throughout this specification, the description of "substituted" indicates that a hydrogen atom in a compound is a halogen atom (F, Br, Cl or I), a hydroxy group, an alkoxy group, a nitro group, a cyano group, an amino group, an azido group, an amidino group, a hydrazino group group, hydrazono group, carbonyl group, carbamyl group, thiol group, ester group, carboxyl group or its salt, sulfonic acid group or its salt, phosphoric acid or its salt, C ₁ to C ₂₀ alkyl group, C ₂ to C ₂₀ alkenyl group, C ₂ to C ₂₀ alkynyl group, C ₆ to C ₃₀ aryl group, C ₇ to C ₃₀ arylalkyl group, C ₁ to C ₄ alkoxy group, C ₁ to C ₂₀ heteroalkyl group, C ₃ to C ₂₀ heteroarylalkyl group, C ₃ to It means substituted with a substituent selected from a C ₃₀ cycloalkyl group, a C ₃ to C ₁₅ cycloalkenyl group, a C ₆ to C ₁₅ cycloalkynyl group, a C ₂ to C ₂₀ heterocycloalkyl group, and combinations thereof.

Hereinafter, the method for manufacturing a hybrid photocatalytic paint having hydrophilicity and hydrophobicity of the present application will be described in detail with reference to embodiments, examples, and drawings. However, the present application is not limited to these embodiments and examples and drawings.

As a technical means for achieving the above technical problem, the first aspect of the present application relates to a hybrid photocatalyst, wherein the photocatalyst particle 100, the hydrophilic part 200 formed on the surface of the photocatalyst particle 100, and the photocatalyst It includes a hydrophobic portion 300 formed on the surface of the particle 100, wherein the hydrophobic portion 300 and the hydrophilic portion 200 are formed on the surface of the photocatalytic particle 100 in a form in which at least a portion is connected. It provides a hybrid photocatalyst (10).

1 is a schematic diagram of a hybrid photocatalyst according to an embodiment of the present application.

The hydrophilic part 200 according to the present application means a part having hydrophilicity, and the hydrophilic part 200 may include hydrophilic particles or a hydrophilic coating layer formed on the surface of the photocatalyst particle 100 .

The hydrophobic portion 300 according to the present application means a portion having hydrophobicity, and the hydrophobic portion 300 may include hydrophobic particles or a hydrophobic coating layer formed on the surface of the photocatalytic particle 100 .

According to one embodiment of the present application, the hydrophobic portion 300 may be formed on the surface of the photocatalytic particle 100 or the hydrophilic portion 200, but is not limited thereto.

In this regard, the properties of the surface of the hybrid photocatalyst 10 may be changed according to the material formed on the outermost part of the photocatalyst particle 100 .

For example, on the surface of the photocatalyst particle 100, the hydrophilic part 200 is exposed to the outside (a region having hydrophilicity) and the hydrophobic part 300 is connected to the hydrophilic part 200 to the hydrophobic part ( A region (a region having hydrophobicity) to which 300 is exposed to the outside may be formed as a hybrid.

According to the exemplary embodiment of the present application, the hydrophilic portion 200 may include Al(OH) ₃ , but is not limited thereto.

According to the exemplary embodiment of the present application, the Al(OH) ₃ precursor is Al ₂ (SO ₄ ) ₃ , and the Al(OH) ₃ may be formed by hydrolysis and pH adjustment of the precursor, but this It is not limited.

According to one embodiment of the present application, the hydrophobic portion 300 may include a material in which a material represented by the following Structural Formula 1 is hydrolyzed, but is not limited thereto:

[Structural Formula 1]

(In Structural Formula 1, R ₁ to R ₄ are each independently F, Cl, Br, or I of a halogen element, H, a substituted or unsubstituted C ₂ to C ₂₀ linear or branched alkyl group, substituted or unsubstituted a C ₂ to C ₂₀ aryl group, a substituted or unsubstituted C ₂ to C ₂₀ alkoxy group, a substituted or unsubstituted C ₂ to C ₂₀ alkenyl group, a substituted or unsubstituted C ₂ to C ₂₀ alky a nyl group, a substituted or unsubstituted C ₂ to C ₂₀ cycloalkyl group, or a substituted or unsubstituted C ₂ to C ₂₀ heteroaryl group).

For example, R ₁ is a substituted or unsubstituted C ₂ to C ₂₀ linear or branched alkyl group, and R ₂ to R ₄ may be an ethoxy group, but is not limited thereto. Specifically, for example, in the material represented by Structural Formula 1, R ₂ to R ₄ are OEt, and R ₁ is CH ₂ CH ₂ CH ₃ , (CH ₂ ) ₇ CH _{3 ,} (CH ₂ ) ₁₁ CH ₃ , or (CH ₂ ) ₁₇ CH ₃ It may be any one of propyltriethoxy silane, octyltriethoxy silane, dodecyltriethoxy silane, or octadecylpropylmethoxy silane corresponding to any one of, but It is not limited.

According to the exemplary embodiment of the present application, as the length of the alkyl group R of R—Si—(OEt) ₃ increases, the hydrophobicity of the surface may increase, but is not limited thereto.

According to the exemplary embodiment of the present application, the photocatalytic particles 100 may include TiO ₂ , but is not limited thereto.

For example, since the hydrophilic portion of TiO ₂ itself on the surface of the photocatalyst particle 100 TiO ₂ is small, in order to bond many hydrophobic groups, Al ₂ (SO ₄ ) ₃ is introduced as Al(OH) ₃ by hydrolysis, or TEOS and triethoxy silane containing an alkyl group may be directly bonded onto TiO ₂ . When the TEOS and triethoxy silane containing an alkyl group are hydrolyzed and coated on the surface of TiO ₂ , a portion containing a lot of TEOS becomes hydrophilic, and a portion containing triethoxy silane containing an alkyl group is hydrophobic. As will be described later, the hydrophobic portion 300 of the hybrid photocatalyst 10 may push out the hydrophilic paint component and induce the paint to be coupled to the hydrophilic portion 200 , and if the hydrophobic group of the hybrid photocatalyst 10 is large, water-soluble It causes the effect of floating the photocatalyst particles 100 above the paint liquid.

According to one embodiment of the present application, the hydrophobic portion 300 and the hydrophilic portion 200 may be formed on the surface of the photocatalytic particle 100 in a form in which at least a portion is connected, but is not limited thereto.

In the hybrid photocatalyst 10 of FIG. 1 , the hydrophilic part 200 includes a particle formed on the surface of the photocatalyst particle 100 and a material in which three rectangles formed on the particle are combined, and the hydrophobic part 300 denotes a set of free curves formed on the surface of the hydrophilic part 200 or the photocatalytic particle 100 .

A free curve according to the present application means a line formed without regularity in shape, and the hydrophobic portion 300 of FIG. 1 may include a material existing in the form of a line that does not have a regular shape.

According to the exemplary embodiment of the present application, hydrophilicity and hydrophobicity may be simultaneously expressed on the surface of the hybrid photocatalyst 10 .

For example, when the photocatalyst particle 100 is TiO ₂ , the hydrophilic portion of TiO ₂ itself is small in the initial stage, so Al ₂ (SO ₄ ) ₃ is hydrolyzed and introduced as Al-OH. In addition, when only TEOS is hydrolyzed and coated and bonded to the surface of TiO ₂ , a hydrophilic group of Si—OH silanol is generated on the surface of TiO ₂ . That is, the sum of the hydrophilic group of Al-OH and the hydrophilic group of Si-OH formed by hydrolysis of TEOS becomes a ratio or number indicating the hydrophilicity of the hybrid photocatalyst 10, and the ratio or number indicating the hydrophilicity is the photocatalyst particle It may mean the sum of the weights of TEOS and Al(OH) ₃ coated with a hydrophilicity on the surface of (100).

In addition, the amount of triethoxy silane containing an alkyl group formed on the surface of the TiO ₂ and the amount of dimethyldichlorosilane combined are a ratio or a numerical value indicating the hydrophobicity of the hybrid photocatalyst 10, and the ratio showing the hydrophobicity or The numerical value may mean the sum of the weights of triethoxysilane containing an alkyl group and dimethyldichlorosilane remaining as organic components on the surface of the photocatalyst particles 100 without being hydrolyzed.

As will be described later, when the hybrid photocatalyst 10 has a large amount of hydrophobic parts, it has the effect of pushing out the hydrophilic paint component and floating the photocatalyst particles 100 above the water-soluble paint solution, but the proportion of the hydrophobic part is too high. If it is large, it results in weakening of bonding strength with paint. In order to maximize the degree of exposure of the hybrid photocatalyst 10 to the surface while maintaining a strong bonding strength with the paint, it is necessary to maintain the hydrophilic region and the hydrophobic region in an appropriate ratio on the surface of the hybrid photocatalyst 10. A suitable weight ratio of TEOS and hydrophobic alkyl group-containing triethoxy silane may be 70: 30 to 30: 70, and in order to improve the hydrophobicity of the hybrid photocatalyst 10, the weight of the alkyl group-containing triethoxy silane can be raised

According to one embodiment of the present application, the hybrid photocatalyst 10 may have superhydrophilicity, but is not limited thereto.

In order for the hybrid photocatalyst 10 to have superhydrophilicity, the hydrophobic part 300 exposed to the surface of the hybrid photocatalyst 10 should be relatively small, so that the hydrophobic part 300 floats on the surface of the paint. It should be minimized, and the hybrid photocatalyst 10 should be mostly formed as the surface of the hydrophilic part 200 surrounded by SiO ₂ in a porous manner. To this end, the sum of the weights of dimethyl dichlorosilane and triethoxy silane containing an alkyl group forming the hydrophobic portion 200 in the hybrid photocatalyst 10 and the hydrophilic TEOS and Al(OH) coated on the surface of the hybrid photocatalyst 10 ) When the ratio of the sum of the weights of ₃ is not about 50:50 but about 20:80, even if the paint containing the hybrid photocatalyst 10 is applied on the member, the adhesion of hydrophobic contaminants is minimized and the anti-dirty effect can be seen. have.

Superhydrophilicity according to the present disclosure can be defined by the geometric shape of a water droplet on a flat surface. Specifically, a material having a contact angle with water of 20° or less may be defined as a superhydrophilic material.

According to the exemplary embodiment of the present application, the hybrid photocatalyst 10 may decompose selected from the group consisting of NO _x , SO _x , VOC (volatile organic compound), and combinations thereof, but is not limited thereto. For example, the hybrid photocatalyst 10 may oxidize NO to NO ₂ .

As will be described later, the NO ₂ formed by oxidizing the NO may be removed by dissolving it in a water film to be formed on the member including the hybrid photocatalyst 10 .

In addition, in an aqueous substrate coated with a paint containing the hybrid photocatalyst 10, the hydrophobic part 300 has a buoyant force so that the hybrid photocatalyst 10 floats to the surface of the aqueous member. can play a role in improving

In addition, the hydrophilic part 200 suppresses contact between the binder or the paint-coated member in the paint and the photocatalyst particles 100 so that the hybrid photocatalyst 10 includes the hybrid photocatalyst 10 The phenomenon of peeling off from the member to which the coating material was applied can be suppressed.

In addition, a second aspect of the present application relates to a method for manufacturing a photocatalyst, comprising the steps of forming a hydrophilic portion 200 on the photocatalyst particles 100 , and forming a hydrophobic portion 300 on the photocatalyst particles 100 . It relates to a method for producing a hybrid photocatalyst 10, including the steps.

With respect to the method for manufacturing a hybrid photocatalyst according to the second aspect of the present application, detailed descriptions of parts overlapping with the first aspect of the present application are omitted, but even if the description is omitted, the contents described in the first aspect of the present application The same can be applied to both sides.

2 is a flowchart illustrating a method of manufacturing a hybrid photocatalyst according to an embodiment of the present application, and FIG. 3 is a schematic diagram illustrating a method of manufacturing a hybrid photocatalyst according to an embodiment of the present application. In this regard, the step of coating the photocatalyst particle 100 of FIG. 3 as Al(OH) ₃ , TEOS, and an alkyl alkoxide corresponds to S100 of FIG. 2 , and the photocatalyst particle 100 in which the hydrophilic part 200 is formed. ) of SiCl ₂ (CH ₃ ) ₂ The silane coating step corresponds to S200 of FIG. 2 .

First, the hydrophilic part 200 is formed on the photocatalyst particle 100 (S100).

According to the exemplary embodiment of the present application, the forming of the hydrophilic portion 200 may include hydrolyzing a precursor of the hydrophilic portion 200, but is not limited thereto.

According to the exemplary embodiment of the present application, the forming of the hydrophilic part 200 may be performed in an environment having a pH of 7.5 to 9.5, but is not limited thereto.

For example, the step of forming the hydrophilic portion 200 may include hydrolyzing Al ₂ (SO ₄ ) ₃ in a condition of pH 8 to 9, but is not limited thereto.

According to one embodiment of the present application, with respect to 100 parts by weight of the photocatalyst particle 100 in which the hydrophilic part 200 is not formed, the photocatalyst particle 100 in which the hydrophilic part 200 is formed is the hydrophilic part 200. The hydrophilic part 200 may be formed to include 10 to 20 parts by weight, but is not limited thereto.

Then, the hydrophobic portion 300 is formed on the photocatalyst particle 100 (S200).

According to the exemplary embodiment of the present application, the forming of the hydrophobic portion 300 includes coating the photocatalyst particles 100 as a first hydrophobic material represented by the following Structural Formula 1 and forming the photocatalyst particles 100. It may include, but is not limited to, coating with a second hydrophobic material represented by Structural Formula 1:

[Structural Formula 1]

(In Structural Formula 1, R ₁ to R ₄ are each independently F, Cl, Br, or I of a halogen element, H, a substituted or unsubstituted C ₂ to C ₂₀ linear or branched alkyl group, substituted or unsubstituted a C ₂ to C ₂₀ aryl group, a substituted or unsubstituted C ₂ to C ₂₀ alkoxy group, a substituted or unsubstituted C ₂ to C ₂₀ alkenyl group, a substituted or unsubstituted C ₂ to C ₂₀ alky a nyl group, a substituted or unsubstituted C ₂ to C ₂₀ cycloalkyl group, or a substituted or unsubstituted C ₂ to C ₂₀ heteroaryl group).

For example, R ₁ is a substituted or unsubstituted C ₂ to C ₂₀ linear or branched alkyl group, and R ₂ to R ₄ may be an ethoxy group, but is not limited thereto.

In this regard, when the photocatalyst particles 100 having the hydrophilic part 200 formed on the surface thereof are coated as the first hydrophobic material and the second hydrophobic material, the first hydrophobic material and/or the second hydrophobic material Silver may be coated on the surface of the hydrophilic part 200 or the photocatalyst particle 100 .

According to one embodiment of the present application, the first hydrophobic material and the second hydrophobic material are each independently TEOS (tetraethyl orthosilicate), R-Si-(OEt) ₃ (provided that R is CH ₂ CH ₂ CH ₃ , ( CH ₂ ) ₇ CH ₃ , (CH ₂ ) ₁₁ CH ₃ , or (CH ₂ ) ₁₇ CH ₃ ), dimethyldichlorosilane, and combinations thereof may include, but are not limited to it is not going to be For example, the R-Si-(OEt) ₃ is propyltriethoxy silane (R=CH ₂ -CH ₂ -CH ₃ ), octyltriethoxy silane (R= (CH ₂ ) ₇ -CH ₃ ), trialkoxy silane having an alkyl group, such as dotasyltriethoxy silane (R= (CH ₂ ) ₁₁ CH ₃ ), octadecyltrimethoxy silane (R= (CH ₂ ) ₁₇ -CH ₃ ), As the length of the alkyl group R increases, the hydrophobicity of the surface of the photocatalyst particle 100 or the hybrid photocatalyst 10 may increase.

For example, the first hydrophobic material may include triethoxy silane containing an alkyl group such as TEOS and octyltriethoxy silane, and the second hydrophobic material may include dimethyldichlorosilane, but is not limited thereto. it is not

According to one embodiment of the present application, the forming of the hydrophobic portion 300 may include hydrolyzing the first hydrophobic material and/or the second hydrophobic material, but is not limited thereto. For example, the hydrophobic part 300 may be formed by hydrolyzing only one of the first hydrophobic material and the second hydrophobic material, or by hydrolyzing the first hydrophobic material and the second hydrophobic material. .

For example, by coating TEOS on the surface of the photocatalyst particle 100 to form a hydrophilic group in the form of Si—OH on the surface of the photocatalyst particle 100, and then alkyl on the surface of the photocatalyst particle 100 By bonding the group-containing triethoxy silane, the hydrophobic portion 300 bonded thereto may be formed. At this time, the ratio of TEOS and triethoxy silane containing an alkyl group is adjusted to 70: 30 to 30: 70, but in order to increase the hydrophobicity of the surface of the hybrid photocatalyst 10 or the photocatalyst particle 100, triethoxy silane containing an alkyl group In addition to increasing the ratio of silane, triethoxy silane containing an alkyl group may be additionally added so that the surface of the hybrid photocatalyst 10 or the photocatalyst particle 100 is coated with TEOS and triethoxy silane containing an alkyl group.

According to the exemplary embodiment of the present application, the first hydrophobic material may be coated on the surface of the photocatalytic particle 100 in a form in which at least a portion is connected to the hydrophilic part 200 , but is not limited thereto.

In addition, among the regions in which the first hydrophobic material is coated on the surface of the photocatalyst particle 100 , the region not connected to the hydrophilic part 200 and the hydrophobic part 300 is the surface of the hybrid photocatalyst 10 . It may exist as a region having hydrophilicity in

According to one embodiment of the present application, the second hydrophobic material may be coated on the surface of the photocatalytic particle 100 in a form in which at least a portion is connected to the hydrophilic portion 200 or the first hydrophobic material, However, the present invention is not limited thereto.

In addition, a third aspect of the present application relates to a photocatalytic paint, and relates to a hybrid photocatalytic paint including the hybrid photocatalyst 10 and a binder according to the first aspect.

The hybrid photocatalytic paint according to the present application refers to a paint including the hybrid photocatalyst 10 in which a hydrophobic portion and a hydrophilic portion are simultaneously expressed on the surface.

According to one embodiment of the present application, the binder of the hybrid photocatalytic paint may include an oil-based binder or an aqueous binder, but is not limited thereto.

The hybrid photocatalytic paint may be classified into an oil-based paint including an oil-based binder or a water-based paint including an aqueous binder according to use.

In this regard, as the oil-based binder and the water-based binder, oil-based binders and water-based binders used in general oil-based paints and water-based paints may be used.

According to the exemplary embodiment of the present application, contact between the binder and the photocatalyst particle 100 may be suppressed, but is not limited thereto.

The photocatalyst particle 100 is coated by the hydrophilic part 200 and the hydrophobic part 300 formed on the surface of the photocatalyst particle 100, so that the contact between the photocatalyst particle 100 and the binder is suppressed. can be

Since the contact between the photocatalyst particles 100 and the binder is suppressed, the hybrid photocatalyst 10 is irradiated with ultraviolet rays so that the photocatalyst particles 100 function as a catalyst, but the photocatalyst particles 100 do not decompose the binder it may not be

In general, a phenomenon in which a photocatalyst decomposes a paint or a member is called chalking, and the chalking phenomenon may be a factor of lowering durability of the photocatalyst. However, the hybrid photocatalyst 10 and the hybrid photocatalyst paint including the hybrid photocatalyst 10 according to the present application suppress the chalking phenomenon, thereby having superior durability compared to conventional photocatalyst and photocatalytic paints.

In addition, a fourth aspect of the present application relates to a method for manufacturing a photocatalytic paint, comprising the steps of preparing a hybrid photocatalyst 10 by the method for manufacturing a hybrid photocatalyst according to the second aspect, and mixing the hybrid photocatalyst 10 with a binder It relates to a method for producing a hybrid photocatalytic paint, comprising the step of:

In addition, a fifth aspect of the present application relates to a member and a photocatalyst coating material applied on the member and comprising the hybrid photocatalytic paint according to the third aspect.

The substrate of "application" according to the present application is a film of the hybrid photocatalytic paint on a member such as spray application, coating application, film formation, sol-gel application, roll application, inkjet application, dispersion application, spin coating application, etc. It can refer to forming.

The member according to the present disclosure may include, but is not limited to, a material that may come into contact with NO _x , SO _x , volatile organic compound (VOC), etc. in the atmosphere, such as an outer wall of a building, a road surface, and the like.

According to the exemplary embodiment of the present application, a vacant space may exist between the member and the layer to which the hybrid photocatalytic paint is applied, but is not limited thereto.

As described above, the hydrophilic part 200 and the hydrophobic part 300 may coexist on the surface of the photocatalytic particle 100 of the hybrid photocatalyst 10 of the hybrid photocatalytic paint. In this regard, in the member to which the hybrid photocatalytic paint is applied, a part of the photocatalyst particles 100 is coupled to the member, and a part of the photocatalytic particles 100 not coupled to the member may float to the surface of the member have.

In the case of the hybrid photocatalyst 10 having both the hydrophilic part 200 and the hydrophobic part 300, the ratio of the hydrophobic part 300 and the hydrophilic part 200 on the surface of the hybrid photocatalyst 10 is each in the manufacturing process. depends on the amount introduced.

For example, in the case of a water-based paint applied to a hydrophilic substrate and including the hybrid photocatalyst 10, the hydrophobic part 300 of the hybrid photocatalyst 10 repels the hydrophilic paint, which is a water base, and the hybrid photocatalyst ( 10) may be combined with the hydrophilic part 200 to be solidified. Conversely, in an organic solvent-based oil paint applied to a hydrophobic substrate and including the hybrid photocatalyst 10, the paint component is bonded to the hydrophobic portion 300 of the hybrid photocatalyst 10, and the hybrid photocatalyst 10. Since the hydrophilic part 200 of the oil-based paint is pushed down, it appears as a result of causing the same effect as applied to the hydrophobic substrate whether the paint containing the hybrid photocatalyst 10 is applied to the hydrophilic substrate. That is, even if the same hybrid photocatalyst 10 is used, in the organic paint system, since the hydrophobic portion 300 acts as a bonding medium, TiO ₂ particles are not buried inside the paint film, but are exposed to the surface of the paint film as well as formed on the surface. Since the nano silica porous layer does not directly contact the binder of the organic paint, side effects such as chalking can be suppressed.

In order to maximize the degree of exposure to the surface while maintaining a strong bonding strength with the paint, it is necessary to maintain the hydrophilic part 200 and the hydrophobic part 300 in an appropriate ratio on the surface of the photocatalytic particle 100. For this purpose, hydrolysis The appropriate weight ratio of the total weight of TEOS and Al(OH) ₃ and the total weight of triethoxysilane and dimethyl chlorosilane containing an alkyl group is 50: 50 to 30: 70 It is preferable to adjust it within the ratio range of

According to the exemplary embodiment of the present application, the empty space may inhibit the hybrid photocatalytic paint from decomposing the member, but is not limited thereto.

Since the film coated with the hybrid photocatalyst paint has superhydrophilicity, a water film may be formed by the superhydrophilicity when water is provided on the surface of the photocatalyst coating material. The water film may remove contaminants or scattering products that may exist on the surface of the photocatalytic coating material.

For example, the water film may remove NO ₂ generated by the catalytic action of the hybrid photocatalyst 10 and/or scattering products such as dust formed on the photocatalyst coating material.

According to the exemplary embodiment of the present application, the region to which the hybrid photocatalyst 10 is exposed in the film coated with the hybrid photocatalytic paint may have a porous structure, but is not limited thereto.

Due to the porous structure, the hybrid photocatalyst 10 of the photocatalyst coating material may have an increased contact area with air pollutants such as NO _x , SO _x , and VOC.

The present application will be described in more detail through the following examples, but the following examples are for illustrative purposes only and are not intended to limit the scope of the present application.

[Example 1-1]: Preparation of hybrid photocatalyst

With respect to 100 parts by weight of the TiO ₂ powder, Al ₂ (SO ₄ ) ₃ corresponding to 10% to 20% of the weight of the TiO ₂ powder was taken and dissolved in water, and the TiO ₂ powder was added to the extent that it was wetted. Then, after standing for 30 minutes, the pH of the solution in which Al ₂ (SO ₄ ) ₃ is dissolved through ammonia water or NaOH is adjusted to a condition of 8 to 9 and hydrolyzed to form a hydroxyl group (-OH) on the surface After the TiO ₂ particles were coated with Al(OH) ₃ , distilled water was added to wash and filter the TiO ₂ particles.

Then, tetraethyl orthosilicate (TEOS) and triethoxysilane (R—Si(OEt) ₃ containing an alkyl group corresponding to 30% to 60% of the weight of the TiO ₂ powder (provided that R is CH ₂ CH ₂ CH ₃ , (CH ₂ ) ₇ CH ₃ , (CH ₂ ) ₁₁ CH ₃ ), or (CH ₂ ) an alkyl group of ₁₇ CH ₃ ) is added, and ethanol corresponding to twice the weight of the TiO ₂ powder, the TiO ₂ Water corresponding to 20% to 40% of the weight of the powder, and HCl corresponding to 20% of the weight of the TiO ₂ powder are added, and hydrolyzed for 6 hours with stirring to make the Al(OH) ₃ coated The surface of TiO ₂ was coated.

In this regard, if the reaction temperature is maintained at 40°C to 50°C, the reaction time can be shortened to 3 hours.

Subsequently, (CH ₃ ) ₂ -Si-Cl ₂ was hydrolyzed to hydrophobically coat the surface of TiO ₂ to form a hybrid photocatalyst. Specifically, (CH ₃ ) ₂ -Si-Cl ₂ corresponding to 10% to 30% of the weight of the TiO ₂ powder is added, stirred and reacted at room temperature for 2 hours to coat the surface of TiO ₂ Hydrophobicity was controlled. For the control of surface hydrophobicity, the amount of (CH ₃ ) ₂ -Si-Cl ₂ added was controlled by observing the degree of precipitation or floating of the final TiO ₂ powder obtained.

[Example 1-2]: Preparation of member coated with hybrid photocatalytic paint

The hybrid photocatalyst was mixed with an aqueous paint to form a hybrid photocatalyst paint. Then, the member coated with the hybrid photocatalyst was formed by coating the paint on the substrate.

[Comparative Example 1]

TiO ₂ as Al(OH) ₃ , TEOS, R-Si(OEt) ₃ , and (CH ₃ ) ₂ -SI-Cl ₂ was mixed with a water-based paint to form a photocatalytic paint without performing a coating step. Then, the member coated with the photocatalyst was formed by coating the paint on the substrate.

5(a) and (b) are SEM images of the photocatalyst according to the embodiment, (c) to (e) are SEM images of the photocatalyst according to the comparative example, and FIGS. 6a to 6d are the embodiments SEM images of the photocatalyst according to , and FIGS. 7A to 7D are SEM images of the photocatalyst according to the comparative example. Specifically, FIGS. 6A, 6C, 7A, and 7C are SEM images before leaving the member according to the Example or the Comparative Example under an ultraviolet condition of 350 W/m ² intensity for 2 weeks, and FIG. 6b , 6D, 7B, and 7D are SEM images after leaving the member according to the Example or the Comparative Example in an ultraviolet condition of an intensity of 350 W/m ² for 2 weeks.

In this regard, a portion in which a length is indicated (a portion indicated by a red dotted line) is present in FIGS. 6A to 7D . The length of the portion marked with the length in FIG. 6A is 1.029 μm, the length of the portion marked with the length in FIG. 6B is 1.029 μm, and the length of the portion marked with the length in FIG. 6C is 1.067 μm, and in FIG. 6D , the length is The length of the marked area is 1.067 μm.

In addition, the length of the portion marked with the length in FIG. 7A is 877.1 nm, the length of the portion marked with the length in FIG. 7B is 1.029 μm, and the length of the portion marked with the length in FIG. 7C is 323.9 nm, and in FIG. 7D The length of the portion marked with the length is 400.1 nm.

6A, 6B, 7A, and 7B are SEM images with a magnification of 5,000 times and an acceleration voltage of 10 kV, and FIG. 6C. 6D, 7C, and 7D are SEM images with a magnification of 10,000 times and an acceleration voltage of 10 kV.

Referring to FIG. 5 , TiO ₂ of the member coated with the hybrid photocatalyst according to the embodiment has both hydrophilicity and hydrophobicity, so that it can have a porous structure and a smooth surface structure at the same time. However, since TiO ₂ of the member coated with the photocatalyst according to the comparative example has either hydrophobicity or hydrophilicity, it may have different physical properties from the hybrid photocatalyst according to the embodiment.

6 to 7 , the surface of the member to which the hybrid photocatalyst is applied (Example 1-2) is insignificant even when irradiated with UV light of 350 W/m ² intensity for 2 weeks, but the photocatalyst is applied to the member (Comparative Example 1) When irradiated with 350 W / m ² of UV light for 2 weeks, it can be seen that many particles are formed on the surface. Therefore, the hybrid photocatalyst (TiO ₂ having both hydrophobicity and hydrophilicity) suppresses the choking phenomenon compared to the conventional photocatalyst (TiO ₂ ), which means that the durability of the photocatalyst is improved.

[Experimental Example 1]

Various photocatalytic paints were prepared by examining the treatment method, additive material, and mixing method before manufacturing the photocatalyst, and the NO removal performance (NO conversion catalyst function) of the photocatalytic paints through the ISO 22197-1 test method is shown in Table 1 described in.

Sample NO total amount
(μmol) NO Removal
(μmol) NO Removal Rate
(%) NO ₂ production
(μmol) A 7.61 0.04 (0.20) 0.53 0.01 (25%) B 7.61 0.10 (0.50) 1.26 0.01 (10%) C 7.63 0.15 (0.75) 2.38 0.06 (40%) D 7.59 0.38 (1.90) 4.96 0.01 (3%) E 7.49 0.58 (2.90) 7.81 0.07 (12%) F 7.59 0.59 (2.95) 7.79 0.29 (49%) G 7.56 1.02 (5.10) 13.48 0.16 (16%) H 7.54 1.17 (5.85) 15.50 0.36 (31%)

In Table 1, the number in parentheses in the NO removal amount means the amount of NO removed for 5 hours, and % in the parentheses in the NO ₂ production amount means (NO ₂ production amount)/(NO removal amount).

In addition, in Table 1, Sample A contains a TiO ₂ photocatalyst without any surface treatment, and is a paint having a photocatalyst content of 10%, and Sample B has a hydrophilic content and a hydrophobic content ratio of 10: 90, and a photocatalyst content 12% of the paint, Sample C is a paint with a hydrophilic content and hydrophobic content ratio of 20:80, a photocatalyst content of 12%, Sample D has a hydrophilic content and hydrophobic content ratio of 30:70, and a photocatalyst content 10% of the paint, Sample E is a paint with a hydrophilic content and hydrophobic content ratio of 30:70, a photocatalyst content of 12%, Sample F has a hydrophilic content and hydrophobic content ratio of 40:60, and a photocatalyst content 12% phosphorus paint, Sample G has a 50:50 ratio of hydrophilic content and hydrophobic content, a 12% photocatalyst content, but not treated with dimethyldichlorosilane, Sample H has a hydrophilic content and hydrophobic content ratio It is 50:50, and it is a paint with a photocatalyst content of 12%. In this regard, the photocatalyst content refers to the weight % of the hybrid photocatalyst material included in the entire paint.

Referring to Table 1, the IH-0609-1, IH-0609-2, and IH-0609-3 paints that can remove 2.0 μmol to 3.0 μml of NO for 5 hours and have a relatively low NO ₂ production amount at the same time When applied to the exterior wall of a building, while effectively removing NO, it is possible to reduce the production of NO ₂ , another air pollutant.

[Experimental Example 2]

8 (a) to (c) are photographs of testing the antifouling properties of the photocatalysts according to the Examples and Comparative Examples. Specifically, the left side in each photo of FIG. 8 (a) is a member according to the embodiment. The right side means the member according to the comparative example. In addition, (b) of FIG. 8 is a photograph for testing the antifouling property of the member according to the embodiment.

Referring to FIG. 8 , the conventional photocatalytic paint-coated member does not remove oil even when water is sprayed on it. . However, the effect of removing the oil by the water was observed in the samples in Table 1 with a NO removal amount of 3.0 μmol/5h (0.6 μmol/h) or more.

The above description of the present application is for illustration, and those of ordinary skill in the art to which the present application pertains will understand that it can be easily modified into other specific forms without changing the technical spirit or essential features of the present application. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive. For example, each component described as a single type may be implemented in a dispersed form, and likewise components described as distributed may also be implemented in a combined form.

The scope of the present application is indicated by the following claims rather than the above detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present application.

Claims (16)

In the photocatalyst,
photocatalytic particles;
a hydrophilic part formed on the surface of the photocatalyst particle; and
a hydrophobic part formed on the surface of the photocatalyst particle;
including,
The hydrophobic part and the hydrophilic part will be formed on the surface of the photocatalyst particle in a form in which at least a part is connected,
Hybrid photocatalyst.
The method of claim 1,
The hydrophilic portion Al(OH) ₃ Will include, a hybrid photocatalyst.
3. The method of claim 2,
The Al(OH) ₃ precursor is Al ₂ (SO ₄ ) ₃ , and the Al(OH) ₃ is formed by hydrolysis and pH adjustment of the precursor, a hybrid photocatalyst.
The method of claim 1,
The photocatalyst particle is a hybrid photocatalyst comprising TiO ₂ .
The method of claim 1,
The hydrophobic part is a hybrid photocatalyst, wherein the material represented by the following Structural Formula 1 includes a hydrolyzed material:
[Structural Formula 1]

(In Structural Formula 1, R ₁ to R ₄ are each independently F, Cl, Br, or I of a halogen element, H, a substituted or unsubstituted C ₂ to C ₂₀ linear or branched alkyl group, substituted or unsubstituted a C ₂ to C ₂₀ aryl group, a substituted or unsubstituted C ₂ to C ₂₀ alkoxy group, a substituted or unsubstituted C ₂ to C ₂₀ alkenyl group, a substituted or unsubstituted C ₂ to C ₂₀ alky a nyl group, a substituted or unsubstituted C ₂ to C ₂₀ cycloalkyl group, or a substituted or unsubstituted C ₂ to C ₂₀ heteroaryl group).
In the method for producing a photocatalyst,
forming a hydrophilic part on the photocatalyst particles; and
forming a hydrophobic portion on the photocatalyst particles;
A method for producing a hybrid photocatalyst comprising a.
7. The method of claim 6,
The method for producing a hybrid photocatalyst, wherein the forming of the hydrophilic part comprises the step of hydrolyzing a precursor (precursor) of the hydrophilic part.
8. The method of claim 7,
The method for producing a hybrid photocatalyst, wherein the forming of the hydrophilic part is performed in an environment having a pH of 7.5 to 9.5.
7. The method of claim 6,
The step of forming the hydrophobic part comprises the steps of coating the photocatalyst particles as a first hydrophobic material represented by the following Structural Formula 1 and coating the photocatalyst particles as a second hydrophobic material represented by the following Structural Formula 1 , a method for preparing a hybrid photocatalytic paint:
[Structural Formula 1]

(In Structural Formula 1, R ₁ to R ₄ are each independently F, Cl, Br, or I of a halogen element, H, a substituted or unsubstituted C ₂ to C ₂₀ linear or branched alkyl group, substituted or unsubstituted a C ₂ to C ₂₀ aryl group, a substituted or unsubstituted C ₂ to C ₂₀ alkoxy group, a substituted or unsubstituted C ₂ to C ₂₀ alkenyl group, a substituted or unsubstituted C ₂ to C ₂₀ alky a nyl group, a substituted or unsubstituted C ₂ to C ₂₀ cycloalkyl group, or a substituted or unsubstituted C ₂ to C ₂₀ heteroaryl group).
10. The method of claim 9,
The first hydrophobic material and the second hydrophobic material are each independently TEOS (tetraethyl orthosilicate), R-Si-(OEt) ₃ (provided that R is CH ₂ CH ₂ CH ₃ , (CH ₂ ) ₇ CH ₃ , ( CH ₂ ) ₁₁ CH ₃ ), or (CH ₂ ) ₁₇ CH ₃ ), dimethyldichlorosilane (Dimethyldichlorosilane), and a method for producing a hybrid photocatalyst comprising one selected from the group consisting of combinations thereof.
11. The method of claim 10,
The forming of the hydrophobic portion will include hydrolyzing the first hydrophobic material and/or the second hydrophobic material.
11. The method of claim 10,
The method for producing a hybrid photocatalyst, wherein the first hydrophobic material is formed on the surface of the photocatalyst particle in a form in which at least a part of the hydrophilic part is connected.
13. The method of claim 12,
The method for producing a hybrid photocatalyst, wherein the second hydrophobic material is formed on the surface of the photocatalyst particles in a form in which at least a part of the hydrophilic part or the first hydrophobic material is connected.
In the photocatalytic paint,
The hybrid photocatalyst according to claim 1; and
comprising a binder;
Hybrid photocatalytic paint.
In the method for producing a photocatalytic paint,
preparing a hybrid photocatalyst by the method for preparing a hybrid photocatalyst according to claim 6; and
mixing the hybrid photocatalyst with a binder;
containing,
A method for producing a hybrid photocatalytic paint.
absence; and
The hybrid photocatalytic paint according to claim 14 applied on the member;
Including, a photocatalyst coating material.

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