Method for carrying photo-catalyst particle

Description: TECHNICAL FIELD [Detailed description of the invention]

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INDUSTRIAL APPLICABILITY The present invention relates to a method for supporting photocatalytic particles used for decomposing, purifying, detoxifying, or sterilizing dirty substances, odorous components, organic substances, and the like.

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PROBLEM TO BE SOLVED: To conventionally, a method described in Japanese Patent Application Laid-Open No. 57-122950 is known as a method for supporting this type of photocatalytic particles.

Hereinafter, the method for supporting the photocatalytic particles will be described with reference to FIG. 20. As shown in the figure, after applying the water glass 103 on the base material 102, the water glass 103 is brought into a dry state. Further, the photocatalyst particles 101 are uniformly dispersed and adhered onto the dry water glass 103 and fired at 300 ° C. for 30 minutes, and the photocatalyst particles 101 are adhered to the surface of the base material 102 via the water glass 103 to form a photocatalyst particle layer. Photocatalytic particles are supported on the base material 102.

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PROBLEM TO BE SOLVED: To solve a problem in such a conventional method of supporting photocatalyst particles, since the photocatalyst particles are buried in water glass and the surface of the photocatalyst particles is covered, light, a stain substance, and an odor component are contained in the photocatalyst particles. Since organic substances and the like do not reach, there is a problem that the activity as a photocatalyst is impaired, and it is required to support the photocatalyst particles without covering the surface.

Further, it is difficult for water glass to come into contact with all the photocatalyst particles, and there is a problem that the adhesion is insufficient and the supporting strength and durability are low. Is required to be high.

The present invention solves such a conventional problem, and in a method for supporting photocatalyst particles, a photocatalyst that does not impair the activity as photocatalyst particles and can improve the supporting strength and durability. It is an object of the present invention to provide a method for carrying particles.

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In the method for supporting photocatalyst particles of the present invention, in order to achieve the above object, a photocatalyst particle dispersed in water is applied to a substrate and then dried to form a photocatalyst particle layer. A binder mixed solution is applied to the photocatalyst particle layer and then dried, and the photocatalyst particles are supported by bonding the photocatalyst particles and between the photocatalyst particles and the substrate with a binder.

According to the present invention, it is possible to obtain a method for supporting photocatalyst particles that exposes the photocatalyst particles and forms a photocatalyst particle layer having high carrying strength and durability without impairing the activity as a photocatalyst.

In another method, a photocatalyst particle dispersed in a binder mixed solution is applied to a base material and then dried to form a photocatalyst particle layer, and the photocatalyst particle layer is coated with the binder mixed solution to form an inter-photocatalyst particle. , And a method for supporting the photocatalyst particles in which the photocatalyst particles and the base material are bonded with a binder.

According to the present invention, since the photocatalyst particles and the photocatalyst particles and the base material are first bonded with a binder, the photocatalyst particles once formed even if the binder mixed solution is newly applied. Since the layer does not decompose and the photocatalyst particles are supported by a small amount of binder, the photocatalyst particles are exposed, the activity as a photocatalyst is not impaired, and the photocatalyst that forms a photocatalyst particle layer having high carrying strength and durability is formed. A method for carrying particles can be obtained.

Another means is to repeatedly apply the binder mixed solution to the photocatalyst particle layer and dry it a plurality of times, and gradually bond the photocatalyst particles between the photocatalyst particles and between the photocatalyst particles and the substrate with a small amount of binder. This is the method of carrying the above.

According to the present invention, it is possible to obtain a method for supporting photocatalyst particles that exposes the photocatalyst particles and forms a photocatalyst particle layer having high carrying strength and durability without impairing the activity as a photocatalyst.

Another means is to apply a photocatalyst particle finely dispersed in dispersant-containing water to a substrate and then dry it to form a photocatalyst particle layer, and then apply a binder mixed solution to the photocatalyst particle layer and then dry it. This is a method for supporting photocatalytic particles.

According to the present invention, the photocatalyst particles are dispersed more finely, the binder mixed solution can easily penetrate into the details of the photocatalyst particle layer, and the photocatalyst particles are supported to form a photocatalyst particle layer having high carrying strength and durability. The method is obtained.

In another method, a photocatalyst particle and a water-soluble salt dispersed in water are applied to a base material and then dried to form a photocatalyst particle layer, and a resin binder mixed solution is applied to the photocatalyst particle layer. This is a method for supporting photocatalytic particles in which residual salts are removed by washing with water after post-drying.

According to the present invention, it is possible to obtain a method for supporting photocatalyst particles by exposing the photocatalyst particles to form a photocatalyst particle layer that does not impair the activity as a photocatalyst.

In another means, a photocatalyst particle dispersed in water is applied to a base material and then dried to form a photocatalyst particle layer, and water is applied to the photocatalyst particle layer and adsorbed in the pores of the photocatalyst particles. Water is adsorbed, then a resin binder mixed solution is applied to the photocatalyst particle layer and then dried, and the photocatalyst particles are supported by adsorbing the photocatalyst particles and between the photocatalyst particles and the substrate with a resin binder.

According to the present invention, when the mixed solution of resin binder is applied and dried, the adsorbed water in the pores of the photocatalyst particles is evaporated to form voids in the resin binder to expose the photocatalyst particles, and the photocatalyst particles are used as a photocatalyst. A method for supporting photocatalytic particles that forms a photocatalytic particle layer that does not impair the activity can be obtained.

In another method, a photocatalyst particle dispersed in water-soluble resin mixed water is applied to a base material and then dried to form a photocatalyst particle layer, and a resin binder mixed solution is applied to the photocatalyst particle layer and then dried. After that, the method for supporting the photocatalyst particles is such that the water-soluble resin is washed and removed with water.

According to the present invention, the photocatalyst particles are exposed, the water-soluble resin is washed with water to remove the photocatalyst particles, the photocatalyst particles are exposed, the activity as a photocatalyst is not impaired, and the supporting strength and durability are high. A method for supporting photocatalytic particles for forming a photocatalytic particle layer can be obtained.

Another means is to apply a photocatalyst particle and a water-insoluble high-boiling organic compound dispersed in a soluble organic solvent to a base material and then dry to form a photocatalyst particle layer. The photocatalyst particles were formed, a mixed solution of an inorganic binder was applied to the photocatalyst particle layer, and then dried, and the photocatalyst particles were adhered to each other and between the photocatalyst particles and the base material with an inorganic binder to form a photocatalyst particle layer. It is a thing.

According to the present invention, when the inorganic binder mixed solution is dried, the high boiling point organic compound is evaporated to expose the photocatalyst particles, and the photocatalyst particles are supported to form a photocatalyst particle layer that does not impair the activity as a photocatalyst. The method is obtained.

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BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, a photocatalyst particle dispersed in water is applied to a substrate and then dried to form a photocatalyst particle layer, and a binder mixed solution is applied to the photocatalyst particle layer and then dried. The method is to support the photocatalyst particles by adhering the photocatalyst particles between the photocatalyst particles and between the photocatalyst particles and the base material with a binder. In the first water drying, the skeleton is composed of only the photocatalyst particles, and when the photocatalyst particles are dried. In order for the photocatalyst particles to approach each other due to capillary condensation of water, a photocatalyst particle layer densely packed as a bulk is formed, and a binder mixed solution is further applied to the photocatalyst particle layer to create a space created between the photocatalyst particles. By infiltrating the binder mixed solution and drying the binder mixed solution, only the contact portion between the photocatalyst particles and the contact portion between the photocatalyst particles and the substrate were adhered with this binder, and the binder was made of the photocatalyst particles. The photocatalyst particles are supported on the base material while maintaining the space, and the contact portion between the photocatalyst particles and the contact portion between the photocatalyst particles and the base material can be adhered with a small amount of binder, minimizing the catalyst poisoning by the binder. It has the function of supporting the photocatalyst particles on the substrate.

Further, a photocatalyst particle obtained by finely dispersing the photocatalyst particles in water containing a dispersant is applied to a base material and then dried to form a photocatalyst particle layer, and a binder mixed solution is applied to the photocatalyst particle layer and then dried. As a method, the photocatalyst particles, which are aggregates of primary particles, are finely dispersed with a dispersant to form a uniform and finely packed photocatalyst particle layer, and the details of the space created between the photocatalyst particles are formed. Since the binder mixed solution is infiltrated and the photocatalyst particles are fine, there are many contact parts between the photocatalyst particles and the contact part between the photocatalyst particles and the base material. The contact portions between them can be adhered with a small amount of binder, and the photocatalytic particles can be supported on the substrate while minimizing the catalytic poisoning by the binder.

Further, a photocatalyst particle and a water-soluble salt dispersed in water are applied to a base material and then dried to form a photocatalyst particle layer, and a resin binder mixed solution is applied to the photocatalyst particle layer and then dried. The method is to support the photocatalyst particles by washing and removing the residual salt with water. After forming the photocatalyst particle layer with a resin binder, in order to remove the salt adhering to the photocatalyst particles, between the photocatalyst particles and the resin binder resin. A space can be created to prevent the binder from covering the entire photocatalytic particles, and the photocatalytic particles can be supported on the substrate while minimizing the catalytic poisoning by the resin binder.

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[Example]

(Example 1) As shown in FIGS. 1 to 4, the titanium oxide particles 1 which are photocatalytic particles have a structure in which primary particles 2 having a diameter of about Φ10 to 30 nm are aggregated, and the titanium oxide particles 1 are anatized. Therefore, it is fired at 200 to 800 ° C. Then, the titanium oxide particles 1 are dispersed in water 3, coated on the base material 6 and dried at 20 to 200 ° C. to form a photocatalyst particle layer 4. Then, silica gel 7 which is a binder mixed solution having a silica solid content of 5 to 50% by weight, preferably 5 to 30% by weight is applied and immersed in the photocatalyst particle layer 4 with respect to the titanium oxide particles 1 forming the photocatalyst particle layer 4. After that, it is dried at 20 to 200 ° C., and the silica gel 7 is dried between the titanium oxide particles 1 and the contact portion between the titanium oxide particles 1 and the base material 6 to gel the silica sol to obtain silica gel 5 as a binder, and further 200 to 500 ° C. The silica gel 5 is sintered to increase the strength of the silica gel 5 to form the photocatalyst particle layer 4.

According to the above configuration, the skeleton is composed of only the titanium oxide particles 1 in the first drying of the water 3, and the titanium oxide particles 1 are brought closer to each other by the capillary condensation of the water 3 in the drying, so that the titanium oxide particles are finely divided as a bulk. The photocatalyst particle layer 4 is formed, and the silica sol 7 is further applied to the photocatalyst particle layer 4. At this time, since it is not necessary to disperse the titanium oxide particles 1, the amount of the silica sol 7 applied can be small. , The contact portion between the titanium oxide particles 1 and the contact point between the titanium oxide particles 1 and the base material 6 with the silica gel 5 obtained by infiltrating the silica sol 7 into the space created between the titanium oxide particles 1 and drying the silica sol 7. The titanium oxide particles 1 are supported on the base material 6 while holding the space created by the titanium oxide particles 1 by adhering only the portions, and the contact portion between the titanium oxide particles 1 and the titanium oxide particles 1 and the base. The contact portion between the materials 6 can be adhered with a small amount of silica gel 5, the catalyst poison caused by the silica gel 5 covering the titanium oxide particles 1 is minimized, and the titanium oxide particles 1 have good adhesion and sufficient strength. It has the function of supporting the material 6.

In the examples, anataseized titanium oxide particles were used as the photocatalyst particles, but titanium hydroxide-containing titanium oxide or rutileized titanium oxide particles may be used instead of the titanium oxide particles, and the surface thereof may be treated with titanium oxide particles. Titanium oxide particles carrying a catalyst metal such as platinum, rutile, or palladium may be used, and any particles having a photocatalytic effect may be used, and there is no difference in the action and effect.

Further, although the binder is silica gel obtained by gelling silica sol, the binder may be water glass, silica hydroxide, alumina sol, titania sol, zirconia sol, and sol obtained by hydrolyzing tetraalkoxysilane. Further, although an epoxy resin is used as the binder, any resin paint such as urethane resin, acrylic resin, polysiloxane resin, and fluororesin may be used instead of the epoxy resin.

Further, the base material may be provided with irregularities to increase the contact points between the photocatalyst particles and the base material, thereby improving the adhesion between the photocatalyst layer and the base material.

Further, a primer may be applied to the base material in advance to improve the adhesion between the photocatalyst layer and the base material and the corrosion resistance of the base material.

(Example 2) FIGS. 5 to 7 show a silica sol 7 in which the titanium oxide particles 1 have a silica solid content of 2.5 to 25% by weight, preferably 2.5 to 15% by weight, based on the titanium oxide particles 1. To form a photocatalyst particle layer 4 after being applied to a base material 6 and then dried to form a photocatalyst particle layer 4, the silica solid content is 2.5 with respect to the titanium oxide particles 1 forming the photocatalyst particle layer 4 on the photocatalyst particle layer 4. Titanium oxide particles 1 that are coated with ~ 25% by weight, preferably 2.5 to 15% by weight of silica sol 7 and then dried to bond between the photocatalyst particles 1 and between the photocatalyst particles 1 and the substrate 6 with silica gel 5. It becomes the carrying method of.

According to the above configuration, the silica sol 7 is first dried, and since the amount of silica in the silica sol 7 is small, the titanium oxide particles 1 are finely packed as a bulk in order to bring the titanium oxide particles close to each other by the capillary condensation of water 3 during drying. A photocatalyst in which the contact portion of the titanium oxide particles 1 and a part of the contact portion between the titanium oxide particles 1 and the base material 6 are adhered to the silica gel 5 obtained by forming the photocatalyst particle layer 4 and drying the silica sol 7. The particle layer 4 is formed, the photocatalyst particle layer 4 is further coated with silica sol 7, and the dried silica gel 5 enhances the carrying strength of the photocatalyst particle layer 4, but a part of the photocatalyst particles 1 is already silica gel 5. Even if the silica sol 7 is immersed between the titanium oxide particles 1, the photocatalyst particle layer 4 does not re-dissociate due to swelling, and the space created by the titanium oxide particles 1 is maintained. The titanium oxide particles 1 are supported on the base material 6, and the contact portion between the titanium oxide particles 1 and the contact portion between the titanium oxide particles 1 and the base material 6 can be adhered with a small amount of silica gel 5. It has the effect of minimizing poison, having good adhesion, having sufficient strength, and supporting the titanium oxide particles 1 on the base material 6.

(Example 3) FIGS. 8 and 9 show the silica solid content in an amount of 2.5 to 25% by weight, preferably 2.5, based on the titanium oxide particles 1 forming the photocatalyst particle layer 4 in the photocatalyst particle layer 4. A method of supporting the titanium oxide particles 1 in which the photocatalyst particles 1 and the photocatalyst particles 1 and the base material 6 are adhered with silica gel 5 by repeating the application of ~ 15% by weight of the silica sol 7 and drying a plurality of times.

A photocatalyst particle layer 4 in which a contact portion of titanium oxide particles 1 and a part of a contact portion between the titanium oxide particles 1 and the base material 6 are adhered to silica gel 5 obtained by drying silica sol 7 according to the above configuration. The silica sol 7 was further applied to the photocatalyst particle layer 4, and the carrying strength of the photocatalyst particle layer 4 was repeatedly increased with the dried silica gel 5, and the silica sol 7 was immersed between the photocatalyst particles 1. Even if this is dried and gelled, the amount of silica in the silica sol 7 applied in one operation is small, so that the photocatalyst particle layer 4 may re-dissociate due to volume shrinkage when the silica sol 7 gels into silica gel 5. The titanium oxide particles 1 are supported on the base material 6 while holding the space created by the titanium oxide particles 1, and the contact portion between the titanium oxide particles 1 and the titanium oxide particles 1 and the base material 6 The contact portion between them can be adhered with a small amount of silica gel 5, the catalytic poisoning by the silica gel 5 is minimized, the adhesion is good, the strength is sufficient, and the titanium oxide particles 1 are supported on the base material 6.

(Example 4) In FIGS. 10 and 11, the photocatalyst particles 1 are finely dispersed with the dispersant-containing water 8, and the photocatalyst particles 1 are applied to the base material 6 and then dried to form the photocatalyst particle layer 4, further described above. A method for supporting titanium oxide particles 1 in which a silica sol 7 having a silica solid content of 5 to 50% by weight, preferably 5 to 20% by weight is applied to the titanium oxide particles 1 forming the photocatalyst particle layer 4 on the photocatalyst particle layer 4 and then dried. It becomes.

According to the above configuration, the photocatalyst particles 1 are dispersed in the dispersant-containing water 8 to a particle size of at least 1 μm or less, the water content in the first dispersant-containing water 8 is dried, and the skeleton is composed of the titanium oxide particles 1. When the titanium oxide particles 1 are brought closer to each other due to the capillary condensation of water during drying, a more finely packed photocatalyst particle layer 4 is formed as a bulk, and titanium oxide is formed as the particle size becomes smaller. The contact portion between the particles 1 and the contact portion between the titanium oxide particles 1 and the base material 6 are increased, and the silica sol 7 is further applied to the photocatalyst particle layer 4 to create a silica sol in the space created between the titanium oxide particles 1. The contact portion between the titanium oxide particles 1 increased by permeating the silica sol 7 with the dried silica gel 5 and the contact portion between the titanium oxide particles 1 and the base material 6 are adhered to each other, and the titanium oxide particles 1 are used. Titanium oxide particles 1 are supported on the base material 6 while holding the created space, and a small amount of silica gel 5 is used for the contact portion between the titanium oxide particles 1 and the contact portion between the titanium oxide particles 1 and the base material 6. It has the effect of supporting the titanium oxide particles 1 on the base material 6 by minimizing the catalytic poisoning caused by the silica gel 5 and having good adhesion and sufficient strength.

The dispersant remaining in the photocatalyst layer may be removed by washing with water after the silica sol is applied and dried, and there is no difference in the action and effect.

(Example 5) In FIGS. 12 and 13, the photocatalyst particles 1 and the water-soluble salt 11 are dispersed in water, coated on the base material 6 and then dried to form the photocatalyst particle layer 4. Further, the epoxy paint 10 which is a resin binder mixed solution is applied to the photocatalyst particle layer 4 in an amount of 5 to 50% by weight, preferably 5 to 20% by weight, based on the resin solid content of the titanium oxide particles 1 forming the photocatalyst particle layer 4, and then dried. This is a method for supporting the photocatalyst particles 1 in which the residual salt 11 is washed and removed with water.

According to the above configuration, the titanium oxide particles 1 form the photocatalyst particle layer 4 in the first drying of the water 3, and the titanium oxide particles 1 have the salt 11 attached to the photocatalyst particle layer 4. The contact portion between the titanium oxide particles 1 is provided with the epoxy resin 12, which is a resin binder obtained by applying the epoxy paint 10 and allowing the epoxy paint 10 to permeate into the space created between the titanium oxide particles 1. And, only the contact portion between the titanium oxide particles 1 and the base material 6 is adhered, and the titanium oxide particles 1 are supported on the base material 6 while maintaining the space created by the titanium oxide particles 1, and then the photocatalyst By washing the particle layer 4 with water, the salt 11 adhering to the titanium oxide particles 1 is removed, a gap is formed between the titanium oxide particles 1 and the epoxy resin 12, the catalytic poisoning by the epoxy resin 12 is minimized, and oxidation is performed. It has the function of supporting the titanium particles 1 on the base material 6.

Although an epoxy resin is used as the resin binder, any resin coating material such as urethane resin, acrylic resin, polysiloxane resin, and fluororesin may be used instead of the epoxy resin, and the effects thereof may differ. Does not occur.

(Example 6) In FIG. 14, the photocatalyst particles 1 are dispersed in water 3, the photocatalyst particles 1 are coated on the base material 6 and then dried to form the photocatalyst particle layer 4, and the photocatalyst particle layer 4 is further coated with water 3. Is applied to adsorb the adsorbed water 13 in the pores of the photocatalyst particles 1, then the epoxy paint 10 to be a resin binder mixed solution is applied to the photocatalyst particle layer 4, and then dried to be dried between the photocatalyst particles 1 and the photocatalyst particles 1. This is a method for supporting the photocatalyst particles 1 in which the photocatalyst particles 1 are adhered between the base material 6 and the base material 6 with the epoxy paint 10.

According to the above configuration, the epoxy resin 12 is used as a resin binder to form a photocatalyst particle layer 4 in which a contact portion of titanium oxide particles 1 and a part of a contact portion between the titanium oxide particles 1 and the base material 6 are adhered to each other. However, when the epoxy paint 10 is dried, the adsorbed water 13 adsorbed in the photocatalyst particles 1 is also dried to form pores in the epoxy resin 12, and a gap is formed between the photocatalyst particles 1 and the epoxy resin 12. It has the effect of supporting the titanium oxide particles 1 on the base material 6 by minimizing the catalytic poisoning caused by the epoxy resin 12.

Although an epoxy resin is used as the resin binder, any resin coating material such as urethane resin, acrylic resin, polysiloxane resin, and fluororesin may be used instead of the epoxy resin, and there is a difference in the action and effect. Does not occur.

(Example 7) In FIGS. 15 and 16, the photocatalyst particles 1 are made of a water-soluble resin having a resin solid content of 2.5 to 25% by weight, preferably 2.5 to 15% by weight, based on the titanium oxide particles 1. It is dispersed with polyvinyl alcohol mixed water 14 which is a mixed water, coated on the base material 6 and dried to form a photocatalyst particle layer 4, and further, an epoxy paint 10 which is a resin binder mixed solution is applied to the photocatalyst particle layer 4 as a photocatalyst. Photocatalyst particles 1 for which 5 to 50% by weight, preferably 5 to 20% by weight of resin solid content is applied to titanium oxide particles 1 forming the particle layer 4 and then dried, and then polyvinyl alcohol 15 which is a water-soluble resin is washed and removed. It becomes the carrying method of.

According to the above configuration, the water content of the polyvinyl alcohol mixed water 14 is first dried, and the contact portion of the titanium oxide particles 1 and a part of the contact portion between the titanium oxide particles 1 and the base material 6 are formed with the polyvinyl alcohol 15. The bonded photocatalyst particle layer 4 is formed, and the epoxy paint 10 is further applied to the photocatalyst particle layer 4, and the epoxy resin 12 dried thereof enhances the carrying strength of the photocatalyst particle layer 4, but the photocatalyst particles 1 have already been formed. Since a part of the titanium oxide is adhered with the polypyridinyl alcohol 15, even if the epoxy paint 10 is immersed between the titanium oxide particles 1, the photocatalyst particle layer 4 does not re-dissociate due to swelling, and the titanium oxide particles The titanium oxide particles 1 are supported on the base material 6 while maintaining the space created by 1, and a small amount of the contact portion between the titanium oxide particles 1 and the contact portion between the titanium oxide particles 1 and the base material 6 is provided. It can be adhered with the epoxy resin 12, has the effect of supporting the titanium oxide particles 1 on the base material 6 while minimizing the catalytic poisoning caused by the epoxy resin 12.

Although polyvinyl alcohol was used as the water-soluble resin, any water-soluble resin that solidifies when water is dried instead of polyvinyl alcohol may be used, and there is no difference in the action and effect.

(Example 8) In FIGS. 17 to 19, the photocatalyst particles 1 and isophthalonitrile 16, which is a high boiling point organic compound insoluble in water, are dispersed in the isophthalonitrile 16 in a soluble organic solvent 17. , This is applied to the base material 6 and then dried to form a photocatalyst particle layer 4, and further, a silica sol 18 which is an inorganic binder mixed solution is applied to the photocatalyst particle layer 4 and then dried. This is a method for supporting the photocatalyst particles 1 which forms the photocatalyst particle layer 4 by adhering between the base material 6 and the base material 6 with silica gel 19 which is an inorganic binder.

According to the above configuration, first, the photocatalyst particles 1 and the isophthalonitrile 16 are dispersed in the organic solvent 17, and this is applied to the base material 6, then the organic solvent 17 is dried, and the iso in the pores of the photocatalyst particles 1. The photocatalyst particle layer 4 is formed by retaining the phthalonitrile 16, and the photocatalyst particle layer 4 is coated with the silica sol 18 and then dried. The silica sol 18 permeates the space created between the titanium oxide particles 1, and then the silica sol 18 is permeated. Is gelled to obtain silica gel 19, the contact portion between the titanium oxide particles 1 and the contact portion between the titanium oxide particles 1 and the base material 6 are adhered, and the photocatalytic particle layer 4 is dried at a temperature of 150 to 400 ° C. Then, the isophthalonitrile 16 is evaporated, the titanium oxide particles 1 are supported on the base material 6 in a state where the surface of the titanium oxide particles 1 is more exposed, and the catalytic poisoning by the silica gel 19 is minimized to improve the adhesion. It has good and sufficient strength and has an action of supporting the titanium oxide particles 1 on the base material 6.

Instead of isophthalonitrile, a high boiling point organic compound having a boiling point of 150 to 250 ° C. such as aniline, quinine, and acetophenone may be used, and there is no difference in the action and effect.

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[Effect of the Invention] As is clear from the above examples, according to the present invention, it is possible to provide a method for supporting photocatalyst particles, which has an effect of exposing the photocatalyst particles and hardly impairing the activity as a photocatalyst.

Further, it is possible to provide a method for supporting photocatalyst particles capable of forming a photocatalyst particle layer having high supporting strength and durability.

Further, it is possible to provide a method for supporting photocatalyst particles, which can form a photocatalyst particle layer by a simple method of applying photocatalyst particles.

[Simple explanation of drawings]

FIG. 1 is a cross-sectional view of a photocatalytic particle layer according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of the photocatalyst particles when dispersed.

FIG. 3 is a cross-sectional view of the photocatalyst layer after formation.

FIG. 4 is a cross-sectional view of the photocatalyst particle layer after coating with a binder mixture solution.

FIG. 5 is a cross-sectional view of the photocatalytic particles of Example 2 of the present invention when dispersed in a binder mixture solution.

FIG. 6 is a cross-sectional view of the photocatalyst particle layer after formation.

FIG. 7 is a cross-sectional view of the same binder mixed solution coating.

FIG. 8 is a cross-sectional view of the photocatalyst particle layer of Example 3 of the present invention after formation.

FIG. 9 is a cross-sectional view of the same binder mixed solution at the time of coating.

FIG. 10 is a cross-sectional view of the photocatalyst particle layer of Example 4 of the present invention at the time of coating.

FIG. 11 is a cross-sectional view after the formation.

FIG. 12 is a cross-sectional view of Example 5 of the present invention when the resin binder mixed solution is applied.

FIG. 13 is a cross-sectional view of the photocatalyst particle layer.

FIG. 14 is a cross-sectional view of the photocatalytic particle layer of Example 6 of the present invention.

FIG. 15 is a cross-sectional view of Example 7 of the present invention when coated with water-soluble resin mixed water.

FIG. 16 is a cross-sectional view of the photocatalyst particle layer.

FIG. 17 is a cross-sectional view of the catalyst particles of Example 8 of the present invention when dispersed.

FIG. 18 is a cross-sectional view when the inorganic binder mixed solution is applied.

FIG. 19 is a cross-sectional view of the photocatalyst particle layer.

FIG. 20 is a cross-sectional view of a conventional photocatalytic particle layer.

[Explanation of symbols]

1 Titanium oxide particles 3 Water 4 Photocatalyst particle layer 5 Binder 6 Base material 7 Binder mixed solution 8 Dispersant-containing water 10 Resin binder mixed solution 11 Salt 12 Resin binder 13 Adsorbed water 14 Water-soluble resin mixed water 15 Water-soluble resin 16 High boiling point Organic compound 17 Organic solvent 18 Inorganic binder mixed solution 19 Inorganic binder

Continuation of front page (51) Int.Cl.⁶ Identification code In-house reference number FI Technical display location C08J 9/236 B01D 53/36 ZABH