JPH09271676A - Method for carrying photo-catalyst particle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve carrying strength and durability without spoiling activity of photo-catalyst particles by bonding among the photo-catalyst particles and among the photo-catalyst particles and the base material with a binder. SOLUTION: Titanium oxide particles 1 being photo-catalyst particles has a constitution wherein the primary particles 2 are agglomerated and the titanium oxide particles 1 are calcined for making them anatase. The titanium oxide particles are dispersed with water and this is applied on a base material 6 and is dried to form a photo-catalyst particle layer 4. Then, a silica sol being a binder mixed soln. to the titanium oxide particles 4 forming the photo-catalyst particle layer 4 is applied and immersed on the photo-catalyst particle layer 4 and the silica sol is gelated among the titanium oxide particles 1 and on the contact parts among the titanium oxide particles 1 and the base material 6 to form silica gel 5. In addition, the silica gel 5 is calcined to increase the strength and to form the photo-catalyst particle layer 4. It is possible thereby to form the photo-catalyst particle layer 4 with high carrying strength and durability.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for supporting photocatalyst particles used for decomposing, purifying, detoxifying or sterilizing contaminants, odorous components, organic substances and the like.

[0002]

2. Description of the Related Art Heretofore, as a method of supporting photocatalyst particles of this type, the method described in JP-A-57-122950 has been known.

A method of supporting the photocatalyst particles will be described below with reference to FIG. As shown in the figure, after applying the water glass 103 on the base material 102, the water glass 103
To be dried. Further dried water glass 103
The photocatalyst particles 101 are uniformly dispersed and adhered onto the
After baking at 0 ° C. for 30 minutes, the photocatalyst particles 101 are water glass 10
3 is adhered to the surface of the base material 102 to form a photocatalyst particle layer, and the base material 102 carries the photocatalyst particles.

[0004]

In such a conventional method for supporting photocatalyst particles, since the photocatalyst particles are buried in water glass and the surface of the photocatalyst particles is covered, the photocatalyst particles are exposed to light,
Further, since contaminants, odorous components, organic substances, etc. 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 them.

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 carrying strength and durability are low. Is required to be high.

The present invention is to solve such a conventional problem, and in a method for supporting photocatalyst particles, a photocatalyst capable of enhancing the carrying strength and durability without impairing the activity as the photocatalyst particles. It is an object to provide a method for supporting particles.

[0007]

In order to achieve the above-mentioned object, the method for supporting photocatalyst particles of the present invention forms a photocatalyst particle layer by coating the substrate with a dispersion of photocatalyst particles in water and drying. This is a method of supporting photocatalyst particles in which a binder mixed solution is applied to the photocatalyst particle layer and then dried to bond the photocatalyst particles and the photocatalyst particles and the base material with a binder.

According to the present invention, a method for supporting photocatalyst particles can be obtained which exposes the photocatalyst particles and does not impair the activity as a photocatalyst, and which forms a photocatalyst particle layer having high carrying strength and durability.

Another means is to apply a mixture of photocatalyst particles in a binder mixed solution to a substrate and then dry it to form a photocatalyst particle layer. , 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, first, the photocatalyst particles are adhered to each other and the photocatalyst particles and the base material are adhered to each other with the binder. Therefore, even if the binder mixed solution is newly applied, the photocatalyst particles are once formed. Since the layer does not decompose and the photocatalyst particles are carried by a small amount of binder, the photocatalyst particles are exposed and the activity as a photocatalyst is not impaired,
Further, a method of supporting photocatalyst particles for forming a photocatalyst particle layer having high carrying strength and durability can be obtained.

Another means is to apply the binder mixed solution to the photocatalyst particle layer and dry it a plurality of times to bond the photocatalyst particles and between the photocatalyst particles and the substrate with a small amount of binder. The supporting method is as follows.

According to the present invention, a method for supporting photocatalyst particles can be obtained which exposes the photocatalyst particles and does not impair the activity as a photocatalyst, and which forms a photocatalyst particle layer having high carrying strength and durability.

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

According to the present invention, the photocatalyst particles are further finely dispersed so that the binder mixed solution easily penetrates into the details of the photocatalyst particle layer, and the photocatalyst particle forming the photocatalyst particle layer having high carrying strength and durability is carried. A method is obtained.

As another means, a photocatalyst particle and a water-soluble salt dispersed in water are applied to a substrate 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 of supporting photocatalyst particles in which residual salt is washed off with water after post-drying.

According to the present invention, there is provided a method for supporting photocatalyst particles which exposes photocatalyst particles and forms a photocatalyst particle layer which does not impair the activity as a photocatalyst.

Another means is to coat the substrate with a dispersion of photocatalyst particles in water and then dry it to form a photocatalyst particle layer,
Water is applied to the photocatalyst particle layer to adsorb the adsorbed water in the pores of the photocatalyst particle, and then the resin binder mixed solution is applied to the photocatalyst particle layer and then dried to allow the photocatalyst particles to be mixed with each other and between the photocatalyst particles and the substrate. Is a method for supporting photocatalyst particles, which is adhered with a resin binder.

According to the present invention, the water adsorbed in the pores of the photocatalyst particles is evaporated during the drying after the application of the resin binder mixed solution, and voids are generated in the resin binder to expose the photocatalyst particles, thereby forming a photocatalyst. A method of supporting photocatalyst particles for forming a photocatalyst particle layer that does not impair activity can be obtained.

Another means is to coat the base material with photocatalyst particles dispersed in water-soluble resin mixed water and then dry to form a photocatalyst particle layer, and apply a resin binder mixed solution to the photocatalyst particle layer and dry it. After that, the water-soluble resin is washed and removed with water to carry the photocatalyst particles.

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

Another means is to apply a photocatalyst particle and a high-boiling point organic compound insoluble in water dispersed in an organic solvent in which the high-boiling point organic compound is soluble to a substrate and then dry it to form a photocatalyst particle layer. Formed, the inorganic binder mixed solution is applied to the photocatalyst particle layer and then dried to bond the photocatalyst particles, and between the photocatalyst particles and the base material with the inorganic binder to form a photocatalyst particle layer. It is a thing.

According to the present invention, the photocatalyst particles are formed by evaporating the high-boiling organic compound to expose the photocatalyst particles when the inorganic binder mixed solution is dried and form the photocatalyst particle layer that does not impair the activity as the photocatalyst. A method is obtained.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, photocatalyst particles dispersed in water are 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. Between the photocatalyst particles, and between the photocatalyst particles and the base material is a method of carrying the photocatalyst particles by bonding with a binder, the first water drying, to constitute the skeleton with only the photocatalyst particles, also during the drying Since the photocatalyst particles come close to each other due to capillary condensation of water, a photocatalyst particle layer that is densely packed as a bulk is formed, and a binder mixed solution is applied to this photocatalyst particle layer to create a space between the photocatalyst particles. By permeating the binder mixed solution and drying the binder mixed solution, only the contact portions between the photocatalyst particles and the contact portions between the photocatalyst particles and the base material are adhered to each other with this binder. The photocatalyst particles are supported on the base material while maintaining the space created by the child, and the contact parts between the photocatalyst particles and the contact parts between the photocatalyst particles and the base material can be bonded with a small amount of binder, and the catalyst by the binder can be used. It has a function of supporting the photocatalyst particles on the substrate while minimizing poisons.

Further, the photocatalyst particles are finely dispersed in water containing a dispersant and applied to a substrate and then dried to form a photocatalyst particle layer. The photocatalyst particle layer is coated with a binder mixed solution and dried. In this method, photocatalyst particles, which are aggregates of primary particles, are finely dispersed with a dispersant,
Form a uniform and densely packed photocatalyst particle layer, penetrate the binder mixed solution into the details of the space created between the photocatalyst particles, and because the photocatalyst particles are fine, the contact parts between the photocatalyst particles and the photocatalyst particles Since there are many contact points between the base materials, the contact points between the photocatalyst particles and the contact points between the photocatalyst particles and the base material can be bonded with a small amount of binder, and the catalyst poison due to the binder can be minimized to make the base of the photocatalyst particles. It can be supported on a material.

Further, a dispersion of photocatalyst particles and a water-soluble salt in water is applied to a substrate 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 for supporting the photocatalyst particles by washing and removing the remaining salt with water is performed. After the photocatalyst particle layer is formed with a resin binder, in order to remove the salt adhering to the photocatalyst particles, between the photocatalyst particles and the resin binder resin. It is possible to support the photocatalyst particles on the base material by creating a space, preventing the binder from covering the entire photocatalyst particles, and minimizing the catalyst poison due to the resin binder.

[0026]

【Example】

(Example 1) As shown in FIGS. 1 to 4, titanium oxide particles 1 which are photocatalyst particles have a structure in which primary particles 2 of approximately Φ10 to 30 nm are aggregated, and titanium oxide particles 1 are anatase-converted. Therefore, it is baked 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., and the photocatalyst particle layer 4 is formed.
To form The silica solid content of the titanium oxide particles 1 forming the photocatalyst particle layer 4 is 5 on the photocatalyst particle layer 4.
˜50 wt%, preferably 5-30 wt% silica sol 7 which is a binder mixed solution is applied and dipped, then 20-
Silica gel 7 which is dried at 200 ° C. and dried between the titanium oxide particles 1 and on the contact points between the titanium oxide particles 1 and the base material 6 to gel the silica sol and serve as a binder.
Further, the silica gel 5 is further sintered at 200 to 500 ° C. to increase the strength and form the photocatalyst particle layer 4.

With the above structure, the skeleton is composed only of the titanium oxide particles 1 when the water 3 is first dried, and the titanium oxide particles 1 are brought closer to each other by the capillary condensation of the water 3 during the drying, so that the titanium oxide particles 1 are finely packed as a bulk. To form a photocatalyst particle layer 4 filled in, and further apply silica sol 7 to this photocatalyst particle layer 4, and at this time, since it is not necessary to disperse titanium oxide particles 1, a small amount of silica sol 7 can be applied. The silica sol 7 is permeated into the space formed between the titanium oxide particles 1 and the silica sol 7 is dried to obtain a contact point between the titanium oxide particles 1 and a contact point between the titanium oxide particles 1 and the base material 6. Titanium oxide particles 1 are carried on a base material 6 in a state in which only the portions are adhered and the space formed by the titanium oxide particles 1 is retained. The contact portion between the child 1 and the base material 6 can be adhered with a small amount of silica gel 5, and the catalyst poison due to the silica gel 5 covering the titanium oxide particles 1 is minimized to provide good adhesion and sufficient strength of titanium oxide. Particle 1 to substrate 6
It has the effect of being loaded on.

In the examples, the anatase-modified titanium oxide particles were used as the photocatalyst particles, but hydrous titanium oxide or rutile-modified titanium oxide particles may be used instead of the titanium oxide particles, and the surface of Titanium oxide particles supporting a catalytic metal such as platinum, ruthenium, or palladium may be used, and any particles having a photocatalytic effect may be used, and there is no difference in their action and effect.

Further, the binder is silica gel obtained by gelling silica sol, but the binder is water glass, hydroxide diatom, alumina sol, titania sol, zirconia sol,
Alternatively, a sol obtained by hydrolyzing tetraalkoxysilane may be used, and an epoxy resin is used as a binder, but a urethane resin, an acrylic resin, a polysiloxane resin, a fluororesin, or the like resin paint may be used instead of the epoxy resin. Any may be used.

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

It is also possible to apply a primer 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.

(Embodiment 2) FIGS. 5 to 7 show that the titanium oxide particles 1 to the titanium oxide particles 1 are 2.5 to 5 in terms of silica solid content.
25 wt%, preferably 2.5 to 15 wt% of silica sol 7 is dispersed, coated on the substrate 6 and dried to form the photocatalyst particle layer 4, and the photocatalyst particle layer 4 is further formed on the photocatalyst particle layer 4. 2.5 to 25% by weight, preferably 2.5 to 15% by weight in terms of silica solid content based on the titanium oxide particles 1 forming
Of silica sol 7 and then dried to obtain the photocatalyst particles 1
This is a method of supporting the titanium oxide particles 1 in which the space and the space between the photocatalyst particles 1 and the base material 6 are adhered with silica gel 5.

With the above structure, 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 closely packed as a bulk in order to bring the titanium oxide particles 1 closer by capillary condensation of the water 3 during drying. A photocatalyst particle layer 4 and a silica sol 7 dried silica gel 5,
Contact part of titanium oxide particles 1 and titanium oxide particles 1
The photocatalyst particle layer 4 is formed by adhering a part of the contact point between the base material 6 and the base material 6, silica sol 7 is further applied to the photocatalyst particle layer 4, and the photocatalyst particle layer 4 is coated with the dried silica gel 5. Photocatalyst particles have already been added to enhance the loading strength.
Since a part of each is adhered by the silica gel 5, even if the silica sol 7 is dipped between the titanium oxide particles 1, the photocatalyst particle layer 4 is not re-dissociated by the swelling, and the titanium oxide particles 1 are formed. Titanium oxide particles 1 are supported on the base material 6 while maintaining the space, and the contact points between the titanium oxide particles 1 and the contact points between the titanium oxide particles 1 and the base material 6 are bonded with a small amount of silica gel 5. Therefore, the catalyst poison by the silica gel 5 can be minimized, and the titanium oxide particles 1 can be supported on the substrate 6 with good adhesion and sufficient strength.

Example 3 FIGS. 8 and 9 show that the solid content of silica is 2.5 to 25% by weight, preferably 2.5, based on the titanium oxide particles 1 forming the photocatalyst particle layer 4 on the photocatalyst particle layer 4. This is a method of supporting the titanium oxide particles 1 in which the silica sol 7 of about 15% by weight is applied and dried a plurality of times to bond the photocatalyst particles 1 and the photocatalyst particles 1 and the base material 6 with the silica gel 5.

With the above structure, the photocatalyst particle layer 4 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 with the silica gel 5 obtained by drying the silica sol 7. Is further formed, and the silica sol 7 is further applied to the photocatalyst particle layer 4, and the supporting strength of the photocatalyst particle layer 4 is enhanced with the dried silica gel 5 to immerse the silica sol 7 between the photocatalyst particles 1. Even if it is dried and gelled, the amount of silica in the silica sol 7 applied in one operation is small.
The photocatalyst particle layer 4 hardly re-dissociates due to volumetric contraction when the silica gels on the silica gel 5, and the titanium oxide particles 1 are supported on the base material 6 while maintaining the space formed by the titanium oxide particles 1. However, the contact points between the titanium oxide particles 1 and the contact points between the titanium oxide particles 1 and the base material 6 can be adhered with a small amount of silica gel 5, and the catalyst poison due to the silica gel 5 can be minimized to improve the adhesion. It has a sufficient strength to support the titanium oxide particles 1 on the base material 6.

Example 4 In FIGS. 10 and 11, the photocatalyst particles 1 are finely dispersed in water 8 containing a dispersant, and the photocatalyst particles 1 are applied to a substrate 6 and dried to form a photocatalyst particle layer 4. A method for supporting titanium oxide particles 1 in which the 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. Becomes

With the above structure, 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. At this time, since the titanium oxide particles 1 come close to each other due to the capillary condensation of water during drying, the photocatalyst particle layer 4 more densely packed as a bulk is formed. The contact portions between the particles 1 and the contact portions between the titanium oxide particles 1 and the substrate 6 are increased, and the silica sol 7 is added to the photocatalyst particle layer 4.
The silica sol 7 is permeated into the space formed between the titanium oxide particles 1 by coating the silica sol 7 and the silica sol 7 is dried to increase the contact points between the titanium oxide particles 1 and the titanium oxide particles 1 and the base material. The titanium oxide particles 1 are carried on the base material 6 while the space between the titanium oxide particles 1 is adhered, and the space formed by the titanium oxide particles 1 is held. The contact portion between the particles 1 and the base material 6 can be adhered with a small amount of silica gel 5, the catalyst poison by the silica gel 5 is minimized, and the adhesion is good and the strength is sufficient. It has the function of supporting.

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

(Example 5) In FIGS. 12 and 13, the photocatalyst particles 1 and the water-soluble salt 11 are dispersed in water, and this is coated on the substrate 6 and dried to form the photocatalyst particle layer 4. Further, the epoxy coating 10 as a resin binder mixed solution is added to the photocatalyst particle layer 4 in an amount of 5 to 50% by weight, preferably 5 to 5% by weight of resin solid content based on the titanium oxide particles 1 forming the photocatalyst particle layer 4.
After applying 20% by weight and drying, the remaining salt 11 is washed and removed by a method of supporting the photocatalyst particles 1.

With the above structure, the photocatalyst particle layer 4 is formed from the titanium oxide particles 1 by the first drying of the water 3, the salt 11 is attached to the titanium oxide particles 1, and the photocatalyst particle layer 4 is further attached. The epoxy paint 10 is applied to penetrate the space formed between the titanium oxide particles 1 into the epoxy paint 10,
Only the contact points between the titanium oxide particles 1 and the contact points between the titanium oxide particles 1 and the base material 6 are adhered with the epoxy resin 12 which is a resin binder obtained by drying the epoxy paint 10. The titanium oxide particles 1 are supported on the base material 6 while maintaining the created space, and thereafter,
The salt 11 adhering to the titanium oxide particles 1 is removed by washing the photocatalyst particle layer 4 with water to form a gap between the titanium oxide particles 1 and the epoxy resin 12, and the epoxy resin 1
It has an effect of supporting the titanium oxide particles 1 on the base material 6 while minimizing the catalyst poison due to 2.

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

Example 6 In FIG. 14, the photocatalyst particles 1 are dispersed in water 3, and the photocatalyst particle layer 4 is formed by coating the base material 6 on the base material 6 and drying it. Is applied to adsorb the adsorbed water 13 in the pores of the photocatalyst particles 1, and then the epoxy catalyst 10 which is a resin binder mixed solution is applied to the photocatalyst particle layer 4 and then dried to allow a space between the photocatalyst particles 1 and between the photocatalyst particles 1. This is a method of supporting the photocatalyst particles 1 in which the epoxy paint 10 adheres between the base material 6 and the base material 6.

With the above structure, the photocatalyst particle layer 4 is formed by bonding the contact portion of the titanium oxide particles 1 and a portion of the contact portion between the titanium oxide particles 1 and the base material 6 with the epoxy resin 12 as the resin binder. Yes, epoxy paint 10
When water is dried, the adsorbed water 1 adsorbed in the photocatalyst particles 1
3 is also dried, pores are formed in the epoxy resin 12, and a gap is created between the photocatalyst particles 1 and the epoxy resin 12,
It has a function of supporting the titanium oxide particles 1 on the base material 6 while minimizing the catalyst poison due to the epoxy resin 12.

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

(Example 7) FIGS. 15 and 16 show that the photocatalyst particles 1 are in a resin solid content of 2.5 with respect to the titanium oxide particles 1.
˜25% by weight, preferably 2.5 to 15% by weight of water-soluble resin mixed water, which is polyvinyl alcohol mixed water 14, is dispersed on the substrate 6 and dried to form the photocatalyst particle layer 4. Further, the epoxy paint 10 as a resin binder mixed solution is applied to the photocatalyst particle layer 4 in a resin solid content of 5 to 50% by weight, preferably 5 to 20% by weight with respect to the titanium oxide particles 1 forming the photocatalyst particle layer 4, and then dried. After that, the method for supporting the photocatalyst particles 1 in which the polyvinyl alcohol 15 which is the water-soluble resin is removed by washing with water.

With the above-described structure, first, the water content of the polyvinyl alcohol mixed water 14 is dried, and the polyvinyl alcohol 15 is used to remove 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. The adhered photocatalyst particle layer 4 is formed, epoxy coating 10 is further applied to the photocatalyst particle layer 4, and the dried epoxy resin 12 enhances the carrying strength of the photocatalyst particle layer 4. Part of polypyrivinyl alcohol 1
Since the titanium oxide particles 1 are adhered to each other, the photocatalyst particle layer 4 is not redissolved by swelling even when the epoxy paint 10 is dipped between the titanium oxide particles 1, and the space formed by the titanium oxide particles 1 is retained. In this state, the titanium oxide particles 1 are carried on the base material 6, and the contact points between the titanium oxide particles 1 and the contact points between the titanium oxide particles 1 and the base material 6 can be bonded with a small amount of epoxy resin 12. It has the function of supporting the titanium oxide particles 1 on the base material 6 while minimizing the catalyst poison due to the resin 12.

Although polyvinyl alcohol was used as the water-soluble resin, any water-soluble resin that solidifies when dried in place of polyvinyl alcohol may be used without causing a difference in its action and effect.

Example 8 FIGS. 17 to 19 show photocatalyst particles 1 and isophthalonitrile 16 which is a water-insoluble high boiling point organic compound dispersed in an organic solvent 17 in which the isophthalonitrile 16 is soluble. Then, this is applied to the base material 6 and dried to form the photocatalyst particle layer 4, and the photocatalyst particle layer 4 is further coated and dried with silica sol 18, which is an inorganic binder mixed solution. This is a method of supporting the photocatalyst particles 1 in which the photocatalyst particle layer 4 is formed by bonding the space between the base material 6 and the base material 6 with silica gel 19 which is an inorganic binder.

With the above structure, the photocatalyst particles 1 and the isophthalonitrile 16 are first dispersed in the organic solvent 17, the organic solvent 17 is dried on the substrate 6, and the photocatalyst particles 1 are then dried.
The photocatalyst particle layer 4 is formed by holding the isophthalonitrile 16 in the pores of the silica gel, and the silica sol 18 is applied to the photocatalyst particle layer 4 and then dried to form the silica sol 18 in the space formed between the titanium oxide particles 1. After permeation, this silica sol 18
Is gelled to form silica gel 19, the contact points between the titanium oxide particles 1 and the contact points between the titanium oxide particles 1 and the substrate 6 are adhered, and the photocatalyst particle layer 4 is dried at a temperature of 150 to 400 ° C. Then, the isophthalonitrile 16 is evaporated, and the titanium oxide particles 1 are supported on the substrate 6 with the surface of the titanium oxide particles 1 being more exposed, and the catalyst poison due to the silica gel 19 is minimized to improve the adhesion. It has good and sufficient strength, and has an effect of supporting the titanium oxide particles 1 on the base material 6.

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

[0051]

As is apparent from the above examples, according to the present invention, it is possible to provide a method for supporting photocatalyst particles, which is effective in exposing the photocatalyst particles and not 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 of supporting photocatalyst particles which can form a photocatalyst particle layer by a simple method of coating photocatalyst particles.

[Brief description of drawings]

FIG. 1 is a sectional view of a photocatalyst particle layer of Example 1 of the present invention.

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

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

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

FIG. 5 is a sectional view of a photocatalyst particle of Example 2 of the present invention when a binder mixed solution is dispersed.

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

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

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

FIG. 9 is a sectional view of the same binder mixed solution coating.

FIG. 10 is a sectional view of the photocatalyst particle layer of Example 4 of the present invention during coating.

FIG. 11 is a sectional view after the formation.

FIG. 12 is a cross-sectional view at the time of applying a resin binder mixed solution of Example 5 of the present invention.

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

FIG. 14 is a sectional view of a photocatalyst particle layer of Example 6 of the present invention.

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

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

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

FIG. 18 is a sectional view of the same inorganic binder mixed solution applied.

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

FIG. 20 is a sectional view of a conventional photocatalyst 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 the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location C08J 9/236 B01D 53/36 ZABH

Claims (8)

[Claims] 1. 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 to form a space between the photocatalyst particles and the photocatalyst particles. A method for supporting photocatalyst particles, which comprises bonding the photocatalyst particles and the base material with a binder. 2. A photocatalyst particle layer is formed by applying a dispersion of photocatalyst particles in a binder mixed solution onto a substrate and then drying to form a photocatalyst particle layer,
The method for supporting photocatalyst particles according to claim 1, wherein a binder mixed solution is applied to the photocatalyst particle layer and then dried, and the photocatalyst particles are adhered to each other and the photocatalyst particles and the base material are adhered to each other with a binder. 3. The photocatalyst particle layer is coated with a binder mixed solution and dried a plurality of times to bond the photocatalyst particles and the photocatalyst particles to the base material with a binder. A method for supporting photocatalyst particles. 4. A method in which photocatalyst particles are finely dispersed in water containing a dispersant and 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. 3. The method for supporting photocatalyst particles according to item 3. 5. A photocatalyst particle layer is formed by applying a dispersion of photocatalyst particles and a water-soluble salt in water on a base material and drying the base material to form a photocatalyst particle layer.
The method for supporting photocatalyst particles according to claim 1 or 4, wherein the resin binder mixed solution is applied to the photocatalyst particle layer and dried, and then the remaining salt is washed and removed. 6. A photocatalyst particle dispersed in water is applied to a substrate and then dried to form a photocatalyst particle layer, and water is applied to the photocatalyst particle layer to adsorb adsorbed water in the pores of the photocatalyst particle. The method for supporting photocatalyst particles according to claim 1, wherein the photocatalyst particle layer is coated with a resin binder mixed solution and then dried, and the photocatalyst particles and the photocatalyst particles and the base material are adhered with a resin binder. 7. A photocatalyst particle layer is formed by applying a dispersion of photocatalyst particles in a water-soluble resin-mixed water on a substrate and then drying to form a photocatalyst particle layer,
The water-soluble resin is washed off with water after the resin binder mixed solution is applied to the photocatalyst particle layer and dried.
5. The method for supporting photocatalyst particles according to 5 or 6. 8. A photocatalyst particle layer is formed by applying photocatalyst particles and a water-insoluble high-boiling organic compound dispersed in an organic solvent in which the high-boiling organic compound is soluble onto a substrate and then drying it to form a photocatalyst particle layer.
The photocatalyst particle layer according to claim 1, wherein the photocatalyst particle layer is applied with an inorganic binder mixed solution and then dried, and the photocatalyst particles and the photocatalyst particles and the substrate are adhered with an inorganic binder to form a photocatalyst particle layer. Method of supporting.