Method for carrying titanium dioxide particle

Description: TECHNICAL FIELD [Detailed description of the invention]

【0001】

[Industrial application field]

The present invention relates to a method for supporting titanium dioxide particles that form a photocatalytic layer that decomposes, purifies, detoxifies, or sterilizes dirty substances, odorous components, organic substances, and the like.

【0002】

[Conventional technology]

In recent years, as the use and application range of titanium dioxide particles have expanded, it is required that titanium dioxide particles have durability and workability on the surface of any base material without impairing the activity as a photocatalyst.

【0003】

Conventionally, a method for supporting titanium dioxide particles for forming this type of photocatalyst layer has generally been configured as shown in JP-A-57-122950. Hereinafter, the configuration will be described with reference to FIG.

【0004】

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, a method of carrying the titanium dioxide particles to form a photocatalyst layer by uniformly dispersing and adhering the titanium dioxide particles 101 on the freshly dried water glass 103 and firing at 300 ° C. for 30 minutes was common.

【0005】

In the above configuration, the titanium dioxide particles 101 are adhered and coated on the surface of the base material 102 via the water glass 103, and when an organic substance, which is a stain component, adheres to the surface of the titanium dioxide particles, it emits near-ultraviolet light having a wavelength of 300 to 400 nm. Upon irradiation, the titanium dioxide particles 101 are excited to decompose and purify organic substances that are dirt components.

【0006】

[Problems to be Solved by the Invention]

In the conventional method of supporting titanium dioxide particles forming a photocatalyst layer, if the water glass 103 is not sufficiently dried even if sufficient care is taken, the water glass is subjected to the uniform adhesion step of the titanium dioxide particles 101. There was a problem that the titanium dioxide particles 101 were buried in 103, and the activity of the portion as a photocatalyst was impaired.

【0007】

Further, if the water glass 103 is dried too much, the titanium dioxide particles 101 are not adhered to the water glass 103, so that there is a problem that only a photocatalyst layer having low strength can be formed.

【0008】

Further, there is a problem that the coating process becomes a complicated work of two steps, that is, coating and drying control of water glass 103, and subsequent uniform adhesion and firing of titanium dioxide particles 101.

【0009】

Further, when water glass 103 is used as the inorganic binder, there is a problem that it cannot be practically used for the base material 102 whose mating material is a corrosive material such as aluminum.

【0010】

The present invention solves the above problems, and a first object of the present invention is to provide a method for supporting titanium dioxide particles capable of forming a photocatalyst layer without impairing the activity as a photocatalyst.

【0011】

A second object is to provide a method for supporting titanium dioxide particles, which can firmly hold the titanium dioxide particles to the substrate via a binder and form a photocatalyst layer having high strength.

【0012】

A third object is to provide a method for supporting titanium dioxide particles capable of forming a photocatalytic layer by a simple method of dispersing and coating titanium dioxide particles.

【0013】

A fourth object is to provide a method for supporting titanium dioxide particles capable of forming a photocatalytic layer without corroding a substrate.

【0014】

[Means for solving problems]

In order to achieve the first to fourth objects described above in the method for supporting titanium dioxide particles forming the photocatalytic layer of the present invention, the first means is to impregnate the titanium dioxide particles with water and base the titanium dioxide particles together with the solvent-based paint. The material is coated and heated to form a photocatalyst layer and supported.

【0015】

In addition, the second means for achieving the first to third purposes is to impregnate titanium dioxide particles with an organic solvent, apply and heat the substrate together with an inorganic binder to form and support a photocatalyst layer. The configuration is made up of.

【0016】

In addition, as a third means for achieving the first to third purposes, titanium dioxide particles are applied and heated on a substrate together with a sublimable organic compound and an inorganic binder to form and support a photocatalyst layer. The configuration is made up of.

【0017】

In addition, the fourth means for achieving the first to fourth objectives is to apply and heat titanium dioxide particles to a base material together with a polysiloxane resin containing a curing agent, and after film formation, further heat the photocatalyst layer. Is formed and supported.

【0018】

In addition, the fifth means for achieving the first, second, and fourth purposes is to apply titanium dioxide particles to a base material, cover it with a transparent microporous film, and form and support a photocatalyst layer. The configuration is as follows.

【0019】

In addition, the sixth means for achieving the first, second, and fourth purposes is to apply titanium dioxide particles to the mirror-treated surface of the mirror-processed base material to form and support a photocatalyst layer. The configuration is made up of.

【0020】

In addition, the seventh means for achieving the first and second purposes is to place titanium dioxide particles in a high-speed air flow to form and support a sprayed photocatalyst layer on the surface of the heated thermoplastic resin. The configuration is as follows.

【0021】

[Action]

According to the above-mentioned configuration of the first means, the present invention can form a photocatalyst layer having sufficient strength without impairing the activity as a photocatalyst, and the titanium dioxide particles can be made into a paint and painted. The photocatalyst layer can be formed by any method, and further, since a solvent-based paint is used, the photocatalyst layer can be formed without corroding a base material such as aluminum.

【0022】

Further, by the configuration of the second means, it is possible to form a photocatalyst layer having sufficient strength without impairing the activity as a photocatalyst, and the titanium dioxide particles are made into a paint and painted by a simple method. A photocatalytic layer can be formed.

【0023】

Further, by the configuration of the third means, it is possible to form a photocatalyst layer having sufficient strength without impairing the activity as a photocatalyst, and the titanium dioxide particles are made into a paint and painted by a simple method. A photocatalytic layer can be formed.

【0024】

Further, by the configuration of the fourth means, it is possible to form a photocatalyst layer having sufficient strength without impairing the activity as a photocatalyst, and the titanium dioxide particles are made into a paint and painted by a simple method. Since the photocatalyst layer can be formed and the polysiloxane resin is used, the photocatalyst layer can be formed without corroding the base material such as aluminum.

【0025】

Further, by the configuration of the fifth means, it is possible to form a photocatalyst layer having sufficient strength without impairing the activity as a photocatalyst, and further, since a polysiloxane resin is used, a base material such as aluminum is used. The photocatalyst layer can be formed without corroding.

【0026】

Further, by the configuration of the sixth means, the activity as a photocatalyst can be enhanced, a photocatalyst layer having sufficient strength can be formed, and a photocatalyst layer can be formed without corroding a base material such as aluminum. be able to.

【0027】

Further, by the configuration of the seventh means, it is possible to form a photocatalyst layer having sufficient strength without impairing the activity as a photocatalyst.

【0028】

[Example]

Hereinafter, the first embodiment of the present invention will be described with reference to FIGS. 1 to 3.

【0029】

As shown in the figure, the titanium dioxide particles 1 have a structure in which primary particles 2 having a diameter of about Φ10 to 30 nm are aggregated, and the titanium dioxide particles 1 are calcined at 500 to 800 ° C for anatase formation. Then, the titanium dioxide particles 1 are impregnated with water 3, and water 3 is filled between the primary particles 2. Further, in the method of supporting the titanium dioxide particles forming the photocatalyst layer 4, the titanium dioxide particles 1 are impregnated with water 3, dispersed in a solvent-based paint 24 containing an epoxy resin 5, and then coated on the base material 6. Then, it is first dried at 30 to 50 ° C. to evaporate thinner, and then secondarily dried at 160 to 200 ° C. to form the photocatalyst layer 4.

【0030】

According to the above configuration, when the water 3 evaporates during the secondary drying, pores A7 are formed in the epoxy resin 5 serving as a binder, so that a part of the surface of the titanium dioxide particles 1 is not covered with the epoxy resin 5. Since it is exposed, there is little decrease in activity as a photocatalyst when irradiated with near-ultraviolet light 21 having a wavelength of 300 to 400 nm. Further, the titanium dioxide particles 1 are held by the epoxy resin 5, and the photocatalyst layer 4 has good adhesion and can have sufficient strength.

【0031】

Further, since the titanium dioxide particles 1 are dispersed in the solvent-based paint 24 to form a paint, the photocatalyst layer can be formed by a simple method of painting. Further, since the solvent-based paint 24 is used, a base material such as aluminum is used. A photocatalyst layer can be formed without corroding 6.

【0032】

As described above, according to the method for supporting titanium dioxide particles of the first embodiment of the present invention, a photocatalyst layer having sufficient strength can be formed without impairing the activity as a photocatalyst, and titanium dioxide can be formed. The photocatalyst layer can be formed by converting the particles into a paint and forming a photocatalyst layer by a simple method of painting. Further, since a solvent-based paint is used, the photocatalyst layer can be formed without corroding a base material such as aluminum.

【0033】

As the titanium dioxide particles, anatase-ized titanium dioxide particles have been described, but titanium hydroxide-containing titanium dioxide or rutyled titanium dioxide particles may be used, and platinum, ruthenium, palladium, rhodium, tantalum, silver, nickel, etc. may be used on the surface. Titanium dioxide particles carrying catalytic metals such as copper, zirconium, chromium, vanadium, iron oxide, tin oxide, manganese oxide, nickel oxide, ruthenium oxide, etc. may be used, and niobium, tantalum, tungsten, antimony, zirconium, chromium, vanadium. , Titanium dioxide particles may be doped with a donor metal such as molybdenum, or a part or all of the titanium dioxide particles may be sulfurized, and there is no difference in the action and effect. Further, as the solvent-based paint, each resin paint of urethane resin, acrylic resin, polysiloxane resin, and fluororesin may be used instead of the epoxy resin, and there is no difference in the action and effect.

【0034】

Next, a second embodiment of the present invention will be described with reference to FIGS. 4 to 6. The same parts as those in the first embodiment are assigned the same numbers, and detailed description thereof will be omitted.

【0035】

As shown in the figure, the titanium dioxide particles 1 are impregnated with aniline, which is an organic solvent 8, and the organic solvent 8 is filled between the primary particles 2. Further, in the method of supporting the titanium dioxide particles forming the photocatalyst layer 4, the titanium dioxide particles 1 are impregnated with the organic solvent 8 and then dispersed in the metal alcoholate 9 solution which is the inorganic binder solution 25 to be dispersed on the base material 6. Apply. Then, it is first dried at 100 to 150 ° C. to evaporate the low boiling point solvent, and then secondarily dried at 150 to 300 ° C. to form the photocatalyst layer 4.

【0036】

According to the above configuration, when the organic solvent 8 evaporates during the secondary drying, pores B10 are formed in the metal alcoholate 9 which is a binder. Further, even when the organic component of the metal alcoholate 9 evaporates, a part of the surface of the titanium dioxide particles 1 is not covered with the metal alcoholate 9 because it forms pores C11 and is exposed, so that the wavelength is 300 to 400 nm. When irradiated with near-ultraviolet light 21, there is little decrease in activity as a photocatalyst.

【0037】

Further, the titanium dioxide particles 1 are held by the metal alcoholate 9, and the photocatalyst layer 4 has good adhesion and can have sufficient strength.

【0038】

Further, since the titanium dioxide particles 1 are dispersed in 25 in the inorganic binder solution to form a paint, the photocatalyst layer can be formed by a simple method of painting.

【0039】

In addition, the organic component of the metal alcoholate 9 decomposes and evaporates during the secondary drying, and the metal alcoholate 9 becomes silicon dioxide. Therefore, the binder does not decompose when irradiated with near-ultraviolet light 21 having a wavelength of 300 to 400 nm, and has sufficient strength. It is possible to form a photocatalyst layer having.

【0040】

As described above, according to the method for supporting titanium dioxide particles of the second embodiment of the present invention, a photocatalyst layer having sufficient strength can be formed without impairing the activity as a photocatalyst, and titanium dioxide can be formed. The particles can be made into paint to form a photocatalyst layer by a simple method of painting.

【0041】

Silica sol, alumina sol, zirconia sol, titania sol, and water glass may be used instead of the metal alcoholate which is an inorganic binder, and an organic solvent having a boiling point of 150 to 250 ° C (for example, acetophenone) may be used instead of aniline. ) May be used, and there is no difference in the action and effect.

【0042】

Next, a third embodiment of the present invention will be described with reference to FIGS. 7 and 8. The same parts as those in the second embodiment are assigned the same numbers, and detailed description thereof will be omitted.

【0043】

As shown in the figure, the method of supporting the titanium dioxide particles forming the photocatalyst layer 4 is as follows: titanium dioxide particles 1 impregnated with an organic solvent 8 and a sublimable organic compound in a solution of metal alcoholate 9 which is an inorganic binder solution 25. Isophthalonitrile (12) is dispersed and coated on the base material 6. Then, it is first dried at 100 to 150 ° C. to evaporate the low boiling point solvent, and then secondarily dried at 150 to 300 ° C. to form the photocatalyst layer 4.

【0044】

With the above configuration, when the organic solvent 8 evaporates during secondary drying, pores B10 are formed in the metal alcoholate 9 as a binder. Further, even when the sublimable organic compound 12 is sublimated, a part of the surface of the titanium dioxide particles 1 is not covered with the metal alcoholate 9 and is exposed because the pores D13 are formed in the metal alcoholate 9, so that the wavelength is increased. When irradiated with near-ultraviolet light 21 of 300 to 400 nm, there is little decrease in activity as a photocatalyst.

【0045】

As described above, according to the method for supporting the titanium dioxide particles of the third embodiment of the present invention, a part of the surface of the titanium dioxide particles having an activity as a photocatalyst is not covered with the metal alcoholate serving as a binder and is exposed. It is possible to form a high-intensity photocatalyst layer in which the binder does not decompose even when irradiated with near-ultraviolet light having a wavelength of 300 to 400 nm without impairing the activity as a photocatalyst.

【0046】

A sublimable organic compound having a boiling point of 150 to 250 ° C. (for example, quinine) may be used instead of isophthalonitrile, and there is no difference in the action and effect.

【0047】

Next, a fourth embodiment of the present invention will be described with reference to FIGS. 9 and 10. The same parts as those in the first embodiment are assigned the same numbers, and detailed description thereof will be omitted.

【0048】

As shown in the figure, in the method of supporting the titanium dioxide particles forming the photocatalyst layer 4, the titanium dioxide particles 1 are dispersed in the polysiloxane resin coating material 27 of the polysiloxane resin 14 to which the curing agent 26 is added, and the base material 6 is used. Paint on. Then, it is first dried at 80 to 200 ° C. to cure the polysiloxane resin 14, and then secondarily dried at 100 to 400 ° C. to form the photocatalyst layer 4.

【0049】

With the above configuration, when the methyl group and phenyl group in the polysiloxane resin 14 are decomposed and evaporated during secondary drying, pores E15 are formed in the polysiloxane resin 14 as a binder, so that one of the surfaces of the titanium dioxide particles 1 is formed. Since the portion is not covered with the polysiloxane resin 14 and is exposed, there is little decrease in activity as a photocatalyst when irradiated with near-ultraviolet light 21 having a wavelength of 300 to 400 nm.

【0050】

Further, during the secondary drying, the organic components of the methyl group and the phenyl group of the polysiloxane resin 14 are almost evaporated to silicon dioxide, so that when the polysiloxane resin 14 is irradiated with near-ultraviolet light 21 having a wavelength of 300 to 400 nm, the binder is generated. It does not decompose and can have sufficient strength.

【0051】

As described above, according to the method for supporting the titanium dioxide particles of the fourth embodiment of the present invention, a part of the surface of the titanium dioxide particles having an activity as a photocatalyst is not covered with the polysiloxane resin serving as a binder and is exposed. Therefore, it is possible to form a high-intensity photocatalyst layer in which the binder does not decompose even when irradiated with near-ultraviolet light having a wavelength of 300 to 400 nm without impairing the activity as a photocatalyst.

【0052】

Next, a fifth embodiment of the present invention will be described with reference to FIG. The same parts as those in the first embodiment are assigned the same numbers, and detailed description thereof will be omitted.

【0053】

As shown in the figure, the method of supporting the titanium dioxide particles forming the photocatalyst layer 4 is to disperse the titanium dioxide particles 1 in water, apply it to the base material 16 having the concave surface 17, and dry it at 40 to 150 ° C. .. Then, after removing the titanium dioxide particles 1 on the convex surface 18 of the base material 16, the adhesive 23 is applied to the convex surface 18, and the microporous surface that transmits near-ultraviolet light 21 having a wavelength of 300 to 400 nm and permeates the oil component. The membrane 19 is bonded to form the catalyst layer 4.

【0054】

With the above configuration, the titanium dioxide particles 1 held in the concave surface 17 of the base material 16 are not surrounded by a binder, and the microporous film 19 has a near-ultraviolet light 21 having a wavelength of 300 to 400 nm. When irradiated with near-ultraviolet light 21 having a wavelength of 300 to 400 nm, it is possible to reduce a decrease in activity as a photocatalyst.

【0055】

As described above, according to the method for supporting titanium dioxide particles of the fifth embodiment of the present invention, the microporous film itself is transparent and easily transmits near-ultraviolet light of 300 to 400 nm, and the activity as a photocatalyst is impaired. It is possible to form a photocatalytic layer that does not occur.

【0056】

Instead of using an adhesive, the microporous film is thermoplastic, and the microporous film may be heat-sealed to the convex portion of the base material, and there is no difference in the action and effect.

【0057】

Next, a sixth embodiment of the present invention will be described with reference to FIG. The same parts as those in the fifth embodiment are assigned the same numbers, and detailed description thereof will be omitted.

【0058】

As shown in the figure, the method of supporting the titanium dioxide particles forming the photocatalyst layer 4 is to perform mirror treatment 20 on the concave surface 17, apply titanium dioxide particles 1, and attach the microporous film 19 to form the catalyst layer 4. It is a thing.

【0059】

With the above configuration, the near-ultraviolet light 21 having a wavelength of 300 to 400 nm reaches the titanium dioxide particles 1 held in the concave surface 17 and partially passes through, but is reflected by the mirror surface treatment 20 and is again dioxide. It reaches the titanium particles 1 and can efficiently irradiate the titanium dioxide particles 1.

【0060】

As described above, according to the method for supporting titanium dioxide particles of the sixth embodiment of the present invention, it is possible to form a photocatalyst layer that effectively utilizes near-ultraviolet light having a wavelength of 300 to 400 nm and enhances the activity as a photocatalyst. ..

【0061】

Next, a seventh embodiment of the present invention will be described with reference to FIG. The same parts as those in the first embodiment are assigned the same numbers, and detailed description thereof will be omitted.

【0062】

As shown in the figure, the method of supporting the titanium dioxide particles forming the photocatalyst layer 4 is to heat a fluororesin, which is a thermoplastic resin 22 as a base material, to its softening temperature of 300 to 380 ° C. Titanium particles 1 are injected into a high-temperature air stream of 300 to 380 ° C and collide with fluororesin at high speed to form a photocatalyst layer 4.

【0063】

With the above configuration, since the fluororesin has reached the softening temperature, only the portion to which the titanium dioxide particles 1 are bonded is sunk into the fluororesin, and the titanium dioxide particles 1 are exposed on the surface, so that the titanium dioxide particles 1 can be used as a photocatalyst. Can be done without reducing the activity of.

【0064】

As described above, according to the method for supporting titanium dioxide particles according to the seventh embodiment of the present invention, a photocatalyst layer having plasticity can be formed without impairing the activity as a photocatalyst.

【0065】

In addition, vinyl chloride resin, polyester resin, and FRP may be used instead of the fluororesin which is the thermoplastic resin, and there is no difference in the action and effect.

【0066】

[Effect of the invention]

As is clear from the above examples, according to the present invention, a photocatalyst layer having sufficient strength can be formed without impairing the activity as a photocatalyst, and titanium dioxide particles are made into a paint. A photocatalyst layer can be formed by a simple method of painting, and since a solvent-based paint is used, a method of supporting titanium dioxide particles that can form a photocatalyst layer without corroding a base material such as aluminum is available. Can be provided.

[Simple explanation of drawings]

[Figure 1]

Cross-sectional view of the photocatalyst layer of the first embodiment of the present invention at the time of painting [Figure 2]

Cross-sectional view of the titanium dioxide particles [Fig. 3]

Cross-sectional view after formation of the photocatalyst layer [Fig. 4]

Cross-sectional view of the photocatalyst layer of the second embodiment at the time of painting [Fig. 5]

Cross-sectional view of the titanium dioxide particles [Fig. 6]

Cross-sectional view after formation of the photocatalyst layer [Fig. 7]

Cross-sectional view of the photocatalyst layer of the third embodiment at the time of painting [Fig. 8]

Cross-sectional view after the formation [Fig. 9]

Cross-sectional view of the photocatalyst layer of the fourth embodiment at the time of painting [Fig. 10]

Cross-sectional view after the formation [Fig. 11]

Cross-sectional view of the photocatalyst layer of the fifth embodiment [Fig. 12]

Cross-sectional view of the photocatalyst layer of the sixth embodiment [Fig. 13]

Sectional drawing of the photocatalyst layer of the 7th Example [Fig. 14]

Cross-sectional view of the conventional photocatalyst layer [Explanation of symbols]

1 Titanium dioxide particles 3 water 4 Photocatalytic layer 6 base material 8 Organic solvent 12 Sublimable organic compounds 14 Polysiloxane resin 16 Base material 19 Microporous membrane 20 Mirror surface 22 Thermoplastic resin 24 Solvent-based paint 25 Inorganic binder solution 26 Hardener