Photocatalyst and method for carrying the same

Description: TECHNICAL FIELD [Detailed description of the invention]

【0001】

[Industrial application field]

The present invention relates to a photocatalyst and a method for supporting a photocatalyst that decomposes, purifies, detoxifies, or sterilizes dirt-adhering substances, harmful substances, and the like.

【0002】

[Conventional technology]

In recent years, as the use and application range of photocatalysts have expanded, it is required that photocatalysts be supported on the surface of any object with durability and good workability without impairing the photocatalytic function.

【0003】

Conventionally, this type of photocatalyst and a method of supporting a photocatalyst have been performed by using titanium dioxide particles having photocatalytic activity as a photocatalyst, applying an inorganic binder such as water glass to the surface of an object, and further coating the photocatalyst on the surface of the object. A method in which a powder of titanium dioxide particles is surface-coated by spraying or the like and then supported by drying or sintering is common.

【0004】

In the above configuration, the photocatalytic titanium dioxide particles having photocatalytic activity are adhered to and coated on the surface of the object via an inorganic binder. When organic matter, which is a stain component, adheres to the surface of the photocatalyst, when it is irradiated with near-ultraviolet light having a wavelength of 300 to 400 nm, titanium dioxide, which has photocatalytic activity, which is a photocatalyst, is excited to decompose and purify the organic matter, which is a stain component. Will be done.

【0005】

[Problems to be Solved by the Invention]

In such a conventional method of supporting a photocatalyst and a photocatalyst, when water glass is used as an inorganic binder, compatibility with the mating material becomes a problem, and for a painted surface or material that easily repels water. There is a problem that it cannot be used practically. In addition, the spraying process is a two-step process of spraying an inorganic binder and then spraying the photocatalyst, and even with sufficient care, the inorganic binder is applied to the surface of the photocatalyst during the spraying of the photocatalyst. There is a problem that titanium dioxide particles having photocatalytic activity, which is a photocatalyst, are buried in the inorganic binder, the photocatalytic activity of that portion is impaired, and the photocatalytic active portion becomes sparse. Instead, when an organic binder is used, there is a problem that the organic binder of the photocatalyst decomposes when the photocatalyst is activated by irradiating near-ultraviolet light with a wavelength of 300 to 400 nm, and the binder does not function as a binder. ..

【0006】

The present invention solves the above problems, and a first object of the present invention is to provide a photocatalyst that can be used by an organic binder.

【0007】

The second object is to easily manufacture and provide a photocatalyst that can be used by an organic binder by constituting only titanium dioxide particles having photocatalytic activity.

【0008】

A third object is to provide a photocatalyst that can be spray-coated on any surface of an object, has durability, and can be supported with good workability without impairing photocatalytic performance.

【0009】

The fourth purpose is to decompose the organic binder to prevent the adhesion of dust and photocatalyst before the dust adheres to the organic binder on the surface and blocks or weakens the near-ultraviolet light having a wavelength of 300 to 400 nm. It is an object of the present invention to provide a method for carrying a photocatalyst that enables the function to be used.

【0010】

The fifth object is to provide a photocatalyst that allows near-ultraviolet light having a wavelength of 300 to 400 nm to reach the depths even when the surface of the object is deep when irradiated with near-ultraviolet light having a wavelength of 300 to 400 nm. There is.

【0011】

[Means for solving problems]

The first means for achieving the first object of the present invention is a structure in which titanium dioxide particles having photocatalytic activity are supported on substantially one surface of the surface of inorganic particles.

【0012】

Further, the second means for achieving the second object is a structure in which titanium dioxide particles having photocatalytic activity are aggregated and supported on each other.

【0013】

Further, the third means for achieving the third object is the configuration according to claim 1 or 2, which is a mixture of organic binders.

【0014】

The fourth means for achieving the fourth object is the configuration according to claim 3, wherein the surface of the target object is sprayed or coated with near-ultraviolet light having a wavelength of 300 to 400 nm. is there.

【0015】

The fifth means for achieving the fifth object is the configuration according to claim 3, which is formed by mixing light-reflecting particles of near-ultraviolet light having a wavelength of 300 to 400 nm.

【0016】

[Action]

In the present invention, the titanium dioxide particles having photocatalytic activity are supported on almost one surface of the inorganic particles according to the configuration of the first means described above. Therefore, when near-ultraviolet light having a wavelength of 300 to 400 nm is irradiated from one direction, the present invention is used. Since the titanium dioxide particles having photocatalytic activity on the opposite side are not exposed to near-ultraviolet light and are not excited, decomposition of the organic binder in that portion can be prevented.

【0017】

Further, due to the configuration of the second means, since the material is only titanium dioxide particles having photocatalytic activity, they can be easily assembled and supported on each other in manufacturing.

【0018】

Further, since the third means can be easily sprayed and applied to the surface of the object, when the photocatalyst body is irradiated with near-ultraviolet light having a wavelength of 300 to 400 nm, the titanium dioxide particles having photocatalytic activity on the object side of the photocatalyst body can be coated. Since it is not exposed to near-ultraviolet light and is not excited, it is possible to prevent decomposition of the organic binder between the photocatalyst and the object.

【0019】

Further, by the configuration of the fourth means, the organic binder on the surface of the photocatalyst can be decomposed to prevent the adhesion of dust and the like so that the photocatalyst can be used at any time.

【0020】

In addition, due to the configuration of the fifth means, light-reflecting particles of near-ultraviolet light having a wavelength of 300 to 400 nm are mixed, so that near-ultraviolet light is reflected one after another, and even if the surface of the object is deep, it is deep. Near-ultraviolet light reaches the area, and the photocatalytic activity can be adjusted.

【0021】

[Example]

(Example 1) Hereinafter, the first embodiment of the present invention will be described with reference to FIG.

【0022】

As shown in the figure, in the photocatalyst body 1, titanium dioxide particles 3 having photocatalytic activity are supported on the surface of the inorganic particles 2 over substantially one surface. Examples of the inorganic particles 2 include magnesium silicate-based particles such as attapulsinet and sepiolite, aluminum silicate-based particles such as zeolite, zeklite, pentonite, and kaolin, alumina, and titanium dioxide having no photocatalytic activity. As the supporting method, there is a sintering supporting method, and there is also a thermal supporting method, a melt supporting method, or a supporting method using an inorganic binder. When using an inorganic binder, care must be taken not to impair the photocatalytic activity due to the inorganic binder adhering to the surface of the photocatalyst body 1. The size of the titanium dioxide particles 3 having photocatalytic activity is approximately Φ10 to 20 nm, and the size of the inorganic particles 2 is about the same as or larger than that of the titanium dioxide particles 3 having photocatalytic activity. If the size of the photocatalyst 1 is set to a size that allows visible light to pass through but cuts near-ultraviolet light having a wavelength of 300 to 400 nm, transparency can be provided.

【0023】

With the above configuration, the photocatalytic body 1 supports the titanium dioxide particles 3 having photocatalytic activity over substantially one surface of the inorganic particles 2. Therefore, when the photocatalyst body 1 is irradiated with near-ultraviolet light having a wavelength of 300 to 400 nm from one direction, it is inorganic. If the particles 2 are sufficiently large, the titanium dioxide particles 3 having photocatalytic activity on the opposite side are not exposed to near-ultraviolet light and are not excited, so that decomposition of the organic binder having an adhesive function with the object surface can be prevented. ..

【0024】

A plurality of inorganic particles may be used for the nucleus, and there is no difference in their action and effect.

【0025】

As described above, according to the photocatalyst of the first embodiment of the present invention, the photocatalyst can be activated and has transparency without decomposing the organic binder to be adhered to the surface of the object.

【0026】

(Example 2) Next, a second embodiment of the present invention will be described with reference to FIGS. 2 to 3. The same parts as those in the first embodiment are assigned the same numbers, and detailed description thereof will be omitted. As shown in the figure, the photocatalyst body 1 is configured by assembling titanium dioxide particles 3 having photocatalytic activity and supporting each other. As the supporting method, there is a sintering supporting method, and there is also a thermal supporting method, a melt supporting method, or a supporting method using an inorganic binder. When using an inorganic binder, care must be taken not to impair the photocatalytic activity due to the inorganic binder adhering to the surface of the photocatalyst body 1. The size of the titanium dioxide particles 3 having photocatalytic activity is approximately Φ10 to 20 nm, and the size of the photocatalyst 1 is approximately 3 to 20 times the size of the titanium dioxide particles 3 having photocatalytic activity. If the wavelength is set to a size that cuts near-ultraviolet light having a wavelength of 300 to 400 nm, transparency can be provided.

【0027】

With the above configuration, since the photocatalyst body 1 has a structure in which titanium dioxide particles 3 having photocatalytic activity are aggregated and supported, only one type of material is used, and supporting production such as sintering becomes easy. In addition, when near-ultraviolet light with a wavelength of 300 to 400 nm is irradiated from one direction, the titanium dioxide particles 3 having photocatalytic activity on the opposite side are not exposed to near-ultraviolet light and are not excited, so that they have an adhesive function with the object surface. It is possible to prevent the decomposition of the organic binder that has.

【0028】

As described above, according to the photocatalyst of the second embodiment of the present invention, it can be easily produced. In addition, the photocatalyst can be activated without decomposing the organic binder that adheres to the surface of the object, and can have transparency.

【0029】

(Example 3) Next, a third 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.

【0030】

As shown in the figure, the photocatalyst 1 and the organic binder 4 are mixed and configured. The organic binder 4 is appropriately selected from acrylic type, vinyl acetate type, fluororesin type, silicon resin type and the like, depending on the properties and familiarity of the object surface of the other party.

【0031】

With the above configuration, a mixture of photocatalyst 1 and organic binder 4 can be sprayed and applied to the surface of an object, and when this is irradiated with near-ultraviolet light having a wavelength of 300 to 400 nm, between the photocatalyst 1 and the object. Since the titanium dioxide particles 3 having photocatalytic activity are not exposed to near-ultraviolet light and are not excited, decomposition of the organic binder 4 between the photocatalyst 1 and the object can be prevented and adhesion can be maintained.

【0032】

As described above, according to the photocatalyst of the third embodiment of the present invention, it can be easily sprayed and applied to the surface of an object, and when the photocatalyst is activated by irradiating near-ultraviolet light having a wavelength of 300 to 400 nm, an organic binder is used. Adhesive strength can be maintained.

【0033】

(Example 4) Next, a fourth embodiment of the present invention will be described with reference to FIG. The same parts as those in the third embodiment are assigned the same numbers, and detailed description thereof will be omitted.

【0034】

As shown in the figure, the photocatalyst 1 and the organic binder 4 are mixed and spray-coated on the surface 5 of the target object. The spray-coated surface is irradiated with near-ultraviolet light having a wavelength of 300 to 400 nm by the black light 6.

【0035】

With the above configuration, when the black light 6 irradiates near-ultraviolet light with a wavelength of 300 to 400 nm, the organic binder 4 on the surface of the photocatalyst 1 is decomposed, and the near-ultraviolet light due to adhesion, adhesion and dust adhesion of dust and the like is generated. When the target contaminated organic component adheres to the photocatalyst 1 to prevent blocking, the photocatalyst 1 decomposes and purifies oil etc. by the near-ultraviolet light activation action with a wavelength of 300 to 400 nm, and the coated surface can be used at any time. It can be in a possible state.

【0036】

As described above, according to the method for supporting the photocatalyst according to claim 3 of the fourth embodiment of the present invention, the organic binder on the surface of the photocatalyst is decomposed, dust and the like are attached, and near-ultraviolet light is blocked by the adhesion of dust and the like. The coated surface can be made ready for use at any time.

【0037】

(Example 5) Next, a fifth embodiment of the present invention will be described with reference to FIGS. 6 to 7. The same parts as those in the third embodiment are assigned the same numbers, and detailed description thereof will be omitted.

【0038】

As shown in the figure, the photocatalyst 1 and the organic binder 4 and the light reflecting particles 7 of near-ultraviolet light having a wavelength of 300 to 400 nm are mixed to form a mixture 8. The mixture 8 is applied to the surface 10 of the honeycomb-shaped object 9 by spraying or dipping.

【0039】

According to the above configuration, when the mixture 8 is applied to the surface 10 of the honeycomb-shaped object 9 and the near-ultraviolet light having a wavelength of 300 to 400 nm is irradiated from one of the honeycomb-shaped objects 9, the organic binder 4 on the surface of the photocatalyst 1 is irradiated. Is decomposed and purified, and near-ultraviolet light is reflected one after another by the reflecting action of the light-reflecting particles 7 of near-ultraviolet light having a wavelength of 300 to 400 nm. Is irradiated with near-ultraviolet light, and the photocatalyst can be activated.

【0040】

As described above, according to the photocatalyst of the fifth embodiment of the present invention, even a deep honeycomb-shaped object surface can be easily applied, and near-ultraviolet light irradiated from one side is irradiated on the entire surface of the honeycomb-shaped object. The photocatalyst can be activated.

【0041】

[Effect of the invention]

As is clear from the above examples, according to the present invention, it is possible to select particles that are easily heat-supported as core inorganic particles, so that the photocatalyst body does not decompose the organic binder to be adhered to the object surface. It is possible to provide a photocatalyst having the effect of being able to activate and have transparency.

【0042】

In addition, since only titanium dioxide particles having photocatalytic activity are used as the material, the photocatalyst can be activated without decomposing the organic binder that adheres to the surface of the object, which can be easily produced, and has transparency. It is possible to provide a photocatalyst having the effect of being able to do so.

【0043】

Furthermore, it can be spray-coated on the surface of any object, and it can be supported with durability and workability without impairing the photocatalytic performance, and the adhesive strength of the organic binder is maintained when the photocatalyst is activated. It is possible to provide a photocatalyst having an effect that durability can be maintained in terms of adhesive strength.

【0044】

Further, it is possible to provide a photocatalyst having an effect of decomposing an organic binder on the surface of the photocatalyst, preventing the adhesion of dust and the like and blocking of near-ultraviolet light due to the adhesion of dust, and making the photocatalyst ready for use at any time.

【0045】

Furthermore, it can be easily applied even on the surface of a deep honeycomb-like object, and when irradiated with near-ultraviolet light having a wavelength of 300 to 400 nm, light-reflecting particles of near-ultraviolet light having a wavelength of 300 to 400 nm are mixed. Therefore, even if the near-ultraviolet light is reflected one after another and the surface of the object is deep, a photocatalyst that has the effect of reaching the near-ultraviolet light with a wavelength of 300 to 400 nm to the back and having photocatalytic activity is provided. it can.

[Simple explanation of drawings]

[Figure 1]

Cross-sectional view of the photocatalyst of the first embodiment of the present invention [Figure 2]

Cross-sectional view of the photocatalyst of the second embodiment [Fig. 3]

The same sectional view of the second embodiment. [Fig. 4]

Cross-sectional view of the photocatalyst of the third embodiment [Fig. 5]

Conceptual diagram of the method of supporting the photocatalyst of the fourth embodiment [Fig. 6]

Cross-sectional view of the photocatalyst of the fifth embodiment [Fig. 7]

Perspective view of the honeycomb-shaped object of the fifth embodiment [Explanation of symbols]

1 Photocatalyst 2 Inorganic particles 3 Titanium dioxide particles with photocatalytic activity 4 Organic binder 6 black light 7 Light-reflecting particles of near-ultraviolet light with a wavelength of 300 to 400 nm