JP2002292292A - Photocatalytic functional body and producing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form easily and surely a photocatalyst layer which works a photocatalytic action to the surface of glass substrate. SOLUTION: This photocatalytic functional body is made by including a light source 10 in a case 12 comprising a glass substrate and, further, features that metallic powder which works the photocatalytic action is sprayed to the surface of glass substrate at a spraying speed of >=150 m/sec and the photocatalyst layer 16 based on the metal oxides are formed on the surface of the glass substrate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a photocatalyst functional body and a method for producing the same.

[0002]

BACKGROUND ART Titanium oxide photocatalytic material such as zinc oxide antibacterial, deodorizing, water purification, known as functional material having an effect of air purification and the like. Antibacterial by these photocatalytic materials,
Effect of deodorization, etc., is due to oxidation-reduction reaction by the photocatalytic reaction. The photocatalyst material is used for very various purposes by utilizing its action, and there are many examples applied to lighting products. If utilizing a photocatalytic material in lighting products, the light for excitation can be easily obtained, possible to improve the specific features of lighting products such decrease in brightness can be prevented contamination of the surface of the lighting product can be prevented There is an advantage that can be.

As an example of application to lighting products, for example, a photocatalytic material such as titanium oxide is applied to the surface of a cover of a tunnel light or a street light to prevent dirt from adhering to the surface of the light cover. An example in which the brightness of the illuminating body is not reduced, and an example in which the cover of the illuminating body is coated with a photocatalyst material to purify, sterilize, and deodorize indoor air as a household lighting product (Japanese Patent Laid-Open No. 10-14970).
No. 8).

[0004]

[SUMMARY OF THE INVENTION Incidentally, when utilizing the photocatalyst material lighting products, the surface of the cover of the illuminating body, the surface of the light reflection plate, depositing a photocatalytic material on the outer surface of the tube such as a fluorescent lamp tube it is necessary to, when depositing the photocatalytic material to such object, for the case portion illumination light is transmitted as the cover or tube of the illuminating body, sufficient without interfering with the transmission of light It is necessary to exert a photocatalytic action, and when the photocatalytic material is applied to the surface of the light reflecting plate, it is necessary to apply the photocatalytic material in a form in which the photocatalytic effect is sufficiently exhibited.

Conventional methods for applying a photocatalyst material to an object include a two-layer coating method of an adhesive layer and a photocatalyst layer, a method of coating a photocatalyst material with a binder, and a photocatalytic material powder in the case of textiles. method for supporting by dispersing, in the case of sintered products such as tiles and a method such as to sinter the photocatalyst material on the substrate. However, when the photocatalyst layer is formed by coating the photocatalyst layer on the adhesive layer or using a binder, the photocatalytic material is not necessarily exposed to the outer surface, so that the photocatalytic action is not always effective. There is a problem that does not work.

Other methods for applying a photocatalytic material to the surface of an object include a high-frequency plasma agglomeration method (CVD method) and a laser ablation method. However, expensive equipment is required to use these methods. It is necessary and is not suitable for a product on which a photocatalyst material is applied for mass-produced products such as lighting products. The present invention has been made to solve the conventional problems in lighting bodies and the like using these photocatalyst materials,
To provide a photocatalytic functional units can be suitably exhibited preparation and photocatalytic action of the photocatalyst functional units can be suitably forming a photocatalyst layer on a surface of a glass substrate such as a fluorescent lamp tube.

[0007]

To achieve the above object, the present invention comprises the following arrangement. That is, in the method for producing a photocatalytic functional body, a metal powder having a photocatalytic effect is sprayed onto the surface of the glass substrate at a spray speed of 150 m / sec or more, and the oxide of the metal is sprayed on the surface of the glass substrate. Wherein a photocatalyst layer is formed. As the metal powder, a powder having a shot diameter of 30 to 50 μm can be preferably used, and as the metal powder, a titanium powder, a tin powder, and a mixed powder of titanium and tin are preferably used. it can. Further, after performing a process of forming the surface of the glass substrate to a rough surface, by spraying a metal powder on the surface of the glass substrate, to form a photocatalyst layer suitably on the surface of the glass substrate. Can be.

[0008] A photocatalytic functional member obtained by enclosing the light source in a case made of a glass substrate, a metal powder which exhibits a photocatalytic activity on the surface of the glass substrate, rate of 15
It was injected at 0 m / sec or more jet velocity, the photocatalyst layer of an oxide of said metal, characterized in that it is formed on the surface of the glass substrate.

[0009]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 shows an example in which a lighting body is configured as an example of a photocatalytic function body according to the present invention. 10 fluorescent lamp tube in the figure, a light source portion of the ultraviolet tube or the like, 12 cases formed in a cylindrical shape, 14 socket portion,
Reference numeral 16 denotes a photocatalyst layer covering the entire surface of the case 12. The case 12 is made of transparent glass and has a photocatalytic layer 1
6 is formed by being attached to the outer surface of the case 12.

The structure characterized by the method for manufacturing a lighting body according to the present embodiment is a case 1 formed of a glass base material.
2 is a method of forming a photocatalyst layer 16 using a powder of a metal having a photocatalytic action on the surface. That is, in the lighting body of the present embodiment, the photocatalyst layer 16 is formed on the outer surface of the case 12 as described below. First, a glass case 1
2 is subjected to a blast treatment to form a rough surface of the case 12. The case 12 is formed to have a rough surface in order to improve the adhesion between the surface of the case 12 and the photocatalyst layer 16. Of course, it is also possible to form the photocatalyst layer without forming the surface of the case 12 with a rough surface.

[0011] Then, the powder of the titanium or tin on the surface of the case 12 formed on the rough surface, or a mixed powder of titanium and tin to collide at a high speed, a titanium or tin by the collision energy at that time or titanium, The tin mixed powder is brought into close contact with the outer surface of the case 12. A method for forming a photocatalyst layer 16 by applying a powder of titanium or tin, or a mixed powder of titanium and tin on the surface of a glass base case 12 is described in Japanese Patent Publication No. 2-17607. By a similar method. That is, the air a metal powder such as titanium or tin type, when injected into the glass substrate at a high speed by using a blowing machine such as a centrifugal type, the energy decrease in the time of rebounding metal powder to collide It is converted to thermal energy and becomes partially hot and adheres to the surface of the glass substrate. These metal powders are deposited on the surface of the glass substrate as oxides, thereby forming a photocatalytic layer having a photocatalytic function.

As a powder of titanium or tin, or a mixed powder of titanium and tin, those having a shot diameter of 30 to 50 μm can be suitably used. These powders were injected at a high speed together with compressed air from a nozzle, formed as an oxidation film on the surface of the glass substrate. By squeezing the shot diameter and using compressed air, it is easy to inject at a speed of about 150 (m / sec) or more. Thereby, it is possible to form an oxide film of these metals on the surface of the glass substrate.

Titanium and tin can be suitably used as the metal powder which forms the photocatalyst layer by being sprayed on the surface of the glass substrate. Since titanium is a high melting point metal, when using titanium as a metal powder, high melting point glass such as quartz glass is used as a glass substrate. On the other hand, the glass substrate is in the case of low-melting glass such as lead glass using a tin. For glass having a melting point intermediate between low-melting glass and high-melting glass, a mixed powder of titanium and tin is used. Thus, titanium and tin are preferably used according to the properties of the target glass.

The following is an example in which quartz glass is used as the high melting point glass for the glass substrate, and a photocatalyst layer is formed on the surface of the glass substrate by the method of the present invention.

[Table 1]

[0015] From what has been using the high melting point glass as the glass substrate in this embodiment, the metal powder was only titanium. The rising temperature is the temperature at the surface of the glass substrate.
Oxides of titanium on the surface of a glass substrate by spraying a powder of titanium by the condition (titania) is generated. As for the photocatalytic layer on the surface of the glass substrate,
The photocatalyst layer becomes an oxygen-deficient gradient layer in which the outermost surface becomes the most oxygen-rich and oxygen decreases as it goes inside. When titanium successively adheres to the titanium adhered to the underlying glass substrate, the outer layer of titanium adheres to deprive the lower layer of titanium of oxygen, leaving the outermost surface with more oxygen It is considered to be.

This embodiment is an example in which titanium is applied to high melting point glass. However, for low melting point glass such as lead glass, tin powder having a melting point lower than that of titanium is used. the oxides of tin can be formed by adhering to the method and in the same manner on the surface of the glass substrate. This tin oxide also suitably functions as a photocatalyst layer. In addition, for a glass base material having a melting point approximately between the high melting point glass and the low melting point glass, titanium and tin are appropriately mixed and used. It is possible to increase the content of titanium for a glass substrate whose melting point is close to high melting point glass, but it is necessary to increase the content of tin for a glass substrate whose melting point is close to low melting point glass .

As described above, according to the method of the present invention, it is possible to form a photocatalyst layer without forming a rough surface of a glass substrate. This is achieved by spraying a metal powder onto a glass substrate at a very high speed and depositing it.
Of course, the photocatalytic layer can be formed more reliably by performing a blast treatment or the like to form a rough surface of the glass substrate.

As described above, in the method of the present invention, a titanium or tin powder or a mixed powder of titanium and tin is sprayed at an extremely high speed on the surface of the object of the glass substrate to form the photocatalytic layer. By coating the surface of the object with an appropriate pattern and spraying the powder, the photocatalytic layer can be formed on the surface of the object in an appropriate pattern. FIG. 2 shows an illuminating body assembled by inserting a light source into a cylindrical case 12 similarly to the illuminating body shown in FIG. Case 12
Is made of a transparent glass substrate, and a photocatalyst layer 16 is formed on the surface thereof by the above-described method. Not cover the entire surface of the case 12 by a photocatalyst layer 16 in the present embodiment, by forming a photocatalyst layer 16 in a grid, in which so as to expose the glass substrate partially casing 12.

As described above, by partially exposing the glass base material of the case 12, it is possible to prevent the illuminator from being blocked by the photocatalyst layer 16 from dimming. The illuminator can be made brighter than when covered with the photocatalyst layer 16. In addition, since the photocatalytic action of the photocatalyst layer 16 is further promoted by light irradiation, light is easily irradiated to the photocatalyst layer 16 by partially exposing the case 12, so that an effective photocatalytic action can be obtained. There is also.

The above-mentioned photocatalyst functional body is an example in which a photocatalyst layer 16 is formed on the case 12 of the illuminating body to exert a photocatalytic action. The products to be formed and used can be used effectively. For example, by forming a photocatalyst layer on the outer surface of a bulb such as a fluorescent lamp or a light bulb, or by forming the photocatalyst layer on a case of a lighting product or a light reflecting plate,
It can be used for prevention of contamination of these products, deodorization and sterilization in the room. Further, by forming a photocatalyst layer by the method described above to the surface of the glass plate, it can be provided as a window glass having a photocatalytic function. The window glass is hard to adhere stains can be used as a deodorant, equipped also effects sterilization such products.

The photocatalyst layer formed on the surface of the glass substrate by the method of the present invention is formed by spraying a powder of a metal having photocatalysis, such as titanium or tin, onto the glass substrate and depositing it as an oxide. Since it is applied to the glass substrate without any intervening substance such as a binder, there is an advantage that the photocatalytic action is formed in a very effective form. When used in combination with a light source that excites the photocatalyst layer, such as an illuminator, the photocatalytic action is more effectively exhibited, and it is possible to provide a product that exhibits an effective photocatalytic action. Further, according to the method of the present invention, since the photocatalyst layer is formed by a method of injecting a metal powder such as titanium or tin at a high speed, mass production is possible, and it can be suitably applied to general products such as lighting bodies and window glasses. There are advantages.

[0022]

According to the photocatalyst functional body and the method for producing the same of the present invention, the metal powder having a photocatalytic function is easily sprayed on the surface of the glass substrate by oxidizing these metals on the surface of the glass substrate. Objects can be formed,
This makes it possible to form a photocatalyst layer easily and reliably the surface of the glass substrate. Further, according to the photocatalytic function member according to the present invention, since the directly photocatalyst layer without passing through the inclusion of a binder or the like on the surface of the glass substrate is formed, the photocatalyst layer is efficiently photoexcited by the light source unit effective It has remarkable effects such as being able to exert a photocatalytic action.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a configuration of an embodiment of a photocatalytic function body according to the present invention.

FIG. 2 is a front view showing the configuration of another embodiment of the photocatalytic function body according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Light source part 12 Case 14 Socket part 16 Photocatalytic layer

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) B05D 5/00 B05D 5/00 H 7/00 7/00 E 7/24 301 7/24 301W 302 302A C03C 17/23 C03C 17/23 (72) Inventor Shishio Miyasaka 471 Marushinmachi, Kita-ku, Nagoya-shi, Aichi F-term (reference) 4D075 AA01 BB04X BB95Z CA15 CA34 CA45 DA13 DB13 DC25 EA02 EB01 EB57 4G059 AA07 AB01 AB05 AC30 EA02 EA04 EB09 4G069 AA03 AA08 BA04A BA04B BA14A BA14B BA48A BB04A BB04B BB06A BC22A BC22B BC50A CA01 CA11 CA17 EA07 EA11 EB05 FA03 FB24

Claims (7)

[Claims] 1. A metal powder having a photocatalytic effect is sprayed on a surface of a glass substrate at a spray speed of 150 m / sec or more, and a photocatalyst layer of the metal oxide is formed on the surface of the glass substrate. A method for producing a photocatalyst functional body. As wherein the metal powder, shot size 30 to 5
The method for producing a photocatalyst functional body according to claim 1, wherein a powder of 0 µm is used. 3. The method for producing a photocatalyst functional body according to claim 1, wherein a titanium powder is used as the metal powder. 4. A as a powder of metal, a manufacturing method according to claim 1 or 2 photocatalytic body wherein the use of powders of tin. 5. The method for producing a photocatalyst functional body according to claim 1, wherein a mixed powder of titanium and tin is used as the metal powder. 6. The method according to claim 1, wherein a metal powder is sprayed on the surface of the glass substrate after performing a treatment for forming a rough surface of the glass substrate. method for producing a photocatalyst body according 5. 7. A photocatalytic functional body including a light source in a case made of a glass substrate, wherein a metal powder having a photocatalytic effect is applied to the surface of the glass substrate at a speed of 150 (m / sec.). ) was injected in more of the injection speed,
A photocatalyst functional body, wherein a photocatalyst layer of the metal oxide is formed on a surface of the glass substrate.