JP2002151000A - Fluorescent lamp having photocatalyst antibacterial film and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance cleaning effect, up to antibacterial effect, while having deodorization/staining performance not less than that of a fluorescent lamp with a traditional photocatalyst film, without increasing the manufacturing cost. SOLUTION: Oxidized metal fine particles, in which an antibacterial metal of silver or the like is made to be carried, is made to be arranged only in the vicinity of a surface of a comparatively inexpensive titanium film without carrying the antimicrobe metal. As a result of this, the traditional cleaning effect turns into antibacterial effect, and the deodorization performance can be enhanced than that of the conventional cases and the manufacturing cost of the lamp can be nearly the same as that of the conventional cases.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a fluorescent lamp, and more particularly to a method for applying a "photocatalytic antibacterial film", which has a deodorizing effect, an antifouling effect by a photocatalytic action, and an antibacterial effect by an antibacterial agent. And a method for manufacturing a fluorescent lamp having the three effects described above.

[0002]

2. Description of the Related Art In recent years, a thin film of titanium oxide has been applied to various products, and the titanium oxide has been kneaded into a paint or the like, and the surface has been irradiated with ultraviolet rays to achieve a deodorizing and antifouling effect. The technology that can be obtained is applied in various fields. This technology has been applied to many product fields such as household goods and building materials, and is also applied to fluorescent lamps (for example, JP-A-10-116587).

FIG. 4 is a sectional view of a glass part of a conventional fluorescent lamp.
Shown in The fluorescent lamp 24 is a glass tube made of soft glass.
A fluorescent material 21 for converting ultraviolet light into visible light is applied to the inner surface of 22, and a photocatalytic film 23 is applied to the outer surface of the glass tube 1. The photocatalyst film 23 is obtained by coating titanium oxide 2 shown in FIG. 5 with a fixing agent 3 on a surface of the glass tube 22 as a thin film, drying and fixing the film. When the fluorescent lamp 24 is turned on, the ultraviolet light generated inside passes through the phosphor 22 and the glass tube 21 to reach the photocatalytic film 23. The coarse-grained titanium oxide 2 of the photocatalytic film 23 shown in FIG. 5 is irradiated with ultraviolet rays of 100 to 400 nm, thereby generating electrons e- and holes h ⁺ therein, which are in contact with the lamp surface in the atmosphere. Reacts with oxygen or water to generate active substances such as ionized oxygen and hydrogen peroxide (hereinafter referred to as “active species”).

[0004] Since all of the active species have the ability of oxidizing activity, organic species in contact with the surface of the photocatalytic film 23 are oxidized and oxidized.
Decomposition chemical reactions can occur. For example, when unpleasant smell molecules come into contact with the photocatalyst surface in the air, they are decomposed into water (gas), nitrogen gas, or carbon dioxide gas, which is odorless by the active species, and changed, resulting in a deodorizing effect. Become. In addition, even when dirt such as oil, which is an organic substance, adheres to the lamp surface, it causes a chemical reaction on the surface of the photocatalyst, decomposes, and changes to water, nitrogen gas, etc., so that a clean surface can always be maintained. It is known to exert Furthermore, when bacteria floating in the air adhere to the surface of the titanium oxide, they decompose and kill the cells of the bacteria, which are organic substances, and thus have a purifying effect. Therefore, the fluorescent lamp with a photocatalytic film has three advantages of deodorization, antifouling and purification compared to a conventional general lamp without the photocatalytic film 23.
It is a lamp that exhibits various kinds of effects, and has a feature that a cleaner living environment can be obtained.

[0005]

However, the conventional fluorescent lamp with a photocatalytic film requires a lot of time for the above-mentioned active species to decompose the cells of the microorganism in order to kill microorganisms such as bacteria. In addition, since the dead microorganisms are present on the photocatalytic film 23, the reaction between the microorganisms and the active species requires a large amount of time, so that the viable bacteria (living bacteria) are reduced by death. There was a disadvantage that the speed was reduced. Therefore, the number of viable bacteria after the antibacterial performance test of the product without the photocatalytic film and the product with the photocatalytic film does not reach the level of `` 100: 1 or less '' and does not exhibit the `` antibacterial effect '', and the purification effect Level.

[0006] As there are many practical examples recently, silver, copper,
Inorganic antibacterial agents in which an antibacterial metal such as zinc is "supported" by a non-antibacterial inorganic oxide such as titanium oxide have been developed. Carrying means that the antibacterial metal is mixed with a non-antibacterial inorganic oxide such as titanium oxide, or is formed in the form of a compound, or indicates that both are bonded to each other. . By applying and fixing the inorganic antibacterial agent on the surface of the glass tube 22, an antibacterial action can be exhibited.

FIG. 3 is a schematic view showing an example in which a photocatalytic antibacterial film 25 composed of an inorganic antibacterial agent in which the antibacterial metal 4 is supported on coarse-grained titanium oxide 2 is formed on the surface of a glass tube 22. ing. In FIG. 3, when bacteria contact the photocatalytic antibacterial membrane 25, the antibacterial metal 4 near the glass tube 22 of the membrane is
The effect is small because the distance to the bacteria is large,
It has the disadvantage of being wasted. On the other hand, since the antibacterial metal 4 is a very expensive material, there has been a demand for a method for forming a photocatalytic antibacterial film that reduces the amount of the material used and has the same antibacterial performance.

The present invention provides a deodorizing, antifouling, and purifying effect.
With a photocatalytic antibacterial film with a structure that aims to significantly improve the purification effect and improve the antibacterial effect, and to make the manufacturing cost almost the same as before. A method for manufacturing a fluorescent lamp is provided.

[0009]

Among the antibacterial metals, silver, copper, zinc and the like, silver, which is particularly frequently used, is one of the most expensive materials among the antibacterial metals. On the other hand, the manufacturing process of a photocatalytic antibacterial agent in which an antibacterial metal is supported on titanium oxide is a more complicated process than that of manufacturing titanium oxide as a photocatalytic film, and thus the manufacturing cost increases. In the present invention, in the cross section of the coating film of the photocatalytic antibacterial film, many antibacterial metals are arranged on the surface side (the side that comes in contact with air), and a portion close to the glass tube is arranged with an inexpensive non-antibacterial metal oxide. It is something devised as follows.

That is, by disposing the antibacterial metal on the surface of the coating film of the photocatalytic non-antibacterial metal oxide and at a position near the surface, the amount of the antibacterial metal used can be reduced, and the lamp manufacturing cost can be reduced. Can be reduced.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic structural view of a cross section of a coating film of a fluorescent lamp with a photocatalytic antibacterial film, which best illustrates the features of the present invention.

The surface of the glass tube 22 of the fluorescent lamp is coated with a coarse-grained titanium oxide 2 which is a photocatalytic non-antibacterial metal oxide having a relatively coarse particle, and is firmly attached to the glass tube 22 by a fixing agent 3 made of a metal oxide. It is stuck to. The structure was such that fine metal oxide particles 1 having a small particle size were arranged on the surface of the coarse particle titanium oxide 2 and at a position very close to the surface. The fine metal oxide particles 1 are formed by collecting particles of metal oxide particles such as photocatalytic titanium oxide and silica as a fixing agent, and silver, copper, zinc or the like as an antibacterial agent. A material that is carried and exhibits an antibacterial effect.

The phenomenon that causes bacteria to die can also be obtained by the active species generated by the photocatalytic action of titanium oxide exhibiting a photocatalytic effect and coarse-grained titanium oxide 2 among the fine metal oxides 1. The rate at which the antibacterial metal itself carried on the fine metal oxide particles 1 acts on bacteria to cause death is much higher, whereby the antibacterial performance can be greatly exhibited.

As shown in FIG. 2, when the outer shell 9 of the bacterium 5 such as Escherichia coli contacts the surface of the photocatalytic antibacterial film 25,
The antibacterial metal, for example, silver 7 moves along the entry route 8, destroys or penetrates the outer shell 9 of the bacterium 5, enters the body 6, and
Physiological circulatory action is stopped.

Hereinafter, a method for forming a photocatalytic antibacterial film having the structure of FIG. 1 according to the present invention will be described.

The coarse particle titanium oxide 2 is dispersed in water or an alcohol or a mixture thereof to produce a drug solution LA as a colloidal dispersion. On the other hand, for example,
74, a chemical liquid LB, which is a colloidal dispersion liquid of the fine metal oxide particles 1 supporting the antibacterial metal 4, is prepared and manufactured.

Next, the above-mentioned colloidal dispersion liquids LA and L
B and B are mixed to obtain a photocatalytic antibacterial liquid LC. On this occasion,
"Weight of coarse titanium oxide + fixative 3 in chemical LA: Chemical LB
Of fine metal oxide particles = 100: (0.001 to 40) ”. The chemical liquid LC is sprayed on the outer surface of the lamp glass tube 22 by spraying, and then dried to form the photocatalytic antibacterial film 25. After the application of the colloidal dispersion, the film strength does not increase in a short time when left at room temperature, and it takes several days or more. According to the experimental results of the inventor, it has been confirmed that if a heat baking operation is performed at 100 ° C. or more (about 300 ° C. or less) for 5 minutes or more, a film strength necessary for practical use can be obtained.

As a method of applying a chemical solution to the glass tube 22, there are many other methods such as a dip method and a brush coating method in which a glass tube is dipped in a chemical solution and gradually pulled up and applied, in addition to the above-mentioned spray method. The method has the advantages that the film thickness can be uniformly formed on the surface of glass tubes of various shapes, and the manufacturing method is easy and the cost is low.

The photocatalytic antibacterial agent liquid LC obtained by mixing the fine metal oxide particles 1 and the coarse titanium oxide 2 as described above is used in a drying step to evaporate water or alcohol as a solvent.
During drying, the photocatalytic antibacterial film 25 evaporates while gradually moving upward from the inside, that is, toward the surface in contact with air. During this movement, the fine metal oxide particles 1 move in the direction of the surface because the fine metal oxide particles 1 are lighter in weight than the coarse titanium oxide 2 (hereinafter, abbreviated as “surface moving effect of fine particles”). . Therefore, at the time of completion of drying or baking, most of the fine metal oxide particles 1 adhere to the surface and near the surface of the coarse titanium oxide 2 to complete the structure as shown in FIG. That is, it is possible to realize a structure as if the fine metal oxide particles 1 carrying the antibacterial metal 4 were applied on the coarse titanium oxide 2.

Here, in order to obtain the effect of moving the surface of the fine particles, the average particle diameter of the coarse titanium oxide 2: the average particle diameter of the fine metal oxide particles 1 = 100: (50 or less). It is desirable to configure.

The coarse titanium oxide 2 of the photocatalytic antibacterial film 25 shown in FIG.
The average particle size is preferably about 0.01 to 2.0 μm. If the average particle size is smaller than 0.01 μm, the ratio of the fine metal oxide particles 1 to the particle size becomes small, and the fine metal oxide particles 1 cannot be expected to have an effect of moving the fine particle surface. If it is larger than 2.0 μm, the visible light transmittance becomes small, and there is a disadvantage that the total luminous flux of the lamp is reduced.

The average particle diameter of the fine metal oxide particles 1 is 0.05 μm
When the particle size is too large, the effect of moving the surface of the fine particles cannot be expected.

The weight ratio of the coarse-grained titanium oxide 2 to the fine-grained metal oxide particles 1 is desirably in the range of about 100: (0.001 to 40). When the ratio of the fine metal oxide particles 1 is larger than this ratio, the level of the antibacterial effect is saturated, and the material cost of the photocatalytic antibacterial film 25 increases, which is not practical.

The average thickness of the photocatalytic antibacterial film 25 is 0.05 to 2.
About 0 μm is desirable. When the film thickness is less than 0.05 μm, the photocatalytic effect is not sufficiently exhibited, and when the film thickness is more than 2.0 μm, the light transmittance is reduced and the total luminous flux of the lamp is reduced.

In forming the photocatalytic antibacterial film 25 shown in FIG. 1, there is a method in which coarse-grained titanium oxide is applied in the first step, and fine-grained metal oxide 2 is applied in the second step. Two times, the production cost greatly increases,
It has the disadvantage of requiring a large capital investment. The photocatalytic antibacterial film 25 of FIG. 1, which is a configuration example of the present invention, has a size of 5 cm × 5 cm.
A film was formed by coating on the surface of a glass plate having a certain degree. At this time, the `` ratio of the average particle of the coarse-grained titanium oxide 2 to the average particle of the fine-grained metal oxide particle 1 '' is set to `` 100: (3 to 20) ''
+ Ratio of the weight of the fixing agent 3 to the weight of the fine metal oxide particles 1 "
Was formed as “100: (0.04 to 1.0)” and the average film thickness was 0.1 to 1 μm, applied by a spray method, and baked by heating. This was tested for antibacterial performance by the “Antibacterial Test Method (Film Adhesion Method)” defined in the “Standards for the Use of Terms Regarding the Control of Bacteria and the Like (1997)” of the Japan Home Appliances Fair Trade Association. As a result, the difference between the logarithm of both the "unprocessed product" that has not been subjected to the treatment of the present invention and the remaining number of viable bacteria of the "processed product" sample according to the present invention is 2 or more (the viable cell count ratio is 100: 1 or less), and antimicrobial performance could be satisfied.

[0026]

According to the present invention, it has been confirmed that the antibacterial effect can be exhibited by the test method publicly defined as described above.

As a secondary effect of the present invention, the deodorizing effect can be further improved. In other words, since the specific surface area of the fine particle titanium oxide in the fine particle metal oxide 1 is larger than that of the coarse particle titanium oxide 2, the area of the titanium oxide touching the odor molecules becomes large, and the active species also touches the area. It has been found that there is an incidental effect that the deodorizing performance is further increased since the amount is generated in proportion.

The deodorizing, antifouling, and antibacterial effects of the lamp of the present invention are exerted by irradiating the photocatalytic antibacterial film 25 with ultraviolet rays during lamp operation. . Regarding the antibacterial effect, since the antibacterial metal 4 such as silver acts on microorganisms regardless of the presence or absence of ultraviolet rays, the effect is exhibited both when the lamp is turned on and when the lamp is turned off.

[Brief description of the drawings]

FIG. 1 is a schematic view showing one structural example of a photocatalytic antibacterial film of the present invention.

FIG. 2 is a diagram schematically illustrating a case where bacteria contact the photocatalytic antibacterial film of the present invention.

FIG. 3 is a schematic view showing one structural example of a conventional photocatalytic antibacterial film.

FIG. 4 is a sectional view of a conventional fluorescent lamp.

FIG. 5 is a schematic diagram showing one structural example of a conventional photocatalytic film.

[Explanation of symbols]

 1 Fine metal oxide particles 2 Coarse particle titanium oxide 3 Fixing agent 4 Antibacterial metal 5 Bacteria 6 Bacteria 7 Silver 8 Ingress pathway 9 Bacterial shell 21 Phosphor 22 Glass tube 23 Photocatalytic film 24 Fluorescent lamp 25 Photocatalytic antibacterial film.

 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference) 4G059 AA07 AB09 AB11 AC22 DA01 DA04 DA09 DB04 EA04 EB05 EB06 GA01 GA14 4G069 AA03 AA08 BA02A BA02B BA04A BA04B BA14A BA14B BA48A BB02A BB02B BC31A BC31B BC31B BC FA03 FB06 FB23 FB24 FB30 FC08 5C043 AA20 BB09 CC09 CD01 DD27 DD33 EA11 EC02 EC03 EC06

Claims (8)

[Claims] (1) At least (1) a coarse particle titanium oxide, (2) a fixing agent such as a metal oxide, and (3) an average particle diameter of about 50% or less of the average particle diameter of the coarse particle titanium oxide on the outer surface of the glass tube. A photocatalytic antibacterial film having fine metal oxide particles carrying an antibacterial metal having an average particle size is applied and fixed, and the fine metal oxide particles are mainly fixed and disposed on or near the surface of the coarse titanium oxide layer. A fluorescent lamp with a photocatalytic antibacterial film. 2. The coarse particle titanium oxide has an average particle size of 0.01 to 0.01.
2. The fluorescent lamp with a photocatalytic antibacterial film according to claim 1, wherein the fluorescent lamp has a thickness of about 2.0 μm. 3. An average particle size of said fine metal oxide particles is 0.05 μm.
2. The fluorescent lamp with a photocatalytic antibacterial film according to claim 1, wherein the length is not more than m. 4. The weight ratio of the weight of the coarse-grained titanium oxide to which a fixing agent is added and the weight of the fine-grained metal oxide particles are 100 to 100.
2. The fluorescent lamp with a photocatalytic antibacterial film according to claim 1, wherein the fluorescent lamp is 0.001 to 40. 5. The photocatalytic antibacterial film has an average thickness of 0.05 to 2.0.
2. The fluorescent lamp with a photocatalytic antibacterial film according to claim 1, wherein the thickness is set to μm. 6. A colloidal dispersion of (1) a coarse particle titanium oxide and a fixing agent such as a metal oxide, and (2) a colloidal dispersion of a fine particle metal oxide supporting an antibacterial metal such as silver are separately prepared. 2. The method for producing a fluorescent lamp with a photocatalytic antibacterial film according to claim 1, wherein a photocatalytic antibacterial film is formed using a colloidal dispersion for a photocatalytic antibacterial film obtained by stirring and mixing these. 7. The method for producing a fluorescent lamp with a photocatalytic antibacterial film according to claim 6, wherein the photocatalytic antibacterial film is formed by spraying a colloidal dispersion liquid by spraying. 8. After the application of the colloidal dispersion, the temperature is 100 ° C. or higher.
7. The method for producing a fluorescent lamp with a photocatalytic antibacterial film according to claim 6, wherein the photocatalytic antibacterial film is formed by heating and baking under conditions of at least one minute.