JP2002036418A - Film material with photocatalytic function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a film material with a function as a material for cleaning environments which performs the effective, economical and safe cleaning of environments such as the decomposition/removal of smell, a harmful substance in the air or soil or displays an antibacterial or a mildew resistant effect. SOLUTION: This film material with a photocatalytic function is structurally characteristic in that a photocatalytic particle 10 having an inert ceramic 14 arranged, in an island fashion, as a photocatalyst 12 on the surface of the photocatalyst 12, is borne on the surface of a plastic film base 1, with or without the interposition of an undercoat layer 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plastic film material carrying photocatalyst particles,
In particular, the present invention relates to a film material having a photocatalytic function that functions as an environmental purification material that can be used for the purpose of decomposing and removing bad smells and harmful substances in the air, and antibacterial and antifungal.

[0002]

2. Description of the Related Art In recent years, odors in living and working spaces and environmental pollution by harmful substances such as exhaust gas from automobiles have become serious problems. Conventionally, as a method for preventing odor or a method for removing harmful substances in the air, there is a method of absorbing or adsorbing an absorbent such as an acid or an alkali or an adsorbent. This method has a problem in treating waste liquid and used adsorbent, and may cause secondary pollution. There is also a method of masking bad smells by using fragrances, but it has the disadvantage that odors of fragrances may be transferred to food and cause damage by odors of the fragrances themselves (for example, Nishida Konosuke, Heibonsha, encyclopedia of large volumes, volume 1, p136 (1984)).

On the other hand, it is known that irradiation of titania with light generates electrons having a strong reducing action and holes having a strong oxidizing action, and decomposes molecular species coming into contact with the redox action. This effect of titania is the so-called photocatalysis, and by utilizing this effect, decomposition and removal of organic solvents dissolved in water, environmental pollutants such as pesticides and surfactants, harmful substances and odors in the air, etc. It can be performed. This method can be used repeatedly only by utilizing titania and light, the reaction product is harmless carbon dioxide gas and the like, compared to methods such as biological treatment using microorganisms,
It is advantageous in that there are few restrictions on reaction conditions such as temperature, pH, gas atmosphere, toxicity and the like, and it is also possible to easily decompose and remove organic halogen compounds and organic phosphorus compounds which are difficult to treat by biological treatment.

[0004]

However, in studies on the decomposition and removal of organic substances using a titania photocatalyst, a powdery photocatalyst has been used as it is (for example, ALPruden and DF 0LLis, Journey).
nal of Catalysis, Vol. 82. 404 (1983), H. Hidaka, H.
Jou, K. Nohara, J. Zhao, Chemosphere, Vol.25,15
89 (1992), Teruaki Hisaga, Kenji Harada, Keiichi Tanaka, Industrial Water,
No. 379, 12 (1990)). Therefore, handling and use are difficult, for example, it is difficult to recover the photocatalyst after use, and it has not been easy to put the photocatalyst into practical use. In particular, when carried on the surface of a plastic film or kneaded into a plastic resin, the strong photocatalytic action degrades not only harmful organic substances and environmental pollutants, but also the plastic itself, so it is extremely susceptible to deterioration, and thin film It was impossible to use it in such a shape.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to effectively purify the environment by decomposing and removing odors, harmful substances in air, dirt, and antibacterial and antifungal. Another object of the present invention is to provide a functional film material as an environmental purification material that can be economically and safely performed.

[0006]

The gist of the means adopted by the present invention to achieve the above object is as set forth in the appended claims.

That is, the invention of claim 1 provides a photocatalyst particle in which the surface of a plastic film is partially coated with a ceramic which is inert as a photocatalyst,
Is carried as a gist of the invention.

According to a second aspect of the present invention, in the first aspect of the present invention, the ceramic which is inactive as a photocatalyst is at least one ceramic selected from alumina, silica, zirconia, magnesia, calcia, apatite, and amorphous titania. Is the gist of this.

The photocatalyst particles are those in which the surface of the photocatalyst is partially coated with a ceramic which is inactive as a photocatalyst. More specifically, as shown in FIG. FIG. 2 shows that the ceramic is formed in the net structure 14 of the mask melon.
As shown in the figure, there are two types of ceramics (apatite crystals) 16 in the form of rose flowers.

According to the first and second aspects of the present invention, the use of such photocatalyst particles is an essential component, even if the photocatalyst particles are carried on the surface of the plastic film substrate, the portion in contact with the plastics Is an inactive ceramic as a photocatalyst (because the surface of the plastic is not in contact with the photocatalyst), the plastics itself hardly decomposes, and the effect can be maintained for a long time. Further, since the photocatalyst (eg, titania particles) is exposed through the pores or the like or at the root of the rose-shaped apatite crystal, the photocatalyst can be photoexcited. That is, due to the redox effect of electrons and holes generated by the photocatalysis of the photocatalyst, environmental pollutants such as foul odors and harmful substances in the air can be easily decomposed and removed.

According to a third aspect of the present invention, in the first or second aspect, the photocatalyst particles are carried together with gravure printing ink.

According to the third aspect of the present invention having such a structure, in addition to the effects of the first or second aspect, the amount of photocatalyst particles carried on the plastic film is large, and the final product film is obtained. Even if the transparency of the image is reduced, since the characters and drawings are printed with the ink for gravure printing, the overall appearance and appearance are hardly affected. That is, a large amount of photocatalyst particles can be supported on the plastic film.

According to a fourth aspect of the present invention, in the first aspect of the invention, the photocatalyst particles are at least one selected from platinum, rhodium, ruthenium, palladium, silver, copper, iron and zinc. The gist of the present invention is to support a kind of metal on the surface.

According to the fourth aspect of the invention adopting such a configuration, in addition to the functions of the above-mentioned inventions,
Platinum or rhodium, ruthenium,
Since palladium, silver, copper, iron and zinc metals are supported, their catalytic action further enhances the environmental purification action such as the action of decomposing and removing unpleasant odors and odors, environmental pollutants, etc. and the antibacterial and antifungal actions. Can be achieved.

According to a fifth aspect of the present invention, in the first aspect of the invention, the surface of the plastic film is formed of platinum, rhodium, ruthenium, palladium, silver,
The gist is that the undercoat is made of at least one metal selected from copper, iron and zinc.

According to the fifth aspect of the invention adopting such a configuration, in addition to the effects of the inventions of the respective claims,
The photocatalyst particles can be carried neatly on the plastic film surface, and can be formed as a photocatalytic functional film material with even more excellent durability and uniform quality.
The recombination of electrons and holes can be prevented, and together, the action of decomposing and removing odors and the like can be maintained at a high level for a long time.

According to a sixth aspect of the present invention, in the first aspect, the crystal form of the photocatalyst is anatase.

According to the invention of claim 6 adopting such a configuration, in addition to the functions of the inventions of the respective claims,
Since the photocatalyst is a highly active anatase type, the action of decomposition and removal can be further improved.

The invention of claim 7 is the invention according to any one of claims 1 to 6, wherein the photocatalyst or the photocatalyst particles are formed as a photocatalyst fixed to a porous carrier. The gist is to be carried on the surface of the plastic film.

The invention according to claim 8 is characterized in that, in the invention according to claim 7, the porous carrier is a porous metal or foamed metal represented by nickel-cadmium, stainless steel, vermalloy, aluminum alloy, copper or the like; The gist of the present invention is any one of porous ceramics represented by activated alumina, silica gel, foamed glass, granular ceramic sintered body, clay sintered body and the like.

According to the seventh and eighth aspects of the present invention, the photocatalyst particles are fixed on the surface of the porous carrier. The specific surface area that can contact environmental pollutants such as environmental pollutants, organic solvents in sewage, and pesticides increases.
It is possible to efficiently adsorb environmental pollutants and the like, and to further increase the environmental purification action such as rapid and continuous decomposition and removal action and antibacterial and antifungal action.

According to a ninth aspect of the present invention, in the invention according to any one of the first to eighth aspects, a gist of the invention is that the film material is provided with a myriad of fine holes. Breathability can be ensured.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the plastic film material of the present invention will be described. However, this is a typical example, and the present invention will be described by the following examples without departing from the gist thereof. It is not limited.

In the present specification, the photocatalyst means that when irradiated with light (excitation light) having an energy (ie, shorter wavelength) larger than the energy gap between the conduction band and the valence band of the crystal, the photocatalyst is in the valence band. Is a substance that can generate conduction electrons and holes by the excitation of electrons (photoexcitation), such as titanium oxide, tin oxide, zinc oxide, vanadium oxide, bismuth trioxide, tungsten trioxide, and oxide Particles such as ferric iron, strontium titanate, and cadmium sulfide can be exemplified, and one or more of these particles can be used. From the viewpoint of exhibiting an excellent photocatalytic action, it is preferable to use titanium oxide. In addition, as crystalline titanium oxide, there are anatase type, rutile type and brookite type, and any of them may be used, but from the viewpoint of exhibiting the most excellent photocatalytic action, anatase type It is highly preferred to use titanium oxide of

More specifically, when the photocatalyst is irradiated with ultraviolet rays and is photoexcited, electron-hole pairs are generated on the surface of the photocatalyst. Of these, electrons reduce surface oxygen to generate superoxide ions (O ₂ ⁻ ), and holes oxidize surface hydroxyl groups to generate hydroxyl radicals (.OH), which are highly reactive. Both active species allow the odor and environmental pollutants to be treated very efficiently and reliably by redox decomposition.

Light sources for exciting the photocatalyst include sunlight, germicidal lamps, black lights, fluorescent lights, incandescent lights,
Mercury lamps, UV lights, xenon lamps, halogen lamps, metal halide lamps, chemical lights and the like can be used.

As the photocatalyst particles, photocatalytic particles having ceramics inactive as a photocatalyst having a net structure of mask melon (FIG. 1) or photocatalytic particles having ceramics (apatite crystal) in a rose flower shape and being inert as a photocatalyst are used. It is preferable to use any one of FIG.

Among the photocatalyst particles, those in which inactive ceramics are formed in a net structure of mask melon on the surface of the photocatalyst (titania particles) are made of a ceramic sol liquid to which an organic polymer is added. Titania particles) can be produced by coating the surface, drying by spray drying or the like, and then heating and firing. More specifically, since the organic polymer disappears during firing, pores can be formed on the surface of the ceramic film, and titania is exposed at the bottom of the pores.

The sol solution of the ceramic is prepared by suspending ultra-fine ceramics in water, hydrolyzing a metal alkoxide obtained by a reaction between an alcohol and a metal salt or a metal, or dissolving a metal alkoxide in a metal alkoxide. It is prepared by hydrolyzing a salt. At this time, a uniform and transparent solution is obtained by adding an alcoholamine or a glycol, and by using the solution, high-performance photocatalyst particles can be produced.

Examples of the metal alkoxide for preparing the ceramic sol solution include alkoxides of aluminum, silicon, zirconium, magnesium, calcium, titanium and the like, and alkoxides of a mixture thereof. Examples of the metal salts include organic acid salts of these metals, such as acetate, oxalate, 2-ethylhexanoate, stearate, lactate, and acetyl acetate.

The firing temperature for producing the photocatalyst particles is 400 ° C. or less when amorphous titania is supported, and 60 ° C. when other ceramics are supported.
It is preferably 0 ° C. or less, and at most 700 ° C. or less. If the firing temperature is high, the grain growth of the ceramics occurs and the height of the island becomes high. However, if the firing temperature is higher than 700 ° C., titania is unfavorably changed to a rutile crystal form having low activity as a photocatalyst.

As the organic polymer to be added to the ceramic sol, polyethylene glycol or polyethylene oxide, polyvinyl alcohol, cellulose,
Water-soluble polymers such as cellulose derivatives may be mentioned, and polyethylene glycol or polyethylene oxide is particularly preferred.
Those having a value of 00 or more are preferable. When a material having a molecular weight of less than 1000 is used, the resulting ceramic film tends to peel off from the surface of the titania particles on the substrate, and it tends to be difficult to form a clean and strong film. Further, the amount of the organic polymer is preferably equal to or less than its solubility, and when added in excess of the solubility, it does not tend to form round and fine pores, and it is difficult to form a clean film.

The size of the pore diameter and the density of the pore distribution on the surface of the photocatalyst particles can be controlled by changing the amount and molecular weight of the organic polymer added to the ceramic sol. The pores on the surface of the photocatalyst particles become small when the addition amount is small or when the molecular weight is small, and when the addition amount is large or when the molecular weight is small, the pores are small. It will be big. When the addition amount is small, the density of the pore distribution becomes sparse, but when the addition amount is large, the pore distribution is dense. When an organic polymer having a wide molecular weight distribution is added, photocatalyst particles having pores of various pore sizes on the surface can be obtained. Furthermore, by laminating thin films, photocatalyst particles having a unique three-dimensional structure can be obtained.

The photocatalyst particles thus produced are:
The surface of the titania particles is coated with a ceramic film that is inactive as a photocatalyst, and the surface of the ceramic film has pores, and titania, which is active as a photocatalyst, is exposed at the bottom of the pores. Even when it is carried on a plastic, the portion in contact with the plastic is a ceramic which is inactive as a photocatalyst, so that the plastic itself does not decompose. Therefore, it is possible to adsorb harmful substances in the air, such as odors and NOx, organic solvents dissolved in water, and organic compounds contaminating the environment, such as pesticides. Due to the redox effect of the pores (by photocatalysis), they can be rapidly and continuously decomposed and removed, and can be used as antibacterial and antifungal materials. Energy saving and maintenance free.

Photocatalytic particles having rose flower-shaped ceramics (apatite crystals) are produced by growing apatite precipitated from a solution containing calcium and phosphorus on the surface of the photocatalyst. For example, when the photocatalyst is titanium oxide, a mixture of titania particles and apatite or titania particles is immersed in an isotonic simulated body fluid containing both calcium hydroxide and phosphate ions, and allowed to stand, to thereby obtain titania particles. Photocatalytic particles formed by depositing apatite generated by the reaction of calcium hydroxide and phosphate ions on the surface and growing them in the shape of rose flowers on the surface of titania particles, for example, rose flower shape on the surface Titanium particles supported in the form of islands in apatite suspended in water or a binder, those obtained by hydrolysis of a titanium compound such as an alkoxide of titanium obtained by reaction of alcohol with titanium tetrachloride or metal titanium, Are examples.

The “apatite” may be any one of hydroxyapatite, carbonate apatite, fluorapatite, tricalcium phosphate, and octacalcium phosphate, or a mixture of two or more thereof. The apatite formed on the titania particles is porous and has high affinity (biocompatibility) with proteins and carbohydrates, which are biological constituents such as bacteria and mold, so that microorganisms such as bacteria and mold can be efficiently treated. They can be adsorbed and can be quickly and continuously redox-decomposed by the above-mentioned reactive species having high reactivity, and finally can be decomposed to carbon dioxide. That is, it is possible to completely prevent the generation of offensive odor substances that are produced by life activities such as bacteria and molds and released outside the cells.

On the surface of each photocatalyst particle, platinum, rhodium, ruthenium, palladium, iron, silver, copper,
A metal film such as zinc can be supported by a PVD method such as a photoelectrodeposition method, a CVD method, a sputtering method or a vacuum evaporation method, thereby facilitating the charge separation of electrons and holes, thereby reducing oxidation and reduction by photocatalysis. In addition to promoting decomposition, it can be introduced as an auxiliary means of oxidative decomposition or reductive decomposition by the metal catalyst, and further enhances environmental purification effects such as decomposition and removal effects of organic compounds and antibacterial and antifungal effects.

When the photocatalyst particles are a porous photocatalyst in which a photocatalyst (titania particles) is fixed to the surface of a porous carrier, the specific surface area of the photocatalyst particles can be increased, and the photocatalysis can be more effectively performed. It can be expected to be expressed. Examples of the porous carrier used for such purposes include nickel-cadmium, stainless steel, vermalloy, aluminum alloy, a porous metal such as copper and a foamed metal, activated carbon, activated alumina, silica gel, foamed glass,
Examples thereof include porous ceramics represented by a granular ceramic sintered body, a clay sintered body, and the like. From the viewpoint of a large specific surface area and cost, it is preferable to use a porous ceramic such as activated carbon, activated alumina, or silica gel as a carrier. The shape of the porous carrier is granular,
The shape may be any shape such as a plate, a cylinder, a prism, a cone, a sphere, a rugby ball, and the like.

The photocatalyst particles or porous photocatalysts described above are made of polyethylene, nylon, polyvinyl chloride,
Polyvinylidene chloride, polyester, polypropylene,
Polyethylene oxide, polyethylene glycol, polyethylene terephthalate, silicone resin, polyvinyl alcohol, vinyl acetal resin, polyacetate, A
All kinds of plastic films such as BS resin, epoxy resin, vinyl acetate resin, cellulose, cellulose derivative, polyamide, polyurethane, polycarbonate, polystyrene, urea resin, fluororesin, polyvinylidene fluoride, phenol resin, celluloid, chitin, starch film Alternatively, on the surface of these copolymer films, when the film has a water-repellent property, platinum, rhodium, ruthenium, palladium,
An undercoat can be applied with at least one metal selected from silver, copper, iron, and zinc, and applied.

In particular, photocatalyst particles are added to a film printing ink such as an aqueous gravure ink and printed on a plastic film so that the photocatalyst particles can be carried on the film surface. According to this film material, even if it carries a large amount of photocatalyst particles to such an extent that the transparency of the film is lost, since the characters and drawings are printed, the overall appearance and appearance of the film are hardly affected. That is, it is preferable because a large amount of photocatalyst particles can be carried on the surface of the film to such an extent that the film substantially becomes cloudy and affects its transparency.

The film material produced in this manner is provided with a number of fine holes by means of a heat roller having a large number of needles protruding therefrom, so that the film material carrying photocatalyst particles or a porous photocatalyst can be obtained. The photocatalyst particles or the porous photocatalyst can be supported after forming an infinite number of micropores in the film or after forming an infinite number of micropores in the film. When the hot needle-like body is pulled out, the film at that portion is pulled and hardened, so that a large annular body and a small annular body are generally formed on the outer peripheral edge of each fine hole.

[0042]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail with reference to the following embodiments. However, only typical ones are shown, and the design can be changed within the scope of the present invention.

FIG. 3 is a cross-sectional view schematically showing one embodiment of a plastic film material having a photocatalytic function, and FIG. 4 is a cross-sectional view schematically showing a main part of the plastic film material having the photocatalytic function. In the figure, some are omitted.

A mixture of Sakata Inx Co., Ltd. product name "Poly S Diamond DX-60 Medium" and the company product name "Solvent 2" is used as an undercoat agent and photocatalyst particles are mixed. It was also used as a binder. The photocatalyst particles 10 are fine particles of an apatite composite titanium oxide for photocatalyst having an inactive ceramic 16 as a photocatalyst in the form of islands on the surface of the titania particles 12, having an average particle diameter of about 30 nm and a thickness of 50 μm. A biaxially stretched polypropylene film was used as the substrate 1.

On the entire surface of the biaxially oriented polypropylene film 1, "Poly S diamond DX-60 medium"
An undercoat agent comprising a mixture of 70 to 5% by weight and 30 to 95% by weight of "solvent 2" is applied to form an undercoat layer 3.
Is formed, on each undercoat layer 3, the undercoat agent of each concentration described above is the binder agent 5, in which the "photocatalyst particles" 10 are mixed at a ratio of 0.1 to 25.0% by weight. Each of the resulting mixtures was applied and dried to obtain test samples. Each test sample was cut into a size of 20 × 15 cm to obtain a test piece.

Each test piece was provided along the bottom surface of a styrene foam container formed in the same shape, and 10 p
100 ml of pm methylene blue solution was added so as not to leak or overflow from the specimen. Then, these were placed under direct sunlight and 1.5 m below the ceiling where four 36 W fluorescent lamps were installed, and the degree of bleaching of methylene blue with time was measured.

Example 1 An undercoat layer was formed on the entire surface of a biaxially stretched polypropylene film using a mixture of 70% by weight of "PolyS diamond DX-60 medium" and 30% by weight of "solvent 2" as an undercoat agent. On top of this layer, "Poly S
A mixture of 15% by weight of “Dia DX-60 medium” and 85% by weight of “solvent 2” was used as a binder agent, and photocatalyst particles were added therein to 0.3, 0.5, 1, 3, 5, 10, 1
The mixture mixed at a ratio of 5, 20% by weight was applied respectively, and each test piece was prepared in the same manner as described above, and the photocatalytic action of each test piece was examined using the degree of methylene blue decolorization as an index.

FIG. 5 shows the experimental results when irradiating direct sunlight, and FIG. 6 shows the experimental results when irradiating a fluorescent lamp. 5 and 6, the experimental result when the photocatalyst particles were mixed at a ratio of 0.3% by weight was 0.5%.
1% by weight, 3% by weight, 5% by weight, 10% by weight, 15% by weight, 2%
0% by weight is indicated in each case.

FIG. 5 shows that the test piece coated with the mixture containing the photocatalyst particles in a proportion of 5% or more decolorizes all methylene blue when exposed to direct sunlight for a day and a day (substantially about 12 hours). In the case of a test piece coated with a mixture of 0.3 to 5%, direct sunlight needs to be applied all day and night (virtually about 24 hours) to decolorize all methylene blue. I understand.

According to FIG. 6, according to the test piece coated with the mixture in which the photocatalyst particles were mixed at a ratio of 15% by weight or more, in order to decolorize all the methylene blue, the light of the fluorescent lamp was changed to 5%.
According to the test piece coated with the mixture of 0.3% by weight, it is necessary to irradiate the light of a fluorescent lamp for about 14 days in order to decolorize all the methylene blue.

When a layer of photocatalyst particles is formed on the undercoat agent layer, 20 to 5% by weight of “medium” and 80 to 95% by weight of “solvent 2” are mixed to obtain a binder. It was found that a good dose-response relationship was obtained when the photocatalyst particles were uniformly dispersed at a ratio of 0.1 to 20% by weight, preferably 3 to 10% by weight. "Photocatalyst particles"
Is less than 0.1% by weight, the photocatalytic action does not sufficiently appear. On the other hand, the photocatalytic action when mixed at 15% by weight or more is not much different from the photocatalytic action when mixed at 15% by weight and does not emit a bad smell. It has been found that cellotape (registered trademark) tends to deteriorate in terms of scratching strength (peeling strength), coating properties, and the like.

[0052]

As described above, according to the present invention, although the surface of titania particles is covered with a ceramic film which is inactive as a photocatalyst, pores are formed on the surface of the ceramic film, and the bottom of the pores is formed. Because the titania is exposed to the surface, even if the photocatalyst particles are supported on the plastics surface, the contact portion with the base film is an inactive ceramic as a photocatalyst (the base plastic surface and the photocatalyst particles Therefore, the effect can be maintained for a long time without causing decomposition of the plastic substrate itself. In addition, since titania can be photo-excited through the pores, environmental pollutants such as odors and harmful substances in the air can be easily decomposed and removed.

In particular, according to the third aspect of the present invention, even when a large amount of photocatalyst particles that impair the transparency of the surface of the plastic film are supported, the photocatalyst particles are printed as characters and drawings together with the gravure ink, so that the overall appearance is improved. And has little effect on aesthetics. That is, more photocatalytic functional particles can be supported without impairing the overall appearance or appearance.

According to the fourth aspect of the present invention, in addition to the functions of the above-mentioned inventions, platinum, rhodium, ruthenium, palladium,
Metals such as silver, copper, iron, and zinc are supported, and their catalytic actions act synergistically. Therefore, they have the effect of decomposing and removing unpleasant odors, foul odors, environmental pollutants, etc., as well as their antibacterial and antifungal activities. Can be further increased.

According to the fifth aspect of the present invention, in addition to the effects of the above-mentioned inventions, the photocatalyst particles can be carried on the plastic film surface neatly, and the durability and the quality are more excellent. A photocatalytic functional film material can be formed.

According to the sixth aspect of the present invention, in addition to the functions of the above-mentioned inventions, titania is an anatase type having high activity as a photocatalyst.

According to the seventh and eighth aspects of the present invention, in addition to the effects of the above-mentioned aspects, the photocatalyst particles are fixed on the surface of the porous carrier, and the odor, environmental pollutants, and organic substances in the wastewater are eliminated. It has a large specific surface area that can contact environmental pollutants such as solvents and agricultural chemicals, and can efficiently adsorb environmental pollutants. Can be increased.

According to a ninth aspect of the present invention, in the invention according to any one of the first to eighth aspects, the film material is provided with a myriad of fine holes so that air permeability can be ensured and the photocatalyst particles can be secured. Can increase the exposed specific surface area to exhibit more effective photocatalysis.

[Brief description of the drawings]

FIG. 1 is a partial perspective view schematically showing one photocatalyst particle constituting a film material having a photocatalytic function of the present invention.

FIG. 2 is a partial perspective view schematically showing another photocatalyst particle constituting a film material having a photocatalytic function of the present invention.

FIG. 3 is a cross-sectional view schematically showing one embodiment of a film material having a photocatalytic function of the present invention. ,

FIG. 4 is a cross-sectional view schematically showing a main part of the film material, and is partially omitted.

FIG. 5 is an experimental result showing a change in the degree of bleaching when the film material of the present invention is irradiated with direct sunlight. The horizontal axis is the light irradiation time (day) of direct sunlight, and the vertical axis is the percentage (%) of the remaining amount of methylene blue.

FIG. 6 is an experimental result showing a change in the degree of bleaching when the film material of the present invention is irradiated with a fluorescent lamp. The horizontal axis is the period (days) of light irradiation of the fluorescent lamp, and the vertical axis is the percentage (%) of the remaining amount of methylene blue.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Plastic film base material 3 ... Undercoat layer 5 ... Binder agent 10 ... Photocatalyst particles 12 ... Photocatalyst (titanium dioxide) 14 ... Mask melon-shaped ceramics (apatite) 15 ... Pores 16 ... Rose flower-like apatite 20 ... Film material with photocatalytic function

 ──────────────────────────────────────────────────続 き Continuation of the front page (74) The above two agents 100083932 Attorney Takenori Hiroe (72) Inventor Hiroshi Taoda 1-333 Kiyosumi-cho, Chikusa-ku, Nagoya-shi, Aichi Prefecture (72) Inventor Hisayoshi Mori Nagoya, Aichi Prefecture 1106 Mori Seisakunai, Tomita-cho, Nakagawa-ku, Ichigai Mori Seisakuchi (72) Inventor Takashi Mori Takashi Mori, Nakata-ku, Nagoya-shi, Aichi 1106 Mori Seisakunai, F-term (reference) 4D048 AA22 AB03 BA01Y BA02Y BA06Y BA07X BA07Y BA08Y BA10X BA10Y BA16Y BA30Y BA31Y BA32Y BA33Y BA34Y BA35Y BA36Y BA39Y BA41Y CA06 EA01 4F100 AA17B AA18B AA19B AA20B AA21 AA21B AA27B AA37B AB01B AB02B AB02C AB04B AB10B AB16B AB17B AB17C AB18B AB18C AB24B AB24C AB31B AD00B AG00B AK01A AK07 BA02 BA03 BA06 BA10A BA10B CC00C DC11 DE01B DJ01B DJ10B EH46 EJ38 HB31 JC00 JD02 JL02 JL08 JL08B 4G069 AA01 AA03 AA04 AA15 BA01A BA04A BA04B BA05A BA06A BA12A BA13A BA18 BA22A BA22B BA48A BB04A BC09A BC16A BC31A BC32A BC35A BC36A BC66A BC68A BC70A BC71A BC72A BC75A CA03 CA10 CA17 DA05 EA02X EA02 EA10 EC02

Claims (9)

[Claims] 1. A photocatalyst having a photocatalyst partially coated with an inert ceramic as a photocatalyst is supported on a surface of a plastic film.
Film material with photocatalytic function. 2. The film material having a photocatalytic function, wherein the ceramics inactive as a photocatalyst are alumina, silica, zirconia, magnesia, calcia, apatite,
2. The film material having a photocatalytic function according to claim 1, which is at least one kind of ceramics selected from the group consisting of amorphous titania. 3. The film material having a photocatalytic function, wherein the photocatalyst particles are carried together with an ink for gravure printing.
Film material with photocatalytic function. 4. The film material having a photocatalytic function, wherein the photocatalyst particles carry at least one metal selected from platinum, rhodium, ruthenium, palladium, silver, copper, iron, and zinc on the surface thereof. The film material having a photocatalytic function according to any one of claims 1 to 3, wherein the film material has a photocatalytic function. 5. The film material having a photocatalytic function, wherein the surface of the plastic film is formed of platinum, rhodium,
The film having a photocatalytic function according to any one of claims 1 to 4, wherein the film is undercoated with at least one metal selected from ruthenium, palladium, silver, copper, iron, and zinc. Material. 6. The film material having a photocatalytic function according to claim 1, wherein the crystal form of the photocatalyst is anatase. 7. The film material having a photocatalytic function, wherein the photocatalyst or the photocatalyst particles are formed as a porous photocatalyst fixed to a porous carrier, and are supported on the surface of the plastic film as the porous photocatalyst. The film material having a photocatalytic function according to any one of claims 1 to 6, wherein: 8. The porous carrier is made of a porous metal or foamed metal represented by nickel-cadmium, stainless steel, vermalloy, aluminum alloy, copper and the like, activated carbon, activated alumina, silica gel, foamed glass, and granular ceramics. The film material having a photocatalytic function according to claim 7, wherein the film material is any one of porous ceramics represented by a sintered body and a clay sintered body. 9. A film material having a photocatalytic function,
2. An infinite number of micro holes are provided.
9. The film material having a photocatalytic function according to any one of items 1 to 8.