JP2000239823A - Photocatalytically functional body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a general-purpose photocatalytically functional body having a wide use end capable of retaining its sterilizing power and deodorizing power over a long time. SOLUTION: When the photocatalytically functional body 2 is formed by low temperature thermal spraying, conditions are set so as to obtain a photocatalytic film consisting of 10-40 wt.% anatase type crystals of titania and 60-90 wt.% rutile type crystals of titania. In the case of a coating film or printing ink, 50-80 wt.% rutile type fine grains of titania, 20-50 wt.% anatase type fine grains of titania, fine metal particles and fine ceramic particles as an adsorbent are mixed in a binder and stuck on a substrate 1 to form the objective body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to paper products, cloth products,
The present invention relates to a photocatalyst functional body which is attached to a base material such as a plastic product, a metal product, and a ceramic ball, can provide excellent sterilizing power and deodorizing power for a long period of time, and does not violate the base material.

[0002]

2. Description of the Related Art The present applicant has developed a photocatalyst for decomposing bacteria, viruses and harmful substances in our living environment.
JP-A-6-254139 discloses a photocatalytic functional body formed by spraying a mixture containing an optical semiconductor ceramic, a metal powder and an adsorbent such as apatite on a substrate. Further, Japanese Patent Application Laid-Open No. 10-17847 discloses a photocatalyst utilizing such a photocatalyst as a printing ink and a paint.

[0003]

Accordingly, the present applicant has further developed and developed these photocatalysts to provide a photocatalyst functional body which is more versatile and can maintain sterilizing power and deodorizing power for a long period of time. The purpose is to do.

[0004]

Therefore, the photocatalyst functional body of the present invention sprays fine powder of rutile-type crystal titanium oxide (TiO ₂ ) on a substrate by low-temperature spraying to form anatase-type crystals 10 to 40. A photocatalyst film of 60% by weight and 60 to 90% by weight of a rutile crystal was formed on the substrate.

Further, the photocatalyst functional body of the present invention comprises 10 to 50% by weight of anatase type crystal particles and 50 to 90% by weight of rutile type crystal particles of titanium oxide (TiO ₂ ), metal fine particles and ceramic fine particles as an adsorbent. Was mixed in a binder, and a coating or printing ink formed was applied or printed on the substrate.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The photocatalyst functional body of the present invention is applied to a base material such as a polyester nonwoven fabric, paper, woven fabric, plastic, metal plate, ceramic ball or the like by a low-temperature spraying method without a binder, and contains a binder. In some cases, the printing ink or paint is adhered to the base material.

FIG. 1 shows a state in which a photocatalyst is adhered to the surface of a substrate by a low-temperature thermal spraying method. The photocatalyst is formed on a substrate 1 such as a nonwoven fabric, a woven fabric, paper, wood, a ceramic plate, a metal plate, or a plastic plate. For example, titanium oxide (TiO ₂ ) fine particles (5 to 50 μm) having a melting point of 2000 ° C. or less and metal fine particles 1 to 10 μm are melted at about 2900 to 3000 ° C. by a gas spraying method using oxygen, acetylene or the like. The sprayed ceramics. In the sprayed state, the photocatalyst particles 2 are composed of titanium oxide particles 2a acting as one electrode and a metal, for example, silver particles 2b, carried as the other electrode carried on the titanium oxide particles 2a. The photocatalyst particles 2 form an electrochemical cell, and after thermal spraying, become flat laminated particles of 30 to 40 μm, and adhere to the substrate 1 by the anchor effect while being melted by the high temperature of the gas. In the low-temperature thermal spraying method by gas thermal spraying using oxygen, acetylene, etc., the gas torch for injecting the molten photocatalyst fine particles and the base material are relatively moved so that the base material surface does not rise to 50 ° C. or more. Therefore, thermal spraying can be performed on paper, cloth, and the like. However, because of gas spraying, the melting point of the powder used is 200
Limited to 0 ° C or less. In addition, plasma spraying is also possible by adjusting the relative speed between the torch and the base material,
With plasma spraying, the material used can be sprayed to a melting point of about 3500 ° C.

In general, in thermal spraying, since powder is adhered to a substrate by an anchor effect, a powder for thermal spraying is preferably a lump having a size of 5 μm or more, and all anatase is transferred to rutile as a thermal spraying powder. Things are used. Titanium oxide in the form of anatase crystals (titania) has a strong photocatalytic action, but if all the photocatalyst particles after thermal spraying have anatase crystals,
Since the decomposition action is so strong that the substrate is violated, it cannot be put to practical use. However, the particle size of the anatase crystal particles, the thermal spraying temperature, the substrate surface temperature and the heating source used are respectively 5 to 25 μm, about 2900 to 3000 ° C., 40 to 40 μm.
By adjusting and selecting 50 ° C. and gas, 10-40% of anatase crystals can be synthesized. That is,
If the transformation point between anatase and rutile exceeds about 750 ° C., all the crystals become rutile-type crystals. However, according to the above-described low-temperature spraying method, when all the rutile crystal particles are prepared and sprayed, the particles become 10%. ~ 40% of anatase crystals are produced, the rest being rutile crystals. According to various experiments, X-ray analysis revealed that the weight ratio of anatase to rutile after thermal spraying was preferably 1: 3.

If the photocatalyst particles 2 are mixed with an adsorbing material 3 for adsorbing bacteria such as apatite, zeolite and activated carbon, harmful substances, odors and the like and sprayed, the amount of anatase crystals is adjusted so as not to violate the substrate. This reinforces the point where the photocatalytic action is weakened.

That is, the hydroxyapatite 3 after thermal spraying adsorbs and holds an object to be treated such as bacteria, harmful substances, and odors in the atmosphere, and treats the object to be adsorbed and held as a photocatalyst particle having 20 to 30% by weight of anatase crystal. Since 2 is decomposed, photocatalysis is reinforced. In order to enhance the photocatalytic action, it is necessary to increase the contact area where the particles come into contact with the object, but the low-temperature spraying method is preferable because the particles are finer than plasma spray and a film having a large surface area is formed. .

As the optical semiconductor powder, TiO ₂ and C
dS, CdSe, WO ₃ , Fe ₂ O ₃ , SrTiO ₃ , KN
bO _{3 and the} like. As the metal powder forming the electrode, various metal powders such as gold, platinum, and copper can be used in addition to silver. Metal powders as photocatalysts include:
Since water is required as one of the indispensable elements for the photocatalyst to exert its essential function, the metal powder needs to be stable without change over time in the presence of water. Among them, platinum is most preferable, but silver is preferable because it has the above characteristics in consideration of economy, and is non-toxic and has sterilization itself. In addition, the electrodes are not necessarily limited to metals, and it has been found that, for example, silicon Si can be used instead of these metals, and the silicon electrodes also cause electron transfer.
Silver, gold, platinum and the like are expensive and the use of silicon has a great economic effect.

The above-mentioned adsorbing material is for adsorbing and holding objects to be treated such as bacteria, viruses, molds, malodorous substances and harmful substances. As such an adsorbing material, one or more selected from the group consisting of ceramic powders such as apatite (apatite), zeolite or sepiolite, activated carbon, and silk fiber-containing materials can be used. They can be used in combination.
Here, apatite includes hydroxyapatite [C, which selectively adsorbs proteins such as bacteria, viruses, and molds.
a ₁₀ (PO ₄ ) ₆ (OH) ₂ ] is preferred. Examples of the silk fiber-containing material include, in addition to the silk fiber powder, a granulated material, a gel material, and the like. The particle size of these adsorbent materials (when the silk fiber-containing material is powder) is not less than 0.00 in view of securing a larger surface area and good workability of application.
1 to 1.0 μm is preferred, and particularly 0.01 to 0.05 μm
m is preferred. The mixing ratio of the optical semiconductor powder and the adsorption material is
In order to suitably exhibit the sterilizing and deodorizing effects, etc., the adsorbing material is preferably 1 to 50 parts by weight, particularly preferably 10 to 30 parts by weight, per 100 parts by weight of the optical semiconductor powder.

The raw material of the thermal spray coating containing hydroxyapatite is, for example, 80% by weight of TiO ₂ , Ag10
% By weight and 10% by weight of hydroxyapatite are preferred.

FIG. 2 shows the photocatalyst particles 4 applied on the substrate 1.
The photocatalyst particles 4 are composed of titanium oxide particles 4a and silver particles 4b carried on the titanium oxide particles 4a. The photocatalyst particles 4 are shown in FIG.
Can have the same structure as the particles in the case of the low-temperature spraying method shown in FIG. That is, silicon Si can be used as the metal electrode.

The photocatalyst particles 4 are coated with hydroxyapatite 5 as an adsorbent, and further adhered to the surface of the substrate 1 by a binder 6.

Titanium oxide (TiO ₂ ), which is all in the form of anatase crystal, has an extremely strong oxidizing power and makes the substrate tattered. Therefore, even in printing inks or paints, the titanium oxide particles, which are the raw materials, are anatase and rutile. The weight ratio is preferably 20 to 50%: 50 to 80%. If the ratio of anatase is lower than this, the photocatalytic action is weak, and if the ratio is higher than this, the photocatalytic action is too strong to decompose the binder 6 to decompose the ink or paint. Will be immediately decomposed. Most preferably, the weight ratio of anatase to rutile is about 3: 7.

The titanium raw material does not necessarily need to be anatase and rutile, and a suitable photocatalyst can be obtained by adjusting the comparison between an anatase having a strong catalytic activity and an anatase having a weak catalytic activity.

The printing ink contains at least a colorant and a vehicle as a binder 6 in addition to an optical semiconductor powder, a metal powder and an adsorbing material, and further contains other components as necessary.

As the colorant, those generally used as colorants for printing inks, for example, in addition to inorganic pigments and organic pigments,
Dyes such as oil-soluble dyes and disperse dyes can be used. Examples of the vehicle include oils, for example, drying oils such as linseed oil, semi-dry oils such as soybean oil, and non-drying oils such as castor oil.Resin, for example, rosin, modified rosin, natural resin such as gilsonite, or the like. Natural resin derivatives, phenolic resins,
Alkyd resin, xylene resin, urea resin, melamine resin, polyamide resin, acrylic resin, epoxy resin, ketone resin, petroleum resin, vinyl chloride resin, polyvinyl acetate, urethane resin, chlorinated polypropylene, chlorinated rubber, cyclized rubber, Examples thereof include a cellulose derivative and a reactive resin, and further include a plasticizer. Further, as other components, natural or synthetic wax components, desiccants, dispersants, wetting agents, crosslinking agents, gelling agents, thickeners, anti-skinning agents, stabilizers, matting agents,
Examples include an antifoaming agent, a color separation inhibitor, a photopolymerization initiator, and a fungicide. There is no particular mixing ratio of each of these components, and the same mixing ratio as that of a printing ink which is generally commercially available can be applied.

The total amount of the photosemiconductor powder, the metal powder and the adsorbing material in the printing ink is 3 to 55% by weight based on the total amount of the printing ink in order to exert effects such as sterilization and deodorization and to secure appropriate printability. Preferably, it is particularly preferably 15 to 35% by weight.

The form and type of such printing inks are not particularly limited, and may be paste inks, solvent inks, or solvent-free inks, which are lithographic printing inks, letterpress printing inks, gravure printing inks, screen printing inks, and the like. It can be applied as intaglio printing ink and special printing ink. Among these, to achieve the object of the present invention most effectively, screen ink for paper,
Screen printing inks, such as plastic screen inks, glass screen inks, and fabric screen inks, are preferred.

The paint contains, in addition to the optical semiconductor powder, the metal powder and the adsorbing material, at least a film forming component as the binder 6 and a dispersant, and if necessary, other components.

The coating film forming components include cellulose derivatives, phthalic acid resins, phenol resins, alkyd resins, amino ald resins, acrylic resins, epoxy resins, urethane resins, vinyl chloride resins, silicone resins, fluorine resins, emulsions, and water-soluble resins. And the like. Examples of the dispersant include petroleum solvents, aromatic solvents, alcohol solvents, ester solvents, ketone solvents, cellosolve solvents, inorganic silicon solvents, water and the like. When a powder coating is used, a solvent as a dispersant is not required. Other components include pigments, for example, inorganic pigments such as titanium dioxide, graphite, red iron oxide, chromium oxide, and carbon black; organic pigments such as Hansa Yellow, Nova Palm Orange, quinacridone violet, and copper phthalocyanine; Examples include extender pigments such as calcium, barium sulfate, talc, clay, and white carbon, and special functional pigments represented by anticorrosive pigments such as zinc chromate, strontium chromate, zinc phosphate, and aluminum phosphate. Further, in addition to the above components, as auxiliary materials, desiccants for imparting coating film accelerating properties, pigment dispersants, anti-flooding agents, pigment sedimentation inhibitors, and additives for adjusting the fluidity of paints. Viscous agent, thixotropic agent, anti-drip agent, leveling agent for the purpose of coating surface adjustment, defoamer,
In addition to anti-repellent and anti-floating agents, plasticizers,
An anti-skinning agent, an auxiliary for electrostatic coating, an anti-scratch agent, an anti-blocking agent, an anti-UV agent, an anti-staining agent, an antiseptic, a fungicide and the like can be added. There is no special mixing ratio of each of these components, and the same mixing ratio as that of a commercially available paint can be applied.

The total amount of the photosemiconductor powder, metal powder and adsorbing material in the paint is 3 to 55% of the total amount of the paint in order to exert effects such as sterilization and deodorization and to secure appropriate paintability.
% By weight, and particularly preferably 15 to 35% by weight.

The optical semiconductor powder and the metal powder (Ag)
The weight ratio of the adsorption material (hydroxyapatite) is 7
0 to 80% by weight to 10 to 20% by weight is preferred.

The method of applying such a paint is not particularly limited, and methods such as brush coating, air spray coating, electrostatic coating, powder coating, electrodeposition coating, curtain flow coating, and roll coating are applied. be able to.

The composition ratio of the paint used by the applicant is as follows.

1) Acrylic lacquer paint

[Table 1]

2) Liquid urethane paint (in the coating film when dried) 30% photocatalyst, binder solid content 7
0%.

[Table 2] At the time of coating, the main agent and the curing agent are mixed in a ratio of 4: 1.

3) Baking acrylic paint (in the film when dried) 30% photocatalyst, binder solid content 7
0%.

[Table 3]

4) Aqueous acrylic paint (in the coating film when dried) 50% photocatalyst, solid content of binder 5
0%.

[Table 4]

In general, the photocatalyst is a non-eluting system, and the metal carried on the photosemiconductor powder acts as an electrode, which does not elute in the liquid and sterilizes it, but generates OH generated in the presence of water. ^- is intended to exert a bactericidal effect by radical. On the other hand, a conventional dissolution type antibacterial agent, for example, a mixture of an antibacterial agent composed of a zeolite carrying a metal such as silver, copper, and zinc having antibacterial properties and a binder and dried at a required place As shown in FIG. 3, the metal immediately elutes into the liquid and exhibits immediate effect, but the effect is reduced in a short time, and the part where the metal is eluted becomes a nest of bacteria and causes harm instead. Becomes

As shown in FIG. 3, the photocatalyst functional body of the present invention may be inferior to the conventional antibacterial agent in terms of immediate effect, but it is almost non-elutable, so that it hardly dissolves in the liquid. And the effect will last for a long time.

Therefore, a conventional antibacterial agent, for example, zeolite fine particles carrying metal ions (Ag, Cu, Zn) having an antibacterial action is mixed with photocatalyst particles (TiO ₂ + Ag) and subjected to low-temperature spraying or the like. If zeolite fine particles carrying the above metal ions are mixed in a binder and used as a printing ink or paint, it can be used as a quick-acting and long-lasting antibacterial and bactericidal agent.

Next, depending on the object when using the photocatalyst,
It may be necessary to control the intensity of the photocatalytic action, but factors that weaken the photocatalytic function include various metal ions or higher fatty acids. That is, when metal ions such as silver ions are introduced into the processing solution, or when mineral water or the like in which the metal ions are ionized is injected, the photocatalytic function is reduced. In the case of a skin disease, if an ointment or cream, which is a higher fatty acid, is applied thinly to the affected area, and then a towel to which a photocatalytic functional body is attached is applied, the antibacterial action of the towel decreases. In these cases, radicals (OH
^- ) Is trapped by metal ions and higher fatty acids.

Conversely, factors that enhance the photocatalytic function include:
Hydrogen peroxide (H_TwoO_Two), Ozone (O _Three) And UV rays
Exist. When these factors are added to the treatment target, radicals
(OH^-) Occurs at an accelerated rate and significantly enhances the catalytic action
Let me know. That is, H_TwoO_TwoOr O_Three1% for processing
Addition of only a few ppm accelerates the photocatalysis. Also,
H_TwoO_TwoOr O_ThreeTogether with the photocatalyst
It may be provided in the processing object. For example, PbO_TwoAnd precious metals
Or noble metal oxides (which do not normally elute)
Poles and H on the surface_TwoO_Two, O_ThreeIs generated, the processing target
Can give a strong photocatalysis.

Further, forming a film in which gypsum particles (CaSO ₄ ) are mixed with a photocatalyst in the form of thermal spraying or paint or ink is effective for decomposing ethylene gas (C ₂ H ₄ ).
Such a film is effective in keeping vegetables and fruits fresh,
If vegetables and fruits are wrapped with wrapping paper (paper, cloth, etc.) on which such a film is formed, they can be kept fresh for a long time.

In general, ceramics are excellent as a substance that emits far-infrared rays. However, the coating of the TiO ₂ powder, which is a photocatalyst functional body of the present invention, by a low-temperature spraying method has a radiation characteristic close to a black body. It also functions as a good far-infrared radiation coating. For far-infrared radiators, the ratio of anatase to rutile is not critical, and low-temperature sprayed coatings do not necessarily require apatite as an absorber and metal as an electrode in a photocatalyst. Since the photocatalytic functional body of the present invention uses a fine powder before radiation, a dense film can be obtained and a material having good surface roughness is formed, so that the actual radiation area is large and the emissivity is good.
The large surface area of the coating and the large actual emission area mean that the photocatalyst functions as a favorable photocatalyst because contact with the object to be treated is required.

In the case of a photocatalyst, when the substrate is a metal plate, a metal as an electrode is not always necessary.

[0040]

EXAMPLES Specific applications of the above-mentioned photocatalyst functional body will be described below.

1) Usage Form As described above, the photocatalyst functional body of the present invention is intended to effectively act the photocatalytic function while protecting the base material by reducing the ratio of the anatase crystal form. The usage form is as follows. (A) A photocatalytic film is formed by printing, coating (dipping), or low-temperature spraying on the surface of a substrate such as paper, nonwoven fabric, cloth, or metal plate (FIG. 4).

Examples of this type of application include underwear for children, towels, diapers, bibs, pajamas, and even sheets for hospitals where the propagation of various bacteria is a problem for fabrics.

When a photocatalyst film is formed on a metal plate,
It can be used as a wall material for kitchen wall boards, floor boards, food storage for hygiene management, medical equipment, storage, and the like.

As a modification of this type, it is conceivable that a release paper is attached to a photocatalyst sheet of a certain size and used for use.

For example, as shown in FIG. 5, a photocatalytic film 21 is formed on a polyester nonwoven fabric 20 by a low-temperature spraying method, a release paper 23 having an adhesive 22 is adhered to the back side thereof, and the release paper 23 is peeled off at the site to remove the wall. Or paste it on. It is conceivable to use it as a small one of a certain size for a bandage for body treatment. The base material is not limited to the PET nonwoven fabric, but may be, for example, a stainless plate having a thickness of about 100 μm. With respect to such a photocatalyst functional body, a photocatalytic stainless steel sheet of a certain size is brought to the site, where the release paper is peeled off and adhered to floors and walls of a food plant.

As described above, as a method of forming a photocatalytic film on a sheet-like substrate, as described above, there are a method of coating as a paint, a method of forming by printing, and a low-temperature spraying method. Does not require a binder, and may or may not include an adsorbent like apatite. In the case of paint or printing ink,
Since a binder is required, the photocatalyst particles are buried in the binder and the photocatalyst particles in contact with the object to be treated become smaller, so that the catalytic action is weaker than that in the low temperature spraying method without the binder. Therefore, an adsorbent such as apatite is required to compensate for the weak point. (B) A photocatalytic layer is formed on a porous ball 30 made of ceramic or the like by a low-temperature spraying method (FIG. 6). In particular, the ball 30 is desirably made of a material having a specific gravity smaller than that of water and floating on the water surface. (C) Instead of a sheet-like substrate, apply it to a fixed wall such as a wall, or a surface 40 of a container or sanitary instrument (surgical instrument such as a scalpel) having a specific shape depending on the application, The coating 41 is formed by a thermal spraying method.

2) Specific Applications Next, specific applications utilizing the antibacterial performance (organic substance decomposition performance), deodorizing performance, and far-infrared performance of the photocatalytic functional body of the present invention will be described. (A) The photocatalyst of the present invention is a food poisoning Escherichia coli (O-15)
7) Demonstrates antibacterial effects against athlete's foot bacteria (white bacillus), secondary atopic disease (Staphylococcus aureus), hospital-acquired infection (methyricin-resistant Staphylococcus aureus), and bedsores (Pseudomonas aeruginosa) in elderly and sick people And no harm to human skin.

Therefore, as shown in FIG. 8, if the continuous sheet-shaped gauze is dipped in a tank storing paint, or a photocatalyst is adhered to the sheet-shaped gauze by printing to form a mask 50, the influenza is obtained. Suitable for prevention.

FIG. 9 shows a sterile cloth 60 applied to the face for acne and atopic dermatitis. In this sterile cloth 60, openings 61 are formed so that the nose and eyes are exposed when the sterile cloth 60 is applied to the face. Is provided. This sterile cloth 60 may be a PET non-woven cloth or a cloth for towels. In the case of a PET non-woven fabric, a low-temperature spraying method is preferable, and in the case of a cloth for towels, the color pattern 62 is preferably printed with printing ink. The photocatalytic function body of the present invention is a non-eluting type, and since the film component hardly dissolves, the effect is long-lasting.However, the film may fall off after washing many times, so it is necessary to add a color pattern. If this is the case, it is convenient to display when the film has fallen.

Further, as shown in FIG. 10, if a photocatalytic coating film is applied by dipping to a sock 70 having a finger insertion portion 71 where a finger formed corresponding to a toe is separated, it is effective for treating athlete's foot. is there. In addition, as an athlete's foot treatment tool, FIG.
As shown in FIG. 1, a PET nonwoven fabric on which a photocatalytic film is formed may be formed as the toe insert 80, and the toe insert 80 has partition walls 81, 81. . Photocatalytic films are formed on both sides of the partition wall 81.

It is effective to apply a bedsores treatment mat 90 to which a photocatalyst is attached to an affected part for treating patients' bedsores. The photocatalyst may be attached to a part of the underwear that comes into contact with a part where the bedsore occurs, such as underwear or pajamas worn by the patient.

Further, a photocatalytic film may be formed on the suspension ring 100 (FIG. 13) of a train contacted by a public expecting an antibacterial effect by low-temperature spraying or painting, and a railing 110 of a train (FIG. 1).
4) Alternatively, a photocatalyst may be formed on the surface of an escalator handrail (not shown).

As shown in FIG. 31, there is a screen 300 which utilizes the action of decomposing dirt such as oil, and a photocatalyst is attached to the frame 301 and the screen 302 by painting or dipping. FIG. 32
If a photocatalytic film is formed on the fan 311 of the ventilation fan 310 which is easily contaminated as shown in FIG. Furthermore, if a photocatalytic film is formed on a fan or the like of a heat exchanger provided in the main body 321 of the outdoor unit 300 of the cooler, dust is less likely to adhere to the fan 311. (B) When deodorizing and antibacterial effects are required, for example, a photocatalyst is attached to the insole 120 shown in FIG. 15 or a slipper (not shown) by dipping or the like.

When it is desired to eliminate the smell of tobacco, for example, a photocatalyst may be attached to the ceiling 130 of a passenger car, the cover 131 of a seat, or the like, as shown in FIG. If you attach a photocatalyst,
The "dust" of the tobacco is decomposed and the dirt and smell disappear.

Further, in order to eliminate the smell of sweat, as shown in FIG. 18, the surface 150 of the kendo, the body 151 and the gloves 152 are used.
In particular, a photocatalyst may be attached to the inner surface by spray coating or the like. Further, as shown in FIGS.
If the inner surfaces of the wigs 160 and 161 in contact with the head are coated with photocatalyst, the smell of sweat disappears.

It is also preferable to form a photocatalyst film on the surface of the horseshoe-shaped toilet seat 170 as shown in FIG. 21 for antibacterial and deodorizing purposes. As shown in FIG. If a photocatalyst is formed on the peripheral surface of the base 182 by means such as dipping, the odor peculiar to dentures can be eliminated and other teeth can be effectively prevented from becoming decayed. Further, as shown in FIG. 23, if a photocatalytic film is formed on the handle 191 of the toothbrush 190, particularly on the planting portion 192 where the brush is planted, the deodorizing and antibacterial effects can be effectively exhibited. (C) Next, the water treatment will be described.

The photocatalyst functional body of the present invention is, for example, shown in FIG.
26, if immersed in water in the form shown in FIG. 26, the water does not rot because the generation of water moss is suppressed and various bacteria in the water are killed, and the water is ionized by the generation of radicals in the water, Is increased by 0.3 to 0.5 to produce alkaline ionized water. Therefore, drinking water is preferable for health because of alkali and also suitable for plants and the like.

FIG. 24 shows a photocatalyst unit 200 disposed in the water circulation path. This unit 200 is attached to and detached from a cylindrical transparent casing 201 (preferably transparent so that light enters inside). It comprises end closures 202 and 203 which can be freely attached. The casing 201
Is provided with a rectifying plate 204 having a large number of openings regularly, and a filter plate 205 for removing underwater dust is provided inside the rectifying plate 204. A current plate 209 is also provided on the water discharge side of the casing 201.
Is installed. A photocatalyst body 206 is accommodated in the casing 201. The photocatalyst body 206 has a photocatalyst attached thereto and is formed of a plurality of circularly wound PET nonwoven fabrics 20.
207... 207 (formed by a low-temperature thermal spraying method, apatite as an adsorbent may or may not be present), and a mesh 208 as a spacer provided between the PET nonwoven fabrics 207. I have.

As shown in FIG. 26, the photocatalyst 21
As 0, a photocatalyst layer may be formed on a coarse cloth in the casing 211 in a direction perpendicular to the flow direction of water, and meshes 213, 213,... 213 may be inserted between the cloths.

As shown in FIG. 27, in the system for supplying drinking water through the water tank 220, the water tank 2
If a photocatalyst film is formed on the inner wall of the inside 20 or the plate-like (cloth-like) bodies 221, 221... 221 to which the photocatalyst is attached are held in the water tank 220, good drinking water can be supplied from the faucet 225. Incidentally, a photocatalyst unit 224 as shown in FIGS. 24 and 26 can be provided in the middle of the water pipe 223.
By doing so, the generation of rust on the water pipe can be effectively prevented.

FIG. 28 shows a cooling tower 230 for a building.
In the cooling tower 230, water is circulated to cool air for air conditioning. In order to prevent contamination of the circulating water, a photocatalyst unit 231 as shown in FIGS. And is effective. It is also effective to form a photocatalytic film on the inner surface of the water pan 232. In addition, by circulating water from the pond or circulating water from the fish cultivation pond, inserting a cloth or unit with a photocatalyst in the pond can effectively prevent fish diseases and generate water moss. Can be effectively prevented.

In order to effectively prevent the occurrence of water moss, etc.
As shown in FIG. 9, the ceramic photocatalytic ball 30 floating in water may be floated on a horizontal surface such as a pond or a water tank. As described above, if the photocatalyst ball 30 is floated on water, the light satisfactorily hits the photocatalyst skin, and the scales adhering to the ball 30 itself are decomposed, so that the ball 30 can be self-cleaned.

As shown in FIG. 30, a colored photocatalyst coating is applied to the peripheral surface of the porous ball 240 submerged in water, and if it is submerged in a light-transmitting vase or the like, water stains can be removed. It can be effectively prevented and cut flowers last longer because it becomes alkaline ionized water. The above-mentioned ball 30 that floats on the water may float on the water surface. Aquarium for goldfish etc. (usually transparent)
If the colored ball 240 is submerged at the bottom, a decorative effect can be expected in addition to the photocatalytic action.

Further, the photocatalytic film formed by the low-temperature thermal spraying method has sterilization and heat resistance, and can be applied to the surface of shafts of food plants or medical instruments.

[0065]

As described above, the photocatalyst functional body of the present invention does not violate the base material and has good bactericidal and deodorizing properties by appropriately setting the ratio of anatase to rutile. And can be made extremely versatile.

[Brief description of the drawings]

FIG. 1 is a coating state diagram by a body temperature spraying method.

FIG. 2 is a diagram showing a state of a film formed by paint or printing ink.

FIG. 3 is a diagram showing a comparison between the effect of a conventional photocatalyst and the effect of the present invention as a photocatalyst.

FIG. 4 is a perspective view in which a photocatalyst is attached to a sheet-like substrate.

FIG. 5 is a cross-sectional view of a photocatalyst functional body having a fixed size provided with release paper.

FIG. 6 is a perspective view in which a photocatalyst is supported on ceramic balls.

FIG. 7 is a diagram in which a photocatalyst is attached to an object having a fixed shape.

FIG. 8 is a perspective view of a mask to which a photocatalyst is attached.

FIG. 9 is a perspective view of a sterile cloth to which a photocatalyst is attached.

FIG. 10 is a perspective view of a sock to which a photocatalyst is attached.

FIG. 11 is a perspective view of a toe insert having a photocatalyst attached thereto.

FIG. 12 is a perspective view of a bedsore treatment mat to which a photocatalyst is attached.

FIG. 13 is a perspective view of a suspension ring to which a photocatalyst is attached.

FIG. 14 is a perspective view of a handrail to which a photocatalyst is attached.

FIG. 15 is a perspective view of a shoe insole with a photocatalyst attached.

FIG. 16 is a perspective view of a passenger car to which a photocatalyst is attached.

FIG. 17 is a perspective view of a non-smoking car to which a photocatalyst is attached.

FIG. 18 is a perspective view of a kendo tool to which a photocatalyst is attached.

FIG. 19 is a perspective view of a wig to which a photocatalyst is attached.

FIG. 20 is a perspective view of a wig to which a photocatalyst is attached.

FIG. 21 is a perspective view of a toilet seat to which a photocatalyst is attached.

FIG. 22 is a perspective view of a denture with a photocatalyst attached thereto.

FIG. 23 is a perspective view of a toothbrush having a photocatalyst attached thereto.

FIG. 24 is a structural diagram of a photocatalytic unit for water treatment.

FIG. 25 is a cross-sectional view of a photocatalyst stored in the photocatalyst unit.

FIG. 26 is a structural diagram of another photocatalytic unit for water treatment.

FIG. 27 is a structural view in which a photocatalyst is incorporated in a water supply system.

FIG. 28 is a configuration diagram in which a photocatalyst is incorporated in a water circulation path of a cooling tower.

FIG. 29 is a structural view when a ceramic ball with a photocatalyst floating on water is put in a water tank.

FIG. 30 is a configuration diagram of a vase incorporating a photocatalyst.

FIG. 31 is a front view of a screen door to which a photocatalyst is attached.

FIG. 32 is a perspective view of a ventilation fan having a photocatalyst attached thereto.

FIG. 33 is a perspective view of an outdoor unit of a heat exchanger to which a photocatalyst is attached.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Base material 2, 4 ... Photocatalyst particles 6 ... Binder 23 ... Release paper 30 ... Ball 50 ... Mask 60 ... Sterile cloth 81 ... Partition wall 90 ... Bedsore treatment mat 180 ... Dentures 190 ... Toothbrush 230 ... Cooling tower

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) // A01N 59/00 A01N 59/00 B 4K031 F term (reference) 4C058 AA02 AA05 AA07 AA08 AA12 AA13 AA19 AA20 AA23 AA26 AA30 BB02 CC08 JJ03 JJ04 JJ23 4G047 CA05 CB05 CC03 CD07 4H011 AA02 BA01 BB18 BC18 BC19 DA23 DH02 DH05 4J038 HA066 HA216 KA20 PC02 PC03 PC08 PC10 4J039 AB07 BA04 BA13 BA18 BA19 BA20 BA26 BA31 BA35 BA36 BA37 FA39 CB01 FA33 CB50 DA01 EA02 EA10

Claims (2)

[Claims] 1. Rutile-type crystal titanium oxide (TiO ₂ )
Is sprayed onto a substrate by a low-temperature spraying method to form an anatase type crystal of 10 to 40% by weight and a rutile type crystal of 60 to 90%.
A photocatalyst functional body characterized in that a photocatalyst film of weight% is formed on a substrate. _2. Anatase-type crystal particles 20 to 50% by weight of titanium oxide (TiO ₂ ) and rutile-type crystal particles 5
A photocatalyst functional body obtained by coating or printing a base material with a paint or printing ink formed by mixing 0 to 80% by weight, metal fine particles, and ceramic fine particles as an adsorbent in a binder.