JPH09225263A - Air pollutant removing filter, air pollutant removing fan and ventilator using the fan - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air pollutant removing filter, etc., capable of excellently removing a chemical-change product by water washing and effectively removing the material to be treated over a long period. SOLUTION: This air pollutant removing filter 13 consists of an air-permeable base material with a photocatalyst-contg. layer formed on its surface, and the surface is hydrophilc with the contact angle to water controlled to 5 deg.. When the filter 13 is irradiated with an outdoor light (or the light of a UV lamp), the air pollutant is photocatalytically caught by the filter surface. Since the filter 13 surface is hydrophilic, the photocatalytic chemical change product is removed naturally with rainwater or by periodical water washing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air pollutant removal filter, a fan for removing air pollutants, or a ventilation device having a function of chemically changing and capturing and removing pollutants in the air by photocatalytic action. In particular, the present invention relates to an air pollutant removal filter, an air pollutant removal fan, or a ventilation device that has excellent removability of a chemical change product by washing with water and can effectively remove a target substance for a long period of time.

[0002]

2. Description of the Related Art In a ventilation fan for taking in outside air in urban areas, it is necessary to remove harmful air pollutants such as NO _x and SO _x and odorous substances before taking in outside air for the health of residents and the living environment. preferable. The most popular conventional ventilation fan filter having such an air pollutant removal function employs a method of adsorbing and removing the above air pollutants by activated carbon. Therefore, when the adsorbed amount of the activated carbon used is saturated, the function of removing air pollutants is not exerted, and it is necessary to replace the activated carbon or the entire filter.

On the other hand, a method of decomposing and removing air pollutants by a photocatalyst is conventionally known (Japanese Patent Laid-Open No. 6-31).
5614). Further, an air purifier that purifies indoor air with a photocatalyst or a photocatalyst and activated carbon (Japanese Patent Laid-Open No. 3-607).
20) and a ventilation device (JP-A-7-280314).

[0004]

However, when the method of Japanese Patent Laid-Open No. 6-315614 is applied to an indoor unit such as a ventilator, nitric acid produced by decomposition of NO _x or SO _x is produced. Since it does not have an effective means of removing sulfuric acid from the photocatalyst surface, it leads to a decrease in photocatalytic activity when used for a certain period of time. In addition, since undegraded substances such as oil smoke will also be adsorbed, the photocatalytic activity is further reduced, and the light-shielding effect by the attached substances is also added, so that it is considered that the functional degradation is accelerated. Such a problem is caused by the air cleaner disclosed in JP-A-3-60720 and the JP-A-7-60720.
It is also common to the -280314 ventilation system.

When a filter or the like having an air pollutant removing function based on a photocatalytic action becomes dirty, the function can be restored by washing the filter and the like. However, a highly active photocatalyst is immobilized on a substrate at a relatively low temperature,
Since it is usually a porous body and it is difficult to firmly fix it to the substrate, if the surface of the filter to which the photocatalyst substance is attached is washed using a brush or the like, the photocatalyst substance layer easily falls off due to the brushing force, There was a problem that the function deteriorated.

The present invention provides an air pollutant removal filter, an air pollutant removal fan, or a ventilation device which has excellent removability of a chemical change product by washing with water and can effectively remove a target substance for a long period of time. With the goal.

[0007]

First, the present inventor has found that there is a relationship shown in FIG. 7 between the property of a substance adhering to the surface of a member and the contact angle of the surface of the member with water. I found it. The horizontal axis in FIG. 7 represents the contact angle between the surface of the member and water, and the vertical axis represents
Indicates the degree of stains on the surface of the member after repeated washing and drying. With respect to hydrophilic stains, there is little stain when the contact angle is around 0 ° and 80 ° or more. Regarding amphoteric substance stains, there is little stain at contact angles of 20 ° or less and 140 ° or more.
Contact angle 60 ° or less and 180 ° for hydrophobic stains
There is little dirt in the vicinity. From FIG. 7, after all, in order to obtain a surface on which deposits of all properties can be washed cleanly with water, a superhydrophilic surface having a contact angle with water of less than 5 ° (see Example 5 described later) is used, or the same angle is used. It turns out that it is necessary to have a superhydrophobic surface close to 180 °. That is, when the superhydrophilic surface has a contact angle with water of less than 5 °, the attached decomposition products can be effectively removed regardless of the nature of the attached material. According to this method
Not only when the object is a dense body but also when it is a porous material such as a breathable filter, if the filter material is hydrophobic, the material repels water even if it is washed with water, and the water is left in the pores. The contaminants clogged in the pores cannot be removed because they do not enter, whereas the superhydrophilized one exhibits the effect that the contaminants in the pores can be easily removed by washing with water.

Secondly, the present inventor has found that when an optical semiconductor such as titanium oxide is present on the surface of a member, the surface is irradiated with photons having an excitation wavelength or less to generate conduction electrons and holes. It was found that the surface hydrophilicity is maintained / restored, probably due to the surface polarity.
Therefore, when an optical semiconductor such as titanium oxide is present and a certain condition as exemplified in the embodiment of the invention is satisfied, when the surface of the member is irradiated with the above light, the contact angle with water on the surface becomes It is possible to maintain and recover the superhydrophilic state of less than 5 °.

That is, the filter for removing air pollutants of the present invention comprises an air-permeable base material having a photocatalyst-containing layer formed on the surface thereof, and the surface is hydrophilic and has a contact angle with water of less than 5 °. It is characterized by being.

Further, the fan for removing air pollutants of the present invention has blades made of a base material having a photocatalyst-containing layer formed on the surface thereof, and has a hydrophilic surface having a contact angle with water of less than 5 °. It is characterized by being.

Further, the ventilation device of the present invention has the above-mentioned filter for removing air pollutants and / or a fan for removing air pollutants, and the filter and / or fan is arranged in a state in which it can be irradiated with outdoor light. Or a means for irradiating the filter and / or the fan with ultraviolet rays is provided.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION

(1) The following may be mentioned as a method of forming a superhydrophilic surface in which the contact angle between the member surface and water is less than 5 °. This is a method of forming a layer composed of titanium oxide and tin oxide on the surface of a member. As a method of forming such a layer,
For example, titanium oxide sol and tin oxide sol are mixed, applied to a base material, and baked. This is a method of forming a layer composed of titanium oxide and silicon oxide on the surface of a member. As a method of forming such a layer, for example, titanium oxide sol and colloidal silica are mixed, coated on a base material, and baked.

This is a method of forming a mixed layer composed of titanium oxide and a silicone resin on the surface of a member, and then irradiating a photon having an excitation wavelength or less to change the silicone resin present on at least the outermost surface of the mixed layer to hydroxysiloxane. As a method for forming such a layer, for example, first,
Organoalkoxysilane and titanium oxide are mixed and coated on a substrate, and the organoalkoxysilane is hydrolyzed and dehydrated and polycondensed to form a mixed layer of polyorganosiloxane and titanium oxide. Then, photons having an excitation wavelength or less are irradiated to replace at least the outermost organo group of the mixed layer with a hydroxyl group.

Here, the silicone resin contains a hydrolyzed condensate of silane having 2 to 4 hydrolyzable groups. Examples of the hydrolyzable silane as the raw material are methyltrichlorosilane, methyltribromosilane, methyltrimethoxysilane, methyltriethoxysilane, methyltriisopropoxysilane, methyltri-t-butoxysilane, ethyltrichlorosilane, ethyltribromosilane, ethyltrimethoxysilane, and ethyl. Triethoxysilane ethyltriisopropoxysilane n-propyltrichlorosilane n-propyltribromosilane n-propyltrimethoxysilane n-propyltriethoxysilane n-propyltriisopropoxysilane n-hexyltrichlorosilane n-hexyltribromosilane n -Hexyltrimethoxysilane n-hexyltriethoxysilane n-decyltrimethoxysilane n-decyltriethoxysilane n-octa Syltrimethoxysilane n-octadecyltriethoxysilane Phenyltrichlorosilane Phenyltribromosilane Phenyltrimethoxysilane Phenyltriethoxysilane Tetrachlorosilane Tetrabromosilane Tetramethoxysilane Tetraethoxysilane Tetrabutoxysilane Dimethoxydiethoxysilane Dimethoxydiethoxysilane Dimethyldi Chlorosilane Dimethyldibromosilane Dimethyldimethoxysilane Dimethyldiethoxysilane Diphenyldichlorosilane Diphenyldibromosilane Diphenyldimethoxysilane Diphenyldiethoxysilane Phenylmethyldichlorosilane Phenylmethyldibromsilane Phenylmethyldimethoxysilane Phenylmethyldiethoxysilane Trichlorohydrosilane Tribromide Silane Trimethoxyhydrosilane Triethoxyhydrosilane γ-glycidoxypropyltrimethoxysilane γ-glycidoxypropyltriethoxysilane γ-glycidoxypropylmethyldimethoxysilane γ-glycidoxypropylmethyldiethoxysilane β- (3,4 -Epoxycyclohexyl) ethyltrimethoxysilane β- (3,4-epoxycyclohexyl) ethyltriethoxysilane γ- (meth) acryloxypropyltrimethoxysilane γ- (meth) acryloxypropyltriethoxysilane γ- (meth) acry Roxypropylmethyldimethoxysilane γ- (meth) acryloxypropylmethyldiethoxysilane γ-aminopropyltrimethoxysilane γ-aminopropyltriethoxysilane γ-aminopropylmethyldimethoxysilane γ-Aminopropylmethyldiethoxysilane γ-mercaptopropyltrimethoxysilane γ-mercaptopropyltriethoxysilane Vinyltrichlorosilane Silane Vinyltribromosilane Vinyltrimethoxysilane Vinyltriethoxysilane Trifluoropropyltrichlorosilane Trifluoropropyltribromosilane Tri Fluoropropyltrimethoxysilane Examples include trifluoropropyltriethoxysilane and partial hydrolysates thereof. It is preferable to use dialkoxysilane, trialkoxysilane, or tetraalkoxysilane from the viewpoint of easy availability and handling of the raw materials.

(2) The following can be mentioned as a method of further enhancing the photocatalytic (photooxidation) reaction while maintaining the hydrophilicity. Platinum, palladium, ruthenium, gold,
In this method, silver and copper are added to the surface layer of the member and fixed. The reason why these additions have the above effect is to promote the photooxidation reaction while preventing recombination of electrons and holes.
Although it is necessary to generate active oxygen such as hydroxyl radicals generated by the reaction of holes and hydroxide ions (since these active oxygen contribute directly to the oxidation reaction), the above metal effectively traps electrons and regenerates them. It works to prevent binding. Other metals that perform these functions include iron, nickel, and cobalt, but these metals probably have too large an adsorptive property (gas, etc.) and thus deteriorate hydrophilicity.

In the present invention, the photocatalyst containing layer is
It can be fixed to the surface of the substrate through a photocorrosion resistant material. This is because the photocatalytic substance can be more firmly fixed on the substrate. Examples of the photo-corrosion resistant substance include inorganic binders (amorphous silica, water glass, glaze, etc.), silicone resins, fluororesins, acrylic silicones, and the like.

As the structure (shape) of the filter of the present invention, known ones such as mesh, honeycomb and porous plate can be widely used.

Various materials such as plastic, paper, metal, film, vinyl chloride steel plate, alumite-treated aluminum, chromate-treated metal, ceramic paper, and glass fiber non-woven fabric can be used without limitation as the base material of the member having a photocatalytic action in the present invention. it can. You may carry an air pollutant adsorption substance, such as activated carbon, on the surface of a base material, and further provide a photocatalyst containing layer on it. Further, in the case of a filter, the base material itself may be made of activated carbon.

[0019]

EXAMPLES Hereinafter, more specific description will be given with reference to the drawings and experimental examples. FIG. 1 is a schematic cross-sectional view showing the configuration of a ventilation fan having an air pollutant removal filter according to an embodiment of the present invention. The ventilation fan 1 shown in FIG. 1 is fitted into a building wall 3, and includes a filter 13, a fan 15, and a frame 11.
Is provided. The filter 13 is provided so as to spread over the entire flow path of the air inside the ventilation fan 1. The filter 13 is
It is made of a breathable substrate having a photocatalyst-containing layer on its surface, specifically, the material shown as Example 4 described later. The filter 13 is exposed to outdoor light and exhibits the above-mentioned air pollutant removing function and hydrophilicity. Therefore, the air pollutant removal function can be exerted for a long period of time only by natural washing with rainwater or regular washing with water.

FIG. 2 is a schematic sectional view showing a modification of the ventilation fan of FIG. 1 in which the outer frame is made of glass (made of transparent material). Also in this case, the filter 13 is exposed to outdoor light, and the filter exerts an air pollutant removing function based on the photocatalytic action. The ventilation fan in FIG. 2 looks better when viewed from the outside.

FIG. 3 is a sectional view schematically showing the construction of an embodiment of a ventilation fan having an ultraviolet lamp for promoting a photocatalytic action. That is, the ultraviolet lamp 21 is installed between the filter 13 and the fan 15, and the filter 13 is irradiated with ultraviolet rays to further promote the photocatalytic action. Alternatively, it can be applied to a ventilation fan installed in a place where the outdoor light does not hit. Here, the type of the ultraviolet lamp 21 is B
An LB lamp, a mercury lamp, a metal halide lamp, a xenon lamp, etc. can be applied.

FIG. 4 is a cross-sectional view schematically showing a modification of the ventilation fan of FIG. 3 in which filters are arranged on both sides of an ultraviolet lamp. That is, the filter 13a is provided upstream and downstream of the ultraviolet lamp 21 (on the left and right in the figure),
13b is provided. Both filters 13a, 13b
Each is irradiated with ultraviolet rays from the ultraviolet lamp 21. The double structure of the filter enhances the ability to remove air pollutants.

FIG. 5 is a view showing a ventilation fan equipped with a fan having an air pollutant removing function according to an embodiment of the present invention. (A) is an overall sectional view, and (B) is a perspective view of a fan (sirocco fan). The ventilation fan 1-5 has a casing 33, and the casing 33 is fitted in the building wall 13. The front surface 33a (outside) of the casing 33 is open, and the air outlet 33 is opened downward.
b. A frame (lattice) 11 is provided in those openings.

Inside the casing 33, the sirocco fan 3
1 is installed with its air suction portion (center portion) facing the outside air. The sirocco fan 31 rotates in an axial direction perpendicular to the building wall 3 and has a large number of blades 32 arranged radially with respect to the axial direction. These blades 32 are made of a base material having a photocatalyst-containing layer formed on the surface thereof, and the contact angle of the surface with water is less than 5 °. Specifically, it is composed of the members of Example 3 described later. Plates 34 made of a transparent material are attached to the left and right end surfaces of the blade 32 so that the outdoor light is exposed to the blade 32.
It is supposed to hit. The blades 32 (wings) are all flat plates and have the effect of quieting the sound.

When the sirocco fan 31 rotates, the outside air is sucked into the center of the sirocco fan 31, passes through the blades 32 to the outer peripheral side, and enters the room through the air outlet 33b below. When passing through the blade 32, air pollutants in the outside air are removed by the photocatalytic action of the surface of the blade 32. As described above, the vane 32 is exposed to the outdoor light through the transparent plate 34.

FIG. 6 is a schematic perspective view showing a main part of an air pollutant removing fan according to another embodiment of the present invention. Similar to the sirocco fan of FIG. 5, the sirocco fan 31 includes blades 32 made of a base material having a photocatalyst containing layer formed on the surface thereof. Further, an ultraviolet lamp 35 is provided at the center thereof. Each blade 32 is irradiated with ultraviolet rays from the ultraviolet lamp 35 to accelerate the photocatalytic reaction.

[0027]

EXAMPLE A specific example of a method for producing a material for forming the above-mentioned filter or fan blade will be described below. Samples according to Examples 1 to 5 and Comparative Examples 1 and 2 below were prepared. Example 1 Titanium oxide sol (STS11 manufactured by Ishihara Sangyo) and tin oxide sol (manufactured by Taki Chemical Co., Ltd., average crystallite diameter 3.5 nm) were mixed at a solute weight ratio of 85:15. This mixed material was applied to a 15 cm-square glass non-woven fabric (made by Mitsubishi Paper Mills) at a solid content of 100 mg and baked at 150 ° C. for 10 minutes. After that, an aqueous palladium chloride solution was applied, and palladium was photoreduced and immobilized on the surface of the sample by irradiation with ultraviolet rays (condition: 0.5 mW / cm ² for 1 minute).

Example 2 A solute weight ratio of titanium oxide sol (STS11 manufactured by Ishihara Sangyo) and silica sol (Snowtex 20 manufactured by Nissan Kagaku) was set to 8
Mixed at 0:20. This mixture was applied on a 15 cm-square alumina-silica ceramic paper (manufactured by Nichias Co., Ltd.) in a solid content of 100 mg and baked at 500 ° C. for 10 minutes. Then, an aqueous solution of hexachloroplatinic acid (IV) hexahydrate was applied, and platinum was photoreduced and immobilized on the surface of the sample by ultraviolet irradiation (condition: 0.5 mW / cm ² for 1 minute).

Example 3 Tetraethoxysilane was coated on an acrylic plate, and 15
It was heat-cured at 0 ° C. to form an amorphous silica layer. Then, tetraethoxysilane and titanium oxide sol (TA15 manufactured by Nissan Chemical Industries, Ltd.) were mixed at a solute weight ratio of 50:50, and an aqueous solution of hexachloroplatinic acid (IV) hexahydrate was added, and the amount of platinum based on titanium oxide solid content was 2 mol. % Was added. This liquid material was applied onto it and baked at 150 ° C. for 10 minutes.

Comparative Example 1 Alumina-silica ceramic paper (Nichias)
Then, 100 mg of titanium oxide sol (STS11 manufactured by Ishihara Sangyo Co., Ltd.) was applied as a solid content weight, and baked at 500 ° C. for 10 minutes. Then, an aqueous palladium chloride solution was applied, and palladium was photoreduced and immobilized on the surface of the sample by irradiation with ultraviolet rays (condition: 0.5 mW / cm ² for 1 minute) to prepare a sample.

Example 4 Water glass was applied to a porous alumina ceramic paper, and then titanium oxide sol (A6 made by Taki Chemical Co., Ltd.), silica sol (Snowtex 20 made by Nissan Kagaku Co., Ltd.) and hexachloroplatinic acid (IV) hexahydrate were used. A mixed solution with an aqueous hydrate solution was applied and baked at 500 ° C. The NO _x decomposability and water washability (described later in detail) of this sample were good.

Comparative Example 2 Titanium dioxide photocatalyst powder (Degussa p-25) was mechanically mixed with tetrafluoroethylene resin powder in a weight ratio of 6: 4, and this was rolled to form a porous sheet. Was produced. Although the Nox decomposability of this sample was good,
The water repellency was high and the water washability was inferior to any of the examples.
The water washability means the degree to which the sample is removed by immersing the sample in water after applying the oil.

The following items were measured for these samples. Contact angle with water: Measured with a contact angle measuring instrument (manufactured by Kyowa Interface Science Co., Ltd.) after dropping water by about 5 μm for 30 seconds. Maintainability of contact angle with water: The contact angle with water was measured after continuously irradiating a BLB lamp of 0.6 mW / cm ² (ultraviolet illuminance was almost the same as sunlight) for one week.

Gas decomposition rate (S type gas): Methyl mercaptan was put into an 11 liter container at 3 ppm, and the decomposition rate was measured after irradiation with a 0.6 mW / cm ² BLB lamp for 30 minutes. ◯ indicates 70% or more, Δ indicates 30 to 70%, and x indicates less than 30%. Gas decomposition rate (N-based gas): NO, NO ₂ mixed gas (N
3 ppm of O: NO ₂ = 9: 1) was placed in an 11-liter container, and the same measurement and evaluation as in the case of S-based gas were carried out.

Hydrophobic substance removability: Removability of combustion products was measured. Specifically, the degree of soiling of the sample surface was observed when the cycle of spraying hydrophobic carbon black on the sample surface, washing with water, and leaving it was repeated. ○ indicates that the stain is not noticeable, and × indicates that the stain is noticeable.

Removability of hydrophilic substances: Removability of inorganic stains was measured. Specifically, a suspension in which the yellow ocher-containing material is dispersed is poured onto a sample surface inclined at 45 °, dried,
When the cycle of washing with water and drying was repeated, the degree of contamination on the sample surface was observed. ○ indicates that dirt is not noticeable,
X indicates that the stain is conspicuous.

The measurement results are summarized in Table 1.

[0038]

[Table 1]

As can be seen from Table 1, in each of the examples, the contact angle with water was 0 °, which showed extremely high hydrophilicity. Furthermore, this hydrophilicity remained high even after 1 week of UV irradiation. On the other hand, in each comparative example, the contact angle with water was 5 ° or more.

Gas (methyl mercaptan) and NO, N
Regarding the decomposition rate of the O ₂ mixed gas, the examples and the comparative examples 1 and 2 containing titanium oxide were good. The hydrophobic substance removability was good in each Example and Comparative Example 1 which was relatively hydrophilic. However, Comparative Example 2 which was relatively hydrophobic was poor. The hydrophilic substance removability was good in each Example and Comparative Example 2 which was relatively hydrophobic. However, Comparative Example 1, which was relatively hydrophilic, was poor.

The condition of the present invention is "contact angle with water is less than 5 °", and an experimental example (Example 5) which is the basis for this is described below. Example 5 A mixture of anatase-type titania sol (STS-11) and colloidal silica sol (Snowtex 20) (the silica content in the solid content is 10% by weight) is 4.5 mg in terms of the solid content and a 15 cm square alumina ceramic plate ( (Made by Nippon Carbide) and baked at a temperature of 880 ° C. for 10 minutes. After that, 0.3 g of an aqueous solution of copper acetate monohydrate having a copper concentration of 50 μmol / g was applied by a spray coating method and then dried, and an ultraviolet ray was irradiated by a BLB fluorescent lamp at an ultraviolet illuminance of 0.4 mW / cm ² for 10 minutes. A sample was obtained by photoreductive precipitation of copper acetate monohydrate.

The contact angle of this sample with water was 4.0 °. Next, the sludge test (hydrophilic stain test) shown below was performed on this sample. First, yellow ocher 64.
1.05 g of 3% by weight, calcined Kanto loam clay 21.4% by weight, hydrophobic carbon black 4.8% by weight, silica powder 4.8% by weight, hydrophilic carbon black 4.7% by weight
A slurry suspended in water at a concentration of 1 / liter was prepared. Next, 150 ml of the above slurry was applied to a sample tilted at 45 degrees and a glazed tile (AB02E01) (comparative example).
To dry for 15 minutes, then 150 ml of distilled water
And allowed to dry for 15 minutes and this cycle was repeated 25 times. The change in color difference and the change in gloss before and after the test were examined.
The glossiness was measured according to Japanese Industrial Standard (JIS) Z8741 and the change in glossiness was obtained by dividing the glossiness after the test by the glossiness before the test.

As a result of the sludge test, the sample of this example showed a favorable change in color difference of 2.0 and a change in glossiness of 81.5%.
On the other hand, regarding the alumina ceramic plate of the comparative example, the contact angle with water was 19.4 °, the color difference change was 4.6, and the gloss change was 6
It was a poor 8.3%. Therefore, the contact angle with water is 5
It was concluded that at less than °, a superhydrophilic surface is obtained that can effectively remove hydrophilic stains.

[0044]

As is apparent from the above description, according to the present invention, air pollutants can be reacted and captured by a photocatalytic action, and chemical reaction products adhering to the surfaces of filters and fans can be easily washed and removed by washing with water. Therefore, it is possible to provide an air pollutant removal filter, an air pollutant removal fan or a ventilation device capable of effectively removing a target substance for a long period of time.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing the configuration of a ventilation fan having an air pollutant removal filter according to an embodiment of the present invention.

2] The outer frame of the ventilation fan in FIG. 1 is made of glass (made of transparent material).
It is a typical sectional view showing the ventilation fan of a modification.

FIG. 3 is a cross-sectional view schematically showing the configuration of an example of a ventilation fan having an ultraviolet lamp that promotes a photocatalytic action.

FIG. 4 is a cross-sectional view schematically showing a ventilation fan in which filters are arranged on both sides of an ultraviolet lamp, which is a modification of the ventilation fan of FIG.

FIG. 5 is a diagram showing a ventilation fan including a fan having an air pollutant removing function according to an embodiment of the present invention. (A)
Is a sectional view of the whole, and (B) is a perspective view of a fan (sirocco fan).

FIG. 6 is a schematic perspective view showing a main part of an air pollutant removal fan according to another embodiment of the present invention.

FIG. 7 is a graph showing the relationship between the property of the substance adhering to the member surface and the contact angle of the member surface with water.

[Explanation of symbols]

 1 Ventilation Fan 3 Building Wall 11 Frame 13 Filter 15 Fan 19 Glass 21 UV Lamp 31 Sirocco Fan 32 Blades 33 Casing 33a Front 33b Air Outlet 34 Transparent Plate 35 UV Lamp

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location B01J 23/14 B01D 53/36 J 23/62 102B 35/02 ZAB 102E

Claims (10)

[Claims] 1. An air pollutant for removing air pollutants, comprising a gas-permeable base material having a photocatalyst-containing layer formed on the surface, the surface being hydrophilic with a contact angle with water of less than 5 °. filter. 2. For removing air pollutants, which has a blade made of a base material having a photocatalyst-containing layer formed on the surface thereof, and is hydrophilic with a contact angle of water on the surface of less than 5 °. fan. 3. The filter for removing air pollutants and / or the fan for removing air pollutants according to claim 1 or 2, wherein the filter and / or the fan are arranged in a state where they can be irradiated with outdoor light. Ventilation device characterized by being. 4. An air pollutant removal filter and / or an air pollutant removal fan according to claim 1 or 2, and means for irradiating the filter and / or fan with ultraviolet rays. Ventilation equipment. 5. The filter for removing air pollutants, the fan for removing air pollutants, or the ventilation device according to claim 1, wherein the surface is hydrophilic with a contact angle with water of approximately 0 °. . 6. The outermost surface of the member is made of a substance containing titanium oxide and tin oxide as main components.
A filter for removing air pollutants, a fan for removing air pollutants, or a ventilator according to the above item. 7. The air pollutant removing filter, the air pollutant removing fan or the ventilation according to claim 1, wherein the outermost surface of the member is made of a substance containing titanium oxide and silicon oxide as main components. apparatus. 8. The surface layer of the member is made of a material containing titanium oxide and silicone resin as main components, and the outermost surface thereof is made of a material containing titanium oxide and polyhydroxysiloxane as main components. The filter for removing air pollutants, the fan for removing air pollutants, or the ventilation device according to any one of claims 1. 9. The air pollutant according to claim 1, wherein at least one of platinum, palladium, ruthenium, gold and silver is added to the substance forming the surface layer of the member. Removal filter, air pollutant removal fan or ventilation system. 10. The filter for removing air pollutants and the fan for removing air pollutants according to claim 1, wherein the photocatalyst-containing layer is fixed to the surface of the base material via a photocorrosion resistant substance. Or a ventilation system.