JP2000102598A - Air purifying membrane and article provided with it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remove a toxic or malodorous substance such as NOx, aldehyde or the like by arranging, in an air purifying membrane to make contact with the indoor or outdoor air, a photocatalytic membrane containing TiO2 on the upstream side to air flow and a photocatalystic membrane containing TiO2 and ZnO on the downstream side. SOLUTION: A photocatalyst 102 consisting of TiO2 fine particles and a photocatalyst membrane 103 consisting of TiO2 fine particles and ZnO fine particles are applied to a filter 101 consisting of acrylic fiber to produce an air purifying filter. In the actual production, as the photocatalyst 102, an acrylic resin is added to a TiO2 fine particle water dispersed solution to produce a coating solution. As the photocatalyst 103, an O2 fine particle water dispersed solution is mixed with a ZnO fine particle water dispersed solution, and the same acrylic resin is added thereto to produce a coating solution. The filter 101 consisting of acrylic fiber is dipped in the coating solution followed by drying and subjected to a required treatment to produce the air purifying filter.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air purification membrane and an article provided with the same, and more particularly to a TiO upstream of an air flow generated by driving an ionizing or electric blower.
₂ is provided, and a photocatalyst film including TiO ₂ and ZnO is provided on the downstream side to remove harmful substances, deodorize, antibacterial, and antifouling. Various filters, air conditioners,
The present invention relates to an air purification film applicable to a vacuum cleaner, an air washer, a ventilation fan, and a cooling / heating device, and an article provided with the same.

[0002]

2. Description of the Related Art Various odorous substances and harmful substances, such as dust, oil particles, smoke from tobacco, pollen, various microorganisms, nitrogen compounds, aldehydes, and sulfur compounds, float in the air in homes and offices. ing. In particular, in recent years, nitrogen oxides (hereinafter referred to as NOx
Formaldehyde generated from building materials
It is one of the causative agents of asthma and allergy, and attention is being paid to its removal.

[0003] Photocatalysts which decompose organic substances such as harmful substances, odorous substances and microorganisms by light energy and which can be used semi-permanently are attracting attention as clean materials, and various products for purifying air using photocatalysts are also available. It has been reported.

As a photocatalytic material, TiO ₂ is known as a stable material having a large photoactive energy and a large decomposing power. As a harmful substance removing material containing TiO ₂ , JP-A-8-117556 discloses It is described in. Further, Japanese Patent Application Laid-Open No. Hei 6-31133 reports an air purification membrane in which a photocatalyst and an adsorbent are combined in order to improve the deodorizing performance of NOx and acetaldehyde. Further, JP-A-9-173862
In JP-A No. 5-2, there is reported a photocatalyst film in which ZnO, which is a photocatalyst material that easily adsorbs an acidic gas, is combined with TiO ₂ .

[0005]

The photocatalyst containing TiO ₂ as a main component, which has been used in the prior art, is excellent in decomposing aldehydes and smoke of cigarettes, but has an acidic surface of TiO _2. Nitrogen dioxide (NO ₂ ), an acidic gas
Is difficult to adsorb. In addition, the combined use with the adsorbent shortens the life of the photocatalytic film because the adsorbent cannot be regenerated. further,
Gas components can be adsorbed when not irradiated with light and then decomposed by irradiating light afterwards, but if not irradiated with microorganisms, microorganisms will propagate with organic dirt as a nutrient source and will be easy to re-light. It is difficult to disassemble. In that regard, it is desirable to use ZnO, which is a photocatalyst material that adsorbs acidic gas and has an antibacterial effect, but ZnO has a bad odor and a weak decomposability against dirt components,
When combined with TiO ₂ , the overall decomposition power is reduced, and it becomes difficult to oxidatively decompose nitrogen monoxide (NO), aldehydes and the like.

An object of the present invention is to use a photocatalyst to convert NO
x, harmful substances such as aldehydes, odorous components, dirt components,
An object of the present invention is to provide a novel air purification membrane for removing microorganisms. Another object of the present invention is to provide an article having the catalyst.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides an air purifying membrane which is brought into contact with indoor or outdoor air by an air flow generated by driving an ionizing or electric blower. Thus, the present invention provides a novel air purification film provided with a photocatalyst film containing TiO ₂ on the upstream side and a photocatalyst film containing TiO ₂ and ZnO on the downstream side.

[0008] In a first configuration of the present invention, the downstream Ti
TiO ₂ : Zn in a photocatalytic film containing O ₂ and ZnO
The composition ratio of O is 90:10 to 50:50. The photocatalyst film on the downstream side contains TiO ₂ , ZnO and an organic resin, and the photocatalyst film on the upstream side is TiO ₂
And an air purification film containing an organic resin.

TiO ₂ has a function as a photocatalyst, and has a function of decomposing organic substances and an antibacterial and deodorizing effect. Its function is caused by electrons and holes generated when TiO _{2 as a} semiconductor is irradiated with light, particularly ultraviolet light. When TiO _2, which is a semiconductor, is irradiated with light having energy equal to or greater than the band gap,
Generates electrons and holes. The generated electrons and holes are Ti
The water adsorbed on the O ₂ surface is decomposed to generate H radicals and OH radicals. By reacting the OH radical with an organic substance, the organic substance can be decomposed.

OH groups are bonded to the surface of the TiO ₂ fine particles,
Many points are acidic due to generation of hydrogen ions, and few base points. Nox, particularly NO gas when in contact with TiO ₂ surface, NO is the NO ₂ is oxidized to TiO _2. NO ₂ is further oxidized to NO ₃ ions,
Since the NO ₃ ions are unstable, most of them return to NO ₂ . N
Since the O ₃ ion is acidic, it is adsorbed at the base site, but almost not adsorbed, and remains in the air as NO ₂ .

On the other hand, ZnO has a shorter band gap and lower decomposing power than TiO ₂ . Therefore, the ability to convert NO into NO ₂ or NO ₃ ions is weak, but there are many basic points on the surface, and it is easy to adsorb NO ₃ ions of acidic gas. In this case, even if the TiO ₂ and ZnO are separately contacted with each other, the TiO ₂ and ZnO are present in the same film because the NO ₃ ions easily return to NO ₂ before reaching the ZnO. There is a need. If there is a large amount of ZnO, NO ₂
The function of oxidizing NO to NO ₃ is also reduced.
As the addition condition, a composition ratio of TiO ₂ : ZnO of 99: 1 to 50:50 was found as a solid composition ratio. Furthermore, Z
Since nO has an antibacterial function, TiO ₂ and Zn
The film with O can have an antibacterial action regardless of light irradiation or non-irradiation.

However, TiO ₂ is superior to ZnO in terms of the performance of the photocatalyst. Therefore, if ZnO is mixed, the performance of the photocatalyst is apparently reduced, and the function of oxidizing NO,
The function of decomposing other odorous components and the antifouling function are reduced. Therefore, in the present invention, a photocatalyst film containing TiO ₂ having a strong oxidative decomposition power is provided before the photocatalyst film having TiO ₂ and ZnO. The TiO ₂ photocatalyst film, harmful substances and the like aldehydes, malodorous components, degradation of soil components, equipped with an antimicrobial effect during the light irradiation, TiO _2, ZnO
With the photocatalytic film, an air purifying film having an antibacterial effect when NO _{2 is} removed and light is not irradiated can be provided.

[0013] The air purification membrane of the present invention comprises various filters,
The air purification film of air conditioners, vacuum cleaners, air purifiers, ventilation fans, cooling and heating equipment, etc. is formed on the surface of the base material that comes in contact with indoor illumination light or sunlight from the outside to enhance the functionality and performance of each article. can do.

Further, the article has an air purifying film on the surface of the base material, and a light source mounted on the air purifying film so that the air purifying film is irradiated with light.
Either D lamp or incandescent lamp.

Further, the filtering member of the article is formed of a plurality of layers, and the air purification film is formed on at least one layer. A member having the air purification film is provided, and one or more of a member having a dust collection function and a member having an adsorption function are provided, and the member having the dust collection function is electret-treated. It is a member. An inorganic coloring pigment is dispersed and compounded in the material of the filtering member provided with the air purification membrane, and the inorganic coloring pigment has a maximum absorption peak in a wavelength range of 400 nm to 700 nm.

[0016] The articles provided by the present invention take in air in the room through an air inlet by an air flow generated by driving an electric blower, pass through a filtering member provided in a ventilation path, and float in the air. An air purifier that collects and cleans dust, oil particles, smoke, pollen, various microorganisms, or foul-smelling substances and harmful gases, and then discharges it through an exhaust port. This is an air purifier in which an air purification film is formed on the surface of a filtering member to be touched.

This air purifier is provided with a light source, and an air purifier in which an air purification film is formed on a surface of the filtering member that comes into contact with light from the light source among the filtering members.
The light source is any one of an ultraviolet lamp, a fluorescent lamp, an LED lamp, and an incandescent lamp.

Further, the filtering member of the air purifier is formed of a plurality of layers, and the air purification film is formed on at least one layer. A member provided with the air purification film, a member having a dust collecting function, or a member having an adsorbing function is provided with one or more members, and the member having the dust collecting function is a member which has been subjected to electret treatment. is there.

The air purifier is provided with a member having a dust collecting function, a member having an air purification film, and a light source in this order from the intake port to the exhaust port.

Further, an inorganic coloring pigment is dispersed and compounded in the material of the filtering member provided with the air purification membrane, and the inorganic coloring pigment has a maximum absorption peak in a wavelength region of 400 nm to 700 nm.

Further, in the present air purifier, the filtering member on which the air purification film is formed is detachable from the air purifier main body.

[0022]

(Example 1) A photocatalyst composed of TiO ₂ fine particles (hereinafter referred to as photocatalyst A) and a photocatalyst film composed of TiO ₂ fine particles and ZnO fine particles (hereinafter referred to as photocatalyst B) are made of acrylic fiber. Each of the filters was applied to a filter to prepare an air purification filter. The procedure is shown below.

Preparation of Coating Solution Photocatalyst A: A coating solution was prepared by adding a predetermined amount of an acrylic resin (Hitachi Chemical: AE8200) to an aqueous dispersion of TiO ₂ fine particles (CII Kasei) as a binder.

Photocatalyst B: A predetermined amount of an aqueous dispersion of TiO ₂ fine particles (Sumitomo Osaka Cement) and an aqueous dispersion of ZnO fine particles (Sumitomo Osaka Cement), and then a predetermined amount of the same acrylic resin as photocatalyst A added as a binder. Was prepared.

Preparation of Filter A filter made of acrylic fiber was immersed in a coating solution, dried, and treated at 120 ° C. for 15 minutes to prepare a filter.

Using the prepared filter, a NOx removal test, a formaldehyde removal test, a tobacco deodorization test, a tobacco soil decomposition test, and an antibacterial test were performed, and the performance of the filter was evaluated.

Various test methods were performed as follows.

NOx removal test An acrylic fiber nonwoven fabric filter having a target area of 10 cm × 10 cm was applied to the front side of the ventilation fan at a ventilation volume of 1.5 m ³ / min, and a filter coated with photocatalyst B on the suction side. And a filter coated with photocatalyst A was arranged and fixed. In addition, a cold cathode fluorescent lamp (EC3V36 / Toshiba Lighting Technology) is placed about 5 mm before the photocatalyst A filter.
300T4 irradiation intensity of 1 mw / cm ² ). Ventilation fan equipped with this filter and lamp, capacity is 45,0
It was placed in a 00 cm ³ transparent ABS container and sealed.

NO gas and NO ₂ gas are each 10 ppm
And the ventilation fan was operated while the lamp was lit. After operating for a certain period of time, the concentrations of NO and NO ₂ were measured by gas detection tubes. The difference between the measured (NO + NO ₂ ) concentration and the (NO + NO ₂ ) initial concentration was divided by the initial concentration to obtain a NOx removal rate.

Formaldehyde removal test Using the same apparatus as in the NOx removal test, formaldehyde gas was injected at 10 ppm, and the ventilation fan was operated while the lamp was turned on. After operating for a certain period of time, the concentration of formaldehyde gas was measured with a gas detector tube. The difference between the measured concentration and the initial concentration was divided by the initial concentration to obtain a removal rate.

Tobacco deodorizing test The same device as used in the NOx test was used, and a cigarette smoke generator was provided in this container. This cigarette smoke generator is
A tube is attached to the filter side of the lit cigarette, which is connected to a diaphragm pump. When the diaphragm pump is driven at a flow rate of 1,800 cm ³ / min to reduce the pressure on the tube end on the cigarette side, the smoke that has passed through the cigarette filter is exhausted from the discharge side of the pump. After burning three cigarettes continuously, the lamp was turned on and the ventilation fan was operated. Ammonia at regular intervals,
The concentrations of acetaldehyde and acetic acid were measured with each detector tube. The difference between the measured concentration and the initial concentration was divided by the initial concentration to obtain a removal rate.

Dirt Decomposition Test Using the same device as in the cigarette deodorization test, the lamp is not turned on. After three cigarettes were continuously burned and the ventilation fan was driven for 5 minutes, the container was opened, the nonwoven fabric filter was removed, and a sample with dirt attached was obtained.

Next, the stain-adhered photocatalyst filter is irradiated with light from a fluorescent lamp, and the color of the stain on the stain-adhered filter is measured over time with a color difference meter (Z1001DP manufactured by Nippon Denshoku Industries Co., Ltd.). The degradation rate was evaluated. The method for determining the decomposition rate is as follows. Degradation rate (%) = (color difference before light irradiation-color difference before light irradiation) / (color difference before light irradiation) × 100 Antibacterial test The test bacteria were cultured on an agar plate medium at 35 ° C. for 18 to 24 hours. The colonies are suspended in 1/500 concentration of normal bouillon medium (Eiken) and adjusted to about 105 to 6 CFU / ml. The test filter (5 cm x 5 c)
To m), 0.5 ml of the test bacterial suspension is uniformly contacted. A polyethylene film (4.5 × 4.5 cm) is placed on top of it, and is operated for 24 hours at a humidity of 95% and a temperature of 35 ° C. The light irradiation was performed with and without light irradiation, and the light irradiation was performed with a fluorescent lamp (1000 Lux).

After the action for a predetermined time, the SCDLP is added to the test sample.
Add 10 ml of bouillon and shake. Dilution trains were prepared using the shaken solution as a stock solution, and the number of colonies generated after culturing at 35 ° C. for 48 hours was measured using a plate mixed with standard agar medium (Eiken). The same operation was performed using a sterile petri dish to serve as a sample control.

Antibacterial rate = (number of untreated test bacterial cells-number of photocatalytic treated test bacterial cells) / number of untreated test bacterial cells When the antibacterial rate is 99% or more,
It can be determined that there is antibacterial activity.

In the test, the photocatalyst A was a filter formed by combining a filter formed with TiO ₂ : binder amount of 90:10 and the photocatalyst B was formed by combining a filter formed by changing the ratio of TiO ₂ : ZnO with constant binder amount. Was carried out by Table 1 shows the NOx test results, and Table 2 shows the formaldehyde removal test and tobacco deodorization test results. Table 3 shows the results of the antibacterial test and the decomposition test of the tobacco soil. In addition, the antibacterial test performed photocatalyst B alone. The tobacco dirt test is performed by setting two photocatalysts A and B and attaching the dirt to the photocatalyst, and taking out the dirt.
No. 3, No. 5 to No. 7 were carried out alone.

Results of NOx removal test Regarding NO, the removal amount decreases slightly as the amount of ZnO added to the photocatalyst B increases, but no significant difference is observed in any of the samples, indicating that the photocatalyst A contributes to NO removal. .

On the other hand, with respect to NO ₂ ,
No. 1 and No. 7, which contain only O ₂ and ZnO, and No. 6 with a large addition amount of ZnO, the removal amount is small, and ZnO is added to TiO ₂ by 5%.
It was found that when 0% or less was added, the amount of NO ₂ removed increased. Also, it was found that the best effect was obtained when ZnO was added at about 15%.

The total NOx removal rate is ZnO
No. 2 to No. 5 containing 10% to 50% of
As a result, a high value of 70% or more was obtained.

Results of Formaldehyde Removal Test and Tobacco Deodorization Test A similar tendency was observed in the formaldehyde removal test and tobacco deodorization test. As the amount of ZnO added to the photocatalyst B increases, the removal rate tends to gradually decrease,
The removal rate of No. 2 to No. 5 in which the amount of ZnO added was 10% to 50% was slightly lower than that of No. 1, and the reduction rate decreased in Nos. 6 and 7 in which the ZnO addition amount was further increased. Also, ammonia has almost the same removal rate in all samples.
This shows that ammonia is almost deodorized by the photocatalyst A. Aldehydes, acetic acid is roughly removed and deodorized photocatalytic A, odor which can not be taken reaches up photocatalyst B, it was found that TiO ₂ photocatalyst B is performing the removal and deodorization contributes mainly.

Antibacterial test results No. 1 containing 100% TiO _{2 and} no ZnO had a sterilization rate of 99.99 for both Escherichia coli and Staphylococcus aureus when irradiated with light.
% Or more, but around 50% without light. TiO ₂ is a photocatalyst, and when irradiated with light, the effect is remarkable, but when there is no light, the effect is small.

On the other hand, Zn.
In the case of o.7, the sterilization rate was 99.99% or more for both light irradiation and non-light irradiation. It has been found that ZnO acts as an antibacterial agent and is effective even without light irradiation.

Tobacco dirt decomposition test The initial dirt before decomposition was about ΔE = 10 in No. 1 (photocatalyst A) containing 100% TiO _{2 and} no ZnO. Nos. 3, Nos. 5 to 7 (photocatalyst B) were slightly stained since the stains passed through the photocatalyst A were attached, and the initial stain was about ΔE = 6. The more the initial dirt, the more difficult it is to disassemble.
A decomposition rate equal to or higher than that of No. 3, No. 5 to No. 7 to which ZnO was added was obtained, and it can be seen that TiO ₂ was more excellent in decomposing performance of tobacco. In addition, when ZnO increases, the decomposition rate decreases. In visual evaluation, addition of 50% ZnO was the limit with a UV lamp.

[0044]

[Table 1]

[0045]

[Table 2]

[0046]

[Table 3]

In this embodiment, the amount of the resin added is
O ₂ or (TiO ₂ + ZnO): resin = 90: 10
However, the amount of resin can be increased. When the content of the resin is increased, the adhesion to the base material is improved, but the performance is deteriorated. As a result of changing the resin addition amount of the photocatalyst A in Table 2 and evaluating in a cigarette soil decomposition test, it is effective in sunlight when the resin addition amount is 50% or less, and is effective when the UV lamp is used at 30% or less. I understood that.

It is also possible to use an inorganic material such as silica as a binder. When the base material contains acryl, the adhesion is slightly reduced with a silica binder. However, if the base material is not washed with water, it does not peel off by impact or airflow, and there is no practical problem as a filter. When such a silica binder is used, the life of the photocatalyst film is prolonged without the binder itself being deteriorated by the photocatalyst.

The coating liquid containing TiO ₂ and ZnO is not limited to water, and other organic solvents may be used. In any case where ethanol or propanol is used or a mixture thereof is used, a coating liquid can be prepared.

Example 2 In Example 1, photocatalysts A and B
Was separately applied to two filters as shown in FIG. 1- (1), but may be formed on one filter as shown in FIGS. 1- (2) to (4). Fig. 1- (2)
In this example, an acrylic nonwoven fabric filter 101 is provided with a film 102 on which a No. 3-photocatalyst A is formed by being laminated on a film 103 on which a No. 3-photocatalyst B is formed in Example 1. In FIG. 1- (3), Nos. 3-A and B in Example 1 were applied to each side by spraying. Figure 1
In (4), Nos. 3-A and 3-B are applied half-face by half, and folded in a bellows to increase the surface area. In each case, the film 102 having the photocatalyst A formed upstream of the air flow and the film 103 having the photocatalyst B formed downstream thereof are disposed.
When an Ox removal test and a formaldehyde removal test were performed, the same performance as in Example 1 was obtained.

The substrate on which the air purifying film is formed is not limited to an acrylic nonwoven fabric, and may be made of an organic polymer such as polyester, polypropylene, urethane, ceramic, glass, paper, or the like. In addition, any structure may be used as long as the gas can pass through, such as a fibrous, foamed, or porous material.

It is also preferable to color the base material from the viewpoint of appearance design. As shown in FIG. 1- (1), when the photocatalysts A and B are separated from each other as shown in FIG. 1- (1), the photocatalysts A and B can be formed by applying the photocatalysts to the substrates colored in different colors. There is also an advantage that it can be easily distinguished.

Further, in the case of a white or colorless and transparent filter, light is reflected or transmitted, and light energy cannot be used effectively. However, coloring with a coloring agent having a light absorption peak in a wavelength range of 400 to 700 nm is performed. If performed, light energy can be more effectively utilized. In the case of coloring, if an organic pigment or dye is used, it is decomposed by a photocatalyst and the color disappears. Therefore, it is necessary to use an inorganic pigment.

In the embodiment shown in FIG. 1- (1),
Acrylic non-woven fabric filter on the upstream side for airflow,
After 422 U of an inorganic gray pigment was dispersed in 1 wt% of an acrylic nonwoven fabric and kneaded and colored, photocatalyst A of sample No. 3 in Example 1 was formed. In addition, in an acrylic nonwoven fabric filter on the downstream side, Pantone 2985U of an inorganic blue pigment was dispersed at 1 wt% of the acrylic nonwoven fabric and kneaded and colored. Then, photocatalyst B of Sample No. 3 was formed.

The performance of the colored air purification membrane filter of this example was examined by performing the NOx test and the formaldehyde test in Example 1, and the colored air purification membrane filter of Example 1 was uncolored.
Compared to 3. Table 4 shows the results. As a result, it was found that the decomposition rate was better when the pigment was added.

Therefore, a colored filter can decompose harmful substances, organic stains, odors and microorganisms in a shorter time than a colorless filter. Also, because pigments are inorganic,
The nutrient sources of the microorganisms are not further increased, and the effect of decomposing the microorganisms is not different from that shown in Example 1, and the propagation of the microorganisms can be suppressed regardless of the light place or the dark place.

[0057]

[Table 4]

(Embodiment 3) FIG. 2 is an external perspective view of an air purifier according to an embodiment of the present invention. In FIG.
Denotes a main body frame, 202 denotes a rear case of the main body frame 201, and 203 denotes a main body panel.

The main body frame 201 includes a light receiving sensor 207 for turning on / off a motor 211 described later by an infrared signal emitted from an infrared light emitting section 205 provided on a remote control switch 204, and a select switch for selecting continuous operation, timer operation, and the like. 208, a membrane switch 209 required for operation on / off operation by a finger touch method, and an operation panel 206 provided with various display lamps and the like are attached.

FIG. 3 is an exploded view of a filtration type air cleaner. In the figure, reference numeral 210 denotes an air suction port of the main body frame 201, and a motor 211 is attached to the back of the main body frame 201. Note that the motor 211
In the off operation, the remote control switch 204 may be used in combination with the membrane switch 209 or other switches using a finger touch method instead of the remote control switch 204.

The rear case 202 includes the sirocco fan 21
2 is mounted together with the fan mounting bracket 214,
The sirocco fan 212 is rotationally driven by a motor 211 to create an air flow. With this airflow, dirty air in the room, including dust, smoke, oil particles, microorganisms, pollen, foul odor, etc., is sucked from the panel 203. The sucked air is filtered by the filter 215 to become clean air, and is repeatedly discharged into the room by the sirocco fan 212 from the air discharge port 213 of the rear case 202. The generated air volume is approximately 0.5 to 4 (m ³ /
Minutes) can be adjusted in four stages.

The filter 215 is a filter set between the main body frame 201 and the panel 203, and has a composite structure for providing a function for removing various stains and odors. Filter 215 and body frame 2
The light source 216 (cold-cathode fluorescent lamp EC3V36 / 300T4 manufactured by Toshiba Lighting & Technology Corp., irradiation intensity 1 mw / cm ² ) is mounted between the light emitting devices.

FIG. 4 shows the structure of the filter 215. The filter 215 includes, in order from the side of the main body panel 203, a dust collection filter 401 made of electret-treated polypropylene nonwoven fabric, a polypropylene nonwoven fabric filter 402 mixed with activated carbon, and a dust collection filter 40.
1, a photocatalyst A filter 404 having a photocatalyst A and a photocatalyst B filter having a photocatalyst B formed of a polyester nonwoven fabric filter cover 403 integrally formed with an activated carbon filter 402 and further having an acrylic nonwoven fabric and having a photocatalyst A of No. 405. The photocatalyst A filter 404 is colored with a gray inorganic pigment, and the photocatalyst B filter 405 is colored with a blue inorganic pigment. Light from light source 216 is photocatalyst B
Irradiate the filter 405 and further reach the photocatalyst A filter 404.

Dust, smoke, oil fine particles, microorganisms and dead bodies of microorganisms, pollens, harmful substances such as NOx and formaldehyde, and odorous components such as ammonia and acetaldehyde contained in the dirty air taken in from the air suction port of the panel 203. The components are first collected by a filter cover 403, a dust filter 401, and an activated carbon filter 402.
The particulate dirt components, microorganisms, harmful substances, and odor components that have passed through the filters 401, 402, 403 are collected by the photocatalyst filters 404, 405, and the clean air is discharged.

The filters 401, 402, and 403 have a structure that can be removed since dirt and odor components once adhered cannot be removed, and are replaced in a fixed period. In the initial performance, 99% or more of 0.005 μm particles are trapped, and the odorous components can be almost deodorized.
05 further improves the performance. Further, an antibacterial material, an antifungal material, an antiviral material, a deodorizing material, or the like may be added to the filter cover. In addition, the dust collection system combined with the photocatalytic filter is not limited to the filter, but may be an electric dust collector or the like.

In the photocatalyst filters 404 and 405, inorganic dirt which is difficult to decompose by the photocatalyst is removed by the filters 401, 402 and 403 at the preceding stage, and the dirt is not rapidly attached. The dirt is sufficiently decomposed and does not need to be replaced.

The performance of the filters 401, 402, and 403 gradually deteriorates. In such a case, the photocatalyst filters 404 and 405 can perform deodorization, dirt decomposition, and antimicrobial treatment, so that the performance of the entire apparatus is hardly reduced. Furthermore, Ti
NOx can be removed by the synergistic action of O ₂ , TiO ₂ + ZnO.

Further, the light source is a photocatalytic filter 404,4.
By arranging after 05, it is possible to prevent the light source from becoming dirty and reducing the light irradiation intensity. The light source was set to the photocatalyst filters 404 and
5, light energy can be efficiently used by irradiating the two photocatalyst filters uniformly with light.

Even if no light source is mounted, the main body panel 203
A transparent plastic part (for example, manufactured by Techno Polymer:
As a Taflex 450 EB-PT), light from the outside is transmitted so that the photocatalytic filters 404 and 405 can be used.
It is also possible to irradiate the light.

Further, the photocatalyst filters 404, 405
If it is configured to be detachable, even if the dust collecting filter 401 and the like are not disposed at the preceding stage, if the dirt suddenly adheres, the dirt can be removed and decomposed with sunlight. Further, since the photocatalyst formed in the filter of this example uses an acrylic resin, the filter has excellent adhesion to a filter using the same acrylic resin, and can be washed with water. In the case of washing with water, it is possible to remove inorganic substances and large-sized dust that are difficult to decompose with a photocatalyst. Furthermore, the presence of moisture increases the amount of OH radicals required for the photolysis reaction, and further promotes the decomposition of organic substances.

What has been described in this embodiment can be applied to articles provided with members for purifying air by generating an air flow, air conditioners and vacuum cleaners, ion-type air cleaners, ventilation fans, cooling and heating equipment, and the like. .

[0072]

Effects of the Invention photocatalyst and TiO ₂ containing TiO _2, Zn
An air purification film composed of two types of photocatalysts, including O-containing photocatalysts, is formed, and harmful substances are removed, deodorized,
An article having excellent antibacterial and antifouling effects can be provided.

[Brief description of the drawings]

FIG. 1 is a diagram showing a form of an air purification film.

FIG. 2 is an external perspective view of an air purifier.

FIG. 3 is an exploded view of an air purifier.

FIG. 4 is an exploded view of an air purifier filter.

[Explanation of symbols]

101 ... acrylic nonwoven, 102 ... sample No.3- photocatalyst A (photocatalyst comprising TiO _2), 103 ... sample N
o.3- photocatalyst B (photocatalyst comprising TiO _2, ZnO), ₂
01: body frame, 202: rear case of body frame, 203: body panel, 204: remote control switch,
205 ... infrared light emitting unit, 206 ... operation panel, 207 ...
Light receiving sensor, 208: Select switch, 209: Membrane switch, 210: Air inlet, 211: Motor, 212: Sirocco fan, 214: Fan mounting bracket, 215: Filter, 216: Cold cathode fluorescent lamp,
213: air discharge port, 401: dust collection filter, 402
… Polypropylene non-woven fabric filter blended with activated carbon,
403: polyester nonwoven fabric filter cover, 40
4 ... Photocatalyst A filter, 405 ... Photocatalyst B filter.

Continued on the front page (72) Inventor Takuo Kawaguchi 1-1-1, Higashitaga-cho, Hitachi City, Ibaraki Prefecture Inside the Taga Headquarters, Electric Appliances Division, Hitachi, Ltd. No. 1-1 Inside the Taga Headquarters, Hitachi, Ltd.Electrical Equipment Division (72) Inventor Katsunori Terayama 1-1-1, Higashitaga-cho, Hitachi City, Ibaraki Prefecture F-term within Tachitagaga Technology Co., Ltd. 4C080 AA05 AA07 AA10 BB02 BB05 CC02 CC08 HH05 JJ03 JJ05 JJ06 JJ09 KK08 LL03 MM02 NN22 NN26 QQ11 QQ17 QQ20 4D012 CA09 CA10 CB03 CB09 CD10 CE03 CF10 CG10 CH05 CK06 CK10 4D058 JA12 JA01 SA13 TA07 SA01

Claims (20)

[Claims] 1. An air purification membrane which is brought into contact with indoor or outdoor air by an air flow generated by driving an ionizer or an electric blower, a T upstream of the air flow.
It has a photocatalytic film containing iO _2, TiO ₂ and Z downstream
An air purifying film having a photocatalytic film containing nO. 2. The composition according to claim 1, wherein the composition ratio of TiO ₂ : ZnO in the photocatalytic film containing TiO ₂ and ZnO on the downstream side is 90:10 to 50: 5.
An air purification membrane, which is 0. 3. The air purification film according to claim 1, wherein the photocatalyst film on the downstream side includes TiO ₂ , ZnO, and an organic resin. 4. The air purification film according to claim 1, wherein the upstream photocatalytic film contains TiO ₂ and an organic resin. 5. An article comprising the air purifying film according to claim 1 provided on a surface of a substrate which is exposed to indoor illumination light or sunlight from outside. 6. An article, comprising: the air purification film according to claim 1 on a surface of a substrate; and a light source mounted on the air purification film so as to irradiate the air purification film with light. . 7. The method according to claim 6, wherein the light source is an ultraviolet lamp, a fluorescent lamp, an LED lamp,
An article characterized by being one of incandescent lamps. 8. The article according to claim 5, wherein the filtering member is formed of a plurality of layers, and the air purification film is formed on at least one layer. 9. The device according to claim 8, further comprising: a member having the air purification film, and one or more of a member having a dust collection function and a member having an adsorption function. Goods to do. 10. An article according to claim 9, wherein said member having a dust collecting function is a member which has been subjected to electret treatment. 11. The filter according to claim 5, wherein an inorganic coloring pigment is dispersed and compounded in the material of the filtering member provided with the air purification film, and the inorganic coloring pigment has a wavelength of 400 nm to 700 nm. An article having a maximum absorption peak in the region of (1). 12. An airflow generated by driving an electric blower takes in room air through an air intake port, passes through a filtering member provided in a ventilation path, and causes dust, oil particles, or the like floating in the air. An air purifier that collects and purifies smoke, pollen, various microorganisms, or malodorous substances and harmful gases, and then discharges the exhaust gas through an exhaust port. An air purifier comprising an air purification film according to any one of claims 1 to 4 formed on a surface of a filtration member that comes into contact with light. 13. An air flow generated by driving an electric blower, air from inside the room is taken in by an air inlet, and is passed through a filtering member provided in a ventilation path, so that dust and oil particles floating in the air are removed. An air purifier that collects and purifies smoke, pollen, various microorganisms, or malodorous substances and harmful gases, and then discharges the exhaust air through an exhaust port. In, on the surface of the filtering member touching the light from the light source,
An air purifier comprising the air purification film according to claim 1. 14. The air purifier according to claim 13, wherein the light source is any one of an ultraviolet lamp, a fluorescent lamp, an LED lamp, and an incandescent lamp. 15. The air purifier according to claim 12, wherein the filtering member is formed of a plurality of layers, and the air purification film is formed on at least one layer. Machine. 16. The apparatus according to claim 15, further comprising: a member having the air purification film, a member having a dust collecting function, or a member having an adsorption function. Air purifier. 17. The air purifier according to claim 16, wherein the member having the dust collecting function is a member subjected to electret treatment. 18. The air purifier according to claim 16, wherein a member having a dust collecting function, a member having an air purification film, and a light source are arranged in this order from the intake port to the exhaust port. Machine. 19. An inorganic coloring pigment according to claim 12, wherein an inorganic coloring pigment is dispersed and compounded in a material of the filtering member provided with the air purification film, and the inorganic coloring pigment has a wavelength of 400 nm to 700 nm. An air purifier having a maximum absorption peak in the region of (1). 20. The air purifier according to claim 12, wherein the filtering member on which the air purification film is formed is detachable from an air purifier main body.