WO2018020932A1

WO2018020932A1 - Filter medium and air purification apparatus using same

Info

Publication number: WO2018020932A1
Application number: PCT/JP2017/023468
Authority: WO
Inventors: 稲垣　純; 由浩辻; 大輔小森; 港加藤
Original assignee: パナソニックＩｐマネジメント株式会社
Priority date: 2016-07-28
Filing date: 2017-06-27
Publication date: 2018-02-01
Also published as: JP2018015710A; CN109475799B; CN109475799A; JP6738998B2

Abstract

A filter medium (15) according to the present invention is characterized by being provided with a front stage layer and a rear stage layer on the downstream side of an airflow with respect to the front stage layer, the front stage layer being a fiber layer comprising a radical capturing agent and capable of capturing particles, the rear stage layer being a fiber layer comprising an adsorbing agent containing an amine compound, and the front stage layer and the rear stage layer being brought into close contact with each other to form a sheet.

Description

Filter media and air purifier using the same

The present invention relates to a filter medium and an air cleaning device using the filter medium.

Conventionally, a filter medium having a deodorizing and removing action such as formaldehyde and an air purifier using the filter medium have the following configurations.

FIG. 8 is a perspective view showing a conventional air cleaning device. That is, as shown in FIG. 8, the filter medium 150 includes a base material and an amine compound for removing formaldehyde supported on the base material. The air filter 101 is obtained by processing the filter medium 150 into a bellows shape so as to have a filter shape and fixing the filter medium 150 with a frame body 102. The air purifying apparatus 100 is provided with the air filter 101 installed in an air flow path in a main body 105 provided with a blower 103 that allows air to pass through and an air supply grill 104.

Formaldehyde is released from the wallpaper and furniture in the house and causes health problems even at low concentrations. Therefore, it is desired to remove it as an indoor pollutant. For example, it has been shown that the contact efficiency between the air filter 101 and air can be improved without increasing the pressure loss of the air filter 101 by imparting a formaldehyde removal function to the substrate (for example, see Patent Document 1). reference).

Also, the resin fiber that is the raw material of the base material may cause discoloration when used for a long time. As a method for preventing discoloration of the resin fiber, that is, improving the weather resistance, a method using a light stabilizer and an ultraviolet absorber is known. In other words, by adding an appropriate amount of a hindered amine light stabilizer and an ultraviolet absorber to polypropylene fibers, which are resin fibers, melt-mixing them into a resin composition made into a fiber by a known melt spinning method, weather resistance The nonwoven fabric which improved can be obtained. This nonwoven fabric can be used as a filter medium for an air cleaning device (see, for example, Patent Document 2).

Japanese Patent Laid-Open No. 11-128632 JP 2006-169273 A

Such a conventional filter medium and an air purifier using the filter medium can remove formaldehyde with a low pressure loss, but it is desired to further maintain the removal performance. That is, an amine compound is required to remove formaldehyde, but the amine compound is a basic substance and causes a neutralization reaction when it comes into contact with an acidic substance contained in particles in the air. Therefore, the amine compound in a filter medium decreased, and the subject that the removal performance of formaldehyde of an air cleaner fell occurred. In the air, active components such as ozone, OH radicals, and NO radicals generated by ultraviolet rays are contained. For this reason, in the air cleaning apparatus that performs processing by sucking in a large amount of air, there is a problem that these active components react with the amine compound and formaldehyde removal performance is likely to deteriorate.

Moreover, the conventional weather resistance improving method only shows a method for preventing discoloration of the nonwoven fabric itself, and does not mention an effective method for removing formaldehyde. For example, it was not possible to obtain information on how to dispose polypropylene fibers, light stabilizers, ultraviolet absorbers, and amine compounds.

Accordingly, the present invention solves the above-described conventional problems, and provides a filter medium that can effectively remove chemical substances such as formaldehyde and can stably maintain the effect over a long period of time, and an air cleaning device using the filter medium. It is an object.

And in order to achieve this object, the present invention is a filter medium comprising a downstream layer on the downstream side of the air flow with respect to the upstream layer and the upstream layer, the upstream layer containing a radical scavenger, and A fiber layer capable of collecting particles, and the latter layer is a fiber layer containing an adsorbent containing an amine compound, and has a sheet shape in which the former layer and the latter layer are in close contact with each other. . This achieves the intended purpose.

According to the present invention, it is possible to provide a filter medium capable of effectively removing chemical substances such as formaldehyde and maintaining the effect stably over a long period of time, and an air cleaning device using the filter medium.

FIG. 1 is a perspective view showing an installation state of the air cleaning device according to the first embodiment of the present invention. FIG. 2 is a cross-sectional view of the air cleaning device. FIG. 3 is a perspective view of the air filter. FIG. 4 is a configuration diagram of a filter medium used for the air filter. FIG. 5 is a schematic sectional view of the filter medium. FIG. 6 is an enlarged view of FIG. FIG. 7 is a perspective view showing an air filter according to the second embodiment of the present invention. FIG. 8 is a perspective view showing a conventional air cleaning device.

The filter medium according to claim 1 of the present invention is a filter medium having a downstream layer on the downstream side of the air flow with respect to the upstream layer and the upstream layer, the upstream layer including a radical scavenger and capturing particles. It is a fiber layer that can be collected, and the latter layer is a fiber layer containing an adsorbent containing an amine compound, and is formed into a sheet shape in which the former layer and the latter layer are in close contact with each other.

This makes it difficult for amine compounds contained in the latter layer to react with active components such as oxidizing substances in the air, ozone, OH radicals, and NO radicals. Therefore, the effect that the performance which removes formaldehyde etc. stably over a long period of time can be maintained can be obtained.

In the filter medium according to claim 2, the amine compound is applied to the surface of the fibers constituting the latter layer.

Thereby, the applied amine compound is exposed over a wide range on the surface of the filter medium constituting the latter layer. Therefore, the contact area with formaldehyde is improved, and the effect of removing chemical substances such as formaldehyde can be further improved.

Further, in the filter medium according to claim 3, the radical scavenger contains one or more of hindered amines, hindered phenols, and benzotriazoles.

Thus, active components such as ozone and radicals can be removed in the former layer, and air from which radicals have been removed is sprayed on the latter layer. Therefore, the effect which suppresses the performance deterioration of an amine compound by reducing the radicals contained in the air can be acquired. Moreover, the effect which prevents discoloration of a fiber layer can be acquired.

Further, in the filter medium according to claim 4, the content of the amine compound in the latter layer is high on the side of the close contact surface with the front layer, and lower as it goes away from the close contact surface.

As a result, only a small amount of the amine compound exists on the surface exposed to the air away from the contact surface, and the amine compound reacts with the radicals and decreases during storage of the filter medium. The ratio can be reduced. Therefore, compared with the case where it apply | coats uniformly, the ratio which an amine compound remains can be kept predetermined, and initial stage performance can be maintained over a long period of time.

The air purifying apparatus according to claim 5 includes a main body case having an intake port and an exhaust port, a blower provided in the main body case, and an air filter provided between the suction side of the blower and the intake port. An air filter is an air cleaning device comprising the filter medium according to claim 1.

Thus, it is possible to provide an air cleaning device that can effectively remove chemical substances such as formaldehyde in the room and can stably maintain the effect over a long period of time.

Further, in the air purifying apparatus according to claim 6, the air filter is different from the pre-stage layer disposed downstream of the base material layer in addition to the pre-filter as the pre-stage layer and the base material layer as the post-stage layer. A fiber layer including a radical scavenger and a frame portion. The prefilter, the base material layer, and the fiber layer that is different from the previous layer are bonded so as to be integrated with each other through the frame portion, and are arranged on the air inlet side of the main body case. is there.

As a result, as viewed from the base material layer, there is a radical scavenger contained in the upstream layer on the upstream side, and a radical scavenger contained in a fiber layer different from the upstream layer on the downstream side. It is possible to obtain an air purifier that is less likely to deteriorate in performance even when the operation of the apparatus is stopped and that can stably maintain the collection performance over a long period of time.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
FIG. 1 is a perspective view showing an installation state of the air purifying apparatus according to Embodiment 1. FIG. As shown in FIG. 1, the air purification apparatus 1 shown in this Embodiment is installed on the floor 3 of the room 2, and can perform an air purification operation. Formaldehyde is generated from wallpaper 4 or furniture 5. Since the generated formaldehyde has a higher specific gravity than air, it is present near the floor 3 in a high concentration state. Outdoor air contains acidic substance particles and active components such as ozone, OH radicals, and NO radicals generated by the action of ultraviolet rays. For this reason, when a person moves indoors or outdoors, or when air flows from the outside by opening / closing the window 6, acidic substance particles or active components such as ozone, OH radicals, and NO radicals enter the room.

FIG. 2 is a cross-sectional view of the air cleaning device according to the first embodiment. As shown in FIG. 2, the air cleaning device 1 according to the present embodiment includes a blower 8 and an air filter 9 in a main body case 7. The main body case 7 has a substantially vertically long box shape, and is provided with an intake port 10 and an exhaust port 11. The air inlet 10 has a substantially rectangular shape, and is provided on the front side surface portion of the main body case 7. Further, the exhaust port 11 is provided in the top surface portion of the main body case 7.

The air blower 8 is provided in the air path between the air inlet 10 and the air outlet 11 of the main body case 7. The air blower 8 is formed of a scroll-shaped casing 12, a blade 13 that is a centrifugal fan provided in the casing 12, and an electric motor 14 that rotates the blade 13.

The air filter 9 is located near the air inlet 10 of the main body case 7. Indoor air containing formaldehyde sucked into the main body case 7 from the air inlet 10 by the air blowing unit 8 is blown to the air outlet 11 through the air filter 9. That is, the air containing formaldehyde in the room is cleaned by the air filter 9 and blown into the room by the blower unit 8. The air filter 9 may collect not only formaldehyde but also particles such as coarse dust. Details will be described later.

FIG. 3 is a perspective view of the air filter according to the first embodiment. FIG. 4 is a configuration diagram of a filter medium used for the air filter according to the first embodiment. As shown in FIGS. 3 and 4, the air filter 9 includes a pleated filter medium 15 and a frame-shaped shape holding portion 16 provided on the outer periphery of the filter medium 15 to hold the filter medium 15 in a pleated shape. Formed from. The shape holding portion 16 is formed from a square-shaped frame portion 17 and an adhesive member 18 provided between the frame portion 17 and the filter medium 15. That is, the frame part 17 is located at the periphery of the pleated filter medium 15, and the filter medium 15 is fixed to the frame part 17 by the adhesive member 18.

FIG. 5 is a schematic cross-sectional view of the filter medium according to the first embodiment. FIG. 6 is an enlarged view of FIG. The filter medium 15 before pleating is provided with a base material layer 19 and a fiber layer 20 as shown in FIGS. The fiber layer 20 is provided on the upstream surface of the air flow blown to the base material layer 19. That is, the filter medium is installed in the air cleaning device 1 so that the fiber layer 20 is on the upstream side with respect to the air flow.

The base material layer 19 is formed of fibers containing at least one of glass fibers, pulp fibers, resin fibers, carbon fibers, and inorganic fibers. Examples of the method for producing the base material layer 19 include a spunbond method, a dry or wet papermaking method, a melt blown method, a spunbond method, an airlaid method, and a thermal bond method. In particular, the wet papermaking method is preferable. According to this manufacturing method, as shown in FIG. 6, the base material layer 19 can have a density gradient so as to gradually decrease from dense to sparse when viewed from the fiber layer 20 side. That is, the density of the fibers constituting the base material layer 19 is closest to the bonding surface with the fiber layer 20 and becomes sparse as the distance from the bonding surface increases. In the example of FIG. 6, the number of fibers in the base material layer 19 in a dense portion where the base material layer 19 and the fiber layer 20 are in close contact is nine. In addition, the number of fibers of the base material layer 19 in a sparse part away from the fiber layer 20 is five. In the base material layer 19 having such a configuration, when the adsorbent containing an amine compound is applied to the fiber, the adsorbent content on the surface where the base material layer 19 and the fiber layer 20 are in close contact with each other can be easily obtained. It can be increased relatively. That is, it is possible to make a configuration in which the content of the amine-based compound in the base material layer 19 is high on the side of the close contact surface with the fiber layer 20 and decreases as the distance from the close contact surface increases.

Here, the basis weight of the base material layer 19 is preferably 10 to 100 g / m ² . When the basis weight is less than 10 g / m ² , the bending resistance of the base material layer 19 decreases, so that it becomes difficult to reduce the productivity of the pleating process and to maintain the filter shape. On the other hand, when the weight per unit area exceeds 100 g / m ² , the pressure loss of the base material layer 19 increases, and thus the pressure loss of the air filter 9 increases, which is not preferable.

The average fiber diameter of the fibers constituting the base material layer 19 is preferably 1 to 50 μm. When the average fiber diameter is less than 1 μm, the strength of the fiber is low and the strength as a reinforcing material becomes insufficient. On the other hand, if the average fiber diameter exceeds 50 μm, the thickness of the base material layer 19 is increased, and the structural pressure loss due to pleating increases, which is not preferable.

The fiber layer 20 may be made of the same material as the base material layer 19. The fiber layer 20 and the base material layer 19 can be integrated using an adhesive. For example, when a heat-meltable fiber is used for the fiber layer 20, the fiber layer 20 is melted by heating and bonded to the base material layer 19, so that the filter medium 15 can be integrated.

Here, the average fiber diameter of the fibers constituting the fiber layer 20 is preferably 1 to 10 μm. When the average fiber diameter is less than 1 μm, the basis weight is required to be increased because the self-supporting property is poor. As a result, the pressure loss of the fiber layer 20 increases, which is not preferable. On the other hand, if the average fiber diameter exceeds 10 μm, the collection efficiency of the fiber layer 20 decreases, which is not preferable. In particular, a preferable average fiber diameter is 2 to 6 μm.

The fiber diameter of the fiber layer 20 is preferably thinner than that of the base material layer 19. Thereby, it is possible to obtain a balanced filter medium 15 having high dust collection efficiency and low pressure loss. The filter medium 15 thus prepared has a pressure loss greater in the fiber layer 20 and smaller in the base material layer 19. For example, the pressure loss when air is flowed at a flow rate of 5.3 cm / s is about 40 Pa for the fiber layer 20 and about 3 Pa for the base material layer 19.

For the base material layer 19 and the fiber layer 20, general resin materials and natural fiber materials can be used. For example, polyacrylonitrile (PAN), polypropylene (PP), polyethylene (PE), polyethylene oxide (PEO), polyethylene naphthalate (PEN), polyethylene terephthalate (PET), polyethersulfone (PES), polymethacrylic acid, polymethacrylic Methyl acid, polyvinylidene fluoride (PVDF), polyvinyl chloride (PVC), polytetrafluoroethylene, polyvinyl alcohol (PVA), polycarbonate (PC), polystyrene, polyamide, polyimide, polyamideimide, aramid, polyimide benzazole, polyglycol Examples include acid (PGA), polylactic acid (PLA), polyurethane (PU), cellulose compound, polypeptide, nylon and the like.

The adsorbent containing the amine compound of the present invention contains an amine compound in at least a part of the components. It is known that an amine compound and formaldehyde cause the following irreversible chemical reaction. For example,
R-ΝH ₂ + HCHO
→ RN = CH ₂ + H ₂ O (shiff base)
2H ₂ NCONH ₂ (urea) + HCHO
→ NN ₂ CONHCH ₂ NHCONH ₂ (dimethylol urea)
NH ₂ —NH ₂ (hydrazine) + 2HCΗO
→ CΗ ₂ = N−N = CΗ ₂
It reacts like this. These reactions also occur with gas components having aldehyde groups. Therefore, the amine compound has reactivity with aldehyde compounds such as acetaldehyde and propionaldehyde in addition to formaldehyde. In general, aldehydes are substances having an unpleasant odor, and the filter medium of the present invention can also be applied to deodorization intended for aldehydes.

The above reaction is called chemical adsorption because it involves a chemical reaction, and is distinguished from physical adsorption such as activated carbon. In the case of chemical adsorption, since the adsorbed aldehydes are not re-released, there is an advantage that aldehydes can be removed stably. On the other hand, the amine compound is a basic substance, and when it comes into contact with an acidic substance in the air, there is a problem that a neutralization reaction occurs and the performance of removing aldehydes decreases. The acidic substance here is mist such as nitric acid, sulfuric acid, acetic acid, or suspended particles containing these components. In the air, active components such as ozone, OH radicals, and NO radicals generated by ultraviolet rays are contained. In the conventional air cleaning apparatus, there is a problem that these active components react with the amine compound and the performance is easily deteriorated. Therefore, in the present invention, first, active components such as acidic substances and OH radicals are removed from the air sucked into the main body of the air cleaning device 1 with the fiber layer 20 containing a radical scavenger. Thereafter, the aldehydes such as formaldehyde are removed with an adsorbent containing an amine compound contained in the base material layer 19. According to this configuration, it is possible to provide the filter medium 15 that stably maintains the collection performance for a long period of time and the air cleaning device 1 using the filter medium.

In the present embodiment, in order to remove active substances such as acidic substances and radicals in the fiber layer 20, the fiber layer 20 containing a light stabilizer and an antioxidant, which are radical scavengers, is used. As the radical scavenger contained in the fiber layer 20 of the present invention, a general light stabilizer and antioxidant can be used. In particular, hindered amine light stabilizers, hindered phenol antioxidants, benzotriazole light stabilizers, and the like can be used.

Examples of light stabilizers and antioxidants that can be used as the radical scavenger of the present invention will be given. As a commercially available product, for example, TINUVIN 111 (manufactured by BASF Japan; N, N ′, N ″, N ′ ″-tetrakis- (4,6-bis- (butyl- (N-methyl-2,2,6 , 6-Tetramethylpiperidin-4-yl) amino) -triazin-2-yl) -4,7-diazadecane-1,10-diamine (45%), dimethyl succinate and 4-hydroxy-2,2,6 , 6-tetramethyl-1-piperidineethanol polymer (55%)), Uvinul 5050H (manufactured by BASF Japan; sterically hindered amine oligomer), CHIMASSORB 2020 (manufactured by BASF Japan); dibutylamine-1,3 , 5-Triazine-N, N'-bis (2,2,6,6-tetra Methyl-4-piperidyl-1,6-hexamethylenediamine and N- (2,2,6,6-tetramethyl-4-piperidyl) butylamine polycondensate), CHIMASSORB 944 (manufactured by BASF Japan; poly [{6 -(1,1,3,3-tetramethylbutyl) amino-1,3,5-triazine-2,4-diyl} {(2,2,6,6-tetramethyl-4-piperidyl) imino] hexa Methylene {(2,2,6,6-tetramethyl-4-piperidyl) imino}], CYASORB UV-3346 (manufactured by Cytec Corporation; poly [(6-morpholino-s-triazine-2,4-diyl) [2 , 2,6,6-tetramethyl-4-piperidyl] imino] -hexamethylene [(2,2,6,6-tetramethyl-4-piperidyl) imino]), CYAS RB UV-3529 (Cytech; 1,6-hexanediamine-N, N'-bis (1,2,2,6,6-pentamethyl-4-piperidyl) and morpholine-2,4,6-trichloro -1,3,5-triazine methylated polymer), Hastabin N30 (manufactured by Glariant); 2,2,4,4-tetramethyl-7-oxa-3,20-diaza-20 (2,3-epoxy -Propyl) dispiro- [5,1,11,2] -heneicosan-21-one polymer), vin770 (manufactured by BASF Japan), Uvinul 4050 (manufactured by BASF Japan), TINUVIN234 (manufactured by BSAF Japan; 2 -(2H- benzotriazol-2-yl) -4-6-bis (1-methyl-1-phenylethyl) phenol), Uvinu 3030 (manufactured by BASF Japan; 1,3-bis-{[(2′-cyano-3 ′, 3-diphenylacryloyl) oxy] -2,2-bis-[(2-cyano- 3 ′, 3-diphenyl) Acryloyl) oxy] methyl} propane), TINUVIN 326 (manufactured by BASF Japan; 2- [5-chloro (2H) -benzotriazol-2-yl] -4-methyl-5- (tert-butyl) phenol), TINUVIN 329 (Made by BASF Japan; 2- (2H) -benzotriazol-2-yl) -4- (1,1,3,3-tetramethylbutylphenol, TINUVIN 1577 (Made by BASF Japan; 2- (4,6-) Diphenyl-1,3,5-triazin-2-yl) -5-[(hexyl) oxy] -phenol), CYAS ORB UV-531 (manufactured by Cytec; 2-hydroxy-4- n-octoxybenzophenone, IRGANOX 565 (manufactured by BASF Japan), IRGANOX1035 (manufactured by BASF Japan), and the like.

In this embodiment, in order to remove aldehydes from the base material layer 19, the base material layer 19 including an adsorbent containing an amine compound is used. The adsorbent containing an amine compound is included in the base material layer 19 by dispersing the adsorbent in an aqueous solution, adding a small amount of a surfactant and a binder, and then immersing the base material layer 19 in the aqueous solution. There is a way to do it. Other methods include a method of spraying the aqueous solution described above onto the base material layer 19 and a method of applying the aqueous solution to the base material layer 19 with a brush or a roller. In addition, the method of including the radical scavenger in the fiber layer 20 is similarly a method of dispersing the radical scavenger in an organic solvent, adding an ultraviolet additive, and then immersing the fiber layer 20 in this solution. Examples thereof include a method of spraying the solution onto the fiber layer 20 and a method of applying the solution onto the fiber layer 20 with a brush or a roller.

Here, the concentration of the adsorbent on the sprayed surface can be increased by spraying the aqueous solution described above onto the base material layer 19 from only one surface and drying it. By making the surface having a high adsorbent concentration of the base material layer 19 into a close contact surface with the fiber layer 20, the content of the amine compound on the close contact surface between the base material layer 19 and the fiber layer 20 is high, and from the close contact surface As the distance increases, the filter medium 15 having a lower content can be obtained.

When installing the air filter 9 in the air cleaning device 1, the fiber layer 20 and the base material layer 19 are set in order from the intake port 10 side. In other words, the air filter 9 includes a fiber layer that is a preceding layer, that is, a fiber layer 20, and a fiber layer that is a subsequent layer provided downstream of the air flow with respect to the previous layer, that is, a base material layer 19. is there.

Thus, first, active components such as acidic substances and OH radicals are removed from the air sucked into the main body of the air cleaning device 1 with the fiber layer 20 containing the radical scavenger. Thereafter, the adsorbent containing the amine compound contained in the base material layer 19 is used to remove aldehydes such as formaldehyde. According to this configuration, the amine-based compound contained in the subsequent layer is less likely to react with acidic components in the air and active components such as OH radicals. Therefore, it is possible to provide the filter medium 15 that stably maintains the collection performance over a long period of time and the air cleaning device 1 using the filter medium.

(Embodiment 2)
Next, Embodiment 2 will be described with reference to FIG. The same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. FIG. 7 is a perspective view showing an air filter according to the second embodiment. As shown in FIG. 7, the air filter 29 used in the air cleaning device 1 shown in the present embodiment includes a base material layer 19 and a fiber layer 20 processed into a pleat shape, a frame portion 17, and a pre-filter. A filter 21 is provided.

The prefilter 21 is a non-woven fiber layer having a fiber diameter and openings necessary for collecting particles such as coarse dust, and is obtained by spraying and drying a radical scavenger. The pre-filter 21 can be made of a general nonwoven fabric or a net such as a net having a performance capable of collecting acidic substances contained in particles in the air, and preferably a static electricity capable of collecting particles using electric power. An electric filter may be used.

The air filter 29 integrated with the pre-filter 21 can be obtained by adhering the pre-filter 21 with an adhesive or the like so that no gap is generated in the frame portion 17. Here, if there is a gap between the pre-filter 21 and the frame portion 17, when the air cleaning device 1 sucks air, air containing radicals may come into contact with the adsorbent through the gap with low pressure loss. is there. Therefore, the base material layer 19 includes an adsorbent containing at least an amine compound, and the fiber layer 20 includes a radical scavenger.

When installing the air filter 29 in the air cleaning device 1, the prefilter 21, the base material layer 19, and the fiber layer 20 are installed in order from the intake port 10 side. That is, here, the filter medium 15 includes a pre-filter 21, a base material layer 19, and a fiber layer 20. The pre-filter 21 is a fiber layer that contains a radical scavenger as a preceding layer and can collect coarse dust. The base material layer 19 is disposed downstream of the prefilter 21 as a subsequent layer. The fiber layer 20 is disposed on the downstream side of the base material layer 19. The fiber layer 20 is a fiber layer different from the prefilter 21 and is a fiber layer containing a radical scavenger. That is, the filter medium 15 in the second embodiment is obtained by bonding the prefilter 21, the base material layer 19, and the fiber layer 20 so as to be integrated through the frame portion 17.

Thereby, from the air sucked into the main body of the air cleaning apparatus 1, first, acidic substances, active components such as OH radicals, and particles such as coarse dust are removed by the prefilter 21 containing a radical scavenger. Thereafter, an aldehyde such as formaldehyde can be removed with an adsorbent containing an amine compound contained in the base material layer 19. According to this configuration, it is possible to provide a filter medium that maintains the collection performance stably over a long period of time and an air cleaning device using the filter medium.

In particular, the air filter 29 according to the present embodiment includes a pre-filter 21 as a front layer, a base layer 19 as a rear layer, and a fiber layer 20 on the downstream side of the base layer 19. It is bonded so as to be integrated with each other. The prefilter 21 is a fiber layer that contains a radical scavenger and can collect particles. The base material layer 19 is a fiber layer containing an adhesive containing an amine compound. The fiber layer 20 is a fiber layer different from the prefilter 21 and is a fiber layer containing a radical scavenger. According to this configuration, since the prefilter 21, the base material layer 19, and the fiber layer 20 are bonded together via the frame portion 17, a part of the air passing through the air filter 29 is pressurized. It does not bypass certain high loss layers. Therefore, all the passing air passes through the prefilter 21, the base material layer 19, and the fiber layer 20 in order. That is, even when the opening of the pre-filter 21 is made smaller than that of the base material layer 19, the air that has passed through the pre-filter 21 can be passed through the base material layer 19 more reliably. An effect of removing aldehydes can be exhibited.

Further, as viewed from the base material layer 19, there is a radical scavenger contained in the prefilter 21 on the upstream side, and a radical scavenger contained in the fiber layer 20 on the downstream side. Therefore, the amine compound contained in the base material layer 19 is not directly exposed to active components such as acidic substances and OH radicals not only from the upstream side but also from the downstream side. According to this configuration, even when the operation of the air cleaning device 1 is stopped, the performance of the adsorbent contained in the base material layer 19 is hardly deteriorated, and the effect that the collection performance can be stably maintained for a long time is obtained. be able to.

Note that the prefilter 21, that is, the fiber layer capable of collecting particles as the previous layer may be the same as the fiber layer 20, or may have a larger opening of the filter medium than the fiber layer 20.

A filter medium according to the present invention and an air cleaning device using the filter medium include a base material layer and a fiber layer capable of collecting particles. The base material layer includes an adsorbent containing an amine compound. The fiber layer contains a radical scavenger and is in the form of a sheet in which the base material layer and the fiber layer are in close contact. Thereby, chemical substances such as formaldehyde can be effectively removed and the effect can be stably maintained over a long period of time, and it can be applied to a ventilator or the like that requires the same function.

DESCRIPTION OF SYMBOLS 1,100 Air purifier 2 Room 3 Floor 4 Wallpaper 5 Furniture 6 Window 7 Main body case 8

Blower part

9,29 Air filter 10 Intake port 11 Exhaust port 12 Casing 13 Blade 14 Electric motor 15,150 Filter medium 16 Shape holding part 17 Frame Part 18 Adhesive member 19 Base material layer 20 Fiber layer 21 Pre-filter 101 Air filter 102 Frame body 103 Blower 104 Air supply grill 105 Main body

Claims

A filter medium comprising a downstream layer on the downstream side of the air flow with respect to the upstream layer and the upstream layer, wherein the upstream layer includes a radical scavenger and is a fiber layer capable of collecting particles. ,
The latter layer is a fiber layer containing an adsorbent containing an amine compound,
A filter medium, characterized in that the front layer and the rear layer are in a sheet-like form.
2. The filter medium according to claim 1, wherein the amine compound is applied to a surface of a fiber constituting the rear layer.
The filter medium according to claim 1, wherein the radical scavenger contains at least one of hindered amines, hindered phenols, and benzotriazoles.
2. The filter medium according to claim 1, wherein the content of the amine compound in the subsequent layer is high on the side of the contact surface with the front layer and decreases as the distance from the contact surface increases.
A main body case having an intake port and an exhaust port, a blower provided in the main body case, and an air filter provided between a suction side of the blower and the intake port, wherein the air filter includes: An air purifier comprising the filter medium described above.
In addition to the prefilter as the preceding layer and the base material layer as the subsequent layer, the air filter is a fiber layer different from the preceding layer disposed on the downstream side of the base material layer. A fiber layer containing a scavenger, and a frame portion, and the prefilter, the base material layer, and a fiber layer different from the preceding layer are both integrated with each other via the frame portion. The air purifier according to claim 5, wherein the air purifier is attached to the air intake side of the main body case.