JPH11165007A - Environmental pollutant removing filter and air purifier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air purifying filter and an air purifier capable of effectively removing environmental pollutant with the filtration and removal of dust in the room of a housing or the like. SOLUTION: The filter is formed by combining an environmental pollutant gas removing material 11 with a high performance dust removing material. The filter is fitted to the air purifier. As the environmental pollutant gas removing material, a sheet like material, which contains a metal and/or a metal oxide particle (a), an adsorbent particle (b), a thermosetting resin particle (c) and a fibrous base material (e) of an air permeable sheet and in which the particle (a) and particle (b) are combined with each other at the contact part of the particles on the surface of the particle (c) and the particle (c) is combined with the base material (e), is preferably used and as the high performance dust removing material, a HEPA filter is preferably used.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an environmental pollutant removing filter and an air purifier for effectively filtering and removing dust and environmental polluting gas in rooms such as houses, offices, and vehicles.

[0002]

2. Description of the Related Art Volatile organic compounds (VOCs) such as formaldehyde and toluene generated from structural materials such as plywood, decorative boards, adhesives, and paints with the increase in secrecy of houses, offices, and vehicles, Health problems due to allergens such as molds and ticks have become a problem. Examples of the environmental pollutant gas removing material (or deodorizing material) include, for example, Ag, MnO ₂ , NiO, and Cu.
Deodorization in which a mixture of a catalytically active component selected from O, Fe ₂ O ₃ , Co ₃ O _{4 and the} like and an oxide selected from Li ₂ O, K ₂ O, Na ₂ O, CaO and the like is supported on an oxide carrier. Material (JP-A-6-7678), metal oxide particles, adsorbent particles, thermoplastic resin particles, and a fibrous base material of a breathable sheet. A sheet-like deodorizing material (PCT International Publication WO96 / 37288), in which the thermoplastic resin particles are bonded to the surface of the resin particles at a contact portion between the particles and the thermoplastic resin particles are bonded to the fibrous base material, has been proposed.

[0003]

However, these deodorizing materials can remove odorous components and harmful gas components, but remove particulate matter such as mold, mites, dust, and tobacco dust in the air. I can't. Further, there is a problem that the life of the deodorizing material is shortened if dust or tobacco particles adhere to the catalyst surface. An object of the present invention is to provide an air purifying filter and an air purifier capable of filtering and removing dust in a room such as a house and effectively removing environmental polluting gas.

[0004]

SUMMARY OF THE INVENTION The present invention is an environmental pollutant removal filter comprising a combination of an environmental pollutant gas removing material and a high-performance dust removing material. The present invention also relates to an air purifier provided with the above-mentioned environmental pollutant removal filter.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The high-performance dust removing material used in the environmental pollutant removing filter of the present invention is a removing material capable of efficiently removing dust in the air, and is preferably HEP.
A filter (capable of collecting 99.97% or more of 0.3 μm dust), VEPA filter (capable of collecting 99.9997% or more of 0.1 μm dust), ULPA filter (capable of collecting 0.05 μm of dust 99% or more) .99995% or more). Pollen (1)
0-100 μm), dust (30-500 μm), cigarette smoke (around 0.1 μm), bacteria (0.3-20 μm)
Etc. can be removed.

Examples of the environmental pollutant removing material used in the filter for removing environmental pollutants of the present invention include odorous and harmful gases such as hydrogen sulfide, ammonia, carbon monoxide and ozone, and volatile organic compounds (VOC) such as formaldehyde and toluene. )
One of the preferred forms is (a) metal and / or metal oxide particles,
(B) adsorbent particles, and (c) thermoplastic resin particles, wherein the particles (a) and (b) are bonded to the surface of the particles (c) at a contact portion between the particles, and (C)
These are air-permeable granular removal materials that are joined at their respective contact portions.

[0007] The particulate removing material having air permeability can be manufactured as follows. That is, (a) metal and / or metal oxide particles, (b) adsorbent particles, and (c) thermoplastic resin particles are mixed, and the thermoplastic resin (c) is mixed in a mixer.
Is heated at a temperature not lower than the melting point and not higher than the thermal decomposition temperature. The surface layer of the thermoplastic resin particles is softened by heating, so that the thermoplastic resin particles have a bonding force. The thermoplastic resin particles whose surface layer softens and has a bonding force, while maintaining its spherical particle shape,
Particles (a) and (b) are captured and bound on the surface, and the thermoplastic resin particles (c) are bound to each other at a contact portion between each other to obtain a porous body. The obtained porous body can be used as it is, or can be pulverized into a granular form.

Another preferred form of the environmental pollutant gas removing material that can be used is (a) metal and / or metal oxide particles, (b) adsorbent particles, (c) thermoplastic resin particles, and (D) a cylindrical base material, wherein the particles (a) and (b) are bonded to a surface of the particle (c) at a contact portion between the particles, and the particles (c) are bonded to the base material ( This is a gas-permeable tubular removing material bonded to d).

Another preferred form of the environmental pollutant gas removing material that can be used is (a) metal and / or metal oxide particles, (b) adsorbent particles, and (c) thermoplastic resin particles. And (e) a fibrous base material of an air-permeable sheet, wherein the particles (a) and (b) are bonded to the surface of the particles (c) at a contact portion between the particles, and the particles (c) )
Is a breathable sheet-shaped removing material bonded to the base material (e). This sheet-shaped removing material may be covered with a protective sheet having air permeability in order to prevent the surface from being stained or damaged.

The above-mentioned tubular or sheet-like material for removing environmental pollutant gas can be manufactured as follows. A suspension in which (a) metal and / or metal oxide particles, (b) adsorbent particles, (c) thermoplastic resin particles, (f) water-absorbent resin, and (g) water are uniformly dispersed. A liquid is prepared, and a predetermined amount of the suspension is held on (d) a tubular base material or (e) a fibrous base material of a breathable sheet, and then the melting point of the thermoplastic resin (c) is maintained. The heating is performed at a temperature not higher than the thermal decomposition temperature for a predetermined time. The water is evaporated and removed, and the surface of the thermoplastic resin particles is softened to have a bonding force. The thermoplastic resin particles whose surface layer has softened to have a bonding force have particles (a) and (b) on their surfaces while maintaining their spherical particle shape.
And the thermoplastic resin particles (c) are bonded to each other at a contact portion between the thermoplastic resin particles (c) and the cylindrical base material or the fibrous base material.

The above-mentioned environmental pollutant gas removing material is combined with a high-performance dust removing material to form a filter unit, which is incorporated into an air purifier. In the state where it was incorporated in the air purifier,
The porosity of the material for removing environmental polluting gas is preferably 50% or more (more preferably 80% or more), its specific surface area is preferably 20 m ² / g or more, it is air-permeable and the pressure loss is
It is preferably at least 6 mmaq.

The metal and / or metal oxide particles (a) used in the environmental pollutant gas removing material include manganese,
Copper, zinc, iron, vanadium, nickel, magnesium,
Aluminum, titanium, palladium, platinum, cerium,
There are particles of silicon and these oxides. Particles of these metal composite oxides may be used. Examples of the manganese oxide include MnO ₂ , MnO, Mn ₂ O ₃ , Mn ₂ O ₃ , and among them, MnO ₂ is preferably used. Examples of the copper oxide include CuO and Cu ₂ O, and among them, CuO is preferably used. One kind of these metal and / or metal oxide particles may be used, but two or more kinds may be used in order to have a function of purifying various kinds of harmful substances. As a preferable example in the case of mixing two or more kinds, there is one containing manganese dioxide particles and cupric oxide particles.

The adsorbent particles (b) include activated carbon, zeolite, silica gel, sepiolite, activated alumina and activated clay. The adsorbent particles carrying aluminum sulfate, iodine, ferrous sulfate, calcium phosphate, sodium carbonate, magnesium silicate, boric acid, phosphoric acid, ascorbic acid, tartaric acid, oxalic acid, tannic acid, gallic acid, etc. are also used. be able to. One type of adsorbent particles may be used, or two or more types may be used. Activated carbon includes vegetable carbonaceous materials (coconut shell, almond shell, etc.), charcoal,
In addition to bituminous coal, carbonaceous synthetic resin (phenolic resin, etc.)
And any of them can be used.

The thermoplastic resin particles (c) include ultrahigh molecular weight polyethylene, polyethylene, polycarbonate,
Polyamide ABS resin, polyimide, polyvinyl chloride,
The particles are selected from polysulfone, polyethylene terephthalate, polypropylene, cellulose acetate and the like. These thermoplastic resin particles are obtained by forming metal and / or metal oxide particles (a) and adsorbent particles (b) on the surface of the thermoplastic resin particles (c) without being covered with the thermoplastic resin layer. It has a role as a binder to bind at the contact part. Among the thermoplastic resin particles, ultrahigh molecular weight polyethylene is preferably used, and its average molecular weight (measured by a viscosity method) is about 1,000,000 to 9,000,000.

The cylindrical substrate (d) has a size of 2 mm
A hollow cylindrical base material of about 10 mm can be used.
The material may be any of synthetic resin, glass, metal, paper, wood, cloth and the like.

As the fibrous base material (e) of the breathable sheet, a fibrous base material having a porosity of 60% to 99% is used.
For example, glass woven fabric / non-woven fabric, plastic woven fabric / non-woven fabric of polyethylene, polypropylene, polyamide, polyester and the like, paper and the like.

The metal and / or metal oxide particles (a) used have an average particle size of 0.1 to 10 μm,
The size of the adsorbent particles (b) is such that particles passing through a sieve opening 48 mesh (diameter of 300 μm) occupy 50% or more of the adsorbent particles (b) by weight, thermoplastic resin The size of the particles (c) is 20 in average particle size.
Thicknesses of up to 150 μm are usually used.

The reason for adding the water-absorbing resin is that an aqueous suspension of mixed particles of metal and / or metal oxide particles (a), adsorbent particles (b) and thermoplastic resin particles (c) is uniformly dispersed. That's why. When the water-absorbent resin is added, the water-absorbent resin absorbs water and the viscosity increases, so that the suspension of the mixed particles is uniformly dispersed, and furthermore, the uniformly dispersed state is stably maintained for a long time. It is.

The air purifier of the present invention comprises the above-mentioned filter (filter unit) for removing environmental pollutants, a suction unit, an exhaust unit, intake / exhaust means such as a fan, a control unit for the intake / exhaust means, a power supply, And are usually provided.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. Embodiment 1 FIG. 1 shows an example of an environmental pollutant removal filter (filter unit) in which a cylindrical gas removing material and a high performance (HEPA) filter are combined, and two cylindrical gas removing materials and a high performance (HEPA) filter are used. The structure is sandwiched between non-woven fabrics. In the figure, 10 is a HEPA filter, 12 is a nonwoven fabric made of polyester, 13 is a cylindrical environmental pollutant gas removing material, and 14 is a filter support frame. The cylindrical gas removing material is obtained by dispersing manganese dioxide and copper oxide in water containing a water-absorbent resin, immersing a hollow cylinder made of polyester (outer diameter 3 mm × height 5 mm), taking out, and drying by heating at 160 ° C. And those manufactured.

Embodiment 2 FIG. 2 shows an example of an environmental pollutant removal filter (filter unit) combining a sheet-like gas removing material and a high-performance (HEPA) filter. This is a structure in which a high-performance (HEPA) filter is sandwiched between two nonwoven fabrics. In the figure, 10 is a HEPA filter, and 11 is a sheet-like gas removing material. The sheet-like gas removing material disperses manganese dioxide and copper oxide in water-absorbing resin-containing water, and immerses a sheet-like glass nonwoven fabric in this,
It was taken out, dried by heating at 160 ° C., and used. The amount of manganese dioxide and copper oxide used in the sheet-shaped gas removing material 11 was manganese dioxide: copper oxide = 9: 11 (weight ratio).
The adhesion amount was 40 g per m ² .

Embodiment 3 FIG. 3 shows an example of the air purifier of the present invention. The main body case 1 of the air purifier is provided with a suction port 2 and an exhaust port 6. When an ON signal is transmitted by the switch 7, power is supplied from the external power supply terminal 5 to the motor 4 by the control board 8. Is done. Air containing dust and environmental pollutant gas is sucked in from the inlet 2 by a fan (sirocco fan) 3 rotated by the rotational power of the motor 4, and the dust and environmental pollutant gas are removed by the filter unit 9. The air from which the dust and environmental pollutant gas have been removed is exhausted from the air outlet 6 to the outside of the air purifier.

[0023]

The filter for removing environmental pollutants and the air purifier using the filter according to the present invention are capable of removing odorous and harmful gases such as hydrogen sulfide, ammonia, carbon monoxide, ozone, etc.
Volatile organic compounds (VOC) such as formaldehyde and toluene generated from structural materials such as decorative boards, adhesives, and paints
At the same time, particulate matter (allergens) such as molds and mites can be removed.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing one embodiment of an environmental pollutant removal filter of the present invention.

FIG. 2 is a schematic sectional view showing another embodiment of the filter for removing environmental pollutants of the present invention.

FIG. 3 is a schematic plan view showing one embodiment of the air purifier of the present invention.

[Explanation of symbols]

1. 1. Body case of air purifier Inlet 3. Fan (Sirocco fan) Motor 5. External power supply terminal 6. Exhaust port 7. Switch 8. Control board 9. Environmental pollutant removal filter 10. High-performance dust removal filter 11. 11. Sheet-like environmental pollutant removal material Non-woven fabric 13. Cylindrical pollutant removal material 14: Filter support frame

Continued on the front page (72) Inventor Shinya Fujie 1250 Shimoe-ren, Shimodate-shi, Ibaraki Pref.

Claims (6)

[Claims] An environmental pollutant removal filter comprising a combination of an environmental pollutant gas removing material and a high-performance dust removing material. 2. The environmental pollutant gas removing material comprises (a) metal and / or metal oxide particles, (b) adsorbent particles, and (c) thermoplastic resin particles, wherein said particles (a) and particles ( The b) is a gas-permeable particulate removing material which is bonded to the surface of the particles (c) at the contact portions of the particles and the particles (c) are bonded at the respective contact portions. Environmental pollutant removal filter. 3. The environmental pollutant gas removing material comprises (a) metal and / or metal oxide particles, (b) adsorbent particles, (c) thermoplastic resin particles, and (d) a cylindrical substrate. The particle (a) and the particle (b) are bonded to the surface of the particle (c) at a contact portion between the particles, and the particle (c) is bonded to the substrate (d). The environmental pollutant removal filter according to claim 1, wherein the filter is a tubular removal material. 4. The fibrous base material of (a) metal and / or metal oxide particles, (b) adsorbent particles, (c) thermoplastic resin particles, and (e) a breathable sheet. The particles (a) and (b) are bonded to the surface of the particles (c) at a contact portion between the particles, and the particles (c) are bonded to the base material (e). The environmental pollutant removal filter according to claim 1, which is a sheet-like removal material having air permeability. 5. The environmental pollutant removal filter according to claim 1, wherein the high-performance dust removal material is a dust removal material capable of collecting 99.97% or more of 0.3 μm dust. 6. An air purifier provided with the filter for removing environmental pollutants according to claim 1.