JP2019166513A - Dust collection deodorizing filter material and dust collection deodorizing filter - Google Patents

Abstract

To provide a dust collection deodorizing filter material and a dust collection deodorizing filter that are improved in dust collection performance, while suppressing a pressure drop of the filter material to be low.SOLUTION: A dust collection deodorizing filter material, and a dust collection deodorizing filter comprising the dust collection deodorizing filter material are provided. In the dust collection deodorizing filter material, encapsulating an adsorbent between a substrate A and a substrate B: at least either the substrate A or the substrate B is a thermally bonded nonwoven sheet containing an ethylene propylene copolymer fiber and a polypropylene fiber, with basis weight of 20-200 g/m; dust collection efficiency of particles equal to 0.3 μm or larger is 30% or higher under a surface wind velocity of 5.3 cm/sec in the dust collection deodorizing filter material; and a pressure drop is 10.0 Pa or less.SELECTED DRAWING: None

Description

  The present invention relates to a dust collection deodorizing filter medium and a dust collection deodorization filter.

  In general, a deodorizing filter uses a filter medium in which granular or powdered activated carbon or the like is sealed between two substrates, or a filter medium prepared by applying or impregnating an activated carbon dispersion to a substrate. By blending a large amount of the agent, high deodorizing performance can be achieved.

  On the other hand, a dust collection deodorization filter can be made by using a base material having dust collection performance for the filter medium of the above deodorization filter. However, when a base material having high dust collection performance is used, the pressure loss (pressure loss) of the filter tends to be high as a whole. For this reason, when designing a dust collection deodorizing filter medium and a dust collection deodorization filter with improved dust collection performance while keeping the pressure loss low, it is necessary to consider the balance of deodorization performance, dust collection performance, and pressure loss.

  As a filter with dust collection and deodorization performance and low pressure loss, dust collection performance and deodorization can be achieved by enclosing an adsorbent between the antibacterial and antifungal substrate A and the dust collection substrate B. Air cleaning filters with excellent performance have been proposed. However, although the dust collection deodorization filter has a low pressure loss, the dust collection performance is generally insufficient (see, for example, Patent Document 1).

  Also, a laminated structure composed of a three-layer nonwoven fabric comprising a retaining nonwoven fabric containing an adsorbent retained by a binder and a catalyst component that decomposes the adsorbed gas, and a dust collecting nonwoven fabric sandwiching the retaining nonwoven fabric therebetween In this deodorization filter, a dust collection deodorization filter characterized by containing solid superacid particles in the non-woven fabric for dust collection located upstream of the air flow has also been proposed, but the filter has good dust collection performance. However, pressure loss is high and the said subject is not cleared (for example, refer patent document 2).

There is little increase in pressure loss at the time of pressurization, excellent collection performance, particularly a mixed fiber nonwoven fabric containing at least two kinds of fiber groups for the purpose of being suitably used for an air filter, wherein the first fiber group is Each fiber diameter is 7.0 μm or less consisting of a polyolefin-based resin component A, each fiber diameter is 15 μm to 100 μm, and each fiber diameter is 15 μm to 100 μm in the length direction of the mixed nonwoven fabric. The tensile strength is 0.45 (N / 5 cm) / (g / m ² ) or more per unit weight, and the pressure loss after applying a load of 6 kg / cm ^{2 to} the mixed fiber nonwoven fabric is 25% or less. A mixed fiber nonwoven fabric characterized by this has been proposed. Moreover, it is a single layer mixed fiber nonwoven fabric containing fibers having different single fiber diameters, and the group consisting of fibers having a single fiber diameter of 0.3 to 10 μm is defined as a fiber group A, and the single fiber diameter is composed of fibers having a single fiber diameter of 60 to 120 μm. When the group is a fiber group B, the fiber group A is divided into four areas of 1 to 4 in order from the front surface side evenly in the thickness direction, and the fiber group A includes the front surface area 1 and the back surface side. The distribution density in the region 4 is higher than the distribution density in the central regions 2 and 3, and the fiber group A is also present in the central regions 2 and 3, respectively. A specific nonwoven fabric that can be suitably used for an air filter while exhibiting high collection efficiency and a pressure loss is low, and a filter medium using the same are also proposed. These filter media use a non-woven fabric manufactured by a mixed fiber melt blown method, and a filter using the filter media has good dust collection performance, but has a relatively high pressure loss, and the problem is not cleared. (For example, refer to Patent Documents 3 and 4).

  Furthermore, in order to improve the filtration accuracy and prolong the filtration life, a specified non-woven fabric is used which is a mixture of fine fineness conjugate fiber with ultra-fine spiral crimp and thick fineness conjugate fiber with obvious crimp. Filter media for filters have been proposed. In addition, it is a filter with high separation performance, and a hydrophilic agent is melt blended for the purpose of eliminating the occurrence of air locks and micro bubbles in the filtration operation of aqueous liquids and improving the problem of poor water flow and bubble generation. A non-woven fabric made of ultrafine fibers having an average fiber diameter of 0.1 to 10.0 μm obtained from at least one polyolefin composition that can be melt-spun at a temperature of 260 ° C. or less is used for at least a part of the filter medium. A filter was also proposed. These nonwoven fabrics are also manufactured by the melt blown method, and both the filters have good dust collection performance, but the pressure loss is relatively high and the problem is not cleared (see, for example, Patent Documents 5 and 6).

JP 2000-70646 A JP 2002-331212 A Japanese Patent Laying-Open No. 2015-161041 Japanese Patent Laid-Open No. 2006-160542 Japanese Patent Laid-Open No. 11-19434 JP 2009-195898 A

  The subject of this invention is providing the dust collection deodorizing filter material and dust collection deodorizing filter which improved dust collection performance, keeping pressure loss low.

  As a result of intensive studies to solve the above problems, the following dust collection deodorizing filter medium and dust collection deodorization filter have been invented.

(1) In the dust collection deodorizing filter medium formed by enclosing an adsorbent between the base material A and the base material B, at least one of the base material A and the base material B has a basis weight of 20 to 200 g / m ² . Thermally bonded nonwoven fabric sheet containing ethylene / propylene copolymer fiber and polypropylene fiber, and the collection efficiency of particles of 0.3 μm or more is 30% at a surface wind speed of 5.3 cm / sec in the dust collection deodorizing filter medium. A dust collection deodorizing filter medium having a pressure loss of 10.0 Pa or less.
(2) The dust collection deodorizing filter medium according to (1), wherein the thermal bond nonwoven fabric sheet containing the ethylene / propylene copolymer fiber and the polypropylene fiber is a charged sheet.
(3) A dust collection deodorization filter using the dust collection deodorization filter medium of (1) or (2).

  The dust collection deodorization filter medium of the present invention can provide a dust collection deodorization filter medium and a dust collection deodorization filter that have improved dust collection performance while keeping pressure loss low.

  Below, the component of the dust collection deodorizing filter material and dust collection deodorization filter of this invention is demonstrated in detail.

The dust collection deodorization filter medium of the present invention is a dust collection deodorization filter medium in which an adsorbent is sealed between the base material A and the base material B. At least one of the base material A and the base material B has a basis weight of 20 to 20%. 200 g / m ² of a thermal bond nonwoven fabric sheet containing ethylene / propylene copolymer fiber and polypropylene fiber, and particles having a particle size of 0.3 μm or more at a surface wind speed of 5.3 cm / sec in a dust collection deodorizing filter medium The collection efficiency is 30% or more, and the pressure loss is 10.0 Pa or less.

First, “a thermal bond nonwoven fabric sheet containing ethylene / propylene copolymer fibers and polypropylene fibers having a basis weight of 20 to 200 g / m ² ” will be described. In the present invention, “thermal bond nonwoven fabric sheet containing ethylene / propylene copolymer fiber and polypropylene fiber” may be abbreviated as “sheet of ethylene / propylene copolymer and polypropylene”.

The basis weight of the ethylene / propylene copolymer and polypropylene sheet is 20 to 200 g / m ² . By being in this range, the filter medium is excellent in handling, and the pleat folding processability and filter processability of the filter medium are excellent. The basis weight of the ethylene / propylene copolymer and polypropylene sheet is more preferably 25 to 180 g / m ² , and still more preferably 30 to 150 g / m ² .

  The sheet of ethylene / propylene copolymer and polypropylene is a non-woven sheet containing ethylene / propylene copolymer fibers and polypropylene fibers. The content is 10 to 90% by mass for the former and 90 to 10% by mass for the latter. It is preferable that the sheet is processed at an arbitrary ratio.

  In order to functionalize the sheet, a polyamide fiber, a polyester fiber, a polyalkylene paraoxybenzoate fiber, a polyurethane fiber, a polyvinyl alcohol fiber, a polyvinylidene chloride fiber, and a polyvinyl chloride fiber are used as necessary at the time of processing. , Polyacrylonitrile fiber, polyolefin fiber other than ethylene / propylene copolymer fiber and polypropylene fiber, synthetic fiber such as phenol fiber, glass fiber, metal fiber, alumina fiber, inorganic fiber such as activated carbon fiber, wood pulp, Natural fibers such as hemp pulp and cotton linter pulp, recycled fibers, or fibers obtained by imparting functions such as hydrophilicity and flame retardancy to these fibers can also be used.

  The production method of the ethylene / propylene copolymer and polypropylene sheet is not particularly limited and can be adopted from a general nonwoven fabric production method, but the dust collection performance is improved while keeping the pressure loss low. In order to produce a dust collection deodorizing filter medium, a thermal bond is employed in the present invention.

  The average thickness of the ethylene / propylene copolymer and polypropylene sheet is preferably 0.1 to 50 mm, and more preferably 0.2 to 20 mm. When the thickness is within this range, the pleat folding processability and filter processability of the filter medium become excellent. Moreover, the thing with few fluff of a fiber is good. A material with a lot of fiber fluffing may adversely affect the handling of the filter medium, the pleat foldability of the filter medium, and the filter processability. In addition, the thickness of the sheet | seat was measured at 10 places at random with the dial thickness gauge of the scale of 0.01 mm type (made by Niigata Seiki Co., Ltd., model DS-1211), and it calculated | required as an average value.

  The ethylene / propylene copolymer / polypropylene sheet may be subjected to a charging process on the sheet surface for the purpose of further improving the dust collecting ability.

  The method of charging the nonwoven fabric sheet is a method of applying an electric charge by friction, contact, a method of irradiating an active energy ray (for example, electron beam, ultraviolet ray, X-ray, etc.), a method of using a corona discharge, a gas discharge such as plasma, A method using a high electric field and a known method such as a hydrocharging method using a polar solvent such as water are selected without limitation, but because a high chargeability can be obtained with a relatively low amount of electric power. It is preferable to charge by a corona discharge method or a hydrocharging method.

  The corona discharge method and the hydrocharging method are performed using a known apparatus under conditions according to the purpose and application.

The dust collection deodorization filter medium of the present invention is a dust collection deodorization filter medium in which an adsorbent is sealed between the base material A and the base material B. At least one of the base material A and the base material B has a basis weight of 20 to 20%. 200 g / m ² of ethylene / propylene copolymer and polypropylene sheet. “Base materials that can be used other than sheets of ethylene / propylene copolymer and polypropylene having a basis weight of 20 to 200 g / m ² (other base materials)” include paper, woven fabric, non-woven fabric, net, and sponge. Etc. In addition, thermoplastic films such as polyethylene films, polypropylene films, and polyester films, and thin plates are also included. A sheet having poor air permeability, such as a thermoplastic film or a thin plate, may be improved by making fine holes. Among these, non-woven fabrics are more preferable because they can ensure relatively uniform air permeability and are easy to encapsulate.

  Other base materials include polyamide fibers, polyester fibers, polyalkylene paraoxybenzoate fibers, polyurethane fibers, polyvinyl alcohol fibers, polyvinylidene chloride fibers, polyvinyl chloride fibers, polyacrylonitrile fibers, polyolefin fibers Fiber, synthetic fiber such as phenolic fiber, glass fiber, metal fiber, alumina fiber, inorganic fiber such as activated carbon fiber, natural fiber such as wood pulp, hemp pulp, cotton linter pulp, recycled fiber, or hydrophilic to these fibers The fiber etc. which provided functions, such as property and a flame retardance, can be used.

  There are no particular restrictions on the production method of other base materials, and webs obtained by the dry method, wet papermaking method, melt blown (melt blow) method, spun bond method, etc., can be used according to the purpose and application. Manufacture by physical methods such as thermal bonding methods, thermal bonding methods such as thermal bonding methods, bonding methods using adhesives such as resin bonds, methods that combine a plurality of these, and methods that develop strength if necessary Can do. Moreover, you may perform an electrification process in order to improve dust collection performance to another base material.

  Although the thickness of another base material is not specifically limited, 0.1-50 mm is preferable on average, More preferably, 0.2-20 mm is good. When the thickness is within this range, the pleat folding processability and filter processability of the filter medium become excellent. Moreover, the thing with few fluff of a fiber is good. A material with a lot of fiber fluffing may adversely affect the handling of the filter medium, the pleat foldability of the filter medium, and the filter processability.

  In the present invention, a water repellent and a flame retardant may be added to the substrates A and B as necessary.

  Air filters are classified as general filters with relatively low collection efficiency, and are relatively long-life and low-pressure loss coarse dust filters; medium / fine dust filters; medium-performance filters; high-performance filters; It is classified as an ultra-high performance filter exceeding 7%. High performance filters using non-woven fabrics such as HEPA and ULPA have high dust collection performance but tend to have high pressure loss. Therefore, it is difficult to provide a dust collection deodorization filter medium and a dust collection deodorization filter with improved dust collection performance while suppressing pressure loss with a filter medium base material used for general high performance filters and ultra high performance filters. .

In order to provide a dust collection deodorizing filter medium and a dust collection deodorization filter with improved dust collection performance while keeping the pressure loss low, the dust collection deodorization filter medium of the present invention is JIS B 9908: 2011 “Air Filter Unit for Ventilation / Ventilation In the test method format 1 of “Performance test method of electrostatic precipitator”, the collection efficiency of particles of 0.3 μm or more measured at a surface wind speed of 5.3 cm / sec is 30% or more, and the pressure loss is 10.0 Pa. It is as follows. The dust collection deodorizing filter medium of the present invention is formed by sealing an adsorbent between the base material A and the base material B, and at least one of the base material A and the base material B has a basis weight of 20 to 200 g / m ^2. This collection efficiency and pressure loss can be achieved by using an ethylene / propylene copolymer and polypropylene sheet. The collection efficiency is more preferably 40% or more.

In the present invention, a wide variety of materials can be used as the adsorbent. Examples include activated carbon, impregnated activated carbon, activated clay, natural and synthetic zeolite, sepiolite, iron-based compounds such as iron oxide, zinc oxide, magnesium oxide, silica, silica-zinc oxide composite, silica-alumina-zinc oxide composite, Examples thereof include manganese dioxide, complex phyllosilicate, cyclodextrin, a mixture of ascorbic acid and divalent iron salt, a mixture of vitamin B group and phosphate, or a mixture thereof. Although the shape of these adsorbents is not particularly limited, a particulate form is preferable, and an adsorbent having a specific surface area of 50 to 2000 m ² / g can be appropriately selected and used. For example, in the case of activated carbon, the specific surface area is preferably 500 to 1500 m ² / g.

  The adsorbent sealing method is a method in which a mixture of an adsorbent and a thermoplastic binder is spread on the base material A or base material B, covered with the base material B or base material A, and heated and fixed with a dryer or the like, Heat can be applied to the base material A or base material B on which the mixture has been sprayed with a dryer or the like, and the binder can be melted and encapsulated by a method such as covering with the base material B or base material A.

  The amount of adsorbent enclosed can be appropriately changed according to the deodorizing performance to be set.

  The dust collection and deodorization filter medium of the present invention can be provided with antibacterial / antifungal functions as necessary. Antibacterial / antifungal on the surface and inside of the sheet by impregnation coating, adhesion by binder, heat fusion by hot melt, spray coating, etc. to one or more selected from the group of base material A, base material B and adsorbent An antibacterial and antifungal function can be imparted to the dust collection deodorizing filter medium by a method such as adding an agent.

  The antibacterial / antifungal agent may be contained in any part of the dust collection deodorizing filter member. However, when it is contained in the base material A on the upstream side, the antibacterial / antifungal agent contained in the base material A works. However, in the case where bacteria and moths are generated after passing through the base material B, for example, the antibacterial and antifungal properties cannot be sufficiently exhibited. Further, if the base material A, the base material B, and the adsorbent all contain an antibacterial / antifungal agent, the antibacterial / antifungal property can be sufficiently exhibited, but the cost is excessive. Therefore, if it is contained in the base material B on the downstream side, the cost can be minimized, and it is more effective in preventing the growth of bacteria and cocoons.

  The antibacterial / antifungal agent exhibits a sufficient effect even at a solid content of about 1% by mass or less, and can be used in a considerably low amount only by the agent alone. In addition, for example, cellulose-processed antibacterial / antifungal fibrous materials are partly used as a so-called masterbatch, which is said in the resin industry, and used in combination with other unprocessed fibers. This mode is easy to manage and highly practical, and is preferably used.

  In the present invention, a dust collection deodorization filter medium may be used as a sheet as a dust collection deodorization filter in a device such as an air conditioner or an air purifier, but the collection area is increased by pleating. A dust deodorizing filter is more effective in improving dust removal performance. Moreover, the dust collection deodorizing filter material which gave the pleating process is good to use it as a filter of the form installed in the frame which surrounded the four sides with the frame material. In addition, the material of the frame material used here is not particularly limited, and is appropriately selected from paper, cloth, nonwoven fabric, metal, resin, wood, and the like.

  EXAMPLES Hereinafter, although an Example demonstrates this invention in detail, this invention is not limited to an Example. The number of parts and percentages in the examples are based on mass unless otherwise specified.

[Measuring method]
(1) Pressure loss of filter medium A flat filter medium is set in a holder having an effective frontage area of 0.1 m ² , air is passed in the vertical direction at a surface wind speed of 5.3 cm / sec, and the pressure difference between the upstream and downstream of the filter medium is measured by a manometer. Measure with a differential pressure gauge. The measurement is performed by sampling five points arbitrarily from one specimen, and the average value is set as a pressure loss (single plate pressure loss).

(2) Filtering medium collection efficiency A flat filter medium is set in a holder having an effective frontage area of 0.1 m ² , and air is passed in the vertical direction at a surface wind speed of 5.3 cm / sec. The number of particles (atmospheric dust) of 0.3 μm or more is measured with a particle counter (manufactured by RION, model: KC-01D), and calculated from the following formula.

Collection efficiency η (%) = (1− (number of downstream particles / number of upstream particles)) × 100

  The measurement is performed by sampling arbitrarily five points from one sample, and the average value is taken as the collection efficiency.

(3) Pressure loss of the air filter unit Set the air filter unit with the evaluation equipment according to the test method format 1 of JIS B9908 (2011) and flow air at a surface wind speed of 1.0 m / sec. The pressure difference between upstream and downstream is measured with a manometer differential pressure gauge. Five samples are measured, and the average value is taken as the pressure loss.

(4) Air filter unit collection efficiency With the same evaluation equipment as (3), set the air filter unit, supply general outside air from the upstream side, and particles of 0.3 μm or more upstream and downstream of the air filter unit The number of (atmospheric dust) is measured with a particle counter (manufactured by RION, model: KC-01D) and calculated from the following formula.

Collection efficiency η (%) = (1− (number of downstream particles / number of upstream particles)) × 100

  Five samples are measured, and the average value is taken as the collection efficiency.

[Example 1]
(Preparation of dust collection deodorizing filter media)
As the substrate A, an ethylene-propylene copolymer and polypropylene sheet (basis weight 95g ^{/ m} 2), it was used polypropylene spunbonded nonwoven sheet (basis weight 16g / ^{m 2)} as a substrate B. As an adsorbent, 100 parts by mass of 32 to 60 mesh activated carbon and 43 parts by mass of ethylene vinyl acetate resin powder as a 50 mesh thermoplastic binder were mixed in advance to prepare a mixed powder. The mixed powder was sprayed onto the base material A so as to be 140 g / m ² and bonded to the base material B by heating to produce a dust collection deodorizing filter medium 1. It was 8.1 Pa as a result of measuring the pressure loss of the said dust collection deodorizing filter medium. Moreover, the collection efficiency of particles of 0.3 μm or more was 51.6%.

(Air filter unit)
Dust collection deodorizing filter medium 1 is pleated, and 50 piles are stored in a frame of length 250mm, width 250mm, thickness 20mm, and polyolefin hot melt resin with a melting point of 95 ° C is used for reinforcement in the direction of air filter inflow. Two filter ribbons were evenly processed to obtain a filter unit 1. The pressure loss of the unit was 81 Pa. Moreover, the collection efficiency of particles of 0.3 μm or more was 26.9%.

[Example 2]
(Preparation of dust collection deodorizing filter media)
A dust collection deodorizing filter medium 2 was produced in the same manner as in Example 1 except that an ethylene / propylene copolymer and a polypropylene sheet (basis weight 25 g / m ² ) were used as the substrate A. The dust collection deodorizing filter medium had a single plate pressure loss of 3.5 Pa and a particle collection efficiency of 36.0%.

(Air filter unit)
A filter unit 2 was obtained in the same manner as in Example 1 using the dust collection deodorizing filter medium 2. The unit had a pressure loss of 47 Pa and a particle collection efficiency of 23.3%.

[Example 3]
(Preparation of dust collection deodorizing filter media)
A dust collection deodorizing filter medium 3 was produced in the same manner as in Example 1 except that an ethylene / propylene copolymer and a polypropylene sheet (basis weight 50 g / m ² ) were used as the substrate A. The dust collection deodorizing filter medium had a single plate pressure loss of 6.2 Pa and a particle collection efficiency of 46.2%.

(Air filter unit)
A filter unit 3 was obtained using the dust collection deodorizing filter medium 3 in the same manner as in Example 1. The unit had a pressure loss of 70 Pa and a particle collection efficiency of 24.7%.

[Example 4]
(Preparation of dust collection deodorizing filter media)
A dust collection deodorizing filter medium 4 was produced in the same manner as in Example 1 except that an ethylene / propylene copolymer and a polypropylene sheet (basis weight 50 g / m ² ) were used as the substrates A and B. The dust collection deodorizing filter medium had a single plate pressure loss of 7.7 Pa and a particle collection efficiency of 53.3%.

(Air filter unit)
A filter unit 4 was obtained in the same manner as in Example 1 using the dust collection deodorizing filter medium 4. The unit had a pressure loss of 90 Pa and a particle collection efficiency of 29.3%.

[Example 5]
(Preparation of dust collection deodorizing filter media)
A dust collection deodorizing filter medium 5 was produced in the same manner as in Example 1 except that a polyethylene terephthalate / polyethylene thermal bond nonwoven fabric sheet (basis weight 50 g / m ² ) was used as the substrate B. The dust collection deodorizing filter medium had a single plate pressure loss of 9.8 Pa and a particle collection efficiency of 59.3%.

(Air filter unit)
A filter unit 5 was obtained in the same manner as in Example 1 using the dust collection deodorizing filter medium 5. The unit had a pressure loss of 103 Pa and a particle collection efficiency of 30.1%.

[Example 6]
(Preparation of dust collection deodorizing filter media)
The dust collection deodorizing filter medium 1 was charged by a corona discharge device to obtain a dust collection deodorization filter medium 6. The dust collection deodorizing filter medium had a single plate pressure loss of 7.9 Pa and a particle collection efficiency of 64.3%.

(Air filter unit)
A filter unit 6 was obtained in the same manner as in Example 1 using the dust collection deodorizing filter medium 6. The unit had a pressure loss of 80 Pa and a particle collection efficiency of 37.3%.

[Comparative Example 1]
(Preparation of dust collection deodorizing filter media)
As the substrate A, an ethylene / propylene copolymer and a polypropylene sheet (basis weight 15 g / m ² ) and a polypropylene spunbond nonwoven fabric sheet (basis weight 30 g / m ² ) as the substrate B were used. Similarly, a dust collection deodorizing filter medium 11 was produced. The dust collection deodorizing filter medium had a single plate pressure loss of 3.7 Pa and a particle collection efficiency of 26.2%.

(Air filter unit)
A filter unit 11 was obtained in the same manner as in Example 1 using the dust collection deodorizing filter medium 11. The unit had a pressure loss of 32 Pa and a particle collection efficiency of 17.2%.

[Comparative Example 2]
(Preparation of dust collection deodorizing filter media)
A dust collection deodorizing filter medium 12 was produced in the same manner as in Example 1 except that an ethylene / propylene copolymer and a polypropylene sheet (basis weight 150 g / m ² ) were used as the substrate A. The dust collection deodorizing filter medium had a single plate pressure loss of 13.5 Pa and a particle particle collection efficiency of 71.0%.

(Air filter unit)
A filter unit 12 was obtained in the same manner as in Example 1 using the dust collection deodorizing filter medium 12. The unit had a pressure loss of 154 Pa and a particle collection efficiency of 35.5%.

[Comparative Example 3]
(Preparation of dust collection deodorizing filter media)
A dust collection deodorizing filter medium 13 was produced in the same manner as in Example 1 except that polypropylene spunbond nonwoven fabric sheets (basis weight 55 g / m ² ) were used as the base materials A and B. The dust collection deodorizing filter medium had a single plate pressure loss of 5.9 Pa and a particle particle collection efficiency of 18.5%.

(Air filter unit)
A filter unit 13 was obtained in the same manner as in Example 1 using the dust collection deodorizing filter medium 13. The unit had a pressure loss of 27 Pa and a particle collection efficiency of 13.0%.

[Comparative Example 4]
(Preparation of dust collection deodorizing filter media)
A dust collection deodorizing filter medium 14 was produced in the same manner as in Example 1 except that a polyethylene terephthalate / polyethylene thermal bond nonwoven fabric sheet (basis weight 50 g / m ² ) was used as the substrates A and B. The dust collection deodorizing filter medium had a single plate pressure loss of 3.8 Pa and a particle collection efficiency of 24.8%.

(Air filter unit)
A filter unit 14 was obtained in the same manner as in Example 1 using the dust collection deodorizing filter medium 14. The pressure loss of the unit was 30 Pa, and the particle collection efficiency was 15.9%.

[Comparative Example 5]
(Preparation of dust collection deodorizing filter media)
A dust collection deodorizing filter medium 15 was produced in the same manner as in Example 1 except that an ethylene / propylene copolymer and a polypropylene sheet (basis weight 95 g / m ² ) were used as the bases A and B. The dust collection deodorizing filter medium had a single plate pressure loss of 15.2 Pa and a particle collection efficiency of 66.0%.

(Air filter unit)
A filter unit 15 was obtained in the same manner as in Example 1 using the dust collection deodorizing filter medium 15. The unit had a pressure loss of 171 Pa and a particle collection efficiency of 43.0%.

[Comparative Example 6]
(Preparation of dust collection deodorizing filter media)
Example 1 except that a polypropylene meltblown nonwoven fabric sheet (basis weight 20 g / m ² ) was used as the substrate A, and a polypropylene spunbond nonwoven fabric sheet (basis weight 40 g / m ² ) was used as the substrate B. Similarly, a dust collection deodorizing filter medium 16 was produced. The single plate pressure loss of the dust collection deodorizing filter medium was 23.0 Pa, and the particle collection efficiency was 94.0%.

(Air filter unit)
A filter unit 16 was obtained in the same manner as in Example 1 using the dust collection deodorizing filter medium 16. The unit had a pressure loss of 99 Pa and a particle collection efficiency of 94.9%.

[Comparative Example 7]
(Preparation of dust collection deodorizing filter media)
A dust collection deodorizing filter medium 17 was produced in the same manner as in Example 1 except that a polypropylene spunbond nonwoven fabric sheet (basis weight 80 g / m ² ) was used as the base materials A and B. The single plate pressure loss of the dust collection deodorizing filter medium was 13.9 Pa, and the particle collection efficiency was 23.2%.

(Air filter unit)
A filter unit 17 was obtained in the same manner as in Example 1 using the dust collection deodorizing filter medium 17. The unit had a pressure loss of 46 Pa and a particle collection efficiency of 13.9%.

  The evaluation results obtained in Examples 1 to 6 and Comparative Examples 1 to 7 are shown in Table 1.

Examples 1 to 6 are dust collecting deodorizing filter media using a sheet of ethylene / propylene copolymer and polypropylene having a basis weight of 20 to 100 g / m ² as the base material A and / or B, and the single plate pressure loss of the filter media Is 10.0 Pa or less, and the collection efficiency of particles of 0.3 μm or more is 30% or more, which is a good performance as a filter unit using the filter medium. On the other hand, Comparative Example 1 is a dust collection deodorizing filter medium using a base material A sheet of ethylene / propylene copolymer having a basis weight of less than 20 g / m ² and polypropylene, and the single plate pressure loss of the filter medium is good at 10.0 Pa or less. However, the particle collection efficiency is 26.2%, which is inferior in performance to the filter medium of the example. Comparative Example 2 is a dust collection deodorizing filter medium using a sheet of ethylene / propylene copolymer having a basis weight of 150 g / m ² and polypropylene as the base material A, and the particle collection efficiency is good at 71.0%. The single plate pressure loss of the filter medium is more than 10.0 Pa, which is inferior to the filter medium of the example. Moreover, the filter unit using the filter medium of Comparative Examples 1 and 2 is insufficient as required performance.

On the other hand, Comparative Examples 3, 4 and 7 are a dust collection deodorizing filter medium using a sheet which is not a sheet of ethylene / propylene copolymer and polypropylene having a basis weight of 20 to 100 g / m ² for both of the base materials A and B. It is. Among these, in Comparative Examples 3 and 4, the single plate pressure loss of the filter medium is 10.0 Pa or less, respectively, but the particle collection efficiency is 30% or less, and the particle collection efficiency of the filter unit using the filter medium is also low. Therefore, the required performance is insufficient. In Comparative Example 7, the single plate pressure loss of the filter medium is 10.0 Pa or more and the particle collection efficiency is 30% or less, and the performance as a filter unit using the filter medium is insufficient.

Comparative Example 5 is a dust collection deodorizing filter medium using a sheet of ethylene / propylene copolymer and polypropylene having a basis weight of 95 g / m ² for both of the substrates A and B, but as a filter medium single plate and a filter unit. The pressure loss is high, and the required performance is insufficient.

  Comparative Example 6 is a dust collection deodorizing filter medium using a polypropylene melt-blown nonwoven sheet as the base material A, and the particle collection efficiency is good, but the pressure loss of the filter medium single plate exceeds 10.0 Pa, and the filter medium is used. As a filter unit, the pressure loss is high, and the required performance is insufficient.

  Comparing the example and the comparative example, it was shown that the example is a dust collection deodorization filter medium and a dust collection deodorization filter with improved dust collection performance while keeping the pressure loss low.

  INDUSTRIAL APPLICABILITY The present invention can be used for a filter attached to home appliances such as an air conditioner and an air cleaner, an air conditioner such as a building, a business office, and an automobile.

Claims (3)

In a dust collection deodorizing filter medium in which an adsorbent is sealed between a base material A and a base material B, at least one of the base material A and the base material B is ethylene propylene having a basis weight of 20 to 200 g / m ^2. It is a thermal bond nonwoven fabric sheet containing copolymer fibers and polypropylene fibers, and the collection efficiency of particles of 0.3 μm or more is 30% or more at a surface wind speed of 5.3 cm / sec in the dust collection deodorizing filter medium A dust collection deodorizing filter medium characterized by having a pressure loss of 10.0 Pa or less.   The dust collection deodorizing filter medium according to claim 1, wherein the thermal bond nonwoven fabric sheet containing ethylene / propylene copolymer fiber and polypropylene fiber is a sheet subjected to electrification processing.   A dust collection deodorization filter using the dust collection deodorization filter medium according to claim 1.