WO2022065516A1 - エアフィルタ濾材、フィルタプリーツパック及びエアフィルタユニット - Google Patents

エアフィルタ濾材、フィルタプリーツパック及びエアフィルタユニット Download PDF

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Publication number
WO2022065516A1
WO2022065516A1 PCT/JP2021/035723 JP2021035723W WO2022065516A1 WO 2022065516 A1 WO2022065516 A1 WO 2022065516A1 JP 2021035723 W JP2021035723 W JP 2021035723W WO 2022065516 A1 WO2022065516 A1 WO 2022065516A1
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Prior art keywords
filter medium
filter
air filter
air
layer
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PCT/JP2021/035723
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English (en)
French (fr)
Japanese (ja)
Inventor
剛 佐藤
将明 森
俊輔 正木
優介 池村
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Nitto Denko Corp
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Nitto Denko Corp
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Priority to DE112021005099.0T priority Critical patent/DE112021005099T5/de
Priority to CN202180066228.9A priority patent/CN116234621A/zh
Priority to US18/027,455 priority patent/US12440794B2/en
Priority to JP2022552118A priority patent/JPWO2022065516A1/ja
Publication of WO2022065516A1 publication Critical patent/WO2022065516A1/ja
Anticipated expiration legal-status Critical
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/54—Particle separators, e.g. dust precipitators, using ultra-fine filter sheets or diaphragms
    • B01D46/543—Particle separators, e.g. dust precipitators, using ultra-fine filter sheets or diaphragms using membranes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
    • B01D39/1607—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous
    • B01D39/1623—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous of synthetic origin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
    • B01D39/1692—Other shaped material, e.g. perforated or porous sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • B01D39/20—Other self-supporting filtering material ; Other filtering material of inorganic material, e.g. asbestos paper, metallic filtering material of non-woven wires
    • B01D39/2003—Glass or glassy material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • B01D39/20—Other self-supporting filtering material ; Other filtering material of inorganic material, e.g. asbestos paper, metallic filtering material of non-woven wires
    • B01D39/2003—Glass or glassy material
    • B01D39/2017—Glass or glassy material the material being filamentary or fibrous
    • B01D39/2024—Glass or glassy material the material being filamentary or fibrous otherwise bonded, e.g. by resins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • B01D39/20—Other self-supporting filtering material ; Other filtering material of inorganic material, e.g. asbestos paper, metallic filtering material of non-woven wires
    • B01D39/2027—Metallic material
    • B01D39/2041—Metallic material the material being filamentary or fibrous
    • B01D39/2048—Metallic material the material being filamentary or fibrous otherwise bonded
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/52—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material
    • B01D46/521—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material using folded, pleated material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
    • B01D71/06—Organic material
    • B01D71/30—Polyalkenyl halides
    • B01D71/32—Polyalkenyl halides containing fluorine atoms
    • B01D71/36—Polytetrafluoroethylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/02—Types of fibres, filaments or particles, self-supporting or supported materials
    • B01D2239/0216—Bicomponent or multicomponent fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/06—Filter cloth, e.g. knitted, woven non-woven; self-supported material
    • B01D2239/0604—Arrangement of the fibres in the filtering material
    • B01D2239/0627—Spun-bonded
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/06—Filter cloth, e.g. knitted, woven non-woven; self-supported material
    • B01D2239/065—More than one layer present in the filtering material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/06—Filter cloth, e.g. knitted, woven non-woven; self-supported material
    • B01D2239/065—More than one layer present in the filtering material
    • B01D2239/0654—Support layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/06—Filter cloth, e.g. knitted, woven non-woven; self-supported material
    • B01D2239/065—More than one layer present in the filtering material
    • B01D2239/0668—The layers being joined by heat or melt-bonding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/06—Filter cloth, e.g. knitted, woven non-woven; self-supported material
    • B01D2239/065—More than one layer present in the filtering material
    • B01D2239/0681—The layers being joined by gluing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/12—Special parameters characterising the filtering material
    • B01D2239/1233—Fibre diameter
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/12—Special parameters characterising the filtering material
    • B01D2239/1258—Permeability
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/12—Special parameters characterising the filtering material
    • B01D2239/1291—Other parameters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2275/00—Filter media structures for filters specially adapted for separating dispersed particles from gases or vapours
    • B01D2275/10—Multiple layers
    • B01D2275/105—Wound layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/0001—Making filtering elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/0027—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/10—Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces
    • B01D46/12—Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces in multiple arrangements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/52—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material
    • B01D46/521—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material using folded, pleated material
    • B01D46/523—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material using folded, pleated material with means for maintaining spacing between the pleats or folds

Definitions

  • the present invention relates to an air filter filter medium provided with a fluororesin porous membrane, and a filter pleated pack and an air filter unit provided with the filter medium.
  • the fluororesin porous membrane has innumerable fine pores and is excellent in the ability to collect particles such as dust, so that it is used in various air filter filter media.
  • the fluororesin porous membrane usually functions as a surface collection filter that collects the object to be collected on the surface layer portion. Therefore, when an air filter filter medium provided with a fluororesin porous membrane is used for collecting particles in the atmosphere such as an outside air treatment filter and a turbine intake filter, the pressure loss tends to increase due to clogging.
  • a pre-filter is arranged on the upstream side of the air flow passing through the fluororesin porous membrane.
  • Patent Document 1 discloses an example of an air filter filter medium including a polytetrafluoroethylene (hereinafter referred to as PTFE) porous membrane, which is a kind of fluororesin porous membrane, and a prefilter.
  • PTFE polytetrafluoroethylene
  • the atmosphere may contain not only solid particles such as dust and salt particles, but also non-volatile liquid particles such as oil mist (hereinafter, simply referred to as "liquid particles"). According to the studies by the present inventors, it has been found that the pressure loss increases in a short period of time even in the air filter filter medium provided with the pre-filter in the environment containing the liquid particles. Patent Document 1 does not consider this point at all.
  • An object of the present invention is to provide an air filter filter medium provided with a fluororesin porous membrane, which is suitable for suppressing an increase in pressure loss even in an environment containing liquid particles such as oil mist.
  • the present invention An air filter filter medium provided with a fluororesin porous membrane. Further equipped with a glass filter medium layer, The glass filter medium layer and the fluororesin porous membrane are arranged in this order from upstream to downstream of the air flow passing through the air filter filter medium.
  • the invention is: A filter pleated pack consisting of an air filter filter medium folded into a pleated shape.
  • the air filter filter medium is the filter pleated pack, which is the air filter filter medium of the present invention. I will provide a.
  • the present invention An air filter unit equipped with an air filter filter medium.
  • the air filter unit wherein the air filter filter medium is the air filter filter medium of the present invention. I will provide a.
  • the invention is: An air filter unit equipped with a filter pleated pack.
  • the air filter unit, wherein the filter pleated pack is the filter pleated pack of the present invention. I will provide a.
  • an air filter filter medium provided with a fluororesin porous membrane which is suitable for suppressing an increase in pressure loss even in an environment containing liquid particles such as oil mist, is achieved.
  • FIG. 1 is a cross-sectional view schematically showing an example of the air filter filter medium of the present invention.
  • FIG. 2 is a cross-sectional view schematically showing another example of the air filter filter medium of the present invention.
  • FIG. 3 is a cross-sectional view schematically showing another example of the air filter filter medium of the present invention.
  • FIG. 4 is a cross-sectional view schematically showing still another example of the air filter filter medium of the present invention.
  • FIG. 5 is a cross-sectional view schematically showing another example of the air filter filter medium of the present invention, which is different from the above.
  • FIG. 6 is a perspective view schematically showing an example of the filter pleated pack of the present invention.
  • FIG. 7 is a perspective view schematically showing an example of the air filter unit of the present invention.
  • FIG. 1 shows an example of the air filter filter medium of the present embodiment.
  • the air filter filter medium 1 in FIG. 1 is a filter medium provided with a fluororesin porous membrane 2.
  • the air filter filter medium 1 further includes a glass filter medium layer 3.
  • the glass filter medium layer 3 and the fluororesin porous film 2 are arranged in this order from the upstream to the downstream of the air flow 11 passing through the air filter filter medium 1.
  • the glass filter medium layer 3 is arranged on the upstream side of the air flow 11 with respect to the fluororesin porous film 2.
  • the air filter filter medium 1 of FIG. 1 includes one glass filter medium layer 3 and a fluororesin porous film 2, respectively.
  • the C / Si ratio evaluated by fluorescent X-ray analysis (hereinafter referred to as XRF) is 0.020 or more.
  • XRF fluorescent X-ray analysis
  • the affinity of the surface 12 for liquid particles, which are typically organic substances such as oil mist is improved. Therefore, it is considered that the liquid particles collected in the glass filter medium layer 3 tend to stay in the vicinity of the surface of the glass filter medium layer 3.
  • the C / Si ratio may be 0.022 or more, 0.023 or more, 0.025 or more, and even 0.027 or more.
  • the upper limit of the C / Si ratio is, for example, 0.050 or less, and may be 0.040 or less, 0.038 or less, 0.035 or less, 0.033 or less, and further 0.030 or less.
  • the C / Si ratio can be evaluated by a fluorescent X-ray analyzer (for example, a scanning fluorescent X-ray analyzer ZSX Primus series manufactured by Rigaku).
  • the Si (silicon) present on the surface 12 is mainly derived from the glass contained in the glass filter medium layer 3.
  • the C (carbon) present on the surface 12 is derived from, for example, a binder that can be contained in the glass filter medium layer 3.
  • the glass filter medium layer 3 made of a fiber material containing glass fibers usually contains a binder for binding the fibers to each other.
  • the glass filter medium layer 3 can function as a pre-filter for collecting a part of the object to be collected contained in the air flow 11.
  • the objects to be collected include liquid particles such as oil mist.
  • the glass filter medium layer 3 usually functions as a volumetric collection filter that collects an object to be collected inside the layer.
  • the glass filter medium layer 3 is typically composed of a fiber material containing glass fibers.
  • the glass filter medium layer 3 may be made of glass fiber.
  • the average fiber diameter of the glass fiber may be 0.5 to 2.0 ⁇ m.
  • the smaller the average fiber diameter the better the collection performance of the glass filter medium layer 3.
  • the average fiber diameter of the fiber material is defined as the average value of the diameters of at least 20 fibers randomly selected on the magnified observation image of the surface and / or the cross section of the layer composed of the fiber material.
  • the magnified observation image is, for example, a microscope image of a scanning electron microscope (SEM), a laser microscope, or the like.
  • the magnification of the magnified observation image is, for example, about 100 to 500 times.
  • the diameter of each selected fiber can be obtained, for example, by image analysis as the fiber width in the direction perpendicular to the extending direction of the fiber.
  • the average fiber diameter may be substantially uniform in the thickness direction of the glass filter medium layer 3. In the present specification, even if there is a difference of 20% or less, preferably 10% or less, it is considered that the average fiber diameter is substantially uniform. The above difference is caused by the formula: (D max ⁇ D min ) / D min , where the smallest average fiber diameter is D min and the largest average fiber diameter is D max among the plurality of average fiber diameters D to be compared. ).
  • the glass filter medium layer 3 may contain a material other than those described above.
  • An example of the material is a binder that binds fibers to each other in a glass filter medium layer 3 made of a fiber material.
  • the binder is typically a resin. Examples of resins are acrylic resins, polyvinyl alcohol resins and polyethylene oxide resins.
  • the thickness of the glass filter medium layer 3 is, for example, 100 to 500 ⁇ m, 200 to 450 ⁇ m, and may be 250 to 400 ⁇ m.
  • the basis weight (weight) of the glass filter medium layer 3 is, for example, 20 to 100 g / m 2 , 30 to 90 g / m 2 , and further 40 to 80 g / m 2 .
  • the initial pressure loss PD 0 at a permeation flow rate of 5.3 cm / sec of the glass filter medium layer 3 is, for example, 15 to 175 Pa, and may be 30 to 110 Pa.
  • the pressure loss PD of each layer constituting the air filter filter medium 1 and the air filter filter medium 1 can be evaluated as follows.
  • the filter medium or layer to be evaluated is set in a circular holder having an effective area of 100 cm 2 . Air is permeated through the set evaluation object, and the pressure loss when the linear velocity of the passing air is adjusted to 5.3 cm / sec with a flow meter is measured with a pressure gauge (manometer).
  • a pressure gauge manometer
  • air is flowed from the glass filter medium layer 3 toward the fluororesin porous membrane 2.
  • the pressure loss is measured eight times for one evaluation object, and the average thereof is defined as the pressure loss PD.
  • the glass filter medium layer 3 is evaluated using polyalphaolefin (PAO) particles (hereinafter referred to as polydisperse PAO particles) which are polydisperse particles having a number peak in the particle size range of 0.1 to 0.2 ⁇ m.
  • PAO polyalphaolefin
  • the collection efficiency CE measured under the conditions of a particle size of 0.3 to 0.5 ⁇ m and a permeation flow rate of 5.3 cm / sec is, for example, 60 to 95%, and may be 40 to 99%.
  • the glass filter medium layer 3 can usually have higher collection performance than a prefilter made of a non-woven fabric of resin fibers.
  • the collection efficiency CE of each layer constituting the air filter filter medium 1 and the air filter filter medium 1 can be evaluated as follows.
  • the filter medium or layer to be evaluated is set in a circular holder having an effective area of 100 cm 2 . Air is permeated through the set evaluation object, and the linear velocity of the passing air is adjusted to 5.3 cm / sec with a flow meter.
  • air is flowed from the glass filter medium layer 3 toward the fluororesin porous membrane 2.
  • the polydisperse PAO particles are included in the air passing through the evaluation object so that the concentration of the particles having a particle size of 0.1 to 0.2 ⁇ m is 4 ⁇ 10 8 particles / L or more.
  • Polydisperse PAO particles can be generated using, for example, a constant power aerosol atomizer. After that, using a particle counter placed downstream of the holder, the concentration of polydisperse PAO particles contained in the air that passed through the evaluation target was determined for the range of the evaluation target particle size, and the evaluation target was calculated by the following formula (1). Calculate the collection efficiency CE of the object.
  • the particle concentration of the formula (1) is the concentration of particles in the range of the particle size to be evaluated on both the upstream side and the downstream side.
  • the PF (Performance Factor) value obtained by the following formula (2) is, for example, 3 to 15, 5 to 12, and may be 10 to 12.
  • the PF value of the glass filter medium layer 3 composed of the fiber material containing the glass fiber can be 10 or more.
  • the PD of the formula (2) is the initial pressure loss, and the CE is the collection efficiency.
  • the unit of the pressure loss PD in the formula (2) is mmH 2 O.
  • PF value ⁇ -l Albanyg [(100-CE) / 100] / PD ⁇ x 100 (2)
  • the glass filter medium layer 3 in FIG. 1 is a single layer.
  • the glass filter medium layer 3 may be a laminate of two or more identical or different layers.
  • the surface 12 on the upstream side of the glass filter medium layer 3 constitutes one exposed surface of the filter medium 1.
  • the exposed surface is a surface on which the airflow 11 flows into the filter medium 1.
  • a further layer may be arranged on the upstream side of the air flow 11 with respect to the glass filter medium layer 3.
  • the glass filter medium layer 3 and the fluororesin porous film 2 are in contact with each other.
  • Another layer may be arranged between the glass filter medium layer 3 and the fluororesin porous film 2.
  • the generation of static electricity during the production and use of the air filter filter medium 1 is suppressed as compared with the case where a prefilter made of a non-woven fabric of resin fibers is used. Therefore, even when the glass filter medium layer 3 and the fluororesin porous film 2 are in contact with each other, damage to the fluororesin porous film 2 due to static electricity can be suppressed.
  • the fluororesin porous membrane 2 can function as the main filter of the air filter filter medium 1.
  • the fluororesin porous film 2 usually functions as a surface collecting filter that collects the object to be collected on the surface layer portion.
  • the fluororesin porous membrane 2 is typically composed of innumerable fluororesin fibrils, which are fine fibrous structures.
  • the fluororesin porous membrane may have a fluororesin node (nodule) connected to the fibril.
  • the fluororesin porous membrane 2 is mainly composed of fluororesin. "Mainly composed of fluororesin” means that the content of fluororesin is the largest among all the components contained in the fluororesin porous membrane 2.
  • the content of the fluororesin in the fluororesin porous membrane 2 is, for example, 50% by weight or more, 60% by weight or more, 70% by weight or more, 80% by weight or more, 90% by weight or more, and further 95% by weight or more. You may.
  • the fluororesin porous membrane 2 may contain, for example, a filler in addition to the fluororesin.
  • fluororesins examples include PTFE, ethylene-tetrafluoroethylene-hexafluoropropylene copolymer (EFEP), tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride copolymer (THV), and tetrafluoroethylene-hexafluoropropylene.
  • FEP ethylene-tetrafluoroethylene-hexafluoropropylene copolymer
  • TSV tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride copolymer
  • ETFE ethylene-tetrafluoroethylene copolymer
  • the fluororesin porous membrane 2 may contain two or more types of fluororesins.
  • the fluororesin porous membrane 2 may be a PTFE porous membrane.
  • the fluororesin porous film 2 is formed by, for example, forming a mixture of an unfired fluororesin powder and a liquid lubricant into a film by a method such as extrusion and / or rolling, and the liquid lubricant is obtained from the obtained unfired film. Can be formed by stretching the resin after removing the resin. After forming the unfired film, firing may be performed by heating the film to a temperature equal to or higher than the melting point of the fluororesin at an arbitrary timing.
  • liquid lubricants are hydrocarbon oils such as naphtha, white oil and liquid paraffin. However, the liquid lubricant is not limited as long as it can wet the surface of the fluororesin powder and can be removed later.
  • stretching examples include stretching of an unfired film at a stretching ratio of 2 to 60 times with respect to MD (longitudinal direction) and a stretching temperature of 150 to 390 ° C., and stretching ratio of the film with respect to TD (width direction) of 10 to 60 times and stretching temperature. It is a biaxial stretching in combination with stretching at 40 to 150 ° C.
  • the method for producing the fluororesin porous membrane 2 is not limited as long as the collection performance according to the intended use of the air filter filter medium 1 can be obtained.
  • the thickness of the fluororesin porous membrane 2 is, for example, 1 to 100 ⁇ m, 2 to 50 ⁇ m, and further may be 3 to 20 ⁇ m.
  • the basis weight of the fluororesin porous membrane 2 is, for example, 0.05 to 10 g / m 2 , 0.1 to 5 g / m 2 , and further may be 0.3 to 3 g / m 2 .
  • the average fiber diameter (average fiber diameter of fibril) of the fluororesin porous film 2 is, for example, 0.2 ⁇ m or less, 0.15 ⁇ m or less, and may be 0.1 ⁇ m or less.
  • the lower limit of the average fiber diameter is, for example, 0.05 ⁇ m or more, and may be 0.08 ⁇ m or more.
  • the collection performance of the fluororesin porous membrane 2 usually increases as the average fiber diameter becomes smaller.
  • the collection performance can be expressed by the PF value, and the larger the PF value, the higher the collection performance.
  • the initial pressure loss PD 0 at a permeation flow rate of 5.3 cm / sec of the fluororesin porous membrane 2 is, for example, 10 to 200 Pa, 20 to 150 Pa, and may be 30 to 100 Pa.
  • the collection efficiency CE measured for the fluororesin porous film 2 using polydisperse PAO particles under the conditions of an evaluation target particle size of 0.1 to 0.2 ⁇ m and a permeation flow velocity of 5.3 cm / sec is, for example, 50 to 99. It is 9.9%, 60 to 99%, and may be 70 to 98%.
  • the PF value obtained by the above formula (2) is, for example, 20 or more, and may be 22 or more, 23 or more, 25 or more, 27 or more, 28 or more, or even 30 or more. ..
  • the upper limit of the PF value is, for example, 40 or less, and may be 38 or less, 36 or less, and further 35 or less.
  • the fluororesin porous membrane 2 having an average fiber diameter of 0.05 ⁇ m or more and 0.1 ⁇ m or less can have a PF value of 25 to 40.
  • the fluororesin porous membrane 2 having an average fiber diameter of more than 0.1 ⁇ m and 0.2 ⁇ m or less can have a PF value of 20 to 25.
  • the fluororesin porous membrane 2 in FIG. 1 is a single layer.
  • the fluororesin porous film 2 may be a laminate of two or more identical or different films.
  • the air filter filter medium 1 of FIG. 1 includes one fluororesin porous membrane 2. However, the air filter filter medium 1 may include a further fluororesin porous membrane other than the fluororesin porous membrane 2.
  • one outermost layer is a glass filter medium layer 3, and the other outermost layer is a fluororesin porous membrane 2.
  • the air filter filter medium of the present invention may be provided with additional layers and / or members as long as the effects of the present invention can be obtained.
  • FIG. 2 shows an example of the air filter filter medium 1 having a further layer.
  • the air filter filter medium 1 of FIG. 2 further includes a first breathable support layer 5.
  • the breathable support layer 5 is arranged between the glass filter medium layer 3 and the fluororesin porous membrane 2.
  • the glass filter medium layer 3, the breathable support layer 5, and the fluororesin porous membrane 2 are arranged in this order from the upstream to the downstream of the air flow 11 passing through the air filter filter medium 1.
  • the glass filter medium layer 3 and the breathable support layer 5 are arranged on the upstream side of the air flow 11 with respect to the fluororesin porous membrane 2 in this order from the upstream side.
  • the air filter filter medium 1 of FIG. 2 includes one glass filter medium layer 3, a breathable support layer 5, and a fluororesin porous film 2, respectively.
  • the first breathable support layer 5 can function as a layer that supports the fluororesin porous film 2 from the upstream side of the air flow 11. Further, the first breathable support layer 5 can function as a layer that inhibits the movement of the liquid particles once collected in the glass filter medium layer 3 to the fluororesin porous membrane 2.
  • the breathable support layer 5 is made of, for example, a fiber material.
  • the average fiber diameter of the fiber material that can form the breathable support layer 5 may be larger than the average fiber diameter of the fiber material that can form the glass filter medium layer 3.
  • the function as a pre-filter that collects a part of the object to be collected contained in the air flow 11 may be lower than that of the glass filter medium layer 3.
  • the average fiber diameter of the fiber material that can form the breathable support layer 5 may be more than 5 ⁇ m, 8 ⁇ m or more, 12 ⁇ m or more, 16 ⁇ m or more, and further 18 ⁇ m or more.
  • the upper limit of the average fiber diameter is, for example, 50 ⁇ m or less, and may be 40 ⁇ m or less, 30 ⁇ m or less, and further 27 ⁇ m or less.
  • the fiber material that can form the breathable support layer 5 includes, for example, at least one fiber selected from glass fiber, resin fiber, and metal fiber.
  • resin fibers include polyolefin fibers such as polyethylene (PE) fibers and polypropylene (PP) fibers, polyester fibers such as polyethylene terephthalate (PET) fibers and polyethylene naphthalate fibers, acrylic fibers such as acrylonitrile fibers, and aromatic polyamide fibers. It is a polyamide fiber containing.
  • the resin fiber may be a composite fiber of two or more resins.
  • An example of a composite fiber is a fiber having a core-sheath structure including a core portion and a sheath portion covering the core portion.
  • the melting point of the sheath may be lower than the melting point of the core.
  • a specific example of the composite fiber is a fiber composed of a core portion of PET and a sheath portion of PE. In this case, since the adhesiveness of PE to the fluororesin porous membrane 2 is excellent, the bonding between the breathable support layer 5 and the fluororesin porous membrane 2 becomes more reliable.
  • the breathable support layer 5 may be a non-woven fabric of resin fibers.
  • An example of a non-woven fabric is a spunbonded non-woven fabric.
  • the breathable support layer 5 may contain a material other than those described above.
  • An example of such a material is a binder that binds fibers to each other in a breathable support layer 5 made of a fiber material.
  • the example of the binder is the same as the example of the binder that the glass filter medium layer 3 may contain.
  • the thickness of the breathable support layer 5 is, for example, 100 to 550 ⁇ m, 150 to 450 ⁇ m, and may be 200 to 350 ⁇ m.
  • the basis weight of the breathable support layer 5 is, for example, 10 g / m 2 or more, and may be 15 g / m 2 or more, 20 g / m 2 or more, and further 30 g / m 2 or more.
  • the upper limit of the basis weight is, for example, 100 g / m 2 or less, and may be 70 g / m 2 or less.
  • the breathable support layer 5 is usually a layer having higher breathability in the thickness direction than the fluororesin porous membrane 2 and the glass filter medium layer 3.
  • the initial pressure loss PD 0 of the breathable support layer 5 at a permeation flow rate of 5.3 cm / sec is, for example, 1 to 60 Pa, 2 to 20 Pa, 2 to 10 Pa, and further may be 2 to 4 Pa.
  • the collection efficiency CE measured for the breathable support layer 5 using polydisperse PAO particles under the conditions of a particle size to be evaluated of 0.3 to 0.5 ⁇ m and a permeation flow velocity of 5.3 cm / sec is, for example, 20% or less. Yes, it may be 10% or less.
  • the lower limit of the collection efficiency CE is, for example, 1% or more, and may be 5% or more.
  • the breathable support layer 5 in FIG. 2 is a single layer.
  • the breathable support layer 5 may be a laminate of two or more identical or different layers.
  • the breathable support layer 5 in FIG. 2 is in contact with the glass filter medium layer 3 and the fluororesin porous membrane 2. Another layer may be arranged between the breathable support layer 5 and the glass filter medium layer 3. Another layer may be arranged between the breathable support layer 5 and the fluororesin porous membrane 2.
  • one outermost layer is a glass filter medium layer 3, and the other outermost layer is a fluororesin porous membrane 2.
  • FIG. 3 shows another example of the air filter filter medium 1 provided with a further layer.
  • the air filter filter medium 1 of FIG. 3 has the same configuration as the air filter filter medium 1 of FIG. 2 except that it further includes a second breathable support layer 6.
  • the breathable support layer 6 is arranged on the downstream side of the air flow 11 with respect to the fluororesin porous membrane 2.
  • the breathable support layer 6 sandwiches the fluororesin porous film 2 together with the breathable support layer 5.
  • the air filter filter medium 1 of FIG. 3 includes one glass filter medium layer 3, a breathable support layer 5, a fluororesin porous membrane 2, and a breathable support layer 6, respectively.
  • the second breathable support layer 6 can function as a layer that supports the fluororesin porous film 2 from the downstream side of the air flow 11.
  • the breathable support layer 6 is usually a layer having higher breathability in the thickness direction than the fluororesin porous membrane 2 and the glass filter medium layer 3.
  • the breathable support layer 6 is made of, for example, a fiber material.
  • the breathable support layer 6 is not limited to a layer made of a fiber material as long as it can support the fluororesin porous membrane 2.
  • the breathable support layer 6 may have the above-mentioned configurations and / or characteristics in any combination in the description of the breathable support layer 5.
  • the breathable support layer 6 may be the same as the breathable support layer 5.
  • the breathable support layer 6 in FIG. 3 is in contact with the fluororesin porous membrane 2.
  • Another layer may be arranged between the breathable support layer 6 and the fluororesin porous membrane 2.
  • the initial pressure loss PD 0 as the air filter filter medium 1 can be reduced.
  • one outermost layer is a glass filter medium layer 3, and the other outermost layer is a breathable support layer 6.
  • FIG. 4 shows another example of the air filter filter medium 1 provided with a further layer.
  • the air filter filter medium 1 of FIG. 4 has the same configuration as the air filter filter medium 1 of FIG. 3 except that the second fluororesin porous membrane 7 and the third breathable support layer 8 are further provided.
  • the fluororesin porous membrane 7 is arranged on the downstream side of the air flow 11 with respect to the fluororesin porous membrane 2 and the breathable support layer 6.
  • the breathable support layer 8 is arranged on the downstream side of the air flow 11 with respect to the fluororesin porous membrane 7.
  • the breathable support layer 6 and the breathable support layer 8 sandwich the fluororesin porous film 7.
  • the air filter filter medium 1 of FIG. 4 includes one glass filter medium layer 3, a breathable support layer 5, a fluororesin porous membrane 2, a breathable support layer 6, a fluororesin porous membrane 7, and a breathable support layer 8, respectively. ..
  • the second fluororesin porous membrane 7 can function as the main filter of the air filter filter medium 1 together with the fluororesin porous membrane 2.
  • the fluororesin porous membrane 7 may have the above-mentioned configurations and / or characteristics in any combination in the description of the fluororesin porous membrane 2.
  • the fluororesin porous membrane 7 may be the same as the fluororesin porous membrane 2.
  • the fluororesin porous membrane 7 may be a membrane having lower air permeability (larger pressure loss PD) and / or higher collection efficiency CE than the fluororesin porous membrane 2.
  • the fluororesin porous membrane 7 of FIG. 4 is in contact with the breathable support layer 6.
  • Another layer may be arranged between the fluororesin porous membrane 7 and the breathable support layer 6.
  • the initial pressure loss PD 0 as the air filter filter medium 1 can be reduced.
  • the third breathable support layer 8 can function as a layer that supports the fluororesin porous film 7 from the downstream side of the air flow 11.
  • the breathable support layer 8 may have the configurations and / or properties described above in the description of the breathable support layer 5 in any combination.
  • the breathable support layer 8 may be the same as the breathable support layer 5 and / or the breathable support layer 6.
  • the breathable support layer 8 in FIG. 4 is in contact with the fluororesin porous membrane 7.
  • Another layer may be arranged between the breathable support layer 8 and the fluororesin porous membrane 7.
  • the initial pressure loss PD 0 as the air filter filter medium 1 can be reduced.
  • one outermost layer is a glass filter medium layer 3, and the other outermost layer is a breathable support layer 8.
  • the glass filter medium layer 3, the fluororesin porous film, and the breathable support layer can be bonded to each other by, for example, thermal laminating or laminating with an adhesive. Since it is possible to suppress an increase in pressure loss at the joint portion, joining by thermal laminating is preferable.
  • the air filter filter medium 1 can be manufactured, for example, by joining the layers constituting the filter medium 1.
  • the fluororesin porous film 2 or the laminate containing the fluororesin porous film 2 and the glass filter medium layer 3 may be bonded by a breathable adhesive layer 4.
  • the air filter filter medium 1 can be manufactured by joining the fluororesin porous film 2 or the laminate containing the fluororesin porous film 2 and the glass filter medium layer 3 with the breathable adhesive layer 4.
  • the manufacturing method of the air filter filter medium 1 is not limited to the above example.
  • the air filter filter medium 1 of FIG. 5 has a breathable adhesive layer 4 between the glass filter medium layer 3 and the fluororesin porous membrane 2, more specifically, between the glass filter medium layer 3 and the breathable support layer 5. It has the same configuration as the air filter filter medium 1 of FIG. 3 except that the air filter filter medium 1 is further provided.
  • the glass filter medium layer 3, the breathable adhesive layer 4, the breathable support layer 5, the fluororesin porous membrane 2 and the breathable support layer 6 are the airflow 11 that passes through the air filter filter medium 1. They are arranged in this order from upstream to downstream. In other words, the glass filter medium layer 3 and the breathable adhesive layer 4 are arranged on the upstream side of the air flow 11 with respect to the fluororesin porous film 2 in this order from the upstream side.
  • the breathable adhesive layer 4 is a layer composed of an adhesive.
  • the breathable adhesive layer 4 can function as a layer for joining the glass filter medium layer 3 and the laminate containing the fluororesin porous film 2. Further, the breathable adhesive layer 4 can function as a layer that inhibits the movement of the liquid particles once collected in the glass filter medium layer 3 to the fluororesin porous film 2.
  • the basis weight of the breathable adhesive layer 4 is, for example, 2 to 30 g / m 2 .
  • the lower limit of the basis weight may be 4 g / m 2 or more, 5.5 g / m 2 or more, 6 g / m 2 or more, 7 g / m 2 or more, and further 8 g / m 2 or more.
  • the upper limit of the basis weight may be 25 g / m 2 or less, 24 g / m 2 or less, 20 g / m 2 or less, 18 g / m 2 or less, and further 16 g / m 2 or less.
  • Examples of the adhesive constituting the breathable adhesive layer 4 are various adhesives of rubber type, acrylic type, silicone type and urethane type.
  • the pressure-sensitive adhesive may be a hot melt type. More specific examples of pressure-sensitive adhesives are styrene / butadiene / styrene elastomer (SBS), styrene / isoprene / styrene elastomer (SIS), ethylene vinyl acetate (EVA), polyolefins and polyamides.
  • SBS styrene / butadiene / styrene elastomer
  • SIS styrene / isoprene / styrene elastomer
  • EVA ethylene vinyl acetate
  • polyamides polyamides.
  • the pressure-sensitive adhesive is not limited to the above example.
  • the breathable adhesive layer 4 may be a layer composed of a fibrous adhesive.
  • the fibrous pressure-sensitive adhesive may be randomly distributed in the in-plane direction and the thickness direction of the layer.
  • the average fiber diameter of the fibrous pressure-sensitive adhesive is, for example, 10 to 30 ⁇ m, may be 15 to 28 ⁇ m, and may be 20 to 25 ⁇ m.
  • the breathable pressure-sensitive adhesive layer 4 composed of the fibrous pressure-sensitive adhesive can be formed, for example, by spraying and coating the layer in contact with the breathable pressure-sensitive adhesive layer 4 in the air filter filter medium 1.
  • the breathable adhesive layer 4 formed on the transfer film by spray coating or the like may be transferred to the contact layer to form the breathable adhesive layer 4.
  • the thickness of the breathable adhesive layer 4 is, for example, 5.5 to 16 ⁇ m, 6 to 14 ⁇ m, and may be 7 to 12 ⁇ m.
  • the breathable adhesive layer 4 in FIG. 5 is a single layer.
  • the breathable adhesive layer 4 may be a laminate of two or more identical or different layers.
  • the breathable adhesive layer 4 in FIG. 5 is in contact with the glass filter medium layer 3 and the breathable support layer 5. Another layer may be arranged between the breathable adhesive layer 4 and the glass filter medium layer 3. Another layer may be arranged between the breathable adhesive layer 4 and the breathable support layer 5.
  • the thickness of the air filter filter medium 1 is, for example, 200 to 1000 ⁇ m, 300 to 900 ⁇ m, and further 400 to 800 ⁇ m.
  • the basis weight of the air filter filter medium 1 is, for example, 60 to 200 g / m 2 , 80 to 180 g / m 2 , and further 100 to 160 g / m 2 .
  • the initial pressure loss PD 0 at a permeation flow rate of 5.3 cm / sec of the air filter filter medium 1 is, for example, 50 to 300 Pa, 70 to 250 Pa, and may be 100 to 200 Pa.
  • the initial pressure loss PD 0 of the air filter filter medium 1 is usually lower than that of the glass fiber filter medium having the same collection efficiency CE.
  • the collection efficiency CE measured for the air filter filter medium 1 using polydisperse PAO particles under the conditions of an evaluation target particle size of 0.1 to 0.2 ⁇ m and a permeation flow velocity of 5.3 cm / sec is, for example, 85% or more. , 90% or more, 95% or more, 97% or more, 98% or more, 99% or more, and further 99.5% or more.
  • the upper limit of the collection efficiency CE is, for example, 99.99% or less, and may be 99.9% or less.
  • the PF value obtained by the above formula (2) is, for example, 20 or more, and may be 22 or more, 23 or more, 25 or more, 27 or more, 28 or more, or even 30 or more.
  • the upper limit of the PF value is, for example, 40 or less, and may be 38 or less, 36 or less, and further 35 or less.
  • PAO holding amount the amount of PAO particles collected by the air filter filter medium 1 (hereinafter referred to as “PAO holding amount”) is, for example, 50 g / m 2 or more, and 60 g / m. It may be m 2 or more, 70 g / m 2 or more, 80 g / m 2 or more, 90 g / m 2 or more, and further 100 g / m 2 or more.
  • the upper limit of the PAO retention amount is, for example, 200 g / m 2 or less.
  • the life of the air filter filter medium 1 can be extended when used in an environment containing liquid particles. It should be noted that 500 Pa corresponds to a general pressure loss in which replacement of the air filter filter medium is considered.
  • the PAO holding amount of the air filter filter medium 1 can be evaluated as follows.
  • the air filter filter medium 1 which is the object to be evaluated is set in the above holder used for the evaluation of the pressure loss PD and the collection efficiency CE.
  • the weight of the filter medium 1 to be set (initial weight W 0 ) is measured in advance.
  • air is permeated through the set filter medium 1, and the linear velocity of the passing air is adjusted to 5.3 cm / sec by a flow meter.
  • the direction in which air flows is from the glass filter medium layer 3 of the filter medium 1 to the fluororesin porous film 2.
  • the polydisperse PAO particles are contained in the air passing through the filter medium 1 at a concentration of 0.2 to 0.5 g / m 3 and collected by the filter medium 1, and the filter medium 1 using a pressure gauge (manometer) is used.
  • a pressure gauge manometer
  • the linear velocity of the air passing through the filter medium 1 is maintained at 5.3 cm / sec.
  • the flow of air passing through the filter medium 1 is stopped.
  • the filter medium 1 is taken out from the holder and the weight (reached weight) W 1 (g) is measured.
  • PAO retention amount (g / m 2 ) [achieved weight W 1 (g) -initial weight W 0 (g)] / (100 cm 2 ⁇ 10 -4 ) (4)
  • the surface 12 on the upstream side of the airflow 11 in the glass filter medium layer 3 is used as an evaluation surface, and is evaluated in accordance with the abrasion strength test C method (Teva type method) specified in Japanese Industrial Standards (former Japanese Industrial Standards; JIS) L1096.
  • the weight loss of the air filter filter medium 1 after 10 times of rubbing may be 70.0 mg or less, 60.0 mg or less, 50.0 mg or less, 40.0 mg or less, 30.0 mg or less, 25.0 mg or less. It may be 20.0 mg or less, and further may be 15.0 mg or less.
  • the lower limit of the weight loss is, for example, 2.0 mg or more, and may be 5.0 mg or more, 7.0 mg or more, and further 10.0 mg or more.
  • the wear wheel used for carrying out the wear strength test C is No. Use CS-10 (load 2.45N).
  • the area in contact with the wear ring on the evaluation surface is a ring shape with an area of 30 cm 2 .
  • the rotation speed of the wear wheel is 60 times / minute.
  • the air filter filter medium 1 is suitable for use as an outside air filtration filter such as an intake filter for a turbine or an outside air introduction filter because the increase in pressure loss PD is suppressed even in an environment containing liquid particles.
  • the use of the air filter filter medium 1 is not limited to the above example.
  • the air filter filter medium 1 can be used for the same purposes as the conventional air filter filter medium.
  • the air filter filter medium 1 can be distributed in the form of a single leaf or a band, for example.
  • the band-shaped air filter filter medium 1 can also be distributed as a winding body wound around a winding core.
  • the air filter filter medium 1 can be used as a pleated filter pleated pack.
  • FIG. 6 shows an example of the filter pleated pack of the present embodiment.
  • the filter pleated pack 21 shown in FIG. 6 is composed of an air filter filter medium 1 folded in a pleated shape.
  • the filter pleated pack 21 is formed by pleating the air filter filter medium 1.
  • the air filter filter medium 1 is folded so as to have a continuous W shape when viewed from the side surface.
  • the pleated pack 21 is suitable for use in an environment containing liquid particles such as oil mist.
  • the filter pleated pack of the present invention may include additional members other than the air filter filter medium 1.
  • the filter pleated pack 21 shown in FIG. 6 further includes a resin string-like body called a bead 22.
  • the bead 22 is a kind of spacer that maintains the shape of the pleated air filter filter medium 1.
  • the bead 22 of FIG. 6 is arranged on the surface of the folded air filter filter medium 1 so as to proceed along the direction intersecting the pleated line 23 (mountain fold line and / or valley fold line) of the air filter filter medium 1.
  • the shape and arrangement of the bead 22 is not limited to the above example.
  • the filter pleated pack 21 may include a plurality of beads 22 arranged in parallel with each other at predetermined intervals in the extending direction of the pleated wire 23 when the arrangement surface of the beads 22 is viewed in a plane. In the example of FIG. 6, at least three beads 22 are arranged for each arrangement surface.
  • the bead 22 can be formed by applying a molten resin in a string shape. Examples of resins are polyamides and polyolefins.
  • the pleating of the air filter filter medium 1 can be carried out by a known method, for example, a reciprocating type or rotary type processing machine.
  • the air filter unit 31 shown in FIG. 7 includes a filter pleated pack 21 and a frame body 32 that supports the filter pleated pack 21.
  • the peripheral edge of the filter pleated pack 21 is supported by the frame body (support frame) 32.
  • the frame 32 is composed of, for example, a metal, a resin, or a composite material thereof.
  • the filter pleated pack 21 can be fixed to the frame body 32 at the same time as the molding of the frame body 32.
  • the configuration of the frame 32 may be the same as the configuration of the frame provided in the conventional air filter unit. Since the air filter filter medium 1 is provided, the air filter unit 31 is suitable for suppressing an increase in pressure loss even in an environment containing liquid particles such as oil mist.
  • the air filter unit 31 of FIG. 7 includes an air filter filter medium 1 as a filter pleated pack 21.
  • the configuration of the air filter unit of the present invention is not limited to the above example.
  • the air filter unit 31 may be a unit composed of a HEPA (high-efficiency particulate air grade) filter or a ULPA (ultra-low penetration air grade) filter defined in JIS Z8122: 2000.
  • HEPA high-efficiency particulate air grade
  • ULPA ultra-low penetration air grade
  • the C / Si ratio on the surface of the glass filter medium layer was evaluated using a scanning fluorescent X-ray analyzer ZSX Primus IV manufactured by Rigaku, which is a wavelength dispersion type evaluation device.
  • the C / Si ratio was evaluated as the ratio of the peak intensity of C to the peak intensity of Si shown in the fluorescent X-ray profile of the surface obtained by the evaluation.
  • the configuration and evaluation conditions of the device were as follows.
  • X-ray source X-ray tube with rhodium target X-ray output: 3 kW (acceleration voltage 30 kV, applied current 100 mA)
  • Spectral crystal For C, Rigaku artificial multilayer cumulative film
  • RX61 For Si pentaerythritol crystal
  • Sample size Disc-shaped with a diameter of 50 mm Measurement area: Set to a circle with a diameter of 30 mm centered on the center of the sample
  • PAO retention amount The PAO retention amount of the air filter filter medium was evaluated by the above method.
  • the polydisperse PAO particles used for the evaluation were PAO (Duracin 164) manufactured by Ineos and generated by a constant output aerosol atomizer (TSI No. 3076, manufactured by Tokyo Dylek).
  • the polydisperse PAO particles contained in the air passing through the evaluation target were single-peak particles having a number peak only in the range of particle size 0.1 to 0.2 ⁇ m.
  • PTFE porous membrane A A mixture was obtained by uniformly mixing 100 parts by weight of PTFE fine powder (manufactured by Daikin, Polyflon PTFE F-104) and 20 parts by weight of dodecane as a liquid lubricant. Next, the obtained mixture was extruded into a sheet using an extruder to obtain a strip-shaped PTFE sheet (thickness 1.5 mm, width 20 cm). Next, the obtained PTFE sheet was rolled with a pair of metal rolling rolls. The rolling was carried out while pulling the PTFE sheet in the longitudinal direction using another roll arranged downstream of the rolling roll so that the width of the PTFE sheet did not change before and after rolling. The thickness of the PTFE sheet after rolling was 200 ⁇ m.
  • the PTFE sheet was held in an atmosphere of 150 ° C. to remove the liquid lubricant, then stretched in the longitudinal direction at a stretching temperature of 300 ° C. and a stretching ratio of 25 times by a roll stretching method, and then stretched by a tenter stretching method.
  • An unfired PTFE porous film was obtained by stretching in the direction at a stretching temperature of 100 ° C. and a stretching ratio of 30 times.
  • the obtained porous membrane was fired at 400 ° C. using a hot air generator to obtain a strip-shaped PTFE porous membrane A.
  • glass filter medium layer B1 As the glass filter medium layer B1, a glass fiber filter medium having a thickness of 380 ⁇ m, a basis weight of 63 g / m 2 , and a surface C / Si ratio of 0.028 was prepared.
  • the glass filter medium layer B1 contained an acrylic resin as a binder for binding the glass fibers constituting the layer.
  • glass filter medium layer B2 As the glass filter medium layer B2, a glass fiber filter medium having a thickness of 400 ⁇ m, a basis weight of 68 g / m 2 , and a surface C / Si ratio of 0.029 was prepared.
  • the glass filter medium layer B2 contained an acrylic resin as a binder for binding the glass fibers constituting the layer.
  • glass filter medium layer B3 As the glass filter medium layer B3, a glass fiber filter medium having a thickness of 280 ⁇ m, a basis weight of 65 g / m 2 , and a surface C / Si ratio of 0.036 was prepared.
  • the glass filter medium layer B3 contained a polyvinyl acetate resin, which is a polyvinyl alcohol-based resin, as a binder for binding the glass fibers constituting the layer.
  • glass filter medium layer B4 As the glass filter medium layer B4, a glass fiber filter medium having a thickness of 280 ⁇ m, a basis weight of 65 g / m 2 , and a surface C / Si ratio of 0.021 was prepared.
  • the glass filter medium layer B4 contained a polyvinyl acetate resin, which is a polyvinyl alcohol-based resin, as a binder for binding the glass fibers constituting the layer.
  • glass filter medium layer B5 As the glass filter medium layer B5, a glass fiber filter medium having a thickness of 400 ⁇ m, a basis weight of 68 g / m 2 , and a surface C / Si ratio of 0.019 was prepared.
  • the glass filter medium layer B5 contained an acrylic resin as a binder for binding the glass fibers constituting the layer.
  • breathable support layer C a spunbonded non-woven fabric (manufactured by Unitika, Elves S0303WDO) composed of PET / PE composite fibers was prepared.
  • This PET / PE composite fiber has a core-sheath structure including a core portion of PET and a sheath portion of PE.
  • the thickness of the breathable support layer C was 220 ⁇ m, and the basis weight was 30 g / m 2 .
  • Example 1 The PTFE porous membrane A and the pair of breathable support layers C are laminated so that the breathable support layer C sandwiches the PTFE porous membrane A, and the whole is heat-laminated at 160 ° C. to obtain the breathable support layer C /.
  • a laminate having a three-layer structure of PTFE porous membrane A / breathable support layer C was obtained.
  • the obtained laminate and the glass filter medium layer B1 were joined by a breathable adhesive layer to obtain an air filter filter medium of Example 1.
  • a synthetic rubber-based hot melt adhesive (MORESCO, Morescomelt TN-286Z) is sprayed onto the exposed surface of the breathable support layer C in the laminated body at a basis weight of 8 g / m 2 , and then the coated surface is applied.
  • the glass filter medium layer B1 was pressure-bonded and laminated to the surface. A pair of rolls was used for the thermal laminating and the crimp laminating (the same applies to the following Examples and Comparative Examples).
  • Example 2 The air filter filter medium of Example 2 was obtained in the same manner as in Example 1 except that the glass filter medium layer B2 was used instead of the glass filter medium layer B1.
  • Example 3 The air filter filter medium of Example 3 was obtained in the same manner as in Example 1 except that the glass filter medium layer B3 was used instead of the glass filter medium layer B1.
  • Example 4 The air filter filter medium of Example 4 was obtained in the same manner as in Example 1 except that the glass filter medium layer B4 was used instead of the glass filter medium layer B1.
  • Comparative Example 1 An air filter filter medium of Comparative Example 1 was obtained in the same manner as in Example 1 except that the glass filter medium layer B5 was used instead of the glass filter medium layer B1.
  • the PAO retention amount of the examples was larger than that of the comparative example.
  • the air filter filter medium of the present invention can be used for the same purposes as the conventional air filter filter medium.
  • Examples of applications are air filter filter media, filter pleated packs and air filter units used for outside air treatment and turbine intake filters.

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PCT/JP2021/035723 2020-09-28 2021-09-28 エアフィルタ濾材、フィルタプリーツパック及びエアフィルタユニット Ceased WO2022065516A1 (ja)

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DE112021005099.0T DE112021005099T5 (de) 2020-09-28 2021-09-28 Luftfiltermedium, plisseefilterelement und luftfiltereinheit
CN202180066228.9A CN116234621A (zh) 2020-09-28 2021-09-28 空气过滤器滤材、过滤器褶裥组件及空气过滤器单元
US18/027,455 US12440794B2 (en) 2020-09-28 2021-09-28 Air filter medium, filter pleat pack, and air filter unit
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US12440794B2 (en) 2025-10-14

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