WO2024122160A1 - Matériau filtrant pour filtre à air, et son procédé de fabrication - Google Patents

Matériau filtrant pour filtre à air, et son procédé de fabrication Download PDF

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WO2024122160A1
WO2024122160A1 PCT/JP2023/034051 JP2023034051W WO2024122160A1 WO 2024122160 A1 WO2024122160 A1 WO 2024122160A1 JP 2023034051 W JP2023034051 W JP 2023034051W WO 2024122160 A1 WO2024122160 A1 WO 2024122160A1
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fibers
filter medium
beaten
biodegradable
ketene dimer
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PCT/JP2023/034051
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English (en)
Japanese (ja)
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祐希 山▲崎▼
栄子 目黒
正 佐藤
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北越コーポレーション株式会社
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Publication of WO2024122160A1 publication Critical patent/WO2024122160A1/fr

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  • This disclosure relates to air filter media used in various fields such as factory and building air conditioning, automobile passenger compartments, air conditioners, air purifiers, and personal protective equipment, and in particular to air filter media that have a small environmental impact and little degradation in filtering performance during use.
  • Glass fiber filter media and meltblown nonwoven fabric filter media are mainly used as medium to high performance filter media for air filters used in building air conditioning, etc.
  • Glass fiber filter media is non-flammable, so it is disposed of in landfills as industrial waste after use. This places a large burden on the environment when it is disposed of.
  • meltblown nonwoven fabric filter media mainly uses non-renewable and finite fossil resources (such as PP) as raw materials, and when incinerated, it emits a large amount of carbon dioxide over its entire life cycle. Furthermore, if it leaks into the environment after use, it will not decompose and will remain in the environment. For these reasons, there is a demand for filter media that contain renewable materials, have a small environmental impact, and are biodegradable.
  • filter media containing fibrillated lyocell fibers, biodegradable fibers, and regenerated or semi-synthetic fibers have been proposed (see Patent Document 1 or Patent Document 2).
  • cellulosic fibers such as lyocell fibers have high hygroscopic and water-absorbent properties, and therefore when used in a high-humidity environment or when air currents or dust containing moisture pass through, the fibers swell and the filter media structure changes, resulting in a problem of a decrease in the filtering performance of the air filter media, for example, a decrease in the PF value.
  • the PF value is defined by the formula 1, and the higher the PF value, the higher the dust particle collection efficiency, the lower the pressure loss, and the higher the filtering performance of the filter media.
  • transmittance [%] 100-collection efficiency [%].
  • the objective of this disclosure is to provide a filter media for air filters that contains renewable materials, is biodegradable, and has sufficient water repellency.
  • the air filter medium according to the present invention is a filter medium made of a wet nonwoven fabric, characterized in that the fibers constituting the filter medium include beaten fibers and unbeaten fibers, the beaten fibers are fibrillated lyocell fibers, the unbeaten fibers are biodegradable fibers, and the filter medium includes an alkyl ketene dimer.
  • the content of the alkyl ketene dimer in the entire filter medium is preferably in the range of 0.05 to 2.0% by mass. This makes it possible to obtain a filter medium with sufficient water repellency and a high PF value.
  • the biodegradable fiber is at least one selected from the group consisting of regenerated cellulose fiber, natural cellulose fiber, and polylactic acid-based fiber. This makes it possible to obtain a filter medium with a high PF value and biodegradability.
  • the air filter medium of the present invention may contain a biodegradable binder. This makes it possible to obtain a filter medium that is biodegradable and has sufficient strength and rigidity for processing and use of the filter.
  • the biodegradable binder may be polyvinyl alcohol and/or polylactic acid. This makes it possible to obtain a filter medium with sufficient strength and stiffness without significantly decreasing the PF value.
  • the alkyl ketene dimer is not covered with a continuous film of the biodegradable binder. This makes it possible to obtain a filter medium that has sufficient strength and rigidity while retaining water repellency.
  • the method for producing a filter medium for air filters according to the present invention is characterized by comprising a papermaking process in which a raw material slurry in which beaten fibers and non-beaten fibers are dispersed in water is made into a sheet by a wet papermaking method to form a wet sheet, a process in which an alkyl ketene dimer is applied to the wet sheet, and a drying process in which the wet sheet to which the alkyl ketene dimer has been applied is thermally dried to form a dry sheet.
  • This method makes it possible to obtain a filter medium with sufficient water repellency and a high PF value.
  • a binder may be dispersed in the raw material slurry together with the fibers. This makes it possible to obtain a filter medium with sufficient strength and rigidity without impairing the effect of the alkyl ketene dimer in improving water repellency and PF value.
  • the present disclosure makes it possible to obtain a filter medium that has a small environmental impact and exhibits little deterioration in filtering performance during use.
  • a filter medium for air filters that contains renewable materials, is biodegradable, and has sufficient water repellency to prevent moisture absorption by cellulosic fibers, including fibrillated lyocell fibers.
  • the lyocell fiber in this embodiment is a regenerated cellulose fiber spun by an organic solvent spinning method using N-methylmorpholine N-oxide as a solvent.
  • organic solvent spinning method cellulose is dissolved in an organic solvent as it is and spun, so there is little molecular breakage, the average degree of polymerization is higher than other regenerated cellulose fibers, the fiber has high rigidity, and the cross-sectional shape of the fiber is close to circular. This rigidity and cross-sectional shape make it easier to maintain the voids in the filter medium.
  • the fibrillated lyocell fiber after beating also maintains the rigidity and cross-sectional shape, making it easier to maintain the voids in the filter medium.
  • fibrillated by beating the surface area of the fiber that contributes to particle collection increases, increasing the collection efficiency, and the fibers become more entangled, increasing the tensile strength of the filter medium.
  • the beaten fibers in this embodiment are fibrillated lyocell fibers, and the amount of beaten fibers is preferably 2 to 30 parts, more preferably 3 to 20 parts, and even more preferably 5 to 15 parts, of 100 parts of the total of the beaten fibers, unbeaten fibers, and binder that make up the filter medium. If the amount is less than 2 parts, the surface area of the fibers that contributes to particle capture is insufficient, making it difficult to achieve sufficient capture efficiency. On the other hand, if the amount exceeds 30 parts, the fibers become too entangled and block the voids, resulting in a large increase in pressure loss compared to the increase in capture efficiency, and a decrease in the PF value.
  • a beating machine or disintegrator such as a Niagara beater, PFI mill, single disc refiner, double disc refiner, or deflaker can be used.
  • a beating machine or disintegrator such as a Niagara beater, PFI mill, single disc refiner, double disc refiner, or deflaker.
  • the length-weighted average fiber length of the fibrillated lyocell fibers used in the present invention is preferably 0.6 mm or more, more preferably 0.8 to 3 mm, and even more preferably 1 to 2 mm.
  • the length-weighted average fiber length of fibrillated lyocell fibers was measured in accordance with ISO16065-2:2014 "Determination of fiber length by automated optical analysis - Part 2: Unpolarized light method.”
  • the lyocell fiber undergoes fibrillation by beating, resulting in a thinner fiber diameter. If the fiber diameter is too thin, the fiber is more likely to be cut, resulting in the aforementioned problem of shortening the fiber length. On the other hand, if the fiber diameter is too thick, the surface area of the fiber that contributes to particle collection is insufficient.
  • the average fiber diameter of the fibrillated lyocell fiber used in this embodiment is preferably 0.3 ⁇ m or more, more preferably 0.4 to 1.5 ⁇ m, and even more preferably 0.5 to 1.0 ⁇ m.
  • the average fiber diameter of the fibrillated lyocell in this embodiment was calculated using the formula 2 from the specific surface area measured by the BET multipoint method using nitrogen.
  • the fiber density of Lyocell is assumed to be 1.5 g/ cm3 .
  • the non-beaten fibers in this embodiment are biodegradable fibers that have not been beaten, have not been fibrillated, or have a slightly fuzzy surface.
  • biodegradable fibers include regenerated cellulose fibers, natural cellulose fibers, polylactic acid-based fibers, polybutylene succinate fibers, and polyhydroxyalkanoate fibers.
  • the fibers do not melt during thermal drying and the molten fibers can be prevented from blocking the pores of the filter medium, thereby preventing a decrease in the PF value, it is preferable to use at least one type selected from the group consisting of regenerated cellulose fibers, natural cellulose fibers, and polylactic acid-based fibers.
  • Non-beaten fibers of different types and/or different fiber diameters may be mixed and used.
  • the amount of unbeaten fibers is preferably 50 to 98 parts, more preferably 60 to 95 parts, and even more preferably 70 to 90 parts, of 100 parts of the total of beaten fibers, unbeaten fibers, and binders that make up the filter medium. If the amount of unbeaten fibers is less than 50 parts, the amount of beaten fibers and/or binder will be high, resulting in a low PF value. On the other hand, if the amount of unbeaten fibers exceeds 98 parts, sufficient collection efficiency and/or strength and stiffness will not be obtained.
  • Regenerated cellulose fibers are made from cellulose, such as viscose rayon fibers spun using the viscose method and lyocell fibers spun using the organic solvent spinning method. These are renewable materials made from wood pulp, and are biodegradable in soil burials and in the ocean.
  • Natural cellulose fibers are fibers that are primarily made from cellulose extracted from plants, and include wood pulp, cotton linter pulp, hemp pulp, kenaf pulp, and mercerized pulp obtained by treating wood pulp with alkali. These are renewable materials made from plants and are biodegradable when buried in the soil.
  • Polylactic acid fiber is a fiber spun from polylactic acid, which is polymerized from lactic acid obtained by saccharification and fermentation of biomass-derived starch as a raw material, and is biodegradable when buried in soil. Unlike cellulose fiber, polylactic acid fiber has thermoplasticity, so it can be used to give thermoformability to filter media.
  • main fibers made of normal polylactic acid with a melting point of 170°C or higher binder fibers that partially use polylactic acid whose melting point has been lowered to less than 170°C by modifying the molecular structure are also used as polylactic acid main fibers.
  • polylactic acid main fibers are used as unbeaten fibers
  • polylactic acid binder fibers are used as a binder, which will be described later.
  • the non-beaten fibers preferably have an average fiber diameter of 5 ⁇ m or more, more preferably 6 to 50 ⁇ m, and even more preferably 7 to 40 ⁇ m. If the average fiber diameter is smaller than 5 ⁇ m, it becomes difficult to maintain the voids necessary to uniformly distribute the beaten fibers, which may cause an increase in pressure loss. On the other hand, if the average fiber diameter exceeds 50 ⁇ m, the difference in fiber diameter from the beaten fibers is large, which may cause a large variation in the pore size of the filter medium and a decrease in collection efficiency.
  • the alkyl ketene dimer in this embodiment is a dimer obtained by reacting naturally derived fatty acids (e.g. palmitic acid with 16 carbon atoms or stearic acid with 18 carbon atoms) via acid chloride. It is widely used as a sizing agent in paper to prevent ink from penetrating. It is also biodegradable, and its use as a water-resistant agent for biodegradable materials is being considered (see, for example, Non-Patent Document 1). In this embodiment, it is used to impart sufficient water repellency to the fibers that make up the filter medium and to prevent a decrease in the filter performance during use of the filter medium.
  • naturally derived fatty acids e.g. palmitic acid with 16 carbon atoms or stearic acid with 18 carbon atoms
  • acid chloride e.g. palmitic acid with 16 carbon atoms or stearic acid with 18 carbon atoms
  • It is widely used as a sizing agent in paper to prevent ink from pe
  • the content of alkyl ketene dimer in the entire filter medium is preferably 0.05 to 2.0 mass%, more preferably 0.1 to 1.8 mass%, and particularly preferably 0.6 to 1.7 mass%. If the content is less than 0.05 mass%, sufficient water repellency (e.g., 100 mm water column height) may not be obtained. On the other hand, if the content is 0.05 mass% or more, sufficient water repellency (e.g., 100 mm water column height) can be obtained, and if the content is 0.1 mass% or more, even higher water repellency (e.g., 200 mm water column height) can be obtained. If the alkyl ketene dimer content exceeds 2.0 mass%, the PF value may decrease.
  • the PF value of the filter medium can be increased by adjusting the content of alkyl ketene dimer in the entire filter medium to an appropriate range.
  • the mechanism by which this PF value is increased is unclear, it is presumed that when an appropriate amount of alkyl ketene dimer is attached to the surface of fibrillated lyocell fibers, the PF value is increased because the collection efficiency is increased by preventing the fibers from agglomerating and increasing the surface area of the fibers, and the pressure loss is reduced by expanding the gaps between the fibers.
  • a biodegradable binder may be contained in the filter medium for the purpose of improving strength and stiffness.
  • the biodegradable binder for example, polyvinyl alcohol, polylactic acid, or both polyvinyl alcohol and polylactic acid can be used.
  • Polyvinyl alcohol is biodegradable and bonds fibers together, and is either fibrous or powdery, which can be dispersed in water together with beaten fibers and non-beaten fibers to form a raw material slurry, or can be mixed with an alkyl ketene dimer to form an aqueous solution or aqueous dispersion that can be attached by a method such as impregnation or coating.
  • Polylactic acid is the polylactic acid binder fiber described above, which bonds fibers together when heated above its melting point. It is more preferable that the biodegradable binder is in powder form. It is uniformly dispersed and point-bonded to the fibers, so that high strength and stiffness can be obtained without significantly decreasing the PF value. It is particularly preferable that the powdered binder is polyvinyl alcohol. Even higher strength and stiffness can be obtained. On the other hand, biodegradable binders in the form of an aqueous solution or dispersion may form a continuous film that covers the fibers throughout the entire filter medium, lowering the PF value, so care must be taken not to apply too much.
  • the amount of the biodegradable binder is preferably 0.5 to 20 parts, and more preferably 1 to 15 parts, of 100 parts of the total of the fibers and binder that make up the filter medium. If the amount is less than 0.5 parts, there is a risk that sufficient improvement in strength and stiffness will not be obtained, and if it exceeds 20 parts, there is a risk that the PF value will decrease.
  • additives such as antifoaming agents and dispersants can be appropriately added to the filter medium as long as they do not impede the effects of the present invention.
  • the method for producing the filter medium in this embodiment uses a wet papermaking method. That is, the fibers that make up the filter medium are dispersed in water using a dispersing machine such as a pulper, the resulting raw material slurry is deposited on a wire and dehydrated to form a wet sheet, and the resulting wet sheet is impregnated with an alkyl ketene dimer by a method such as impregnation or coating, and dried using a dryer such as a hot air dryer or cylinder dryer to obtain the filter medium as a dry sheet. If an alkyl ketene dimer is imparted to the dried sheet, the effect of improving the PF value by the alkyl ketene dimer cannot be fully obtained.
  • a dispersing machine such as a pulper
  • the resulting raw material slurry is deposited on a wire and dehydrated to form a wet sheet
  • the resulting wet sheet is impregnated with an alkyl ketene dimer by a
  • the biodegradable binder in the raw material slurry together with the fibers that make up the filter medium in the production using the above-mentioned wet papermaking method it is preferable to disperse the biodegradable binder in the raw material slurry together with the fibers that make up the filter medium in the production using the above-mentioned wet papermaking method. If the biodegradable binder in the form of an aqueous solution or aqueous dispersion is mixed with the alkyl ketene dimer and applied simultaneously by a method such as impregnation or coating, the alkyl ketene dimer will be covered with a continuous film of the biodegradable binder, and there is a risk that sufficient water repellency will not be obtained. It is preferable to disperse the biodegradable binder in the raw material slurry together with the fibers that make up the filter medium to form a wet sheet, and then apply the alkyl ketene dimer to the wet sheet.
  • additives such as antifoaming agents and dispersants can be added to the raw material slurry as appropriate, as long as they do not impede the effects of the present invention.
  • the basis weight of the filter medium in this embodiment is not particularly limited, but is preferably 25 to 350 g/m 2 , more preferably 50 to 250 g/m 2 , and even more preferably 70 to 150 g/m 2 . If the basis weight is less than 25 g/m 2 , sufficient tensile strength and/or Gurley stiffness may not be obtained. On the other hand, if the basis weight is more than 350 g/m 2 , the area of the filter medium that can be accommodated in the filter unit may be insufficient.
  • the PF value of the filter medium in this embodiment is not particularly limited, but is preferably 4.5 or more, more preferably 6.0 or more, and even more preferably 7.0 or more. This results in a filter medium with a good balance between pressure loss and collection efficiency.
  • the tensile strength of the filter medium in this embodiment varies depending on the application and post-processing method, and is not particularly limited, but is preferably 0.40 kN/m or more, and more preferably 0.45 kN/m or more. A tensile strength of 0.40 kN/m or more can be used for many applications.
  • the Gurley stiffness of the filter medium in this embodiment differs depending on the application and post-processing method, and is not particularly limited, but is preferably 7.0 mN or more, and more preferably 10.0 mN or more.
  • a Gurley stiffness of 7.0 mN can be used for many applications.
  • Example 1 14 parts of fibrillated lyocell fiber (average fiber diameter 0.8 ⁇ m, length-weighted average fiber length 1.1 mm) obtained by beating lyocell fiber (manufactured by Lenzing AG) as beaten fiber, and 86 parts of regenerated cellulose fiber lyocell fiber (manufactured by Lenzing AG, average fiber diameter 12 ⁇ m, average fiber length 4 mm) as non-beaten fiber were added with tap water so that the slurry concentration was 0.5 mass%, and disintegrated using a mixer to obtain a raw material slurry. Next, the raw material slurry obtained using a hand-made papermaking device was made into a wet sheet.
  • the obtained wet sheet was impregnated with a water dilution of alkyl ketene dimer (SE2360, manufactured by Seiko PMC Co., Ltd.) so that the alkyl ketene dimer content in the entire filter material was 0.01 mass% in solid content, and dried using a rotary dryer at 130 ° C. to obtain a filter material for air filters with a basis weight of 100 g / m 2 as a dried sheet.
  • alkyl ketene dimer SE2360, manufactured by Seiko PMC Co., Ltd.
  • Example 13 Use 86 parts of mercerized pulp (Porosenia, manufactured by Rayonier Inc., average fiber diameter 34 ⁇ m, average fiber length 2.6 mm) as natural cellulose fiber as non-beaten fiber, and impregnate so that alkyl ketene dimer content is 1.0 mass% in solid content, and obtain air filter material with basis weight of 101g/ m2 by the same method as in Example 1.
  • mercerized pulp Porosenia, manufactured by Rayonier Inc., average fiber diameter 34 ⁇ m, average fiber length 2.6 mm
  • Example 14 As non-beaten fiber, use 76 parts of Lyocell fiber (manufactured by Lenzing AG, average fiber diameter 12 ⁇ m, average fiber length 4 mm) and 10 parts of polylactic acid-based fiber (PL01, manufactured by Unitika Co., Ltd., average fiber diameter 13 ⁇ m, average fiber length 5 mm, melting point 170 ° C.), but use the same method as in Example 13 to obtain air filter material with basis weight of 101 g / m 2 .
  • Lyocell fiber manufactured by Lenzing AG, average fiber diameter 12 ⁇ m, average fiber length 4 mm
  • PL01 manufactured by Unitika Co., Ltd., average fiber diameter 13 ⁇ m, average fiber length 5 mm, melting point 170 ° C.
  • Example 15 Use 84 parts of Lyocell fiber (manufactured by Lenzing AG, average fiber diameter 12 ⁇ m, average fiber length 4 mm) as non-beaten fiber, and 2 parts of polyvinyl alcohol powder (Poval K-177, manufactured by Denka Co., Ltd.) as binder to obtain raw material slurry, and obtain air filter material with basis weight of 101 g/ m2 by the same method as in Example 13.
  • Lyocell fiber manufactured by Lenzing AG, average fiber diameter 12 ⁇ m, average fiber length 4 mm
  • polyvinyl alcohol powder Polyvinyl alcohol powder
  • Example 16 As non-beaten fiber, 76 parts of Lyocell fiber (manufactured by Lenzing AG, average fiber diameter 12 ⁇ m, average fiber length 4 mm) and as binder, 10 parts of core-sheath type polylactic acid binder fiber (PL80, manufactured by Unitika Co., Ltd., average fiber diameter 15 ⁇ m, average fiber length 5 mm, core melting point 170 ° C, sheath melting point 130 ° C) are used to obtain raw material slurry, and by the same method as in Example 13, obtain air filter material with basis weight of 101 g / m 2 .
  • Lyocell fiber manufactured by Lenzing AG, average fiber diameter 12 ⁇ m, average fiber length 4 mm
  • core-sheath type polylactic acid binder fiber PL80, manufactured by Unitika Co., Ltd., average fiber diameter 15 ⁇ m, average fiber length 5 mm, core melting point 170 ° C, sheath melting point 130 ° C
  • Example 17 The aqueous solution of polyvinyl alcohol (Poval 28-98, manufactured by Kuraray Co., Ltd.) and alkyl ketene dimer (SE2360, manufactured by Seiko PMC Co., Ltd.) are mixed to form a water dilution, so that the polyvinyl alcohol content of the entire filter medium is 2.0 mass% in solid content, and the alkyl ketene dimer content is 1.0 mass% in solid content. Except for this, the same method as in Example 1 is used to obtain an air filter medium with a basis weight of 103 g/ m2 .
  • the air filter media obtained in the examples and comparative examples were evaluated using the methods described below.
  • Basis weight was measured according to JIS P 8124:2011 "Paper and paperboard -- Determination of basis weight”.
  • ⁇ Thickness and density> The thickness and density were measured in accordance with JIS P 8118:1998 "Paper and paperboard -- Test method for thickness and density” using a measurement pressure of 50 kPa.
  • the pressure loss was measured as the differential pressure when air was passed through an air filter medium having an effective area of 100 cm2 at a face velocity of 5.3 cm/sec using a manometer (Manometer Gauge WO81, manufactured by Yamamoto Electric Works, Ltd.).
  • the transmittance was calculated from the ratio of the number of particles upstream and downstream when air containing polydisperse polyalphaolefin (PAO) particles generated by a Laskin nozzle was blown through an air filter medium with an effective area of 100 cm2 at a surface velocity of 5.3 cm/sec, and the number of PAO particles upstream and downstream was measured using a laser particle counter (KC-22B, manufactured by Rion Co., Ltd.).
  • the target particle size was 0.3 ⁇ m
  • the transmittance was calculated as the geometric mean value of the transmittance of 0.2 to 0.3 ⁇ m and 0.3 to 0.4 ⁇ m.
  • PF value> The PF value was calculated from the pressure loss and the transmittance using the formula shown in Equation 1.
  • Water repellency was measured according to MIL-STD-282.
  • Gurley stiffness was measured according to JAPAN TAPPI No. 40:2000 "Paper and paperboard -- Test method for stiffness by bending under load -- Gurley method.”
  • Examples 1 to 12 in Table 1 and Comparative Example 1 in Table 2 show that by setting the alkyl ketene dimer content to 0.05% by mass or more, air filter media with sufficient water repellency at a water column height of 100 mm or more can be obtained, and by setting it to 0.1% by mass or more, even higher water repellency at a water column height of 200 mm or more can be obtained.
  • Example 6 in Table 1 and Examples 13 and 14 in Table 2 show that by using regenerated cellulose fiber, natural cellulose fiber and/or polylactic acid-based fiber as the non-beaten fiber, sufficient water repellency (water column height of 100 mm or more), PF value (4.5 or more), tensile strength (0.4 kN/m or more) and Gurley stiffness (7.0 mN or more) were obtained.
  • Example 6 in Table 1 and Examples 15 and 16 in Table 2 show that high tensile strength and Gurley stiffness were obtained by using a binder.
  • Example 6 in Table 1 and Comparative Example 2 in Table 2 show that adding alkyl ketene dimer resulted in higher water repellency than when a paraffin wax water repellent was added.
  • the air filter medium of the present invention can be used as an air filter medium for use in a variety of fields, including factory and building air conditioning, automobile passenger compartments, air conditioners, air purifiers, and personal protective equipment.
  • composition includes a plurality of such compositions, as well as a single composition.

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Abstract

Le but de la présente invention est de fournir un matériau filtrant pour un filtre à air ; ledit matériau filtrant contient un matériau renouvelable présentant une biodégradabilité et en outre un caractère hydrofuge suffisant. Selon la présente invention, le matériau filtrant pour un filtre à air comprend un tissu non tissé humide et est caractérisé en ce que des fibres constituant le matériau de filtre comprennent des fibres battues et des fibres non battues ; les fibres battues sont des fibres Lyocell fibrillées ; les fibres non battues sont des fibres biodégradables ; et le matériau filtrant comprend un dimère d'alkylcétène.
PCT/JP2023/034051 2022-12-05 2023-09-20 Matériau filtrant pour filtre à air, et son procédé de fabrication WO2024122160A1 (fr)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006167659A (ja) * 2004-12-17 2006-06-29 Mitsubishi Paper Mills Ltd 濾材
JP2011036763A (ja) * 2009-08-07 2011-02-24 Tomoegawa Paper Co Ltd エアフィルタ濾材およびその製造方法
JP2014221456A (ja) * 2013-05-13 2014-11-27 北越紀州製紙株式会社 エアフィルタ用濾材及びその製造方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006167659A (ja) * 2004-12-17 2006-06-29 Mitsubishi Paper Mills Ltd 濾材
JP2011036763A (ja) * 2009-08-07 2011-02-24 Tomoegawa Paper Co Ltd エアフィルタ濾材およびその製造方法
JP2014221456A (ja) * 2013-05-13 2014-11-27 北越紀州製紙株式会社 エアフィルタ用濾材及びその製造方法

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