WO2011158408A1 - 防水通気フィルタおよびその使用 - Google Patents
防水通気フィルタおよびその使用 Download PDFInfo
- Publication number
- WO2011158408A1 WO2011158408A1 PCT/JP2011/001698 JP2011001698W WO2011158408A1 WO 2011158408 A1 WO2011158408 A1 WO 2011158408A1 JP 2011001698 W JP2011001698 W JP 2011001698W WO 2011158408 A1 WO2011158408 A1 WO 2011158408A1
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- WO
- WIPO (PCT)
- Prior art keywords
- resin film
- waterproof
- ventilation filter
- holes
- waterproof ventilation
- Prior art date
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- 239000011347 resin Substances 0.000 claims abstract description 72
- 229920005989 resin Polymers 0.000 claims abstract description 72
- 238000009423 ventilation Methods 0.000 claims description 38
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- 239000000243 solution Substances 0.000 claims description 15
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 7
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 7
- 239000007800 oxidant agent Substances 0.000 claims description 6
- 239000002033 PVDF binder Substances 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- -1 polyethylene terephthalate Polymers 0.000 claims description 5
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 5
- 239000004642 Polyimide Substances 0.000 claims description 4
- 239000012670 alkaline solution Substances 0.000 claims description 4
- 229920001721 polyimide Polymers 0.000 claims description 4
- 229920000515 polycarbonate Polymers 0.000 claims description 3
- 239000004417 polycarbonate Substances 0.000 claims description 3
- 239000011112 polyethylene naphthalate Substances 0.000 claims description 3
- 239000003513 alkali Substances 0.000 claims description 2
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 229920003207 poly(ethylene-2,6-naphthalate) Polymers 0.000 claims description 2
- 230000002209 hydrophobic effect Effects 0.000 abstract description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 31
- 239000004810 polytetrafluoroethylene Substances 0.000 description 31
- 239000012528 membrane Substances 0.000 description 23
- 239000010410 layer Substances 0.000 description 19
- 230000035699 permeability Effects 0.000 description 18
- 239000000463 material Substances 0.000 description 16
- 238000005530 etching Methods 0.000 description 11
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 6
- 238000010884 ion-beam technique Methods 0.000 description 6
- 239000003921 oil Substances 0.000 description 6
- 239000011148 porous material Substances 0.000 description 5
- 238000001035 drying Methods 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000010687 lubricating oil Substances 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 230000002940 repellent Effects 0.000 description 3
- 239000005871 repellent Substances 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 239000002585 base Substances 0.000 description 2
- 229910052731 fluorine Inorganic materials 0.000 description 2
- 239000011737 fluorine Substances 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 239000004745 nonwoven fabric Substances 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 239000012286 potassium permanganate Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000005708 Sodium hypochlorite Substances 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 238000005273 aeration Methods 0.000 description 1
- 239000004760 aramid Substances 0.000 description 1
- 229920003235 aromatic polyamide Polymers 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- QBWCMBCROVPCKQ-UHFFFAOYSA-N chlorous acid Chemical compound OCl=O QBWCMBCROVPCKQ-UHFFFAOYSA-N 0.000 description 1
- 229940077239 chlorous acid Drugs 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000003301 hydrolyzing effect Effects 0.000 description 1
- QWPPOHNGKGFGJK-UHFFFAOYSA-N hypochlorous acid Chemical compound ClO QWPPOHNGKGFGJK-UHFFFAOYSA-N 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000001000 micrograph Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 125000005010 perfluoroalkyl group Chemical group 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000009823 thermal lamination Methods 0.000 description 1
- 239000002759 woven fabric Substances 0.000 description 1
Images
Classifications
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- 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
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- 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
-
- 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
-
- 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
- B01D46/56—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition
- B01D46/62—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition connected in series
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/22—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by diffusion
- B01D53/228—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by diffusion characterised by specific membranes
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D67/00—Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
- B01D67/0081—After-treatment of organic or inorganic membranes
- B01D67/0088—Physical treatment with compounds, e.g. swelling, coating or impregnation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
- B01D69/02—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor characterised by their properties
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- 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
- B01D71/48—Polyesters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
- B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
- B32B3/266—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by an apertured layer, the apertures going through the whole thickness of the layer, e.g. expanded metal, perforated layer, slit layer regular cells B32B3/12
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
- B32B5/32—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed at least two layers being foamed and next to each other
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K5/00—Casings, cabinets or drawers for electric apparatus
- H05K5/06—Hermetically-sealed casings
- H05K5/068—Hermetically-sealed casings having a pressure compensation device, e.g. membrane
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
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- 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
- B01D2239/04—Additives and treatments of the filtering material
- B01D2239/0414—Surface modifiers, e.g. comprising ion exchange groups
- B01D2239/0428—Rendering the filter material hydrophobic
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- B01D—SEPARATION
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- B01D2239/12—Special parameters characterising the filtering material
- B01D2239/1216—Pore size
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- B01D—SEPARATION
- B01D2279/00—Filters adapted for separating dispersed particles from gases or vapours specially modified for specific uses
- B01D2279/35—Filters adapted for separating dispersed particles from gases or vapours specially modified for specific uses for venting arrangements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2279/00—Filters adapted for separating dispersed particles from gases or vapours specially modified for specific uses
- B01D2279/45—Filters adapted for separating dispersed particles from gases or vapours specially modified for specific uses for electronic devices, e.g. computers, hard-discs, mobile phones
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2323/00—Details relating to membrane preparation
- B01D2323/04—Hydrophobization
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2325/00—Details relating to properties of membranes
- B01D2325/02—Details relating to pores or porosity of the membranes
- B01D2325/0281—Fibril, or microfibril structures
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
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- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/726—Permeability to liquids, absorption
- B32B2307/7265—Non-permeable
Definitions
- the present invention relates to, for example, a waterproof ventilation filter mounted on a housing and use of the waterproof ventilation filter.
- an automobile ECU Electronic Control Unit
- an automobile electrical component such as a motor, a lamp, and a sensor
- an electric toothbrush such as a shaver
- a home appliance such as a mobile phone, a solar cell, etc.
- An opening is provided in the body for the purpose of eliminating the pressure difference between the inside and outside of the housing, and the opening is closed with a waterproof ventilation filter.
- This waterproof ventilation filter prevents intrusion of foreign matters such as water and dust into the casing while ensuring ventilation inside and outside the casing.
- a polytetrafluoroethylene (PTFE) porous film having good air permeability and high water pressure resistance is often used (for example, see Patent Document 1).
- the PTFE porous membrane is usually obtained by forming PTFE fine powder into a sheet shape and stretching the sheet-like formed body in two directions orthogonal to each other.
- the PTFE porous membrane has a complicated porous structure composed of fibrils and nodes, and the pore diameter thereof is not uniform. For this reason, in the waterproof breathable filter using the PTFE porous membrane, when the air permeability is measured, the air permeability varies depending on the location, and the air permeability varies. Therefore, measures such as increasing the area of the waterproof ventilation filter may be taken in order to stabilize the quality of the waterproof ventilation filter.
- an object of the present invention is to provide a waterproof breathable filter having stable breathability and use of the waterproof breathable filter.
- the present invention is a waterproof ventilation filter for preventing water from entering while ensuring ventilation, and is a non-porous resin film that penetrates the resin film in the thickness direction. And a resin film having a plurality of through holes formed thereon, and at least one surface of both sides in the thickness direction of the resin film so as to have openings at positions corresponding to the plurality of through holes.
- a waterproof ventilation filter is provided that is uniformly distributed so as to fit in a specific band.
- the “size” with respect to the through hole is the diameter of a circle equal to the cross-sectional area of the through hole.
- the present invention uses a waterproof ventilation filter that closes an opening provided in the casing using the waterproof ventilation filter and eliminates a pressure difference between the inside and the outside of the casing via the waterproof ventilation filter. I will provide a.
- waterproofness can be ensured by the treatment layer on the resin film while allowing ventilation through the through-hole formed in the resin film. Moreover, since the through holes have a predetermined size and are uniformly distributed, it is possible to impart a uniform air permeability to the waterproof air-permeable filter.
- FIG. 1 shows a waterproof ventilation filter 1 according to an embodiment of the present invention.
- This waterproof ventilation filter 1 is for preventing water from entering while ensuring ventilation.
- the waterproof ventilation filter 1 is attached to the casing so as to close an opening provided in the casing (not shown), and the pressure difference between the inside and the outside of the casing is eliminated via the waterproof ventilation filter 1. Used for.
- the waterproof breathable filter 1 includes a non-porous resin film 2 and a treatment layer 3 formed on the resin film 2.
- non-porous means a solid that is clogged with resin.
- the resin film 2 is formed with a plurality of through holes 21 penetrating the resin film 2 in the thickness direction.
- the through holes 21 are open on both surfaces in the thickness direction of the resin film 2.
- the through hole 21 is typically a straight hole that penetrates the resin film 2 linearly with a constant cross-sectional shape.
- Such a through hole can be formed by, for example, ion beam irradiation and etching. Further, in the ion beam irradiation and etching, a through hole having a uniform size and axial direction can be formed in the resin film 2.
- the cross-sectional shape of the through hole 21 is not particularly limited, and may be circular or indefinite.
- the axial direction of the through-hole 21 does not need to be a direction perpendicular
- the through hole 21 has a predetermined size of 0.01 ⁇ m or more and 10 ⁇ m or less. Note that the size of the through holes 21 does not have to be completely the same in all the through holes 21, and can be regarded as substantially the same value in all the through holes 21 (for example, the standard deviation is 10% of the average value). Or less).
- the size of the through-hole 21 can be adjusted by the etching time and the etching processing solution concentration. A preferable size of the through hole 21 is 0.5 ⁇ m or more and 5 ⁇ m or less.
- the through-hole 21 has a specific band in the range of density of 10 to 1 ⁇ 10 8 pieces / mm 2 over the entire surface of the resin film 2 (for example, the maximum density is 1.5 times the minimum density or less). Are uniformly distributed.
- the density of the through holes 21 can be adjusted by the ion irradiation amount at the time of ion beam irradiation.
- a preferable density of the through holes 21 is 1 ⁇ 10 3 to 1 ⁇ 10 7 holes / mm 2 .
- the porosity of the resin film 2 (the ratio of the sum of the cross-sectional areas of all the through holes 21 to the area defined by the contour of the resin film 2) is not particularly limited, but from the viewpoint of maintaining film strength that can withstand the intended use, It is preferably 50% or less, and more preferably 35% or less.
- the thickness of the resin film 2 is not particularly limited, but in order to realize a structure with a small pore diameter (high water pressure resistance) and a high porosity (high air permeability) (to form a small-diameter hole even with a thick substrate).
- the ratio of the thickness of the resin film 2 to the predetermined size (T / D where D is the predetermined size and T is the thickness of the resin film) is preferably 1 or more and 10,000 or less. The following is more preferable.
- the material which comprises the resin film 2 is not specifically limited, Resin which decomposes
- the resin film 2 is made of at least one resin selected from polyethylene terephthalate (PET), polycarbonate (PC), polyimide (PI), polyethylene naphthalate (PEN), and polyvinylidene fluoride (PVdF).
- an etching treatment liquid such as an alkali solution or an oxidant solution corresponding to the material constituting the resin film 2 is used.
- an alkaline solution such as potassium hydroxide or sodium hydroxide can be used as a solution for hydrolyzing the resin.
- an oxidant solution such as a chlorous acid aqueous solution, a hypochlorous acid aqueous solution, a hydrogen peroxide solution, and a potassium permanganate solution can be used as a solution for oxidatively decomposing the resin.
- the resin film 2 when the resin film 2 is composed of any of PET, PEN, and PC, a solution containing sodium hydroxide as a main component is used as the etching treatment liquid, and when the resin film 2 is composed of PI, the etching treatment liquid A solution containing sodium hypochlorite as a main component is used.
- the resin film 2 is composed of PVdF
- PVdF is decomposed using a solution obtained by adding potassium permanganate to a solution mainly composed of sodium hydroxide as an etching treatment solution.
- a membrane filter sold by Oxyphen or Millipore can be used as the resin film 2 in which the through hole 21 is formed.
- the resin film 2 does not necessarily need to be a single layer, and may be divided into a plurality of layers.
- the treatment layer 3 is formed on one surface of both surfaces in the thickness direction of the resin film 2 in FIG. 1, but may be formed on both surfaces of the resin film 2. That is, the treatment layer 3 only needs to be formed on at least one of the two surfaces in the thickness direction of the resin film 2.
- the treatment layer 3 is formed so as to have an opening 31 at a position corresponding to the through hole 21 and has hydrophobicity and oil repellency.
- a treatment layer 3 can be formed by thinly applying a hydrophobic oil repellent on the resin film 2 and drying it.
- oil repellent include a fluorine-based coating agent having a perfluoroalkyl group.
- the thickness of the processing layer 3 is less than half of the predetermined size regarding the through-hole 21 mentioned above.
- the inner peripheral surface of the through holes 21 can also be covered with a second treatment layer continuous with the treatment layer 3. Is possible.
- the size of the opening 31 of the processing layer 3 is smaller than the size of the through hole 21 by the amount of the second processing layer.
- the resin film 2 may be laminated with a breathable support material 4 as shown in FIG.
- the air-permeable support material 4 may be laminated on the surface of the resin film 2 where the treatment layer 3 is not formed, or may be treated on the surface of the resin film 2 where the treatment layer 3 is formed.
- the layers 3 may be laminated.
- the air-permeable support material 4 may be laminated
- the breathable support material 4 is preferably one that is more breathable than the resin film 2, and for example, a woven fabric, a nonwoven fabric, a net, a mesh, or the like can be used.
- polyester, polyethylene, an aramid resin etc. are mentioned, for example.
- the resin film 2 and the breathable support material 4 are joined by a normal method such as heat welding or adhesion with an adhesive.
- the resin film 2 and the air-permeable support material 4 are partially bonded, and the area of the bonded portion is preferably 5 to 20% of the total area. This is because the resin film 2 and the air-permeable support material 4 are easily peeled off when the area of the joint portion is less than 5% of the total area, and the water pressure resistance is lowered at the joint portion when the area exceeds 20%.
- the waterproof pressure measured in accordance with JIS L1092-A (low water pressure method) or JIS L1092-B (high water pressure method) in the waterproof breathable filter 1 having the above configuration is preferably 1 kPa or more and 1000 kPa or less.
- waterproofness can be ensured by the treatment layer 3 on the resin film 2 while allowing ventilation through the through-holes 21 formed in the resin film 2. Moreover, since the through-holes 21 have a predetermined size and are uniformly distributed, it is possible to impart uniform air permeability to the waterproof air-permeable filter 1 over the entire surface.
- a plurality of porous PTFE membranes may be laminated in order to increase the thickness.
- water may leak from the interface between the PTFE porous membranes at a pressure lower than the water pressure resistance of the PTFE porous membrane alone during the pressure test.
- the waterproof breathable film 1 of the present embodiment it is only necessary to use the thick resin film 2 in order to increase the thickness, so that there is no problem during the water pressure resistance test.
- heavy ions may be irradiated with high acceleration and high density at the time of ion beam irradiation.
- the waterproof ventilation filter using the PTFE porous membrane has low tensile strength.
- the waterproof ventilation filter 1 of this embodiment is unstretched, its tensile strength is high. That is, according to the waterproof breathable filter 1 of the present embodiment, improvement in workability and resistance to external force can be expected.
- the resin film 2 of the same material as the air permeable support material 4 can be used in the case of using the air permeable support material 4 in the configuration of this embodiment, for example, the compatibility at the time of thermal lamination is improved.
- the adhesive strength between the breathable support material 4 and the resin film 2 can be improved.
- Example 1 As the resin film, Sample A (Oxydisk manufactured by Oxyphen) having a thickness of 22 ⁇ m in which circular through-holes having a diameter of 0.8 ⁇ m were formed by ion beam irradiation and etching on a non-porous base sheet made of PET was used.
- the air permeability (Gurley number) of sample A is 2.7 seconds / 100 mL on average, and the standard deviation is 0.169 seconds / 100 mL. there were.
- the density of the through holes was 3.6 ⁇ 10 5. It was ⁇ 5.5 ⁇ 10 5 pieces / mm 2 .
- a fluorine-based treating agent (X-70-029C manufactured by Shin-Etsu Chemical Co., Ltd.) is applied to the other side of the resin film. It was applied and dried to form a treatment layer having hydrophobicity and oil repellency. The thickness of the treatment layer was 0.1 ⁇ m. Thereby, a waterproof ventilation filter was obtained.
- Example 2 Example except that a sample B (Oxydisk manufactured by Oxyphen) having a thickness of 20 ⁇ m in which a through-hole having a diameter of 3.0 ⁇ m was formed on a non-porous base sheet made of PET by ion beam irradiation and etching was used as a resin film In the same manner as in Example 1, a waterproof ventilation filter was obtained.
- the air permeability (Gurley number) of sample B was 1.1 seconds / 100 mL on average, and the standard deviation was 0.035 seconds / 100 mL. there were.
- the density of the through holes was 7.0 ⁇ 10 3. It was ⁇ 9.5 ⁇ 10 3 pieces / mm 2 .
- Example 1 A waterproof air-permeable filter was obtained in the same manner as in Example 1 except that the PTFE porous membrane A having a thickness of 20 ⁇ m and an average pore diameter of 0.5 ⁇ m was used instead of the resin film.
- the PTFE porous membrane A is prepared by first extruding a PTFE fine powder mixed with a liquid lubricant into a sheet shape, then rolling and drying the sheet-like molded body, and at 380 ° C. above the melting point of PTFE. The film was stretched 5 times in the vertical direction and 8 times in the horizontal direction.
- the air permeability (Gurley number) of the PTFE porous membrane A is 11.9 seconds / 100 mL on average, and the standard deviation is 3 450 sec / 100 mL.
- Example 2 A waterproof breathable filter was obtained in the same manner as in Example 1 except that the PTFE porous membrane B having a thickness of 20 ⁇ m and an average pore diameter of 0.8 ⁇ m was used instead of the resin film.
- the PTFE porous membrane B is formed by first extruding a PTFE fine powder mixed with a liquid lubricant into a sheet shape, then rolling and drying the sheet-like molded body, and at 280 ° C. below the melting point of PTFE. It was made by stretching 4.5 times in the vertical direction and 15 times in the horizontal direction.
- the air permeability (Gurley number) of the PTFE porous membrane A is 1.1 seconds / 100 mL on average, and the standard deviation is 0. 167 sec / 100 mL.
- Example 3 A waterproof air-permeable filter was obtained in the same manner as in Example 1 except that a PTFE porous membrane C having a thickness of 70 ⁇ m and an average pore diameter of 3.0 ⁇ m was used instead of the resin film.
- the PTFE porous membrane C is prepared by first extruding a mixture of a PTFE fine powder and a liquid lubricant into a sheet shape, then rolling and drying the sheet-like molded body, and then at a temperature of 380 ° C. above the melting point of PTFE. The film was stretched 10 times in the vertical direction and 8 times in the horizontal direction.
- the air permeability (Gurley number) of the PTFE porous membrane C is 1.7 seconds / 100 mL on average, and the standard deviation is 0. 263 sec / 100 mL.
- test For the waterproof and aeration filters of Examples and Comparative Examples, the air permeability was measured at 20 locations in accordance with JIS P8117, and the average value and standard deviation were calculated. Further, the standard deviation was divided by the average value, and a numerical value obtained by multiplying it by 100 was calculated as the variation rate.
- the waterproof ventilation filter of the example using the resin film in which the through holes are formed has a smaller variation rate than the waterproof ventilation filter of the comparative example using the PTFE porous membrane. Moreover, in the waterproof ventilation filter of an Example, the water pressure resistance is also high.
- the waterproof breathable filter of the present invention can be used for outdoor lamps such as outdoor lights and lamps for trains, for example, in addition to automobile electrical components, home appliances, and solar cells.
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Abstract
Description
樹脂フィルムとして、PETからなる無孔のベースシートに、イオンビーム照射およびエッチングにより直径0.8μmの円形の貫通孔を形成した厚さ22μmのサンプルA(オキシフェン社製Oxydisk)を用いた。
樹脂フィルムとして、PETからなる無孔のベースシートに、イオンビーム照射およびエッチングにより直径3.0μmの貫通孔を形成した厚さ20μmのサンプルB(オキシフェン社製Oxydisk)を用いた以外は実施例1と同様にして防水通気フィルタを得た。
樹脂フィルムの代わりに、厚さ20μm、平均孔径0.5μmのPTFE多孔質膜Aを用いた以外は実施例1と同様にして防水通気フィルタを得た。PTFE多孔質膜Aは、まずPTFE微粉末に液状潤滑剤を混合したものを押し出してシート状に成形し、ついでシート状成形体を圧延するとともに乾燥させた後に、PTFEの融点以上の380℃で縦方向に5倍、横方向に8倍に延伸して作製した。
樹脂フィルムの代わりに、厚さ20μm、平均孔径0.8μmのPTFE多孔質膜Bを用いた以外は実施例1と同様にして防水通気フィルタを得た。PTFE多孔質膜Bは、まずPTFE微粉末に液状潤滑剤を混合したものを押し出してシート状に成形し、ついでシート状成形体を圧延するとともに乾燥させた後に、PTFEの融点以下の280℃で縦方向に4.5倍、横方向に15倍に延伸して作製した。
樹脂フィルムの代わりに、厚さ70μm、平均孔径3.0μmのPTFE多孔質膜Cを用いた以外は実施例1と同様にして防水通気フィルタを得た。PTFE多孔質膜Cは、まずPTFE微粉末に液状潤滑剤を混合したものを押し出してシート状に成形し、ついでシート状成形体を圧延するとともに乾燥させた後に、PTFEの融点以上の380℃で縦方向に10倍、横方向に8倍に延伸して作製した。
実施例および比較例の防水通気フィルタに対して、JIS P8117に準拠して20箇所で通気度を測定し、平均値および標準偏差を算出した。さらに、標準偏差を平均値で割り、それに100を掛けた数値を変動率として算出した。
Claims (8)
- 通気を確保しつつ水の浸入を防止するための防水通気フィルタであって、
非多孔質の樹脂フィルムであって該樹脂フィルムを厚さ方向に貫通する複数の貫通孔が形成された樹脂フィルムと、
前記樹脂フィルムの厚さ方向の両面のうちの少なくとも一方の面上に、前記複数の貫通孔と対応する位置に開口を有するように形成された、疎水性および撥油性を有する処理層と、を備え、
前記複数の貫通孔は、0.01μm以上10μm以下の所定のサイズを有し、密度が10~1×108個/mm2の範囲のうちの特定の帯域に収まるように一様に分布している、防水通気フィルタ。 - 前記樹脂フィルムの気孔率が50%以下である、請求項1に記載の防水通気フィルタ。
- 前記所定のサイズに対する前記樹脂フィルムの厚さの比が1以上10000以下である、請求項1に記載の防水通気フィルタ。
- 前記樹脂フィルムは、アルカリ溶液、酸化剤溶液、または酸化剤を含むアルカリ溶液により分解する樹脂からなる、請求項1に記載の防水通気フィルタ。
- 前記樹脂は、ポリエチレンテレフタレート、ポリカーボネート、ポリイミド、ポリエチレンナフタレートおよびポリフッ化ビニリデンから選ばれる少なくとも1種である、請求項4に記載の防水通気フィルタ。
- 前記樹脂フィルムに積層された通気性支持材をさらに備える、請求項1に記載の防水通気フィルタ。
- JIS L1092-A(低水圧法)またはJIS L1092-B(高水圧法)に準拠して測定した耐水圧が1kPa以上1000kPa以下である、請求項1に記載の防水通気フィルタ。
- 請求項1に記載された防水通気フィルタを用いて筐体に設けられた開口を塞ぎ、前記防水通気フィルタを介して前記筐体の内部と外部の圧力差を解消する、防水通気フィルタの使用。
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KR1020137001031A KR20130024950A (ko) | 2010-06-16 | 2011-03-23 | 방수 통기 필터 및 그의 용도 |
KR1020177030335A KR20170120211A (ko) | 2010-06-16 | 2011-03-23 | 방수 통기 필터 및 그의 용도 |
US13/702,833 US9005334B2 (en) | 2010-06-16 | 2011-03-23 | Water-proof air-permeable filter and use of the same |
EP11795316.6A EP2583733B1 (en) | 2010-06-16 | 2011-03-23 | Waterproof air-permeable filter and use of the same |
KR1020197010743A KR102241666B1 (ko) | 2010-06-16 | 2011-03-23 | 방수 통기 필터 및 그의 용도 |
CN201180029812.3A CN102985153B (zh) | 2010-06-16 | 2011-03-23 | 防水透气过滤器及其用途 |
US14/638,659 US9636616B2 (en) | 2010-06-16 | 2015-03-04 | Water-proof air-permeable filter and use of the same |
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US14/638,659 Continuation US9636616B2 (en) | 2010-06-16 | 2015-03-04 | Water-proof air-permeable filter and use of the same |
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Also Published As
Publication number | Publication date |
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CN102985153A (zh) | 2013-03-20 |
EP2583733B1 (en) | 2021-05-05 |
JP5734042B2 (ja) | 2015-06-10 |
US20130074691A1 (en) | 2013-03-28 |
JP2015164728A (ja) | 2015-09-17 |
JP5898800B2 (ja) | 2016-04-06 |
EP2583733A4 (en) | 2016-10-05 |
US20150174517A1 (en) | 2015-06-25 |
CN102985153B (zh) | 2015-02-11 |
EP2583733A1 (en) | 2013-04-24 |
US9636616B2 (en) | 2017-05-02 |
KR102241666B1 (ko) | 2021-04-16 |
KR20130024950A (ko) | 2013-03-08 |
US9005334B2 (en) | 2015-04-14 |
JP2012020279A (ja) | 2012-02-02 |
KR20170120211A (ko) | 2017-10-30 |
KR20190042749A (ko) | 2019-04-24 |
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