JP6661098B1 - 積層ポリテトラフルオロエチレン多孔膜及びその製法 - Google Patents
積層ポリテトラフルオロエチレン多孔膜及びその製法 Download PDFInfo
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- 229920001343 polytetrafluoroethylene Polymers 0.000 title claims abstract description 141
- 239000004810 polytetrafluoroethylene Substances 0.000 title claims abstract description 141
- 239000012528 membrane Substances 0.000 title claims abstract description 73
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 13
- -1 polytetrafluoroethylene Polymers 0.000 title claims description 30
- 239000002245 particle Substances 0.000 claims abstract description 38
- 239000003607 modifier Substances 0.000 claims abstract description 4
- 238000001125 extrusion Methods 0.000 claims description 31
- 238000000465 moulding Methods 0.000 claims description 31
- 239000011148 porous material Substances 0.000 claims description 13
- 239000000839 emulsion Substances 0.000 claims description 12
- 238000002844 melting Methods 0.000 claims description 9
- 230000008018 melting Effects 0.000 claims description 9
- 229910052751 metal Inorganic materials 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 7
- 239000004908 Emulsion polymer Substances 0.000 claims description 5
- 238000007720 emulsion polymerization reaction Methods 0.000 claims description 5
- 238000005096 rolling process Methods 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 4
- 229940058401 polytetrafluoroethylene Drugs 0.000 claims 17
- 230000035699 permeability Effects 0.000 abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 19
- 239000003921 oil Substances 0.000 description 14
- 235000019198 oils Nutrition 0.000 description 13
- 239000000843 powder Substances 0.000 description 13
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 10
- 238000005259 measurement Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 8
- 230000007423 decrease Effects 0.000 description 7
- 239000004006 olive oil Substances 0.000 description 5
- 235000008390 olive oil Nutrition 0.000 description 5
- 239000011780 sodium chloride Substances 0.000 description 5
- 239000002904 solvent Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 239000012752 auxiliary agent Substances 0.000 description 3
- 239000004744 fabric Substances 0.000 description 3
- 239000010419 fine particle Substances 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 230000035515 penetration Effects 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- CNPVJWYWYZMPDS-UHFFFAOYSA-N 2-methyldecane Chemical compound CCCCCCCCC(C)C CNPVJWYWYZMPDS-UHFFFAOYSA-N 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 235000012438 extruded product Nutrition 0.000 description 2
- 239000002657 fibrous material Substances 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 210000002374 sebum Anatomy 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 239000004094 surface-active agent Substances 0.000 description 2
- BSYNRYMUTXBXSQ-UHFFFAOYSA-N Aspirin Chemical compound CC(=O)OC1=CC=CC=C1C(O)=O BSYNRYMUTXBXSQ-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 239000000443 aerosol Substances 0.000 description 1
- LXQXZNRPTYVCNG-YPZZEJLDSA-N americium-241 Chemical compound [241Am] LXQXZNRPTYVCNG-YPZZEJLDSA-N 0.000 description 1
- 239000012298 atmosphere Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- UUAGAQFQZIEFAH-UHFFFAOYSA-N chlorotrifluoroethylene Chemical group FC(F)=C(F)Cl UUAGAQFQZIEFAH-UHFFFAOYSA-N 0.000 description 1
- 230000009194 climbing Effects 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000010462 extra virgin olive oil Substances 0.000 description 1
- 235000021010 extra-virgin olive oil Nutrition 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000009998 heat setting Methods 0.000 description 1
- HCDGVLDPFQMKDK-UHFFFAOYSA-N hexafluoropropylene Chemical compound FC(F)=C(F)C(F)(F)F HCDGVLDPFQMKDK-UHFFFAOYSA-N 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
Classifications
-
- 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
- B01D69/12—Composite membranes; Ultra-thin membranes
- B01D69/1213—Laminated layers
-
- 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
- B01D69/12—Composite membranes; Ultra-thin membranes
- B01D69/1216—Three or more layers
-
- 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
-
- 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—Polytetrafluoroethene
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C67/00—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
- B29C67/20—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00 for porous or cellular articles, e.g. of foam plastics, coarse-pored
-
- 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
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
-
- 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
- B32B5/18—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 features of a layer of foamed material
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/24—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof by surface fusion and bonding of particles to form voids, e.g. sintering
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Polymers & Plastics (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
- Laminated Bodies (AREA)
- Molding Of Porous Articles (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
Description
PTFE乳化重合粒子からなるファインパウダーF−106(ダイキン工業株式会社製)に成形助剤として溶剤アイソパーH(エクソンモービルコーポレーション製)を22重量部混合した(以後、この混合物を「成形助剤混入PTFE乳化重合粒子A」と称す)。
積層PTFE多孔膜の重量測定については、積層PTFE多孔膜の中央部を50mm正方形の型で裁断してサンプル5枚を作製し、その1枚ずつの重量を電子天秤(有効桁1000分の1g、アズワン株式会社製アズプロ電子天秤ASP213)で秤量し、その平均値を積層PTFE多孔膜の1枚分の重量とした。
CI=測定試料に供給されたNaCl 0.1μmの粒子数
捕集効率(%)=(CO/CI)×100
PTFE多孔膜の特性としては、圧力損失及び捕集効率が重要であるが、この2つの特性は、一方を上げれば他方が下がる傾向を有しているので、その両立が難しい。圧力損失と捕集効率とのバランスの優劣を評価するための指標としては次式で求められるPF値が用いられる。
その試験結果は以下の表1に示すとおりである。
比較例1として、成形助剤混入PTFE乳化重合粒子Aのみからなる多孔膜を、実施例1と同様の製法でペースト押出、圧延、二軸延伸で多孔膜を作製した。
比較例2として、厚み15μmの比較例1の多孔膜を2枚重ねて厚み30μmの多孔膜を作製した。
実施例1、比較計1及び比較例2について、上記した測定を行ったところ、下記表3の結果となった。
Claims (4)
- 第1層〜第3層の3つの層を含む3層以上の積層体から構成され、
第1層及び第3層は、数平均分子量が300万以上のポリテトラフルオロエチレン乳化重合粒子により作製され、フィブリルとノードとにより形成された微細孔を有するポリテトラフルオロエチレン多孔膜層であり、
第2層は、第1層と第3層との間に位置し、共重合性変性剤を含んだポリテトラフルオロエチレン乳化重合粒子により作製された難フィブリル化の変性ポリテトラフルオロエチレン多孔膜層であって、ノードにより形成され、第1層及び第3層に形成された微細孔よりも大きな孔径を有する変性ポリテトラフルオロエチレン多孔膜層である
ことを特徴とする積層ポリテトラフルオロエチレン多孔膜。 - 第1層と第3層のポリテトラフルオロエチレン多孔膜層の厚みは第2層の変性ポリテトラフルオロエチレン多孔膜層の厚みより小である
ことを特徴とする請求項1に記載の積層ポリテトラフルオロエチレン多孔膜。 - 請求項1に記載の第1層を形成するための成形助剤混入ポリテトラフルオロエチレン乳化重合粒子と、請求項1に記載の第2層を形成するための成形助剤混入変性ポリテトラフルオロエチレン乳化重合粒子と、請求項1に記載の第3層を形成するための成形助剤混入ポリテトラフルオロエチレン乳化重合粒子とを、第1層、第2層、第3層の順序に積層して予備成形体を作製し、
当該予備成形体を押出成形金型に装填し、
装填した前記予備成形体を当該押出成形金型から押し出して押出成形体を作製し、
前記押出成形体を圧延及び乾燥して成形助剤除去フィルムを作製し、
前記成形助剤除去フィルムを押出方向に5倍以上延伸し、
押出方向に延伸した後、押出方向と直交する方向に20倍以上延伸して、延伸膜を作製し、
当該延伸膜をポリテトラフルオロエチレンの融点以上の温度で焼成して請求項1又は2に記載の積層ポリテトラフルオロエチレン多孔膜を製造する
ことを特徴とする積層ポリテトラフルオロエチレン多孔膜の製法。 - 請求項3に記載の成形助剤除去フィルムを作製した後、
当該成形助剤除去フィルムを、2本一対のロールから構成され、一方は金属製ロールであり、他方は金属製の軸芯にゴムを被覆したゴムロールからなるニップロールにより狭圧して高密度未焼成フィルムを作製し、
作製した前記高密度未焼成フィルムを押出方向に5倍以上延伸し、
押出方向に延伸した後、押出方向と直交する方向に20倍以上延伸して、高密度延伸膜を作製し、
当該高密度延伸膜をポリテトラフルオロエチレンの融点以上の温度で焼成して請求項1又は2に記載の積層ポリテトラフルオロエチレン多孔膜を製造する
ことを特徴とする積層ポリテトラフルオロエチレン多孔膜の製法。
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JP2019012368A JP6661098B1 (ja) | 2019-01-28 | 2019-01-28 | 積層ポリテトラフルオロエチレン多孔膜及びその製法 |
PCT/JP2020/000910 WO2020158373A1 (ja) | 2019-01-28 | 2020-01-14 | 積層ポリテトラフルオロエチレン多孔膜及びその製法 |
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Family Cites Families (6)
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JPH078926B2 (ja) * | 1989-12-07 | 1995-02-01 | ダイキン工業株式会社 | ポリテトラフルオロエチレン複層多孔膜の製造方法 |
JPH0798136B2 (ja) * | 1990-02-23 | 1995-10-25 | 三菱レイヨン株式会社 | 多層複合膜及びその製造法 |
JP2002301321A (ja) * | 2001-04-05 | 2002-10-15 | Daikin Ind Ltd | フィルタ濾材、それを用いたフィルタパック及びエアフィルタユニット並びにフィルタ濾材の製造方法 |
JP3672868B2 (ja) * | 2001-12-26 | 2005-07-20 | 日東電工株式会社 | ポリテトラフルオロエチレン多孔質膜複合材の製造方法 |
JP5470137B2 (ja) * | 2010-03-31 | 2014-04-16 | 富士フイルム株式会社 | 結晶性ポリマー微孔性膜及びその製造方法、並びに、該結晶性ポリマー微孔性膜を用いた濾過用フィルター |
TWI639462B (zh) * | 2012-04-20 | 2018-11-01 | Daikin Industries, Ltd. | 以聚四氟乙烯(ptfe)為主成分之組合物、混合粉末及成形用材料 |
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