TWI596145B - Polytetrafluoroethylene black porous film, its manufacturing method, with its breathable membrane and breathable member - Google Patents
Polytetrafluoroethylene black porous film, its manufacturing method, with its breathable membrane and breathable member Download PDFInfo
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- TWI596145B TWI596145B TW102120501A TW102120501A TWI596145B TW I596145 B TWI596145 B TW I596145B TW 102120501 A TW102120501 A TW 102120501A TW 102120501 A TW102120501 A TW 102120501A TW I596145 B TWI596145 B TW I596145B
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- 229920001343 polytetrafluoroethylene Polymers 0.000 title claims description 209
- 239000004810 polytetrafluoroethylene Substances 0.000 title claims description 209
- 239000012528 membrane Substances 0.000 title claims description 203
- -1 Polytetrafluoroethylene Polymers 0.000 title claims description 15
- 238000004519 manufacturing process Methods 0.000 title claims description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 39
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 claims description 33
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims description 33
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 25
- 238000004043 dyeing Methods 0.000 claims description 16
- 239000005871 repellent Substances 0.000 claims description 16
- 238000010438 heat treatment Methods 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 9
- 239000000428 dust Substances 0.000 claims description 7
- 239000007789 gas Substances 0.000 description 109
- 239000007788 liquid Substances 0.000 description 24
- 238000005406 washing Methods 0.000 description 21
- 239000011148 porous material Substances 0.000 description 18
- 230000035699 permeability Effects 0.000 description 13
- 239000002904 solvent Substances 0.000 description 11
- 238000005562 fading Methods 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 9
- 239000010410 layer Substances 0.000 description 9
- 238000002844 melting Methods 0.000 description 8
- 230000008018 melting Effects 0.000 description 8
- 230000005540 biological transmission Effects 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 238000004040 coloring Methods 0.000 description 3
- 238000003475 lamination Methods 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- OZAIFHULBGXAKX-UHFFFAOYSA-N 2-(2-cyanopropan-2-yldiazenyl)-2-methylpropanenitrile Chemical compound N#CC(C)(C)N=NC(C)(C)C#N OZAIFHULBGXAKX-UHFFFAOYSA-N 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- SNRUBQQJIBEYMU-UHFFFAOYSA-N dodecane Chemical compound CCCCCCCCCCCC SNRUBQQJIBEYMU-UHFFFAOYSA-N 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 239000003350 kerosene Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 125000001791 phenazinyl group Chemical group C1(=CC=CC2=NC3=CC=CC=C3N=C12)* 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- FWLHAQYOFMQTHQ-UHFFFAOYSA-N 2-N-[8-[[8-(4-aminoanilino)-10-phenylphenazin-10-ium-2-yl]amino]-10-phenylphenazin-10-ium-2-yl]-8-N,10-diphenylphenazin-10-ium-2,8-diamine hydroxy-oxido-dioxochromium Chemical compound O[Cr]([O-])(=O)=O.O[Cr]([O-])(=O)=O.O[Cr]([O-])(=O)=O.Nc1ccc(Nc2ccc3nc4ccc(Nc5ccc6nc7ccc(Nc8ccc9nc%10ccc(Nc%11ccccc%11)cc%10[n+](-c%10ccccc%10)c9c8)cc7[n+](-c7ccccc7)c6c5)cc4[n+](-c4ccccc4)c3c2)cc1 FWLHAQYOFMQTHQ-UHFFFAOYSA-N 0.000 description 1
- BCHZICNRHXRCHY-UHFFFAOYSA-N 2h-oxazine Chemical compound N1OC=CC=C1 BCHZICNRHXRCHY-UHFFFAOYSA-N 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- JUJWROOIHBZHMG-UHFFFAOYSA-N Pyridine Chemical compound C1=CC=NC=C1 JUJWROOIHBZHMG-UHFFFAOYSA-N 0.000 description 1
- 239000004699 Ultra-high molecular weight polyethylene Substances 0.000 description 1
- 238000012644 addition polymerization Methods 0.000 description 1
- 238000003556 assay Methods 0.000 description 1
- 239000007767 bonding agent Substances 0.000 description 1
- 210000004027 cell Anatomy 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000003085 diluting agent Substances 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 125000003709 fluoroalkyl group Chemical group 0.000 description 1
- 229920002313 fluoropolymer Polymers 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 210000001724 microfibril Anatomy 0.000 description 1
- 230000000116 mitigating effect Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 125000005010 perfluoroalkyl group Chemical group 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000767 polyaniline Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 239000003505 polymerization initiator Substances 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229920000785 ultra high molecular weight polyethylene Polymers 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 239000002759 woven fabric Substances 0.000 description 1
Classifications
-
- 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
- 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
- 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
- B01D67/00—Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
- B01D67/0002—Organic membrane manufacture
- B01D67/002—Organic membrane manufacture from melts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D67/00—Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
- B01D67/0002—Organic membrane manufacture
- B01D67/0023—Organic membrane manufacture by inducing porosity into non porous precursor membranes
- B01D67/0025—Organic membrane manufacture by inducing porosity into non porous precursor membranes by mechanical treatment, e.g. pore-stretching
- B01D67/0027—Organic membrane manufacture by inducing porosity into non porous precursor membranes by mechanical treatment, e.g. pore-stretching by stretching
-
- 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
-
- 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
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/005—Shaping by stretching, e.g. drawing through a die; Apparatus therefor characterised by the choice of materials
-
- 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
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
- B29C55/10—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial
- B29C55/12—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial
- B29C55/14—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial successively
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L27/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers
- C08L27/02—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L27/12—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
- C08L27/18—Homopolymers or copolymers or tetrafluoroethene
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
- D06P3/00—Special processes of dyeing or printing textiles, or dyeing leather, furs, or solid macromolecular substances in any form, classified according to the material treated
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
- D06P7/00—Dyeing or printing processes combined with mechanical treatment
- D06P7/005—Dyeing combined with texturising or drawing treatments
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2325/00—Details relating to properties of membranes
- B01D2325/38—Hydrophobic membranes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2027/00—Use of polyvinylhalogenides or derivatives thereof as moulding material
- B29K2027/12—Use of polyvinylhalogenides or derivatives thereof as moulding material containing fluorine
- B29K2027/18—PTFE, i.e. polytetrafluorethene, e.g. ePTFE, i.e. expanded polytetrafluorethene
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/0005—Condition, form or state of moulded material or of the material to be shaped containing compounding ingredients
- B29K2105/0032—Pigments, colouring agents or opacifiyng agents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/04—Condition, form or state of moulded material or of the material to be shaped cellular or porous
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
- B29K2995/0018—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular optical properties, e.g. fluorescent or phosphorescent
- B29K2995/002—Coloured
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2007/00—Flat articles, e.g. films or sheets
- B29L2007/008—Wide strips, e.g. films, webs
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Textile Engineering (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Coloring (AREA)
- Filtering Materials (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Description
本發明係有關於一種黑色之聚四氟乙烯多孔質膜(聚四氟乙烯黑色多孔質膜),其與先前相比,可抑制因熱及/或光導致之褪色。又,本發明係有關於使用有該多孔質膜之透氣膜及透氣構件。
近年來,一般而言,行動電話、個人電腦、電子記事本、數位相機、遊戲主機等之電子機器係具備聲音機能。該等機器雖希望有防水構造,但於具備聲音機能之電子機器之框體而言,通常於對應喇叭、麥克風、蜂鳴器等發音部及受音部之位置設置有開口,且必須經由該開口傳遞聲音,因此難以一面確保聲音機能一面製成防水構造。至今,藉由以防水透音膜封住設於框體之開口,謀求於該開口之透音性與防水性之兼顧。防水透音膜係由難以阻礙聲音透過之材料所構成之薄膜,且藉由使該膜朝開口配置,可一面獲得良好之透音性,一面抑制水侵入至框體內部。防水透音膜較佳為一面遮蔽水,一面使氣體通過之透氣膜。更具體而言,較佳為具有聚四氟乙烯(PTFE)多孔質膜之透氣膜(參照專利文獻1)。
然而,PTFE多孔質膜原來之顏色為白色。防水透音膜係以封住開口之方式配置於框體之內部,但白色之膜易於顯眼。若膜顯眼,則成為電子機器之設計上之阻害,且因刺激使用者之好奇心,容易產生因文具等之刺穿導致之膜的損傷。因此,要求有於框體配置時難以顯眼、黑色
之PTFE多孔質膜(PTFE黑色多孔質膜)。
PTFE黑色多孔質膜有揭示於專利文獻2。又,於專利文獻3記載有並非黑色,但著色成灰色或粉紅色之PTFE多孔質膜。
再者,具有PTFE多孔質膜之透氣膜除了防水透音膜之外,亦可用作一面遮蔽水及/或粉塵,一面使氣體通過之防水透氣膜或防塵透氣膜。
[專利文獻1]日本特開2004-83811號公報
[專利文獻2]日本特開平8-27304號公報
[專利文獻3]日本特開平7-289865號公報
先前之著色PTFE多孔質膜中,因暴露至高溫氣氛或光之照射(典型而言為太陽光之照射),容易引起著色之褪色。
本發明之目的在於提供一種PTFE黑色多孔質膜,其較先前之著色PTFE多孔質膜更可抑制因熱及/或光之褪色,耐褪色性優異。
本發明係提供一種PTFE黑色多孔質膜,其染色成黑色,依據JIS L1015(漢特法)測定之主面之白色度為18.0~23.0%,且以350℃ 1分鐘加熱後,該主面之白色度為18.0~25.0%。
本發明提供一種PTFE黑色多孔質膜之製造方法,係製造該PTFE黑色多孔質膜之方法,其包含以下步驟:成形步驟,自包含PTFE之混合物成形片狀成形體之步驟、第1延伸步驟,將該片狀成形體於第1方向延伸,形成多孔質膜之步
驟、染色步驟,將於該第1方向經延伸之該片狀成形體染色成黑色之步驟、第2延伸步驟,於與該第1方向相異之第2方向延伸,形成黑色多孔質膜之步驟。
本發明提供一種透氣膜,其係一面遮蔽水及/或粉塵,一面使氣體通過者,且具有該PTFE黑色多孔質膜、與透氣性支撐材之積層構造,且至少於一主面露出該PTFE黑色多孔質膜。
本發明提供一種透氣構件,其具備該聚四氟乙烯黑色多孔質膜或該透氣膜、與支撐該聚四氟乙烯黑色多孔質膜或該透氣膜之支撐構件。
根據本發明,藉由主面之白色度為18.0~23.0%,且以350℃ 1分鐘之加熱後製成主面之白色度為18.0~25.0%之PTFE黑色多孔質膜,可提供一種PTFE黑色多孔質膜,其較先前之著色PTFE多孔質膜更可抑制因熱及/或光之褪色,耐褪色性優異。
1、2、3、4‧‧‧透氣膜
5‧‧‧透氣構件
11‧‧‧PTFE黑色多孔質膜
12‧‧‧透氣性支撐材
13‧‧‧PTFE多孔質膜
14‧‧‧支撐構件
圖1係示意性地表示本發明之透氣膜之一例之剖面圖。
圖2係示意性地表示本發明之透氣膜之其他一例之剖面圖。
圖3係示意性地表示本發明之透氣膜之又其他一例之剖面圖。
圖4係示意性地表示本發明之透氣膜之進而其他一例之剖面圖。
圖5係示意性地表示本發明之透氣構件之一例之剖面圖。
本發明之PTFE黑色多孔質膜係染色成黑色之染色PTFE多孔質膜,其主面之白色度依據JIS L1015所測定白色度為18.0~23.0%,且以350℃ 1分鐘加熱後,主面之白色度為18.0~25.0%。利用漢特式測色色差計測定明度L、色相a及彩度b,並由下式求出該白色度W。
W=100-sqr〔(100-L)2+(a2+b2)〕
白色度較高表示更白,若成為0則意指完全為黑色。如此之黑色多孔質膜例如可由如下方法形成:將PTFE多孔質膜浸漬於包含染料之染色液、或將包含染料之染色液塗佈於PTFE多孔質膜後,藉由乾燥等將染色液所包含之染料的溶劑除去而形成。浸漬及塗佈之方法並無特別限定。染料為可進行如下染色步驟者:將未經任何著色處理之白色PTFE多孔質膜以其主面之白色度為18.0~23.0%,且以350℃ 1分鐘加熱後,主面之白色度成為18.0~25.0%之方式進行染色,作為一例,較佳為具有吩嗪(phenazine)環之吖嗪(azine)系染料等。染料較佳為熔點高於PTFE者。染料較佳之熔點例如為高於超過PTFE之熔點之溫度即360℃,進而高於400℃。染色液通常包含染料、與稀釋該染料而使染色操作性提高之溶劑。PTFE多孔質膜於化學性上較為穩定,因此溶劑之種類並無特別限定,可根據染料之種類及染色之操作性等適當選擇。染色液之染料濃度必需可將未經任何著色處理之白色PTFE多孔質膜以其主面之白色度為18.0~23.0%,且以350℃ 1分鐘加熱後,主面之白色度成為18.0~25.0%之方式進行染色,通常為5重量%以上。
染色成黑色之PTFE多孔質膜可藉由公知之方法獲得。例如可藉由將PTFE微粉與成形助劑之混合物擠出成形及壓延而製成片狀,自此除去成形助劑製成成形體之片材後,所獲得之片材進而進行延伸而形成。自此種方式製作之PTFE多孔質膜所獲得之本發明之PTFE黑色多孔質膜具有多孔質構造,該多孔質構造將形成無數之PTFE之微細纖維(fibrillar)間之空隙作為細孔。此多孔質構造中之平均孔徑及空孔率可藉由變更片材之延伸條件進行調整,其具體值只要視本發明之PTFE黑色多孔質膜之用途進行選擇即可。
本發明之PTFE黑色多孔質膜亦可進行撥液處理,於此情形,成為撥水及撥油性能優異之多孔質膜。此種多孔質膜於作為以防水透音膜為首之透氣膜之用途較佳。撥液處理可於PTFE多孔質膜染成黑色後藉由公知之方法實施。於撥液處理所使用之撥液劑並無特別限定,典型為包含具有全氟烷基之高分子之材料。
本發明之透氣膜之構成只要具有本發明之PTFE黑色多孔質膜,則無特別限定。
圖1係本發明之透氣膜之一例。圖1之透氣膜1由本發明之PTFE黑色多孔質膜11構成。透氣膜1係基於PTFE黑色多孔質膜11具有之上述多孔質構造,而具有一面遮蔽水及/或粉塵,一面使氣體通過之特性。透氣膜1為黑色,例如配置於電子機器之框體之開口時,與白色之PTFE多孔質膜相比亦較不顯眼。又,透氣膜1為PTFE黑色多孔質膜11之單層構造,因此面密度可抑制得較低。透氣膜之面密度越低,於該膜之聲響通過
損失變小,因此透音性提高。因此透氣膜1係配置於具有發音部及/或受音部之電子機器中之框體的開口,尤其作為用以確保該開口之透音性與防水性之防水透音膜之用途較佳。
當然地透氣膜1於防水透音膜以外之用途,例如作為利用一面遮蔽水及/或粉塵,一面使氣體通過之特性的防水透氣膜或防塵透氣膜之用途亦佳。防水透氣膜(防塵透氣膜)配置於例如燈具、馬達、感測器、ECU(Electronic Control Unit)等之車輛用電裝零件之框體,被用以確保框體內外之透氣之同時,緩和因溫度變化導致之框體內的壓力變化。
於透氣膜1之PTFE黑色多孔質膜11之平均孔徑一般為0.01~20μm,較佳為0.05~5μm。將透氣膜1作為防水透音膜使用之情形時,自實現兼顧防水性與透音性之觀點而言,PTFE黑色多孔質膜11之平均孔徑較佳為1μm以下,更佳為0.7μm以下,進而較佳為0.5μm以下。平均孔徑之下限並無特別限定,但例如為0.1μm。PTFE多孔質膜之平均孔徑係可依據ASTM F316-86之規定而測定,例如於PTFE多孔質膜之測定可利用依據該規定之可自動測定之市售測定裝置(可自美國Porous Material Inc.得到之Perm-Porometer)。
將透氣膜1作為防水透音膜使用之情形,自實現兼顧作為膜之物理強度與透音性之觀點而言,透氣膜1之面密度較佳為1~10g/m2,更佳為2~8g/m2,進而較佳為3~6g/m2。使用透氣膜作為未被要求良好透音性之防水透氣膜或防塵透氣膜之情形時,透氣膜1之面密度並無特別限制。
PTFE黑色多孔質膜11亦可進行撥液處理,於此情形,透氣膜1之撥水及撥油性能提高。關於使用經撥液處理之PTFE黑色多孔質膜11
之效果,於以下之圖2、3所示之透氣膜2、3、4亦相同。
圖2係為本發明之透氣膜之其他一例。圖2之透氣膜2具有本發明之PTFE黑色多孔質膜11、與支撐該多孔質膜11之透氣性支撐材12之積層構造。透氣膜2基於PTFE黑色多孔質膜11具有之上述多孔質構造,而具有一面遮蔽水及/或粉塵,一面使氣體通過之特性。PTFE黑色多孔質膜11於透氣膜2露出,且例如將透氣膜2配置於電子機器之框體之開口時,若PTFE黑色多孔質膜11面對框體之外部,則與白色之PTFE多孔質膜相比亦較不顯眼。透氣膜2之用途並無特別限定,可較佳地使用於防水透音膜、防水透氣膜、防塵透氣膜等。
透氣性支撐材12之材料或構造並無特別限定,但較佳為透氣性較PTFE黑色多孔質膜更優異者。透氣性支撐材12例如為由金屬或樹脂或該等之複合材料構成之織布、不織布、網目、網、海綿、發泡體、多孔體。樹脂例如為聚烯烴、聚酯、聚醯胺、聚醯亞胺、聚芳醯胺、氟樹脂、超高分子量聚乙烯。於積層PTFE黑色多孔質膜11與透氣性支撐材12時,亦可使用熱積層、加熱熔接、超音波熔接等各種接合方法接合兩者。
透氣膜2亦可具有2層以上之PTFE黑色多孔質膜11及/或2層以上之透氣膜支撐材12,於此情形,並無特別限定其積層順序。其中,為了於配置於電子機器之框體之開口時與白色PTFE多孔質膜相比較不顯眼,如圖2所示,較佳為於至少一主面露出PTFE黑色多孔質膜11。換言之,本發明之透氣膜亦可具有本發明之PTFE黑色多孔質膜與透氣性支撐材之積層構造,於此情形,較佳為於至少一主面露出PTFE黑色多孔質膜11。
透氣膜2之PTFE黑色多孔質膜11之平均孔徑係如圖1所
示之透氣膜1之說明中之例示。關於使用透氣膜2作為防水透音膜之情形之PTFE黑色多孔質膜的平均孔徑,亦於如圖1所示之透氣膜1之說明中之例示。透氣膜2具有2層以上之PTFE黑色多孔質膜11之情形時,只要至少1層之PTFE黑色多孔質膜11具有例示之平均孔徑即可。
使用透氣膜2作為防水透音膜之情形,自實現兼顧作為膜之物理強度與透音性之觀點而言,透氣膜2之面密度(包含PTFE黑色多孔質膜11及透氣性支撐材12之複數層之合計)較佳為1~10g/m2,更佳為2~8g/m2,進而較佳為3~6g/m2。
圖3為本發明之透氣膜之其他一例。圖3之透氣膜3具有本發明之PTFE黑色多孔質膜11、及與PTFE黑色多孔質膜11不同之其他PTFE多孔質膜13之積層構造。PTFE多孔質膜13可為無著色(即白色)亦可著色成任意顏色(例如黑色),當以主面之白色度為18.0~23.0%以上,且於350℃ 1分鐘之加熱後,主面之白色度成為18.0~25.0%之方式染色成黑色(亦即本發明之PTFE黑色多孔質膜),主面之白色度亦可為23.0%以上。PTFE多孔質膜13與PTFE黑色多孔質膜11同樣地,具有多孔質構造,該多孔質構造將形成無數之PTFE之微細纖維(fibrillar)間之空隙作為細孔。透氣膜3基於選自PTFE黑色多孔質膜11及PTFE多孔質膜13至少一種之PTFE多孔質膜所具有之上述多孔質構造,而具有一面遮蔽水及/或粉塵,一面使氣體通過之特性。
黑色之多孔質膜11於透氣膜3露出,且例如將透氣膜3配置於電子機器之框體之開口時,若PTFE黑色多孔質膜11面對框體之外部,則與白色之PTFE多孔質膜相比較不顯眼。即,本發明之透氣膜亦可具有本
發明之PTFE黑色多孔質膜11與異於其之其他PTFE多孔質膜13之積層構造,於其情形,較佳為於至少一主面露出PTFE黑色多孔質膜。
透氣膜3亦可具有2層以上之PTFE黑色多孔質膜11及/或2層以上之PTFE多孔質膜13,於此情形,並未特別限定積層順序。
透氣膜3之用途並無特別限定,可較佳地使用於防水透音膜、防水透氣膜、防塵透氣膜。
於透氣膜3,選自PTFE黑色多孔質膜11及PTFE多孔質膜13至少1個之PTFE多孔質膜之平均孔徑係如圖1所示之透氣膜1之說明中之例示。關於使用透氣膜3作為防水透音膜之情形亦同樣地,選自PTFE黑色多孔質膜11及PTFE多孔質膜13至少1個之PTFE多孔質膜之平均孔徑,於如圖1所示之透氣膜1之說明中之例示。透氣膜3具有2層以上之PTFE黑色多孔質膜及/或PTFE多孔質膜13之情形時,只要至少1層之PTFE黑色多孔質膜11或PTFE多孔質膜13具有例示之平均孔徑即可。PTFE黑色多孔質膜11之平均孔徑、與PTFE多孔質膜13可相同亦可不同。
使用透氣膜3作為防水透音膜之情形,自實現兼顧作為膜之物理強度與透音性之觀點而言,透氣膜3之面密度(包含PTFE黑色多孔質膜11及PTFE多孔質膜13之複數層之合計)較佳為1~10g/m2,更佳為2~8g/m2,進而較佳為3~6g/m2。
圖4為本發明之透氣膜之其他一例。圖4之透氣膜4係於在圖3所示之透氣膜3進而具有透氣性支撐材12。於透氣膜4露出黑色之多孔質膜11。透氣性支撐材12係如圖2所示之透氣膜2之說明中之例示。
本發明之透氣膜亦可具有除了PTFE黑色多孔質膜11、透氣
性支撐材12、PTFE多孔質膜13以外之任意構件。此時,較佳為PTFE黑色多孔質膜11於本發明之透氣膜之至少一主面露出。
本發明之透氣構件之一例如圖5所示。圖5所示之透氣構件5係具備本發明之透氣膜1。透氣膜1為圓板狀,且於周緣部安裝有環狀之支撐構件14。根據所設置之環狀之支撐構件14之形態,可補強透氣膜1,且其之處理變得容易。又,因支撐構件14安裝至電氣製品之框體,提高透氣膜1之向框體之安裝操作性。於此透氣構件亦可使用PTFE黑色多孔質膜11代替透氣膜1。
支撐構件之形狀只要可支撐本發明之透氣膜則並無特別限定。支撐構件之材質亦無特別限定,典型為由樹脂或金屬或該等之複合材料構成。
透氣膜1與支撐構件14之接著方法並無特別限定,例如可應用藉由加熱熔接、超音波熔接、接著劑之接著、雙面帶之接著等方法。
一開始表示於本實施例製作之PTFE黑色多孔質膜以及無著色之PTFE多孔質膜之評價方法。
PTFE多孔質膜之白色度係依據JIS L1015(漢特法),使用色差計進行評價。
PTFE多孔質膜之透氣度係依據JIS P8117(葛萊爾法)進行評價。
PTFE多孔質膜之耐水壓係使用JIS L1092記載之耐水度試驗機(高水壓法)而求出。但是以JIS L1092規定之面積則膜明顯變形,故於膜之加壓面之反側設置不銹鋼網(開口徑2mm),於變形經抑制之狀態下進行測定。
以影印紙為下之方式將影印紙與PTFE多孔質膜加以積層,使用滴管於PTFE多孔質膜滴下1滴燈油後,放置1分鐘。其後,取去多孔質膜並確認影印紙之狀態,影印紙以燈油浸潤之情形設為無PTFE多孔質膜之撥液性,未浸潤之情形設為有撥液性。
均勻混合PTFE微粉(DAIKIN工業製造,F104)100重量份、與作為成形助劑之十二烷(Japan Energy製造)20重量份,利用氣缸將所獲得之混合物壓縮後撞擊擠出(ram extrusion)而製成片狀之混合物。繼而,利用一對金屬輥將所獲得之混合物壓延至厚度0.2mm,進而藉由150℃之加熱將成形助劑乾燥除去,獲得PTFE之片狀成形體。繼而,將所獲得之片狀成形體於其長度方向(壓延方向)以延伸溫度260℃、延伸倍率10倍進行延伸。
接著,將如上所製作之PTFE多孔質膜於混合黑色染料(Orient Chemical Industries製造,SP BLACK 91-L,乙醇稀釋溶液25重量%)20重量份、作為染料溶劑之乙醇(純度95%)80重量份之染色液浸漬數秒後,整體加熱至100℃將溶劑乾燥除去,獲得染色成黑色之PTFE多孔質膜。黑色染料(SP BLACK 91-L)係以包含作為黑色成份之「Solvent Black7(別名:nigrosine,苯胺黑)」之混合物形式而販售。「Solvent Black7」為具有吩
嗪環之吖嗪系染料。「Solvent Black7」之熔點為450℃。繼而,將如上所製作之PTFE黑色多孔質膜於撥液劑浸漬數秒後,整體加熱至100℃將溶劑乾燥除去,獲得經撥液處理之PTFE黑色多孔質膜。撥液劑藉以下順序調配。將具有以CH2=CHCOOCH2CH2C6F13表示之直鏈狀氟烷基之化合物100g、作為聚合起始劑之偶氮雙異丁腈(azobisisobutyronitrile)0.1g、溶劑(信越化學公司製之「FS Thinner」)300g投入裝置有氮導入管、溫度計、攪拌機之燒瓶中,一面於70℃導入氮氣攪拌,一面進行16小時之加成聚合,獲得含氟之聚合物80g。該聚合物之數量平均分子量為100000。利用稀釋劑(信越化學公司製之「FS Thinner」)以成為3.0%之方式將該含氟聚合物稀釋而調配撥液劑。
繼而,於寬度方向以延伸溫度150℃、延伸倍率10倍進行延伸,進而將整體於超過PTFE熔點的溫度即360℃進行燒成,獲得PTFE多孔質膜。所獲得之PTFE多孔質膜之平均孔徑為0.5μm、面密度為6g/m2。如表1所示,所獲得之黑色PTFE多孔質膜之白色度為20.0%、透氣度為1.0秒/100mL、耐水壓為150kPa、撥液性為「有」。再者,因PTFE黑色多孔質膜即便以400℃加熱亦不褪色,故PTFE黑色多孔質膜於360℃燒成亦不褪色。
於實施例1所製作之PTFE黑色多孔質膜以350℃ 1分鐘或5分鐘進行加熱。於加熱時,以各多孔質膜不收縮之方式固定於金屬框而進行。如表2所示,以350℃ 1分鐘之加熱後之PTFE黑色多孔質膜之主面之白色度為21.0%、以350℃ 5分鐘之加熱後之PTFE黑色多孔質膜之主面之白色度為21.0%。
於實施例1製作之PTFE黑色多孔質膜進行以醇類之1分鐘之浸漬洗淨。醇類係使用甲醇、乙醇、IPA(異丙醇)及MEK(甲基乙基酮)。如表3所示,甲醇洗淨後之PTFE黑色多孔質膜之主面之白色度為23.8%,乙醇洗淨後之PTFE黑色多孔質膜之主面之白色度為23.5%,IPA洗淨後之PTFE黑色多孔質膜之主面之白色度為21.3%,MEK洗淨後之PTFE黑色多孔質膜之主面之白色度為22.9%。再者,醇類亦可為甲醇、乙醇、IPA(異丙醇)及MEK(甲基乙基酮)之混合液。
染料液之處理濃度設為3.0重量%以外以與實施例1相同之方式進行,獲得經撥液處理之PTFE黑色多孔質膜。如表1所示,所獲得之黑色PTFE多孔質膜之白色度為22.8%、透氣度為1.1秒/100mL、耐水壓為155kPa、撥液性為「有」。如表2所示,以350℃ 1分鐘之加熱後之PTFE黑色多孔質膜之主面之白色度為23.1%、以350℃ 5分鐘之加熱後之PTFE黑色多孔質膜之主面之白色度為23.2%。繼而,於實施例2製作之PTFE黑色多孔質膜進行以醇類之1分鐘之浸漬洗淨。如表3所示,甲醇洗淨後之PTFE黑色多孔質
膜之主面之白色度為24.1%,乙醇洗淨後之PTFE黑色多孔質膜之主面之白色度為24.8%,IPA洗淨後之PTFE黑色多孔質膜之主面之白色度為22.9%,MEK洗淨後之PTFE黑色多孔質膜之主面之白色度為23.8%。
染料液之處理濃度設為8.0重量%以外以與實施例1相同之方式進行,獲得經撥液處理之PTFE黑色多孔質膜。如表1所示,所獲得之黑色PTFE多孔質膜之白色度為18.1%、透氣度為1.0秒/100mL、耐水壓為140kPa、撥液性為「有」。如表2所示,以350℃ 1分鐘之加熱後之PTFE黑色多孔質膜之主面之白色度為18.5%、以350℃ 5分鐘之加熱後之PTFE黑色多孔質膜之主面之白色度為18.5%。繼而,於實施例3製作之PTFE黑色多孔質膜進行以醇類之1分鐘之浸漬洗淨。如表3所示,甲醇洗淨後之PTFE黑色多孔質膜之主面之白色度為18.7%,乙醇洗淨後之PTFE黑色多孔質膜之主面之白色度為18.4%,IPA洗淨後之PTFE黑色多孔質膜之主面之白色度為18.2%,MEK洗淨後之PTFE黑色多孔質膜之主面之白色度為18.8%。
染料液之處理濃度設為0.5重量%,進而進行於寬度方向之延伸及燒成後之黑色之染色及於撥液劑之處理,除此以外以與實施例1相同之方式進行,獲得經撥液處理之PTFE黑色多孔質膜。如表1所示,所獲得之PTFE黑色多孔質膜之白色度為19.2%、透氣度為1.1秒/100mL、耐水壓為150kPa、撥液性為「有」。如表2所示,以350℃ 1分鐘之加熱後之PTFE黑色多孔質膜之主面之白色度為19.3%、以350℃ 5分鐘之加熱後之PTFE黑色多孔質膜之主面之白色度為20.1%。繼而,於實施例4製作之PTFE黑色多孔質膜進
行以醇類之1分鐘之浸漬洗淨。如表3所示,甲醇洗淨後之PTFE黑色多孔質膜之主面之白色度為62.1%,乙醇洗淨後之PTFE黑色多孔質膜之主面之白色度為60.1%,IPA洗淨後之PTFE黑色多孔質膜之主面之白色度為52.5%,MEK洗淨後之PTFE黑色多孔質膜之主面之白色度為61.1%。
染料液之黑色染料設為Orient Chemical Industries製造之「VALIFAST BLACK 3810」以外與實施例1相同之方式進行,獲得經撥液處理之PTFE黑色多孔質膜。「VALIFAST BLACK 3810」係偶氮系鉻之含金染料(別名:偶氮化合物鉻錯合體)。「VALIFAST BLACK 3810」之熔點為359℃,且相較於實施例1~4使用之「Solvent Black7」之熔點之450℃,低100℃左右。如表1所示,所獲得之黑色PTFE多孔質膜之白色度為52.1%、透氣度為1.1秒/100mL、耐水壓為140kPa、撥液性為「有」。如表2所示,以350℃ 1分鐘之加熱後之PTFE黑色多孔質膜之主面之白色度為57.7%、以350℃ 5分鐘之加熱後之PTFE黑色多孔質膜之主面之白色度為62.5%。繼而,於比較例1製作之PTFE黑色多孔質膜進行以醇類之1分鐘之浸漬洗淨。如表3所示,甲醇洗淨後之PTFE黑色多孔質膜之主面之白色度為63.3%,乙醇洗淨後之PTFE黑色多孔質膜之主面之白色度為62.2%,IPA洗淨後之PTFE黑色多孔質膜之主面之白色度為63.9%,MEK洗淨後之PTFE黑色多孔質膜之主面之白色度為62.0%。
染料液之黑色染料設為Orient Chemical Industries製造之「VALIFAST BLACK 3810」,染料液之處理濃度設為0.5重量%,進而進行於寬度方向之
延伸及燒成後之黑色之染色及於撥液劑之處理,除此以外以與實施例1相同之方式進行,獲得經撥液處理之PTFE黑色多孔質膜。如表1所示,所獲得之黑色PTFE多孔質膜之白色度為21.4%、透氣度為1.2秒/100mL、耐水壓為150kPa、撥液性為「有」。如表2所示,以350℃ 1分鐘之加熱後之PTFE黑色多孔質膜之主面之白色度為40.3%、以350℃ 5分鐘之加熱後之PTFE黑色多孔質膜之主面之白色度為62.8%。繼而,於比較例2製作之PTFE黑色多孔質膜進行以醇類之1分鐘之浸漬洗淨。如表3所示,甲醇洗淨後之PTFE黑色多孔質膜之主面之白色度為63.2%,乙醇洗淨後之PTFE黑色多孔質膜之主面之白色度為63.5%,IPA洗淨後之PTFE黑色多孔質膜之主面之白色度為63.1%,MEK洗淨後之PTFE黑色多孔質膜之主面之白色度為62.4%。
如表1所示,於實施例1~4及比較例1~2製作之PTFE黑色多孔質膜之特性除了白色度以外,互相幾乎無差別。如表2所示,於比較例1、2製作之PTFE黑色多孔質膜因加熱而褪色,但於實施例1~4製作之PTFE黑色多孔質膜無褪色。如表3所示,於比較例1、2及實施例4製作之PTFE黑色多孔質膜因醇而褪色,但於實施例1~3製作之PTFE黑色多孔質膜無褪色。如表2、3所示,於比較例1、2製作之PTFE黑色多孔質膜因350℃加熱而褪色,且於比較例1、2及實施例4製作之PTFE黑色多孔質膜因醇而褪色。然而,於實施例1~3製作之PTFE黑色多孔質膜亦不因350℃加熱、醇而褪色。
於實施例1~4中不因350℃加熱而褪色之理由,本發明人等推定其原因在於染料之耐熱性高。於實施例1~3中不因醇而褪色之理由,本發明人等推定為以下之理由:因僅進行黑色處理,黑色染料固定於PTFE
多孔質膜之纖維之周圍。認為藉由於延伸前進行黑色處理,染料附著於PTFE多孔質膜,於延伸後之燒成步驟,因為PTFE多孔質膜加熱至熔點以上,並經熔融而染料徹底固定至PTFE多孔質膜之纖維內部。因醇類無法浸透PTFE,故藉由黑色染料固定至PTFE多孔質膜之纖維內部,可防止因醇類之褪色。
本發明之PTFE黑色多孔質膜可用於與先前之PTFE多孔質膜相同之用途,例如防水透音膜、防水透氣膜、防塵透氣膜。
1‧‧‧透氣膜
11‧‧‧PTFE黑色多孔質膜
Claims (6)
- 一種聚四氟乙烯黑色多孔質膜,其染色成黑色依據JIS L1015(漢特法)測定之主面之白色度為18.0~23.0%,且以350℃ 1分鐘加熱後,該主面之白色度為18.0~25.0%。
- 如申請專利範圍第1項之聚四氟乙烯黑色多孔質膜,於甲醇、乙醇、異丙醇及甲基乙基酮中之任一者浸漬1分鐘而洗淨後,該主面之白色度為18.0~25.0%。
- 一種聚四氟乙烯黑色多孔質膜之製造方法,其係製造申請專利範圍第1項之聚四氟乙烯黑色多孔質膜之方法,且包含如下步驟:成形步驟,自包含聚四氟乙烯之混合物成形片狀成形體之步驟、第1延伸步驟,將該片狀成形體於第1方向延伸,形成多孔質膜之步驟、染色步驟,將於該第1方向經延伸之該片狀成形體染色成黑色之步驟、第2延伸步驟,於與該第1方向相異之第2方向延伸,形成黑色多孔質膜之步驟。
- 如申請專利範圍第3項之聚四氟乙烯黑色多孔質膜之製造方法,進而包含於該第2延伸步驟後進行、對該聚四氟乙烯黑色多孔質膜進行撥液處理之撥液步驟。
- 一種透氣膜,其係一面遮蔽水及/或粉塵,一面使氣體通過者,且具有申請專利範圍第1項之聚四氟乙烯黑色多孔質膜與透氣性支撐材之積層構造,於至少一主面露出該聚四氟乙烯黑色多孔質膜。
- 一種透氣構件,其具備申請專利範圍第1項之聚四氟乙烯黑色多孔質膜或申請專利範圍第5項之透氣膜、與支撐該聚四氟乙烯黑色多孔質膜或該透氣膜之支撐構件。
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