JPWO2018117055A1 - ポリテトラフルオロエチレン多孔質膜とこれを用いた防水通気膜及び防水通気部材 - Google Patents
ポリテトラフルオロエチレン多孔質膜とこれを用いた防水通気膜及び防水通気部材 Download PDFInfo
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- 239000012528 membrane Substances 0.000 title claims abstract description 236
- 229920001343 polytetrafluoroethylene Polymers 0.000 title claims abstract description 221
- 239000004810 polytetrafluoroethylene Substances 0.000 title claims abstract description 221
- -1 Polytetrafluoroethylene Polymers 0.000 title claims abstract description 17
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- B01D71/36—Polytetrafluoroethene
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Abstract
Description
未焼成のPTFEシートを、PTFEの融点以上の延伸温度、及び1.0m/分以下の延伸線速度の延伸条件にて、所定の方向に延伸し(延伸A);
延伸Aにより延伸したシートを上記所定の方向とは異なる方向へさらに延伸する(延伸B)。
延伸Aでは、未焼成のPTFEシートをPTFEの融点(327℃)以上の温度において1.0m/分以下の延伸線速度で延伸する限り、その具体的な手法は特に限定されない。例えば、上記融点以上の温度に保持した加熱炉内で、1.0m/分以下の延伸線速度を保ちながら未焼成のPTFEシートを延伸すればよい。延伸Aでは、延伸B後に膜の面積に対する面積比率が小さいながらも長いノードとなりうる、当該ノードの前駆体ともいうべきPTFEの凝集部分を形成できる。この凝集部分は、隣り合う凝集部分が互いに平行に近い状態でPTFEシートに複数形成されうる。当該凝集部分の延びる方向は、典型的には、延伸Aの延伸方向に対してシート面内における略垂直の方向である。また、延伸Aでは、延伸B後に50μm以上の平均フィブリル長を達成できるフィブリルを形成できる。このフィブリルの延びる方向は、上記凝集部分の延びる方向に対してシート面内における略垂直の方向でありうる。
延伸Bでは、延伸Aを経たPTFEシートを延伸Aの方向とは異なる方向に延伸する限り、その具体的な手法は限定されない。
PTFE多孔質膜の平均フィブリル長、平均ノード長、及び平均ノード面積比率は、評価対象物であるPTFE多孔質膜の主面の拡大画像をSEM(JEOL製、JSM−6510LV)により取得して、上述した方法により求めた。
PTFE多孔質膜の膜厚方向の平均曲路率は、上述した方法により求めた。
PTFE多孔質膜の防水性は、JIS L1092:2009の耐水度試験B法(高水圧法)の規定に準拠して測定した耐水圧(kPa)により評価した。ただし、耐水圧は、PTFE多孔質膜の膜面の1か所から水が出たときの水圧に基づいて評価した。
PTFE多孔質膜の気孔率は、上述した方法により求めた。
評価法1:PTFE多孔質膜の透湿度は、JIS Z0208:1976の規定(透湿度試験、カップ法)に準拠して評価した。ただし、透湿度の評価にあたり、PTFE多孔質膜の一方の主面の側の雰囲気を温度40℃、湿度100%RHとし、他方の主面の側の雰囲気を温度40℃、湿度50%RHとした。
評価法2:PTFE多孔質膜の透湿度は、JIS L1099:2012(B−1法;酢酸カリウム法)の規定に準拠して評価した。なお、この規定において使用される所定の透湿度測定用補助フィルムの透湿度は、このJISの測定により、75000〜85000g/(m2・day)の範囲にある。補助フィルムの透湿度は、補助フィルムを2枚用い、その一方を補助フィルム、他方を測定対象のフィルムとすることにより測定できる。
PTFEファインパウダー(旭・ICIフロロポリマーズ製、フルオンCD−129E)100重量部と、液状潤滑剤として脂肪族炭化水素19.7重量部とを均一に混合してPTFEペーストを形成した。次に、形成したPTFEペーストを、FTダイスを用いて2.5MPa(25kg/cm2)の圧力でシート状に押出成形し、これを一対の金属ロールによりさらに圧延して、厚みを整えた帯状のPTFEシート(厚さ0.2mm)を得た。次に、得られたPTFEシートを加熱して乾燥させ、液状潤滑剤を除去した。
実施例1で作製したPTFE多孔質膜を、3M製、ハイドロフルオロエーテルNovec7300に含浸させることで、当該多孔質膜に対するスティッキング処理を実施した。当該含浸後のPTFE多孔質膜を乾燥させて、実施例2のPTFE多孔質膜とした。実施例2のPTFE多孔質膜のSEM観察像を図9に示す。
延伸Aの延伸線速度を0.8m/分とした以外は実施例1と同様にして、実施例3のPTFE多孔質膜を得た。
実施例3で作製したPTFE多孔質膜を実施例2と同様にスティッキング処理して、実施例4のPTFE多孔質膜を得た。
PTFEファインパウダー(旭・ICIフロロポリマーズ製、フルオンCD−129E)100重量部と、液状潤滑剤として脂肪族炭化水素19.7重量部とを均一に混合してPTFEペーストを形成した。次に、形成したPTFEペーストを、FTダイスを用いて2.5MPa(25kg/cm2)の圧力でシート状に押出成形し、これを一対の金属ロールによりさらに圧延して、厚みを整えた帯状のPTFEシート(厚さ0.5mm)を得た。次に、得られたPTFEシートを加熱して乾燥させ、液状潤滑剤を除去した。
PTFEファインパウダー(旭・ICIフロロポリマーズ製、フルオンCD−129E)100重量部と、液状潤滑剤として脂肪族炭化水素19.7重量部とを均一に混合してPTFEペーストを形成した。次に、形成したPTFEペーストを、FTダイスを用いて2.5MPa(25kg/cm2)の圧力でシート状に押出成形し、これを一対の金属ロールによりさらに圧延して、厚みを整えた帯状のPTFEシート(厚さ0.5mm)を得た。次に、得られたPTFEシートを加熱して乾燥させ、液状潤滑剤を除去した。
比較例2で作製したPTFE多孔質膜を実施例2と同様にスティッキング処理して、比較例3のPTFE多孔質膜を得た。
Claims (8)
- 平均フィブリル長が50μm以上であり、平均ノード長が平均フィブリル長の5倍以上であり、平均ノード面積比率が5%以下であるポリテトラフルオロエチレン多孔質膜。
- 前記平均ノード面積比率が3%以下である請求項1に記載のポリテトラフルオロエチレン多孔質膜。
- 膜厚方向の平均曲路率が1.5以下である請求項1又は2に記載のポリテトラフルオロエチレン多孔質膜。
- JIS L1092の耐水度試験B法(高水圧法)の規定に準拠して測定した耐水圧が10kPa以上である請求項1〜3のいずれか1項に記載のポリテトラフルオロエチレン多孔質膜。
- 気孔率が90%以上である請求項1〜4のいずれか1項に記載のポリテトラフルオロエチレン多孔質膜。
- JIS L1099(B−1法)の規定に準拠して測定した膜厚方向の透湿度が、150000g/(m2・day)以上である請求項1〜5のいずれか1項に記載のポリテトラフルオロエチレン多孔質膜。
- 請求項1〜6のいずれか1項に記載のポリテトラフルオロエチレン多孔質膜を備える防水通気膜。
- 請求項7に記載の防水通気膜と、前記防水通気膜に接合された支持体と、を備える防水通気部材。
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