JPWO2012137635A1 - 複合半透膜、複合半透膜エレメントおよび複合半透膜の製造方法 - Google Patents
複合半透膜、複合半透膜エレメントおよび複合半透膜の製造方法 Download PDFInfo
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- JPWO2012137635A1 JPWO2012137635A1 JP2012526766A JP2012526766A JPWO2012137635A1 JP WO2012137635 A1 JPWO2012137635 A1 JP WO2012137635A1 JP 2012526766 A JP2012526766 A JP 2012526766A JP 2012526766 A JP2012526766 A JP 2012526766A JP WO2012137635 A1 JPWO2012137635 A1 JP WO2012137635A1
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- composite semipermeable
- semipermeable membrane
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Abstract
Description
(1)基材と多孔性支持体とからなる微多孔性支持膜上にポリアミド分離機能層が形成された複合半透膜であって、該分離機能層の膜厚の標準偏差が2.00nm以下である複合半透膜。
(2)該分離機能層の平均膜厚が14nm以上22nm以下である(1)に記載の複合半透膜。
(3)該多孔性支持体が多層構造を有する(1)または(2)に記載の複合半透膜。
(4)(1)〜(3)のいずれかに記載の複合半透膜、原水流路材および透過水流路材が、多数の孔を穿設した筒状の集水管の周りに巻回された、スパイラル型の複合半透膜エレメント。
(5)基材と多孔性支持体とからなる微多孔性支持膜上にポリアミド分離機能層が形成された複合半透膜の製造方法であって、第1の層を形成する高分子溶液Aと第2の層を形成する高分子溶液Bを、同時に基材上に塗布した後、非溶媒中に浸漬して、高分子溶液Aおよび高分子溶液Bを凝固させて多孔性支持体を形成する工程、および、つづいて該多孔性支持体上に分離機能層を形成する工程を含み、該第1の層は基材と接触するように形成され、該第2の層は分離機能層と接触するように形成され、かつ、該高分子溶液Bの高分子濃度が、該高分子溶液Aの高分子濃度よりも大きい複合半透膜の製造方法。
本発明の複合半透膜を構成する微多孔性支持膜は、基材上に、多孔性支持体を形成するための高分子溶液を塗布し、凝固させることにより形成される。
複合半透膜をPVAで包埋した後、四酸化オスミウムで染色して測定サンプルとした。得られたサンプルをTEMトモグラフィーを用いて撮影し、得られた3D画像を解析ソフトにより解析した。TEMトモグラフィー分析には、日本電子製電界放出型分析電子顕微鏡JEM2100Fを用いた。30万倍の倍率での取得画像を用いて、ひだ状構造の外部表面上のある点から内部表面への最短距離を膜厚とし、ひだ状構造の凸部1個に対し、50箇所の点について解析を行った。ひだ状構造の凸部5個に対して0.1ナノメートル以上の精度で上記の測定および解析を行い、平均膜厚および膜厚の標準偏差をそれぞれ式1および式2より有効数字3桁で算出した。
脱塩率=100×{1−(透過水中の塩濃度/供給水中の塩濃度)} (%)
(膜透過流束)
供給水の膜透過水量と複合半透膜の面積から、膜面積1平方メートルあたり、1日あたりの透水量、すなわち膜透過流束(m3/m2/日)を求めた。
複合半透膜をpH13の水酸化ナトリウム水溶液とpH1の硫酸水溶液とにそれぞれ1時間ずつ室温で浸漬する操作を20サイクル繰り返し、その前後での脱塩率の変化により、耐薬品性を評価した。
SP比=(100−浸漬後の脱塩率)/(100−浸漬前の脱塩率)
なお、SPとはSubstance Peameation:物質透過の略である。
ポリエステル不織布(通気度0.5〜1cc/cm2/sec)を基材として用いた。多孔性支持体形成用の溶液として、ポリスルホンの15.7重量%DMF溶液を調製した。基材上にポリスルホン溶液を200μmの厚みで室温(25℃)でキャストし、ただちに純水中に浸漬して5分間放置することによって微多孔性支持膜(厚さ210〜215μm)を作製した。
参考例1と同様のポリエステル不織布を基材として用いた。第1のポリスルホン溶液(14.0重量%DMF溶液)と第2のポリスルホン溶液(17.0重量%DMF溶液)を調製した。二重スリットダイコーターを用いて、第1のポリスルホン溶液および第2のポリスルホン溶液を同時に吐出し、基材上に第1のポリスルホン溶液を、第1のポリスルホン溶液の上に第2のポリスルホン溶液をキャストした。第1のポリスルホン溶液の厚みが180μm、第2のポリスルホン溶液の厚みが20μmとなるようにキャストし、ただちに純水中に浸漬して5分間放置することによって微多孔性支持膜を作製した。
参考例2で得られた微多孔性支持膜に、m−PDAの2.0重量%水溶液を塗布して2分間静置した後、エアーノズルから窒素を吹き付けて微多孔性支持膜表面から余分な水溶液を取り除いた。続いて、その上に、トリメシン酸クロリド0.07重量%を含むn−デカン溶液を、表面が完全に濡れるように塗布して10秒間静置した後、膜から余分な溶液を除去するために膜を1分間垂直に保持して液切りした。このようにして得られた膜を、90℃の熱水で2分間洗浄して、複合半透膜を得た。得られた複合半透膜について、分離機能層の平均膜厚、膜厚の標準偏差、膜性能および耐薬品性はそれぞれ表1に示す通りであった。
m−PDA水溶液の濃度を2.2重量%、トリメシン酸クロリド溶液の濃度を0.08重量%としたこと以外は実施例1と同様の方法により複合半透膜を得た。得られた複合半透膜について、分離機能層の平均膜厚、膜厚の標準偏差、膜性能および耐薬品性はそれぞれ表1に示す通りであった。
m−PDA水溶液の濃度を2.4重量%、トリメシン酸クロリド溶液の濃度を0.08重量%としたこと以外は実施例1と同様の方法により複合半透膜を得た。得られた複合半透膜について、分離機能層の平均膜厚、膜厚の標準偏差、膜性能および耐薬品性はそれぞれ表1に示す通りであった。
m−PDA水溶液の濃度を2.8重量%、トリメシン酸クロリド溶液の濃度を0.1重量%としたこと以外は実施例1と同様の方法により複合半透膜を得た。得られた複合半透膜について、分離機能層の平均膜厚、膜厚の標準偏差、膜性能および耐薬品性はそれぞれ表1に示す通りであった。
m−PDA水溶液の濃度を3.0重量%、トリメシン酸クロリド溶液の濃度を0.1重量%としたこと以外は実施例1と同様の方法により複合半透膜を得た。得られた複合半透膜について、分離機能層の平均膜厚、膜厚の標準偏差、膜性能および耐薬品性はそれぞれ表1に示す通りであった。
m−PDA水溶液の濃度を3.2重量%、トリメシン酸クロリド溶液の濃度を0.11重量%としたこと以外は実施例1と同様の方法により複合半透膜を得た。得られた複合半透膜について、分離機能層の平均膜厚、膜厚の標準偏差、膜性能および耐薬品性はそれぞれ表1に示す通りであった。
参考例1で得られた微多孔性支持膜に、m−PDAの2.2重量%水溶液を塗布して2分間静置した後、エアーノズルから窒素を吹き付けて微多孔性支持膜表面から余分な水溶液を取り除いた。続いて、その上に、トリメシン酸クロリド0.08重量%を含むn−デカン溶液を表面が完全に濡れるように塗布して10秒間静置した後、膜から余分な溶液を除去するために膜を1分間垂直に保持して液切りした。このようにして得られた膜を、90℃の熱水で2分間洗浄して複合半透膜を得た。得られた複合半透膜について、分離機能層の平均膜厚、膜厚の標準偏差、膜性能および耐薬品性はそれぞれ表1に示す通りであった。
m−PDA水溶液の濃度を3.0重量%、トリメシン酸クロリド溶液の濃度を0.1重量%としたこと以外は比較例1と同様の方法により複合半透膜を得た。得られた複合半透膜について、分離機能層の平均膜厚、膜厚の標準偏差、膜性能および耐薬品性はそれぞれ表1に示す通りであった。
Claims (5)
- 基材と多孔性支持体とからなる微多孔性支持膜上にポリアミド分離機能層が形成された複合半透膜であって、該分離機能層の膜厚の標準偏差が2.00nm以下である複合半透膜。
- 該分離機能層の平均膜厚が14nm以上22nm以下である請求項1に記載の複合半透膜。
- 該多孔性支持体が多層構造を有する請求項1または2に記載の複合半透膜。
- 請求項1〜3のいずれかに記載の複合半透膜、原水流路材および透過水流路材が、多数の孔を穿設した筒状の集水管の周りに巻回された、スパイラル型の複合半透膜エレメント。
- 基材と多孔性支持体とからなる微多孔性支持膜上にポリアミド分離機能層が形成された複合半透膜の製造方法であって、第1の層を形成する高分子溶液Aと第2の層を形成する高分子溶液Bを、同時に基材上に塗布した後、非溶媒中に浸漬して、高分子溶液Aおよび高分子溶液Bを凝固させて多孔性支持体を形成する工程、および、つづいて該多孔性支持体上に分離機能層を形成する工程を含み、該第1の層は基材と接触するように形成され、該第2の層は分離機能層と接触するように形成され、かつ、該高分子溶液Bの高分子濃度が、該高分子溶液Aの高分子濃度よりも大きい複合半透膜の製造方法。
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KR102262062B1 (ko) * | 2014-08-08 | 2021-06-08 | 도레이 카부시키가이샤 | 내용제성 분리막 |
JP2016055219A (ja) * | 2014-09-05 | 2016-04-21 | 日東電工株式会社 | 複合半透膜、分離膜エレメント、及びその製造方法 |
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JP5978998B2 (ja) | 2016-08-24 |
EP2695670A1 (en) | 2014-02-12 |
KR101985351B1 (ko) | 2019-06-03 |
KR20180124151A (ko) | 2018-11-20 |
CN103492060A (zh) | 2014-01-01 |
US20190070569A1 (en) | 2019-03-07 |
CN103492060B (zh) | 2016-03-30 |
KR20140016271A (ko) | 2014-02-07 |
WO2012137635A1 (ja) | 2012-10-11 |
US20140183127A1 (en) | 2014-07-03 |
EP2695670A4 (en) | 2015-05-27 |
EP2695670B1 (en) | 2020-04-29 |
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