JP7273415B2 - 複合多孔質膜及びその製造方法と用途 - Google Patents
複合多孔質膜及びその製造方法と用途 Download PDFInfo
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- JP7273415B2 JP7273415B2 JP2020511525A JP2020511525A JP7273415B2 JP 7273415 B2 JP7273415 B2 JP 7273415B2 JP 2020511525 A JP2020511525 A JP 2020511525A JP 2020511525 A JP2020511525 A JP 2020511525A JP 7273415 B2 JP7273415 B2 JP 7273415B2
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Description
[発明の内容]
(S1)ポリプロピレン中にβ結晶の形成を促進する造核剤を添加する;
(S2)工程(S1)での造核剤を混合したポリプロピレンを溶融押出し、成形することで高含量のβ結晶膜が得られる;
(S3)高含量のβ結晶膜を、縦方向に延伸し縦方向延伸膜を得て、塗布液を上記縦方向延伸膜の片側または両側の表面に塗布する;
(S4)塗布液を塗布した縦方向延伸膜を、横方向に延伸することで上記複合多孔質膜を得る。
(S2’)塗布液を工程(S2)で得られた高含量のβ結晶膜の片側または両側の表面に塗布し、塗布液を塗布した高含量のβ結晶膜板が得られる。
上記有機溶媒を媒体とした溶液には、有機溶媒でポリマーまたはポリマー組成物を溶解した溶液が含まれる;上記水を媒体とした溶液には、水で水溶性ポリマーまたは水溶性ポリマー組成物を溶解した溶液が含まれる;上記水を媒体とした分散液には、非水溶性のポリマーまたは非水溶性のポリマー組成物を、乳化重合する方法で得られたポリマーまたはポリマー組成物のエマルジョンが含まれるか、または非水溶性のポリマーまたは非水溶性のポリマー組成物を、研磨または粉砕する方法で得られたポリマーまたはポリマー組成物を含む水性分散液が含まれる。
縦方向延伸膜の片側または両側の表面に塗布液を塗布してから、さらに横方向に延伸することで上記複合多孔質膜を製造し得る。
1)ポリプロピレン中にβ結晶の形成を促進する造核剤を添加し、造核剤を混合したポリプロピレンを溶融押出し、成形することで高含量のβ型結晶膜が得られる;
2)高含量のβ結晶膜を、縦方向に延伸し縦方向延伸膜が得られるが、縦方向延伸膜の片側または両側の表面に塗布液を塗布してから、さらに横方向に延伸することで、上記複合多孔質膜を製造し得る;
本発明の第2番目及び第3番目により、工程(S2)および工程1)に置いて、上記高含量のβ型結晶膜は、ポリプロピレンの高含量のβ結晶膜である。上記ポリプロピレンの立体規則性及び溶融流動指数には特に制限しないものの、当該ポリプロピレンを、造核剤の参与で高含量のβ結晶膜に製造し、さらに縦方向に延伸することで孔隙率が5-35%である縦方向延伸膜が得られる。例示的に、上記ポリプロピレンはポリプロピレンホモポリマーまたはポリプロピレンコポリマーである。好ましくは、上記ポリプロピレンの立体規則性は90-98%である;溶融流動指数は1-10g/10minである。さらに好ましくは、上記ポリプロピレンの立体規則性は95-98%である;溶融流動指数は2-5g/10minである。
a)ポリプロピレンを溶融押出し、高速延伸による配向成形をすることで、始発のポリプロピレン膜が得られる。
c’)ポリプロピレン予備延伸シートを多層ラミネート処理し、20-50°Cで20-50%の予備延伸をしてから、100-130°Cで引き続き30-80%延伸し、選択的に延伸後の多層ラミネートされた縦方向延伸膜を剥離することで、縦方向延伸膜を製造しうる;そして、縦方向延伸膜の片側または両側の表面に塗布液を塗布し、さらに横方向に延伸することで、上記複合多孔質膜を製造し得る。
上記原料供給押出システムは、流涎キャスティングシステムを介して縦方向延伸システムと繋がっており、上記縦方向延伸システムは、第2塗布システムを介して横方向延伸システムと繋がっている。
好ましくは、上記第1溶融体パイプ中にはさらに計量ポンプを設置している。
本発明において、上記装置は、さらに牽引巻取システムを含むが、その目的は製造された複合多孔質膜を上記牽引巻取システムに通すことでロール状の複合多孔質膜を得ることである。
(a)β結晶の形成を促進することができる造核剤を含むポリプロピレンを、原料供給装置にてスクリュー押出機に送り込み溶融させ、溶融体は、第1溶融体パイプを介して計量ポンプを経過し、正確に計量された後、濾過器で濾過された後第2溶融体パイプに入る。
好ましくは、第1塗布システムにより塗布液を膜の片側または両側の表面に塗布する。
(g)工程(f)の複合多孔質膜を、牽引巻き取りシステムに通過させることでロール状の複合多孔質膜を得る。
1.本発明は、複合多孔質膜及びその製造方法と用途とを提供する。上記複合多孔質膜は、少なくとも1層の多孔質ベース層と、上記多孔質ベース層の少なくとも片側表面に位置する少なくとも1層の一軸延伸塗布層を含む。具体的に、上記複合多孔質膜は、少なくとも1層の多孔質ベース層と、上記多孔質ベース層の片側または両側の表面に位置する少なくとも1層の複合多孔質膜の横方向延伸方向に沿って配向したナノ繊維状の非ポリオレフィン系ポリマー多孔質層と、を含み、または、上記複合多孔質膜は、二軸延伸のポリプロピレン多孔質ベース層と、上記多孔質ベース層の少なくとも片側表面に位置する一軸延伸塗布層と、を含む。上記製造方法では、横方向への延伸前に塗布液を導入する方法で上記複合多孔質膜を製造し、上記複合多孔質膜の横方向延伸方向に沿って配向したナノ繊維状の非ポリオレフィン系ポリマー多孔質層は、複合多孔質膜の使用中での縦方向への亀裂を抑制するため、複合多孔質膜の使用性能を向上する。
本発明の目的と、技術案と、利点と、をより明確にするため、以下具体的な実施例を持って、添付図を参考に、本発明をさらに詳しく説明する。だが、当業者がわかるように、本発明は添付図及び以下の実施例だけに制限されるものではない。
[比較例1]
Claims (10)
- 複合多孔質膜であって、少なくとも一層の多孔質ベース層と、上記多孔質ベース層の片側表面または両側表面に位置する少なくとも一層の複合多孔質膜の横方向延伸方向に沿って配向したナノ繊維状の非ポリオレフィン系ポリマーの多孔質層である一軸延伸塗布層と、を含む複合多孔質膜。
- 請求項1に記載の複合多孔質膜に基づき、上記ナノ繊維の直径は10-500nmであることを特徴とする複合多孔質膜。
- 請求項1又は2に記載の複合多孔質膜に基づき、そのうち、
上記多孔質ベース層は、多孔質ポリオレフィンベース層から選ばれ、上記多孔質ポリオレフィンベース層は、多孔質ポリエチレンベース層、多孔質ポリプロピレンベース層、または多孔質ポリプロピレン/ポリエチレン/ポリプロピレン三層複合ベース層から選ばれる複合多孔質膜。 - 請求項1-3のいずれか一項に記載の複合多孔質膜の製造方法であり、上記方法は以下の工程:
縦方向延伸膜の片側表面または両側表面に塗布液を塗布してから、横方向に延伸することで上記複合多孔質膜を製造し、
その縦方向延伸膜を横方向に延伸処理することで上記記載の多孔質ベース層を製造し;そのうちの塗布液を横方向に延伸処理することで複合多孔質膜の横方向延伸方向に沿って配向したナノ繊維状の非ポリオレフィン系ポリマー多孔質層を製造する工程を含む。 - 請求項4に記載の製造方法に基づき、上記塗布液は、水を媒体とした分散液であり;上記塗布液は、非水溶性のポリマーまたは非水溶性のポリマー組成物を含み;上記非水溶性のポリマーまたは非水溶性のポリマー組成物は、粒子状として系内に分散しており、上記粒子の平均粒径は0.01-3μmであることを特徴とする製造方法。
- 請求項5に記載の製造方法に基づき、
上記水を媒体とした分散液は、非水溶性のポリマーまたは非水溶性のポリマー組成物を、乳化重合する方法でポリマーまたはポリマー組成物のエマルジョンを得るか、または、非水溶性のポリマーまたは非水溶性のポリマー組成物を、研磨または粉砕する方法でポリマーまたはポリマー組成物を含む水性分散液を得る製造方法。 - 請求項6に記載の製造方法に基づき、水を媒体とした分散液において、上記非水溶性のポリマーまたは非水溶性のポリマー組成物の含有量は、質量%で5-50%であることを特徴とする製造方法。
- 請求項4-7に記載の製造方法に基づき、上記塗布液中にはさらに有機フィラーまたは無機フィラーが含まれる;上記無機フィラーには、二酸化ケイ素、二酸化チタン、酸化ランタン、二酸化ジルコニウム、酸化アルミニウム、硫酸バリウム、炭酸カルシウム、窒化炭素、ベーマイト、炭化ケイ素、分子篩、タルク、モンモリロンせき中の一種または多種を含まれ;上記有機フィラーには、耐高温高分子中の一種または多種が含まれる;
及び/又は、上記塗布液中にはさらに接着剤が含まれるが;上記接着剤は、少なくともポリアクリレートエマルジョン、ポリウレタンエマルジョン、ポリ(ブタジエンスチレン)エマルジョン、ポリビニルアルコール、カルボキシメチルセルロース中の一種を含むことを特徴とする製造方法。 - リチウム電池セパレーターであり、請求項1-3のいずれかの一項に記載の複合多孔質膜を含むリチウム電池セパレーター。
- ガス分離膜であり、請求項1-3のいずれかの一項に記載の複合多孔質膜を含むガス分離膜。
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WO2019037785A1 (zh) | 2019-02-28 |
EP3674354A1 (en) | 2020-07-01 |
US20200360866A1 (en) | 2020-11-19 |
KR20200047451A (ko) | 2020-05-07 |
JP2020531323A (ja) | 2020-11-05 |
EP3674354A4 (en) | 2021-07-28 |
US11603443B2 (en) | 2023-03-14 |
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