JP2013142156A - ポリオレフィン系微多孔膜及びその製造方法 - Google Patents
ポリオレフィン系微多孔膜及びその製造方法 Download PDFInfo
- Publication number
- JP2013142156A JP2013142156A JP2013000559A JP2013000559A JP2013142156A JP 2013142156 A JP2013142156 A JP 2013142156A JP 2013000559 A JP2013000559 A JP 2013000559A JP 2013000559 A JP2013000559 A JP 2013000559A JP 2013142156 A JP2013142156 A JP 2013142156A
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- Prior art keywords
- microporous membrane
- polyolefin
- stretching
- polyolefin microporous
- temperature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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Classifications
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Abstract
【解決手段】本発明によるポリオレフィン系微多孔膜は、少なくとも一層以上であり、最大孔径が0.1μm以下であるポリエチレン層からなり、膜厚が5〜40μmであり、空隙率が30〜60%であり、穿孔強度が0.22N/μm以上であり、品質係数が20gf/(sec/100cc)以上であることを特徴とする。本発明によるポリオレフィン系微多孔膜は、機械的強度、透過度、及び熱収縮特性に優れ、高容量/高出力の電池用分離膜に適する。
Description
[式1]
品質係数(Q)=S/(P×HS)
S:穿孔強度(gf)
P:気体透過度(Gurley、sec/100cc)
HS:130℃で1時間における横方向の収縮率
[式1]
品質係数(Q)=S/(P×HS)
S:穿孔強度(gf)
P:気体透過度(Gurley、sec/100cc)
HS:130℃で1時間における横方向の収縮率
[式1]
品質係数(Q)=S/(P×HS)
S:穿孔強度(gf)
P:気体透過度(Gurley、sec/100cc)
HS:130℃で1時間における横方向の収縮率
ポリオレフィン樹脂の分子量は、Polymer Laboratory社製の高温GPC(Gel Permeation Chromatography)を用いて1,2,4−トリクロロベンゼン(TCB)を溶媒として140℃にて測定し、分子量測定の標準試料としてはポリスチレン(Polystyrene)を用いた。
ポリオレフィン系樹脂の溶融温度(Tm)はDSC(Differential Scanning Calorimetry、Mettler Toledo社製、DSC−822E)で分析した。ポリオレフィン系樹脂の分析条件は、サンプル重量5mgを10℃/minの走査速度(scanning rate)で樹脂が完全に溶融するまで昇温した後、その温度で10分間維持して完全な溶融状態にした後、10℃/minの走査速度(scanning rate)で0℃に降温して完全な固体状態に結晶化してから再度10℃/minの走査速度(scanning rate)で昇温して樹脂の溶融温度を決定した。
TESA社製のTESA Mu−Hite Electronic Height Gaugeを用いて測定圧力を0.63Nとして最終製品の厚さを測定した。
Instron社製のUTM(universal testing machine)に1mmの直径、0.5mmの曲率半径を有するピンを装着し、23℃の温度で移動速度を120mm/minとして隔離膜を破断する時の隔離膜の強度を測定した。この際、測定された荷重をgf単位で表し、標準化した厚さ値をN/μmで表した。
気体透過度は、JIS P8117に基づきToyoseiki社製のGurley type densometer(G−B2C)を用いて測定した。
隔離膜を15cm×15cmにカットした後、縦方向と横方向に10cmの間隔で表示し、紙の間に挟んで130℃に温度安定化されたオーブン(JEIO TECH社製、OF−12GW)に入れて60分間放置した後、間隔変化を測定して収縮率を算出した。収縮率は、下記の式に従って算出した。
収縮率(%)=100×(初期の間隔−130℃放置後の間隔)/初期の間隔
空隙率は隔離膜内の空間を計算して算出した。サンプルをAcm×Bcmの長方形(厚さ:Tμm)にカットして質量を測定し、同じ体積の樹脂重量と隔離膜の重量(M g)の割合により空隙率を算出した。その式は下記のとおりである。
空隙率(%)=100×{1−M×10000/(A×B×T×ρ)}
式中ρ(g/cm3)は樹脂の密度である。
最大孔径は、ASTM F316−03に基づき、気孔計(porometer:PMI社製、CFP−1500−AEL)で測定した。最大孔径はバブルポイント法により測定した。孔径を測定するためにPMI社製のGalwick液(surface tension :15.9dyne/cm)を用いた。
分離膜の安全性を確認する過充電テストは下記の方法により行った。正極(cathode)は、アルミニウム薄膜の両面にLiCoO2をコーティングして112mm×77mmの大きさに製造し、負極(anode)は、銅の両面にグラファイト(graphite)をコーティングして115mm×77mmの大きさに製造した。正極と負極に電極タブを溶接して付着し、正極、負極、及び分離膜を次のような順に積層してプラスチックでコーティングしたアルミ袋に入れてプレスを用いて圧着した。
(C/2)/S/A/S/C/S/A/S〜/C/S/A/S/(C/2)
(C/2):片面のみコーティングした正極
C:両面コーティングした正極
A:両面コーティングした負極
S:隔離膜
成分Iとして重量平均分子量が3.0×105であり、溶融温度が135℃である高密度ポリエチレンが用いられ、成分IIとして40℃で動粘度が160cStであるパラフィンオイルが用いられた。成分Iと成分IIの重量パーセントは、それぞれ25%と75%であった。
成分Iとして重量平均分子量が3.0×105であり、溶融温度が135℃である高密度ポリエチレンが用いられ、成分IIとして40℃で動粘度が160cStであるパラフィンオイルが用いられた。成分Iと成分IIの重量パーセントは、それぞれ30%と70%であった。
比較例2と同じ条件下で押出、シート成形、及び延伸などを行い、熱処理工程のみ異なるように行った。熱処理工程は横方向に行われ、熱処理工程の段階別の温度、熱延伸の割合、熱緩和の割合は下記表1に示しており、各段階は5秒間行われた。得られた分離膜の物性は下記表2に示した(割合は、前段階の最終幅と現段階の最終幅の長さ比である。)。
比較例2と同じ条件下で押出、シート成形、延伸などを行い、熱処理工程のみ異なるように行った。熱処理工程は横方向に行われ、熱処理工程の段階別の温度、熱延伸の割合、熱緩和の割合は下記表1に示しており、各段階は5秒間行われた。得られた分離膜の物性は下記表2に示した(割合は、前段階の最終幅と現段階の最終幅の長さ比である。)。
比較例2と同一の条件下で押出、シート成形、及び延伸などを行い、熱処理工程のみ異なるように行った。熱処理工程は横方向に行われ、熱処理工程の段階別の温度、熱延伸の割合、熱緩和の割合は下記表1に示しており、各段階は5秒間行われた。得られた分離膜の物性は下記表2に示した(割合は、前段階の最終幅と現段階の最終幅の長さ比である。)。
比較例2と同じ条件下で押出、シート成形、及び延伸などを実施して熱処理工程のみ異なるように行った。熱処理工程は横方向に行われ、熱処理工程の段階別の温度、熱延伸の割合、熱緩和の割合は下記表1に示しており、各段階は5秒間行われた。得られた分離膜の物性は下記表2に示した(割合は、前段階の最終幅と現段階の最終幅の長さ比である。)。
成分Iとして重量平均分子量が3.8×105であり、溶融温度が135℃である高密度ポリエチレンが用いられ、成分IIとして40℃で動粘度が160cStであるパラフィンオイルとフタル酸ジオクチルを1:1に混合したものが用いられた。成分Iと成分IIの重量パーセントは、それぞれ25%と75%であった。
Claims (8)
- 少なくとも一層以上積層されたポリオレフィン系微多孔膜であって、
バブルポイント法により測定した最大孔径が0.1μm以下であるポリエチレン層を含み、ポリオレフィン系微多孔膜の厚さが5〜40μmであり、空隙率が30〜60%であり、穿孔強度が0.22N/μm以上であり、下記式1の品質係数が20gf/(sec/100cc)以上である、ポリオレフィン系微多孔膜。
[式1]
品質係数(Q)=S/(P×HS)
S:穿孔強度(gf)
P:気体透過度(Gurley、sec/100cc)
HS:130℃で1時間における横方向の収縮率 - ポリオレフィン系微多孔膜の気体透過度が340sec/(100cc×20μm)以下である、請求項1に記載のポリオレフィン系微多孔膜。
- ポリオレフィン系微多孔膜の穿孔強度が0.28N/μm以上である、請求項1または2に記載のポリオレフィン系微多孔膜。
- ポリオレフィン系微多孔膜の品質係数が25以上である、請求項1〜3のいずれかに記載のポリオレフィン系微多孔膜。
- ポリオレフィン系微多孔膜の品質係数が30以上である、請求項4に記載のポリオレフィン系微多孔膜。
- ポリオレフィン系微多孔膜の品質係数が40以上である、請求項5に記載のポリオレフィン系微多孔膜。
- 湿式ポリオレフィン系微多孔膜の製造方法であって、
抽出工程の前にポリオレフィン樹脂とダイルエントを混練して押出する工程、シート成形工程、及び延伸工程を行い、
前記抽出工程の後に3段階以上からなる熱処理工程を行い、
前記熱処理工程は、2回以上の熱延伸段階、及び2回以上の熱延伸段階の間の1回以上の熱緩和段階を含む、ポリオレフィン系微多孔膜の製造方法。 - 熱処理工程のうち最初の延伸段階は、[ポリオレフィン系樹脂の溶融温度−30℃]〜[ポリオレフィン系樹脂の溶融温度]の温度範囲で行われ、[最初の熱延伸温度]〜[最初の熱延伸温度+20℃]の温度範囲でさらに熱延伸する段階を含む、請求項7に記載のポリオレフィン系微多孔膜の製造方法。
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- 2013-01-04 TW TW102100207A patent/TWI575001B/zh active
- 2013-01-04 EP EP13150230.4A patent/EP2612702B1/en active Active
- 2013-01-06 CN CN201310004226.4A patent/CN103205041B/zh active Active
- 2013-01-07 JP JP2013000559A patent/JP6231745B2/ja active Active
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WO2000049073A1 (en) * | 1999-02-19 | 2000-08-24 | Tonen Chemical Corporation | Polyolefin microporous film and method for preparing the same |
JP2004323820A (ja) * | 2003-04-11 | 2004-11-18 | Asahi Kasei Chemicals Corp | ポリオレフィン微多孔膜及びその製造方法 |
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WO2011024849A1 (ja) * | 2009-08-25 | 2011-03-03 | 旭化成イーマテリアルズ株式会社 | 微多孔膜捲回体及びその製造方法 |
WO2013054929A1 (ja) * | 2011-10-14 | 2013-04-18 | 東レ株式会社 | 多孔性ポリプロピレンフィルムおよび蓄電デバイス |
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US10532329B2 (en) | 2013-11-14 | 2020-01-14 | Entegris, Inc. | Microporous polyamide-imide membranes |
US10919001B2 (en) | 2013-11-14 | 2021-02-16 | Entegris, Inc. | Microporous polyamide-imide membranes |
JP2016062642A (ja) * | 2014-09-12 | 2016-04-25 | 積水化学工業株式会社 | ポリオレフィン系樹脂微孔フィルム及びその製造方法、並びにリチウムイオン電池用セパレータ |
Also Published As
Publication number | Publication date |
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TW201333081A (zh) | 2013-08-16 |
EP2612702B1 (en) | 2020-04-15 |
CN103205041B (zh) | 2017-06-09 |
JP6231745B2 (ja) | 2017-11-15 |
US20130177755A1 (en) | 2013-07-11 |
KR101886681B1 (ko) | 2018-08-08 |
TWI575001B (zh) | 2017-03-21 |
CN103205041A (zh) | 2013-07-17 |
KR20130080928A (ko) | 2013-07-16 |
EP2612702A1 (en) | 2013-07-10 |
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