CN114230824B - 聚偏氟乙烯薄膜组合物及聚偏氟乙烯隔离膜 - Google Patents
聚偏氟乙烯薄膜组合物及聚偏氟乙烯隔离膜 Download PDFInfo
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- 229920002981 polyvinylidene fluoride Polymers 0.000 title claims abstract description 146
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Abstract
本发明提供一种聚偏氟乙烯薄膜组合物及聚偏氟乙烯隔离膜。聚偏氟乙烯薄膜组合物包括:聚偏氟乙烯、聚醚酰亚胺以及聚醚型非离子表面活性剂。聚偏氟乙烯与聚醚酰亚胺的重量比为1:1~19:1,且相对于聚偏氟乙烯薄膜组合物的总重量为100%而言,聚醚型非离子表面活性剂的重量百分比为0.1%~10%。
Description
技术领域
本发明涉及一种聚偏氟乙烯薄膜组合物及聚偏氟乙烯隔离膜。
背景技术
聚偏氟乙烯由于耐热、耐酸、耐药性佳,其多孔膜材被开发用在水处理和隔离膜等,然聚偏氟乙烯的本质为疏水性,水滴接触角约为90至100度,故造成薄膜的润湿效果差且过滤时的纯水通量低。
此外,制造聚偏氟乙烯隔离膜的过程中,材料本质容易导致薄膜收缩,产品会呈现翘曲状态。因此,聚偏氟乙烯相关产品仍须持续开发。
发明内容
本发明提供一种聚偏氟乙烯薄膜组合物,包括:聚偏氟乙烯、聚醚酰亚胺以及聚醚型非离子表面活性剂。聚偏氟乙烯与聚醚酰亚胺的重量比为1:1~19:1,且相对于聚偏氟乙烯薄膜组合物的总重量为100%而言,聚醚型非离子表面活性剂的重量百分比为0.1%~10%。
本发明也提供一种聚偏氟乙烯隔离膜,包括:聚偏氟乙烯薄膜、以及复数个微孔洞分散在所述聚偏氟乙烯薄膜中,且在所述聚偏氟乙烯薄膜的表面形成开口。聚醚酰亚胺颗粒分布在所述微孔洞的表面。聚偏氟乙烯薄膜包括聚偏氟乙烯、聚醚酰亚胺以及聚醚型非离子表面活性剂。聚偏氟乙烯与聚醚酰亚胺的重量比为1:1~19:1,且相对于聚偏氟乙烯薄膜组合物的总重量为100%而言,聚醚型非离子表面活性剂的重量百分比为0.1%~10%。
为让本发明的上述特征和优点能更明显易懂,下文特举实施例作详细说明如下。
附图说明
图1是本发明实施例2制备的聚偏氟乙烯隔离膜横截面的SEM照片。
图2是本发明实施例2制备的聚偏氟乙烯隔离膜表面的SEM照片。
图3是本发明实施例5G制备聚偏氟乙烯隔离膜横截面的SEM照片。
图4是本发明实施例5G制备的聚偏氟乙烯隔离膜表面的SEM照片。
图5是本发明实施例6G制备的聚偏氟乙烯隔离膜横截面的SEM照片。
图6是本发明实施例6G制备的聚偏氟乙烯隔离膜表面的SEM照片。
图7为实施例2的聚偏氟乙烯隔离膜的傅里叶变换红外线光谱的测定结果。
图8为实施例2的聚偏氟乙烯隔离膜与聚偏氟乙烯粉末以及聚醚酰亚胺粉末的FTIR测定结果的比对图。
具体实施方式
以下详细叙述本发明内容的实施例。实施例所提出的实施细节为举例说明之用,并非对本发明内容欲保护的范围做限缩。具有通常知识者当可依据实际实施态样的需要对该些实施细节加以修饰或变化。本发明所述的“一”表示为“至少一”。
根据本发明的数个实施例,本发明的聚偏氟乙烯薄膜组合物,包括:聚偏氟乙烯、聚醚酰亚胺以及聚醚型非离子表面活性剂。
根据本发明的数个实施例,所述组合物的所述聚偏氟乙烯与所述聚醚酰亚胺的重量比可为1:1~19:1,例如可为1:1、2:1、3:1、3.5:1、5:1、10:1、15:1、17:1、19:1等。加入亲水性的聚醚酰亚胺可改善聚偏氟乙烯薄膜内部的疏水性问题,润湿性也获得改善,并增加聚偏氟乙烯薄膜的纯水通量。又软材质的聚醚酰亚胺能和聚偏氟乙烯高分子链相互缠绕,因此,聚醚酰亚胺颗粒能依附在聚偏氟乙烯薄膜上,且所形成的薄膜外观不易呈现翘曲状态,其膜面平整与均匀性也能够获得改善。
根据本发明的数个实施例,所述组合物的所述聚醚型非离子表面活性剂的重量百分比可为0.1%~10%,相对于聚偏氟乙烯薄膜组合物的总重量为100%而言,例如可为0.1%、0.5%、1%、2%、5%、10%等。聚醚型非离子表面活性剂有助于调控聚醚酰亚胺的颗粒尺寸,若聚醚型非离子表面活性剂含量太低,不利于增加聚醚酰亚胺的颗粒尺寸,即便提升聚偏氟乙烯隔离膜工艺水浴温度,效果也不大。
根据本发明的数个实施例,所述组合物的聚醚酰亚胺为颗粒状,所述颗粒的平均粒径可为100nm~20μm,例如可为100nm、200nm、300nm、400nm、500nm、600nm、700nm、800nm、900nm、1μm、3μm、5μm、10μm、20μm等。
根据本发明的数个实施例,所述组合物的所述聚偏氟乙烯的重量平均分子量为200,000~1,000,000,例如为200,000~800,000、200,000~600,000、400,000~800,000、400,000~600,000等。
根据本发明的数个实施例,所述组合物的所述聚醚酰亚胺的重量平均分子量为20,000~100,000,例如为20,000~80,000、20,000~60,000、40,000~80,000、40,000~60,000等。
根据本发明的数个实施例,所述组合物的所述聚醚型非离子表面活性剂可为聚氧乙烯-聚氧丙烯多元共聚物。
根据本发明的数个实施例,所述聚氧乙烯-聚氧丙烯多元共聚物的重量平均分子量可为1,000~10,000,例如为1,000、2,000、4,000、6,000、8,000、10,000等。
根据本发明的数个实施例,所述聚氧乙烯-聚氧丙烯多元共聚物可具有如下述式(C-1)至式(C-4)所示的结构中的至少一种:
式(C-1)至式(C-4)中,a1~a9表示氧亚丙基的平均重复数,可为1~100的整数,b1~b10表示氧亚乙基的平均重复数,可为1~100的整数。
根据本发明的数个实施例,所述聚氧乙烯-聚氧丙烯多元共聚物可为“直链型结构”,如式(C-1)、式(C-2)所示的结构;也可为“支链型结构”,如式(C-3)、式(C-4)所示的结构。
根据本发明的数个实施例,所述聚醚型非离子表面活性剂可单独使用一种,也可同时使用多种,比如单独使用支链型结构或将直链型结构以及支链型结构两者混用。
根据本发明的数个实施例,本发明也提供一种聚偏氟乙烯隔离膜,包括:聚偏氟乙烯薄膜、以及多个微孔洞,分散在所述聚偏氟乙烯薄膜中,且在所述聚偏氟乙烯薄膜的表面形成开口。聚醚酰亚胺颗粒分布在所述微孔洞的表面。聚偏氟乙烯薄膜包括聚偏氟乙烯、聚醚酰亚胺以及聚醚型非离子表面活性剂。聚偏氟乙烯与聚醚酰亚胺的重量比为1:1~19:1,且相对于聚偏氟乙烯薄膜组合物的总重量为100%而言,聚醚型非离子表面活性剂的重量百分比为0.1%~10%。
根据本发明的数个实施例,所述聚偏氟乙烯隔离膜的薄膜中聚偏氟乙烯与聚醚酰亚胺的重量比可为1:1~19:1,例如可为1:1、2:1、3:1、3.5:1、5:1、10:1、15:1、17:1、19:1等。
根据本发明的数个实施例,所述聚偏氟乙烯隔离膜的薄膜中的聚偏氟乙烯的重量平均分子量为200,000~1,000,000,例如为200,000~800,000、200,000~600,000、400,000~800,000、400,000~600,000等。
根据本发明的数个实施例,所述聚偏氟乙烯隔离膜的薄膜中的聚醚酰亚胺的重量平均分子量为20,000~100,000,例如为20,000~80,000、20,000~60,000、40,000~80,000、40,000~60,000等。
根据本发明的数个实施例,所述聚偏氟乙烯隔离膜的薄膜中的聚醚型非离子表面活性剂的重量百分比可为0.1%~10%,相对于聚偏氟乙烯薄膜组合物的总重量为100%而言,例如可为0.1%、0.5%、1%、2%、5%、10%等。聚醚型非离子表面活性剂有助于聚偏氟乙烯隔离膜形成微孔洞且有助于调控聚醚酰亚胺的颗粒尺寸,若聚醚型非离子表面活性剂含量太低,不利于隔离膜形成微孔洞及增加聚醚酰亚胺的颗粒尺寸,即便提升聚偏氟乙烯隔离膜工艺温度,效果也不大。
根据本发明的数个实施例,所述聚偏氟乙烯隔离膜的薄膜中的聚醚型非离子表面活性剂可为聚氧乙烯-聚氧丙烯多元共聚物。
根据本发明的数个实施例,所述聚氧乙烯-聚氧丙烯多元共聚物的重量平均分子量可为1,000~10,000,例如为1,000、2,000、4,000、6,000、8,000、10,000等。
根据本发明的数个实施例,所述聚氧乙烯-聚氧丙烯多元共聚物可具有如下述式(C-1)至式(C-4)所示的结构中的至少一种:
式(C-1)至式(C-4)中,a1~a9表示氧亚丙基的平均重复数,可为1~100的整数,b1~b10表示氧亚乙基的平均重复数,可为1~100的整数。
根据本发明的数个实施例,所述聚氧乙烯-聚氧丙烯多元共聚物可为“直链型结构”,如式(C-1)、式(C-2)所示的结构;也可为“支链型结构”,如式(C-3)、式(C-4)所示的结构。
根据本发明的数个实施例,所述聚醚型非离子表面活性剂可单独使用一种,也可同时使用多种,比如单独使用支链型结构或将直链型结构以及支链型结构两者混用。
根据本发明的数个实施例,所述聚偏氟乙烯隔离膜中的微孔洞可为指状沟槽。根据本发明的数个实施例,所述聚偏氟乙烯隔离膜的微孔洞开口的口径分布范围可为50nm~400nm,例如可为50nm、60nm、80nm、100nm、150nm、200nm、250nm、300nm、350nm、400nm等。
根据本发明的数个实施例,所述聚偏氟乙烯隔离膜中的聚醚酰亚胺颗粒的平均粒径可为100nm~20μm,例如可为100nm、200nm、300nm、400nm、500nm、600nm、700nm、800nm、900nm、1μm、3μm、5μm、10μm、20μm等。
<聚偏氟乙烯隔离膜的制造方法>
为了提升薄膜的润湿效果以及过滤时的纯水通量,本发明的聚偏氟乙烯隔离膜是透过相转换法制成。相转换法包括铸膜液配制工序以及相转换工序,以下将详细说明各工序的细节。
铸膜液配制工序
在铸膜液配制工序中,使用极性有机溶剂在高温下溶解聚偏氟乙烯与聚醚酰亚胺粉末,接着加入聚醚型非离子表面活性剂,以机械搅拌均匀后,在室温下静置一段时间并消除气泡,最终获得聚偏氟乙烯/聚醚酰亚胺铸膜液。
在铸膜液配制工序中,极性有机溶剂可以为N-甲基吡咯烷酮、二甲基亚砜、N,N-二甲基乙酰胺等能溶解聚偏氟乙烯与聚醚酰亚胺的非质子溶剂。
在铸膜液配制工序中,铸膜液需在50~90℃水浴中进行机械搅拌,搅拌转速为200~1000rpm,搅拌时间为4小时。静置时间为8小时。
相转换工序
在相转换工序中,将铸膜液涂布在支撑材上,随后浸入不同温度的凝固液30分钟,取出薄膜并干燥以得到聚偏氟乙烯隔离膜。
在相转换工序中,铸膜液的涂布方式并无特别限定,例如可使用辊涂机、狭缝涂布机、模涂机、帘幕式涂布机、喷雾涂布机、刮刀涂布机、棒涂机、气刀涂布机等,其中较佳为刮刀涂布机或狭缝涂布机。
在相转换工序中,支撑材的材质并无特别限定,支撑材主要是利于涂布工艺的施作及因应本发明的聚偏氟乙烯隔离膜后续的应用而定。支撑材在工艺结束后可能取下,也可能不取下,也即,本发明的聚偏氟乙烯隔离膜产品不一定具有支撑材。支撑材的材质例如为多孔性不织布或平滑的玻璃板、金属板等。
在相转换工序中,凝固液为不与高分子相容的溶剂,例如可列举水与醇类。凝固液的浸泡温度为20~80℃,且浸泡温度需高于铸膜液的温度,浸泡时间为1~60分钟。
在相转换工序中,薄膜的干燥温度为室温~100℃。
本发明的聚偏氟乙烯隔离膜可应用在水处理或流体过滤。此外,也可应用在电池的隔离膜。
<实施例>
以下,藉由实施例来对本发明进行更详细的说明,但本发明并不受该些例子限定。例中的“%”及“份”只要无特别记载,则为质量%及质量份。
本发明以下实施例所提及的产物特性量测仪器及方法:
聚醚酰亚胺的颗粒粒径测定
将实施例以及比较例所制得的聚偏氟乙烯隔离膜横截面以扫描式电子显微镜(Scanning electron microscope,以下简称SEM)扫描拍照,并以Image-Pro Plus软体分析所述照片的微孔洞中的聚醚酰亚胺的颗粒的粒径,而得到的最大粒径以及最小粒径作为其分布范围。图1、图3以及图5,分别为实施例2、实施例5G以及实施例6G的聚偏氟乙烯隔离膜的横截面的SEM照片,其显示所制备聚偏氟乙烯隔离膜具有微孔洞,且在微孔洞表面具有颗粒。
聚偏氟乙烯隔离膜的颗粒成份测定
利用衰减全反射傅里叶变换红外线光谱(Attenuated total reflectanceFourier transform infrared,以下简称ATR-FTIR)测定聚偏氟乙烯隔离膜的颗粒成份。因ATR-FTIR无需进行样品制备或稀释即可达到测量光谱的目的,所以适用在分析膜片的原始成分。
图7为实施例2的聚偏氟乙烯隔离膜的ATR-FTIR光谱,图8为实施例2的聚偏氟乙烯隔离膜与聚偏氟乙烯粉末以及聚醚酰亚胺粉末的ATR-FTIR光谱的比对图。1777.74cm-1以及1722.31cm-1处有吸收峰讯号,为典型的酰亚胺羰基(imide carbonyl)C=O键的不对称和对称拉伸。1359.14cm-1以及744.05cm-1的吸收峰讯号为C-N键的拉伸和弯曲,1236.26cm-1的吸收峰讯号则是芳香族醚C-O-C的讯号,综合以上能证实聚醚酰亚胺的存在。而CH2的振动讯号为1402.81cm-1,CF2与C-C的拉伸讯号分别为1182.17cm-1和875.13cm-1,综合以上能证实聚偏氟乙烯的存在。故由图7以及图8的ATR-FTIR光谱比对可认定实施例2的聚偏氟乙烯隔离膜中应含有聚偏氟乙烯以及聚醚酰亚胺。
此外,将实施例2的聚偏氟乙烯隔离膜的横截面以能量色散X-射线光谱(Energy-dispersive X-ray spectroscopy,简称EDS)搭配SEM来进行薄膜横截面结构的元素鉴定,针对颗粒处与非颗粒处分别取样,并进行元素分析。结果发现,颗粒处的试样中,相对于碳、氧、氟原子的峰值强度总和为100%而言,碳原子的峰值强度占比为82.45%,氧原子的峰值强度占比为15.60%,氟原子的峰值强度占比为1.94%。相对于此,非颗粒处的试样中,相对于碳、氧、氟原子的峰值强度总和为100%而言,碳原子的峰值强度占比为62.12%,氧原子的峰值强度占比为2.44%,氟原子的峰值强度占比为35.45%。由上述结果中认为,颗粒处的试样中,由于氟原子的含量相对较低,故可认定颗粒处的主成分应为聚醚酰亚胺;而非颗粒处的试样中,由于氧原子的含量相对较低,故可认定非颗粒处的主成分应为聚偏氟乙烯。
聚偏氟乙烯隔离膜的开口口径测定
将实施例以及比较例所制得的聚偏氟乙烯隔离膜表面以扫描式电子显微镜扫描拍照,并以Image-Pro Plus软体分析所述照片的表面的开口口径而得到最大口径以及最小口径作为其分布范围。图2、图4以及图6分别为实施例2、实施例5G以及实施例6G的聚偏氟乙烯隔离膜表面的SEM照片。
膜面接触角以及液珠消失时间的测定
对实施例以及比较例所得的聚偏氟乙烯隔离膜滴加一滴体积为1μL的纯水,并记录液滴与聚偏氟乙烯隔离膜之间的初始接触角以及从液滴被滴加聚偏氟乙烯隔离膜表面至完全消失在聚偏氟乙烯隔离膜表面上为止的时间(称为液珠消失时间)。
纯水通量的测定
将实施例以及比较例所得的聚偏氟乙烯隔离膜分别制成7cm×7cm的试验片,并在1bar的压力下进行扫流过滤。以每分钟能够通过单位面积的试验片的纯水体积作为其纯水通量。
收缩率的测定
对实施例以及比较例所得的聚偏氟乙烯隔离膜测量其长度及宽度,并以下述算式计算其MD方向上以及TD方向上的收缩率。当收缩率数值为正值时,表示所述方向上有膨胀的情形,而当收缩率数值为负值时,表示所述方向上有收缩的情形。
收缩率(%)=((L1-L0)/L0)×100%
L0:在MD/TD方向上的铸模液涂布长度
L1:在MD/TD方向上的聚偏氟乙烯隔离膜长度
本发明以下实施例及比较例所使用的化学品详细资料先说明如下:
PVDF:聚偏氟乙烯(polyvinylidene fluoride),购自Arkema,型号761,数量平均分子量约为145,000,重量平均分子量约为441,000。
PEI:聚醚酰亚胺(Polyetherimide),购自SABIC,型号Ultem 1010,重量平均分子量约为48,000。
PE10100:BASF制造的普罗尼克(Pluronic)PE 10100,重量平均分子量约为3,500。
373885:奥德里奇(Aldrich)制造的丙三醇聚氧丙烯-聚氧乙烯嵌段共聚物(Glycerol propoxylate-block-ethoxylate),重量平均分子量约为4,000。
PVP:聚乙烯吡咯烷酮(Polyvinylpyrrolidone),购自ACROS,型号K16-18,重量平均分子量约为8,000。俗称造孔剂(pore-forming agent)。
聚偏氟乙烯/聚醚酰亚胺铸膜液的制备例
制备例1
在具备搅拌装置、加液漏斗、冷凝器及温度计的烧瓶中,加入105克的N-甲基吡咯烷酮(NMP)、13.5克的聚偏氟乙烯以及13.5克的聚醚酰亚胺之后,一边进行加热一边搅拌,直至聚偏氟乙烯以及聚醚酰亚胺的粉末完全溶解,而溶液呈现乳化状。
其次,将3克的作为聚醚型非离子表面活性剂的普罗尼克(Pluronic)PE 10100溶在15ml的N-甲基吡咯烷酮中。并自滴液漏斗将上述的表面活性剂溶液滴加至前述烧瓶中。在滴加结束后,在60℃水浴中以转速500rpm搅拌4小时。然后,移除水浴并静置8小时以消除气泡,获得聚偏氟乙烯/聚醚酰亚胺铸膜液I,总重量为150g。
制备例2~8
制备例2~8是以与制备例1相同的工序来制备,其不同处在于:改变各成分的种类及其使用量(如表1所示),以获得聚偏氟乙烯/聚醚酰亚胺铸膜液II~VIII。
[表1]
聚偏氟乙烯隔离膜结构的实施例
以下说明聚偏氟乙烯隔离膜结构的实施例1至实施例12以及比较例1至比较例3:
实施例1
将制备例1所得的聚偏氟乙烯/聚醚酰亚胺铸膜液I倒入刮刀涂布机的刮刀前缘,使用幅宽18.5cm的刮刀并设定涂布机行程长度为28cm,将涂料以涂布速度30mm/s覆盖在宽24cm×长30cm的PP多孔性不织布上,并暴露在空气中约10秒钟,随后浸入30℃的水浴中30分钟,取出薄膜并在室温下干燥1天,即得到实施例1的含支撑材的聚偏氟乙烯隔离膜。接着,量测并计算所述聚偏氟乙烯隔离膜的材料组成及各种物理特性如下表2所示。
实施例2~12以及比较例1
实施例2~12以及比较例1的聚偏氟乙烯隔离膜是以与实施例1相同的工序来制备,并且其不同处在于:改变聚偏氟乙烯/聚醚酰亚胺铸膜液的材料组成及水浴温度各种物理特性,如下表2和表3所示。
实施例1G~6G以及比较例1G
实施例1G~6G以及比较例1G的聚偏氟乙烯隔离膜是以与实施例1相同的工序来制备,并且其不同处在于:以刮刀涂布机涂布在平滑玻璃板上并暴露在空气中约10秒钟,随后浸入30℃的水浴中30分钟,此时涂层会与平滑玻璃板分离,取出薄膜并在室温下干燥1天。在纵向(MD方向,即刮刀涂布机运作时的刮刀移动方向)上的涂布长度为28.0cm,在横向(TD方向,即与刮刀移动方向正交的方向)上的涂布宽度为18.5cm。获得的聚偏氟乙烯隔离膜在经过相转换工序之后成为不具备支撑材的聚偏氟乙烯隔离膜。其材料组成及各种物理特性如下表2至表4所示。
[表2]
[表3]
[表4]
由表2~表4得知,与聚偏氟乙烯的含量大于或等于聚醚酰亚胺的含量,且含有聚醚型非离子表面活性剂的聚偏氟乙烯隔离膜组合物所制得的聚偏氟乙烯隔离膜(实施例1~12)相比,未含有聚醚酰亚胺的比较例1的聚偏氟乙烯隔离膜,其收缩率高、水通量较低、润湿性均较差。
此外,当将相转换工序的水浴温度提高(实施例2、11)时,可使聚醚酰亚胺析出的粒径变大。但当聚醚型非离子表面活性剂的含量较低时,(实施例7~9),即便将水浴温度提高,聚醚酰亚胺的粒径的变化也不明显。故添加聚醚型非离子表面活性剂有助于聚醚酰亚胺固体析出,且可调控其粒径大小。
综上所述,本发明的聚偏氟乙烯隔离膜组合物含有特定比例的聚醚酰亚胺,且含有聚醚型非离子表面活性剂。因此,所制成的所述聚偏氟乙烯隔离膜可以改善先前技术存在收缩率高、水通量较低以及润湿性不佳等技术问题。
最后应说明的是:以上各实施例仅用以说明本发明的技术方案,而非对其限制;尽管参照前述各实施例对本发明进行了详细的说明,本领域的普通技术人员应当理解:其依然可以对前述各实施例所记载的技术方案进行修改,或者对其中部分或者全部技术特征进行等同替换;而这些修改或者替换,并不使相应技术方案的本质脱离本发明各实施例技术方案的范围。
Claims (11)
1.一种聚偏氟乙烯薄膜,包含聚偏氟乙烯薄膜组合物,其特征在于,所述聚偏氟乙烯薄膜组合物包括:
聚偏氟乙烯;
聚醚酰亚胺;以及
聚醚型非离子表面活性剂,
其中,所述聚偏氟乙烯与所述聚醚酰亚胺的重量比为1:1~19:1,
相对于所述聚偏氟乙烯薄膜组合物的总重量为100%而言,所述聚醚型非离子表面活性剂的重量百分比为0.1%~10%;
所述聚偏氟乙烯薄膜中的聚醚酰亚胺为颗粒状,所述颗粒的平均粒径为100nm~20μm;
所述聚醚型非离子表面活性剂为聚氧乙烯-聚氧丙烯多元共聚物。
2.根据权利要求1所述的聚偏氟乙烯薄膜,其中
所述聚偏氟乙烯的重量平均分子量为200,000~1,000,000。
3.根据权利要求1所述的聚偏氟乙烯薄膜,其中
所述聚偏氟乙烯的重量平均分子量为400,000~600,000。
4.根据权利要求1所述的聚偏氟乙烯薄膜,其中
所述聚醚酰亚胺的重量平均分子量为20,000~100,000。
5.根据权利要求1所述的聚偏氟乙烯薄膜,其中
所述聚醚酰亚胺的重量平均分子量为40,000~60,000。
6.根据权利要求1所述的聚偏氟乙烯薄膜,其中
所述聚氧乙烯-聚氧丙烯多元共聚物的重量平均分子量为1,000~10,000。
7.根据权利要求6所述的聚偏氟乙烯薄膜,其中
所述聚氧乙烯-聚氧丙烯多元共聚物具有如下述式C-1至式C-4所示的结构中的至少一种:
式C-1至式C-4中,a1~a9表示氧亚丙基的平均重复数,为1~100的数,b1~b10表示氧亚乙基的平均重复数,为1~100的数。
8.根据权利要求1所述的聚偏氟乙烯薄膜,其中
所述聚醚型非离子表面活性剂为支链型结构。
9.一种聚偏氟乙烯隔离膜,其特征在于,包括:
权利要求1所述的聚偏氟乙烯薄膜;
多个微孔洞,分散在所述聚偏氟乙烯薄膜中,且在所述聚偏氟乙烯薄膜的表面形成开口,
其中,聚醚酰亚胺颗粒分布在所述微孔洞的表面。
10.根据权利要求9所述的聚偏氟乙烯隔离膜,其中
所述开口的口径分布范围为50nm~400nm。
11.根据权利要求9所述的聚偏氟乙烯隔离膜,其中
所述微孔洞为指状沟槽。
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