CN112312998A - 使用过滤膜分离有机锌催化剂的方法 - Google Patents
使用过滤膜分离有机锌催化剂的方法 Download PDFInfo
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- CN112312998A CN112312998A CN201980039877.2A CN201980039877A CN112312998A CN 112312998 A CN112312998 A CN 112312998A CN 201980039877 A CN201980039877 A CN 201980039877A CN 112312998 A CN112312998 A CN 112312998A
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- Prior art keywords
- polyalkylene carbonate
- catalyst
- carbonate resin
- filtration membrane
- containing material
- Prior art date
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Abstract
本发明涉及通过过滤聚碳酸亚烷基酯树脂溶液来分离分散在聚碳酸亚烷基酯树脂溶液中的有机锌催化剂的方法。当使用根据本发明的用于分离有机锌催化剂的方法时,有机锌催化剂颗粒被有效地从聚碳酸亚烷基酯树脂溶液中去除,从而可以获得透明的高纯度聚碳酸亚烷基酯溶液。
Description
技术领域
相关申请的交叉引用
本申请要求于2018年12月19日向韩国知识产权局提交的韩国专利申请第2018-0165219号的权益,其全部内容通过引用并入本文。
技术领域
本发明涉及通过过滤聚碳酸亚烷基酯树脂溶液来分离分散在聚碳酸亚烷基酯树脂溶液中的有机锌催化剂的方法。
背景技术
塑料由于易于制造和使用方便而被用作各种物品的原料,其不仅用于诸如包装膜、一次性杯子和一次性餐具之类的一次性物品,而且还用于建筑材料和汽车内饰材料的各种领域。随着塑料用量的增加,塑料废料的量也增加,并且由于大多数塑料在自然环境中不会分解,因此主要通过焚烧处理塑料废料。然而,焚烧引起诸如有毒气体的环境污染问题。最近,已经开发了在自然环境中自然分解的可生物降解塑料。
可生物降解的塑料是由于其化学结构而在水中缓慢分解的塑料,在诸如土壤或海水的潮湿环境中,可生物降解的塑料在几周内开始分解,并在一到几年内消失。此外,可生物降解塑料的降解产物对环境的危害较小,这是因为它们被分解为无害的成分,例如水或二氧化碳。
特别是,最近,通过环氧化物与二氧化碳聚合获得的聚碳酸亚烷基酯树脂作为一种可生物降解的树脂引起了广泛的关注。聚碳酸亚烷基酯是无定形的透明树脂,与类似系列的工程塑料芳香族聚碳酸酯不同,它仅具有脂肪族结构,并且是在催化剂的存在下通过二氧化碳和环氧化物作为直接单体(主要原料)的共聚反应而合成的。聚碳酸亚烷基酯具有优异的透明性、伸长率和氧阻隔性能,表现出可生物降解的性质,并且具有在燃烧过程中完全分解成二氧化碳和水且不留下碳残留物的优点。
已经研究了制备聚碳酸亚烷基酯树脂的各种方法,特别是有机锌催化剂,例如戊二酸锌催化剂(该催化剂是金属有机骨架(MOF)系列中用于二氧化碳塑料聚合的催化剂,其中锌和二羧酸键合),作为环氧化物与二氧化碳的共聚反应的代表性催化剂而被广泛知晓。
有机锌催化剂通过锌前体与二羧酸(例如戊二酸)反应而形成,并呈细结晶颗粒的形式。由于这种细结晶颗粒的形式,在溶液中完成了聚碳酸亚烷基树脂聚合反应之后,有机锌催化剂均匀地分散在聚合溶液中,因此,其局限性在于,由于有机锌催化剂粒径小而难以使用常规过滤器或离心法将其分离。
为了有效地分离均匀地分散在聚碳酸亚烷基酯树脂溶液中的有机锌催化剂,开发了一种方法,其中使用过滤器或凝结剂来凝结有机锌催化剂,然后分离凝结的催化剂。然而,由于有机锌催化剂不仅具有小的粒径而且具有柔软的形状,因此简单地调节孔径的物理分离方法具有局限性。
因此,需要开发一种技术,采用该技术可以经济且有效地分离微细分散在溶液中的有机锌催化剂而不污染聚碳酸亚烷基酯树脂。
[现有技术文献]
[专利文献]
(专利文献1)KR 10-2018-0043681 A
发明内容
技术问题
本发明的一方面提供了一种方法,该方法通过使用复合过滤膜,经济有效地分离分散在聚碳酸亚烷基酯树脂溶液中的有机锌催化剂,所述复合过滤膜由含羟基的材料和聚烯烃的复合材料构成并且具有其中聚烯烃被所述含羟基的材料涂覆的形式。
技术方案
根据本发明的一个方面,提供了一种用于分离有机锌催化剂的方法,该方法包括向复合过滤膜中添加含有聚碳酸亚烷基酯树脂和有机锌催化剂的聚碳酸亚烷基酯树脂溶液,其中,所述复合过滤膜是包括含羟基的材料和聚烯烃的复合材料,并且具有聚烯烃的一个或两个表面被所述含羟基的材料涂覆的形式。
有益效果
当使用所述分离有机锌催化剂的方法时,有机锌催化剂颗粒被有效地从聚碳酸亚烷基酯树脂溶液中除去,从而可以获得透明的高纯度聚碳酸亚烷基酯溶液。
另外,由于即使在没有另外的添加剂(例如二氧化硅或硅藻土)的情况下也可以除去有机锌催化剂,因此即使不污染聚碳酸亚烷基酯树脂溶液也可以简单容易地除去有机锌催化剂。
此外,通过使用容易以低成本获得的过滤膜可以提高经济可行性,并且由于即使在过滤过程中过滤膜也不会变形,并且可以容易地去除在过滤膜表面上形成的滤饼,可以方便地重复使用过滤膜。
附图说明
图1示出了根据本发明的实施例和比较例在除去有机锌催化剂之后的聚碳酸亚烷基酯树脂溶液。
具体实施方式
在下文中,将更详细地描述本发明以帮助理解本发明。
将理解的是,说明书和权利要求书中使用的词或术语不应解释为常用词典中定义的含义。将进一步理解的是,基于发明人可以适当地定义词或术语的含义以便最好地解释本发明的原则,词或术语应被解释为具有与其在相关领域的背景和本发明的技术思想中的含义一致的含义。
本发明的主要目的是以这样一种方式最终获得高纯度的聚碳酸亚烷基酯,在有机锌催化剂存在下通过二氧化碳和环氧化物的聚合反应形成聚碳酸亚烷基酯树脂,然后有效分离微细分散在聚碳酸亚烷基酯树脂溶液中的有机锌催化剂。
有机锌催化剂不具有坚硬的陶瓷结构,而具有类似柔软质地的海绵的形式,因此在聚亚烷基碳酸酯树脂溶液中容易变形。因此,使用具有比粒径小的孔的过滤膜的简单的物理分离方法具有局限性。同时,有机锌催化剂表现出亲水性,而包含在聚碳酸亚烷基酯树脂溶液中的溶剂、聚碳酸亚烷基酯聚合物、其他副产物等具有疏水性。
本发明的特征在于,不通过简单地调节过滤膜的孔径来物理收集有机锌催化剂,而是通过选择含羟基的材料作为过滤膜的材料以使有机锌催化剂和过滤膜相互作用从而有效地从聚碳酸亚烷基酯树脂溶液中分离有机锌催化剂。
另外,考虑到含羟基的材料具有与有机锌催化剂强相互作用的优点,但是由于高吸湿性而抗变形性弱而使过滤膜的物理性能劣化,通过使用具有聚烯烃用作载体而涂覆有含羟基的材料的形式的复合过滤膜来实现有机锌催化剂的分离效率和复合过滤膜的稳定性。
在下文中,将详细描述本发明。
有机锌催化剂的分离方法
本发明提供一种用于分离有机锌催化剂的方法,该方法包括向复合过滤膜中添加包含聚碳酸亚烷基酯树脂和有机锌催化剂的聚碳酸亚烷基酯树脂溶液,其中所述复合过滤膜为复合材料,其包括含羟基的材料和聚烯烃并且具有聚烯烃的一个或两个表面涂覆有含羟基的材料的形式。
在本发明中,有机锌催化剂可以颗粒状态分散在聚碳酸亚烷基酯树脂溶液中。
由于包含在聚碳酸亚烷基酯树脂溶液中的聚碳酸亚烷基酯与有机锌催化剂之间的相互作用,因此有机锌催化剂以颗粒状态均匀地分散在聚碳酸亚烷基酯树脂溶液中。因此,常规的有机锌催化剂分离方法难以分离以细颗粒形状分散的有机锌催化剂,特别是当使用由单一材料例如金属或聚烯烃构成的过滤膜时,常规的有机锌催化剂分离方法的问题在于,由于聚碳酸亚烷基酯和有机锌催化剂之间的相互作用,有机锌催化剂不能被有效地收集到过滤膜上,因此,即使经历了过滤过程,也只获得了有机锌催化剂仍然残留的不透明的聚碳酸亚烷基酯树脂溶液。
根据本发明的一个实施方式,通过使用复合过滤膜(其为含羟基的材料和聚烯烃的复合材料的材料),以颗粒状态分散在聚碳酸亚烷基酯聚合溶液中的有机锌催化剂不是简单地利用孔径而被物理过滤掉的,而是通过利用复合过滤膜中的羟基和有机锌催化剂中的锌离子之间的相互作用将有机锌催化剂强力收集到过滤膜上,从而可以更有效地分离微细分散在溶液中的有机锌催化剂。
复合过滤膜的材料是含羟基的材料和聚烯烃的复合材料。具体地,当使用含羟基的材料作为过滤膜的单一组分时,可能存在以下问题:复合过滤膜由于高吸湿性而抵抗水引起的变形能力弱,使得复合过滤膜的机械性质(如强度)降低,因此,本发明的复合过滤膜由包括含羟基的材料和聚烯烃的复合材料构成。另外,由于聚烯烃用作载体,所以可以提高复合过滤膜的强度,并且可以最大程度地增加含羟基的材料的表面积,从而可以增加与有机锌催化剂接触的可能性,可以更积极地诱导含羟基的材料与有机锌催化剂之间的相互作用,由此,可以进一步提高有机锌催化剂的分离效率。
也就是说,在本发明中,为了同时达到与有机锌催化剂的相互作用和优异的机械性能,将含羟基的材料与聚烯烃混合并用作复合过滤膜的材料,因此,在将有机锌催化剂有效地限制在复合过滤膜中的同时,可以防止复合过滤膜的结构变形,并且可以提高过滤过程的稳定性。
所述含羟基的材料可以是选自纤维素、玻璃纤维、羟丙基纤维素、聚乙烯醇、二氧化硅和氧化铝中的一种或多种。二氧化硅和氧化铝是金属氧化物,并且在其表面上包括含羟基的材料,具体地,硅醇(SiOH)存在于二氧化硅的表面上而铝醇(AlOH)存在于氧化铝的表面上。
纤维素是分子式为(C6H10O5)n的材料,其是高等植物细胞壁的主要组成成分,并且是含有高含量的羟基(-OH)的多糖化合物。纤维素可通过引起与有机锌催化剂的强相互作用,例如氢键而有效地捕获有机锌催化剂,因此可被有利地用作复合过滤膜的一种组分。
玻璃纤维是由玻璃细细拉制的像纤维一样的材料,并且包含高含量的羟基,因此,其以与纤维素相同的方式通过与有机锌催化剂的相互作用而具有能够有效分离有机锌催化剂的特性。
聚烯烃可以是,但不限于,由选自以下各项中的一种或多种形成的膜或无纺布:高密度聚乙烯、低密度聚乙烯、线性低密度聚乙烯、超高分子量聚乙烯、聚丙烯、聚丁烯、聚戊烯、聚丙烯聚对苯二甲酸乙二酯、聚对苯二甲酸丁二酯、聚酯、聚缩醛、聚酰胺、聚碳酸酯、聚酰亚胺、聚醚醚酮、聚醚砜、聚苯醚、聚苯硫醚(polyphenylenesulfidro)和聚乙烯萘。为了本发明的目的,所述聚烯烃可以是由聚丙烯构成的无纺布。
特别地,本发明的构成复合过滤膜的复合材料是含羟基的材料,并且可以是使用纤维素作为含羟基的材料并且使用聚丙烯作为聚烯烃的复合材料,上述两种材料的组合可以有利地用于所述复合过滤膜。
复合过滤膜具有其中聚烯烃的一个表面或两个表面涂覆有含羟基的材料的形式。
如上所述,在本发明的复合过滤膜中,使用了包括含羟基的材料和聚烯烃的复合材料,并且不是将两种材料简单地混合,而是具有其中聚烯烃被含羟基的材料涂覆的形式。现有的其中聚烯烃和含羟基的材料均匀混合的复合过滤膜无法显示过滤特性,并且可能具有不易用作过滤膜的问题。
根据本发明的复合过滤膜可以是,但不限于,由水刺布(spunlace)、纺粘布(spunbond)、熔喷布(meltblown)、共成型材料(coform)、气流成网材料(airlaid)或其组合构成的材料。
另外,所述含羟基的材料可以以10μm至10mm的厚度涂覆,并且具体地,可以以10μm至1000μm的厚度涂覆。当将含羟基的材料涂覆在聚烯烃的两个表面上时,该厚度可以表示两个表面之一上的涂层的厚度。另外,可以存在含羟基的材料的涂层,使得整个复合过滤膜的每单位面积的重量为50至1,000g/m2,同时满足所述厚度,但是本发明不限于这些实施方式。
在包括含羟基的材料和聚烯烃的复合材料中,含羟基的材料和聚烯烃的重量比可以为1:0.1至1:10,并且有利地为1:0.1至1:5,或1:0.15至1:2。
当聚烯烃含量小至超出所述重量比范围时,过滤膜的物理性质和强度降低,并且可能出现过滤膜由于小的冲击或外部刺激而容易变形的问题,而当聚烯烃含量过多超出所述重量比范围时,过滤膜的亲水性不足,因此不能有效地分离有机锌催化剂。
在本发明中,有机锌催化剂可以包括基于二羧酸锌的化合物。具体地,基于二羧酸锌的化合物可以包括C3-C20脂肪族二羧酸盐的锌盐或C8-C40芳香族二羧酸盐的锌盐。
C3-C20脂肪族二羧酸盐包括戊二酸盐、丙二酸盐、琥珀酸盐、己二酸盐等,C8-C40芳香族二羧酸盐包括对苯二甲酸盐、间苯二甲酸盐、高邻苯二甲酸盐、苯基戊二酸盐等,并且在有机锌催化剂的活性等方面,可以有利地使用戊二酸锌,但本发明不限于这些实施方式。
二羧酸盐衍生自与其对应的二羧酸,例如,C3-C20脂肪族二羧酸,如戊二酸、丙二酸、琥珀酸或己二酸,或C8-C40芳香族二羧酸,如对苯二甲酸,间苯二甲酸,高邻苯二甲酸或苯基戊二酸,并且可以通过这些二羧酸与锌的反应形成。
在本发明中,聚碳酸亚烷基酯树脂溶液的粘度可以为10-10,000cP,有利地为10-5,000cP,并且更有利地为50-300cP。
粘度表示表现出流体流动困难程度的量,即,表示粘性程度,并且由于聚碳酸亚烷基酯树脂溶液的粘度,变得更加难以将有机锌催化剂与溶液分离,聚碳酸亚烷基酯树脂溶液的粘度越高,这种现象越严重。
根据本发明的实施方式,即使聚碳酸亚烷基酯树脂溶液的粘度为如上所述的高数值,由于过滤膜与有机锌催化剂之间的强相互作用,也可以有效地从溶液中分离有机锌催化剂。
在本发明中,复合过滤膜的平均孔径可以为0.1-10μm,有利地为1-10μm,并且更有利地为1-5μm。
有机锌催化剂具有纳米级的粒度,但是催化剂颗粒以聚集体的形式存在于介质中,因此,形成直径增大以及表面积减小的聚集体。聚集体的平均粒径可以是,但不限于,1-100μm,10-90μm或50-80μm。
本发明中的过滤膜的平均孔径不由使用比有机锌催化剂的颗粒小的孔径以便收集颗粒来确定,而是完全考虑有机锌催化剂和过滤膜之间的相互作用,其他副产物的大小以及由于减小孔径而增加的膜间压差而确定的。当过滤膜的孔径不过分大于聚集体的平均粒径时,其他副产物有效地通过过滤膜的孔,与此同时,由于有机锌催化剂和过滤膜之间的相互作用而捕获有机锌催化剂。
根据本发明的实施方式,使用了平均孔径经调节的过滤膜。因此,不仅可以防止压差的过度增加,而且由于有机锌催化剂与过滤膜之间的相互作用,还可以有效地收集有机锌催化剂。
当过滤膜的平均孔径小于0.1μm时,分离小尺寸有机锌催化剂的可能性增加,但是膜间压差(△P)增加,而当过滤膜的平均孔径大于10μm时,则可能出现小尺寸的有机锌催化剂和其他副产物通过过滤膜的问题。
另外,当在本发明中使用复合过滤膜时,可以在将聚碳酸亚烷基酯树脂溶液加至复合过滤膜的过程中施加1-10巴,2-8巴或2-4巴的压力以进行过滤。
用于生产聚碳酸亚烷基酯树脂的方法
另外,本发明提供一种制备聚碳酸亚烷基酯树脂的方法,该方法包括:在有机锌催化剂的存在下,使二氧化碳和包括环氧化合物的单体聚合;以及通过使用根据本发明的分离有机锌催化剂的方法除去有机锌催化剂,得到聚碳酸亚烷基酯树脂。
在二氧化碳与包括环氧化合物的单体的聚合中,可以非均相催化剂的形式使用有机锌催化剂,并且可以在溶液中以液相聚合进行聚合。
作为液相聚合中使用的溶剂,可以使用二氯甲烷、二氯乙烷、三氯乙烷、四氯乙烷、氯仿、乙腈、丙腈、二甲基甲酰胺、N-甲基-2-吡咯烷酮、二甲基亚砜、硝基甲烷、1,3-二氧戊环、1,4-二噁英、己烷、甲苯、四氢呋喃、甲基乙基酮、甲胺酮、甲基异丁基酮、丙酮、环己酮、三氯乙烯、乙酸甲酯、乙酸乙烯酯、乙酸乙酯、乙酸丙酯、丁内酯、己内酯、硝基丙烷、苯、苯乙烯、二甲苯、丙二醇甲醚或它们中两种以上的混合物,并且有利地使用二氯甲烷或二氯乙烷作为溶剂,从而可以更有效地进行聚合,但是本发明不限于这些实施方式。
环氧化合物可以是,但不限于,选自以下各项中的一种或多种:未取代的或被卤素或C1-C5烷基取代的C2-C20环氧烷烃,未取代的或被卤素或C1-C5烷基取代的C4-C20环氧环烷烃(cycloalkylene oxide),以及未取代的或被卤素或C1-C5烷基取代的C8-C20苯乙烯氧化物。
未取代的或被卤素或C1-C5烷基取代的C2-C20环氧烷烃的具体实例包括但不限于环氧乙烷、环氧丙烷、环氧丁烷、环氧戊烷、环氧己烷、环氧辛烷、环氧癸烷、十二碳烯氧化物、十四碳烯氧化物、十六碳烯氧化物、十八碳烯氧化物、丁二烯一氧化物、1,2-环氧-7-辛烷、表氟醇、表氯醇、表溴醇、异丙基缩水甘油醚、丁基缩水甘油醚、叔丁基缩水甘油醚、2-乙基己基缩水甘油醚、烯丙基缩水甘油醚等。
未取代的或被卤素或C1-C5烷基取代的C4-C20环氧环烷烃的具体实例包括但不限于环氧环戊烷、环氧环己烷、环氧环辛烷、环氧环十二烷、α-蒎烯氧化物、2,3-环氧降冰片烯、氧化柠檬烯、狄氏剂等。
未取代的或被卤素或C1-C5烷基取代的C8-C20苯乙烯氧化物的具体实例包括但不限于2,3-环氧丙基苯、氧化苯乙烯、苯基环氧丙烷、氧化二苯乙烯、氯二苯乙烯氧化物、二氯二苯乙烯氧化物、1,2-环氧-3-苯氧基丙烷、苄氧基甲基环氧乙烷、缩水甘油基甲基苯基醚、氯苯基-2,3-环氧丙基醚、环氧丙基甲氧基苯基醚、联苯基缩水甘油醚、缩水甘油基萘基醚等。
此外,用于聚合二氧化碳和包括环氧化物的单体的方法和工艺条件可以使用但不限于用于生产聚碳酸亚烷基酯树脂的一般聚合条件。
实施例
在下文中,将通过实施例更详细地描述本发明。然而,以下实施例仅用于说明本发明,本发明的范围不限于这些实施例。
实施例1
1)聚碳酸亚烷基酯树脂的制备
使用二氧化碳和环氧乙烷作为反应物和有机锌催化剂合成聚碳酸亚烷基酯树脂溶液。在下面的实验中使用含有聚碳酸亚烷基酯树脂、有机锌催化剂等的合成的聚碳酸亚烷基酯树脂溶液。
2)有机锌催化剂的分离
将由其中聚丙烯被纤维素涂覆的纤维素-聚丙烯复合材料(纤维素与聚丙烯的重量比为1:0.05)构成的复合过滤膜(平均孔径为3μm)附着在内径为50mm的圆形压滤室的两个表面上,然后开始过滤聚碳酸亚烷基酯树脂溶液。在将用于将溶液注入压滤室的泵的压力从2巴变为4巴的同时进行过滤,将过滤过的溶液倒入250ml玻璃瓶中,然后检查流速和透明度。另外,为了检查催化剂的剩余量,进行电感耦合等离子体(ICP)元素(Zn)分析。
实施例2至11
除了如下表1所示改变实验条件之外,进行与实施例1中相同的实验。
比较例1
将由金属(SUS 316)构成的过滤膜(平均孔径为3μm)附着至过滤器壳体,然后开始过滤聚碳酸亚烷基酯树脂溶液。在将施加到过滤器壳体的压力增至最高7巴的同时进行过滤,将过滤过的溶液倒入250mL玻璃瓶中,然后检查流速和透明度。另外,为了检查催化剂的剩余量,进行电感耦合等离子体(ICP)元素分析。
比较例2至4
除了如下表1所示改变实验条件之外,进行与实施例1中相同的实验。
[表1]
实验例1
图1示出了通过肉眼观察如上所述获得的聚碳酸亚烷基酯树脂溶液而获得的结果,聚碳酸亚烷基酯树脂溶液中残留的Zn含量列于表2中。
[表2]
如表2所示,在根据本发明分离有机锌催化剂的实施例的情况下,证实了与比较例相比,有效分离了有机锌催化剂,因此,残留在树脂溶液中的Zn离子的含量非常低。
具体地,如图1所示,在通过使用根据本发明的纤维素(80%)和聚丙烯(20%)的复合材料过滤器去除有机锌催化剂的实施例2中,证实了有机锌催化剂被有效地除去并且呈现透明状态。另一方面,在使用金属过滤器的比较例1中,不能有效地除去微细分布的有机锌催化剂,由此,可以看出即使与聚亚烷基碳酸酯树脂相比,透明度也没有明显提高。
另外,在实施例1中,证实了过滤后残留的锌含量非常低,并且有效地分离了有机锌催化剂,但是由于聚烯烃含量低,复合过滤膜的稳定性降低,并且在复合过滤膜部分变形之后,由于渗透的有机锌催化剂,测得Zn含量高。另外,与其他反应条件相同的实施例2相比,在过滤期间压力增加至大于4巴的实施例3却显示过滤能力略有降低。
在实施例6中,由于复合过滤膜0.04μm的小孔径,有机锌催化剂被很好地分离,但是确定的是,由于可渗透的树脂溶液的量由于小孔径而不可避免地少,经济可行性和效率均较低。另外,在玻璃纤维为含羟基的材料的实施例8和9,以及将聚乙烯用作聚烯烃的实施例10和11中,确认了有机锌催化剂的有效分离结果。
另一方面,可以看出,在使用金属作为过滤膜的比较例1中,在使用未涂覆有含羟基材料的过滤膜的比较例2和3中,以及在纤维素未被涂覆而是与聚丙烯均匀混合以用作过滤膜的比较例4中,没有有效地进行有机锌催化剂的分离。
Claims (13)
1.一种用于分离有机锌催化剂的方法,所述方法包括:
向复合过滤膜中添加含有聚碳酸亚烷基酯树脂和有机锌催化剂的聚碳酸亚烷基酯树脂溶液,
其中,所述复合过滤膜是包括含羟基的材料和聚烯烃的复合材料,并且具有所述聚烯烃的一个或两个表面被所述含羟基的材料涂覆的形式。
2.根据权利要求1所述的方法,其中,所述含羟基的材料是选自纤维素、玻璃纤维、羟丙基纤维素、聚乙烯醇、二氧化硅和氧化铝中的一种或多种。
3.根据权利要求1所述的方法,其中,所述聚烯烃是由选自以下各项中的一种或多种形成的膜或无纺布:高密度聚乙烯、低密度聚乙烯、线性低密度聚乙烯、超高分子量聚乙烯、聚丙烯、聚丁烯、聚戊烯、聚丙烯聚对苯二甲酸乙二酯、聚对苯二甲酸丁二酯、聚酯、聚缩醛、聚酰胺、聚碳酸酯、聚酰亚胺、聚醚醚酮、聚醚砜、聚苯醚、聚苯硫醚和聚乙烯萘。
4.根据权利要求1所述的方法,其中,所述有机锌催化剂包括基于二羧酸锌的化合物。
5.根据权利要求4所述的方法,其中,所述基于二羧酸锌的化合物包括C3-C20脂肪族二羧酸盐的锌盐或C8-C40芳香族二羧酸盐的锌盐。
6.根据权利要求1所述的方法,其中,所述含羟基的材料以10μm至10mm的厚度涂覆。
7.根据权利要求1所述的方法,其中,所述聚烯烃和所述含羟基的材料的重量比为1:0.1至1:10。
8.根据权利要求1所述的方法,其中,所述复合过滤膜的平均孔径为0.1-10μm。
9.根据权利要求1所述的方法,其中,在所述添加中,施加1-10巴的压力。
10.根据权利要求1所述的方法,其中,所述有机锌催化剂以颗粒状态分散在所述聚碳酸亚烷基酯树脂溶液中。
11.根据权利要求1所述的方法,其中,所述聚碳酸亚烷基酯树脂溶液的粘度为10-10,000cP。
12.一种用于制备聚碳酸亚烷基酯树脂的方法,所述方法包括:
在有机锌催化剂的存在下,使二氧化碳和包括环氧化合物的单体聚合来制备包含聚碳酸亚烷基酯树脂和有机锌催化剂的聚碳酸亚烷基酯树脂溶液;以及
使用根据权利要求1至11中任一项所述的方法分离所述有机锌催化剂。
13.根据权利要求12所述的方法,其中,所述环氧化合物是选自以下各项中的一种或多种:
未取代的或被卤素或C1-C5烷基取代的C2-C20环氧烷烃;
未取代的或被卤素或C1-C5烷基取代的C4-C20环氧环烷烃;以及
未取代的或被卤素或C1-C5烷基取代的C8-C20氧化苯乙烯。
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