CN113106786A - 一种多层复合的固态、半固态电解电容器隔膜纸及其制备方法和应用 - Google Patents
一种多层复合的固态、半固态电解电容器隔膜纸及其制备方法和应用 Download PDFInfo
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Abstract
本发明公开了一种多层复合的固态、半固态电解电容器隔膜纸及其制备方法和应用,其中该隔膜纸包含耐热层,可以有效改善隔膜纸的耐热性,该层的纤维具有较高的熔点,实现了对隔膜整体耐热性的增强;通过对纤维的尺寸的限定,实现了对隔膜纸孔径的有效控制,同时也通过调整隔膜纸的孔隙结构,使导电高分子可以在隔膜中均匀形成,另外,还包含基底层,通过使用双组分粘结纤维来增加强度,为隔膜纸提供了必要的物理强度,该层纤维之间的孔径较大,孔隙率较高,保证了浸渍液的吸收量,可广泛应用于固态、半固态电解电容器中,具有低ESR性能。
Description
技术领域
本发明涉及铝电解电容器隔膜纸技术领域,更具体地,涉及一种多层复合的固态、半固态电解电容器隔膜纸及其制备方法和应用。
背景技术
通用型的铝电解电容器的基本结构是箔式卷绕型的结构,阴极为铝金属箔,介质使用电化学方法在阳极金属箔表面上形成的阀金属氧化膜Al2O3,阴极则为多孔性电解纸所吸附的工作电解质。由于其体积较小,被广泛应用于电源电路或中频、低频电路中起电源滤波、退耦、信号耦合及时间常数设定、隔直流等作用。固态、半固态电解电容器通过卷绕型来满足更高的容量需求,即将阴极铝箔、阳极铝箔、隔膜纸卷绕成芯子,然后在真空作用下,浸渍导电高分子分散液或单体和氧化剂的混合液,将芯子密封在铝或合成树脂制成的壳体中制成固态、半固态电解电容器。
固态、半固态电解电容器具有宽工作温度范围、小尺寸、低等效串联电阻(以下称为“ESR特性”)和高纹波电流电阻等特性。因此,它适用于需要高速响应和高纹波电流的设备。固态、半固态电解电容器的生产要经过干燥、固化、回流焊等高温环节,温度高达近280℃,对电容器的耐热性提出了严格要求。因此,固态、半固态电解电容器在用作电路部件的设备中受到限制。在这种背景下,为了实现电气/电子设备的小型化和高性能,主要的问题是在保持固体电解电容器的低ESR的同时,提高其耐热(大于280℃)性能。
为了提升固态、半固态电解电容器耐高温的性能,就要相对应地提高其组成部件的耐热性,尤其是附着导电聚合物隔膜纸的耐热性。针对这个问题,可以通过选用熔点较高的纤维来替换低熔点纤维来实现,然而采用尺寸较大的耐热纤维,会导致隔膜的孔径较大,孔径分布不均匀。为了在提高隔膜耐热性的同时,可以将纤维原纤化,进而起到改善隔膜孔隙结构的作用,使隔膜的孔径分布均匀,因此,使用具有一定耐热性的超细纤维是改善隔膜纸的耐热性的有效方法,目前普遍的做法是将超细纤维混合PET、尼龙等纤维制成无纺布来克服这个问题并增强隔膜纸的耐热性,如中国专利CN108074744A公开了一种铝电解电容器用隔膜纸以及铝电解电容器,其中隔膜纸至少具有一层不织布层,所述不织布层含有20wt%以上的合成纤维,压缩保液率为130%以上,纤维长度为0.05mm以上且小于0.2mm的微细纤维的含有比例在0.1~8.0%的范围内。但这种隔膜纸基本都是单层,对隔膜纸的耐热性能改善效果不明显,即使直接复合多层使用,层与层之间的粘结性能也较差,仍然不能很好的改善隔膜纸的耐热性。
发明内容
本发明要解决的技术问题是克服现有固态、半固态电解电容器隔膜纸耐热性较差的缺陷和不足,提供一种多层复合的固态、半固态电解电容器隔膜纸,隔膜纸至少包含耐热层和基底层,复合层间粘结好,且很好地改善了隔膜纸耐热性,纤维之间的孔径较大,孔隙率较高,保证了浸渍液的吸收量,隔膜纸吸液性较好。
本发明的又一目的是提供一种多层复合的固态、半固态电解电容器隔膜纸的制备方法。
本发明的另一目的是提供一种多层复合的固态、半固态电解电容器隔膜纸的应用。
本发明上述目的通过以下技术方案实现:
一种多层复合的固态、半固态电解电容器隔膜纸,至少包括两层,第一层为耐热层,第二层为基底层,所述耐热层的紧度为0.2~0.7g/m3,所述基底层的紧度为0.2~0.7g/m3;所述耐热层包括10wt%~100wt%的合成纤维和0wt%~90wt%的植物纤维;所述基底层包括0wt%~20wt%的植物纤维和20wt%~100wt%的合成纤维,所述耐热层和基底层的植物纤维长度0.1~10mm,合成纤维长度0.1~10mm,其中基底层的合成纤维中含有20wt%~50wt%双组分合成纤维;所述双组分合成纤维包括低熔点纤维组分和高熔点纤维组分。
本发明提供的固态、半固态电解电容器隔膜纸具有多层复合结构,其中至少包含耐热层和基底层,分别采用特定的纤维材料制得耐热层和基底层,其中耐热层包含合成纤维,具有良好的耐热作用,多层复合结构保证了材料的机械强度,另外,基底层中还包含了双组分合成纤维,其中双组分合成纤维具体包括了低熔点纤维组分和高熔点纤维组分,在隔膜纸成形后,在干燥工段,干燥温度高于低熔点组分的熔点,低熔点组分开始融化,可以粘结其他基底层的纤维和耐热层的纤维,并且进一步在后续的压网作用下,耐热层和基底层的接触面可以实现良好的粘结。双组分纤维具有芯鞘结构,皮层熔点较低,在一定的温度下融化并粘结其他纤维,芯层为高熔点纤维,皮层融化后,芯层和单组份纤维的作用相同,作为构成隔膜的主体纤维。
优选地,所述耐热层中的合成纤维为碳纤维、玻璃短纤、玻璃棉、氧化铝纤维、陶瓷纤维、芳纶纤维、PBO纤维、丙烯酸纤维、聚酯纤维、尼龙纤维、维尼纶纤维、全芳族聚酰胺、半芳族聚酰胺纤维、聚酰胺酰亚胺纤维、聚醚醚酮纤维、聚苯硫醚纤维、聚氯乙烯纤维、聚偏二氯乙烯纤维、聚醚纤维、聚乙烯基醚纤维、聚乙烯基酮纤维、聚醚醚酮纤维、二烯纤维、聚氨酯纤维、聚苯硫醚纤维中的一种或几种。
优选地,所述耐热层中的植物纤维为阔叶木纤维、针叶木纤维、丝光纤维、棉纤维、麻纤维、竹纤维、草纤维、溶剂纺丝的植物纤维、棉短绒中的一种或几种。
优选地,所述基底层中的植物纤维为PET纤维、PE纤维、玻纤、PPS纤维、PPTA纤维、PVA纤维、PVOH纤维、尼龙纤维、黏胶纤维、天丝纤维、铜氨纤维中的一种或几种中的一种或几种。
优选地,所述耐热层和基底层的植物纤维长度0.2~5mm,合成纤维长度1~5mm,纤度为0.1~5dtex。
优选地,所述基底层中的合成纤维为PET纤维、PE纤维、玻纤、PPS纤维、PPTA纤维、PVA纤维、PVOH纤维、尼龙纤维、黏胶纤维、天丝纤维、铜氨纤维中的一种或几种。
优选地,所述双组分合成纤维中的低熔点纤维组分的熔点为60~1300℃,高熔点纤维组分的熔点为160~2600℃。
优选地,所述双组分合成纤维为聚苯二甲酸乙二酯复合纤维(Co-PET)、聚丙烯/聚乙烯(PP/PE)复合纤维、聚对苯二甲酸乙二酯/聚丙烯(PET/PP)复合纤维或聚对苯二甲酸乙二酯/聚乙烯(PET/PE)复合纤维中的一种或几种。
本发明保护上述多层复合的固态、半固态电解电容器隔膜纸的制备方法,包括如下步骤:
将耐热层的纤维原料加水疏解分散制成第一浆料,将基底层的纤维原料分散均匀,得到第二浆料,将两种浆料分别上网脱水成形,再经过压榨、干燥、喷雾涂布或浸渍涂布、干燥,得到多层复合的固态、半固态电解电容器隔膜纸。
优选地,所述干燥后还包括卷取和分切。
优选地,采用组合式纸机进行成形。
优选地,成形过程中采用压榨、热压处理。
优选地,所述纸机采用圆网纸机、长网纸机、斜网纸机中的一种或两种。
优选地,在成形过程中还包括将浆料进一步稀释至0.01wt%~2wt%后再进行后续成形。
优选地,在浆料中还添加分散剂、增稠剂、无机填充剂、有机填充剂、消泡剂、表面活性剂中的一种或几种。
优选地,所述耐热层中的植物纤维经过打浆处理,打浆度10~80°SR。
本发明还保护上述多层复合的固态、半固态电解电容器隔膜纸在聚合物铝电解电容器中的应用。
本发明的复合多层的固态、半固态电解电容器隔膜纸采用事发成型技术制备,可以应用于聚合物铝电解电容器中,用于隔离正极箔和负极箔,同时吸收氧化剂和单体或者导电高分子。
与现有技术相比,本发明的有益效果是:
本发明公开的固态、半固态电解电容器隔膜纸包含耐热层和基底层,选用了特定的合成纤维和植物纤维制得耐热层,并且限定了纤维的尺寸,可以有效改善隔膜纸的耐热性,实现对隔膜纸孔径的有效控制,同时也调整了隔膜纸致密性,另外,基底层中的双组分合成纤维可以为隔膜纸提供必要的机械强度,该层纤维之间的孔径较大,孔隙率较高,保证了浸渍液的吸收量,吸液性好,利用其中的低熔点纤维组分提高耐热层和基底层之间的粘结性,高熔点组分保证了材料的强度,因此,本发明制得的固态、半固态电解电容器隔膜纸具有良好的耐热和吸液性,机械强度高,可广泛应用于固态、半固态电解电容器中,如聚合物铝电解电容器,电解电容器具有低ESR性能。
具体实施方式
下面结合具体实施方式对本发明作进一步的说明,但实施例并不对本发明做任何形式的限定。除非另有说明,本发明实施例采用的原料试剂为常规购买的原料试剂。
实施例1
一种多层复合的固态、半固态电解电容器隔膜纸,至少包括两层,第一层为耐热层,第二层为基底层,所述耐热层的紧度为0.5/m3,所述基底层的紧度为0.34g/m3,其余组分如表1所示,其中表中的纤维长度为经过打浆后获得的最终的纤维长度。
上述多层复合的固态、半固态电解电容器隔膜纸的制备方法,包括如下步骤:
将芳纶和阔叶木纤维分别采用盘磨进行打浆,打浆浓度为3%,打浆度分别为30°SR和45°SR;双组分PET纤度1.5Dtex,单组份PET纤维纤度0.5Dtex,纤维长度均为5mm,PET纤维经过分散后,浆浓度为0.5%,通过斜网纸机进行成形,成形浓度0.5%,然后经压榨、干燥、卷取和分切后得到成品。
实施例2
一种多层复合的固态、半固态电解电容器隔膜纸同实施例1,区别在于组分不同,具体如表1所示,其制备方法为:
芳纶和天丝纤维分别用盘磨进行打浆,打浆浓度为3%,打浆度分别为40°SR和53°SR;双组分PET纤度2Dtex,单组份PET纤维纤度0.5Dtex,纤维长度均为5mm,PET纤维经过分散后,浆浓度为0.5%,通过斜网纸机进行成形,成形浓度0.5%,然后经压榨、干燥、卷取和分切后得到成品。
实施例3
一种多层复合的固态、半固态电解电容器隔膜纸同实施例1,区别在于组分不同,具体如表1所示,其制备方法为:
芳纶和麻纤维分别用盘磨进行打浆,打浆浓度为3%,打浆度分别为45°SR和53°SR;PVA纤维纤度为1.5Dtex,玻璃纤维纤度0.5Dtex,单组份PET纤维纤度0.5Dtex,纤维长度均为5mm,纤维经过分散后,浆浓度为0.5%,通过斜网纸机进行成形,成形浓度0.5%,然后经压榨、干燥、卷取和分切后得到成品。
实施例4
一种多层复合的固态、半固态电解电容器隔膜纸同实施例1,区别在于组分不同,具体如表1所示,其制备方法为:
芳纶和麻纤维分别用盘磨进行打浆,打浆浓度为3%,打浆度分别为43°SR和50°SR;PVA纤维纤度为1.5Dtex,玻璃纤维纤度0.5Dtex,单组份PET纤维纤度0.5Dtex,纤维长度均为5mm,纤维经过分散后,浆浓度为0.5%,通过斜网纸机进行成形,成形浓度0.5%,然后经压榨、干燥、卷取和分切后得到成品。
实施例5
一种多层复合的固态、半固态电解电容器隔膜纸同实施例1,区别在于组分不同,具体如表1所示,其制备方法为:
天丝纤维采用盘磨进行打浆,打浆浓度3%,打浆度为60°SR;碳纤维纤度0.5Dtex,双组分PET纤度2Dtex,单组份PET纤维纤度0.5Dtex,纤维长度均为5mm,PET纤维经过分散后,浆浓度为0.5%,通过斜网纸机进行成形,成形浓度0.5%,然后经压榨、干燥、卷取和分切后得到成品。
对比例1
本对比例的固态、半固态电解电容器隔膜纸同实施例1,区别在于组分不同,具体如表1所示,其制备方法为:
芳纶纤维用盘磨进行打浆,打浆浓度为3%,打浆度为50°SR;双组分PET纤度2Dtex,单组份PET纤维纤度0.5Dtex,纤维长度均为5mm,PET纤维经过分散后,浆浓度为0.5%,通过斜网纸机进行成形,成形浓度0.5%,然后经压榨、干燥、卷取和分切后得到成品。
对比例2
本对比例的固态、半固态电解电容器隔膜纸同实施例1,区别在于组分不同,基底层没有双组分合成纤维,具体如表1所示。其制备方法为:
芳纶和阔叶木浆分别采用盘磨进行打浆,大浆浓度为3%,打浆度分别为30°SR和45°SR。单组份PET纤维纤度0.5Dtex,纤维长度均为5mm,PET纤维经过分散后,浆浓度为0.5%,通过斜网纸机进行成形,成形浓度0.5%,然后经压榨、干燥、卷取和分切后得到成品。
对比例3
本对比例的固态、半固态电解电容器隔膜纸同实施例1,区别在于不含有耐热层,其制备方法为:双组分PET纤度2Dtex,单组份PET纤维纤度0.5Dtex,纤维长度均为5mm,PET纤维经过分散后,浆浓度为0.5%,通过斜网纸机进行成形,成形浓度0.5%,然后经压榨、干燥、卷取和分切后得到成品。
对比例4
本对比例的固态、半固态电解电容器隔膜纸同实施例3,区别在于不含有基底层,具体如表1所示,其制备方法为:
芳纶和麻纤维分别用盘磨进行打浆,打浆浓度为3%,打浆度分别为45°SR和53°SR;纤维经过分散后,浆浓度为0.5%,通过斜网纸机进行成形,成形浓度0.5%,然后经压榨、干燥、卷取和分切后得到成品。
表1各实施例和对比例中的组分
性能测试
1、测试方法
(1)厚度μm
隔膜纸厚度测定采用L&W公司的No.251厚度测试仪进行测试,测试样品面积为200mm2。
(2)透气度mm/s
透气度采用FX3300 LabAir IV,测试压强200Pa,测试面积20cm2。
(3)平均孔径μm
孔径测试采用美国PMI公司生产Capillary Flow Porometer-1100A进行测定,使用浸润液Silwick,表面张力20.1Dynes/cm。
(4)10min吸液高度(纵向)mm和10min吸液高度(横向)mm
将隔膜纸裁成15mm宽的纸条,在每张纸条一头距离5mm处用铅笔画以直线,将纸条垂直悬挂于铁架台,画线一头浸没在纯水中,液面与直线保持平齐,浸泡10min,测量液体爬升高度(mm),吸液高度越高,表明吸液性越好。
(5)抗张强度(15mm纵向)N/m和抗张强度(15mm横向)N/m
抗张强度采用万能材料试验机进行测定,参照B453-89标准。
(6)ESR的测定,使用LCR计,在温度为25℃,频率为100kHz的条件下,对通过上述方法制造的固体电解电容器的ESR(等效串联电阻)进行了测定2、测试结果
表2各实施例和对比例的性能测试结果
经测试,本发明实施例1~5制得的固态、半固态电解电容器隔膜纸的定量为10~40g/m2,厚度为30~70μm,厚度越薄,在一定程度上可以降低电容器的ESR值;平均孔径小于10μm,说明可以有效防止隔膜被铝箔表面的毛刺穿透,从而避免电容器短路;透气度>300L/m2.s,明显高于对比例1,说明本发明的隔膜纸具有良好的透气性;纵向抗张强度为300N·m以上,机械强度高;耐热层定量为0~40g/m2(0表示没有该层),基底层定量为0~40g/m2(0表示没有该层),横向吸液高度大于20mm,明显大于对比例1,说明本发明的隔膜纸吸液性好。
采用热重和差式扫描热量分析来研究隔膜纸的耐热性,在氮气气氛中,升温速率20℃/min,最高温度600℃,对比例1制得的隔膜纸在240℃左右开始分解;而实施例1~5制得的隔膜纸开始热分解的温度均高于280℃,说明本发明制得的隔膜纸具有良好的耐热性。
采用实施例中的隔膜卷绕成电容器芯子,并浸渍聚二氧噻吩的分散液,150℃下干燥1.5h,再进行封装,测试电容器的ESR,结果如下表3所示,结果表明本发明实施例1~5隔膜纸制得的电容器的ESR相对较低。
表3实施例1~5和对比例1~4的ESR测试结果
显然,本发明的上述实施例仅仅是为清楚地说明本发明所作的举例,而并非是对本发明的实施方式的限定。对于所属领域的普通技术人员来说,在上述说明的基础上还可以做出其它不同形式的变化或变动。这里无需也无法对所有的实施方式予以穷举。凡在本发明的精神和原则之内所作的任何修改、等同替换和改进等,均应包含在本发明权利要求的保护范围之内。
Claims (10)
1.一种多层复合的固态、半固态电解电容器隔膜纸,其特征在于,至少包括两层,第一层为耐热层,第二层为基底层,所述耐热层的紧度为0.2~0.7g/m3,所述基底层的紧度为0.2~0.7g/m3;所述耐热层包括10wt%~100wt%的合成纤维和0wt%~90wt%的植物纤维;所述基底层包括0wt%~20wt%的植物纤维和20wt%~100wt%的合成纤维,所述耐热层和基底层的植物纤维长度0.1~10mm,合成纤维长度0.1~10mm,其中基底层的合成纤维中含有20wt%~50wt%双组分合成纤维;所述双组分合成纤维包括低熔点纤维组分和高熔点纤维组分。
2.根据权利要求1所述固态、半固态电解电容器隔膜纸,其特征在于,所述耐热层中的合成纤维为碳纤维、玻璃短纤、玻璃棉、氧化铝纤维、陶瓷纤维、芳纶纤维、PBO纤维、丙烯酸纤维、聚酯纤维、尼龙纤维、维尼纶纤维、全芳族聚酰胺、半芳族聚酰胺纤维、聚酰胺酰亚胺纤维、聚醚醚酮纤维、聚苯硫醚纤维、聚氯乙烯纤维、聚偏二氯乙烯纤维、聚醚纤维、聚乙烯基醚纤维、聚乙烯基酮纤维、聚醚醚酮纤维、二烯纤维、聚氨酯纤维、聚苯硫醚纤维中的一种或几种。
3.根据权利要求1或2所述固态、半固态电解电容器隔膜纸,其特征在于,所述耐热层中的植物纤维为阔叶木纤维、针叶木纤维、丝光纤维、棉纤维、麻纤维、竹纤维、草纤维、溶剂纺丝的植物纤维、棉短绒中的一种或几种。
4.根据权利要求1所述固态、半固态电解电容器隔膜纸,其特征在于,所述基底层中的植物纤维为PET纤维、PE纤维、玻纤、PPS纤维、PPTA纤维、PVA纤维、PVOH纤维、尼龙纤维、黏胶纤维、天丝纤维、铜氨纤维中的一种或几种中的一种或几种。
5.根据权利要求1所述固态、半固态电解电容器隔膜纸,其特征在于,所述耐热层和基底层的植物纤维长度0.2~5mm,合成纤维长度1~10mm,纤度为0.1~5dtex。
6.根据权利要求5所述固态、半固态电解电容器隔膜纸,其特征在于,所述基底层中的合成纤维为PET纤维、PE纤维、玻纤、PPS纤维、PPTA纤维、PVA纤维、PVOH纤维、尼龙纤维、黏胶纤维、天丝纤维、铜氨纤维中的一种或几种。
7.根据权利要求1所述固态、半固态电解电容器隔膜纸,其特征在于,所述低熔点纤维组分的熔点为60~1300℃,高熔点纤维组分的熔点为160~2600℃。
8.根据权利要求1所述固态、半固态电解电容器隔膜纸,其特征在于,所述双组分合成纤维为聚苯二甲酸乙二酯复合纤维、聚丙烯/聚乙烯复合纤维、聚对苯二甲酸乙二酯/聚丙烯复合纤维、聚对苯二甲酸乙二酯/聚乙烯复合纤维中的一种或几种。
9.一种多层复合的固态、半固态电解电容器隔膜纸的制备方法,其特征在于,包括如下步骤:
将耐热层的纤维原料加水疏解分散制成第一浆料,将基底层的纤维原料分散均匀,得到第二浆料,将两种浆料分别上网脱水成形,再经过压榨、干燥、喷雾涂布或浸渍涂布、干燥,得到多层复合的固态、半固态电解电容器隔膜纸。
10.一种多层复合的固态、半固态电解电容器隔膜纸在聚合物铝电解电容器中的应用。
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