CN112280494B - 一种锂电池用pi基材热熔单面胶带及其制备方法 - Google Patents
一种锂电池用pi基材热熔单面胶带及其制备方法 Download PDFInfo
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Abstract
本发明公开了一种锂电池用PI基材热熔单面胶带,从上到下依次为热熔压敏胶层、PI基材层和离型涂层,热熔压敏胶层的厚度为4~20μm,按重量份计,包括如下组分:苯乙烯嵌段共聚物10~20份、氢化苯乙烯嵌段共聚物10~20份、氢化石油树脂30~50份、聚羟基烯烃低聚物5~10份、抗氧剂1~2份和交联剂1.8~3.6份;PI基材层为金黄色双向拉伸PI膜,厚度为5~20μm;离型涂层为无硅离型涂层。本发明的有益效果是:(1)使用耐电解液合成橡胶型胶水,泡电解液后粘接强度高;(2)使用本体具有颜色的金黄色PI基材膜,胶水终不添加颜料,避免胶带长期使用后析出脱色的风险;(3)使用无硅离型剂,附着力增加,解卷力适中,适合自动化使用。
Description
技术领域
本发明涉及胶黏剂技术领域,尤其涉及一种锂电池用PI基材热熔单面胶带及其制备方法。
背景技术
锂离子电池是一种可充电电池,由于其工作电压高、体积小、质量轻、能量高、无记忆效应、自放电小、循环寿命长等优点,广泛应用于手机、笔记本等便携式领域。另由于锂离子电池中不含有重金属铬,与镍铬电池相比,大大减少了对环境的污染。
锂电池电芯内部如极片绝缘保护、卷绕终止保护、底部绝缘固定一般采用单面终止胶带粘接,终止胶带大都采用PET基材,涂布加入色浆的丙烯酸压敏胶,丙烯酸胶水具有常温粘性适中,贴附性好,价格低廉等优势。同时现有的终止胶水存在着泡电解液后粘性减弱,降低锂电池抗跌落性能,颜料加入到胶水体系中,长期浸泡有析出的风险。
发明内容
本发明针对现有锂电池用终止胶带存在的不足,提供一种锂电池用PI基材热熔单面胶带,从上到下依次为热熔压敏胶层、PI基材层和离型涂层,热熔压敏胶层的厚度为4~20μm,按重量份计,包括如下组分:苯乙烯嵌段共聚物10~20份、氢化苯乙烯嵌段共聚物10~20份、氢化石油树脂30~50份、聚羟基烯烃低聚物5~10份、抗氧剂1~2份和交联剂1.8~3.6份;所述PI基材层为金黄色双向拉伸PI膜,厚度为5~20μm;离型涂层为无硅离型涂层。
其中所述苯乙烯嵌段共聚物为苯乙烯-聚异戊二烯-苯乙烯嵌段共聚物(SIS)、苯乙烯-聚丁二烯-苯乙烯嵌段共聚物(SBS)的一种或二者的复配,其中苯乙烯含量为13~30%,作为优选的苯乙烯嵌段共聚物具体例,可选自瑞翁株式会社生产的Quintac(SIS)系列,科腾聚合物公司生产的Karton D(SIS、SBS)系列。
进一步,所述氢化苯乙烯嵌段共聚物为氢化苯乙烯-聚异戊二烯-苯乙烯嵌段共聚物(SEPS)、氢化苯乙烯-聚丁二烯-苯乙烯嵌段共聚物(SEBS)、马来酸酐改性氢化苯乙烯-聚丁二烯-苯乙烯嵌段共聚物(SEBS-MAH)的一种、任意两种的复配、任意三种的复配,作为优选的苯乙烯嵌段共聚物具体例,可选自科腾聚合物公司生产的Karton G聚合物和KartonFG聚合物系列,旭化成株式会社Tuftec(SEBS)系列聚合物。
进一步,所述氢化石油树脂为软化点为80~140℃的氢化石油树脂,作为优选软化点为90~125℃,可选自美国伊士曼EASTOTAC系列,荒川化学工业株式会社生产的ARKON系列,美国伊士曼EASTOTAC系列,中国台湾联超FUCLEAR系列。
进一步,所述聚羟基烯烃低聚物,主链为饱和烃骨架,具有多个羟基,分子量范围1000~3000,作为优选的聚羟基烯烃低聚物,可选自三菱化学株式会社生产的POLYTAIL等。
进一步,所述的交联剂为甲苯二异氰酸酯-三羟甲基丙烷(TDI-TMP),可选用的有拜耳公司Desmodur L75固化剂。
进一步,本发明所优选的有机溶剂,是使上述各组分溶解或分散,且具有合适的挥发性、应使用聚氨酯级溶剂(水含量低于0.05%,无羟基或氨基活性基团),且溶剂内不应含有能与本品反应的基团。具体可列举甲苯、正己烷、二甲苯、环己烷、甲基环己烷、乙基环己烷与甲基乙基酮等。
本发明的有益效果是:(1)使用耐电解液合成橡胶型胶水,泡电解液后粘接强度高;(2)使用本体具有颜色的金黄色PI基材膜,胶水中不添加颜料,避免胶带长期使用后析出脱色的风险;(3)使用无硅离型剂,附着力增加,解卷力适中,适合自动化使用。
上述锂电池锂电池用PI基材热熔单面胶带的制备方法如下:
(1)按重量份数称取热熔压敏胶的原料,用溶剂溶解,配制成固含量为20~30wt%的热熔压敏胶组合物;
(2)将热熔压敏胶组合物加入到转移式涂布机中,同时将单面离型膜放置于转移式涂布机的放卷单元,在单面离型膜的离型面涂布热熔胶水,经过烘道烘干,烘道的温度设置为80~110℃,干燥3~5min;
(3)将做好无硅离型的PI基材膜放入到机尾第二放卷单元,非离型面涂胶面朝上,电晕机单面电晕,将步骤2)烘干的胶水复合到PI基材表面,复合辊温度80~100℃、复合压力0.5~0.6MPa,收卷得半成品;
(4)将半成品放入熟化车间,40~60℃熟化48h后取出,复卷剥离单面离型膜,收卷成PI热熔单面胶带,按用户使用宽度分切即得到成品。
具体实施方式
以下结合实例对本发明进行描述,所举实例只用于解释本发明,并非用于限定本发明的范围。
实施例1
一种锂电池用PI基材热熔单面胶带的制备方法,其步骤为:
1、在装有油浴加热装置、冷凝器和搅拌装置的100L玻璃反应釜中中,加入37.5kg作为溶剂的甲苯/甲基乙基酮=90/10,开启油浴加热循环装置,设定油浴温度为70℃,逐步加入3.125kg苯乙烯嵌段共聚物弹性体,瑞翁株式会社生产的Quintac3421(SIS类,苯乙烯含量14wt%);氢化苯乙烯嵌段共聚物弹性体,3.125kg科腾聚合物生产的Karton G1657(SEBS类,苯乙烯含量13wt%);5kg氢化石油树脂,伊士曼生产的Eastotac C-100W;聚羟基烯烃低聚物,1.25kg三菱化学株式会社生产的POLYTAIL H(分子量2700,羟值45~50mgKOH/g);0.125kg抗氧剂,巴斯夫生产的IRGANOXB215;在内温70℃条件下,搅拌2小时,得到粘合剂组合物;
2、将上述组合物冷却到室温,边搅拌边加入0.6kg作为多官能异氰酸酯的拜耳公司生产的Desmodur L75固化剂,得到热熔压敏胶组合物,固含量为25%;
3、将热熔压敏胶组合物加入到转移式涂布机中,同时将单面离型膜放置于转移式涂布机的放卷单元,在单面离型膜的离型面涂布热熔压敏胶组合物,经过烘道烘干,烘道的温度设置为80~110℃,干燥3~5min,干胶厚度4μm;
4、将做好无硅离型的PI基材膜(厚度12μm)放入到机尾第二放卷单元,非离型涂胶面朝上,电晕机单面电晕,将烘干的胶水复合到PI基材表面,复合辊温度80~100℃、复合压力0.5~0.6MPa,收卷得半成品,厚度为16μm;
5、将半成品放入熟化车间,40~60℃熟化48h后取出,复卷剥离单面离型膜,收卷成PI热熔单面胶带,按用户使用宽度分切即得到成品。
实施例2中PI基材替换为8μm厚度膜,其它均与实施例1相同。
实施例3中涂布干胶厚度改为8μm,其它均与实施例1相同。
实施例4中苯乙烯嵌段共聚物Quintac3421替换为Karton D1101,其它均与实施例1相同。
实施例5中氢化苯乙烯嵌段共聚物弹性体Karton G1657替代为Karton FG 1901X,其它均与实施例1相同。
实施例6中聚羟基烯烃低聚物POLYTAIL H替换为POLYTAIL HA(分子量2000),其它均与实施例1相同。
实施例7中氢化石油树脂Eastotac C-100W替换为荒川化学工业株式会社生产的ARKON P-90,其它均与实施例1相同。
对比例1
一种热熔单面胶带的制备方法,与对比例1的区别仅为不加入聚羟基烯烃低聚物和多官能团异氰酸酯交联剂。
采用下述方法测试实施例1-7以及对比例1所得热熔胶的粘合强度:
1)按照国家标准GB/T 2792-2014所述方法进行PI热熔单面胶带的剥离强度测试;
2)热压后剥离强度测试:PI热熔单面胶带粘接12μm厚度铝箔、用0.5~1.0MPa的面压压力,75~85℃热压60min,冷却到常温后按照国家标准GB/T 2792-2014所述方法进行剥离强度测试;
3)热压后浸泡电解液剥离强度测试:按照2)做好测试样件浸泡于锂电池电解液,电解液质量配比如下:EC/PC/DEC/EP=30/10/30/30,1M LiPF6锂盐质量比按12.5%计算,85℃ 6h以上,冷却到常温后按照国家标准GB/T 2792-2014所述方法进行剥离强度测试;
4)电解液浸泡颜色测试:浸泡电解液80~90℃ 6h以上,(胶带和电解液质量比例为1:20~100)观察电解液颜色变化。
表1.实施例1-7与对比例1所得热熔胶性能对比
实施例1 | 实施例2 | 实施例3 | 实施例4 | 实施例5 | 实施例6 | 实施例7 | 对比例1 | |
PI基材厚度/μm | 12 | 8 | 12 | 12 | 12 | 12 | 12 | 12 |
胶层厚度/μm | 4 | 4 | 8 | 4 | 4 | 4 | 4 | 4 |
胶带总厚/μm | 16 | 12 | 20 | 16 | 16 | 16 | 16 | 16 |
180°剥离强度 (N/mm) | 0.20 | 0.15 | 0.24 | 0.17 | 0.21 | 0.22 | 0.22 | 0.16 |
热压后180°剥离强度(N/mm) | 0.30 | 0.24 | 0.35 | 0.33 | 0.38 | 0.32 | 0.35 | 0.28 |
热压后浸泡电解液180°剥离强度(N/mm) | 0.19 | 0.10 | 0.22 | 0.17 | 0.26 | 0.16 | 0.18 | 0.03 |
浸泡电解液颜色测试 | 无 | 无 | 无 | 无 | 无 | 无 | 无 | 无 |
从表1所示的结果可以看出,本发明提供的PI基材热熔单面胶带对锂电池电芯粘接性能较好,耐电解液腐蚀,且不与电解液起化学反应,具有产业利用的可行性。
以上所述仅为本发明的较佳实施例,并不用以限制本发明,凡在本发明的精神和原则之内,所作的任何修改、等同替换、改进等,均应包含在本发明的保护范围之内。
Claims (5)
1.一种锂电池用PI基材热熔单面胶带,从上到下依次为热熔压敏胶层、PI基材层和离型涂层,其特征在于,
所述热熔压敏胶层的厚度为4~20μm,按重量份计,包括如下组分:苯乙烯嵌段共聚物10~20份、氢化苯乙烯嵌段共聚物10~20份、氢化石油树脂30~50份、聚羟基烯烃低聚物5~10份、抗氧剂1~2份和交联剂1.8~3.6份;
所述热熔压敏胶层的组分中不包括颜料;
所述PI基材层为金黄色双向拉伸PI膜,厚度为5~20μm;
所述离型涂层为无硅离型涂层。
2.根据权利要求1所述的锂电池用PI基材热熔单面胶带,其特征在于,所述苯乙烯嵌段共聚物苯乙烯含量为13~30%,选自苯乙烯-聚异戊二烯-苯乙烯嵌段共聚物、苯乙烯-聚丁二烯-苯乙烯嵌段共聚物中的一种或二者的组合。
3.根据权利要求1所述的锂电池用PI基材热熔单面胶带,其特征在于,所述氢化苯乙烯嵌段共聚物为氢化苯乙烯-聚异戊二烯-苯乙烯嵌段共聚物、氢化苯乙烯-聚丁二烯-苯乙烯嵌段共聚物或马来酸酐改性氢化苯乙烯-聚丁二烯-苯乙烯嵌段共聚物的一种或多种的组合。
4.根据权利要求1所述的锂电池用PI基材热熔单面胶带,其特征在于,所述聚羟基烯烃低聚物主链为饱和烃骨架,具有多个羟基,数均分子量为1000~3000。
5.一种如权利要求1-4任一项所述的锂电池用PI基材热熔单面胶带的制备方法,其特征在于,包括如下步骤:
(1)按重量份数称取热熔压敏胶的原料,用溶剂溶解,配制成固含量为20~30wt%的胶水溶液;
(2)将热熔压敏胶组合物加入到转移式涂布机中,同时将单面离型膜放置于转移式涂布机的放卷单元,在单面离型膜的离型面涂布热熔胶水,经过烘道烘干,烘道的温度设置为80~110℃,干燥3~5min;
(3)将做好无硅离型的PI基材膜放入到机尾第二放卷单元,非离型面涂胶面朝上,电晕机单面电晕,将步骤( 2)烘干的胶水复合到PI基材表面,复合辊温度80~100℃、复合压力0.5~0.6MPa,收卷得半成品;
(4)将半成品放入熟化车间,40~60℃熟化48h后取出,复卷剥离单面离型膜,收卷成PI热熔单面胶带,按用户使用宽度分切即得到成品。
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