CN108084916A - 一种锂电池双面胶带 - Google Patents
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Abstract
本发明涉及一种锂电池双面胶带,包括聚丙烯薄膜制成的基材层,所述基材层的上下两面均涂布有橡胶型压敏胶粘剂层,其中一面的橡胶型压敏胶粘剂层的外侧粘结有离型层,所述橡胶型压敏胶粘剂层以重量份数计,由以下各原料组成:饱和聚烯烃橡胶或氢化聚烯烃嵌段型橡胶30~80份,饱和烃树脂5~80份,抗氧剂0.1~5份。本发明胶带中使用的饱和聚烯烃橡胶、氢化聚烯烃嵌段型橡胶以及饱和烃增粘树脂与电解液均不起反应,因此在电解液中能够保持良好的稳定性,同时对隔膜聚乙烯膜或外包装材料聚丙烯有良好的粘接力;该双面胶带电化学稳定性好,耐电解液,能应用于锂电池电芯和外包装材料的粘接。
Description
技术领域
本发明涉及一种锂电池双面胶带,其适合用于锂电池中,属于胶黏剂技术领域。
背景技术
铅酸电池,镍镉电池,镍氢电池,其应用的核心技术是电池的电解液密封,诸如锂离子电池,绝缘电极入口,所述终端出于绝缘和密封的目的,使用各种胶带来提高将电极包装到电池中的密封性。
这样的胶黏带,传统上是以聚对苯二甲酸乙酯膜,聚酰亚胺膜或聚苯硫醚薄膜(PPS)为基材,涂覆丙烯酸类压敏胶层和基于天然橡胶的压敏粘合剂层等。在这些压敏胶带中,用于锂电池粘接的胶带,大部分是以聚对苯二甲酸乙酯(PET)为基材,涂覆丙烯酸胶水、天然橡胶和不饱和合成橡胶胶水制成。
上述的以聚对苯二甲酸乙酯(PET)为基材生产的压敏胶带的主要问题在于,聚对苯二甲酸乙酯、丙烯酸酯、天然橡胶和不饱和合成橡胶在电解液溶剂的作用下会有降解,降解产生的水分造成锂电池的电性能改变,电压降低。中国发明专利CN104610883公开了以聚对苯二甲酸乙酯为基材,涂覆合成橡胶苯乙烯-异戊二烯-苯乙烯共聚物(S IS)、低分子量聚烯烃橡胶、石油树脂的橡胶型压敏胶,采用引发剂交联,但其主要缺陷在于聚对苯二甲酸乙酯、通过化学交联后的苯乙烯-异戊二烯-苯乙烯共聚物(S IS)在溶剂中会有降解,降解产生的水分对锂电池的电性能产生比较大的影响。
发明内容
本发明针对现有锂电池压敏胶带存在的不足,提供一种锂电池双面胶带。
本发明解决上述技术问题的技术方案如下:
一种锂电池双面胶带,包括聚丙烯薄膜制成的基材层,所述基材层的上下两面均涂布有橡胶型压敏胶粘剂层,其中一面的橡胶型压敏胶粘剂层的外侧粘结有离型层,所述橡胶型压敏胶粘剂层以重量份数计,由以下各原料组成:饱和聚烯烃橡胶或氢化聚烯烃嵌段型橡胶30~80份,饱和烃树脂5~80份,抗氧剂0.1~5份。
本发明的有益效果是:
1)本发明胶带中使用的饱和聚烯烃橡胶、氢化聚烯烃嵌段型橡胶以及饱和烃增粘树脂与电解液均不起反应,因此在电解液中能够保持良好的稳定性,同时对隔膜聚乙烯膜或外包装材料聚丙烯有良好的粘接力;
2)本发明的锂电池双面胶带粘接力强,耐电解液性能好,提高了锂电池的使用寿命。
在上述技术方案的基础上,本发明还可以做如下改进。
进一步,所述离型层为双面无硅离型膜,厚度为20~100μm。涂覆离型图层硬脂酸化合物如聚乙烯基硬脂基氨基甲酸酯或硬脂酸铬络合物或马来酸酐和硬脂基胺的反应产物。
采用上述进一步技术方案的有益效果是,胶带中不含有离型剂,使得胶带具有较好的耐热性,尺寸稳定性好。
进一步,所述基材层为双轴拉伸聚丙烯薄膜(BOPP),厚度为5~50μm。
采用上述进一步技术方案的有益效果是,采用双轴拉伸的聚丙烯膜为基材,其具有较好的耐热性,尺寸稳定性好,同时不含有极性亲和基团,因此不会与电解液反应。
进一步,所述饱和聚烯烃橡胶为聚异丁基橡胶或丁基橡胶中的一种或二者的复配;所述氢化聚烯烃嵌段型橡胶为氢化苯乙烯-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)的一种或二者的复配。
进一步,所述的饱和烃树脂为氢化石油树脂、氢化萜烯树脂、氢化松香树脂中的一种或任意两种的复配,优选氢化石油树脂。
进一步,所述抗氧剂为抗氧剂Irganox 1010、Irganox 168中的一种或二者的复配。
上述锂电池双面胶带的制备方法如下:
(1)在离型膜上涂布橡胶型压敏胶粘剂,经过烘道烘干,烘干温度为70~100℃,时间为3~5min,后将基材表面双面电晕处理,电晕的电场强度为18~40千伏/厘米,使得处理后的基材表面电晕值为48达因以上,然后把离型膜上的橡胶型压敏胶粘剂通过复合转涂在基材上,复合压力为14~18Kg/cm2,得胶带半成品;
(2)在双面离型膜上涂布橡胶型压敏胶粘剂,经过烘道烘干,烘干温度为70~100℃,时间为3~5min,然后与步骤1)所得的胶带半成品复合,后将离型膜剥离收卷,母卷胶带机尾收卷。
附图说明
图1为本发明双面胶带的整体结构示意图;
图1中,1、离型层;2、橡胶型压敏胶粘剂层;3、基材层;4、橡胶型压敏胶粘剂层
具体实施方式
以下结合实例对本发明的原理和特征进行描述,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1-4所使用的原料如表1所示:
表1:实施例1-4和对比例1配比
使用上述原料生产锂电池双面胶带的过程如下:
(1)在离型膜上涂布橡胶型压敏胶粘剂,经过烘道烘干,烘干温度为70~100℃,时间为3~5min,后将基材表面双面电晕处理,电晕的电场强度为18~40千伏/厘米,使得处理后的基材表面电晕值为48达因以上,然后把离型膜上的橡胶型压敏胶粘剂通过复合转涂在基材上,复合压力为14~18Kg/cm2,得胶带半成品;
(2)在双面离型膜上涂布橡胶型压敏胶粘剂,经过烘道烘干,烘干温度为70~100℃,时间为3~5min,然后与步骤1)所得的胶带半成品复合,后将离型膜剥离收卷,母卷胶带机尾收卷。
我们将实施例1-4和对比例1所得胶带进行了各项性能的测试,结果如表2所示:
表2:实施例1-4和对比例1所得胶带的性能测试数据
从表2所示的结果可以看出,本发明提供的锂电池双面胶带对PE和PP粘接性能较好,耐电解液腐蚀,且不与电解液起电化学反应。
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 (7)
1.一种锂电池双面胶带,包括聚丙烯薄膜制成的基材层,所述基材层的上下两面均涂布有橡胶型压敏胶粘剂层,其中一面的橡胶型压敏胶粘剂层的外侧粘结有离型层,所述橡胶型压敏胶粘剂层以重量份数计,由以下各原料组成:饱和聚烯烃橡胶或氢化聚烯烃嵌段型橡胶30~80份,饱和烃树脂5~80份,抗氧剂0.1~5份。
2.根据权利要求1所述的锂电池双面胶带,其特征在于,所述离型层为双面无硅离型膜,厚度为20~100μm。
3.根据权利要求1所述的锂电池双面胶带,其特征在于,所述基材层为双轴拉伸聚丙烯薄膜,厚度为5~50μm。
4.根据权利要求1所述的锂电池双面胶带,其特征在于,所述饱和聚烯烃橡胶为聚异丁基橡胶或丁基橡胶中的一种或二者的复配;所述氢化聚烯烃嵌段型橡胶为氢化苯乙烯-聚异戊二烯-苯乙烯嵌段共聚物、氢化苯乙烯-聚丁二烯-苯乙烯嵌段共聚物的一种或二者的复配。
5.根据权利要求1所述的锂电池双面胶带,其特征在于,所述的饱和烃树脂为氢化石油树脂、氢化萜烯树脂、氢化松香树脂中的一种或任意两种的复配。
6.根据权利要求5所述的锂电池双面胶带,其特征在于,所述的饱和烃树脂为氢化石油树脂。
7.根据权利要求1所述的锂电池双面胶带,其特征在于,所述的抗氧剂为抗氧剂Irganox 1010、Irganox 168中的一种或二者的复配。
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