CN110039793B - 一种锂电池软包装膜的湿法制作工艺 - Google Patents

一种锂电池软包装膜的湿法制作工艺 Download PDF

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CN110039793B
CN110039793B CN201910329745.5A CN201910329745A CN110039793B CN 110039793 B CN110039793 B CN 110039793B CN 201910329745 A CN201910329745 A CN 201910329745A CN 110039793 B CN110039793 B CN 110039793B
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沈均平
高贤
陈涛
贺爱忠
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Shanghai Zijiang new material application technology Co.,Ltd.
SHANGHAI ZIJIANG NEW MATERIAL TECHNOLOGY Co.,Ltd.
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Abstract

本发明公开了一种锂电池软包装膜的湿法制作工艺包括以下工序：(1)对铝箔的毛面和光面进行脱脂和耐腐蚀性处理；(2)将尼龙层的电晕面与处理后的铝箔的毛面作干式复合并固化成型；(3)将铝箔的光面进行粘结剂预涂处理，然后利用挤出复合的方式将聚丙烯薄膜层与铝箔热粘接并冷却成型；(4)对锂电池软包装膜二次加热处理成型后冷却收卷。本发明的锂电池软包装膜的湿法制作工艺，能提升铝塑复合膜生产速率和耐电解液性能。

Description

一种锂电池软包装膜的湿法制作工艺
技术领域
本发明涉及锂电池软包装膜生产领域，具体涉及一种锂电池软包装膜的湿法制作工艺。
背景技术
锂电池包装铝塑复合膜主要由三层材料组成，外层的尼龙(ONPA)，中间层的铝箔(AL)和内层的聚丙烯薄膜(CPP)组成，目前的工艺主要有两种，一种干法复合，是利用聚氨酯、丙烯酸、环氧树脂、马来酸酐聚丙烯等胶黏剂利用干式复合的方式将三层材料直接压合而成。另一种是热法复合，是利用外层的尼龙(BOPA)和中间层的铝箔(AL)用胶黏剂干式复合，中间层铝箔(AL)和内层聚丙烯(CPP)熔融挤出酸改性聚烯烃进行热熔树脂的粘性压合。
当目前热法工艺存在铝箔和聚丙烯层挤出复合生产速度低，耐电解液腐蚀性不强，造成生产效率低，耐电解液性能较差。
发明内容
本发明的目的，就是为了解决上述问题而提供了一种锂电池软包装膜的湿法制作工艺，能提升铝塑复合膜生产速率和耐电解液性能。
本发明的目的是这样实现的：
本发明的一种锂电池软包装膜的湿法制作工艺，锂电池软包装膜包括作为外层的尼龙层，作为中间层的铝箔和作为内层的聚丙烯薄膜层，包括以下工序：
(1)对铝箔的光面和毛面均进行脱脂和耐腐蚀性处理；
(2)将尼龙层的电晕面与经工序(1)处理后的铝箔的毛面作干式复合并固化成型；
(3)将铝箔的光面进行粘结剂预涂处理，然后利用挤出复合的方式将聚丙烯薄膜层与铝箔热粘接并冷却成型；
(4)对锂电池软包装膜二次加热处理成型后冷却收卷。
上述的锂电池软包装膜的湿法制作工艺中工序(1)中铝箔的毛面和光面均作脱脂处理后在铝箔毛面和光面形成含有磷酸盐、三价铬化合物和胺化的酚聚合物的耐腐蚀性皮膜，优选的，耐腐蚀性皮膜的涂布量为0.675～2.5g/m2,干燥温度为120～180℃。
上述的锂电池软包装膜的湿法制作工艺中工序(3)中铝箔光面进行粘结剂预涂处理方式为浸涂、喷涂、凹版涂布、静电吸附或三辊逆转涂布，优选的，粘结剂预涂处理中粘结剂的涂布量为1～5g/m2，干燥温度为130～180℃，更优选的，粘结剂预涂处理的涂布量为2～4g/m2。
上述的锂电池软包装膜的湿法制作工艺中聚丙烯层与铝箔间以酸改性聚丙烯做粘结树脂。
上述的锂电池软包装膜的湿法制作工艺中聚丙烯薄膜层和铝箔进行夹层层压或用热层压法热粘接。
上述的锂电池软包装膜的湿法制作工艺中工序(4)中二次加热处理的加热温度为140～180℃，收卷速度为25～50m/min。
上述的锂电池软包装膜的湿法制作工艺中聚丙烯薄膜层以重量比1∶1的嵌段共聚聚丙烯与聚丙烯弹性体为中间层，以重量比7:3的无规聚丙烯与聚丙烯弹性体为外层,以马来酸酐聚丙烯为内层，内层、中间层和外层的厚度比为1：4：1。
本发明的锂电池软包装膜的湿法制作工艺，能提升铝塑复合膜生产速率和耐电解液性能。
附图说明
图1是本发明一种锂电池软包装膜的湿法制作工艺中执行工序(3)-(4)所采用的设备的结构示意图。
具体实施方式
下面将结合附图，对本发明作进一步说明。
实施例1～2使用的原料如下：
铝箔：日本东洋铝业的45微米厚的合金型号为8079的O态软质铝箔；
铝箔碱洗液：氢氧化钠和碳酸钠或磷酸三钠配制成0.9mol/L的水溶液；
铝箔涂布表面处理液：帕卡表面处理科技有限公司AL用3价铬处理剂SG-L701，浓度为1.3g/m2；
尼龙层：厦门长塑实业有限公司的25微米厚的双向拉伸聚酰胺薄膜(BOPA)，厚度25微米；
粘合剂：选用北京高盟化工有限公司的YH3166/YH3166B双组分聚氨酯粘合剂，重量配比为10∶1.75，工作浓度为25wt％，涂布量为4g/m2；
铝箔表面粘结剂：选用日本尤尼吉可株式会社的YA-6015AJ单组份粘结剂，其中主体树脂熔点145℃，固含量23wt％，涂布量为2g/m2,干燥温度130℃；
嵌段共聚聚丙烯：沙特基础工业公司PP673K；
聚丙烯弹性体1：埃克森美孚3000；
聚丙烯弹性体2：埃克森美孚6102FL；
无规聚丙烯：利安德巴赛尔RP320M；
粘结树脂：马来酸酐聚丙烯；
实施例1～2中使用的设备如图1所示。
实施例1
1、铝箔脱脂处理
将铝箔在铝箔碱洗液中清洗1分钟，并用去离子水清洗烘干。
2、铝箔耐腐蚀性处理
采用微凹涂布工艺进行铝箔的双面辊涂，涂布量为0.675g/m2然后在120℃下进行干燥。
3、尼龙层和铝箔复合：
将尼龙层和粘合剂复合后收卷放置于放卷辊1上。
4、铝箔表面粘结剂预涂处理：
放卷辊1放卷后经过胶槽2，在铝箔表面涂布的粘结剂的涂布量为2g/m2,然后在干燥箱3中进行干燥处理，干燥温度为180℃。
5、铝箔与聚丙烯薄膜层挤出复合：
聚丙烯薄膜层以嵌段共聚聚丙烯与聚丙烯弹性体重量比1∶1为中间层，以无规聚丙烯与聚丙烯弹性体重量比7:3为外层,以马来酸酐聚丙烯为内层，内层、中间层和外层的厚度比为1：4：1。
将聚丙烯薄膜层通过T模头9挤出后与复合的尼龙层和铝箔利用双辊4作热层压法处理后并冷却成层压复合膜，或将成型的聚丙烯薄膜层从放卷辊5放出后与复合的尼龙层和铝箔利用双辊4作夹层层压处理后冷却成层压复合膜。
6、二次加热处理
将层压复合膜在加热辊6上进行二次加热处理，加热温度为140℃，然后在冷却辊7上冷却定型，收卷辊8的速度为25m/min。
实施例2
1、铝箔脱脂处理
将铝箔在铝箔碱洗液中清洗1分钟，并用去离子水清洗烘干。
2、铝箔耐腐蚀性处理
采用微凹涂布工艺进行铝箔的双面辊涂，涂布量为2.5g/m2然后在180℃下进行干燥。
3、尼龙和铝箔复合：
将尼龙层和粘合剂复合后收卷放置于放卷辊1上。
4、铝箔表面粘结剂预涂处理：
放卷辊1放卷后经过胶槽2，在铝箔表面涂布的粘结剂的涂布量为2g/m2,然后在干燥箱3中进行干燥处理，干燥温度为180℃。
5、铝箔与聚丙烯薄膜层挤出复合：
聚丙烯薄膜层以嵌段共聚聚丙烯与聚丙烯弹性体重量比1∶1为中间层，以无规聚丙烯与聚丙烯弹性体重量比7:3为外层,以马来酸酐聚丙烯为内层，内层、中间层和外层的厚度比为1：4：1。
将聚丙烯薄膜层通过T模头9挤出后与复合的尼龙层和铝箔利用双辊4作热层压法处理后并冷却成层压复合膜，或将成型的聚丙烯薄膜层从放卷辊5放出后与复合的尼龙层和铝箔利用双辊4作夹层层压处理后冷却成层压复合膜。
6、二次加热处理
将层压复合膜在加热辊6上进行二次加热处理，加热温度为180℃，然后在冷却辊7上冷却定型，收卷辊8速度50m/min。
产品性能测试
对制得的成品膜进行耐电解液腐蚀性测试，配置1mol/L LiPF6电解液(溶质为1mol/L LiPF6，溶剂碳酸二甲酯：碳酸乙烯酯：碳酸二乙酯＝1:1:1)，取表面平整、洁净、无皱折，宽15mm，长100mm的膜供测试。将样品膜完全浸入电解液瓶中并放置于85℃恒温水浴中，恒温测试至规定时间。取出并用自来水洗净，测试AL/CPP层间剥离强度，测试数据如表1所示。
表1实施例1～2的性能测试结果
Figure BDA0002037322320000041
Figure BDA0002037322320000051
测试结果表明，采用湿法工艺锂电池软包装膜耐电解液性能优异。
以上实施例仅供说明本发明之用，而非对本发明的限制，有关技术领域的技术人员，在不脱离本发明的精神和范围的情况下，还可以作出各种变换或变型，因此所有等同的技术方案也应该属于本发明的范畴，应由各权利要求所限定。

Claims (2)

1.一种锂电池软包装膜的湿法制作工艺，所述锂电池软包装膜包括作为外层的尼龙层，作为中间层的铝箔和作为内层的聚丙烯薄膜层，其特征在于，包括以下工序：
（1）对铝箔的光面和毛面均进行脱脂和耐腐蚀性处理，对铝箔的光面和毛面进行脱脂处理后在铝箔的光面和毛面均形成含有磷酸盐、三价铬化合物和胺化的酚聚合物的耐腐蚀性皮膜，所述耐腐蚀性皮膜的涂布量为0.675～2.5 g/m2,干燥温度120～180℃；
（2）将尼龙层的电晕面与经工序（1）处理后的铝箔的毛面作干式复合并固化成型；
（3）将铝箔的光面进行粘结剂预涂处理，然后利用挤出复合的方式将聚丙烯薄膜层与铝箔热粘接并冷却成型, 铝箔光面进行粘结剂预涂处理方式为浸涂、喷涂、凹版涂布、静电吸附或三辊逆转涂布, 所述粘结剂预涂处理中粘结剂的涂布量为1～5g/m2，干燥温度为130～180℃；
（4）对经工序（3）处理得到的锂电池软包装膜进行二次加热处理，并在成型后冷却收卷，其中，二次加热处理的加热温度为140～180℃，收卷速度为25～50m/min；
所述聚丙烯层与铝箔间以酸改性聚丙烯做粘结树脂；
所述聚丙烯薄膜层和铝箔进行夹层层压或用热层压法热粘接；
所述聚丙烯薄膜层以重量比1∶1的嵌段共聚聚丙烯与聚丙烯弹性体为中间层，以重量比7:3的无规聚丙烯与聚丙烯弹性体为外层,以马来酸酐聚丙烯为内层，内层、中间层和外层的厚度比为1：4：1。
2.如权利要求1所述的锂电池软包装膜的湿法制作工艺，其特征在于，所述粘结剂预涂处理中粘结剂的涂布量为2～4g/m2。
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