CN110395032A - 一种锂离子电池软包装用最内层聚丙烯膜 - Google Patents
一种锂离子电池软包装用最内层聚丙烯膜 Download PDFInfo
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- 239000004743 Polypropylene Substances 0.000 title claims abstract description 41
- 229920001155 polypropylene Polymers 0.000 title claims abstract description 40
- -1 polypropylene Polymers 0.000 title claims abstract description 31
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 12
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 12
- 239000005038 ethylene vinyl acetate Substances 0.000 claims abstract description 24
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 claims abstract description 24
- 229920001903 high density polyethylene Polymers 0.000 claims abstract description 12
- 239000004700 high-density polyethylene Substances 0.000 claims abstract description 12
- 239000004744 fabric Substances 0.000 claims abstract description 10
- 239000000314 lubricant Substances 0.000 claims abstract description 8
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- 238000001816 cooling Methods 0.000 claims abstract description 7
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- 238000004804 winding Methods 0.000 claims abstract description 4
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- HDERJYVLTPVNRI-UHFFFAOYSA-N ethene;ethenyl acetate Chemical compound C=C.CC(=O)OC=C HDERJYVLTPVNRI-UHFFFAOYSA-N 0.000 claims abstract 2
- ZFOZVQLOBQUTQQ-UHFFFAOYSA-N Tributyl citrate Chemical compound CCCCOC(=O)CC(O)(C(=O)OCCCC)CC(=O)OCCCC ZFOZVQLOBQUTQQ-UHFFFAOYSA-N 0.000 claims description 6
- 235000021355 Stearic acid Nutrition 0.000 claims description 4
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical group CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims description 4
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- QZCLKYGREBVARF-UHFFFAOYSA-N Acetyl tributyl citrate Chemical compound CCCCOC(=O)CC(C(=O)OCCCC)(OC(C)=O)CC(=O)OCCCC QZCLKYGREBVARF-UHFFFAOYSA-N 0.000 claims description 3
- CJZGTCYPCWQAJB-UHFFFAOYSA-L calcium stearate Chemical compound [Ca+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CJZGTCYPCWQAJB-UHFFFAOYSA-L 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 2
- AYOHIQLKSOJJQH-UHFFFAOYSA-N dibutyltin Chemical compound CCCC[Sn]CCCC AYOHIQLKSOJJQH-UHFFFAOYSA-N 0.000 claims 2
- XNGIFLGASWRNHJ-UHFFFAOYSA-N phthalic acid Chemical compound OC(=O)C1=CC=CC=C1C(O)=O XNGIFLGASWRNHJ-UHFFFAOYSA-N 0.000 claims 2
- 150000002148 esters Chemical class 0.000 claims 1
- 238000007789 sealing Methods 0.000 abstract description 13
- 150000001875 compounds Chemical class 0.000 abstract description 3
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- UKLDJPRMSDWDSL-UHFFFAOYSA-L [dibutyl(dodecanoyloxy)stannyl] dodecanoate Chemical group CCCCCCCCCCCC(=O)O[Sn](CCCC)(CCCC)OC(=O)CCCCCCCCCCC UKLDJPRMSDWDSL-UHFFFAOYSA-L 0.000 description 3
- 239000012975 dibutyltin dilaurate Substances 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 3
- 229920001778 nylon Polymers 0.000 description 3
- MQIUGAXCHLFZKX-UHFFFAOYSA-N Di-n-octyl phthalate Natural products CCCCCCCCOC(=O)C1=CC=CC=C1C(=O)OCCCCCCCC MQIUGAXCHLFZKX-UHFFFAOYSA-N 0.000 description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- BJQHLKABXJIVAM-UHFFFAOYSA-N bis(2-ethylhexyl) phthalate Chemical group CCCCC(CC)COC(=O)C1=CC=CC=C1C(=O)OCC(CC)CCCC BJQHLKABXJIVAM-UHFFFAOYSA-N 0.000 description 2
- 239000008116 calcium stearate Substances 0.000 description 2
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- LSDPWZHWYPCBBB-UHFFFAOYSA-N Methanethiol Chemical compound SC LSDPWZHWYPCBBB-UHFFFAOYSA-N 0.000 description 1
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- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 1
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- 239000002131 composite material Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
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- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000008029 phthalate plasticizer Substances 0.000 description 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
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Abstract
本发明涉及锂离子电池软包装复合膜技术领域,且公开了一种锂离子电池软包装用最内层聚丙烯膜,包括以下重量份数配比的原料:65~80份的高密度聚乙烯、15~25份的乙烯‑醋酸乙烯共聚物(EVA)、10~20份的增塑剂、1~2.5份的稳定剂、1~3份的润滑剂;将低熔点的乙烯‑醋酸乙烯共聚物(EVA)与聚丙烯(PP)一起经预塑化,再经过滤网至挤出平模,挤出料双面粘附网格布,到四辊压延机组,再经冷却辊组、测厚仪、牵引装置、成型卷绕等一系列步骤,制备得到成卷的乙烯‑醋酸乙烯‑聚丙烯共混单层膜,即最内层聚丙烯膜。本发明解决了目前电池软包装用最内层聚丙烯膜,存在的热封性能不是很好,尤其是低温热封性能较差的技术问题的技术问题。
Description
技术领域
本发明涉及锂离子电池软包装复合膜技术领域,具体为一种锂离子电池软包装用最内层聚丙烯膜。
背景技术
锂离子电池软包装复合膜类似于食品软包装复合膜结构,按照其各层分类基层分别为最外层,中间层或者阻隔层和最内层,各基层之间通过粘合剂形成的粘合层相互粘合成一片膜。
最内层要长期具有良好的热封性能和耐溶剂性能,而一般市面上用的锂离子电池内层材料都是具有单层或多层结构的聚丙烯,由于目前电解液的主要组成是碳酸酯类,所以不可避免的造成内层材料同电解液发生渗透等一系列物理化学变化,流延聚丙烯薄膜较其他材料能较好地满足锂离子电池的电学性能,但是考虑到聚丙烯材料的热封性能不是很好,尤其是低温热封性能较差,而电池内部电解液在高温下易发生分解化学变化,所以对聚丙烯的改性也成为制造电池用软包装材料的难点之一。
发明内容
(一)解决的技术问题
针对现有技术的不足,本发明提供了一种锂离子电池软包装用最内层聚丙烯膜,解决了目前电池软包装用最内层聚丙烯膜,存在的热封性能不是很好,尤其是低温热封性能较差的技术问题。
(二)技术方案
为实现上述目的,本发明提供如下技术方案:
一种锂离子电池软包装用最内层聚丙烯膜,包括以下重量份数配比的原料:65~80份的高密度聚乙烯、15~25份的乙烯-醋酸乙烯共聚物(EVA)、10~20份的增塑剂、1~2.5份的稳定剂、1~3份的润滑剂;
将低熔点的乙烯-醋酸乙烯共聚物(EVA)与聚丙烯(PP)一起经预塑化,再经过滤网至挤出平模,挤出料双面粘附网格布,到四辊压延机组,再经冷却辊组、测厚仪、牵引装置、成型卷绕等一系列步骤,制备得到成卷的乙烯-醋酸乙烯-聚丙烯共混单层膜,即最内层聚丙烯膜。
优选的,所述增塑剂为邻苯二甲酸二辛酯、柠檬酸三丁酯或者乙酰柠檬酸。
优选的,所述稳定剂为二月桂酸二丁基锡或硫醇锡。
优选的,所述润滑剂为硬脂酸或硬脂酸钙。
(三)有益的技术效果
与现有技术相比,本发明具备以下有益的技术效果:
本发明通过将低熔点的乙烯-醋酸乙烯共聚物(EVA)与聚丙烯(PP)一起经预塑化,再经过滤网至挤出平模,挤出料双面粘附网格布,到四辊压延机组,再经冷却辊组、测厚仪、牵引装置、成型卷绕等一系列步骤,制备得到成卷的乙烯-醋酸乙烯-聚丙烯共混单层膜,即最内层聚丙烯膜,且该最内层聚丙烯膜的热封温度为105℃、热封压力为0.15MPa、热封时间为0.5s,且其热封强度≥40N/15mm;
由于本发明制备的最内层聚丙烯膜中,加入了低熔点的乙烯-醋酸乙烯共聚物(EVA),有效地提高了其热封性能,尤其是低温热封性能,从而解决了目前电池软包装用最内层聚丙烯膜,存在的热封性能不是很好,尤其是低温热封性能较差的技术问题。
具体实施方式
聚丙烯(PP),熔融指数0.5g/10min,熔点164~170℃,瑞思试剂有限公司;
乙烯-醋酸乙烯共聚物(EVA),醋酸乙烯12wt.%,熔融指数8g/10min,熔点75℃,麦克林试剂有限公司。
实施例一:
(1)将65g高密度聚乙烯、15g乙烯-醋酸乙烯共聚物(EVA)、10g邻苯二甲酸二辛酯增塑剂、1g二月桂酸二丁基锡稳定剂、1~3g硬脂酸润滑剂一起加入到高速混合机中进行混料处理,出料后得到混合粉;
(2)将步骤(1)中得到的混合粉送至双螺杆挤出机进行预塑化,再经过滤网至挤出平模,挤出料双面粘附网格布,到四辊压延机组,再经冷却辊组、测厚仪、牵引装置、成型卷绕,即得成卷的最内层聚丙烯膜;
其中,双螺杆挤出机的料筒温度依次为:加料段170℃、塑化段165℃、计量段165℃;四辊温度分别从下往上分别为:100℃、120℃、80℃、60℃;网格布材质为PET或尼龙,且要先进行预热,其预热温度为:160℃;
(3)对步骤(2)中制备的最内层聚丙烯膜进行性能测试,其热封温度为150℃、热封压力为0.15MPa、热封时间为0.5s,且其热封强度≥40N/15mm。
实施例二:
(1)将80g高密度聚乙烯、25g乙烯-醋酸乙烯共聚物(EVA)、20g柠檬酸三丁酯增塑剂、1~2.5g硫醇锡稳定剂、1~3g硬脂酸钙润滑剂一起加入到高速混合机中进行混料处理,出料后得到混合粉;
(2)将步骤(1)中得到的混合粉送至双螺杆挤出机进行预塑化,再经过滤网至挤出平模,挤出料双面粘附网格布,到四辊压延机组,再经冷却辊组、测厚仪、牵引装置、成型卷绕,即得成卷的最内层聚丙烯膜;
其中,双螺杆挤出机的料筒温度依次为:加料段180℃、塑化段170℃、计量段175℃;四辊温度分别从下往上分别为:120℃、140℃、100℃、80℃;网格布材质为PET或尼龙,且要先进行预热,其预热温度为:180℃;
(3)对步骤(2)中制备的最内层聚丙烯膜进行性能测试,其热封温度为150℃、热封压力为0.15MPa、热封时间为0.5s,且其热封强度≥40N/15mm。
实施例三:
(1)将70g高密度聚乙烯、20g乙烯-醋酸乙烯共聚物(EVA)、10g乙酰柠檬酸增塑剂、2g二月桂酸二丁基锡稳定剂、2g硬脂酸润滑剂一起加入到高速混合机中进行混料处理,出料后得到混合粉;
(2)将步骤(1)中得到的混合粉送至双螺杆挤出机进行预塑化,再经过滤网至挤出平模,挤出料双面粘附网格布,到四辊压延机组,再经冷却辊组、测厚仪、牵引装置、成型卷绕,即得成卷的最内层聚丙烯膜;
其中,双螺杆挤出机的料筒温度依次为:加料段175℃、塑化段170℃、计量段170℃;四辊温度分别从下往上分别为:110℃、130℃、90℃、70℃;网格布材质为PET或尼龙,且要先进行预热,其预热温度为:170℃;
(3)对步骤(2)中制备的最内层聚丙烯膜进行性能测试,其热封温度为150℃、热封压力为0.15MPa、热封时间为0.5s,且其热封强度≥40N/15mm。
Claims (4)
1.一种锂离子电池软包装用最内层聚丙烯膜,其特征在于,包括以下重量份数配比的原料:65~80份的高密度聚乙烯、15~25份的乙烯-醋酸乙烯共聚物(EVA)、10~20份的增塑剂、1~2.5份的稳定剂、1~3份的润滑剂;
将低熔点的乙烯-醋酸乙烯共聚物(EVA)与聚丙烯(PP)一起经预塑化,再经过滤网至挤出平模,挤出料双面粘附网格布,到四辊压延机组,再经冷却辊组、测厚仪、牵引装置、成型卷绕等一系列步骤,制备得到成卷的乙烯-醋酸乙烯-聚丙烯共混单层膜,即最内层聚丙烯膜。
2.根据权利要求1所述的最内层聚丙烯膜,其特征在于,所述增塑剂为邻苯二甲酸二辛酯、柠檬酸三丁酯或者乙酰柠檬酸。
3.根据权利要求1所述的最内层聚丙烯膜,其特征在于,所述稳定剂为二月桂酸二丁基锡或硫醇锡。
4.根据权利要求1所述的最内层聚丙烯膜,其特征在于,所述润滑剂为硬脂酸或硬脂酸钙。
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