CN114013146A - 一种高阻隔、抗静电、高爽滑双向拉伸可降解薄膜及其制备方法 - Google Patents

一种高阻隔、抗静电、高爽滑双向拉伸可降解薄膜及其制备方法 Download PDF

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CN114013146A
CN114013146A CN202111321909.3A CN202111321909A CN114013146A CN 114013146 A CN114013146 A CN 114013146A CN 202111321909 A CN202111321909 A CN 202111321909A CN 114013146 A CN114013146 A CN 114013146A
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沈智全
黎坛
王俊峰
赵洁
徐佳
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Hainan Shiner Industrial Co Ltd
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Abstract

本发明提供了一种高阻隔、抗静电、高爽滑双向拉伸可降解薄膜，包括依次复合的爽滑层、芯层、热封层；其中，所述爽滑层和热封层为聚乳酸层；所述芯层为聚乳酸和聚乙交酯的共混物层。本发明制备的上述双向拉伸可降解薄膜，薄膜(22μm厚度)的水汽透过率＜50g/(m2·day)，纵向断裂伸长率(MD)保持在90％以上，横向断裂伸长率(TD)保持在110％以上。热封强度在80℃时在3.5N/15mm2以上，表面粗糙度在0.3以下，体积电阻率在1011Ω·cm，在满足可降解的同时，薄膜的其他性能也大大满足现有包装膜的要求，尤其是阻水性较纯市场上PLA降解薄膜有了较大提升。

Description

一种高阻隔、抗静电、高爽滑双向拉伸可降解薄膜及其制备 方法
技术领域
本发明涉及降解包装膜技术领域，尤其涉及一种抗静电、高爽滑双向拉伸可降解薄膜及其制备方法。
背景技术
传统包装主要成分为石油提取物聚烯烃，而它们的降解至少要花费上百年时间，给环境带来极大负荷。随着国家相关政策的制定与人们环保意识的加强，可降解材料是大势所趋，它的应用也会越来越广泛。但众所周知，其中最具代表性的可降解材料聚乳酸的阻水性很差(20μm厚的BOPP薄膜水汽透过率数值小于5g/(m2·day)，同等厚度的BOPLA薄膜水汽透过率数值＞250g/(m2·day))。而对于包装行业来说，水汽阻隔性要做的尽量好。如何在满足双拉工艺制备降解薄膜的同时，又能增强聚乳酸薄膜的阻水性，对于降解包装膜来说显得尤为重要。
发明内容
有鉴于此，本发明要解决的技术问题在于提供一种高阻隔、抗静电、高爽滑双向拉伸可降解薄膜及其制备方法，具有优异的水汽阻隔性能。
为达到上述目的，本发明提供了一种抗静电、高爽滑双向拉伸可降解薄膜，包括依次复合的爽滑层、芯层、热封层；
其中，所述爽滑层和热封层为聚乳酸层；
所述芯层为聚乳酸和聚乙交酯的共混物层。
图1是本发明提供的高阻隔、抗静电、高爽滑双向拉伸可降解薄膜的结构示意图。
本发明提供的高阻隔、抗静电、高爽滑双向拉伸可降解薄膜，上下两个表层均为可生物降解材料聚乳酸，中间层降解材料为聚乳酸与聚乙交酯共混物，相比于市面上现有PLA薄膜，其水汽阻隔性得到较大提升。
本发明优选的，按照质量百分比计，制备所述爽滑层的原料包括：
Figure BDA0003345604150000011
Figure BDA0003345604150000021
更优选的，包括：
Figure BDA0003345604150000022
本发明中，上述各组分的总量满足100％。
本发明优选的，所述爽滑层的厚度为0.8～1.2μm。
本发明优选的，所述爽滑层中，所述聚乳酸选自PLA4060D与PLA3032D共混物。
所述PLA4060D与PLA3032D的质量比优选为0.63～0.75:1。
本发明优选的，所述爽滑层中，所述爽滑剂选自SAB06554PPR、IL2580SC和HIS01S中的一种或多种。
本发明优选的，所述爽滑层中，所述防粘剂选自ABVT22SC。
本发明优选的，所述爽滑层中，所述抗静电剂选自AT4023PP。
本发明优选的，按照质量百分比计，制备所述芯层的原料包括：
聚乳酸 85％～90％；
聚乙交酯 10％～15％；
更优选的，包括：
聚乳酸 85％；
聚乙交酯 15％。
本发明中，上述各组分的总量满足100％。
本发明优选的，所述芯层的厚度为19～20μm，更优选为19.5μm。
本发明优选的，所述芯层中，所述聚乳酸选自PLA4032D。
本发明优选的，所述芯层中还包括增韧剂。
本发明对所述增韧剂并无特殊限定，可以为本领域技术人员熟知的适用增韧剂。
本发明优选的，按照质量百分比计，制备所述热封层的原料包括：
Figure BDA0003345604150000031
更优选的，包括：
Figure BDA0003345604150000032
本发明中，上述各组分的总量满足100％。
本发明优选的，所述热封层的厚度为0.8～1.0μm，更优选为1.0μm。
本发明优选的，所述热封层中，所述聚乳酸选自PLA4060D与PLA4032D的混合物。
所述PLA4060D与PLA4032D的质量比优选为0.63～0.75：1。
本发明优选的，所述热封层中，所述防粘剂选自ABVT22SC。
本发明优选的，所述热封层中，所述抗静电剂选自AT4023PP。
本发明优选的，所述薄膜的总厚度为21～22μm，更优选为22μm。
本发明提供了上述高阻隔、抗静电、高爽滑双向拉伸可降解薄膜的制备方法，包括以下步骤：
S1)采用共混挤出的方法，分别制备爽滑层、芯层和热封层；
S2)将爽滑层、芯层和热封层采用三层共挤的方式复合；
S3)对复合膜进行流延、纵向拉伸、横向拉伸，然后牵引、收卷，得到抗静电、高爽滑双向拉伸可降解薄膜。
本发明首先通过双螺杆挤出机，将聚乳酸、爽滑剂、防粘剂、抗静电剂共混制备爽滑层。
通过双螺杆挤出机，将聚乳酸、聚乙交酯、增韧剂共混，制备芯层。
通过双螺杆挤出机，将聚乳酸、防粘剂、抗静电剂共混，制备热封层。
然后将爽滑层、芯层和热封层三层复合共挤出。
然后将得到的复合膜进行流延、纵向拉伸、横向拉伸，然后牵引、收卷。
本发明优选的，所述纵横向拉伸的工艺如下表1所示：
表1
Figure BDA0003345604150000041
本发明优选的，收卷后还包括分切、检验步骤。
与现有技术相比，本发明提供了一种高阻隔、抗静电、高爽滑双向拉伸可降解薄膜，包括依次复合的爽滑层、芯层、热封层；其中，所述爽滑层和热封层为聚乳酸层；所述芯层为聚乳酸和聚乙交酯的共混物层。
本发明制备的上述双向拉伸可降解薄膜，薄膜(20μm厚度)的水汽透过率＜50g/(m2·day)，纵向断裂伸长率(MD)保持在90％以上，横向断裂伸长率(TD)保持在110％以上。热封强度在80℃时在3.5N/15mm2以上，表面粗糙度在0.3以下，体积电阻率在1011Ω·cm，在满足可降解的同时，薄膜的其他性能也大大满足现有包装膜的要求，尤其是阻水性较纯市场上PLA降解薄膜有了较大提升。
附图说明
图1是本发明提供的高阻隔、抗静电、高爽滑双向拉伸可降解薄膜的结构示意图。
具体实施方式
为了进一步说明本发明，下面结合实施例对本发明提供的高阻隔、抗静电、高爽滑双向拉伸可降解薄膜及其制备方法进行详细描述。
实施例1
配方如表2所示：
表2实施例1各组分原料及性能参数
Figure BDA0003345604150000051
实施例2
配方如表3所示：
表3实施例2各组分原料及性能参数
Figure BDA0003345604150000052
Figure BDA0003345604150000061
实施例3
配方如表4所示：
表4实施例3各组分原料及性能参数
Figure BDA0003345604150000062
Figure BDA0003345604150000071
以上实施例1～3的具体制备工艺如下：
将3层物料按配比(分别如表2～表4所示)，分别加入对应的双螺杆挤出机中，设置双螺杆挤出机共混温度为175℃，制备出的熔体在70℃温度下流延复合，再在90℃温度下双向拉伸制备薄膜，最后经过大分切，小分切制备成品。
对成品进行性能检测，分别如表2～表4所示。
由以上实施例可以看出，本发明制备的可降解薄膜具有优异的高阻隔、抗静电、高爽滑性能。
以上实施例的说明只是用于帮助理解本发明的方法及其核心思想。应当指出，对于本技术领域的普通技术人员来说，在不脱离本发明原理的前提下，还可以对本发明进行若干改进和修饰，这些改进和修饰也落入本发明权利要求的保护范围内。

Claims (7)

1.一种高阻隔、抗静电、高爽滑双向拉伸可降解薄膜，包括依次复合的爽滑层、芯层、热封层；
其中，所述爽滑层和热封层为聚乳酸层；
所述芯层为聚乳酸和聚乙交酯的共混物层。
2.根据权利要求1所述的高阻隔、抗静电、高爽滑双向拉伸可降解薄膜，其特征在于，按照质量百分比计，
制备所述爽滑层的原料包括：
Figure FDA0003345604140000011
制备所述芯层的原料包括：
聚乳酸 85％～90％；
聚乙交酯 10％～15％；
制备所述热封层的原料包括：
Figure FDA0003345604140000012
3.根据权利要求2所述的高阻隔、抗静电、高爽滑双向拉伸可降解薄膜，其特征在于，所述爽滑层中，所述爽滑剂选自SAB06554PPR、IL2580SC和HIS01S中的一种或多种；
所述防粘剂选自ABVT22SC；
所述抗静电剂选自AT4023PP。
4.根据权利要求2所述的高阻隔、抗静电、高爽滑双向拉伸可降解薄膜，其特征在于，所述芯层中，所述聚乳酸选自PLA4032D。
5.根据权利要求2所述的高阻隔、抗静电、高爽滑双向拉伸可降解薄膜，其特征在于，所述热封层中，所述防粘剂选自ABVT22SC；
所述抗静电剂选自AT4023PP。
6.根据权利要求1所述的高阻隔、抗静电、高爽滑双向拉伸可降解薄膜，其特征在于，所述爽滑层的厚度为0.8～1.2μm；
所述芯层的厚度为19～20μm；
所述热封层的厚度为0.8～1.0μm；
所述薄膜的总厚度为21～22μm。
7.权利要求1～6任一项所述的高阻隔、抗静电、高爽滑双向拉伸可降解薄膜的制备方法，包括以下步骤：
S1)采用共混挤出的方法，分别制备爽滑层、芯层和热封层；
S2)将爽滑层、芯层和热封层采用三层共挤的方式复合；
S3)对复合膜进行流延、纵向拉伸、横向拉伸，然后牵引、收卷，得到抗静电、高爽滑双向拉伸可降解薄膜。
CN202111321909.3A 2021-11-09 2021-11-09 一种高阻隔、抗静电、高爽滑双向拉伸可降解薄膜及其制备方法 Pending CN114013146A (zh)

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