CN107932942B - 一种用于精密打印的bopp薄膜及其制备方法 - Google Patents

一种用于精密打印的bopp薄膜及其制备方法 Download PDF

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CN107932942B
CN107932942B CN201711353068.8A CN201711353068A CN107932942B CN 107932942 B CN107932942 B CN 107932942B CN 201711353068 A CN201711353068 A CN 201711353068A CN 107932942 B CN107932942 B CN 107932942B
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梁雁扬
邱镇贤
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GUANGDONG WEIFU PACKAGING MATERIAL CO Ltd
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Abstract

本发明公开了一种用于精密打印的BOPP薄膜及其制备方法，所述薄膜由改性功能层、透明表层、支撑芯层和透明表层采用四层共挤方式复合而成，各层比例为：2:1.5:5:1.5，所述薄膜各层的原料配比为：改性功能层：共聚聚丙烯91%—96%，特殊改性料2%—5%，防粘连剂1%—2%，抗氧化剂1%—2%；支撑芯层：均聚聚丙烯85%—92%，增刚剂3%—5%，抗静电剂2%—5%，爽滑剂3%—5%；透明表层：共聚聚丙烯75%—88%，爽滑剂4%—10%，防粘连剂5%—10%，抗氧化剂3%—5%。本发明通过对原料的改性、调配和工艺的相应调整，使各层之间相互补充作用，在保证BOPP薄膜固有物理性能的前提下，有效增强薄膜功能层一侧的表面张力，并减缓其衰减速度，提高油墨的附着力和着色力，达到精密打印的性能要求。

Description

一种用于精密打印的BOPP薄膜及其制备方法
技术领域
本发明属于BOPP薄膜加工技术领域，具体涉及一种用于精密打印的BOPP薄膜及其制备方法。
背景技术
PP材料加工适应性强，本身具有优异的光学性能、材料拉伸性能和热稳定性能，多样化的产品类型越来越受到食品包装。日用品包装等加工厂商的青睐。近几年来，BOPP厂商逐渐将目光关注到条码精密打印等高尖端技术领域。
条码精密打印中面纸是标签打印内容的承载体，市场上常用的面纸按其材质主要有铜质纸、热敏纸、PET、PVC等，以BOPP薄膜为面纸的条码打印应用因为受到PP本身非极性的材料性质而表面张力相对其他材料较差，因此造成的油墨附着不良，精密打印识别效果差而推广受到阻碍。
发明内容
为解决现有技术的不足，本发明提供一种用于精密打印的BOPP薄膜及其制备方法，通过对原料的改性、调配和工艺的调整，使其在保有原先优良物理性能的同时，达到精密打印行业的油墨附着要求。
为实现上述技术方案，本发明提供的技术方案为：
一种用于精密打印的BOPP薄膜，所述薄膜由改性功能层、透明表层、支撑芯层和透明表层采用四层共挤方式复合而成，各层的比例为：2:1.5:5:1.5，所述各层的原料配比如下：改性功能层：共聚聚丙烯91%—96%，特殊改性料2%—5%，防粘连剂1%—2%，抗氧化剂1%—2%；支撑芯层：均聚聚丙烯85%—92%，增刚剂3%—5%，抗静电剂2%—5%，爽滑剂3%—5%；透明表层：共聚聚丙烯75%—88%，爽滑剂4%—10%，防粘连剂5%—10%，抗氧化剂3%—5%。
进一步的，所述特殊改性料由pp接枝丙烯酸和pp接枝马来酸酐混合配置而成，其混合比例为1:1。
更进一步的，所述各层中的共聚聚丙烯和均聚聚丙烯原料的洁净度和等规度均在99%以上。
进一步的，所述防粘连剂为聚硅氧烷。
更进一步的，述爽滑剂为硅酮。
一种用于精密打印的BOPP薄膜的制备方法，所述方法包括以下步骤：
（1）根据权利要求1搜索的配方将各层原料按配比称取，再经过混合均匀、干燥处理后加入各自的螺杆挤出机中，物料在螺杆挤出机中进行熔融塑化；
（2）物料熔融塑化后，将四层聚合物熔体经过过滤器过滤，然后在模头处汇合挤出，再依次进行冷却、铸片、纵向、横向拉伸和电晕处理，使得层、电晕处理后薄膜改性功能层表面张力达到50—55达因；
（3）最后将薄膜依次进行自动收卷和时效处理工序，再分切成客户需求的规格得到成品，入库。
进一步的，所述物料在螺杆挤出机中的熔融温度为255—275℃。
更进一步的，所述纵向拉伸温度为80—110℃，拉伸倍数为4—6倍；所述横向拉伸温度为160—210℃，拉伸倍数为5—8倍。
与现有技术相比，本发明具有以下有益效果：
1、本发明选用洁净度和等规度均在99%以上的pp料，能够减少因原料杂质结晶不良等造成的印刷识别混淆，同时能够在保证薄膜表面平整度的基础上，严格控制晶点、白点等异物点，有效提高产品质量和生产过程中设备的负担；
2、通过在改性功能层中加入特殊改性料，能够有效弥补解决pp材料非极性受限的表面张力，使改性功能层表面张力达到50—55达因，配合电晕处理和固化工序，有效减缓表面张力衰减的速度；
3、各层之间相互补充作用，使得BOPP薄膜能够保持固有的物理性能，提高其表面的油墨附着力和着色力，使得打印效果清晰，表现良好。
具体实施方式
下面结合具体实施例对本发明作进一步的详细说明。
实施例1
一种用于精密打印的BOPP薄膜，所述薄膜由改性功能层、透明表层、支撑芯层和透明表层采用四层共挤方式复合而成，各层的比例为：2:1.5:5:1.5，所述各层的原料配比如下：改性功能层：共聚聚丙烯91%，特殊改性料5%，防粘连剂2%，抗氧化剂2%；支撑芯层：均聚聚丙烯85%，增刚剂5%，抗静电剂5%，爽滑剂5%；透明表层：共聚聚丙烯75%，爽滑剂10%，防粘连剂10%，抗氧化剂5%。
进一步的，所述特殊改性料由pp接枝丙烯酸和pp接枝马来酸酐混合配置而成，其混合比例为1:1。
更进一步的，所述各层中的共聚聚丙烯和均聚聚丙烯原料的洁净度和等规度均在99%以上。
进一步的，所述防粘连剂为聚硅氧烷。
更进一步的，述爽滑剂为硅酮。
实施例2
一种用于精密打印的BOPP薄膜，所述薄膜由改性功能层、透明表层、支撑芯层和透明表层采用四层共挤方式复合而成，各层的比例为：2:1.5:5:1.5，所述各层的原料配比如下：改性功能层：共聚聚丙烯96%，特殊改性料2%，防粘连剂1%，抗氧化剂1%；支撑芯层：均聚聚丙烯92%，增刚剂3%，抗静电剂2%，爽滑剂3%；透明表层：共聚聚丙烯88%，爽滑剂4%，防粘连剂5%，抗氧化剂3%。
进一步的，所述特殊改性料由pp接枝丙烯酸和pp接枝马来酸酐混合配置而成，其混合比例为1:1。
更进一步的，所述各层中的共聚聚丙烯和均聚聚丙烯原料的洁净度和等规度均在99%以上。
进一步的，所述防粘连剂为聚硅氧烷。
更进一步的，述爽滑剂为硅酮。
实施例3
实施例1、2中任一例中的一种用于精密打印的BOPP薄膜的制备方法，所述方法包括以下步骤：
（1）根据权利要求1搜索的配方将各层原料按配比称取，再经过混合均匀、干燥处理后加入各自的螺杆挤出机中，物料在螺杆挤出机中进行熔融塑化；
（2）物料熔融塑化后，将四层聚合物熔体经过过滤器过滤，然后在模头处汇合挤出，再依次进行冷却、铸片、纵向、横向拉伸和电晕处理，使得层、电晕处理后薄膜改性功能层表面张力达到50—55达因；
（3）最后将薄膜依次进行自动收卷和时效处理工序，再分切成客户需求的规格得到成品，入库。
进一步的，所述物料在螺杆挤出机中的熔融温度为255—275℃。
更进一步的，所述纵向拉伸温度为80—110℃，拉伸倍数为4—6倍；所述横向拉伸温度为160—210℃，拉伸倍数为5—8倍。
表1为实施例1和实施例2通过实施例3的制备方法所制得的产品与现有市场上产品的表面张力衰减数值：
表1
Figure DEST_PATH_IMAGE002
由上述表格可以看出，本发明所制得的产品原始表面张力比现有产品高，且衰减速度与现有产品相比较缓，有利于产品的长时间储存。
本发明各层之间相互补充作用，使得BOPP薄膜能够保持固有的物理性能，提高其表面的油墨附着力和着色力，使得打印效果清晰，表现良好。
以上结合实施例对本发明做出详细说明，但本发明不局限于所描述的实施方式。对本领域的普通技术人员而言，在本发明的原理和技术思想的范围内，对这些实施方式进行多种变化、修改、替换和变型仍落入本发明的保护范围内。

Claims (6)

1.一种用于精密打印的BOPP薄膜，其特征在于，所述薄膜由改性功能层、透明表层、支撑芯层和透明表层采用四层共挤方式复合而成，各层的比例为：2:1.5:5:1.5，所述各层的原料配比如下：改性功能层：共聚聚丙烯91%—96%，特殊改性料2%—5%，防粘连剂1%—2%，抗氧化剂1%—2%；支撑芯层：均聚聚丙烯85%—92%，增刚剂3%—5%，抗静电剂2%—5%，爽滑剂3%—5%；透明表层：共聚聚丙烯75%—88%，爽滑剂4%—10%，防粘连剂5%—10%，抗氧化剂3%—5%；所述特殊改性料由pp接枝丙烯酸和pp接枝马来酸酐混合配置而成，其混合比例为1:1；所述一种用于精密打印的BOPP薄膜的制备方法包括以下步骤：
（1）将各层原料按配比称取，再经过混合均匀、干燥处理后加入各自的螺杆挤出机中，物料在螺杆挤出机中进行熔融塑化；
（2）物料熔融塑化后，将四层聚合物熔体经过过滤器过滤，然后在模头处汇合挤出，再依次进行冷却、铸片、纵向、横向拉伸和电晕处理，使得层电晕处理后薄膜改性功能层表面张力达到50—55达因；
（3）最后将薄膜依次进行自动收卷和时效处理工序，再分切成客户需求的规格得到成品，入库。
2.根据权利要求1所述的一种用于精密打印的BOPP薄膜，其特征在于，所述各层中的共聚聚丙烯和均聚聚丙烯原料的洁净度和等规度均在99%以上。
3.根据权利要求1所述的一种用于精密打印的BOPP薄膜，其特征在于，所述防粘连剂为聚硅氧烷。
4.根据权利要求1所述的一种用于精密打印的BOPP薄膜，其特征在于，所述爽滑剂为硅酮。
5.根据权利要求1所述的一种用于精密打印的BOPP薄膜，其特征在于，所述步骤（1）物料在螺杆挤出机中的熔融温度为255—275℃。
6.根据权利要求1所述的一种用于精密打印的BOPP薄膜，其特征在于，所述步骤（2）纵向拉伸温度为80—110℃，拉伸倍数为4—6倍；所述横向拉伸温度为160—210℃，拉伸倍数为5—8倍。
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CN103980622A (zh) * 2014-03-22 2014-08-13 中山百能思塑料科技有限公司 一种bopp薄膜用高表面张力复合型爽滑抗粘连母料及其生产工艺
CN104210205A (zh) * 2014-08-22 2014-12-17 湛江包装材料企业有限公司 一种冷转移卷烟商标纸专用bopp薄膜及其制备方法
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