CN111171755A - 双向拉伸增粘预涂膜及其生产方法 - Google Patents

双向拉伸增粘预涂膜及其生产方法 Download PDF

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CN111171755A
CN111171755A CN201910982999.7A CN201910982999A CN111171755A CN 111171755 A CN111171755 A CN 111171755A CN 201910982999 A CN201910982999 A CN 201910982999A CN 111171755 A CN111171755 A CN 111171755A
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邵峥
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Ningbo Yingrui Polymerization Technology Co Ltd
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Abstract

本发明公开了一种双向拉伸增粘预涂膜，包括从外至内依次设置的疏水疏油层、基层、底涂剂层和热熔胶层和增粘层；疏水疏油层为三层结构，其包括从外至内依次设置的纳米二氧化硅层、氟硅烷层以及由氨基丙烯酸树脂、二甲苯和纳米二氧化硅组成的保护层；基层由聚丙烯、抗氧剂和阻燃剂组成；底涂剂层由聚乙烯亚胺水溶液和酒精组成；热熔胶层为乙烯‑醋酸乙烯共聚物；增粘层由羧甲基纤维素钠、甘油、羟苯乙酯醇溶液和蒸馏水组成。基层与热熔胶层的结合强度高，增粘层能起到增粘效果，且该预涂膜功能多样。

Description

双向拉伸增粘预涂膜及其生产方法
技术领域
本发明涉及预涂膜技术领域，具体讲是一种双向拉伸增粘预涂膜及其生产方法。
背景技术
预涂膜是一种用于印刷产品的软包装材料,它先由预涂膜加工厂根据使用规格、幅面，将胶液涂布在薄膜上复卷后供使用厂家选择，而后再与印刷品进行复合。现有技术的预涂膜其结构一般由基材和黏合剂胶层构成，往往存在以下问题：基材直接与黏合剂结合，结合强度较低；功能较为单一，防护效果差；没有增粘效果，使用时容易出现粘接不牢问题。
发明内容
鉴于上述现有技术的缺陷，本发明的一个目的在于：提供一种双向拉伸增粘预涂膜。
为解决上述问题，本发明的技术解决方案是：双向拉伸增粘预涂膜，包括从外至内依次设置的疏水疏油层、基层、底涂剂层和热熔胶层和增粘层；
疏水疏油层为三层结构，其包括从外至内依次设置的纳米二氧化硅层、氟硅烷层以及由氨基丙烯酸树脂、二甲苯和纳米二氧化硅组成的保护层；
基层由聚丙烯、抗氧剂和阻燃剂组成；
底涂剂层由聚乙烯亚胺水溶液和酒精组成；
热熔胶层为乙烯-醋酸乙烯共聚物；
增粘层由羧甲基纤维素钠、甘油、羟苯乙酯醇溶液和蒸馏水组成。
进一步地，保护层中纳米二氧化硅的含量为15％。
进一步地，底涂剂层中聚乙烯亚胺、水和酒精的重量比为15：4：1。
进一步地，所述抗氧剂由抗氧剂1010和抗氧剂168组成。
进一步地，所述阻燃剂为硼酸锌。
本发明还提供一种上述双向拉伸增粘预涂膜的其制备方法，包括以下步骤：
(1)将聚丙烯、抗氧剂和阻燃剂合后经双螺杆挤出机塑化，然后将熔融态熔体送入模头，并在模头口形成熔融态片材，然后用气刀将片材贴附于激冷辊上骤冷形成未定型的片材，然后经过水浴冷却后将片材定型形成铸片，铸片再分别经过纵拉机和横向拉伸机，将片材拉制成薄膜，制得基层；
(2)对基层表面作电晕处理；
(3)将聚乙烯亚胺水溶液和酒精混合均匀后涂在基层内表面，涂好后将基材进行干燥处理；
(4)以二甲苯为溶液，将氨基丙烯酸树脂、二甲苯和纳米二氧化硅高速剪切搅拌混合，制得悬浮液，然后喷涂在基层外表面，再喷上一层氟硅烷溶液，最后再喷上一层纳米二氧化硅，静置后放入烘箱固化；
(5)将乙烯-醋酸乙烯共聚物制成热熔胶，用一定量的臭氧对熔融状态的热熔胶进行强氧化处理，然后在热熔胶还处于熔融状态时，通过复合辊筒将基层和热熔胶挤压粘合在一起，然后冷却定型；
(6)取羧甲基纤维素钠倒入盛有适量蒸馏水的容器中，让羧甲基纤维素钠自然溶胀，然后稍微加热使其完全溶解，将羟苯乙酯醇溶液、甘油加入到容器中，再将剩余的蒸馏水加入容器中，搅拌均匀，制得羧甲基纤维素钠胶浆，最后通过涂布辊涂布方式将羧甲基纤维素钠胶浆涂布于热熔胶层的表面，形成增粘层。
进一步地，对基层表面作电晕处理后，用臭氧对基材进行强氧化处理。
本发明的有益效果是：
以二甲苯为溶液，氨基丙烯酸树脂为成膜树脂，再与纳米二氧化硅制成悬浮液，喷涂在基层上后，再依次喷上一层氟硅烷和一层纳米二氧化硅，可以制得透明性好、结合力强、硬度高的疏水疏油层，具有三重防护效果；
抗氧剂能提高基层的热氧化稳定性，阻燃剂可使基层不燃或难燃烧，从而提高预涂膜的使用寿命；
底涂剂层中的聚乙烯亚胺可以靠其中的极性基团“氨基”与基层表面和热熔胶层的极性官能团发生化学反应，或与羟基形成氢键，依靠这些新物质或键能把基层和热熔胶层很好地结合起来，结合强度高；
由羧甲基纤维素钠、甘油、羟苯乙酯醇溶液和蒸馏水组成的增粘层与热熔胶结合后，可以增加预涂膜的粘性，起到增粘效果，提高预涂膜使用时的粘接牢固度。
附图说明
图1为本发明双向拉伸增粘预涂膜的结构示意图。
图中所示：1—疏水疏油层，11—纳米二氧化硅层，12—氟硅烷层，13—保护层，2—基层，3—底涂剂层，4—热熔胶层，5—增粘层。
具体实施方式
为比较直观、完整地理解本发明的技术方案，现就结合本发明附图进行非限制性的特征说明如下：
如图1所示，双向拉伸增粘预涂膜，包括从外至内依次设置的疏水疏油层1、基层2、底涂剂层3和热熔胶层4和增粘层5；
疏水疏油层1为三层结构，其包括从外至内依次设置的纳米二氧化硅层11、氟硅烷层12以及由氨基丙烯酸树脂、二甲苯和纳米二氧化硅组成的保护层13；
基层2由聚丙烯、抗氧剂和阻燃剂组成，阻燃剂为硼酸锌；
底涂剂层3由聚乙烯亚胺水溶液和酒精组成；
热熔胶层4为乙烯-醋酸乙烯共聚物；
增粘层5由羧甲基纤维素钠、甘油、羟苯乙酯醇溶液和蒸馏水组成。
保护层13中纳米二氧化硅的含量为15％。纳米二氧化硅含量与疏水疏油层1的铅笔硬度与附着力关系如下表所示：
疏水疏油层组成 铅笔硬度(H) 附着力(B)
0(质量分数)纳米二氧化硅 3 5
0(质量分数)纳米二氧化硅+氟硅烷 3 5
5％(质量分数)纳米二氧化硅+氟硅烷 6 5
10％(质量分数)纳米二氧化硅+氟硅烷 6 5
15％(质量分数)纳米二氧化硅+氟硅烷 6 5
底涂剂层3中聚乙烯亚胺、水和酒精的重量比为15：4：1。酒精的快速挥发会带走部分水分，为使水分能够快速被烘干排出，所以加入适量酒精。
抗氧剂由抗氧剂1010和抗氧剂168组成。抗氧剂1010作为主抗氧剂，抗氧剂168作为辅助抗氧剂，该复合配方能有效地提基层2的热氧化稳定性。
本发明还提供一种上述双向拉伸增粘预涂膜的其制备方法，包括以下步骤：
(1)将聚丙烯、抗氧剂和阻燃剂合后经双螺杆挤出机塑化，然后将熔融态熔体送入模头，并在模头口形成熔融态片材，然后用气刀将片材贴附于激冷辊上骤冷形成未定型的片材，然后经过水浴冷却后将片材定型形成铸片，铸片再分别经过纵拉机和横向拉伸机，将片材拉制成薄膜，制得基层2；
(2)对基层2表面作电晕处理；电晕处理后，用臭氧对基材进行强氧化处理，产生一些极性基团，附着在基层2表面，从而给基层2表面带来一定的活性，以便于基材与底涂剂层3结合；
(3)将聚乙烯亚胺水溶液和酒精混合均匀后涂在基层2内表面，涂好后将基材进行干燥处理；
(4)以二甲苯为溶液，将氨基丙烯酸树脂、二甲苯和纳米二氧化硅高速剪切搅拌混合，制得悬浮液，然后喷涂在基层2外表面，再喷上一层氟硅烷溶液，最后再喷上一层纳米二氧化硅，静置后放入烘箱固化；
(5)将乙烯-醋酸乙烯共聚物制成热熔胶，用一定量的臭氧对熔融状态的热熔胶进行强氧化处理，然后在热熔胶还处于熔融状态时，通过复合辊筒将基层2和热熔胶挤压粘合在一起，然后冷却定型；因为乙烯-醋酸乙烯共聚物本身极性也较弱，这不足以使其与底涂剂层3及基层2很好的结合，因此需要用臭氧对乙烯-醋酸乙烯共聚物进行强氧化，生成一定量为极性基团后再进行复合。
(6)取羧甲基纤维素钠倒入盛有适量蒸馏水的容器中，让羧甲基纤维素钠自然溶胀，然后稍微加热使其完全溶解，将羟苯乙酯醇溶液、甘油加入到容器中，再将剩余的蒸馏水加入容器中，搅拌均匀，制得羧甲基纤维素钠胶浆，最后通过涂布辊涂布方式将羧甲基纤维素钠胶浆涂布于热熔胶层4的表面，形成增粘层5。
本发明以二甲苯为溶液，氨基丙烯酸树脂为成膜树脂，再与纳米二氧化硅制成悬浮液，喷涂在基层2上后，再依次喷上一层氟硅烷和一层纳米二氧化硅，可以制得透明性好、结合力强、硬度高的疏水疏油层1，具有三重防护效果；
抗氧剂能提高基层2的热氧化稳定性，阻燃剂可使基层2不燃或难燃烧，从而提高预涂膜的使用寿命；
底涂剂层3中的聚乙烯亚胺可以靠其中的极性基团“氨基”与基层2表面和热熔胶层4的极性官能团发生化学反应，或与羟基形成氢键，依靠这些新物质或键能把基层2和热熔胶层4很好地结合起来，结合强度高；
由羧甲基纤维素钠、甘油、羟苯乙酯醇溶液和蒸馏水组成的增粘层5与热熔胶结合后，可以增加预涂膜的粘性，起到增粘效果，而则甘油起增稠作用，提高预涂膜使用时的粘接牢固度。

Claims (7)

1.双向拉伸增粘预涂膜，其特征在于包括从外至内依次设置的疏水疏油层、基层、底涂剂层和热熔胶层和增粘层；
疏水疏油层为三层结构，其包括从外至内依次设置的纳米二氧化硅层、氟硅烷层以及由氨基丙烯酸树脂、二甲苯和纳米二氧化硅组成的保护层；
基层由聚丙烯、抗氧剂和阻燃剂组成；
底涂剂层由聚乙烯亚胺水溶液和酒精组成；
热熔胶层为乙烯-醋酸乙烯共聚物；
增粘层由羧甲基纤维素钠、甘油、羟苯乙酯醇溶液和蒸馏水组成。
2.根据权利要求1所述的双向拉伸增粘预涂膜，其特征在于：保护层中纳米二氧化硅的含量为15％。
3.根据权利要求1所述的双向拉伸增粘预涂膜，其特征在于：底涂剂层中聚乙烯亚胺、水和酒精的重量比为15：4：1。
4.根据权利要求1所述的双向拉伸增粘预涂膜，其特征在于：所述抗氧剂由抗氧剂1010和抗氧剂168组成。
5.根据权利要求1所述的双向拉伸增粘预涂膜，其特征在于：所述阻燃剂为硼酸锌。
6.根据权利要求1所述的双向拉伸增粘预涂膜的制备方法，其特征在于包括以下步骤：
(1)将聚丙烯、抗氧剂和阻燃剂合后经双螺杆挤出机塑化，然后将熔融态熔体送入模头，并在模头口形成熔融态片材，然后用气刀将片材贴附于激冷辊上骤冷形成未定型的片材，然后经过水浴冷却后将片材定型形成铸片，铸片再分别经过纵拉机和横向拉伸机，将片材拉制成薄膜，制得基层；
(2)对基层表面作电晕处理；
(3)将聚乙烯亚胺水溶液和酒精混合均匀后涂在基层内表面，涂好后将基材进行干燥处理；
(4)以二甲苯为溶液，将氨基丙烯酸树脂、二甲苯和纳米二氧化硅高速剪切搅拌混合，制得悬浮液，然后喷涂在基层外表面，再喷上一层氟硅烷溶液，最后再喷上一层纳米二氧化硅，静置后放入烘箱固化；
(5)将乙烯-醋酸乙烯共聚物制成热熔胶，用一定量的臭氧对熔融状态的热熔胶进行强氧化处理，然后在热熔胶还处于熔融状态时，通过复合辊筒将基层和热熔胶挤压粘合在一起，然后冷却定型；
(6)取羧甲基纤维素钠倒入盛有适量蒸馏水的容器中，让羧甲基纤维素钠自然溶胀，然后稍微加热使其完全溶解，将羟苯乙酯醇溶液、甘油加入到容器中，再将剩余的蒸馏水加入容器中，搅拌均匀，制得羧甲基纤维素钠胶浆，最后通过涂布辊涂布方式将羧甲基纤维素钠胶浆涂布于热熔胶层的表面，形成增粘层。
7.根据权利要求6所述的双向拉伸增粘预涂膜的制备方法，其特征在于：对基层表面作电晕处理后，用臭氧对基材进行强氧化处理。
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