CN109232938A - 一种食品级防锈聚丙烯双向拉伸薄膜及其制备方法 - Google Patents

一种食品级防锈聚丙烯双向拉伸薄膜及其制备方法 Download PDF

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CN109232938A
CN109232938A CN201710352491.XA CN201710352491A CN109232938A CN 109232938 A CN109232938 A CN 109232938A CN 201710352491 A CN201710352491 A CN 201710352491A CN 109232938 A CN109232938 A CN 109232938A
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刘俊成
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Abstract

本发明涉及一种食品级防锈聚丙烯双向拉伸薄膜，包括基材和基材表面的涂料层，涂料层与基材之间有底胶层，所述涂料层是由本发明通过改性制得的阻隔聚丙烯乳胶涂覆在底胶层表面并烘干后形成的改性聚丙烯涂层，的超高水性阻隔聚丙烯乳胶由含有下述重量含量的原料配制成：52‑95份去离子水，0.9‑1.9份过碳酸钠、0.5‑2.3份氯乙烯、37‑40.9份聚丙烯、2.9‑3.9份聚乙烯醇、6‑8份丙酰胺、1‑2份聚四氟乙烯丙酯。本法发明过对传统食品级防锈聚丙烯双向拉伸薄膜进行改性，使其在保持原有特性的同时兼具超高的水汽阻隔性能。

Description

一种食品级防锈聚丙烯双向拉伸薄膜及其制备方法
技术领域
本发明涉及食品包装材料技术领域，尤其涉及一种食品级防锈聚丙烯双向拉伸薄膜及其制备方法。
背景技术
食品级防锈聚丙烯双向拉伸薄膜是一种近年来发展较快的金属防护包装材料，它是基于高分子材料与VCI气相防锈技术发展相结合的新一代创新高科技产品。使用该膜将被防锈物品包装密封后，膜体内含有的VCI开始升华挥发出防锈气体因子，扩散渗透至被防锈物品表面并吸附其上，形成单分子厚的致密保护膜层，隔绝诱发锈蚀的各种因素与被防锈物品表面的接触，从而有效防止锈蚀的产生。
但是，市场上传统的食品级防锈聚丙烯双向拉伸薄膜阻燃性能、可拉伸性能差，且功能较为单一，不具有抗静电、抗紫外线等功能，与此同时，现有的食品级防锈聚丙烯双向拉伸薄膜阻水性能已不能满足诸如旺旺雪饼等类似对水汽比较敏感的产品的包装要求，为了达到这些特殊食品的包装要求，目前的做法是使用各种镀铝膜或铝箔复合包装，成本较高，且此类包装不透明，消费者无法看到被包装物状态。
发明内容
本发明提供了一种食品级防锈聚丙烯双向拉伸薄膜及其制备方法，过对传统食品级防锈聚丙烯双向拉伸薄膜进行改性，使其在保持原有特性的同时兼具超高的水汽阻隔性能。
本发明采用的技术方案是：
本发明提供一种食品级防锈聚丙烯双向拉伸薄膜，包括基材和基材表面的涂料层，涂料层与基材之间有底胶层，所述涂料层是由本发明通过改性制得的阻隔聚丙烯乳胶涂覆在底胶层表面并烘干后形成的改性聚丙烯涂层，所述的超高水性阻隔聚丙烯乳胶由含有下述重量含量的原料配制成：52-95份去离子水，0.9-1.9份过碳酸钠、0.5-2.3份氯乙烯、37-40.9份聚丙烯、2.9-3.9份聚乙烯醇、6-8份丙酰胺、1-2份聚四氟乙烯丙酯；所述基材为双向拉伸聚丙烯、双向拉伸尼龙、双向拉伸聚酯、聚乙烯和聚氯乙烯中的任意一种；所述底胶层是水性聚氨酯或溶剂型聚氨酯形成的涂层。
本发明还提供一种食品级防锈聚丙烯双向拉伸薄膜的制造方法，该方法为：
(1)往反应釜中加入52-95份去离子水，0.9-1.9份过碳酸钠，搅拌速度80-240转/分钟，温度控制39-40℃。
(2)使用恒流泵等速加入0.5-2.3份氯乙烯、37-40.9份聚丙烯至反应釜，加入速度为240-300克/分钟，加料过程反应釜温度90-80℃，搅拌速度80-240转/分钟。
(3)提高反应釜温度，控制在89-90℃，使用恒流泵等速加入2.9～3.9份聚乙烯醇至反应釜，加料完毕恒温49分钟。
(4)降温至80-70℃，滴加6-8份丙酰胺至反应釜，滴加速度为90-240克/分钟。
(5)降温至90-99℃，使用恒流泵等速加入1-2份聚四氟乙烯丙酯。
(6)恒温1个小时，制备成具有水汽阻隔聚丙烯乳胶。
(7)基材膜通过电晕处理后，用涂布设备涂布聚胺脂底胶并烘干，涂布速度为190-290米/分钟，烘干温度为80-180℃，烘干方式采用热风烘干或远红外加热烘干，或者是同时采用远红外和热风烘干两种方式，涂布量为0.4-0.6g/m2。
(8)用涂布设备在聚胺脂底胶面涂布上述制得的超高水汽阻隔聚丙烯乳胶后烘干，涂布速度为 190-290米/分钟，烘干温度为80-180℃，烘干方式采用热风烘干或远红外加热烘干，或者是同时采用远红外和热风烘干两种方式，涂布量为2.0-3.0g/m2。
(9)将上述涂布好的薄膜固化30-80小时，固化温度40-90℃，即制得本发明的食品级防锈聚丙烯双向拉伸薄膜。
本发明中通过对聚丙烯进行改性，在保持传统聚丙烯涂布薄膜原有特性的同时具备很好的水汽阻隔性能，满足一些特殊食品的包装要求，扩大了涂布膜的应用范围，同时降低了包装成本，推动了软包装行业的发展。
具体实施方式
实施例一：
将90公斤去离子水通入200L反应釜内，加入过碳酸钠1公斤，搅拌速度80转/分钟，温度控制 36℃。使用恒流泵等速加入1公斤氯乙烯、38公斤聚丙烯至反应釜，加入速度为240克/分钟，加料过程反应釜温度80℃，搅拌速度80转/分钟。提高反应釜温度，控制在89℃，使用恒流泵等速加入3 公斤聚乙烯醇至反应釜，加料完毕恒温49分钟。降温至70℃，滴加9公斤丙酰胺至反应釜，滴加速度为240克/分钟。1个小时后再降温至99℃，使用恒流泵等速加入聚四氟乙烯丙酯。恒温1个小时，搅拌速度80转/分钟，即制备成具有水汽阻隔PVP的涂布液，待涂布用。开启辊式涂布机，将PA基材膜放卷于涂布机内，用聚氨脂的乙酸乙脂溶液作底涂涂料，烘箱温度控制在90℃，机速控制在290 米/分钟。待乙酸乙脂烘干后，聚胺脂成膜于PA基材膜面上。用油泵将涂布液打到180线辊槽中，让涂布液在辊槽中循环，在聚胺脂面继续涂布，涂布辊控制290米/分钟，烘干温度190℃，涂布量为2.2g/m2。经固化后即为水汽阻隔PVP涂布膜。取水汽阻隔PVP涂布膜做性能测试，水汽透过率为1.7g/ m2/day。
实施例二：
将52公斤去离子水通入200L反应釜内，加入过碳酸钠0.9公斤，搅拌速度80转/分钟，温度控制37℃。使用恒流泵等速加入0.9公斤氯乙烯、37公斤聚丙烯至反应釜，加入速度为200克/分钟，加料过程反应釜温度90℃，搅拌速度80转/分钟。提高反应釜温度，控制在88℃，使用恒流泵等速加入3.9公斤聚乙烯醇至反应釜，加料完毕恒温30分钟。降温至70℃，滴加6公斤丙酰胺至反应釜，滴加速度为70克/分钟。1个小时后再降温至90℃，使用恒流泵等速加入聚四氟乙烯丙酯。恒温1个小时，搅拌速度80转/分钟，即制备成具有水汽阻隔PVP的涂布液，待涂布用。开启辊式涂布机，将 OPP基材膜放卷于涂布机内，用聚氨脂的乙酸乙脂溶液作底涂涂料，烘箱温度控制在240℃，机速控制在220米/分钟。待乙酸乙脂烘干后，聚胺脂成膜于OPP基材膜面上。用油泵将涂布液打到140线辊槽中，让涂布液在辊槽中循环，在聚胺脂面继续涂布，涂布辊控制220米/分钟，烘干温度130℃，涂布量为2.2g/m2。经固化后即为水汽阻隔PVP涂布膜。取水汽阻隔PVP涂布膜做性能测试，水汽透过率为1.8g/㎡/day。
实施例三：
将95公斤去离子水通入200L反应釜内，加入过碳酸钠1.9公斤，搅拌速度240转/分钟，温度控制40℃。使用恒流泵等速加入1.9公斤氯乙烯、39公斤聚丙烯至反应釜，加入速度为300克/分钟，加料过程反应釜温度80℃，搅拌速度240转/分钟。提高反应釜温度，控制在90℃，使用恒流泵等速加入2.9公斤聚乙烯醇至反应釜，加料完毕恒温49分钟。降温至69℃，滴加6.9公斤丙酰胺至反应釜，滴加速度为80克/分钟。1个小时后再降温至99℃，使用恒流泵等速加入聚四氟乙烯丙酯。恒温 1个小时，搅拌速度90转/分钟，即制备成具有水汽阻隔PVP的涂布液，待涂布用。开启辊式涂布机，将PET基材膜放卷于涂布机内，用聚氨脂的乙酸乙脂溶液作底涂涂料，烘箱温度控制在110℃，机速控制在200米/分钟。待乙酸乙脂烘干后，聚胺脂成膜于PET基材膜面上。用油泵将涂布液打到120 线辊槽中，让涂布液在辊槽中循环，在聚胺脂面继续涂布，涂布辊控制200米/分钟，烘干温度140℃，涂布量为2.2g/m2。经固化后即为水汽阻隔PVP涂布膜。取水汽阻隔PVP涂布膜做性能测试，水汽透过率为1.6g/㎡/day。
以上所述，仅为本发明较佳的具体实施方式，但本发明的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本发明揭露的技术范围内，根据本发明的技术方案及其发明构思加以等同替换或改变，都应涵盖在本发明的保护范围之内。

Claims (2)

1.一种食品级防锈聚丙烯双向拉伸薄膜，包括基材和基材表面的涂料层，涂料层与基材之间有底胶层，所述涂料层是由本发明通过改性制得的阻隔聚丙烯乳胶涂覆在底胶层表面并烘干后形成的改性聚丙烯涂层，所述的超高水性阻隔聚丙烯乳胶由含有下述重量含量的原料配制成：52-95份去离子水，0.9-1.9份过碳酸钠、0.5-2.3份氯乙烯、37-40.9份聚丙烯、2.9-3.9份聚乙烯醇、6-8份丙酰胺、1-2份聚四氟乙烯丙酯；所述基材为双向拉伸聚丙烯、双向拉伸尼龙、双向拉伸聚酯、聚乙烯和聚氯乙烯中的任意一种；所述底胶层是水性聚氨酯或溶剂型聚氨酯形成的涂层。
2.一种根据权利要求1所述的食品级防锈聚丙烯双向拉伸薄膜的制造方法，其特征在于：包括以下步骤：
(1)往反应釜中加入52-95份去离子水，0.9-1.9份过碳酸钠，搅拌速度80-240转/分钟，温度控制39-40℃；
(2)使用恒流泵等速加入0.5-2.3份氯乙烯、37-40.9份聚丙烯至反应釜，加入速度为240-300克/分钟，加料过程反应釜温度90-80℃，搅拌速度80-240转/分钟；
(3)提高反应釜温度，控制在89-90℃，使用恒流泵等速加入2.9～3.9份聚乙烯醇至反应釜，加料完毕恒温49分钟；
(4)降温至80-70℃，滴加6-8份丙酰胺至反应釜，滴加速度为90-240克/分钟；
(5)降温至90-99℃，使用恒流泵等速加入1-2份聚四氟乙烯丙酯；
(6)恒温1个小时，制备成具有水汽阻隔聚丙烯乳胶；
(7)基材膜通过电晕处理后，用涂布设备涂布聚胺脂底胶并烘干，涂布速度为190-290米/分钟，烘干温度为80-180℃，烘干方式采用热风烘干或远红外加热烘干，或者是同时采用远红外和热风烘干两种方式，涂布量为0.4-0.6g/m2；
(8)用涂布设备在聚胺脂底胶面涂布上述制得的超高水汽阻隔聚丙烯乳胶后烘干，涂布速度为190-290米/分钟，烘干温度为80-180℃，烘干方式采用热风烘干或远红外加热烘干，或者是同时采用远红外和热风烘干两种方式，涂布量为2.0-3.0g/m2；
(9)将上述涂布好的薄膜固化30-80小时，固化温度40-90℃，即制得本发明的食品级防锈聚丙烯双向拉伸薄膜。
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CN101863173A (zh) * 2010-06-16 2010-10-20 海南赛诺实业有限公司 一种印刷用改性聚乙烯醇涂布薄膜及其制造方法
CN102248729A (zh) * 2011-05-04 2011-11-23 海南赛诺实业有限公司 一种热封型聚偏二氯乙烯涂布薄膜及其制造方法
CN102275362A (zh) * 2011-05-04 2011-12-14 海南赛诺实业有限公司 一种水汽阻隔型聚偏二氯乙烯涂布薄膜及其制造方法

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Publication number Priority date Publication date Assignee Title
CN101863173A (zh) * 2010-06-16 2010-10-20 海南赛诺实业有限公司 一种印刷用改性聚乙烯醇涂布薄膜及其制造方法
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