CN113400754A - 一种具有干燥吸氧指示功能的复合膜及其制备方法 - Google Patents

一种具有干燥吸氧指示功能的复合膜及其制备方法 Download PDF

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CN113400754A
CN113400754A CN202110582878.0A CN202110582878A CN113400754A CN 113400754 A CN113400754 A CN 113400754A CN 202110582878 A CN202110582878 A CN 202110582878A CN 113400754 A CN113400754 A CN 113400754A
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dry oxygen
composite
oxygen absorption
film
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黄湘晖
李全布
王清
黄文娟
王芳颖
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Jiangyin Baobo Packing Co ltd
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Abstract

本发明公开了一种具有干燥吸氧指示功能的复合膜，所述复合膜的膜层结构由外向内依次为PET层或PA层、胶黏剂层、铝箔层、胶黏剂层、PE电晕复合层、PE干燥吸氧指示层、PE热封层；所述PE干燥吸氧指示层按照重量份数计，包括30‑70份的PE树脂、30‑70份的复合干燥吸氧剂。本发明还公开了复合膜的制备方法。本发明的具有干燥吸氧指示功能的复合膜在PE热封层的外侧设置PE干燥吸氧指示层，PE干燥吸氧指示层内添加吸水、吸氧能够显色的复合干燥吸氧剂，复合干燥吸氧剂吸水、吸氧后，包装膜的颜色发生变化，便于监控包装袋内的吸水情况；采用该复合膜包装后，也能够有效阻隔水气，对包装袋内的水气和氧气进行持续吸收，提高包装内容物的干燥程度，延长保质期。

Description

一种具有干燥吸氧指示功能的复合膜及其制备方法
技术领域
本发明涉及药品的包装复合膜技术领域，具体涉及一种具有干燥吸氧指示功能的复合膜及其制备方法。
背景技术
药品包装工业中，为保障药品的安全，延长保质期，需要阻隔外界氧气和水气的侵入。目前，在软包装材料中，阻隔性最好的是铝箔。但是，一部分药品对水极其敏感，单纯的带有阻隔层的包装已不能满足包装需求，对于一些要求高的药品的包装，常常会在其中放入带吸水剂的干燥剂小包装。而单独添加小包装的干燥剂，需要同时投入干燥剂并对干燥剂采用特殊的包装膜进行单独包装，生产成本高；其次，在药品包装过程中，单独包装的干燥剂需要单独的工序另外放入，增加药品包装工作量，且单独包装的干燥剂还带有误食风险；另外，在药品包装中，使用高阻隔材料，可防止由于氧气等气体的渗透而引起的微生物繁殖和内容物氧化，延长药品的保质期。
因此，将带有阻隔功能和吸水、吸氧功能的材料叠加在一起，使包装袋即能吸附包装袋内的水分子，又能够对外界的水气进行阻隔，同时吸附渗透至包装袋内的氧，避免被包装药品氧化，变性，会是一项非常有意义的工作。
发明内容
本发明的目的在于，克服现有技术中存在的缺陷，提供一种能够监控包装袋内的水气、氧气情况，降低包装成本和工序，有效阻隔水气，延长包装内容物保质期的具有干燥吸氧指示功能的复合膜。
为实现上述目的，本发明的技术方案是设计一种具有干燥吸氧指示功能的复合膜，所述复合膜的膜层结构由外向内依次为PET层或PA层、胶黏剂层、铝箔层、胶黏剂层、PE电晕复合层、PE干燥吸氧指示层、PE热封层；所述PE干燥吸氧指示层按照重量份数计，包括30-70份的PE树脂、30-70份的复合干燥吸氧剂。本发明的复合膜通过设置铝箔层并在PE热封层的外侧设置PE干燥吸氧指示层，PE干燥吸氧指示层内添加吸水能够显色的复合干燥吸氧剂，复合干燥吸氧剂吸水后，包装膜的颜色发生变化，便于监控包装袋内的水气、氧气的情况；另外，采用该复合膜对药品进行包装，也能够有效阻隔水气，对外界渗透的水气进行持续吸收，提高包装内容物的干燥程度，延长包装内容物保质期，采用该包装膜替代干燥剂，也能够降低包装成本和简化包装工序。
优选的技术方案为，所述复合干燥吸氧剂包括氧化钙，所述复合干燥吸氧剂的粒径为150-250nm。氧化钙呈白色，在制膜的过程中与PE混合后，氧化钙呈现具有杂质的状态，且通过光线的反射后在复合膜的内层呈现淡黄色，氧化钙吸水后，白度增加，使包装膜的内部表征显示为白色，进一步提高复合膜的吸水效果；且氧化钙吸水效果好，成本低廉，易得，进一步降低复合膜的制作成本。
进一步优选的技术方案为，所述复合干燥吸氧剂还包括纳米还原铁粉。PE干燥吸氧指示层又同时添加纳米还原铁粉，纳米还原铁粉与从外部渗透的氧或被包装在内部的氧进行反应生成铁红色的三氧化二铁，既能够对外部进行阻氧，也能够吸收包装内部的氧，减少药品氧化变性的可能性。
进一步优选的技术方案为，所述PE电晕复合层、PE干燥吸氧指示层和所述PE热封层之间的厚度比为1：(2-4)：1。通过对PE电晕复合层、PE干燥吸氧指示层和PE热封层的厚度进行控制，进一步控制PE干燥吸氧指示层的吸水时间，使复合膜可在长效吸水和短效吸水之间进行选择和调控。
进一步优选的技术方案为，所述PET层或PA层的厚度为10-30um，铝箔层厚度为6-60um，PE电晕复合层的厚度为5-100um。
进一步优选的技术方案为，所述胶黏剂层由聚氨酯类双组分胶水形成。PE电晕复合层、PET层或PA层通过胶黏剂与铝箔层连接，由于铝箔表面有一定的细毛孔，聚氨酯类双组分胶水复合在铝箔表面，胶水填充在铝箔的毛细孔中，不仅提高了铝箔的强度，也提高了铝箔的阻隔性能。
本发明还公开了一种具有干燥吸氧指示功能的复合膜的制备方法，包括以下步骤：
S1：制备复合干燥吸氧剂母粒，首先将权利要求1所述的PE干燥吸氧指示层的的重量份数的氧化钙粉末、纳米还原铁粉、分散剂如EBS(乙撑双硬脂酸酰胺)和PE树脂置于密炼机中均匀混合，造粒，制成复合干燥吸氧剂母粒；
S2：多层共挤吹膜，将PE电晕复合层、PE复合干燥吸氧剂层和PE热封层的原料分别加入挤出机的不同料斗中，180-230℃条件下熔融，塑化，并通过模头挤出；在模头的挤出口多层熔融原料挤出融合，同时对薄膜进行吹胀；
S3：将步骤S2制得的多层PE膜通过胶黏剂层依次与铝箔层、PET层/PA层复合，切边，收卷制得具有干燥吸氧指示功能的复合膜；
S4：对步骤S3制得的复合膜抽真空包装。
本发明的制备方法中，先将氧化钙、纳米还原铁粉与PE混合造粒，制成复合干燥吸氧剂母粒，最后再与其他组分进行共混、挤出成膜，提高了复合干燥吸氧剂在整个PE干燥吸氧指示层内的分散性，进一步提高了复合膜的吸水显色效果。
本发明的优点和有益效果在于：本发明的具有干燥吸氧指示功能的复合膜能够监控包装袋内的水气、氧气的情况，降低包装成本和工序，有效降低包装内的水汽和氧气，延长包装内容物保质期。本发明的复合膜通过设置铝箔层并在PE热封层的外侧设置PE干燥吸氧指示层，PE干燥吸氧指示层内添加吸水能够显色的复合干燥吸氧剂，复合干燥吸氧剂吸水后，包装膜的颜色发生变化，便于监控包装袋内的吸水情况；另外，采用该复合膜对药品进行包装，也能够有效阻隔水气，对外界渗透的水气进行持续吸收，提高包装内容物的干燥程度，延长包装内容物保质期，采用该包装膜替代干燥剂，也能够降低包装成本和简化包装工序；氧化钙呈白色，在制膜的过程中与PE混合后，氧化钙呈现具有杂质的状态，且通过光线的反射后在复合膜的内层呈现淡黄色，氧化钙吸水后，白度增加，使包装膜的内部表征显示为白色，进一步提高复合膜的吸水效果；且氧化钙吸水效果好，成本低廉，易得，进一步降低复合膜的制作成本；PE干燥吸氧指示层又同时添加纳米还原铁粉，纳米还原铁粉与从外部渗透的氧或被包装在内部的氧进行反应生成铁红色的三氧化二铁，既能够对外部进行阻氧，也能够吸收包装内部的氧，减少药品氧化变性的可能性；本发明的制备方法中，先将氧化钙、纳米还原铁粉与PE混合造粒，制成复合干燥吸氧剂母粒，最后再与其他组分进行共混、挤出成膜，提高了复合干燥吸氧剂在PE干燥吸氧指示层内的分散性，进一步提高了复合膜的吸水、吸氧的显色效果。
附图说明
图1是本发明具有干燥吸氧指示功能的复合膜的结构示意图。
图中：1、PET层或PA层；2、胶黏剂层；3、铝箔层；4、胶黏剂层；5、PE电晕复合层；6、PE干燥吸氧指示层；7、PE热封层。
具体实施方式
下面结合附图和实施例，对本发明的具体实施方式作进一步描述。以下实施例仅用于更加清楚地说明本发明的技术方案，而不能以此来限制本发明的保护范围。
实施例1
如图1所示，本发明是一种具有干燥吸氧指示功能的复合膜，所述复合膜的膜层结构由外向内依次为PET层或PA层1、胶黏剂层2、铝箔层3、胶黏剂层4、PE电晕复合层5、PE干燥吸氧指示层6、PE热封层7；所述PE干燥吸氧指示层按照重量份数计，包括50份的PE、50份的氧化钙。
所述PET层或PA层的厚度为20um，铝箔层厚度为30um，PE电晕复合层的厚度为50um，PE干燥吸氧指示层的厚度17um，所述PE热封层之间的厚度为17um。
所述胶黏剂层由聚氨酯类双组分胶水形成，所述聚氨酯类双组分胶水包括主剂与固化剂，所述主剂与固化剂混合质量比为20:1；所述主剂为Dows公司的Adcote 502S胶水，所述固化剂为Catalyst F*固化剂。或所述聚氨酯类双组分胶水包括主剂与固化剂，所述主剂与固化剂混合质量比为50:1；所述主剂为汉高公司的UK 3640胶水，所述固化剂为UK6800固化剂。
一种具有干燥吸氧指示功能的复合膜的制备方法，包括以下步骤：多层共挤吹膜，将PE电晕复合层、PE复合干燥吸氧剂层和PE热封层的原料分别加入挤出机的不同料斗中，180-230℃条件下熔融，塑化，并通过模头挤出；在模头的挤出口多层熔融原料挤出融合，同时对薄膜进行吹胀；将制得的多层共挤吹膜通过胶黏剂层依次与铝箔层、PET层/PA层复合，切边，收卷、抽真空包装，制得具有干燥吸氧指示功能的复合膜。
实施例2
实施例2与实施例1的区别在于，所述PE干燥吸氧指示层按照重量份数计，包括50份的PE、40份的氧化钙。
实施例3
实施例3与实施例2的区别在于，所述PE干燥吸氧指示层按照重量份数计，包括50份的PE、60份的氧化钙
实施例4
实施例4与实施例1的区别在于，所述复合干燥吸氧剂包括25份的氧化钙、25份的纳米还原铁粉。
实施例5
实施例5与实施例4的区别在于，先将氧化钙粉末、纳米还原铁粉与20份的PE粒子均匀混合，造粒，制成复合干燥吸氧剂母粒，接着将PE电晕复合层、PE复合干燥吸氧剂层和PE热封层的原料分别加入挤出机的不同料斗中，180-230℃条件下熔融，塑化，并通过模头挤出；在模头的挤出口多层熔融原料挤出融合，同时对薄膜进行吹胀；获得的多层PE膜通过胶黏剂层依次与铝箔层、PET层/PA层复合，切边，收卷，抽真空包装制得具有干燥吸氧指示功能的复合膜。
实施例6
实施例6与实施例5的区别在于，所述PE干燥吸氧指示层的厚度为12um，所述PE热封层的厚度为12um。
实施例7
实施例7与实施例5的区别在于，所述PE干燥吸氧指示层为25um，所述PE热封层为25um。
对上述各实施例制备的复合膜进行性能检测，检测结果如下：
Figure BDA0003086661710000061
以上所述仅是本发明的优选实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本发明技术原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也应视为本发明的保护范围。

Claims (7)

1.一种具有干燥吸氧指示功能的复合膜，其特征在于，所述复合膜的膜层结构由外向内依次为PET层或PA层、胶黏剂层、铝箔层、胶黏剂层、PE电晕复合层、PE干燥吸氧指示层、PE热封层；所述PE干燥吸氧指示层按照重量份数计，包括30-70份的PE树脂、30-70份的复合干燥吸氧剂。
2.根据权利要求1所述的具有干燥吸氧指示功能的复合膜，其特征在于，所述复合干燥吸氧剂包括氧化钙，所述复合干燥吸氧剂的粒径为150-250nm。
3.根据权利要求2所述的具有干燥吸氧指示功能的复合膜，其特征在于，所述复合干燥吸氧剂还包括纳米还原铁粉。
4.根据权利要求3所述的具有干燥吸氧指示功能的复合膜，其特征在于，所述PE电晕复合层、PE干燥吸氧指示层和所述PE热封层之间的厚度比为1：(2-4)：1。
5.根据权利要求4所述的具有干燥吸氧指示功能的复合膜，其特征在于，所述PET层或PA层的厚度为10-30um，铝箔层厚度为6-60um，PE电晕复合层的厚度为5-100um。
6.根据权利要求5所述的具有干燥吸氧指示功能的复合膜，其特征在于，所述胶黏剂层由聚氨酯类双组分胶水形成。
7.一种根据权利要求6所述的具有干燥吸氧指示功能的复合膜的制备方法，其特征在于，包括以下步骤：
S1：制备复合干燥吸氧剂母粒，首先将权利要求1所述的PE干燥吸氧指示层的的重量份数的氧化钙粉末、纳米还原铁粉、分散剂和PE树脂置于密炼机中均匀混合，造粒，制成复合干燥吸氧剂母粒；
S2：多层共挤吹膜，将PE电晕复合层、PE复合干燥吸氧剂层和PE热封层的原料分别加入挤出机的不同料斗中，180-230℃条件下熔融，塑化，并通过模头挤出；在模头的挤出口多层熔融原料挤出融合，同时对薄膜进行吹胀；
S3：将步骤S2制得的多层PE膜通过胶黏剂层依次与铝箔层、PET层/PA层复合，切边，收卷制得具有干燥吸氧指示功能的复合膜；
S4：对步骤S3制得的复合膜抽真空包装。
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