CN109265798B - 一种拉伸缠绕膜的制备方法 - Google Patents

一种拉伸缠绕膜的制备方法 Download PDF

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CN109265798B
CN109265798B CN201811011656.8A CN201811011656A CN109265798B CN 109265798 B CN109265798 B CN 109265798B CN 201811011656 A CN201811011656 A CN 201811011656A CN 109265798 B CN109265798 B CN 109265798B
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陈建峰
张鑫
史志新
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Anhui Youfa Packaging Technology Co.,Ltd.
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Abstract

本发明涉及一种拉伸缠绕膜的制备方法，属于包装材料技术领域。本发明碳纳米管中碳原子采取SP2杂化，使碳纳米管具有高模量和高强度，碳纳米管具有良好的力学性能，碳纳米管拥有良好的柔韧性，可以拉伸，加入碳纳米管制成的复合材料，可使复合材料表现出良好的强度、弹性、抗疲劳性及各向同性；本发明中将二氧化钛和碳纳米管采用硅溶胶包覆，二氧化钛和碳纳米管能均匀分布，不易团聚，加入包覆材料，硅溶胶是二氧化硅胶体粒子在水中稳定的分散体系，与纳米二氧化钛共同作用，使得包覆材料的化学性质稳定，且硅溶胶具有三维空间网状结构的连续体，具有较大的比表面积，将碳纳米管牢牢吸附，有效的提高了拉伸缠绕膜的拉伸强度。

Description

一种拉伸缠绕膜的制备方法
技术领域
本发明涉及一种拉伸缠绕膜的制备方法，属于包装材料技术领域。
背景技术
包装材料是指用于制造包装容器、包装装潢、包装印刷、包装运输等满足产品包装要求所使用的材料，它即包括金属、塑料、玻璃、陶瓷、纸、竹本、野生蘑类、天然纤维、化学纤维、复合材料等主要包装材料，又包括捆扎带、装潢、印刷材料等辅助材料。
缠绕膜是工业用装膜制品，具有拉伸强度高、延伸率大、自粘性好、透明度高等优点，可用于手工缠绕膜，也可用于机用缠绕膜，可广泛应用于各种货物的集中包装，对堆放在托板上的货物进行缠绕包装，使包装物更加稳固整洁，更超强防水作用，已被广泛使用在外贸出口、造纸、五金、塑料化工、建材、食品医药行业。国内的包装缠绕膜一般是以PVC和DOA为主要材料，借助其回缩性，可以将产品扎成一个单元，防止产品之间相互分离，且具有一定的粘性，被广泛运用于外贸出口、造纸、五金电器、塑胶、化工、建材等方面；但由于其环保问题、强度缺陷等，以PVC和DOA为主的包装缠绕膜已渐渐被取代，因此，对包装缠绕膜的研究成为重点。
氯化聚丙烯(CPP)是一种分子结构中含有C-Cl键的聚丙烯改性产物，常用于涂料与粘结剂中，但由于该物质中仅仅引入氯离子，使得其还存在诸多缺点，如耐冲击力小、耐候性差、与其它树脂相容性差等。目前市场上的拉伸缠绕膜受温度影响粘性，气温高于30℃时相对较粘，低于15℃时粘性稍差，而且拉伸强度、穿刺力等性能需要进一步提高以适应更广泛的市场。因此，对现有技术中拉伸缠绕膜的不足开发出具有新性能的膜是十分必要的。
发明内容
本发明所要解决的技术问题：针对目前市场上的拉伸缠绕膜拉伸强度差的问题，提供了一种拉伸缠绕膜的制备方法。
为解决上述技术问题，本发明采用的技术方案是：
按重量份数计，分别称取10～15份聚四氟乙烯、14～19份聚乙烯、1～8份碳纳米管、5～10份聚乳酸、2～6份己烯共聚聚乙烯、0.1～0.6份抗氧化剂、0.1～0.4份分散剂、2～5份硅溶胶、0.1～0.6份纳米二氧化钛，将聚四氟乙烯、聚乙烯、己烯共聚聚乙烯和聚乳酸混合均匀，保温处理，得共混物，将碳纳米管、硅溶胶和纳米二氧化钛混合均匀，得复合溶胶，将复合溶胶真空干燥处理，得复合凝胶，将共混物、复合凝胶、抗氧化剂和分散剂混合，搅拌处理，得混合物，将混合物注入双螺杆挤出机挤出并纵向拉伸处理，收卷制得拉伸缠绕膜。
所述的保温处理为在温度为70～90℃下保温1～3h。
所述的真空干燥处理为将复合溶胶置于温度为40～50℃、真空度为0.04～0.08mbar条件下真空干燥24～72h。
所述的搅拌处理为在搅拌速度为80～90r/min下搅拌30～60min。
所述的挤出并纵向拉伸处理为在温度为180～215℃下挤出，得铸片，在80～100℃下进行纵向拉伸。
所述的抗氧化剂为抗氧化剂1010、抗氧化剂1076和抗氧化剂CA中的一种。
所述的分散剂为聚乙烯蜡和聚乙二醇中的一种。
本发明与其他方法相比，有益技术效果是：
（1）本发明采用双螺杆挤流延试验机单轴拉伸制备了拉伸缠绕膜，经过定向拉伸，制备的拉伸缠绕膜的拉伸强度、阻隔性能、耐热性能和透明度等得到提高，碳纳米管中碳原子采取SP2杂化，相比SP3杂化，SP2杂化中S轨道成分比较大，使碳纳米管具有高模量和高强度，碳纳米管具有良好的力学性能，CNTs抗拉强度达到50～200GPa，它的弹性模量可达1TPa，碳纳米管拥有良好的柔韧性，可以拉伸，加入碳纳米管制成的复合材料，可使复合材料表现出良好的强度、弹性、抗疲劳性及各向同性；
（2）本发明中将二氧化钛和碳纳米管采用硅溶胶包覆，二氧化钛和碳纳米管能均匀分布，不易团聚，加入包覆材料，硅溶胶是二氧化硅胶体粒子在水中稳定的分散体系，与纳米二氧化钛共同作用，使得包覆材料的化学性质稳定，且硅溶胶具有三维空间网状结构的连续体，具有较大的比表面积，将碳纳米管牢牢吸附，有效的提高了拉伸缠绕膜的拉伸强度。
具体实施方式
按重量份数计，分别称取10～15份聚四氟乙烯、14～19份聚乙烯、1～8份碳纳米管、5～10份聚乳酸、2～6份己烯共聚聚乙烯、0.1～0.6份抗氧化剂、0.1～0.4份分散剂、2～5份硅溶胶、0.1～0.6份纳米二氧化钛，将聚四氟乙烯、聚乙烯、己烯共聚聚乙烯和聚乳酸混合均匀，在温度为70～90℃下保温1～3h，得共混物，将碳纳米管、硅溶胶和纳米二氧化钛混合均匀，得复合溶胶，将复合凝胶置于温度为40～50℃、真空度为0.04～0.08mbar条件下真空干燥24～72h，得复合凝胶，将共混物、复合凝胶、抗氧化剂和分散剂混合，在搅拌速度为80～90r/min下搅拌30～60min，得混合物，将混合物注入双螺杆挤出机，在温度为180～215℃下挤出，得铸片，在80～100℃下进行纵向拉伸，收卷制得拉伸缠绕膜。
按重量份数计，分别称取10份聚四氟乙烯、14份聚乙烯、1份碳纳米管、5份聚乳酸、2份己烯共聚聚乙烯、0.1份抗氧化剂、0.1份分散剂、2份硅溶胶、0.1份纳米二氧化钛，将聚四氟乙烯、聚乙烯、己烯共聚聚乙烯和聚乳酸混合均匀，在温度为70℃下保温1h，得共混物，将碳纳米管、硅溶胶和纳米二氧化钛混合均匀，得复合溶胶，将复合凝胶置于温度为40℃、真空度为0.04mbar条件下真空干燥24h，得复合凝胶，将共混物、复合凝胶、抗氧化剂和分散剂混合，在搅拌速度为80r/min下搅拌30min，得混合物，将混合物注入双螺杆挤出机，在温度为180℃下挤出，得铸片，在80℃下进行纵向拉伸，收卷制得拉伸缠绕膜。
按重量份数计，分别称取13份聚四氟乙烯、16份聚乙烯、5份碳纳米管、7份聚乳酸、4份己烯共聚聚乙烯、0.4份抗氧化剂、0.3份分散剂、4份硅溶胶、0.4份纳米二氧化钛，将聚四氟乙烯、聚乙烯、己烯共聚聚乙烯和聚乳酸混合均匀，在温度为80℃下保温2h，得共混物，将碳纳米管、硅溶胶和纳米二氧化钛混合均匀，得复合溶胶，将复合凝胶置于温度为45℃、真空度为0.06mbar条件下真空干燥48h，得复合凝胶，将共混物、复合凝胶、抗氧化剂和分散剂混合，在搅拌速度为85r/min下搅拌45min，得混合物，将混合物注入双螺杆挤出机，在温度为197℃下挤出，得铸片，在90℃下进行纵向拉伸，收卷制得拉伸缠绕膜。
按重量份数计，分别称取15份聚四氟乙烯、19份聚乙烯、18份碳纳米管、10份聚乳酸、6份己烯共聚聚乙烯、0.6份抗氧化剂、0.4份分散剂、5份硅溶胶、0.6份纳米二氧化钛，将聚四氟乙烯、聚乙烯、己烯共聚聚乙烯和聚乳酸混合均匀，在温度为90℃下保温3h，得共混物，将碳纳米管、硅溶胶和纳米二氧化钛混合均匀，得复合溶胶，将复合凝胶置于温度为50℃、真空度为0.08mbar条件下真空干燥72h，得复合凝胶，将共混物、复合凝胶、抗氧化剂和分散剂混合，在搅拌速度为90r/min下搅拌60min，得混合物，将混合物注入双螺杆挤出机，在温度为215℃下挤出，得铸片，在100℃下进行纵向拉伸，收卷制得拉伸缠绕膜。
将本发明制备的拉伸缠绕膜及市售的拉伸缠绕膜进行检测，具体检测结果如下表表1：
表1拉伸缠绕膜性能表征
Figure DEST_PATH_IMAGE001
由表1可知本发明制备的拉伸缠绕膜，拉伸强度好，力学性能优异，解决了市场所售拉伸缠绕膜拉伸强度差的问题。具有广阔的市场价值和应用前景。

Claims (7)

1.一种拉伸缠绕膜的制备方法，其特征在于具体步骤为：
按重量份数计，分别称取10～15份聚四氟乙烯、14～19份聚乙烯、1～8份碳纳米管、5～10份聚乳酸、2～6份己烯共聚聚乙烯、0.1～0.6份抗氧化剂、0.1～0.4份分散剂、2～5份硅溶胶、0.1～0.6份纳米二氧化钛，将聚四氟乙烯、聚乙烯、己烯共聚聚乙烯和聚乳酸混合均匀，保温处理，得共混物，将碳纳米管、硅溶胶和纳米二氧化钛混合均匀，得复合溶胶，将复合溶胶真空干燥处理，得复合凝胶，将共混物、复合凝胶、抗氧化剂和分散剂混合，搅拌处理，得混合物，将混合物注入双螺杆挤出机挤出并纵向拉伸处理，收卷制得拉伸缠绕膜。
2.根据权利要求1所述的一种拉伸缠绕膜的制备方法，其特征在于所述的保温处理为在温度为70～90℃下保温1～3h。
3.根据权利要求1所述的一种拉伸缠绕膜的制备方法，其特征在于所述的真空干燥处理为将复合溶胶置于温度为40～50℃、真空度为0.04～0.08mbar条件下真空干燥24～72h。
4.根据权利要求1所述的一种拉伸缠绕膜的制备方法，其特征在于所述的搅拌处理为在搅拌速度为80～90r/min下搅拌30～60min。
5.根据权利要求1所述的一种拉伸缠绕膜的制备方法，其特征在于所述的挤出并纵向拉伸处理为在温度为180～215℃下挤出，得铸片，在80～100℃下进行纵向拉伸。
6.根据权利要求1所述的一种拉伸缠绕膜的制备方法，其特征在于所述的抗氧化剂为抗氧化剂1010、抗氧化剂1076和抗氧化剂CA中的一种。
7.根据权利要求1所述的一种拉伸缠绕膜的制备方法，其特征在于所述的分散剂为聚乙烯蜡和聚乙二醇中的一种。
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