CN106827747A - 一种未拉伸微发泡聚丙烯薄膜 - Google Patents
一种未拉伸微发泡聚丙烯薄膜 Download PDFInfo
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Abstract
本发明属于包装用塑料薄膜技术领域，具体涉及一种未拉伸微发泡聚丙烯薄膜，由电晕层、微发泡层、热封层三层结构制成。本发明无需添加珠光母料而具有珠光效果，且透明度好，热封性能强，生产工艺简单，生产成本低。
Description
技术领域
本发明属于包装用塑料薄膜技术领域，具体涉及一种未拉伸微发泡聚丙烯薄膜。
背景技术
珠光薄膜因具有绚丽多彩的珍珠光泽，而显现出良好的视觉效果及优秀的装饰性，广泛用作商品包装材料及制作商品标签、标识等。其在制造工艺方面是以聚丙烯树脂为主要原料，添加适量的碳酸钙和珠光颜料进行共混、共挤、拉伸形成的内部带有微孔的定向薄膜，即OPP珠光膜，但这种薄膜也存在一定的应用局限性，一方面是热封性能差，因拉伸取向薄膜存在解取向作用而导致热封起皱等不良现象；另一方面是透明度差，以碳酸钙作气泡核，对薄膜的透明度、撕裂强度存在较大的影响。
发明内容
本发明的目的是针对现有的问题，提供了一种未拉伸微发泡聚丙烯薄膜。
本发明是通过以下技术方案实现的：
一种未拉伸聚丙烯气泡薄膜，由电晕层、微发泡层、热封层三层结构制成，所述电晕层由聚丙烯制成；所述微发泡层由65wt%-75wt%的等规均聚聚丙烯、10wt%-25wt%的发泡母料、0wt%-15wt%的聚烯烃弹性体三者的共混物制成；所述热封层由95wt%-98wt%的二元共聚聚丙烯、2wt%-5wt%的防粘剂二者的共混物制成。
进一步的，所述防粘剂按重量份计由以下成分制成：滑石粉46、电气石粉0.5、硅藻土4、绢云母粉1.2；其制备方法为：将滑石粉与绢云母粉在325℃下共混煅烧22min，然后冷却至88℃，添加硅藻土与电气石粉，混合均匀后，得到混合物料，向混合物料中添加其质量2倍的乙二醇和硅藻土质量4.5%的马来酸，搅拌均匀后，进行研磨2小时，然后过滤，清水洗涤，烘干，即得；采用普通滑石粉作为防粘剂，由于其雾度比较高，在高透明的领域使用受到限制，本发明通过采用滑石粉与硅藻土、电气石粉、绢云母粉协同配合作用，能够降低滑石粉的雾度，极大的提高了抗粘连性，并且光泽度没有降低，对机械的磨损性大大降低，可降低88%以上，同时还兼具填充剂和防粘剂双重功效，对气泡薄膜热封性能和尺寸稳定性具有明显的加强。
进一步的，所述的未拉伸聚丙烯气泡薄膜总的厚度为40-150μm。
进一步的，所述的未拉伸聚丙烯气泡薄膜总的厚度为60-120μm。
进一步的，所述的三层结构，电晕层占总厚度的5-20%，微发泡层占总厚度的60-90%，热封层占总厚度的5-20%。
进一步的，所述的发泡母料按重量份计由以下成分制成：偶氮二甲酰胺42、碳酸氢钠8、硬脂酸12、EVA树脂14、CPE树脂16、二氧化钛5、十二烷基苯磺酸钠2。
进一步的，所述的发泡母料使用最佳工艺参数条件为：注射温度为138℃、注射压力为22MPa、注射速度为18mm/s、保压压力为55MPa、保压时间为25s。
进一步的，所述电晕层由无规共聚聚丙烯或等规均聚聚丙烯制成。
进一步的，所述未拉伸微发泡聚丙烯薄膜的制备方法，包括：将三层结构原料分别由三台挤出机熔融挤出，经T形模头分配器挤出至流延骤冷辊，铸片成形，再经厚度控制、电晕处理、收卷、时效处理、分切工序，最终得到成品未拉伸微发泡聚丙烯薄膜。
本发明相比现有技术具有以下优点：本发明无需添加珠光母料而具有珠光效果，且透明度好，热封性能强，生产工艺简单，生产成本低；本发明制备的未拉伸微发泡聚丙烯薄膜具有珠光效果，通过薄膜中间层的微泡结构，能够借助光的折射产生珠光效果，因而无需添加珠光母料，并且具有优秀的热封性能。由于三层共挤流延未拉伸工艺协同配合本发明配制的防粘剂的作用，获得的薄膜尺寸稳定性好、热封强度高，具有良好的柔韧性，且具有良好的透明度、阻隔性能，由于微泡结构的存大，大大改良的聚丙烯的刚性，提升了抗冲击强度。
附图说明
图1为一种未拉伸微发泡聚丙烯薄膜截面结构示意图。
具体实施方式
实施例1
如图1所示，所述未拉伸微发泡聚丙烯薄膜，电晕层1原料为100wt%的无规共聚聚丙烯，厚度为16μm；微发泡层2原料为70wt%的等规均聚聚丙烯、10wt%的聚烯烃弹性体与20wt%发泡母料共混物，厚度为48μm；热封层3原料为97wt%二元共聚丙烯与3wt%的防粘剂共混物，厚度为16μm。将三层原料分别由三台挤出机熔融挤出，经T形模头分配器挤出至流延骤冷辊，铸片成形，再经厚度控制、电晕处理、收卷、时效处理、分切工序，最终得到成品未拉伸微发泡聚丙烯薄膜，薄膜总厚度为80μm；所述的发泡母料按重量份计由以下成分制成：偶氮二甲酰胺42、碳酸氢钠8、硬脂酸12、EVA树脂14、CPE树脂16、二氧化钛5、十二烷基苯磺酸钠2，所述的发泡母料使用最佳工艺参数条件为：注射温度为138℃、注射压力为22MPa、注射速度为18mm/s、保压压力为55MPa、保压时间为25s。
实施例2
如图1所示，所述未拉伸微发泡聚丙烯薄膜，电晕层1原料为100wt%的等规均聚聚丙烯，厚度为15μm；微发泡层2原料为67wt%的等规均聚聚丙烯、10wt%的聚烯烃弹性体与23wt%发泡母料共混物，厚度为70μm；热封层3原料为95wt%二元共聚丙烯与3wt%的防粘剂共混物，厚度为15μm。将三层原料分别由三台挤出机熔融挤出，经T形模头分配器挤出至流延骤冷辊，铸片成形，再经厚度控制、电晕处理、收卷、时效处理、分切工序，最终得到成品未拉伸微发泡聚丙烯薄膜，薄膜总厚度为100μm；所述的发泡母料按重量份计由以下成分制成：偶氮二甲酰胺42、碳酸氢钠8、硬脂酸12、EVA树脂14、CPE树脂16、二氧化钛5、十二烷基苯磺酸钠2，所述的发泡母料使用最佳工艺参数条件为：注射温度为138℃、注射压力为22MPa、注射速度为18mm/s、保压压力为55MPa、保压时间为25s。
对实施例与对比例进行性能对比（对比例1为普通聚丙烯薄膜，膜厚100μm）：
表1
由表1可以看出，本发明制备的未拉伸微发泡聚丙烯薄膜性能更加优越。
本发明采用三层共挤流延未拉伸工艺，不需要添加珠光母料而具有珠光效果，且具有良好的透明度、热封性能和阻隔性能。
经测试，本发明制备的未拉伸微发泡聚丙烯薄膜相较于同等厚度的普通聚丙烯薄膜在相同测试环境下的抗冲击强度提高了1.8倍以上。
Claims (9)
1.一种未拉伸聚丙烯气泡薄膜，其特征在于，由电晕层、微发泡层、热封层三层结构制成，所述电晕层由聚丙烯制成；所述微发泡层由65wt%-75wt%的等规均聚聚丙烯、10wt%-25wt%的发泡母料、0wt%-15wt%的聚烯烃弹性体三者的共混物制成；所述热封层由95wt%-98wt%的二元共聚丙烯、2wt%-5wt%的防粘剂二者的共混物制成。
2.根据权利要求1所述的一种未拉伸微发泡聚丙烯薄膜，其特征在于，所述防粘剂按重量份计由以下成分制成：滑石粉46、电气石粉0.5、硅藻土4、绢云母粉1.2；其制备方法为：将滑石粉与绢云母粉在325℃下共混煅烧22min，然后冷却至88℃，添加硅藻土与电气石粉，混合均匀后，得到混合物料，向混合物料中添加其质量2倍的乙二醇和硅藻土质量4.5%的马来酸，搅拌均匀后，进行研磨2小时，然后过滤，清水洗涤，烘干，即得。
3.根据权利要求1所述的一种未拉伸微发泡聚丙烯薄膜，其特征在于，所述的未拉伸聚丙烯气泡薄膜总的厚度为40-150μm。
4.根据权利要求3所述的一种未拉伸微发泡聚丙烯薄膜，其特征在于，所述的未拉伸聚丙烯气泡薄膜总的厚度为60-120μm。
5.根据权利要求4所述的一种未拉伸微发泡聚丙烯薄膜，其特征在于，所述的三层结构，电晕层占总厚度的5-20%，微发泡层占总厚度的60-90%，热封层占总厚度的5-20%。
6.根据权利要求1所述的一种未拉伸微发泡聚丙烯薄膜，其特征在于，所述的发泡母料按重量份计由以下成分制成：偶氮二甲酰胺42、碳酸氢钠8、硬脂酸12、EVA树脂14、CPE树脂16、二氧化钛5、十二烷基苯磺酸钠2。
7.根据权利要求6所述的一种未拉伸微发泡聚丙烯薄膜，其特征在于，所述的发泡母料使用最佳工艺参数条件为：注射温度为138℃、注射压力为22MPa、注射速度为18mm/s、保压压力为55MPa、保压时间为25s。
8.根据权利要求1所述的一种未拉伸微发泡聚丙烯薄膜，其特征在于，所述电晕层由无规共聚聚丙烯或等规均聚聚丙烯制成。
9.根据权利要求1所述的一种未拉伸微发泡聚丙烯薄膜，其特征在于，所述未拉伸微发泡聚丙烯薄膜的制备方法，包括：将三层结构原料分别由三台挤出机熔融挤出，经T形模头分配器挤出至流延骤冷辊，铸片成形，再经厚度控制、电晕处理、收卷、时效处理、分切工序，最终得到成品未拉伸微发泡聚丙烯薄膜。
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