CN114771063A - 一种双面热封消光膜及其制备方法 - Google Patents
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Abstract
本发明公开了一种双面热封消光膜,依次由上表层、芯层和下表层构成;所述上表层由下述质量份的原料制成:聚丙烯44‑50份、高密度聚乙烯35‑40份、乙烯‑1‑辛烯共聚物25‑30份、消光粉5‑8份、镧掺杂纳米二氧化硅1‑3份。本发明还公开了双面热封消光膜的制备方法。本发明的双面热封消光膜兼备优良消光性能及热封性能,在食品包装领域具有良好的应用前景。
Description
技术领域
本发明涉及薄膜技术领域,尤其涉及一种双面热封消光膜及其制备方法。
背景技术
热封膜是指热封用的塑料薄膜,其中双面热封膜主要用于食品的外包装,主要包括速冻食品包装、蒸煮食品包装、快餐食品包装以及零食饮料包装等。而随着人们审美观的不断提高,普通的光膜包装已经无法吸引顾客的眼球,低光泽度高雾度成漫反射消光效果的包装膜越来越受到人们青睐,因此,开发出一种双面热封消光膜是具有广阔前景的。热封膜必须具备以下几个重要性能:热封起始温度低、耐寒耐热性好、热封强度高以及良好的夹杂物热封性,目前市面上的热封膜很难做到兼顾以上优点。而要在此基础上使薄膜具有消光性,不但要考虑其厚度波动大,热封层不均匀导致封口平整度差的问题,还要考虑到消光面热封效果是否优良,消光效果是否均匀的问题。因此,有必要开发一种兼备优良消光性能及热封性能的双面热封消光膜。
发明内容
基于背景技术存在的技术问题,本发明提出了一种双面热封消光膜及其制备方法。
本发明提出的一种双面热封消光膜,依次由上表层、芯层和下表层构成;所述上表层由下述质量份的原料制成:聚丙烯44-50份、高密度聚乙烯35-40份、乙烯-1-辛烯共聚物25-30份、消光粉5-8份、镧掺杂纳米二氧化硅1-3份;
所述芯层由下述质量百分比的原料制成:聚丙烯95-98.5份、抗静电剂1-3份、爽滑剂0.5-2份;
所述下表层由下述质量份的原料制成:热封料96-98份、抗粘连剂2-4份。
优选地,所述镧掺杂纳米二氧化硅的制备方法为:将纳米二氧化硅加入硝酸镧的水溶液中分散均匀,然后加入氨水将pH调至9-11,离心后收集沉淀,清洗、干燥,即得;优选地,所述纳米二氧化硅与硝酸镧的质量比为1:(0.03-0.1)。
优选地,所述聚丙烯在190℃、2.16kg下的熔融指数为6-9g/10min,所述高密度聚乙烯的密度为0.941-0.960g/cm3,在190℃、2.16kg下的熔融指数为0.2-0.5g/10min。
优选地,所述消光粉为粒径为4-6μm的二氧化硅。
优选地,所述热封料的型号为F5005B。
优选地,所述抗静电剂为乙氧化胺抗静电剂,所述爽滑剂为油酸酰胺、芥酸酰胺、硅酮中的至少一种,所述抗粘连剂为粒径为1-6μm的球形二氧化硅。
一种所述的双面热封消光膜的制备方法,包括下述步骤:
将上表层、芯层和下表层的原料分别加入挤出机中,共挤出复合形成铸片,所述铸片依次经过冷却、加热、纵向拉伸、横向拉伸、收卷、电晕处理、时效处理,得到双面热封消光膜。
优选地,所述共挤出复合包括:将芯层的原料加入双螺杆挤出机,在220-260℃下熔融,将上表层的原料加入单螺杆挤出机,在210-245℃下熔融,将下表层的原料加入另一台单螺杆挤出机,在210-240℃下熔融,然后分别将熔融后上表层、芯层和下表层的原料通过对应的连接管从模头共同挤出形成铸片,模头温度为240-250℃;
优选地,所述铸片的厚度为1-2mm。
优选地,所述纵向拉伸包括预热、拉伸、定型工序,其中预热温度为115-125℃,拉伸温度为105-122℃,拉伸倍率为4.7-5.0倍,定型温度为120-130℃。
优选地,所述横向拉伸包括预热、拉伸、定型、冷却工序,其中预热温度为169-174℃,拉伸温度为150-160℃,拉伸倍率为8.5-9.5倍,定型温度为163-168℃,冷却区温度为室温冷却。
本发明的有益效果如下:
本发明的薄膜为三层结构,其下表层为热封层,上表层通过对配方的优化,使其兼具良好的消光与热封性,从而达到双面热封以及消光的使用效果。在上表层的原料中,通过合适配比的聚丙烯与高密度聚乙烯复混、消光粉的适量添加以及具有低温热封性的乙烯-1-辛烯共聚物的混合作为原料,可以在保证膜层消光效果的前提下,具有优良的热封性;但是,由于多种不同的聚合物混配,使膜层的平整度和消光均匀性下降;为此,本发明还引入了适量的添加剂镧掺杂纳米二氧化硅,诱导聚合物结晶的细化,使膜层的表面结构趋于均匀化,从而使膜层的消光均匀性和膜层平整度达到要求。本发明制备的双面热封消光膜厚度均匀性好,热封层更均匀,热封平整度好,其不仅消光效果均匀,而且具有优良的热封性能,在食品包装领域具有良好的应用前景。
具体实施方式
下面,通过具体实施例对本发明的技术方案进行详细说明。
下述实施例中,聚丙烯在190℃、2.16kg下的熔融指数为8g/10min;高密度聚乙烯的密度为0.949g/cm3,在190℃、2.16kg下的熔融指数为0.25g/10min;乙烯-1-辛烯共聚物的型号为LG化学POE LC180;热封料的型号为燕山石化F5005B;消光粉为粒径为4-6μm的二氧化硅;抗粘连剂为粒径为1-6μm的球形二氧化硅;抗静电剂的型号为英国禾大ATMER 163;爽滑剂为硅酮。
实施例1
一种双面热封消光膜,依次由上表层、芯层和下表层构成;
上表层由下述质量份的原料制成:聚丙烯44份、高密度聚乙烯35份、乙烯-1-辛烯共聚物25份、消光粉5份、镧掺杂纳米二氧化硅1份;其中镧掺杂纳米二氧化硅的制备方法为:按质量份计,将0.03份硝酸镧加入100份水中得到硝酸镧的水溶液,然后加入1份纳米二氧化硅超声分散均匀,再加入氨水将pH调至9,离心后收集沉淀,清洗、干燥,即得;
芯层由下述质量百分比的原料制成:聚丙烯95份、抗静电剂1份、爽滑剂0.5份;
下表层由下述质量份的原料制成:热封料96份、抗粘连剂2份。
上述双面热封消光膜的制备方法包括下述步骤:
将芯层的原料加入双螺杆挤出机,在220-260℃下熔融,将上表层的原料加入单螺杆挤出机,在210-245℃下熔融,将下表层的原料加入另一台单螺杆挤出机,在210-240℃下熔融,然后分别将熔融后上表层、芯层和下表层的原料通过对应的连接管从模头共同挤出形成厚度为1mm的铸片,模头温度为240-250℃;
将铸片依次经过冷却、加热、纵向拉伸、横向拉伸、收卷、电晕处理、时效处理,得到双面热封消光膜,其中纵向拉伸包括预热、拉伸、定型工序,其中预热温度为115℃,拉伸温度为105℃,拉伸倍率为4.7倍,定型温度为120℃;横向拉伸包括预热、拉伸、定型、冷却工序,其中预热温度为169℃,拉伸温度为150℃,拉伸倍率为8.5倍,定型温度为163℃,冷却区温度为室温冷却。
实施例2
一种双面热封消光膜,依次由上表层、芯层和下表层构成;
上表层由下述质量份的原料制成:聚丙烯50份、高密度聚乙烯40份、乙烯-1-辛烯共聚物30份、消光粉8份、镧掺杂纳米二氧化硅3份;其中镧掺杂纳米二氧化硅的制备方法为:按质量份计,将0.1份硝酸镧加入100份水中得到硝酸镧的水溶液,然后加入1份纳米二氧化硅超声分散均匀,再加入氨水将pH调至11,离心后收集沉淀,清洗、干燥,即得;
芯层由下述质量百分比的原料制成:聚丙烯98.5份、抗静电剂3份、爽滑剂2份;
下表层由下述质量份的原料制成:热封料98份、抗粘连剂4份。
上述双面热封消光膜的制备方法包括下述步骤:
将芯层的原料加入双螺杆挤出机,在220-260℃下熔融,将上表层的原料加入单螺杆挤出机,在210-245℃下熔融,将下表层的原料加入另一台单螺杆挤出机,在210-240℃下熔融,然后分别将熔融后上表层、芯层和下表层的原料通过对应的连接管从模头共同挤出形成厚度为2mm的铸片,模头温度为240-250℃;
将铸片依次经过冷却、加热、纵向拉伸、横向拉伸、收卷、电晕处理、时效处理,得到双面热封消光膜,其中纵向拉伸包括预热、拉伸、定型工序,其中预热温度为125℃,拉伸温度为122℃,拉伸倍率为5.0倍,定型温度为130℃;横向拉伸包括预热、拉伸、定型、冷却工序,其中预热温度为174℃,拉伸温度为160℃,拉伸倍率为9.5倍,定型温度为168℃,冷却区温度为室温冷却。
实施例3
一种双面热封消光膜,依次由上表层、芯层和下表层构成;
上表层由下述质量份的原料制成:聚丙烯45份、高密度聚乙烯37份、乙烯-1-辛烯共聚物28份、消光粉6份、镧掺杂纳米二氧化硅2份;其中镧掺杂纳米二氧化硅的制备方法为:按质量份计,将0.05份硝酸镧加入100份水中得到硝酸镧的水溶液,然后加入1份纳米二氧化硅超声分散均匀,再加入氨水将pH调至10,离心后收集沉淀,清洗、干燥,即得;
芯层由下述质量百分比的原料制成:聚丙烯96.5份、抗静电剂2份、爽滑剂1.5份;
下表层由下述质量份的原料制成:热封料97份、抗粘连剂3份。
上述双面热封消光膜的制备方法包括下述步骤:
将芯层的原料加入双螺杆挤出机,在220-260℃下熔融,将上表层的原料加入单螺杆挤出机,在210-245℃下熔融,将下表层的原料加入另一台单螺杆挤出机,在210-240℃下熔融,然后分别将熔融后上表层、芯层和下表层的原料通过对应的连接管从模头共同挤出形成厚度为1.5mm的铸片,模头温度为240-250℃;
将铸片依次经过冷却、加热、纵向拉伸、横向拉伸、收卷、电晕处理、时效处理,得到双面热封消光膜,其中纵向拉伸包括预热、拉伸、定型工序,其中预热温度为120℃,拉伸温度为110℃,拉伸倍率为4.8倍,定型温度为125℃;横向拉伸包括预热、拉伸、定型、冷却工序,其中预热温度为170℃,拉伸温度为155℃,拉伸倍率为9倍,定型温度为165℃,冷却区温度为室温冷却。
参照GB/T 10003-2008对实施例1-3的双面热封消光膜进行性能检测。检测结果显示,实施例1-3的双面热封消光膜起始热封温度≤115℃,雾度≥80%,兼备优良的消光性能及热封性能。
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 (10)
1.一种双面热封消光膜,其特征在于,依次由上表层、芯层和下表层构成;所述上表层由下述质量份的原料制成:聚丙烯44-50份、高密度聚乙烯35-40份、乙烯-1-辛烯共聚物25-30份、消光粉5-8份、镧掺杂纳米二氧化硅1-3份;
所述芯层由下述质量百分比的原料制成:聚丙烯95-98.5份、抗静电剂1-3份、爽滑剂0.5-2份;
所述下表层由下述质量份的原料制成:热封料96-98份、抗粘连剂2-4份。
2.根据权利要求1所述的双面热封消光膜,其特征在于,所述镧掺杂纳米二氧化硅的制备方法为:将纳米二氧化硅加入硝酸镧的水溶液中分散均匀,然后加入氨水将pH调至9-11,离心后收集沉淀,清洗、干燥,即得;优选地,所述纳米二氧化硅与硝酸镧的质量比为1:(0.03-0.1)。
3.根据权利要求1所述的双面热封消光膜,其特征在于,所述聚丙烯在190℃、2.16kg下的熔融指数为6-9g/10min,所述高密度聚乙烯的密度为0.941-0.960g/cm3,在190℃、2.16kg下的熔融指数为0.2-0.5g/10min。
4.根据权利要求1所述的双面热封消光膜,其特征在于,所述消光粉为粒径为4-6μm的二氧化硅。
5.根据权利要求1所述的双面热封消光膜,其特征在于,所述热封料的型号为F5005B。
6.根据权利要求1所述的双面热封消光膜,其特征在于,所述抗静电剂为乙氧化胺抗静电剂,所述爽滑剂为油酸酰胺、芥酸酰胺、硅酮中的至少一种,所述抗粘连剂为粒径为1-6μm的球形二氧化硅。
7.一种如权利要求1-6任一项所述的双面热封消光膜的制备方法,其特征在于,包括下述步骤:
将上表层、芯层和下表层的原料分别加入挤出机中,共挤出复合形成铸片,所述铸片依次经过冷却、加热、纵向拉伸、横向拉伸、收卷、电晕处理、时效处理,得到双面热封消光膜。
8.根据权利要求7所述的双面热封消光膜的制备方法,其特征在于,所述共挤出复合包括:将芯层的原料加入双螺杆挤出机,在220-260℃下熔融,将上表层的原料加入单螺杆挤出机,在210-245℃下熔融,将下表层的原料加入另一台单螺杆挤出机,在210-240℃下熔融,然后分别将熔融后上表层、芯层和下表层的原料通过对应的连接管从模头共同挤出形成铸片,模头温度为240-250℃;
优选地,所述铸片的厚度为1-2mm。
9.根据权利要求7所述的双面热封消光膜的制备方法,其特征在于,所述纵向拉伸包括预热、拉伸、定型工序,其中预热温度为115-125℃,拉伸温度为105-122℃,拉伸倍率为4.7-5.0倍,定型温度为120-130℃。
10.根据权利要求7所述的双面热封消光膜的制备方法,其特征在于,所述横向拉伸包括预热、拉伸、定型、冷却工序,其中预热温度为169-174℃,拉伸温度为150-160℃,拉伸倍率为8.5-9.5倍,定型温度为163-168℃,冷却区温度为室温冷却。
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