CN111590988B - 高温蒸煮袋用ny/rcpp复合膜的加工方法 - Google Patents

高温蒸煮袋用ny/rcpp复合膜的加工方法 Download PDF

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CN111590988B
CN111590988B CN202010378396.9A CN202010378396A CN111590988B CN 111590988 B CN111590988 B CN 111590988B CN 202010378396 A CN202010378396 A CN 202010378396A CN 111590988 B CN111590988 B CN 111590988B
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茆贵云
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Hefei Foside New Material Technology Co ltd
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Abstract

本发明公开了一种高温蒸煮袋用NY/RCPP复合膜的加工方法，涉及复合膜技术领域，本发明以尼龙和嵌段共聚聚丙烯作为主料，通过添加加工助剂制得两层结构的NY/RCPP复合膜，所制复合膜兼具NY和RCPP的优点，并通过加工助剂的添加进一步优化所制复合膜的使用性能，所制复合膜无毒无害，具有优良的机械性能、阻隔性能和耐热性能，适用于作为高温蒸煮袋加工材料。

Description

高温蒸煮袋用NY/RCPP复合膜的加工方法
技术领域：
本发明涉及复合膜技术领域，具体涉及一种高温蒸煮袋用NY/RCPP复合膜的加工方法。
背景技术：
高温蒸煮袋是一种能进行加热处理的复合塑料薄膜袋，具有罐头容器和耐沸水塑料袋两者的优点。食品可在高温蒸煮袋内原封不动，经过高温(一般在120～135℃)杀菌加热，取出便可食用。经过多年的使用证明，它是一种理想的销售包装容器，适合肉类、豆制品的包装，方便、卫生又实用，并能很好的保持食品原有的风味，较为消费者青睐。
早期的高温蒸煮袋采用铝塑复合膜，一般为三层，典型结构是表层/胶黏剂/铝箔/胶黏剂/热封层，具有高阻隔性能、耐高温蒸煮性能，并且质轻柔软，因而被广泛用于各种食品的包装。后来，铝箔复合膜包装食品因不透明而使消费者看不到内装物的色和形而不利于消费者购买，并且铝塑复合包装不能用微波加热，与塑料薄膜相比价格较贵。因此人们希望可以采用一种阻隔性与铝塑复合膜相似，但既全透明，又能耐高温蒸煮的包装材料来替代铝塑复合膜。
发明内容：
本发明所要解决的技术问题在于提供一种高温蒸煮袋用NY/RCPP复合膜的加工方法，利用工艺简要和操作简便的加工方法制得两层结构的NY/RCPP复合膜，所制复合膜兼具NY和RCPP的优点，并通过加工助剂的添加进一步优化所制复合膜的使用性能，使所制复合膜适用于作为高温蒸煮袋加工材料。
本发明所要解决的技术问题采用以下的技术方案来实现：
高温蒸煮袋用NY/RCPP复合膜的加工方法，包括以下加工工序：
(1)称取尼龙、聚(甲基乙烯基醚/马来酸)共聚物和防粘连剂，混合均匀，得到NY层混合料；
(2)称取蒸煮级氯化聚丙烯、ε-己内酯/聚醚/环氧丙烷三元共聚物和防粘连剂，混合均匀，得到RCPP层混合料；
(3)分别将NY层混合料和RCPP层混合料送入各自的螺杆挤出机中，熔融塑化，得到NY层熔体和RCPP层熔体；熔体经过滤器过滤后由计量泵送至模头处汇合，流延冷却成型，最后按客户要求收卷、分切成对应规格的成品膜卷。
所述尼龙、聚(甲基乙烯基醚/马来酸)共聚物、防粘连剂的质量比为100:(3-12):(1-5)。
所述尼龙选自尼龙6、尼龙12、尼龙66中的一种或几种。
所述蒸煮级氯化聚丙烯、ε-己内酯/聚醚/环氧丙烷三元共聚物、防粘连剂的质量比为100:(5-20):(1-5)。
所述防粘连剂为芥酸酰胺、硬脂酰胺、硬脂酸钙、硬脂酸锌、聚乙烯蜡、聚丙烯蜡中的一种或几种。
所述挤出机温度为130-250℃，模头温度为130-250℃。
所述冷却时冷却辊的温度为20-30℃。
本发明通过在NY层中添加聚(甲基乙烯基醚/马来酸)共聚物来保证NY层与RCPP层的复合效果，利用聚(甲基乙烯基醚/马来酸)共聚物的胶粘性来促使NY层与RCPP层接触面的牢固粘合，解决了额外使用胶粘剂来复合NY层与RCPP层所增加的涂胶工序和胶粘剂投入成本以及常规溶剂型胶粘剂所存在的使用安全隐患的问题，同时聚(甲基乙烯基醚/马来酸)共聚物的添加还能提高复合膜的机械性能。
本发明通过在RCPP层中添加ε-己内酯/聚醚/环氧丙烷三元共聚物来优化复合膜的使用性能，尤其利用ε-己内酯/聚醚/环氧丙烷三元共聚物的低温柔韧性和热稳定性来使复合膜适用于作为冷冻保存食品的蒸煮包装袋。
上述防粘连剂都是本领域已知的具有防粘连作用的物质，虽然都能发挥良好的防粘连效果，但却不具备优化薄膜机械性能的作用，发明人通过对已有物质的筛选得到2-(1H-苯并吡唑-1-基)乙酰胺，该物质既具有防粘连作用又能在一定程度上优化薄膜机械性能。
所述防粘连剂为2-(1H-苯并吡唑-1-基)乙酰胺。2-(1H-苯并吡唑-1-基)乙酰胺虽然属于已知化合物，但将该化合物作为防粘连剂的应用不属于本领域的现有技术和公知常识，本发明通过将该化合物作为防粘连剂取得了优化薄膜加工性能的机械性能的技术效果。2-(1H-苯并吡唑-1-基)乙酰胺的结构式如下：
Figure BDA0002481099000000031
本发明的有益效果是：本发明以尼龙和蒸煮级氯化聚丙烯作为主料，通过添加加工助剂制得两层结构的NY/RCPP复合膜，所制复合膜兼具NY和RCPP的优点，并通过加工助剂的添加进一步优化所制复合膜的使用性能，所制复合膜无毒无害，具有优良的机械性能、阻隔性能和耐热性能，适用于作为高温蒸煮袋加工材料。
具体实施方式：
为了使本发明实现的技术手段、创作特征、达成目的与功效易于明白了解，下面结合具体实施例，进一步阐述本发明。
尼龙6购自东莞市塑宇化工有限公司；聚(甲基乙烯基醚/马来酸)共聚物购自湖北新景新材料有限公司，固体型；蒸煮级氯化聚丙烯购自苏州市文阁塑化有限公司；ε-己内酯/聚醚/环氧丙烷三元共聚物采用殷宁等在《化学推进剂与高分子材料》2016年第14卷第1期所公开的合成方法制得；
实施例1
(1)称取100g尼龙6、8g聚(甲基乙烯基醚/马来酸)共聚物和2g硬脂酰胺，混合均匀，得到NY层混合料；
(2)称取100g蒸煮级氯化聚丙烯、12gε-己内酯/聚醚/环氧丙烷三元共聚物和2g硬脂酰胺，混合均匀，得到RCPP层混合料；
(3)分别将NY层混合料和RCPP层混合料送入各自的螺杆挤出机中，熔融塑化，NY层混合料的挤出机I区温度220℃、II区温度230℃、III区温度240℃、IV区温度240℃、V区温度230℃，RCPP层混合料的挤出机I区温度130℃、II区温度140℃、III区温度150℃、IV区温度140℃、V区温度140℃，得到NY层熔体和RCPP层熔体；熔体经过滤器过滤后由计量泵送至模头处汇合，模头温度为230℃，流延冷却成型，采用25℃冷却辊冷却，最后按客户要求收卷、分切成对应规格的成品膜卷，膜厚80μm。
实施例2
实施例2与实施例1的区别之处在于将防粘连剂替换为等量的硬脂酸锌，其余操作完全相同。
实施例3
实施例3与实施例1的区别之处在于将防粘连剂替换为等量的2-(1H-苯并吡唑-1-基)乙酰胺，其余操作完全相同。
对比例1
对比例1与实施例1的区别之处在于未在NY层中添加聚(甲基乙烯基醚/马来酸)共聚物，其余操作完全相同。
对比例2
对比例2与实施例1的区别之处在于未在RCPP层中添加ε-己内酯/聚醚/环氧丙烷三元共聚物，其余操作完全相同。
依照ISO 527-3-2018测定上述实施例和对比例制得的复合膜的屈服抗张强度、断裂抗张强度和屈服断裂伸长率，测定结果如表1所示。
表1
Figure BDA0002481099000000041
由表1可知看出，上述实施例通过以2-(1H-苯并吡唑-1-基)乙酰胺作为防粘连剂和聚(甲基乙烯基醚/马来酸)共聚物、ε-己内酯/聚醚/环氧丙烷三元共聚物的添加能够提高所制复合膜的力学性能。
将上述实施例所制复合膜在121℃水中蒸煮30min或135℃下蒸煮15min，试验结果显示：复合膜表面不起皱、不变形，并且未释放有毒有害物质。
依照GB/T 1038-2000《塑料薄膜和薄片气体透过性试验方法压差法》测定上述实施例所制复合膜的氧气透过量，均小于0.5cm3/(m2.24h.0.1MPa)；依照GB/T 1037-88《塑料薄膜和片材透水蒸气性试验方法杯式法》测定上述实施例所制复合膜的水蒸气透过量，均小于0.5g/(m2.24h)。
以上显示和描述了本发明的基本原理和主要特征和本发明的优点。本行业的技术人员应该了解，本发明不受上述实施例的限制，上述实施例和说明书中描述的只是说明本发明的原理，在不脱离本发明精神和范围的前提下，本发明还会有各种变化和改进，这些变化和改进都落入要求保护的本发明范围内。本发明要求保护范围由所附的权利要求书及其等效物界定。

Claims (5)

1.高温蒸煮袋用NY/RCPP复合膜的加工方法，其特征在于：包括以下加工工序：
(1) 称取尼龙、聚(甲基乙烯基醚/马来酸)共聚物和防粘连剂，混合均匀，得到NY层混合料；
(2) 称取蒸煮级氯化聚丙烯、ε-己内酯/聚醚/环氧丙烷三元共聚物和防粘连剂，混合均匀，得到RCPP层混合料；
(3) 分别将NY层混合料和RCPP层混合料送入各自的螺杆挤出机中，熔融塑化，得到NY层熔体和RCPP层熔体；熔体经过滤器过滤后由计量泵送至模头处汇合，流延冷却成型，最后按客户要求收卷、分切成对应规格的成品膜卷；
所述尼龙、聚(甲基乙烯基醚/马来酸)共聚物、防粘连剂的质量比为100 : (3-12) :(1-5)；
所述蒸煮级氯化聚丙烯、ε-己内酯/聚醚/环氧丙烷三元共聚物、防粘连剂的质量比为100 : (5-20) : (1-5)。
2.根据权利要求1所述的高温蒸煮袋用NY/RCPP复合膜的加工方法，其特征在于：所述尼龙选自尼龙6、尼龙12、尼龙66中的一种或几种。
3.根据权利要求1所述的高温蒸煮袋用NY/RCPP复合膜的加工方法，其特征在于：所述防粘连剂为芥酸酰胺、硬脂酰胺、硬脂酸钙、硬脂酸锌、聚乙烯蜡、聚丙烯蜡中的一种或几种。
4.根据权利要求1所述的高温蒸煮袋用NY/RCPP复合膜的加工方法，其特征在于：所述挤出机温度为130-250℃，模头温度为130-250℃。
5.根据权利要求1所述的高温蒸煮袋用NY/RCPP复合膜的加工方法，其特征在于：所述冷却时冷却辊的温度为20-30℃。
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