CN109320934A - 一种新型环保包装膜 - Google Patents
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Abstract
本发明公开了一种新型环保包装膜,其原料按重量份包括:30‑45份聚乳酸、40‑50份聚乙烯醇、3‑6份改性聚乳酸、8‑20份纳米纤维素、6‑15份增塑剂、2‑6份聚乙烯蜡、3‑5份二氧化硅、2‑7份氧化锌、1‑3份碳酸钙、1.0‑1.5份交联剂。本发明的新型环保包装膜,不仅具有良好的的生物可降解性,还具有良好的拉伸强度、抗弯强度、断裂伸长率、耐水性和抗菌性,适用范围广。
Description
技术领域
本发明涉及包装膜技术领域,具体涉及一种新型环保包装膜。
背景技术
塑料包装袋是日常生活中的易耗品,每年都要消耗大量的塑料包装袋。塑料包装袋提供便利的同时,由于过量使用及回收处理不到位等原因,也造成了严重的能源资源浪费和环境污染。特别是塑料包装袋容易破损,大多被随意丢弃,成为“白色污染”的主要来源。而随着塑料袋使用量的增大,越来越多的问题也出现了,使用后的塑料袋不易回收、不易降解,这些问题极大的困扰了人们。与倡导绿色环保理念不一致,如何寻找一种可降解、减少环境污染的塑料袋成为人们研究的热点。
发明内容
基于背景技术存在的技术问题,本发明提出了一种新型环保包装膜,具有良好的的生物可降解性、拉伸强度、抗弯强度、断裂伸长率、耐水性和抗菌性,适用范围广。
本发明提出了一种新型环保包装膜,其原料按重量份包括:30-45份聚乳酸、40-50份聚乙烯醇、3-6份改性聚乳酸、8-20份纳米纤维素、6-15份增塑剂、2-6份聚乙烯蜡、3-5份二氧化硅、2-7份氧化锌、1-3份碳酸钙、1.0-1.5份交联剂。
优选地,所述增塑剂包括甘油、聚乙二醇、尿素、邻苯二甲酸二辛酯。
优选地,所述甘油、聚乙二醇、尿素、邻苯二甲酸二辛酯的重量比为2-4:3-6:1-5:1-2。
优选地,所述改性聚乳酸的原料包括柠檬酸酯、马来酸酐、过氧化二异丙苯、聚乳酸。
优选地,所述柠檬酸酯、马来酸酐、过氧化二异丙苯、聚乳酸的重量比为1-3:1-2:0.6-1.0:25-32。
优选地,所述改性聚乳酸的制备工艺如下:将柠檬酸酯、马来酸酐、过氧化二异丙苯溶于丙酮中,并与聚乳酸粒料混合均匀,放置,进行混炼,挤出,冷却,切粒,干燥,得到改性聚乳酸。
优选地,所述放置的时间为8-15h。
优选地,所述混炼的温度为175℃,混炼时间8-10min,混炼的转速50-60r/min。
优选地,所述干燥的温度为50-55℃,干燥时间为10-20h。
本发明可以通过本领域常规方法制备得到。
本发明的新型环保包装膜以聚乳酸、聚乙烯醇、改性聚乳酸、纳米纤维素、增塑剂、聚乙烯蜡、二氧化硅、氧化锌、碳酸钙、交联剂为原料,具有良好的的生物可降解性,还具有良好的拉伸强度、抗弯强度、断裂伸长率、耐水性和抗菌性,满足实际应用中的性能需求。本发明添加聚乳酸、聚乙烯醇、纳米纤维素,使得包装膜具有较好的降解性能,减少对环境的污染,保护环境;本发明添加甘油、聚乙二醇、尿素、邻苯二甲酸二辛酯等作为增塑剂使用,多种增塑剂共同使用,不仅能够获得较好的相容性,还能够提升包装膜的综合性能,可以在提高包装膜断裂伸长率的同时不降低材料的拉伸强度;本发明添加的改性聚乳酸是利用柠檬酸酯、马来酸酐、过氧化二异丙苯共同对聚乳酸进行接枝改性得到的,改性聚乳酸与纳米纤维素之间可形成酯键,能够促进纳米纤维素与聚乳酸间的相容性,进而可以提升包装膜材料的韧性、耐水性和耐热性;本发明中,原料之间的相容性较好,分散均匀,使得本发明的包装膜的综合性能优异。
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。
实施例1
一种新型环保包装膜,其原料按重量份包括:45份聚乳酸、40份聚乙烯醇、6份改性聚乳酸、8份纳米纤维素、15份增塑剂、2份聚乙烯蜡、5份二氧化硅、2份氧化锌、3份碳酸钙、1.0份交联剂;
其中,所述增塑剂包括甘油、聚乙二醇、尿素、邻苯二甲酸二辛酯;所述甘油、聚乙二醇、尿素、邻苯二甲酸二辛酯的重量比为4:3:5:1;所述改性聚乳酸的原料包括柠檬酸酯、马来酸酐、过氧化二异丙苯、聚乳酸;所述柠檬酸酯、马来酸酐、过氧化二异丙苯、聚乳酸的重量比为3:1:1.0:25;
所述改性聚乳酸的制备工艺如下:将柠檬酸酯、马来酸酐、过氧化二异丙苯溶于丙酮中,并与聚乳酸粒料混合均匀,放置15h后,进行混炼,混炼温度150℃,混炼转速60r/min,混炼时间8min,挤出,冷却,切粒,在55℃下干燥10h,得到改性聚乳酸。
实施例2
一种新型环保包装膜,其原料按重量份包括:30份聚乳酸、50份聚乙烯醇、3份改性聚乳酸、20份纳米纤维素、6份增塑剂、6份聚乙烯蜡、3份二氧化硅、7份氧化锌、1份碳酸钙、1.5份交联剂;
其中,所述增塑剂包括甘油、聚乙二醇、尿素、邻苯二甲酸二辛酯;所述甘油、聚乙二醇、尿素、邻苯二甲酸二辛酯的重量比为2:6:1:2;所述改性聚乳酸的原料包括柠檬酸酯、马来酸酐、过氧化二异丙苯、聚乳酸;所述柠檬酸酯、马来酸酐、过氧化二异丙苯、聚乳酸的重量比为1:2:0.6:32;
所述改性聚乳酸的制备工艺如下:将柠檬酸酯、马来酸酐、过氧化二异丙苯溶于丙酮中,并与聚乳酸粒料混合均匀,放置8h后,进行混炼,混炼温度160℃,混炼转速50r/min,混炼时间10min,挤出,冷却,切粒,在50℃下干燥20h,得到改性聚乳酸。
实施例3
一种新型环保包装膜,其原料按重量份包括:37份聚乳酸、45份聚乙烯醇、5份改性聚乳酸、14份纳米纤维素、11份增塑剂、4份聚乙烯蜡、4份二氧化硅、5份氧化锌、2份碳酸钙、1.3份交联剂;
其中,所述增塑剂包括甘油、聚乙二醇、尿素、邻苯二甲酸二辛酯;所述甘油、聚乙二醇、尿素、邻苯二甲酸二辛酯的重量比为3:5:3:1.5;所述改性聚乳酸的原料包括柠檬酸酯、马来酸酐、过氧化二异丙苯、聚乳酸;所述柠檬酸酯、马来酸酐、过氧化二异丙苯、聚乳酸的重量比为2:1.5:0.8:28;
所述改性聚乳酸的制备工艺如下:将柠檬酸酯、马来酸酐、过氧化二异丙苯溶于丙酮中,并与聚乳酸粒料混合均匀,放置12h后,进行混炼,混炼温度155℃,混炼转速50r/min,混炼时间9min,挤出,冷却,切粒,在52℃下干燥15h,得到改性聚乳酸。
对比例1
对比例1的包装膜与实施例3相比,区别仅在于:未添加改性聚乳酸,其他条件与实施例3完全相同。
对比例2
对比例2的包装膜与实施例3相比,区别仅在于:添加的增塑剂仅包括甘油,其他条件与实施例3完全相同。
试验例1
分别对本发明实施例1-3和对比例1、2的包装膜进行力学性能的检测,结果如表1所示。
表1
项目 | 拉伸强度(MPa) | 断裂伸长率(%) |
实施例1 | 14.6 | 115 |
实施例2 | 15.5 | 119 |
实施例3 | 16.3 | 125 |
对比例1 | 10.2 | 71 |
对比例2 | 10.5 | 75 |
由表1可以看出,本发明的新型环保包装膜具有良好的机械性能。
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 (9)
1.一种新型环保包装膜,其特征在于,其原料按重量份包括:30-45份聚乳酸、40-50份聚乙烯醇、3-6份改性聚乳酸、8-20份纳米纤维素、6-15份增塑剂、2-6份聚乙烯蜡、3-5份二氧化硅、2-7份氧化锌、1-3份碳酸钙、1.0-1.5份交联剂。
2.根据权利要求1所述的新型环保包装膜,其特征在于,所述增塑剂包括甘油、聚乙二醇、尿素、邻苯二甲酸二辛酯。
3.根据权利要求2所述的新型环保包装膜,其特征在于,所述甘油、聚乙二醇、尿素、邻苯二甲酸二辛酯的重量比为2-4:3-6:1-5:1-2。
4.根据权利要求1所述的新型环保包装膜,其特征在于,所述改性聚乳酸的原料包括柠檬酸酯、马来酸酐、过氧化二异丙苯、聚乳酸。
5.根据权利要求4所述的新型环保包装膜,其特征在于,所述柠檬酸酯、马来酸酐、过氧化二异丙苯、聚乳酸的重量比为1-3:1-2:0.6-1.0:25-32。
6.根据权利要求1所述的新型环保包装膜,其特征在于,所述改性聚乳酸的制备工艺如下:将柠檬酸酯、马来酸酐、过氧化二异丙苯溶于丙酮中,并与聚乳酸粒料混合均匀,放置,进行混炼,挤出,冷却,切粒,干燥,得到改性聚乳酸。
7.根据权利要求6所述的新型环保包装膜,其特征在于,所述放置的时间为8-15h。
8.根据权利要求6所述的新型环保包装膜,其特征在于,所述混炼的温度为175℃,混炼时间8-10min,混炼的转速50-60r/min。
9.根据权利要求6所述的新型环保包装膜,其特征在于,所述干燥的温度为50-55℃,干燥时间为10-20h。
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