CN109401155A - 一种可降解抗菌包装膜 - Google Patents

一种可降解抗菌包装膜 Download PDF

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CN109401155A
CN109401155A CN201811322235.7A CN201811322235A CN109401155A CN 109401155 A CN109401155 A CN 109401155A CN 201811322235 A CN201811322235 A CN 201811322235A CN 109401155 A CN109401155 A CN 109401155A
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姚何兵
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Anhui Jingle Plastic Industry Co Ltd
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Abstract

本发明公开了一种可降解抗菌包装膜,其原料按重量份包括:30‑40份聚乳酸、50‑60份聚乙烯醇、8‑20份改性竹纤维、2‑4份甘油、3‑6份聚乙二醇、1‑3份尿素、1‑2份柠檬酸三丁酯、3‑7份抗菌剂、2‑6份聚乙烯蜡、1‑3份碳酸钙、1‑1.5份交联剂。本发明的可降解抗菌包装膜,具有良好的的生物可降解性、抗菌性、力学性能及其耐水性。

Description

一种可降解抗菌包装膜
技术领域
本发明涉及包装膜技术领域,具体涉及一种可降解抗菌包装膜。
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,本发明提出了一种可降解抗菌包装膜,具有良好的的生物可降解性、抗菌性、力学性能及其耐水性。
本发明提出了一种可降解抗菌包装膜,其原料按重量份包括:30-40份聚乳酸、50-60份聚乙烯醇、8-20份改性竹纤维、2-4份甘油、3-6份聚乙二醇、1-3份尿素、1-2份柠檬酸三丁酯、3-7份抗菌剂、2-6份聚乙烯蜡、1-3份碳酸钙、1-1.5份交联剂。
优选地,所述抗菌剂包括壳聚糖、二氧化钛、氧化锌、姜黄根醇。
优选地,所述壳聚糖、二氧化钛、氧化锌、姜黄根醇的重量比为1-3:3-6:2-5:0.1-0.2。
优选地,所述改性竹纤维的原料包括竹纤维、醋酸酐、丙酸、醋酸。
优选地,所述改性竹纤维的制备工艺如下:将竹纤维放入甲苯中,超声处理,依次加入丙酸、醋酸、醋酸酐,搅拌,然后倒入乙醇溶液中,产生沉淀,离心,然后用蒸馏水洗涤,真空冷冻干燥,得到改性竹纤维。
优选地,所述超声处理的温度为0-5℃,超声时间为10-15min。
优选地,所述搅拌的温度为30-35℃,搅拌时间为1-3h。
优选地,所述离心的次数为3-4次,离心的转速为3000-5000r/min,每次离心时间为3-10min。
优选地,用蒸馏水洗涤2-4次。
优选地,所述真空冷冻干燥的操作具体为:在真空度为5-15Pa的条件下,先在-18到-10℃下干燥5-10h,再在-30到-20℃下干燥5-10h。
本发明可以通过本领域的常规方法制备得到。
本发明的可降解抗菌包装膜,以聚乳酸、聚乙烯醇、改性竹纤维、甘油、聚乙二醇、尿素、柠檬酸三丁酯、抗菌剂、聚乙烯蜡、碳酸钙、交联剂为原料,具有良好的的生物可降解性、抗菌性、力学性能及其耐水性。本发明采用了聚乳酸、聚乙烯醇、改性竹纤维为主料,其中聚乳酸和改性竹纤维的使用,使得本发明的包装膜具有很好的降解性,大大减少包装膜对环境的污染;本发明添加甘油、聚乙二醇、尿素、柠檬酸三丁酯等,起到很好的增塑作用,使得包装膜的力学性能得到显著的提升;添加的抗菌剂有壳聚糖、二氧化钛、氧化锌、姜黄根醇,在体系中的分散性较好,有效增强包装膜的抗菌性能;本发明添加的改性竹纤维,改性过程中,表面乙酰化和竹纤维的长径比减小,不仅提高了竹纤维的亲油性,还提高其与聚合物的相容性,进而使得包装膜的韧性得到提升。本发明的体系中,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
一种可降解抗菌包装膜,其原料按重量份包括:40份聚乳酸、50份聚乙烯醇、20份改性竹纤维、2份甘油、6份聚乙二醇、1份尿素、2份柠檬酸三丁酯、3份抗菌剂、6份聚乙烯蜡、1份碳酸钙、1.5份交联剂;
其中,所述抗菌剂包括壳聚糖、二氧化钛、氧化锌、姜黄根醇;所述壳聚糖、二氧化钛、氧化锌、姜黄根醇的重量比为1:6:2:0.2;所述改性竹纤维的原料包括竹纤维、醋酸酐、丙酸、醋酸;
所述改性竹纤维的制备工艺如下:将竹纤维放入甲苯中,超声处理10min,超声温度为5℃,依次加入丙酸、醋酸、醋酸酐,在30℃下搅拌3h,然后倒入乙醇溶液中,产生沉淀,以3000r/min的转速离心4次,每次离心时间为3min,然后用蒸馏水洗涤4次,真空冷冻干燥,在真空度为5Pa的条件下,先在-10℃下干燥10h,再在-30℃下干燥5h,得到改性竹纤维。
实施例2
一种可降解抗菌包装膜,其原料按重量份包括:30份聚乳酸、60份聚乙烯醇、8份改性竹纤维、4份甘油、3份聚乙二醇、3份尿素、1份柠檬酸三丁酯、7份抗菌剂、2份聚乙烯蜡、3份碳酸钙、1份交联剂;
其中,所述抗菌剂包括壳聚糖、二氧化钛、氧化锌、姜黄根醇;所述壳聚糖、二氧化钛、氧化锌、姜黄根醇的重量比为3:3:5:0.1;所述改性竹纤维的原料包括竹纤维、醋酸酐、丙酸、醋酸;
所述改性竹纤维的制备工艺如下:将竹纤维放入甲苯中,超声处理15min,超声温度为0℃,依次加入丙酸、醋酸、醋酸酐,在35℃下搅拌1h,然后倒入乙醇溶液中,产生沉淀,以5000r/min的转速离心3次,每次离心时间为10min,然后用蒸馏水洗涤2次,真空冷冻干燥,在真空度为15Pa的条件下,先在-18℃下干燥5h,再在-20℃下干燥10h,得到改性竹纤维。
实施例3
一种可降解抗菌包装膜,其原料按重量份包括:35份聚乳酸、55份聚乙烯醇、15份改性竹纤维、3份甘油、5份聚乙二醇、2份尿素、2份柠檬酸三丁酯、5份抗菌剂、4份聚乙烯蜡、2份碳酸钙、1份交联剂;
其中,所述抗菌剂包括壳聚糖、二氧化钛、氧化锌、姜黄根醇;所述壳聚糖、二氧化钛、氧化锌、姜黄根醇的重量比为2:5:3:0.2;所述改性竹纤维的原料包括竹纤维、醋酸酐、丙酸、醋酸;
所述改性竹纤维的制备工艺如下:将竹纤维放入甲苯中,超声处理13min,超声温度为2℃,依次加入丙酸、醋酸、醋酸酐,在32℃下搅拌2h,然后倒入乙醇溶液中,产生沉淀,以4000r/min的转速离心4次,每次离心时间为5min,然后用蒸馏水洗涤3次,真空冷冻干燥,在真空度为10Pa的条件下,先在-14℃下干燥8h,再在-25℃下干燥7h,得到改性竹纤维。
对比例1
对比例1的可降解抗菌包装膜与实施例3相比,区别仅在于添加的是竹纤维,未经过改性,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的包装膜进行力学性能和抗菌性能的检测,结果如表1所示。
表1
项目 拉伸强度(MPa) 断裂伸长率(%) 金黄色葡萄球菌杀菌率(%)
实施例1 15.2 116 94.3
实施例2 15.7 118 95.2
实施例3 16.2 120 96.1
对比例1 9.7 72 90.5
由表1可以看出,本发明的可降解抗菌包装膜具有良好的力学性能和抗菌性能。
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)

1.一种可降解抗菌包装膜,其特征在于,其原料按重量份包括:30-40份聚乳酸、50-60份聚乙烯醇、8-20份改性竹纤维、2-4份甘油、3-6份聚乙二醇、1-3份尿素、1-2份柠檬酸三丁酯、3-7份抗菌剂、2-6份聚乙烯蜡、1-3份碳酸钙、1-1.5份交联剂。
2.根据权利要求1所述的可降解抗菌包装膜,其特征在于,所述抗菌剂包括壳聚糖、二氧化钛、氧化锌、姜黄根醇。
3.根据权利要求2所述的可降解抗菌包装膜,其特征在于,所述壳聚糖、二氧化钛、氧化锌、姜黄根醇的重量比为1-3:3-6:2-5:0.1-0.2。
4.根据权利要求1所述的可降解抗菌包装膜,其特征在于,所述改性竹纤维的原料包括竹纤维、醋酸酐、丙酸、醋酸。
5.根据权利要求4所述的可降解抗菌包装膜,其特征在于,所述改性竹纤维的制备工艺如下:将竹纤维放入甲苯中,超声处理,依次加入丙酸、醋酸、醋酸酐,搅拌,然后倒入乙醇溶液中,产生沉淀,离心,然后用蒸馏水洗涤,真空冷冻干燥,得到改性竹纤维。
6.根据权利要求5所述的可降解抗菌包装膜,其特征在于,所述超声处理的温度为0-5℃,超声时间为10-15min。
7.根据权利要求5所述的可降解抗菌包装膜,其特征在于,所述搅拌的温度为30-35℃,搅拌时间为1-3h。
8.根据权利要求5所述的可降解抗菌包装膜,其特征在于,所述离心的次数为3-4次,离心的转速为3000-5000r/min,每次离心时间为3-10min。
9.根据权利要求5所述的可降解抗菌包装膜,其特征在于,用蒸馏水洗涤2-4次。
10.根据权利要求5所述的可降解抗菌包装膜,其特征在于,所述真空冷冻干燥的操作具体为:在真空度为5-15Pa的条件下,先在-18到-10℃下干燥5-10h,再在-30到-20℃下干燥5-10h。
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