CN112063028A - 生物可降解树脂包装膜及制备方法 - Google Patents
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Abstract
本发明公开了薄膜生产领域的一种生物可降解树脂包装膜及制备方法。配比组份按重量百分比:淀粉15~24%;山梨醇8~12%;二甘醇3~7%;硬脂酸0.1~0.5%;硬脂酸钙0.2~0.8%;单甘脂1.5~25%;乙烯酸共聚物5~10%;低密度聚乙烯25~30%;高密度聚乙烯11~13%;甘油10~20%;聚乳酸溶液10~20%。本发明的高强度生物降解热塑性淀粉树脂,具有较高的拉伸强度、断裂伸长率、撕裂强度和热合强度,生物降解率大于40%,使用食品级淀粉制备更环保无害和有利于降低降解产品的成本等优点。
Description
技术领域
本发明涉及薄膜生产领域的一种生物可降解树脂包装膜及制备方法。
背景技术
近年来,随着石油、煤等不可再生资源的日趋枯竭以及人们环保和食品安全意识的增强,越来越多的科研人员致力于开发应用于农业、食品和环境工程等领域的天然聚合物材料。这些材料以天然聚合物包括蛋白、淀粉、纤维素和壳聚糖等为原料,相比较石油合成的塑料制品其最大的优点就是来源丰富、可再生、安全无毒、可生物降解。
通过将淀粉和添加剂等在有外加水的条件下使淀粉糊化,同时使聚乙烯、乙烯-醋酸乙烯与淀粉共混,造粒得到可可生物降解的树脂,在延膜机生产线上熔融塑化,通过剂量共挤出流延,得到生物可降解树脂包装膜。
发明内容
本发明的目的在于提供一种生物降解性能优异的高强度生物可降解树脂包装膜及制备方法。
本发明是通过以下技术方案实现的:
一种生物可降解树脂包装膜,其特征在于:配比组份按重量百分比如下:
对上述技术方案做进一步的说明:所述淀粉为食品级淀粉,淀粉的细度80~200目;水份10~15%wt;所述淀粉为玉米淀粉、小麦淀粉、木薯淀粉、红薯淀粉、土豆淀粉中的任意一种或几种;
对上述技术方案做进一步的说明:所述乙烯共聚物的熔融指数为6~15g/10min,密度:0.93g/cm3,乙烯共聚物具有优良的耐磨性、低温抗冲击性、韧性和对各种极性材料的粘接性,做为淀粉的相容剂;对上述技术方案做进一步的说明:所述低密度乙烯的熔融指数为2g/10min,密度:0.94g/cm3,低密度乙烯具有表面光泽好、低温韧性、高弯曲和耐劲开裂性;
对上述技术方案做进一步的说明:所述高密度聚乙烯的数均分子量为20~30万,分子量分布多分散性系数为1-2;熔融指数为0.1~0.4g/10min,密度为0.95~0.965g/cm3;
对上述技术方案做进一步的说明:所述聚乳酸溶液氯仿溶解的聚乳酸溶液,聚乳酸浓度为0.1%;
生物可降解树脂包装膜的制备方法包括下列步骤:
1)食品级淀粉超细化处理,使其细度为80~200目,过筛;
2)在细化处理的淀粉中加入平衡量的水,使淀粉的含水量达到10~15%wt;
3)按配方比例在含水的淀粉中加入山梨醇、二甘醇、硬脂酸、硬脂酸钙和单甘脂,在高速混合机内混合均匀成糊化状浆料;
4)作为增塑剂的甘油添加到糊化的淀粉中浆料中,添加甘油的淀粉中浆料在80±1℃恒温水浴条件下搅拌处理30min,然后冷却到50±1℃,在冷却后再添加氯仿溶解的聚乳酸溶液,确保聚乳酸浓度为0.1%,聚乳酸共混可以很好的改善复合膜的耐水性和机械强度;
5)加入将预糊化好按配比加入的物料加入双螺杆挤出机于170~180℃进行糊化接枝;
6)维持温度在166~168℃过滤、挤出造粒得到生物可降解树脂;
7)生物可降解树脂料在挤流延膜机生产线上熔融塑化,通过计量共挤出流延,得到生物可降解树脂包装膜。
本发明的生物可降解树脂包装膜及制备方法具有其产品在有微生物环境下极易分解、使用食品级淀粉制备更环保无害和有利于降低降解产品的成本等优点。
具体实施方式
下面结合实施例对本发明做进一步的详细说明:本实施例在以本发明技术方案为前提下进行实施,给出了详细的实施方式,但本发明的保护范围不限于下述实施例。
实施例
按重量组份百分比配方:
食品级玉米淀粉25,山梨醇10,二甘醇5,硬脂酸0.2,硬脂酸钙0.4,单甘脂1,乙烯酸共聚物(EAA)8,低密度聚乙烯30,高密度聚乙烯12,甘油15,聚乳酸溶液10;
食品级淀粉的细度80目,水份12%wt;单甘酯密度:0.916g/cm3;酯含量>30%;所述的EAA的熔融指数为6~15g/10min,密度:0.93g/cm3,所述的EVA的熔融指数为2g/10min,密度:0.94g/cm3,食品级淀粉为玉米淀粉、小麦淀粉、木薯淀粉、红薯淀粉、土豆淀粉中的任意一种。
制备过程如下:
1)将食品级淀粉进行超细化处理,使其细度为100目,过筛,
2)将其余组分加入,加入2.4Kg的水,
3)在高速混合机内混合均匀完成预糊化,
甘油做增塑剂,80±1℃恒温水浴并不断搅拌加热处理30min,冷却到50±1℃,添加氯仿溶解的聚乳酸溶液,确保聚乳酸浓度为0.1%(w/v),维持温度30min,
4)将预糊化好的物料加入双螺杆挤出机于170~180℃下进行糊化接枝,
5)维持温度在166~168℃过滤、挤出造粒得到高强度生物降解热塑性淀粉树脂;
6)生物可降解树脂料在挤流延膜机生产线上熔融塑化,通过剂量共挤出流延,得到生物可降解树脂包装膜。
产品性能检测如下:
制品生物质含量>50%
制品拉伸强度>15Mpa
制品断裂伸长率 200%
制品撕裂强度 100N
制品热合强度 100N
邵氏硬度65
以上所述,仅为本发明较佳的具体实施方式,这些具体实施方式都是基于本发明整体构思下的不同实现方式,且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,可轻易想到的变化或替换,都应涵盖在本发明的保护范围之内,本发明的保护范围应该以权利要求书的保护范围为准。
Claims (7)
1.一种生物可降解树脂包装膜,其特征在于:配比组份按重量百分比如下:
淀粉 15~24%
山梨醇 8~12%
二甘醇 3~7%
硬脂酸 0.1~0.5%
硬脂酸钙 0.2~0.8%
单甘脂 1.5~25%
乙烯酸共聚物 5~10%
低密度乙烯 25~30%
高密度聚乙烯 11~13%
甘油 10~20%
聚乳酸溶液 10~20%。
2.根据权利要求1所述的生物可降解树脂包装膜及制备方法,其特征在于:所述淀粉为食品级淀粉,淀粉的细度80~200目;水份10~15%wt;所述淀粉为玉米淀粉、小麦淀粉、木薯淀粉、红薯淀粉、土豆淀粉中的任意一种或几种。
3.根据权利要求1所述的生物可降解树脂包装膜及制备方法,其特征在于:所述乙烯共聚物的熔融指数为6~15g/10min,密度:0.93g/cm3。
4.根据权利要求1所述的生物可降解树脂包装膜及制备方法,其特征在于:所述低密度乙烯的熔融指数为2g/10min,密度:0.94g/cm3。
5.根据权利要求1所述的生物可降解树脂包装膜及制备方法,其特征在于:所述高密度聚乙烯的数均分子量为20~30万,分子量分布多分散性系数为1-2;熔融指数为0.1~0.4g/10min,密度为0.95~0.965g/cm3。
6.根据权利要求1所述的生物可降解树脂包装膜及制备方法,其特征在于:所述聚乳酸溶液为氯仿溶解的聚乳酸溶液,聚乳酸浓度为0.1%。
7.如权利要求1至6任一项所述的生物可降解树脂包装膜的制备方法,包括下列步骤:
1)食品级淀粉超细化处理,使其细度为80~200目,过筛;
2)在细化处理的淀粉中加入平衡量的水,使淀粉的含水量达到10~15%wt;
3)按配方比例在含水的淀粉中加入山梨醇、二甘醇、硬脂酸、硬脂酸钙和单甘脂,在高速混合机内混合均匀成糊化状浆料;
4)作为增塑剂的甘油添加到糊化的淀粉中浆料中,添加甘油的淀粉浆料在80±1℃恒温水浴条件下搅拌处理30min,然后冷却到50±1℃,在冷却后再添加氯仿溶解的聚乳酸溶液,确保聚乳酸浓度为0.1%;
5)加入将预糊化好按配比加入的物料加入双螺杆挤出机于170~180℃进行糊化接枝;
6)维持温度在166~168℃过滤、挤出造粒得到生物可降解树脂;
7)生物可降解树脂料在挤流延膜机生产线上熔融塑化,通过计量共挤出流延,得到生物可降解树脂包装膜。
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CN113354888A (zh) * | 2021-06-09 | 2021-09-07 | 福建新达人塑胶制品有限公司 | 一种环保可降解塑料薄膜的生产工艺 |
CN114506052A (zh) * | 2022-02-24 | 2022-05-17 | 北京化工大学 | 一种界面可控的材料基因重组共混改性技术 |
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CN114506052A (zh) * | 2022-02-24 | 2022-05-17 | 北京化工大学 | 一种界面可控的材料基因重组共混改性技术 |
CN114506052B (zh) * | 2022-02-24 | 2022-12-27 | 北京化工大学 | 一种界面可控的材料基因重组共混改性方法 |
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