淀粉基塑料购物袋性能表征研究

Property Characterization of Starch-based Plastic Shopping Bag

目的通过对淀粉基塑料购物袋的理化性能表征,了解淀粉基塑料购物袋使用特性,为改善淀粉基塑料购物袋使用性能提供一些理论依据。方法采用热重分析(TG)、热机械分析(TMA)等手段对淀粉基塑料购物袋的淀粉含量及耐热性能进行分析,借助电子万能材料试验机对淀粉基塑料购物袋的力学性能进行分析,以及利用霉菌培养、总迁移行为探究等方法对淀粉基塑料购物袋霉变程度、卫生性能进行分析。结果样品A、B、C淀粉质量分数分别为15.72%、23.97%、30.36%,耐热性能比传统PE塑料袋要低;淀粉基塑料购物袋的拉伸强度随淀粉含量的增大而减小,断裂伸长率随淀粉含量的增加而增加,总迁移量结果随淀粉含量增加而增大,但经三氯甲烷处理后均低于限量要求;淀粉基塑料购物袋不适宜盛装酸性和低乙醇类食品。结论通过对淀粉基塑料购物袋深入研究,发现淀粉基塑料购物袋在力学性能、总迁移量、霉变程度存在缺陷,望研究者们可以从这几个方向入手,改善淀粉基塑料购物袋的理化性能。

The work aims to understand the use characteristics of starch-based plastic shopping bag through the characterization on the physical and chemical properties of starch-based plastic shopping bag,so as to provide some theoretical basis for improving the properties of starch-based plastic shopping bag.The starch content and heat resistance of starch-based plastic shopping bag were analyzed by means of thermogravimetric analysis and thermomechanical analysis,and the mechanical properties of starch-based plastic shopping bag were analyzed by electronic universal material testing machine.Then,the mildew degree and hygienic performance of starch-based plastic shopping bag were analyzed by the methods of mold culture and total migration behavior.The starch contents of samples A,B,and C were 15.72%,23.97%,and 30.36%,respectively,and the heat resistance was lower than that of traditional PE plastic bags.The tensile strength of starch-based plastic shopping bag decreased with the increase of starch content,but the elongation at break and the total migration amount increased with the increase of starch content,which were all lower than the limit requirements after treatment with chloroform.Therefore,starch-based plastic shopping bag was not suitable for acid and low-ethanol food.Through in-depth research on starch-based plastic shopping bag,it is found that starch-based plastic shopping bag has defects in mechanical properties,total migration amount,and degree of mildew.It is hoped that researchers can start from these directions to improve the physical and chemical properties of starch-based plastic shopping bag.