PBAT基降解薄膜的阻隔性能  

Barrier Properties of PBAT-Based Degradable Films

作　　者：李鑫[1] 李想 杨浦 LI Xin;LI Xiang;YANG Pu(Beijing Plastics R esearch Institute Co,Ltd,Beijing 100009,China)

机构地区：[1]北京市塑料研究所有限公司,北京100009

出　　处：《塑料》2024年第6期102-105,共4页Plastics

摘　　要：聚己二酸对苯二甲酸丁二酯(PBAT)是一种热塑性生物降解聚合物,具有良好的力学延展性和可加工流动性,主要通过溶液涂覆、挤出流延、吹塑成型等方式制备PBAT基降解薄膜,适用于农用薄膜、食品包装材料、医疗卫生以及能源等领域。但是,水分子极易与PBAT分子链上的酯基等基团发生水解反应,在PBAT基降解薄膜的表面发生溶胀现象,快速渗透到薄膜内部,而且,PBAT的分子作用力小,分子间距宽,气体分子能够在PBAT基降解薄膜内扩散,因此,PBAT基降解薄膜的阻隔性较差。采用熔融共混改性、纳米材料涂覆及双向拉伸技术等方法,在气体扩散的路径上设置隔离层,减少气体分子与PBAT薄膜表面的接触,增加气体分子在PBAT基降解薄膜的渗透路程,降低气体透过系数,提高PBAT基降解薄膜的阻隔性能,满足了农用薄膜对于保墒性能的要求,及食品包装材料对于食品保鲜性能的要求。Poly(butylene adipate terephthalate)(PBAT)is a thermoplastic biodegradable polymer with excellent mechanical ductility and processability.PBAT-based degradable films are mainly prepared by solution coating,extrusion casting and blow molding,and they are suitable for agricultural films,food packaging materials,medicine,energy and other fields.However,the groups such as ester groups on PBAT molecular chains are easily hydrolyzed by water molecules,and swelling occurs on the surface of the PBAT-based degradation film,which quickly penetrates into the film.Moreover,the molecular force of PBAT is small,and the molecular spacing is wide,gas molecules can diffuse in the PBAT-based degradation film,so the barrier property of the PBAT-based degradation film is bad.By means of melt blending modification,nano-material coating and biaxial stretching technology,the isolation layer is installed on the gas diffusion path,which reduces the contact opportunity between gas molecules and the surface of PBAT film,increases the permeation path of gas molecules in PBAT-based degradable film,thus reducing the gas permeability coefficient,improving the barrier performance of PBAT-based degradable film,and meeting the requirements of agricultural film for moisture retention and food packaging materials for food preservation.

关 键 词：聚己二酸对苯二甲酸丁二酯 降解 熔融共混 涂覆 双向拉伸 

分 类 号：TQ323.4[化学工程—合成树脂塑料工业]