聚碳酸亚丙酯生物降解渗水地膜的研制及性能分析

为了解决农田白色污染问题，选用大分子聚碳酸亚丙酯（PPC）和聚己二酸丁二醇酯/对苯二甲酸丁二醇酯（PBAT）两种生物降解材料以及强力渗水助剂为原料制备PPC生物降解渗水地膜，采用多次吹膜测试法对地膜的配方和工艺方案进行了优选，并通过万能拉力测试机、紫外老化试验箱等对地膜的力学性能和降解性能进行了表征。结果表明，按照优选方案A₉和A₂的配方和工艺，结合渗水地膜加工工艺，可以成功制备厚度为（0.007±0.002） mm的薄型PPC生物降解渗水地膜；以A₉和A₂为基础并进行优化处理后的工艺技术试制的6个产品的力学性能均能够达到GB/T 35795—2017标准要求；0.007 mm PPC生物降解渗水地膜60 d后开始出现横纵向裂口，180 d后降解率为77.06 %，365 d后降解率为95.72 %。

Preparation and Performance Analysis of PPC?based Biodegradable Water­Permeable Mulch Film

To solve the problems from the white pollution in farmlands， macromolecular poly（propylene carbonate） （PPC） and poly（butylene adipate-co?butylene terephthalate） （PBAT） were selected as two types of biodegradable materials together with powerful water permeability additives to prepare the PPC biodegradable water-permeable mulch films. The formulation and processing technology of the mulch films were optimized using the multi?blow film method， and their mechanical properties and degradation performance were characterized using a universal tensile tester and ultraviolet aging test box. The results indicated that according to the optimized formulation and processing technology of the preferred scheme A₉ and A₂， a thin PPC-based biodegradable water-permeable mulch film with a thickness of （0.007±0.002） mm was successfully prepared using a water-permeable mulch film processing technology. The mechanical properties of six products trial-produced based on the schemes A₉ and A₂ could meet the requirements of GB/T 35795-2017. The membrane surface of the mulch film with a thickness of 0.007 mm began to crack within 60 days， and its degradation degree was 77.06 % and 95.72 % within 180 and 360 days， respectively.