可降解熔喷PLA非织造材料制备及其过滤性能研究

Preparation and filtration performance of degradable melt-blown polylactic acid nonwovens

利用一种市售的低分子量聚乳酸(PLA-6252D)树脂和1600mm宽幅熔喷生产线,研究可降解PLA熔喷非织造材料的加工成型及工艺参数对其纤维结构和过滤性能的影响。为制备高效低阻PLA熔喷非织造布,研究并输出了贴近于工业量产的材料、工艺和技术方案。确定了最佳的工艺条件:挤出温度为170~180℃,模具温度和加工空气温度分别设置为270℃和275℃,单个模具孔聚合物通量为1.2g/min,加工气流为1500m^(3)/h。重点研究了接受距离(DCD)对材料性能的影响,DCD为10~15cm最佳,此时纤维直径在4~5μm,横纵向力学性能优异;纤维直径对过滤效率影响较大,DCD为15cm时,过滤效率达到93.8%,阻力为20.8Pa/cm^(2),达到工业过滤应用的性能要求。

A commercially available low-molecular-weight polylactic acid(PLA-6252D)resin and a 1600mm wide-width melt-blowout production line were used to study the processing and molding of degradable melt-blowout nonwoven material of PLA and the effects of process parameters on its fiber structure and filtration performance.In order to prepare PLA melt-blown nonwovens with high efficiency and low resistance,the material,process and technical scheme that resembled industrial mass production were studied and output.The optimum process conditions were determined:extrusion temperature was 170~180℃,mold temperature and processing air temperature were set at 270℃ and 275℃,respectively,polymer flux of single mold hole was 0.6g/min,and processing air flow was 1500m^(3)/h.The influence of die to collector distance(DCD)on the properties of the material was studied.The optimal DCD was 10~15cm,and the fiber diameter was about 4~5μm,which showed excellent transverse and longitudinal mechanical properties.'The fiber diameter had a great influence on the filtration efficiency.When DCD was 15cm,the filtration.efficiency could reach 93.8%and the resistance was 20.8Pa/cm^(2),meeting the performance requirements of industrial filtration applications.