聚乳酸/纳米载银磷酸锆熔纺纤维制备及性能

利用双螺杆挤出机将聚乳酸(PLA)切片和纳米载银磷酸锆颗粒共混制备纳米载银磷酸锆质量分数为20%的PLA母粒。将母粒和纯PLA切片按照不同比例共混熔纺制备PLA/纳米载银磷酸锆共混纤维。研究了共混纤维的制备方法,运用扫描电子显微镜观察了纤维束外部形貌,测试了纤维的力学及抗菌性能。结果表明,纳米载银磷酸锆在纤维中有少量凝聚,总体分散均匀;随着纳米载银磷酸含量提升,纤维断裂强度先增大后降低,同时纤维的抗菌性不断增加。当载银磷酸锆含量达到1.5%时,纤维的断裂强度最大为0.85 c N/dtex,对大肠杆菌和金黄色葡萄球菌抑菌率达99.9%。

Preparation and Properties of Polylactic Acid/Nano Silver Loaded Zirconium Phosphate Melt-Spun Fibers

The polylactic acid (PLA) slice and nano silver loaded zirconium phosphate particles were mixed to prepare PLA masterbatch containing 20% mass fraction nano silver loaded zirconium phosphate by twin screw extruder. The masterbatch and pure PLA slice mixed at a different proportion were blended and melt spun to obtain different PLA/nano loaded silver zirconium phosphate blend fibers. The preparation of these blend fibers were discussed. The external morphology of the fiber bundles was observed by scanning electron microscope. The mechanical and antibacterial properties of thesefibers were tested. The results indicate that nano silver loaded zirconium phosphate particles are dispersed evenly in the blend PLA,though few particles aggregation appears. With the increase of the content of nano silver loaded zirconium phosphate,the fracture strength of thefiber increasesfirst and then decreases. When the content of silver zirconium phosphate is 1.5% by mass fraction,the maximum breaking strength of thefiber is 0.85 cN/dtex,and the antibacterial rate of the Escherichia coli and Staphylococcus aureus reaches 99.9%.