This work aims to prepare bio-based polymer composite fiber using poly(lactic acid) (PLA) and ground tea leaves (GTL) as a matrix and bio-based filler, respectively, via the melt-spinning process. The masterbatch obtained from PLA and GTL, with a mass ratio of 90:10, was varied as 0–20 phr, for mixing with PLA to prepare the green composite fibers. The fibers were then characterized using a SEM, UTM and DSC technique. The composite fibers showed a slightly rough surface in their cross-section. Tensile strength and elongation at break of the composite fibers were found to be the highest for the fiber prepared by adding 5 phr masterbatch. This is consistent with the good dispersion of GTL particles in the PLA matrix. The thermal properties of the composite fibers did not significantly change with an increasing amount of GTL. The dye removal properties of the composite fibers showed that the removal efficiency of methylene blue dye was more than reactive blue-19 dye after 24 h under room temperature conditions. By the knitting fabric manufacturing process, the obtained green composite fibers with the best mechanical properties were used as an eco-friendly textile to make fabrics with the antimicrobial property.

本工作旨在通过熔纺工艺分别以聚乳酸（PLA）和磨碎的茶叶（GTL）为基质和生物基填料制备生物基聚合物复合纤维。由 PLA 和 GTL 获得的母料，质量比为 90:10，变化为 0-20 phr，用于与 PLA 混合制备绿色复合纤维。然后使用 SEM、UTM 和 DSC 技术对纤维进行表征。复合纤维在其横截面中显示出略微粗糙的表面。发现复合纤维的拉伸强度和断裂伸长率对于通过添加 5 份母料制备的纤维来说是最高的。这与 GTL 颗粒在 PLA 基质中的良好分散是一致的。随着 GTL 用量的增加，复合纤维的热性能没有显着变化。复合纤维的染料去除性能表明，在室温条件下24 h后，对亚甲基蓝染料的去除效率高于活性蓝19染料。通过针织物制造工艺，将获得的具有最佳机械性能的绿色复合纤维用作环保纺织品，制成具有抗菌性能的织物。