Stock solution coloring polylactic acid fiber and preparation method thereof

The invention relates to the technical field of lactic acid fibers, in particular to a dope-dyed polylactic acid fiber and a preparation method thereof. The preparation method comprises the following steps: preparing special color master batches for polylactic acid fibers from polylactic acid as a base material, micron-sized toner, a high-efficiency dispersant and the like, extruding and granulating the components such as the color master batches, polylactic acid, a modifier and the like through a mixing mill and a double-screw extruder, and spinning through a spinning machine to prepare the dope-dyed polylactic acid fibers which are free of flower color/mixed color and are capable of reducing the phenomenon of barrel explosion. The color master batch is uniformly melted and dispersed in the polylactic acid spinning crystallization process, so that the rigidity of the polylactic acid fiber can be improved. 本发明涉及乳酸纤维技术领域，特别涉及一种原液着色聚乳酸纤维及其制备方法。本发明以聚乳酸为基材、微米级色粉和高效分散剂等制得聚乳酸纤维专用色母粒，然后采用色母粒、聚乳酸和改性剂等成分通过混炼机和双螺杆挤出机挤出