Low-temperature cyclic dyeing method of polylactic acid fibers

Abstract

The invention relates to the technical field of dyeing and finishing, and discloses a polylactic acid fiber low-temperature cyclic dyeing method, which comprises: 1) modifying curcumin with 12-bromo-1-dodecanol to obtain a modified curcumin dye; 2) preparing a pre-emulsion from an emulsifier and a deep-eutectic solvent composed of coumarin and thymol, and carrying out modification treatment on the polylactic acid fiber; and 3) performing low-temperature cyclic dyeing. According to the invention, long alkyl chain grafted curcumin is used for modification, so that the hydrophobic compatibility and fixation stability of curcumin can be improved, and the diffusion and fixation capability of curcumin in PLA fibers can be enhanced; the coumarin / thymol is used for carrying out surface modification on the PLA fiber, so that the surface affinity and dyeability of the PLA fiber can be improved on the premise of not damaging the body structure and mechanical properties of the fiber. After the PLA fiber and the PLA fiber are combined, the PLA fiber can be efficiently dyed under low-temperature and normal-pressure conditions, and high dyeing depth and excellent color fastness can be obtained by matching with a low-temperature circulating dyeing process, so that the aims of energy conservation, emission reduction and recyclable green dyeing and finishing are fulfilled.