Method for producing colored short fibers by using regenerated polylactic acid slices

Abstract

The invention relates to a method for producing colored short fibers by using regenerated polylactic acid slices. A regenerated PLA material is used as a raw material. The method comprises the following specific production steps of: (1) pretreatment; (2) rotary drum drying; (3) melt spinning; (4) cooling molding; (5) winding; (6) drafting; (7) curling; (8) curling; (9) heat setting; and (10) cutting off. The method of the invention has the advantages that the regenerated PLA material is used as the raw material, the cost is reduced, the environmental protection is favorable, the finished product has low linear density, feels smooth, and has bright and uniform color, and high color fastness. The characteristics of polylactic acid short fiber are kept, the damage of post-dyeing to the polylactic acid short fiber property is also avoided, the pollution of dyeing to the environment is reduced, and the method is extremely beneficial to a spinning material and environmental protection.

Description

technical field [0001] The invention relates to the technical field of polylactic acid fiber textile production, in particular to a method for producing colored short fibers by utilizing regenerated polylactic acid chips. Background technique [0002] Conventional production methods generally use disperse dyes to dye polylactic acid staple fibers, which need to be carried out under high temperature and high pressure or the presence of carriers, which will cause great damage to the fibers, poor color fastness, and a narrow dyeing chromatogram range. [0003] At present, colored polylactic acid staple fibers are used to replace ordinary polylactic acid staple fibers for fabric production. Colored polylactic acid staple fibers are generally processed and spun from raw materials, melted and mixed with masterbatch, and the cost is high; PLA is also used. Recycled PLA materials such as block materials and waste silk produced during the production process are used as raw materials ...

AI Technical Summary

Problems solved by technology

However, due to the uneven quality of recycled PLA materials, their intrinsic viscosity and melting point are very different from those of PLA chips processed from raw materials, which seriously affects the spinning quality.

[0004] The color masterbatch is obtained by mixing, melting and granulating the colorant, carrier and dispersant. The addition of the color masterbatch during spinning will change the viscosity of the melt in the spinning assembly and cause friction to the equipment. The conventional recycled PLA production method is limited. Due to limited conditions, the linear density, color fastness and hand feel of PLA staple fibers cannot achieve the desired results