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 recycled polylactic acid slices, using recycled PLA materials as raw materials, and the specific production steps are as follows: (1) pretreatment; (2) drum drying; (3) melt spinning; (4) cooling forming; (5) winding; (6) drawing; (7) curling; (8) oiling; (9) heat setting; (10) cutting. The method of the invention adopts the regenerated PLA material as the raw material, reduces the cost and is beneficial to environmental protection. The finished product has low linear density, smooth hand feeling, bright and uniform color and high color fastness. It not only maintains the characteristics of the polylactic acid staple fiber itself, but also avoids the damage to the performance of the polylactic acid staple fiber caused by the subsequent dyeing, reduces the environmental pollution caused by dyeing, and is extremely beneficial to spinning materials 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