Method for preparing meta-aramid colored fiber

Abstract

The invention discloses a method for preparing meta-aramid colored fiber. The invention comprises the following steps: an inorganic pigment is ball-milled and dispersed, and is mixed with an organic solvent and stirred to obtain a dyeing solution, a PMIA spinning solution is prepared, then defoaming is carried out, the meta-aramid fiber is subjected to spinning by a wet method, solidification andwashing with water to prepare mixed liquor of the dyeing solution and a spinning solution, an extruder is connected to a spinneret and directly introduced into coagulation bath, and steps of hot drawing, curling, cutting out and package are carried out to obtain the meta-aramid colored fiber. In the above manner, the method utilizes spinning solidification and the micropores in the fiber after washing to dye the fiber, and the color of the pigment entering a fiber surface layer is easily replaced, and a coloring agent is added at the same time, which saves a path and is easy to alternate color.

Description

technical field [0001] The invention relates to the field of meta-aramid fibers, in particular to a method for preparing colored meta-aramid fibers. Background technique [0002] Meta-aramid fiber is a kind of high-temperature-resistant fiber variety with early development, wide application, large output and fast development. Its total amount ranks second in special fibers. Amine, also known as aramid 1313, meta-aramid is a regularly arranged zigzag macromolecule, which has been decomposed before melting. The glass transition temperature Tg is 270°C, and no obvious decomposition and carbonization will occur below 350°C. When the temperature exceeds 400°C, the fiber will gradually become brittle, carbonized and decomposed, but no molten droplets will be produced; it will not burn in the flame, and has good flame retardancy. The limiting oxygen index LOI is 29%-32%, and the performance is excellent. good. [0003] At present, the dyeing of meta-aramid fibers is difficult, wh...

AI Technical Summary

Problems solved by technology

[0003] At present, the dyeing of meta-aramid fibers is difficult, which limits the application of meta-aramid fibers in the field of clothing. Therefore, meta-aramid fibers are mostly used to directly add pigments to poly-m-phenylene isophthalamide spinning solution. Spinning to prepare colored meta-aramid fibers, the existing process has long mixing process of poly-m-phenylene isophthalamide spinning solution and pigment slurry, complex process for color replacement, serious waste of slurry, time-consuming and laborious cleaning, etc. shortcoming