| abstract |
PROBLEM TO BE SOLVED: To provide a dyeing method capable of dyeing para-aramid fibers into various hues and obtaining para-aramid fiber dyeings excellent in dyeing fastness. SOLUTION: Para-aramid fiber is N-methyl-2-. Treat with pyrrolidone and then stain. N-methyl-2 -The treatment with pyrrolidone is immersion treatment, and the treatment time [A (Sec)] and the processing temperature [T (absolute temperature ° K)] ogA ≧ 3.94 × 103 × (1 / T) −7.70 (However, 1.0 ≦ logA ≦ 6.3, 283 ≦ T ≦ 47 7) is preferably satisfied, and the dyeing temperature is 120 ° C. It is desirable that this is the case. |