The invention provides a direct
dyeing process for a chemical
fiber. The direct
dyeing process for the chemical
fiber comprises the steps of pretreatment, pre-shaping, modification treatment,
dyeing, soaping, color fixing, after-treatment,
drying,
sizing, calendaring and rolling. According to the direct dyeing process for the chemical
fiber, the modification treatment is added, so that performances of a chemical fabric are subjected to the modification treatment basically, the dyeing degree of the fabric is increased, and the difficulty of a subsequent dyeing step is reduced; during dyeing, the
mass utilization of inorganic salt is avoided; furthermore, substitute alkali is used for replacing a conventional
sodium carbonate substance, so that the consumption is reduced, a color fixation effect is also improved, and the washing fastness of the chemical fiber is further improved; soaping and color fixing processes are added, so that the dyeing fastness is good; environment-protection
formaldehyde-free TCD-R is utilized in the color fixing process, and color-fixed fibers are gradually dried, so that the firmness of the fibers is greatly improved; the post-treatment process is added, so that the color fastness and the flexibility of the fabric are improved, the roughness of the fabric is reduced, and the fabric is fluffy and has high resilience.