The number of sulfonic acid groups in the reactive dye molecule has a great influence on its affinity. When the concentration of Yuan Mingfen is 25 g/L, the affinity is increased by 130% after reducing one sulfonic acid group in the molecular structure of the dye; Yuan Ming When the powder concentration is 50 g/L, the affinity increases by about 60%, which creates conditions for low-salt staining.

However, a decrease in the number of sulfonic groups will affect the water solubility of the dye. Therefore, in order not to affect the water solubility of the dyes, this type of molecular structure has a high steric hindrance effect, such as the alkyl amino group as a linking group, so that the co-planarity of the dye molecules is weakened, the conjugation effect is correspondingly weakened, and the dye is hydrophilic The delocalization capacity of the group decreases, and the hydrophilicity of the hydrophilic group increases. Thus, the amount of inorganic salt can be significantly reduced by reducing the amount of sulfonic acid groups.
The Sumiflx Supra E-XF series of reactive dyes introduced by Sumitomo Chemical Co., Ltd. in 1996 is a reactive dye that is suitable for low-salt dyeing by reducing sulfonic acid groups. Its dark three-color primary colors contain chlorotriazine and vinylsulfone double. Active group. Only sodium sulfate (30g/L) can be added during dyeing, and the same effect can be obtained when adding 50g/L of Sumiflx Supra common dye. In 1998, Sumiflx Supra NF and Sumiflx HF were developed, and the amount of inorganic salt was only 60% of the general dye. , With 85% or more of high fixation rate, suitable for exhaust dyeing of 70 ~ 80 degrees, with good detergency, lifting force, especially suitable for deep and deep color dyeing, because of its fixation rate 85% ~ 90 %, the amount of residual dye in the dyeing wastewater is only 25% to 30% of the dyeing of general reactive dyes.

According to the characteristics of Sumiflx Supra E-XF dyes, the LETS staining method was proposed. The dyeing bath ratio was 1:10, and the amount of Yuan Ming powder was only 1/3 ~ 1/2 of that of ordinary type.

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