Preparation method of dark brown reactive bisazo dye

Abstract

The invention relates to a preparation method of a dark brown reactive bisazo dye. In a structural formula of the dye, R1 is CH3, OCH3 or H; R2 is OCH3; R3 is -COCH3 or -CONH2; and R4 is H, -SO3H or -COOH3. The preparation method of the dye comprises the following steps: carrying out diazotization between 2,5bismethoxyl4(beta-hydroxyethylsulfatoethylsulfonyl)aniline and nitrous acid at 0-10 DEG C, coupling with semicarbazide, mixing with sodium nitrite at pH of 7.5-8, adding the mixture into hydrochloric acid and ice water to carry out diazotization, coupling with a gamma acid derivative, carrying out salting-out, filtering and drying. The prepared dark brown reactive bisazo dye has excellent properties of high lifting force, good leveldyeing property, good dyeing repeatability, high degree of dyeing and the like.

Description

technical field [0001] The invention relates to a preparation method of a dark brown reactive disazo dye. Background technique [0002] At present, consumers have higher and higher requirements for textiles. Printing and dyeing workers use common dual active groups (containing chloro-s-triazine and vinyl sulfone dual active groups) yellow, red and blue reactive dyes to fight coffee color when dyeing dark brown. There are certain differences among them in the affinity to fiber, the sensitivity of color uptake rate and fixation rate to saline and alkali, and the sensitivity to temperature solubility ratio. Therefore, the color reproducibility of the dyeing is poor, it is easy to cause color flowers, and the dyeing quality cannot be guaranteed. Therefore, it is required to produce a single-color brown reactive dye to ensure the dyeing quality. Contents of the invention [0003] The purpose of the invention is to provide a monochrome dark brown reactive disazo dye capable of ...

AI Technical Summary

Problems solved by technology

[0002] At present, the majority of consumers have higher and higher requirements for textiles. Printing and dyeing workers use common dual active groups (containing chloro-s-triazine and vinyl sulfone dual active groups) yellow, red and blue reactive dyes to fight coffee color when dyeing dark brown. There are certain differences among them in the affinity to fiber, the sensitivity of color uptake rate and fixation rate to saline and alkali, and the sensitivity to temperature solubility ratio. Therefore, the color reproducibility of the dyeing is poor, it is easy to cause color flowers, and the dyeing quality cannot be guaranteed, so it is required to produce a single-color brown reactive dye to ensure the dyeing quality