Synthesis method of active orange dye

Abstract

The invention relates to a synthesis method of an active orange dye. The method comprises the following steps of (1) adding ice and a dispersing agent to cyanuric chloride, pulping to form cyanuric chloride slurry, dropwise adding a para-ester aqueous solution to the cyanuric chloride slurry and carrying out primary condensation reaction to obtain primarily concentrated liquid; (2) adding a sulfonated J acid to the primarily concentrated liquid obtained in the step (1), carrying out secondary condensation reaction to obtain a secondarily concentrated liquid; (3) pulping a sulfonated tobias acid, adding sodium nitrite and hydrochloric acid for diazo-reaction to obtain a diazo liquid; and (4) adding the diazo liquid obtained in the step (3) to the secondarily concentrated liquid obtained in the step (2) for coupling reaction, maintaining the pH value between 6.3 and 6.8 in the coupling process, carrying out spray drying after complete reaction to obtain the active orange dye. The synthesis method is simple in operation procedure, and the synthesized product dye is vivid in color light and high in solubility.

Description

technical field [0001] The invention relates to the field of dye synthesis, in particular to a method for synthesizing reactive orange dyes. Background technique [0002] Reactive dyes are a kind of reactive dyes that can form covalent bonds with fibers through chemical reaction. In recent years, with the continuous improvement of people's living standards, the continuous enhancement of health awareness, and the improvement of people's requirements for the quality and category of dyed fabrics, natural fibers such as cotton, hemp, and silk are more favored, and the main dye varieties for dyeing these natural fibers are It is reactive dyes that make reactive dyes one of the most important dye classes today. [0003] Reactive orange is an indispensable dye in reactive printing dyes. Chinese invention patent (CN 105860580 A) discloses a preparation method of orange reactive dye, comprising the following steps: beating cyanuric chloride, adding m-sulfanilic acid dropwise to the...

AI Technical Summary

Problems solved by technology

[0004] The powdery orange reactive dye that above-mentioned preparation method obtains has following defect: the orange dye that synthesis obtains is a K-type dyestuff, can only be used for printing, and can not be used for the larger exhaust dyeing of market; Secondly, the orange dye that synthesis obtains The solubility of the dye is low, usually the solid content of 15-17% has been precipitated when the synthesis is completed, and it is in a jelly state. In order to be spray-dried, the synthesized orange dye must be stored at high temperature

In addition, although the J acid has been refined to remove the r acid in the J acid that makes the orange dye dark, the small amount of J acid remaining in the bicondensation reaction will still undergo a double coupling reaction during coupling, so that the generated disazo dye is relatively It is a darker red dye, so the shade of orange dye produced by patent CN 105860580 A will be relatively dark

Images