Preparation method for reaction red dye

Abstract

The invention relates to a preparation method for a reaction red dye. The preparation method comprises the following steps: adding cyanuric chloride into ice water, and carrying out pulping treatmentso as to obtain a pulped solution; adding solid para-ester into the pulped solution, continuing adding a mixed alkaline solution so as to regulate alkalinity, and carrying out a condensation reactionso as to obtain a first condensate, wherein the mixed alkaline is sodium carbonate and baking soda; adding solid J acid into the first condensate, and carrying out a condensation reaction so as to obtain a second condensate; continuing adding solid H acid into the second condensate, and carrying out a condensation reaction so as to obtain a mixed second condensate, wherein the mol ratio of the solid J acid to the solid H acid is (0.65-0.68): (0.32-0.35); adding hydrochloric acid and sodium nitrite into sulfonated tobias acid, and carrying out a diazotization reaction so as to obtain sulfonatedtobias acid diazotized salt; and adding the sulfonated tobias acid diazotized salt into the mixed second condensate, carrying out a coupling reaction, and carrying out post-treatment so as to obtainthe reaction red dye. The preparation method provided by the invention is convenient and rapid, occupies few resources, has low energy consumption, and facilitates color matching.

Description

technical field [0001] The invention relates to the field of reactive dye preparation, in particular to a preparation method of reactive scarlet dye. Background technique [0002] Reactive dyes, also known as reactive dyes, are a class of dyes that chemically react with fibers during dyeing. This type of dye molecule contains groups that can react chemically with the fiber. When dyeing, the dye reacts with the fiber and forms a covalent bond between the two to form a whole, which improves the fastness to washing and rubbing. [0003] Most of the water-soluble scarlet dyes currently on the market are compounded by the traditional method of reactive red 3B and orange 2R, in which the following red dye (formula Ⅰ) and orange dye (formula Ⅱ) are compounded with scarlet reactive dye The most widely used in , the structural formula is as follows: [0004] [0005] The traditional and conventional compounding method is to synthesize red and orange dyes separately, spray dry th...

AI Technical Summary

Problems solved by technology

[0006] At present, in the process of producing reactive scarlet dyes, the production of red dyes and orange dyes alone has the problems of occupying a lot of resources, large energy consumption, and difficult toning in the compounding stage.

Images