Method for preparing carmine reactive dye

Abstract

The invention discloses a method for preparing a carmine reactive dye. The method comprises the following steps of: 1, synthesizing sulfonated methyl J-acid sodium salt; 2, preparing sulfonated para-ester diazo; 3, keeping the sulfonated para-ester diazo obtained in step 2 and a reaction product in step 1 at the temperature of between 5 and 10 DEG C under acidic conditions, and condensing for 3 to 4 hours; 4, adding 31.1g of 2-[(3-amino-4-methoxyphenyl)sulphonyl]ethyl hydrogen sulfate at the concentration of 100 percent into 150g of ice and water mixture, beating for 1 hour, adding 30 percent hydrochloric acid, adding 6.9g of aqueous solution of 100 percent sodium nitrite, keeping the temperature at 5 to 8 DEG C, reacting for 2 hours when the solution is faint blue on starch potassium iodide paper, and removing an excess amount of nitrous acid by using a small amount of sulfamic acid; and 5, mixing a reaction solution in step 4 and an acidic coupling liquid in step 3, regulating the pH value to be 6 to 6.5 by using baking soda, and coupling at the temperature of between 10 and 15 DEG C for 3 to 4 hours to obtain the carmine reactive dye.

Description

technical field [0001] The invention relates to a preparation method of carmine reactive dye. Background technique [0002] Reactive dyes have outstanding features such as bright color, excellent application performance, easy use and strong applicability, etc., and have a large market demand. There are more and more requirements for the application indicators, and the dyeing rate, color fixing rate, washing fastness, and white cloth color fastness of the current dyes are relatively poor. Contents of the invention [0003] The invention provides a preparation method of carmine reactive dye, which not only has better dyeing rate and fixation rate, but also has better washing fastness and white cloth color fastness. [0004] The present invention has adopted following technical scheme: a kind of preparation method of carmine reactive dye, it comprises the following steps: step 1, the synthesis of sodium salt of sulfonated methyl J acid: add 50ml after dropping into sodium su...

AI Technical Summary

Problems solved by technology

[0002] Reactive dyes have outstanding features such as bright color, excellent application performance, easy use and strong applicability, etc., and have a large market demand. There are more and more requirements for application indicators, and the current dyeing rate, color fixation rate, washing fastness, and white cloth color fastness are relatively poor