Preparation method of N-substituted pyridone pyridine quaternary ammonium salt monoazo dye

Abstract

Disclosed is a preparation method of an N-substituted pyridone pyridine quaternary ammonium salt monoazo dye, and the invention relates to a preparation method of a dye. The method comprises the following steps: a) diazotization, in which 0.02 mol of aromatic amine is taken and put into water, about 0.05 mol of concentrated hydrochloric acid is added, the reaction is controlled at a certain temperature, 0.02 mol of sodium nitrite is added, and continuous stirring is conducted for a while after the addition for preparing diazonium salt for later use; and b) coupling, in which 0.02 mol of N-substituted pyridone pyridine quaternary ammonium salt is taken and is added into the diazonium salt prepared in the step a for later use while the reaction temperature is maintained, stirring is conducted for a while after the drop addition is completed, the pH of an alkaline solution is adjusted, and a dye product is packed into a bottle for use. After the coupling is completed, the pH of a dye solution is adjusted to 3-6 for subsequent dying. The prepared pyridone pyridine azo dye can be directly applied for dying without purification and refining.

Description

technical field [0001] The invention relates to a method for preparing dyes, in particular to a method for preparing N-substituted pyridone-based pyridine quaternary ammonium salt monoazo dyes. Background technique [0002] Pyridone derivatives are dye intermediates, mainly used in the preparation of azo dyes. Pyridone azo dyes are important varieties of yellow, orange, and red tones, and have the characteristics of high color development strength, excellent dyeing performance, and high light fastness. Especially for printing and dyeing paper. [0003] In recent years, a large number of patents have been published and are being continuously improved to enrich the color spectrum of dyes and improve the application performance of dyes, such as C.I Disperse Yellow 103, 119, 125, 165, etc. This kind of compound is not only easy to prepare, but also has strong coupling ability, and the substituent on the 3-position can be replaced by -CN, -CONH 2 , -H, pyridine, etc., can synt...

AI Technical Summary

Problems solved by technology

The diazo components coupled with pyridone derivatives are mainly aniline series. Among the monoazo dyes containing pyridone structure, the diazo components containing electron-withdrawing groups are mostly light-colored varieties, which have better Light fastness; the diazo component contains electron-donating groups, which is beneficial to the dark color effect, but the light fastness is reduced

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