Method for preparing reactive brilliant blue 3G for wool

Abstract

The invention provides a method for preparing reactive brilliant blue 3G for wool. The method comprises the following steps of: (1) condensing bromamine acid and p-amine acetanilide under the action of a catalyst, and acidifying to obtain a condensation product; (2) sulfonating the condensation product by using fuming sulfuric acid, and performing basic hydrolysis to remove acetyl; and (3) condensing a hydrolysis product with 2,3-dibromo propionyl chloride, and performing debromination to prepare a reactive brilliant blue 3G dye. The preparation method provided by the invention is low in cost, energy consumption and pollution, and is suitable for industrial large-scale production. Various application performance indexes of the reactive brilliant blue 3G for wool, which is obtained by the preparation method provided by the invention, reach or exceed those of products of foreign companies.

Description

technical field

[0001] The invention belongs to the field of fine chemicals, and relates to a research on a method for preparing reactive dyes, in particular to a method for preparing reactive brilliant blue 3G for wool. Background technique

[0002] In 1966, Ciba Company launched Lanasol series of reactive dyes for wool. Among the Lanasol series of reactive dyes, Lanasol Blue 3G is one of the blue varieties, which is called Reactive Brilliant Blue 3G for wool in the domestic market. The structural formula is as follows:

[0003]

[0004] Brilliant blue 3G reactive dyes for wool can be used for dyeing and printing of protein fiber materials, such as dyeing and printing of wool, cashmere, silk and other fibers, and can also be used for loose wool, wool tops, yarns, carpets, fabrics and Dyeing and printing of woven fabrics. After dyeing wool, silk and other fibers with reactive brilliant blue 3G dyes, it will show a bright blue color, with extremely high color fixation ra...

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