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Preparation method of cation bright yellow 7GL

A cationic bright yellow and reactive technology, applied in organic chemistry, organic dyes, etc., can solve the problems of human hazards, environmental pollution, low yield, etc., achieve the effects of reducing sewage discharge, optimizing the ratio of feeding materials, and improving product yield

Active Publication Date: 2015-03-11
刘晨义
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Problems solved by technology

[0024] The invention provides a preparation method of cationic bright yellow 7GL, which solves the problems of low yield, harm to human body, serious environmental pollution and the like in the existing preparation method of cationic bright yellow 7GL

Method used

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  • Preparation method of cation bright yellow 7GL
  • Preparation method of cation bright yellow 7GL
  • Preparation method of cation bright yellow 7GL

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Embodiment Construction

[0052] The technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention. Apparently, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0053] A preparation method of cationic bright yellow 7GL, comprising the steps of:

[0054] (1) The synthesis of 3-methylbenzothiazole hydrazone comprises the following steps:

[0055] A Methylation: Take 2-aminobenzothiazole, dichloroethane, and catalyst 1, stir and beat, add dimethyl sulfate at 30-35°C, add the total time for 60-100 minutes, and then heat up to 60-70°C ℃ for 1-2 hours to react to the end point, then add water to raise the temperature to recover dichloroethane, recover to 90...

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Abstract

The invention relates to a preparation method of cation bright yellow 7GL. The method comprises the following steps: (1) synthetizing 3-ethyl thiazole truxene hydrazone: A) methylation: taking 2-aminobenzothiazole, dichloroethane and a catalyst I, stirring and mashing the aminobenzothiazole, the dichloroethane and the catalyst I, adding dimethyl sulphate to the mixture at 30-35 DEG C, wherein the total adding time is 60-100 minutes, then, carrying out heating till the temperature is 60-70 DEG C, carrying out reaction for 1-2 hours to the end, adding water, carrying out heating for temperature rise and recovering dichloroethane, recovering to 90 DEG C, finishing the recovery of the dichloroethane so as to obtain a water solution containing an intermediate as shown in the formula 1; B contracting and mixing: in a solution of the intermediate as shown in in the formula 1, firstly adding the catalyst II, regulating the pH to be 2-4, then adding hydrazine hydrate to reach 98-99 DEG C, carrying out reaction for 4-5 hours, after reaction, lowering the temperature, performing filtration so as to obtain the 3-ethyl thiazole truxene hydrazone containing an intermediate as shown in the formula 2; (2) synthetizing 2-chlorine methyl imidazole truxene; (3) synthetizing a dye. The preparation method disclosed by the invention is high in yield, low in expense, environment-friendly and zero in pollution.

Description

technical field [0001] The invention relates to a preparation method of a dye, in particular to a preparation method of cationic bright yellow 7GL. Background technique [0002] Cationic Bright Yellow 7GL (Basic Yellow 24) belongs to a kind of cationic dyes, which is a kind of textile dyes, also known as basic dyes and salt-based dyes. Soluble in water, it is in cationic state, mainly used for dyeing acrylic fiber. It can also be combined with protein molecules with salt and alkali. Cationic dyes are soluble in water and ionized in aqueous solution to generate dyes with positively charged colored ions. The cation of the dye can combine with the acid group of the third monomer in the fabric to dye the fiber. It is a special dye for acrylic fiber dyeing. It has the advantages of high strength, bright color and good light fastness. [0003] At present, the flow chart of the usual preparation method of Cationic Bright Yellow 7GL is as follows: [0004] 1) Synthesis of 3-meth...

Claims

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Application Information

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IPC IPC(8): C09B69/06C07D417/12
Inventor 刘晨义员海峡刘仁义师阿丽
Owner 刘晨义
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