Red-light blue azo disperse dye with high color development strength and preparation method therefor
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A technology of disperse dyes and strength, applied in azo dyes, monoazo dyes, luminescent materials, etc., can solve the problems of different brightness and dyeing temperature, and achieve the effect of close color, low cost and improved efficiency
Active Publication Date: 2016-01-13
浙江正裕化学工业有限公司 +1
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They have higher color intensity and better performance in various applications. However, compared with Disperse Blue 56, they have different vividness and dyeing temperature. They can only be used as a supplement to blue, and cannot replace Disperse Blue 56 as the main color. status
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Embodiment 1
[0048] Example 1: Synthesis of 2-amino-3-acetyl-5-nitrothiophene diazo liquid
[0049] In parts by weight, 2-amino-3-acetylthiophene (M141, 4.23 parts) was slowly added to 34 parts of concentrated sulfuric acid whose temperature had been lowered to -15°C, and stirred for 30 minutes to fully dissolve. At the same time, under good stirring conditions, within 2 hours at a temperature of -15 ° C - 10 ° C, the mixed acid (mixed acid is 5 parts by weight of concentrated sulfuric acid and 1.85 parts of 98% nitric acid) is uniformly and slowly added dropwise, and then add The acid temperature was kept for 1 hour, and the content of the raw materials was less than 1% by sampling and chromatographic analysis. Then, 1 part of activated carbon was added, stirred for 20 minutes, filtered, and the yield of quantitative analysis was 95%. The mother liquor was stored at low temperature for use.
[0050] The 2-amino-3-acetyl-5-nitrothiophene sulfuric acid solution synthesized above was slowly...
Embodiment 2
[0051] Example 2: Synthesis of Dye A
[0052] Coupling components 3-methyl-N-ethyl-N-(ethoxycarbonylpropyl)aniline (M249, 7.45 parts), acetone (30 parts), ice-water mixture (200 parts) and sulfamic acid (0.5 parts) and mixed to obtain a coupling solution. Under a good stirring state, slowly add the above-obtained diazo component solution to the coupling solution, maintain the temperature at 0° C. for 1 hour, filter, wash with water, and dry to obtain dye A (M431, 9.25 parts, yield 75%) The structure is as follows:
[0053]
Embodiment 3
[0054] Example 3: Synthesis of Dye B
[0055] The difference with Example 2 is: replace 3-methyl-N-ethyl-N-(ethoxycarbonylpropyl)aniline with 3-methyl-N-ethyl-N-( Propoxycarbonyl propyl) aniline (M263, 7.57 parts), other charging amounts and operation remain unchanged, obtain dyestuff B (M443, 11.3 parts, yield 90%) structural formula is as follows:
[0056]
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Abstract
The invention relates to textile dyes and particularly relates to a red-light blue azo disperse dye with high color development strength and a preparation method therefor. The disperse dye has a structure represented by a formula I shown in the description and is prepared through the steps: carrying out salt forming on 2-amino-3-acetyl thiophene in concentrated sulfuric acid, carrying out nitration reaction at the temperature of -20 to 0 DEG C so as to obtain a nitration product 2-amino-3-acetyl-5-nitrothiophene, then, adding activated carbon to the nitration product for adsorption, carrying out filtration, then, adding propanoic acid into the filtrate, then, dropwise adding nitrosyl sulfuric acid into the filtrate at the temperature of -15 to 0 DEG C, and carrying out diazotation, so as to obtain a diazotized solution; and dripping the obtained diazotized solution into a coupling component dispersed in ice water at the temperature of -5 to 0 DEG C, then, maintaining the temperature for 1-2 hours, carrying out filtration, and carrying out water washing, thereby obtaining the disperse dye represented by the formula I shown in the description. The dye prepared by the method is high in color development strength, bright-colored in color light and good in application performance. The dye has the advantages that the economical efficiency is obvious, few waste gases, waste water and waste residues are generated during preparation, and the like.
Description
technical field [0001] The invention relates to a textile dye, in particular to a red light blue azo disperse dye with high color development intensity and a preparation method thereof. Background technique [0002] C.I. Disperse Blue 56 is a bright red light blue disperse dye. It is a widely used main color dye for blue disperse dyes in the printing and dyeing industry. Its chemical structure type is substituted anthraquinone type. Its synthetic process route is long, the three wastes are many, and it is difficult to treat, which is the main problem that plagues the dye; on the other hand, similar to other anthraquinone dyes, the coloring strength is not high, and the lifting power is poor, especially when dyeing dark colors. Sewage treatment issues. In recent years, with the continuous improvement of environmental protection requirements, the development of new dyes to replace disperse blue 56 has become a topic of great practical significance. [0003] Among the existin...
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