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A red light blue azo disperse dye with high color intensity and preparation method thereof
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A technology of disperse dyes and strength, applied in the direction of azo dyes, monoazo dyes, luminescent materials, etc., can solve the problems of dyeing temperature difference and brightness difference, and achieve the effect of close color, simple method and cost saving
Active Publication Date: 2018-04-06
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 diazonium solution
[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 dropped 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, evenly and slowly add mixed acid (mixed acid is 5 parts by weight of concentrated sulfuric acid and 1.85 parts of 98% nitric acid), and then add Incubate at an acid temperature for 1 hour, and sample and chromatographically analyze that the raw material content is less than 1%. Then add 1 part of activated carbon, stir for 20 minutes, filter, and the quantitative analysis yield is 95%. The mother liquor is stored at low temperature until use.
[0050] Slowly add 15 parts of propionic acid to the 2-amino-3-acetyl-5-nitrothiophene sulfuric acid solution synthesized above at -5°C-0°C, ...
Embodiment 2
[0051] Embodiment 2: the 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) were mixed to obtain a coupling solution. Under a good stirring state, slowly add the obtained diazo component solution into 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 structural formula is as follows:
[0053]
Embodiment 3
[0054] Example 3: Synthesis of Dye B
[0055] The difference from Example 2 is: 3-methyl-N-ethyl-N-(ethoxycarbonylpropyl) aniline in the above-mentioned coupling solution is replaced by 3-methyl-N-ethyl-N-( Propoxycarbonyl propyl) aniline (M263, 7.57 parts), other charging capacity and operation are constant, 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 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 disperse dye blue in the printing and dyeing industry. Its synthetic process route is long, the three wastes are many, and it is difficult to manage, 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. Increased cost and sewage treatment problems. 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 existing disperse dye products, disperse blue 165:1, disperse...
Claims
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