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High-dissolvability acid yellow dye and preparation method thereof

A high-solubility, acid yellow technology, applied in the direction of organic dyes, azo dyes, monoazo dyes, etc., can solve the problem of solubility difference in water, etc., and achieve the effect of bright color and excellent solubility performance

Active Publication Date: 2015-12-23
杭州下沙恒升化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] They are isomers with almost the same color, but their solubility in water is very different

Method used

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  • High-dissolvability acid yellow dye and preparation method thereof
  • High-dissolvability acid yellow dye and preparation method thereof
  • High-dissolvability acid yellow dye and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Add 380kg of water to the diazo kettle, start stirring, add 451kg of zebane sulfanilic acid, then add 550kg of 25% sulfuric acid solution, then add 500kg of ice, and add 182kg of zebra sodium nitrite dropwise under slow liquid 30% aqueous solution, control the temperature T<20 °C, after the addition, the Congo red test paper and the starch-potassium iodide test paper are blue; continue to stir for 30 minutes, and remove excess sodium nitrite with a small amount of sulfamic acid.

[0031] The prepared diazonium m-aminobenzenesulfonic acid salt was put into the condensation kettle, and 490kg of dimethyl 2-acetylsuccinate melted liquid was metered and pumped, and about 350kg of ammonium bicarbonate was slowly added, and the temperature was controlled at 15-25 ℃ and PH<5.2 until the diazonium salt disappears.

[0032] Add 380kg of water to the diazo kettle, start stirring, add 451kg of zebra-sulfanilic acid, then add 570kg of 98% sulfuric acid, then add 500kg of ice, add 18...

Embodiment 2

[0036] Replace "the ammonium bicarbonate of about 350kg slowly" in "slowly adding about 370kg of sodium bicarbonate" in embodiment 1, and all the other are the same as embodiment 1 to get 2045kg of finished product.

Embodiment 3

[0038] Replace the "slowly sprinkle about 340kg of soda ash into the condensation liquid to adjust the pH to 7.8" in Example 1 with "slowly sprinkle about 330kg of ammonium carbonate into the condensation liquid, adjust the pH to 7.5", and implement the rest in the same way Example 1, get finished product 2052kg.

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Abstract

The invention relates to high-dissolvability acid yellow dye. The structural general formula [I] of the compound is shown in the specification. The preparation method mainly includes the steps that metanilic acid [I] reacts with sodium nitrite in inorganic acid media to obtain diazonium salt; then 2-dimethyl acetylsuccinate (for short, DMAS) is added into the diazonium salt, acid-binding agents are added for condensation until the diazonium salt disappears, and alkali is added to adjust the pH value until alkalescence is achieved; sulfanilic acid reacts with sodium nutrite in inorganic acid media to obtain diazonium salt, the diazonium salt is coupled with condensation liquid, alkali is added into coupling liquor, the mixture is heated for hydrolysis, and then spraying drying is performed to obtain the finished product. The high-dissolvability acid yellow dye has the advantages that a one-pot method is adopted, no wastewater is discharged in the method, and pollution to the environment will not be caused; the obtained acid yellow dye is excellent in dissolvability.

Description

technical field [0001] The invention relates to an acid yellow dye, in particular to a highly soluble acid yellow dye and a preparation method thereof. Background technique [0002] Acid dyes are a kind of water-soluble dyes with sulfonic acid groups or carboxylic acid groups in their structure. Acid dyes are mainly used for dyeing and printing of wool, silk and other protein fibers and polyamide fibers. They can also be used for paper, leather, ink, Daily chemical products, agricultural chemical products (pesticides, fertilizers, seeds), some varieties are also used as food coloring or coloring for food, medicine, cosmetics, etc. [0003] So far, nearly 300 varieties of acid yellow dyes have been developed, but no acid yellow has a water solubility (25°C) of more than 500g / L. Among the red and blue series of acid dyes, there are acid scarlet 3R, Acid brilliant blue FCF and other dyes can reach 500g / L. Due to the lack of high-solubility acid yellow varieties, it is impossi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09B29/46
Inventor 孙凤龙谢迎伟吴志彤
Owner 杭州下沙恒升化工有限公司
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