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Migration-resistant red dye, preparation method therefor and application thereof

A red dye, migration-resistant technology, used in azo dyes, organic dyes, chemical instruments and methods, etc., can solve the problems of high cost and troublesome preparation methods, and achieve the effects of good compatibility, difficult procurement and low price

Active Publication Date: 2016-03-09
GUANGZHOU WEIQING CHEM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this preparation method is cumbersome and expensive
[0004] In addition, 2-amino-5-nitrophenol (CAS: 121-88-0), 2-aminophenol-4-sulfonamide (CAS: 98-32-8), 3-(4,5- Dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl)benzenesulfonamide (CAS: 89-29-2) and other substances to prepare azo dyes are rarely reported

Method used

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  • Migration-resistant red dye, preparation method therefor and application thereof
  • Migration-resistant red dye, preparation method therefor and application thereof

Examples

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Effect test

Embodiment 1

[0035] The preparation method of anti-migration red dye comprises the following steps:

[0036] (a) Diazo reaction

[0037] a1) Add 2-amino-5-nitrophenol and 2-aminophenol-4-sulfonamide into water, add liquid caustic soda with a mass fraction of 30% while stirring, maintain the liquid pH=12.5-13, and stir until 2- Amino-5-nitrophenol, 2-aminophenol-4-sulfonamide are completely dissolved; in this step, the mass ratio of the quality of water to 2-amino-5-nitrophenol is 113:1;

[0038] a2) Mix 25% sodium nitrite aqueous solution and 30% hydrochloric acid in mass fraction to obtain a mixed solution, cool to 0-5° C., at this temperature, add the solution obtained in step a1) dropwise to the mixed solution, and The diazotization reaction is carried out at 0-5°C to obtain the diazo product; the dropping time is 1-2 hours; the dropping method is used to keep the temperature at 0-5°C, reduce the occurrence of side reactions, and at the same time , the dropping time should not be too ...

Embodiment 2

[0046] The preparation method of anti-migration red dye comprises the following steps:

[0047] (a) Diazo reaction

[0048] a1) Add 2-amino-5-nitrophenol and 2-aminophenol-4-sulfonamide into water, add liquid caustic soda with a mass fraction of 30% while stirring, maintain the liquid pH=12.5-13, and stir until 2- Amino-5-nitrophenol, 2-aminophenol-4-sulfonamide are completely dissolved; the mass ratio of water to 2-amino-5-nitrophenol in this step is 100:1;

[0049] a2) Mix 20% sodium nitrite aqueous solution and 30% hydrochloric acid in mass fraction to obtain a mixed solution, cool to 0-5° C., at this temperature, add the solution obtained in step a1) dropwise to the mixed solution, and The diazotization reaction is carried out at 0-5°C to obtain the diazo product; the dropping time is 1-2 hours; the dropping method is used to keep the temperature at 0-5°C, reduce the occurrence of side reactions, and at the same time , the dropping time should not be too long, and side r...

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Abstract

The present invention relates to a migration-resistant red dye, a preparation method therefor and application thereof. The preparation method for the dye comprises the following steps: (a) mixing 2-amino-5-nitrophenol, 2-aminophenol-4-sulfamide, sodium nitrite, hydrochloric acid and water to react, and obtaining a diazonium product; (b) adding a mixed solution of 3-(4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl) benzenesulfonamide, caustic soda liquid and water to a vessel to react with the resulting diazonium product in the step (a), and obtaining a coupling product; (c) performing chromium complexation on basic chromium sulfate and the resulting coupling product in the step (b); (d) reacting a product obtained from the chromium complexation with a mixed solution of formic acid, n-tridecyl amine and water; and (e) after completion of the reaction, filtering and drying. The dye is resistant to a high temperature, is relatively inexpensive, and has good migration resistance.

Description

technical field [0001] The invention relates to a migration-resistant red dye, a preparation method and application. Background technique [0002] At present, azo dyes are widely used in industry. They are dyes containing one or more azo chromophores in their molecules. However, in the application of azo dyes, there are still technical problems such as low temperature resistance, high price, and insufficient migration resistance. [0003] The invention patent of CN102516795A discloses a preparation method of blue dye, including two diazotization reactions, mixing the first diazonium product with 1-naphthol-5-sulfonic acid solution and butanone for the first coupling, Then the second diazonium product is reacted with N, N-diethyl-m-hydroxyaniline to obtain the second coupling product, the first coupling product is carried out complex reaction with chromating reagent to obtain the first complex product, and the The first complexation product is mixed with the second coupling...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09B45/01C09D7/12C09D161/20
CPCC09B45/01C09D7/41C09D161/20
Inventor 汪国伟
Owner GUANGZHOU WEIQING CHEM TECH CO LTD
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