Bisazo solvent dye preparation method and uses

A solvent dye and disazo technology, which is applied in the field of preparation of disazo solvent dyes, can solve the problem of not being able to meet the requirements of inkjet applications, and achieve the effect of good stable solubility

Inactive Publication Date: 2004-11-17
HUBEI DINGLONG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The dyes synthesized by traditional methods cannot meet the requirements for inkjet applications at all

Method used

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  • Bisazo solvent dye preparation method and uses
  • Bisazo solvent dye preparation method and uses
  • Bisazo solvent dye preparation method and uses

Examples

Experimental program
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Effect test

Embodiment 1

[0021] 9.35 parts III(R 1 =H) Mix with 130 parts of water and 25 parts of concentrated hydrochloric acid, cool to 0°C with ice, add an aqueous solution containing 7.2 parts of sodium nitrite, and stir at 0-5°C for 1 hour.

[0022] Stir the mixture containing 15 parts of 1-naphthylamine, 300 parts of water and 12 parts of hydrochloric acid to 70-80°C until all the materials are dissolved. Then add ice and cool down to 20-30°C. Then add 21 parts of sodium acetate. Then add the diazonium reaction solution of III prepared above, and stir at about 10°C until the coupling reaction is completed. Then add 20-25% NaOH solution to adjust the reaction solution to make the phenolphthalein test paper change color. Filter and wash with water until neutral. A red IV wet cake was obtained. Purity by HPLC analysis was 85%.

[0023] After drying the wet cake of IV, add 120 parts of ethanol, stir at reflux temperature for 1 hour, cool down to 20-25°C, and filter. Add 400 parts of water to...

Embodiment 2

[0030] According to the method of embodiment 1, use R in the preparation of V 2 -CO-R 3 (R 2 =CH 3 , R 3 =CH 2 CH 3 ) is condensed with 1,8-diaminonaphthalene. The diazonium solution of IV and the acidic solution of V were mixed and stirred at 20°C for 0.5 hours until the reaction was complete. Preparation of I and II (R 1 = H, R 2 =CH 3 , R 3 =CH 2 CH 3 ) 43.8 parts of mixed solvent dyes.

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PUM

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Abstract

The invention relates to a process for preparing bisdiazo solvent dye which comprises, dissolving 1-naphthylamine into 0.5-5wt% of water solution of hydrochloric acid or sulfuric acid, charging sodium acetate till pH=3-4, charging diazonium salt of arylamine for coupling reaction at 0-15 deg. C, neutralizing the reaction mixture with alkali till pH=8-13, filtering, water scrubbing to obtain the monoazo dye, subjecting monoazo dye to diazo reaction with sodium nitrite, coupling the reacted mixture and 1, 8 di-naphthylamine with the condensation product of alkyl ketone R2-CO-R3, neutralizing the coupling product with alkali till pH=8-13, processing 90-100 minutes at 90-100 deg. C, filtering, rinshing to absence of chloride ion.

Description

technical field [0001] The invention relates to a preparation method and application of a disazo solvent dye. Background technique [0002] The traditional diazotization of arylamine is generally salted in strong acid (such as sulfuric acid, hydrochloric acid) aqueous solution, and then reacted with sodium nitrite. [0003] As an organic dye used in inkjet, it is very important that it has stable solubility in the organic solvent used in the ink, and neither condensation nor insoluble impurities can occur in the ink, otherwise the nozzle will be easily clogged. [0004] The ink used for inkjet recording has certain requirements on its viscosity. If the viscosity is high, it cannot be ejected from the ejection head, and it becomes droplets and splashes. In addition, the ink must have sufficient stability to prevent condensation in the ink cartridge or cause nozzle clogging. [0005] In addition, solvent dyes used as colorants for inkjet inks must have high tinting strength,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09B31/053C09D11/328
Inventor 左新举兰泽冠朱双全
Owner HUBEI DINGLONG CO LTD
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