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Red reactive dyestuffs and preparation method thereof

A technology of reactive dyes and red, applied in the field of red reactive dyes and its preparation, to achieve the effects of bright and beautiful shades, promotion of environmental protection, high exhaustion rate and color fixation rate

Active Publication Date: 2008-07-09
TIANJIN DEK CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Acid dyes can no longer meet the development of the times

Method used

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  • Red reactive dyestuffs and preparation method thereof
  • Red reactive dyestuffs and preparation method thereof
  • Red reactive dyestuffs and preparation method thereof

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preparation example Construction

[0036] A preparation method for red reactive dyes, comprising the steps of:

[0037] a. 2.4-sodium diaminobenzenesulfonate is subjected to condensation reaction and diazotization reaction to prepare m-diactivator diazonium solution;

[0038] b. Activation reaction: add H acid in water, under stirring, add acid-binding agent, adjust pH=6.5-7, dissolve the material, clarify, the mass percentage concentration of the solution is 15-16%, directly add ice to cool down, adjust the volume, Make the mass percent concentration of the solution 10%, adjust the temperature to 5-7°C, add halopropionyl chloride dropwise, and react at pH=6-6.5;

[0039] c. Coupling reaction: use sulfamic acid to eliminate the excess nitrous acid in step a, then add the solution to step b along with the acid-binding agent, control the pH of the solution to 7, maintain the temperature at 15-20°C, and maintain the pH to 7 -7.5, the reaction time is 2.5-3 hours;

[0040] d. Remove insoluble matter: adjust the r...

Embodiment 1

[0050] 1. Ingredients list:

[0051] raw material name

[0052] 2, dyestuff preparation technology of the present invention operates as follows:

[0053] a. Dissolution of sodium 2,4-diaminobenzenesulfonate

[0054] Put 2400 liters of bottom water in the reaction tank, add 288.75 kg of sodium 2,4-diaminobenzenesulfonate, heat up to 22°C, stir and dissolve, so that the materials are completely dissolved and clarified. Adjust the pH to 6-6.5 with dilute hydrochloric acid. The volume is 2625 liters, and C%=11 in the solution (referring to mass percent concentration, the same below).

[0055] b. Condensation reaction

[0056]Use direct ice and jacketed circulating cold water to adjust the temperature of solution a to 0-5°C, adjust the C% in the solution to 10, add 2,3-dibromopropionyl chloride within 1.5-2 hours, and maintain it with sodium bicarbonate at the same time pH=6~6.5, stirred and reacted for 2 hours. The reaction temperature is 0-5°C, and the reaction pH...

Embodiment 2

[0086] a. Dissolution of sodium 2,4-diaminobenzenesulfonate

[0087] Put 2400 liters of bottom water in the reaction tank, add 288.75 kg of sodium 2,4-diaminobenzenesulfonate, heat up to 22°C, stir and dissolve, so that the materials are completely dissolved and clarified. Adjust the pH to 6-6.5 with dilute hydrochloric acid. The volume is 2625 liters, C%=11 in the solution.

[0088] b. Condensation reaction

[0089] Use direct ice and jacketed circulating cold water to adjust the temperature of solution a to 0-5°C, adjust the C% in the solution to 10, add 2,3-dibromopropionyl chloride within 1.5-2 hours, and maintain it with sodium bicarbonate at the same time pH=6~6.5, stirred and reacted for 2 hours. The reaction temperature is 0-5°C, and the reaction pH is 6-6.5. Finally, the end point was detected by TLC aluminum-based silica gel thin-layer plate.

[0090] c, diazotization reaction

[0091] Quantitative 30% hydrochloric acid solution was added to the condensation li...

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Abstract

The invention discloses a red reactive dye and a process for preparation, which utilizes 2, 4-diamino benzene sulfonate, H-acid and 2, 3-dibromo propionyl chlorine to be main raw material. The process for preparation comprises condensing, diazotizing, activating, coupling, adding auxiliary agent, improving dye strength, adjusting color cast, adjusting intensity, drying and packing. The red reactive dyes which is got by the invention has higher reactivity, excellent dissolvability brilliant and attractive color cast, great light fastness properties and high adsorbability and fixation yield. The front blending and mixing technique after adding auxiliary agent and handling film can avoid producing water and waste slag, which plays a great promoting effect to environment.

Description

technical field [0001] The invention relates to a reactive dye and a preparation method thereof, especially a red reactive dye and a preparation method thereof. Background technique [0002] Now generally dyeing wool and cashmere, the dyes used are acid dyes, acid mordant dyes and metal complex dyes. Because the materials dyed with these types of dyes have poor fastness, the shade is not very bright, and it will cause troubles to the environment. In the 21st century, due to environmental and ecological constraints, the requirements for color uptake rate, color fixation rate and dyeing wastewater are getting higher and higher. Acid dyes can no longer meet the development of the times. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a red reactive dye and its preparation method that can reduce environmental pollution, require low cost of raw materials, high product solubility, bright color, excellent application ...

Claims

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Application Information

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IPC IPC(8): C09B62/008
Inventor 张兴华苏长湘
Owner TIANJIN DEK CHEM
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