A kind of red reactive dye for wool and preparation method thereof
A reactive dye for wool and reactive dye technology, applied in the field of red reactive dye for wool and its preparation, can solve the problems that cannot meet the needs of wool dyeing, high concentration of dyeing waste liquid, not very bright shade, etc., and achieve bright color , low cost of raw materials, and strong practicability
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Embodiment 1
[0060] A preparation method of red reactive dye for wool, comprising the steps of:
[0061] a, K acid diazotization
[0062] Add water and 19.2g of K acid to the reaction kettle, stir evenly, add crushed ice, 30% hydrochloric acid solution and 30% sodium nitrite aqueous solution, make the reaction solution at a temperature of 0-5°C, pH<2, and the starch potassium iodide test paper will be soaked. Under slightly blue conditions, after reacting for 2 hours, use sulfamic acid to eliminate excess nitrous acid to obtain diazonium salt of K acid, to be coupled;
[0063] b, H acid aqueous solution preparation
[0064] Add 17 g of H-acid solid material into the reaction kettle, add water, adjust the pH to about 7 with 30% NaOH aqueous solution, and completely dissolve the H-acid to obtain an H-acid aqueous solution, which is to be coupled;
[0065] c. Coupling reaction:
[0066] Slowly add the diazonium salt of K acid prepared in step a to the aqueous solution of acid H prepared in...
Embodiment 2
[0079] A preparation method of red reactive dye for wool, comprising the steps of:
[0080] a, K acid diazotization
[0081] Add water and 19.2g of K acid to the reaction kettle, stir evenly, add crushed ice, 30% hydrochloric acid solution and 30% sodium nitrite aqueous solution, make the reaction solution at a temperature of 0-5°C, pH<2, and the starch potassium iodide test paper will be soaked. Under slightly blue conditions, after reacting for 2 hours, use sulfamic acid to eliminate excess nitrous acid to obtain diazonium salt of K acid, to be coupled;
[0082] b, H acid aqueous solution preparation
[0083] Add 17 g of H-acid solid material into the reaction kettle, add water, adjust the pH to about 7 with 30% NaOH aqueous solution, and completely dissolve the H-acid to obtain an H-acid aqueous solution, which is to be coupled;
[0084] c. Coupling reaction:
[0085] Slowly add the diazonium salt of K acid prepared in step a to the aqueous solution of acid H prepared in...
Embodiment 3
[0098] A preparation method of red reactive dye for wool, comprising the steps of:
[0099] a, H acid aqueous solution preparation
[0100] Add 17g of H-acid solid material into the reaction kettle, add water, adjust the pH to about 7 with 30% NaOH aqueous solution, and completely dissolve the H-acid to obtain an H-acid aqueous solution to be condensed.
[0101] b. Condensation reaction:
[0102] b-1: Preparation of condensate: Weigh 12.82 g of propionyl bromide and 1.3 g of acetone to disperse the propionyl bromide evenly in the acetone to obtain a mixture of propionyl bromide and acetone for condensation;
[0103] b-2: Cool the aqueous solution of acid H in step a to 0-10°C, add dropwise the mixed solution of bromopropionyl chloride and acetone prepared in step b-1, and use Na 2 CO 3 Keep pH = 4-6, react for 4 hours, no H acid detected by TLC is the end point of the reaction, and a condensate is obtained, which is to be coupled.
[0104] c, K acid diazotization
[0105]...
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