Dark colored reactive dye with high fixation rate
A reactive dye and deep black technology, applied in organic dyes, dyeing methods, textiles and papermaking, etc., can solve problems affecting economic benefits, dye residues, and high chroma of dyeing residues
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Embodiment 1
[0051] Mix 0.1mol of para-ester (compound 01) and 0.15mol of hydrochloric acid, add 350g of ice-water mixture, beat for 30min, add 30% NaNO dropwise from the liquid surface at 0~5℃ 2 Solution 0.1mol, keep NaNO during dropwise addition and reaction 2 excess. After diazotization to the end point, excess NaNO 2 Destroy with sulfamic acid.
[0052] Add 0.1mol-amino-8-naphthol-3,6-disulfonic acid (H acid) solution to the above diazonium salt, and carry out acidic coupling at 5-8°C. After the reaction is completed, add 0.1 mol of 2.4-bis(β-hydroxyethylsulfonyl sulfate) aniline diazonium salt dropwise to the above-mentioned acidic coupling monoazo dye reaction solution, and maintain 10°C and PH6~6.5 to react to the end . The navy blue component dye 101 was obtained after membrane separation to remove salt and spray drying.
Embodiment 2
[0054] Add 15g of sodium methanesulfonate to 10% J acid solution (0.1mol), and react at below 50°C for 4 hours to obtain 2-sulfomethylamino-5-naphthol-7-sulfonic acid solution. Add 0.1 mol para-ester diazonium hydrochloric acid solution to the above coupling components, control pH ≤ 2, and couple at 0-5°C until the reaction is complete. Add 0.2mol para-ester diazonium salt solution dropwise to the above-mentioned primary coupling solution, and gradually increase the pH to 6-6.2 at room temperature until the reaction is complete. Salt out, dry and pulverize to get the yellow component dye 301.
Embodiment 4
[0056] 45 parts of dye (101), 15 parts of dye (202), 12 parts of dye (301) and 10 parts of naphthalenesulfonic acid formaldehyde condensate are mixed in a mixing tank as dry powder, or dissolved together and then spray-dried to obtain black dyed cotton as dark black. It has good dyeing performance and satisfactory color fastness.
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