Bright red reactive dye and application thereof
A technology of reactive dyes and dyes, applied in the field of bright red reactive dyes and its applications, can solve the problems of low water solubility of orange, unsatisfactory color fastness, unsatisfactory color fixation rate and level dyeing property, etc. Good color fixing ability, stable and direct effect
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[0044] The preparation method of formula (3) dyestuff comprises the steps:
[0045] 1) Beat 2-amino-4-acetylaminobenzenesulfonic acid, adjust the pH to 7.0 with liquid caustic soda until dissolved, and set aside;
[0046] 2) Add water and ice to para-ester, hydrochloric acid and beat for 30 minutes, add 30% sodium nitrite aqueous solution, maintain temperature T=0-5°C, and use sulfamic acid to eliminate excess sodium nitrite after reacting for 1 hour; when starch potassium iodide The test paper is colorless, the Congo red test paper is blue, and when the end point is reached, the diazo solution is obtained;
[0047] 3) Add the diazonium solution prepared in step 2) to the 2-amino-4-acetamidobenzenesulfonic acid solution prepared in step 1), adjust pH=7.0-7.5, maintain temperature T=8-15°C, After 6 hours of reaction, the end point is reached, and the coupling solution is obtained; the coupling solution is filtered to remove insoluble matter, and spray-dried to obtain the dye o...
Embodiment 1
[0049] 50g of the dye of formula (1-1), 20g of the dye of formula (2-1) and 30g of the dye of formula (3) were fully mechanically mixed to obtain the scarlet reactive dye of this embodiment.
[0050]Take 4g of the scarlet reactive dye prepared above with an appropriate amount of water to fully dissolve it, then set the volume in a 500ml volumetric flask, draw 10ml of the dye solution and mix it with 50ml of water, then add 4g of cotton cloth, 1.8g of sodium sulfate, and 0.4g of DG- 170, then raise the temperature to 60°C at a rate of 1°C / min, keep it for 30 minutes, add 1g of sodium carbonate, keep it at 60°C for 30 minutes, then take out the dyed cotton cloth and boil it with non-ionic detergent boiling soap for 15 minutes Minutes, then wash with water and dry at about 70 ℃, the dye can dye the cotton cloth into red with deep color, good level dyeing, good reproducibility and good color fastness.
Embodiment 2
[0052] The aqueous solution containing 50g formula (1-2) dyestuff, the aqueous solution containing 20g formula (2-1) dyestuff and the aqueous solution containing 30g formula (3) dyestuff obtain the scarlet reactive dye of the present embodiment through fully mechanical mixing.
[0053] Take 4g of the scarlet reactive dye prepared above and dissolve it fully with an appropriate amount of water, then set the volume in a 500ml volumetric flask, draw 10ml of the dye solution and mix it with 50ml of water, then add 4g of cotton cloth, 1.8g of sodium sulfate, and 0.4g of DG -170, then raise the temperature to 60°C at a rate of 1°C / min, keep it for 30 minutes, add 1g of sodium carbonate, keep it at 60°C for 30 minutes, then take out the dyed cotton cloth and boil it with non-ionic detergent boiling soap After 15 minutes, wash with water and dry at about 70°C. This dye can dye cotton cloth into red with deep color, good level dyeing, good reproducibility and good color fastness.
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