Reactive printing dye and its aqueous composition application
The present invention relates to a reactive printing dye composition, which includes: (a) at least one reactive dye; (b) an organic buffer; and (c) a mirabilite or a dispersant. The reactive printing dye composition of the present invention is capable for being used in the fabric-dyeing, for example, dyeing of cotton, hemp, silk, rayon, wool, blending, etc. The reactive printing dye composition of the present invention is advantageous in high pH value stability, high storage stability, and reduced degradation in dyeing strength. In addition, the present invention further provides an aqueous reactive printing dye composition.
1. A reactive printing dye composition for cellulose fiber containing fabric, comprising:
(a) at least one reactive dye in an amount of 70.0 to 97.8 wt %;
(b) an organic buffer which is N-bis(2-hydroxyethyl)-2-aminoethanesulfonic acid or a salt thereof in an amount of 1.3 to 4.0 wt %; and
(c) a mirabilite (sodium sulfate) or a dispersant in an amount of 0.1 to 23 wt %,
wherein the component (a) is a reactive dye as shown in any one of the following formulas (I-1) to (I-15), its combination or its salt,
and wherein said dispersant comprises a sodium salt of beta-naphthalene sulfonic acid formaldehyde condensate.
2. The reactive printing dye composition as claimed in claim 1 , applied to a cotton twill fabric.