Active bright blue KX is a dichlorotriazine active dye that gives cellulose a bright blue color with a reddish tint. Like other triazine active dyes , it is fixed in the process of interaction with the dye of the functional groups of the fiber (or other dyeable material) with the formation of a covalent bond .
Active bright blue KX does not differ in color characteristics from Active bright blue K , a monochlorotriazine dye of almost the same composition. Dichloro- from monochlorotriazine dyes are distinguished by milder krashenmy conditions, a greater affinity for the substrate, and a lower leveling ability.
Dichlorotriazine active dyes chemically interact with the substrate under mild conditions (“X” in the name means coloration from a “cold” bath). At 20-30 ° C, in the presence of an alkaline agent, in the hydroxy or amino group of the substance to be colored, the hydrogen atom is replaced by the dye residue, that is, instead of linking the triazine moiety of the dye to one of the chlorine atoms, a bond is formed with nitrogen or oxygen of the corresponding groups of the colored substrate (second a chlorine substituent may interact the same or hydrolyze).
Getting
Active bright blue KX is obtained by the interaction of bromamic acid and 2,4-diaminobenzenesulfonic acid , followed by acylation of the resulting product with cyanuric chloride .
The resulting bright blue CX active can be isolated, or can be treated with methanolic acid at 40 ° C with the gradual addition of a soda solution to maintain pH. Monochlorotriazine dye is formed. Active bright blue K.
Literature
- B. I. Stepanov "Introduction to the chemistry and technology of organic dyes", ed. 3rd, rev. and add., M., "Chemistry", 1984.