The characteristics of cotton fabric with reactive dyes printing color bleeding

For pure cotton fabric with different color bleeding printed, pure bleeding effect is not enough, still need to have two kinds of dyes can be effectively separated, namely liquid chromatography gel in the sieving effect.In the bleed printing process, first of all to make the paste release enough water; second, must choose to extravasation and not extravasation in two kinds of dyes.

The effect of different permeable factors are:

(1)   the screening effect of paste,gel.

The paste precipitation water release, not to dye color bleeding effects, and paste gel water release can be heterochromatic infiltration effect. The synthetic tragacanth and corresponding gel reagent B salt for the reactive dye color permeability is better.

(2)    apply dye

In ooze color printing, the diffusion velocity in the gel as permeability good dye the sooner the better; As stranded color dye diffusion speed as slow as possible. Suitable for permeability good reactive dyes are: reactive flavine M a 5 g 4 g, brilliant blue, bright red K K a 3 r - GL, brilliant blue and turquoise blue K K - NG.Apply to stranded color reactive dyes are:active-RN,orange yellowk k-designed.the GN,brilliant orange,brilliant red k a k-G 2 bp,deep blue K-R.

(3) the fabric moisture content: the separation of the gel is used under the condition of the directional movement of liquid. In ooze color printing, the directional movement is under the capillary effect of fabric printing ink printing is released when water to color piece of exercise. To get a sufficient degree of bleeding, just paste release water is not enough. Cotton fabrics should be about 25% moisture content. Moisture content less than 20%, the degree of bleeding is not ideal; More than 28%, bleeding was significantly worse.

(4) other factors: in addition to the dye particles is large, affecting dye leakage and retention factors include: type, number with functional groups and paste dye functional groups on the surface of the gel and the fabric (the adsorbent) force size, and auxiliaries, dyes, water of the adsorbent surface active center is the competition, etc. Tests show that paste add urea, stranded color contour blur, that's because urea changed the residual dye on the size of the gel, the fabric reaction.

                                                               Excerpted by Le qi