Abstract:

In order to slow down the speed of disperse dyes prrcipitation after standing, 150% LB disperse dyes black slurry was used as raw material for exploring the   influence of carbamide solubilization on properties of disperse dyes black slurry at high-speed shearing dispersion. The results show that the speed of disperse dyes precipitation could be slowed down by either adding dosage of the dispersant MF and carbamide or adjusting the pH value of disperse dyes black slurry. the precipitability of the disperse dyes slurry with adding mass fraction of 50% carbamide reduces from 86.04% to 75.18% after standingsixty days. By adding mass fraction of 50% carbamide，the centrifugal stability of the three kinds of disperse dyes C.I. Disperse Orange 288、C.I. Disperse Violet 93:1 and C.I. Disperse Blue 291:3 promotes 39.9%-42.19%、29.06%-29.99% and 26.78%-27.38% ,respectively，the dye-uptake of the three disperse dyes increases 2.08%-2.19%、0.73%-1.1% and 0.72%-0.99%, respectively，and the K/S value of the textile promotes from 9.782 to 9.876；At the same time, carbamide solubilization reduces the average grain diameter of the disperse dyes.

Key words: carbamide, solubilization, desperse dye, slurry precipitation