Studies on the dispersion of nanometer titania and its finishing on textiles

The dispersion stability performance of several common dispersants and their formulations onto nm powders in aq.TiO2 suspensions was studied.It was concluded that the formulations from macromolecules and minimolecule electrolytes resulted in good dispersion.The influences of dispersant dosage,suspension pH value and ultrasonic vibration-dispersion time on the suspension stability were also studied.An exptl.dispersion process was detd.,with which the transmittance of the dispersion system was 4.8% after the dispersion and 1 h standing of the suspension,decreased by 51.5% as compared to that of the dispersant-free system.The homogeneity of the nm TiO2 particle distribution and anti-uv property were discussed for the textiles finished with 3 finishing processes.It was believed that the double dipping-double padding process gave good comprehensive effects,resulting in both homogeneous finishing effects and less fabric damages.