Preparation Of Nanoscale Pigment And The Effect Of Particle Properties On Dyeing Performance For Cotton

There are many advantages in pigment dyeing on textile, such as simple and short process, less pollution, low cost, and so on. With the enhancement of environmental protection consciousness, this technology becomes more and more important. In order to study the effect of particle properties on dyeing performance for cotton fabrics, we first prepared nanoscale pigment dispersion with different Zeta potentials, particle sizes and molecular structures via ultrasonic technology, respectively. And then investigated the effect of particle character on stabilities of the dispersion. Finally, the dyeing behavior on cotton fabrics with this dispersion was further investigated.The dispersion results showed that the better ultrasonic technology was 30min under 1200W with a pigment content of 20%. And choosed the anionic dispersant of LAS, the non-ionic dispersant FPE and the cationic dispersant DPTS as complex dispersants, while the total amount of dispersant was 30%. Zeta potential of the pigment dispersions can be achieved by changing the ratio of ionic and non-ionic dispersant in complex dispersion. When the Zeta potential was negative, the higher the proportion of anionic dispersant was, the smaller the Zeta potential of the pigment dispersion was. When the Zeta potential was positive, the higher the proportion of cationic dispersant was, the greater the Zeta potential of the pigment dispersion was. In a certain ultrasonic power, the efficiency of the pigment dispersion is closely related to the dispersion time and pigment molecular structure . The longer the dispersion time was, the smaller the particle size of the pigment dispersion was. Compared the molecular structure of the pigment dispersion to reach the dispersing balance of the order followed: Pigment Yellow 22, Pigment Red 14, Pigment Blue 15:3 and Pigment Black 32.The stability results showed that particle size and Zeta potential were the main factors that can determine the stability of nanoscale pigment dispersion. When particle size was similar, the larger absolute value of Zeta potential was, the better centrifugal stability and thermal stability of nanoscale pigment dispersion were. With the same Zeta potential, the smaller particle size was, the better centrifugal stability and thermal stability of nanoscale pigment dispersion were. Both of molecular structures and pH had a little effect on the stability of nanoscale pigment dispersion. However, Zeta potential would decrease when the pH increased in the range of 5 to 11. The dyeing behavior results showed that Zeta potential was the main factor which determined the dyeing performances of nanoscale pigment dispersion. With the same particle size, the larger the Zeta potential was, the larger the K/S value was, the higher color strength and dyeing rate were. The particle size was another important factor that could also affect the dyeing performance of nanoscale pigment dispersion. With the same Zeta potential, the smaller the particle size was, the larger the K/S value was, the smaller theΔE value was, the higher color strength and dyeing rate were, the better the dyeing fastness was. Molecular structures had a little effect on the dyeing performances of nanoscale pigment dispersion. And all of the nanoscale pigment dispersion with different particle properties dyed cotton fabric directly were the Langmuir absorption model.