Effect of nonionic surfactant on colloidal stability of water based ink

2020-12-09 16:53:59

The zeta potential curve showed that when aeo-7 concentration increased from 0 to 0.1 mol / L, zeta potential changed from - 37.9 MV to - 16.3 MV. Because the nonionic surfactant has no charge, its adsorption on the surface of carbon black particles will not cause the change of its charge, but the negative charge of carbon black particle surface decreases after adding aeo-7. The reason may be that aeo-7 adsorbs on the surface of carbon black particles, which makes the position of slip surface move or changes the adsorption characteristics of ions existing in the solution The average particle size curve showed that with the increase of aeo-7 concentration, the average particle size of carbon black particles increased from 154nm to 240nm, which indicated that the steric hindrance effect between carbon black particles of water-based ink might be reduced by adding aeo-7.

Aeo-7 not only has a great influence on zeta potential of the solution system, but also has a greater influence on the aggregation of carbon black particles than CTAB, SDS and capo. Figure 6 shows the effect of AEO-9 with different concentrations on the average particle size and zeta potential of water-based ink carbon black.

The influence of non-ionic surfactant on the colloidal stability of water-based ink the change trend of zeta potential and average particle size of carbon black particles in aqueous ink colloid solution after adding AEO-9 is the same as that of aeo-7.

When a substance is added to a liquid, if its surface tension can be reduced, it is said that the substance has surface activity. The substance with surface activity is called surfactant.

In terms of chemical structure, all surfactant molecules are composed of polar hydrophilic group and non-polar lipophilic group. The hydrophilic group makes the molecule extend to the water phase, while the lipophilic group makes the molecule leave the water phase and extend to the oil phase, so the surfactant molecule is amphiphilic. Their lipophilic groups are composed of hydrocarbon groups, while the hydrophilic groups are various. Because of its high surface activity, surfactants are widely used in various fields such as emulsification, dispersion, solubilization, wetting, foaming, washing and softening in industrial and agricultural production and daily life.

The effect of non-ionic surfactant fatty alcohol polyoxyethylene ether (AEO) on the colloidal stability of water-based ink was studied.

Because nonionic surfactants do not exist in ionic state in solution and are not easily affected by strong electrolytes, they are more and more widely used. The effects of aeo-7 and AEO-9 on the stable particle size and zeta potential of water-based ink were discussed.