In this paper

the influence of a double comb-shaped copolymer (AgrilanTM 752) on dispersion stability of imidacloprid suspension was studied with FTIR

SEM

XPS

zeta potential and particle size tests. AgrilanTM 752

which contained carboxyl groups

ester groups and poly-oxyethylene chain

combined with imidacloprid by hydrogen bond

van der Waals force and hydrophobic interaction

and dispersed imidacloprid particles in suspensions effectively. The experimental data indicated that thickness of AgrilanTM 752 adsorbed layers

zeta potential and dispersion stability of suspension reached maximum values when its content was 3%(mass)

i.e.

the optimum AgrilanTM 752 content under this experimental conditions was 3%(mass). Thickness of AgrilanTM 752 adsorbed layers decreased at initial pH > 6

zeta potential had a maximum value at initial pH = 10. On the other hand

dispersion stability was good at initial pH from 2 to 10

and became worse with increasing initial pH value. Moreover

experimental results suggested that electrolyte ions

such as Na+

Mg2+ and Ca2+ reduced thickness of AgrilanTM 752 adsorbed layers and zeta potential

and decreased the dispersion stability of imidacloprid suspension. Moreover

the ability of decreasing dispersion stability of imidacloprid suspension was Ca2+ > Mg2+ > Na+ at the same concentration.