Effects of nonionic surfactants on properties of water dispersible granule formulations

摘要

Nonionic surfactants are not generally used in water dispersible granule formulations. Common dispersants for these systems include lignin sulfonates and naphthalene sulfonates. Recent studies have shown that ethylene oxide/propylene oxide (EO/PO) block copolymers can also be used to stabilize atrazine dry flowables in both pan granulation and extrusion processes. In laboratory tests, they impart better granule hardness and provide markedly improved suspensibility compared to the anionic dispersants. Most of the formulations tested show good particle size stability over time at room and elevated temperatures. Some particle size increase was seen in some formulations at 45 deg C.