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This paper is a review, based on practical experience, of existing and new processes for making water-dispersable granules (WDGs) from pesticide technicals. The conventional process for making WDG pesticides is pan agglomeration. This process has disadvantages, however, which the new processes may overcome. The disadvantages include difficulty in limiting worker exposure to the pesticide involved, dealing with water-soluble and low-melting technicals, reducing to the absolute minimum dust generation during product handling, and so forth.
The new processes discussed are low pressure extrusion, dry compaction / granulation, spray-dryer agglomeration, and fluid bed agglomeration. Also discussed are ways to treat low-melting technicals to improve stability during milling and storage. The paper also discusses certain formulation elements, including surfactants, carriers, and disintegrants, which have been found to be particularly suitable for the new agglomeration processes.
pesticides, manufacturing processes, water-dispersable-granules, formulations, nonionic surfactants, anionic surfactants, carboxylated nonylphenols, naphthalene sulfonates, low-melting technicals
Group Leader, Powder Technology Laboratory, Witco Corp., Fort Worth, TX