Dec. 21, 2022
Qi Wang, Ph.D., Technical Director of Agricultural Solutions of Ingevity delivered a speech titled ″Crystal growth inhibition solutions and case study″ at the 3rd Ag Formulation & Application Technology Congress (FAT 2022) during 17-18, Nov. 2022 in Hangzhou, China.
The issue of crystallization and the particle size increase in pesticide technical suspensions are among the most common and serious problems in formulations of this kind. The problem may cause severe formulation instability, which eventually causes failure of formulations. A correct understanding of the mechanism of the technical material crystallization and particle size increase will help to effectively solve the problem, thus, providing a stable and robust formulation. Dr. Qi Wang, presented to participants the mechanism of crystal growth in pesticide suspensions, along with examples and tactics for controlling crystal growth. She points out that the most effective way to control crystallization is to choose high-effective dispersants because high-efficient dispersants can provide an effective adhesion to technical materials, improve grinding efficiency and stabilize the performance of formulations under different temperatures. Also, adding additives with high ionic strength, such as lignosulfonate with a high degree of sulfonation and inorganic salts of small molecules, can effectively reduce the water solubility of technical materials, thereby controlling crystal crystallization. In contrast to small-molecule inorganic salts, lignosulfonate with a high degree of sulfonation will compete with the molecules of technical materials, thus, reducing crystal crystallization by reducing the molecule’s reabsorption of technical materials. It is also possible that the long-term stability of formulations can be maintained via the combined use of nonionic surfactants and ionic surfactants. Lastly, the right amount of rheology modifier can slow the physical contact between the particles, reducing the possibility of agglomeration.
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