Crop protection formulations are highly engineered, regulated and available in liquids and solids. And, each distinct formulation requires its own unique dispersion chemistry. That’s why Ingevity offers an array of dispersant products - tailored to the needs of your specific formulation.
We make dispersants.
In lignosulfonate dispersants, the degree of sulfonation influences the strength of adsorption to the surface of the active ingredient. Degree of sulfonation is defined as the moles of sulfonate per kilogram of salt-free lignosulfonate; or, the amount of sulfonate chemically bonded to the lignin. A lower degree of sulfonation makes the lignosulfonate less water soluble, giving it a higher affinity for a hydrophobic surface, such as the surface of an active ingredient in a suspension concentrate.
In a suspension concentrate, a hydrophobic active ingredient is suspended in an aqueous liquid, demanding much more from the dispersant. The most important performance factor influencing the dispersing agent is how well it absorbs to the surface of the active ingredients in solution.
Water Dispersible Granules and Wettable Powders
In water dispersible granules (WDG) and wettable powders (WP), both disintegration rate and suspension of disintegrated product are important. Products with a low degree of sulfonation have strong suspension properties but are slower to disintegrate than those with a higher degree of sulfonation. That means WDG and WP applications require a slightly higher degree of sulfonation that provides surface adsorption (dispersion) as well as more balanced, faster disintegration rates.