Concentrated low viscosity agricultural formulations
A technology of dispersants and insecticides, applied in the field of dispersants, can solve the problems of clogged spray equipment, ineffectiveness, inconsistent application, etc.
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Embodiment approach
[0057] According to one embodiment, the aqueous agricultural composition comprises at least about 0.1% by weight of said dispersant, or at least about 0.5% by weight of said dispersant, or at least about 1% by weight of said dispersant, or at least about 3% by weight of said dispersant agent, or even at least about 5% by weight of the dispersant, based on the total weight of the aqueous agricultural composition.
[0058] In another embodiment, the aqueous agricultural composition comprises less than about 7 wt % of said dispersant, or less than about 6 wt % of said dispersant, or less than about 5 wt % of said dispersant, or less than about 4 wt % % of the dispersant, or even less than about 3 wt% of the dispersant, based on the total weight of the aqueous agricultural composition.
[0059] In yet another embodiment, the aqueous agricultural composition comprises about 0.05-7 wt% of said dispersant, or about 0.5-6 wt% of said dispersant, or about 1-5.5 wt% of said dispersant, ...
Embodiment 1
[0071] Embodiment 1: Dispersant synthetic process
[0072] The following procedure was used to prepare the dispersants used in the following examples.
[0073] In a suitable reaction vessel equipped with electric heating, overhead stirring and an inert atmosphere combine styrene maleic anhydride resin, anhydrous tetrahydrofuran (THF) and monoamine. The mixture was stirred and heated to 115°C over 4 hours, during which time the resin dissolved and reacted with the monoamine. After the reaction was complete, glycol ether solvent was added and THF was selectively removed under vacuum at 70°C to obtain a clear solution of the dispersant in glycol ether. The dispersant concentration is 50% on a solid basis.
[0074] Table 1
[0075]
Part 1SMA resin
Resin g
Part 2 Monoamines
Monoamine g
THF g
DPM g
Dispersant 1
SMA-1000
100
JEFFAMINE M-2070
820
900
920
Yes
Dispersant 2
SMA-1000
100 ...
Embodiment 2
[0103] Example 2: Comparing Dispersant Structures and Ostwald Ripening
[0104] This example highlights the fact that the dispersants of the present invention inhibit Ostwald ripening more effectively than structurally similar dispersants of the prior art.
[0105] Typically, if particles having a broad particle size are dispersed in the medium, there will be a differential dissolution rate of the particles in the medium. Differential dissolution results in thermodynamic instability of smaller particles relative to larger particles and produces a flow of material from smaller particles to larger particles. The result is that smaller particles dissolve in the medium and the dissolved material deposits onto larger particles, thereby increasing particle size. One such mechanism of particle growth is called Ostwald ripening.
[0106] Particle growth in the dispersion may cause the dispersion to become unstable during storage, allowing the particles to settle out of the dispersio...
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Abstract
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