Stabilized agrochemical composition
A technology of agrochemical and composition, applied in chemical/physical processes, fertilizer mixtures, chemical instruments and methods, etc., can solve problems such as phytotoxic effects, incompatibility, reduced spray effect, etc., to achieve enhanced biological performance, The effect of chemical and physical stability improvement
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example 1-2
[0156] A. preparation preparation
[0157] The dispersed phase was premixed with a low shear mixer as described in Table 1 below. 635 Thin Epoxy and 5562:1 Curing Agent were obtained from US Composites. Aerosil R972 was obtained from Evonik Degussa. As described in Table 1, the continuous phase and a colloidal stabilizer were premixed with a low shear mixer. The premixed dispersed phase is added to the continuous phase premix containing a colloidal stabilizer, and then mixed with a high shear mixer (e.g., Ultra ) 5-10 minutes. To accelerate the epoxy curing reaction, the mixed formulation was treated with high temperature (70°C) for 3 hrs.
[0158] The formulation samples thus obtained were examined microscopically and it was confirmed that the active ingredient was entrapped in the polymer matrix particles. The volume average particle size was measured with a Malvern particle sizer.
[0159] B. Release rate
[0160] These formulations were diluted in water with approp...
example 3
[0163] Example 3. Illustration of the use of different continuous phase liquids
[0164] Resin Mixture A of 19.1 g of 635 thin epoxy resin and 9.5 g of 556 2:1 curing agent was prepared. A 10 g sample of the liquid continuous phase below was then prepared by vortex mixing ethylene glycol with 0.2 g Aerosil 200 fumed silica as a colloidal stabilizer. Another liquid continuous phase sample of 10 g of liquid was also prepared by vortex mixing 0.5 g of Aerosil R972 hydrophobic fumed silica in Isopar V. Then, 0.2 g of resin mixture A was introduced into each continuous phase sample and dispersed by vortex mixing. These samples were placed on a platform shaker overnight at room temperature and then examined by light microscopy. In each case, the presence of a dispersion of epoxy resin particles was confirmed. This example shows that small particles of solid epoxy resin can be formed in a variety of different liquid continuous phases (water-miscible as well as water-immiscible). ...
example 4
[0165] Example 4. Controlling release rate by incorporating mobile molecules into the polymer matrix
[0166] Two different resin mixtures were prepared, each containing 27 wt% finely ground thiamethoxam. One mixture had the balance consisting of 48.7 wt% 635 thin epoxy resin and 24.3 wt% 556 epoxy curing agent. Another mixture had the balance consisting of 25wt% PEG200, 32wt% 635 thin epoxy, and 16wt% 556 2:1 curing agent. 6 g of each resin mixture was dispersed in 24 g of a liquid continuous phase consisting of 4 parts of Aerosil R972 and 76 parts of Isopar V under high shear. Both formulations were allowed to cure for 3 days at 38°C, and then an emulsifier was added in order to make the formulations dispersible in water. The release rate of thiamethoxam from these formulations was characterized as follows: 6.5 g of each formulation was mixed in a 160 g water sample in glass vials, the vials were placed on a shaker platform at room temperature and passed via Aqueous aliqu...
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