Abstract
In this study, pyraclostrobin nanocapsules were prepared by in situ polymerization with urea–formaldehyde resin as a wall material. The effects of different emulsifiers, emulsifier concentrations, and solvents on the physicochemical properties of pyraclostrobin nanocapsules were investigated. Solvesso™ 100 was selected as the solvent, and Emulsifier 600# was used as the emulsifier, which accounted for 5% of the aqueous phase system, to prepare pyraclostrobin nanocapsules with excellent physical and chemical properties. The particle size, ζ potential, and morphology of the nanocapsules were characterized by a particle size analyzer and transmission electron microscope. The nanocapsules were analyzed by Fourier-transform infrared spectroscopy, and the loading content and sustained release properties of the nanocapsules were measured. The results show that the size of the prepared nanocapsules was 261.87 nm, and the polydispersity index (PDI) was 0.12, presenting a uniform spherical appearance. The loading content of the pyraclostrobin nanocapsules was 14.3%, and their cumulative release rate was 70.99% at 250 h, providing better efficacy and sustainability compared with the pyraclostrobin commercial formulation.
Highlights
Pesticides are necessary for preventing major biological disasters, protecting agricultural production, and ensuring the safety of national food production [1]
The results show that the average particle size, D90, and polydispersity index (PDI) of the nanocapsules prepared with the two emulsifier average particle size, D90, and PDI of the nanocapsules prepared with the two emulsificoncentrations above were smaller, and the degree of dispersion was better
Study,pyraclostrobin pyraclostrobin nanocapsules successfully prepared an in situ polymerization method
Summary
Pesticides are necessary for preventing major biological disasters, protecting agricultural production, and ensuring the safety of national food production [1]. Pesticides technicial require processing into a variety of formulations before a pesticide can be put into practical production and applied in the environment. The characteristics of pesticide formulations, control objects and application methods determine the different application concentrations. There are more than 50 pesticide formulations on the market, which can be roughly divided into two categories. One category is represented by traditional pesticide formulations, such as emulsifiable concentrates (ECs), wettable powders (WPs), and granules (GRs). Some pesticide formulations have limitations such as a large particle size, low effective utilization rate, poor dispersion, and inconvenient transportation for practical applications [3,4,5]. The preparation of novel pesticide formulations using new materials and new methods has become necessary to improve pesticide performance, which is of great significance in agricultural production
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