Abstract
Photolysis and poor retention significantly decrease the utilization efficiency of photosensitive agrochemicals, leading to considerable ecological and economic losses. We successfully prepared novel pyraclostrobin-loaded polyurethane-inorganic hybrid microcapsules (Pyr@KCeO2-PU MCs) with high adhesion and UV stability by interfacial polymerization. CeO2 nanoparticles (NPs) were incorporated as UV light absorbers, while a silane coupling agent (KH550) was employed for in situ crosslinking of PU with CeO2 NPs, facilitating their dispersion within the PU shell. Characterization results revealed a high encapsulation efficiency of 90 % and uniform sizes (D50 = 915 nm) for the Pyr@KCeO2-PU MCs. Optical property investigations using UV–vis spectroscopy indicated that the integration of CeO2 NPs within the PU shell produced stronger UV absorption bands compared to both Pyr technical (TC) and Pyr@PU MCs. This observation underscores the potential of CeO2 NPs as effective UV absorbers. The anti-photolysis performance of Pyr@KCeO2-PU MCs improved with the addition of CeO2 NPs, yielding a retention rate of Pyr in Pyr@KCeO2-PU MCs that was 1.90 and 1.27 times greater than that of Pyr TC and Pyr@PU MCs, respectively, under UV irradiation. Furthermore, KH550 not only facilitated crosslinking between PU and CeO2 NPs, ensuring uniform distribution of CeO2 NPs on the PU shell surface, but also enhanced wettability and foliar retention. The contact angle of Pyr@KCeO2-PU MCs (32°) was significantly lower than that of Pyr@PU MCs (84°), and Pyr retention on rice leaves was 17.5 mg/cm2 for Pyr@KCeO2-PU MCs, surpassing that of Pyr@PU MCs (9.3 mg/cm2). Additionally, Pyr@KCeO2-PU MCs exhibited superior efficacy against various plant pathogens compared to Pyr TC and Seltima. These findings highlight the potential of Pyr@KCeO2-PU MCs for enhancing pesticide utilization and offer valuable insights for the future development of PU-based pesticide formulations.
Published Version
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