Zhu Linfang, Jiang Guangqi, Cen Jun, Li Linhuai
College of Chemistry and Chemical Engineering, Guizhou University Guiyang China.
State Key Laboratory Breeding Base of Green Pesticide and Agricultural Bioengineering, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guizhou University Guiyang China
RSC Adv. 2022 Jun 7;12(26):16918-16926. doi: 10.1039/d2ra02787a. eCollection 2022 Jun 1.
To improve the utilization rate of chlorfenapyr and make the wall material of chlorfenapyr microcapsules easily degradable, polylactide diol, toluene diisocyanate and 1,4-butanediol were used to prepare a chlorfenapyr microcapsule suspension by interfacial polymerization. The product was characterized by the methods of optical microscopy, scanning electron microscopy and Fourier-transform infrared spectroscopy. The results indicated that the microcapsule particles were spherical, with an encapsulation efficiency of 84.20%. The diluted product had good wetting and spreading abilities on cabbage leaves. Compared with other commercial formulations, the slow-release effect of the microcapsule suspension was more obvious and the release mechanisms conform to Fickian diffusion, with the release rate controllable by adjusting the external pH conditions. Furthermore, the wall material of the microcapsules showed good degradation performance in a phosphate-buffered solution. Microencapsulation by this method significantly increased the validity period of chlorfenapyr and the wall material was also degraded easily.
为提高溴虫腈的利用率并使溴虫腈微胶囊的壁材易于降解，采用聚丙交酯二醇、甲苯二异氰酸酯和1,4-丁二醇通过界面聚合法制备溴虫腈微胶囊悬浮剂。采用光学显微镜、扫描电子显微镜和傅里叶变换红外光谱法对产物进行表征。结果表明，微胶囊颗粒呈球形，包封率为84.20%。稀释后的产品在甘蓝叶片上具有良好的润湿和铺展能力。与其他商业制剂相比，微胶囊悬浮剂的缓释效果更明显，释放机制符合菲克扩散，通过调节外部pH条件可控制释放速率。此外，微胶囊的壁材在磷酸盐缓冲溶液中表现出良好的降解性能。通过这种方法进行微囊化显著延长了溴虫腈的有效期，且壁材也易于降解。
