Pretilachlor Releasable Polyurea Microcapsules Suspension Optimization and Its Paddy Field Weeding Investigation

Frontiers in Chemistry

Hongkun Wang¹  Hongjun Chen²  Chenzhong Jin³  Shuqi Deng³  Xiu Liu³  Linya Huang³  Jingbo Li³  Xiaoming Ou⁴ 

[1] Forestry Bureau of Lanshan County, Lanshan, China;Hunan Provincial Key Laboratory of Fine Ceramics and Powder Materials, School of Materials and Environmental Engineering, Hunan University of Humanities, Science and Technology, Loudi, China;Key Laboratory of Pesticide Harmless Application in Hunan Higher Education, Hunan Provincial Collaborative Innovation Center for Field Weeds Control, Hunan University of Humanities, Science and Technology, Loudi, China;National Engineering Research Center for Agrochemicals, Hunan Research Institute of Chemical Industry, Changsha, China;

关键词: pretilachlor;    weeding;    herbicidal activity;    polyurea microcapsules suspension;    response surface methodology;   

DOI  :  10.3389/fchem.2020.00826

来源: DOAJ

【 摘 要 】

In this study, pretilachlor was encapsulated into polyurea microcapsules prepared by water-initiated polymerization of polyaryl polymethylene isocyanate and eventually made into pretilachlor microcapsules suspension (PMS). We used response surface methodology (RSM) combined with the Box–Behnken design (BBD) model to optimize the formulation of PMS. The encapsulation efficiency (EE) of PMS was investigated with respect to three independent variables including wall material dosage (X1), emulsifier dosage (X2), and polymerization stirring speed (X3). The results showed that the regression equation model had a satisfactory accuracy in predicting the EE of PMS. To achieve an optimal condition for PMS preparation, the dose of wall material was set to 5%, the dose of emulsifier was set to 3.5% and the polymerization stirring speed was set to 200 rpm. The EE of PMS was up to 95.68% under the optimized condition, and the spherical shape with smooth surface morphology was observed. PMS was also proven to have delayed release capability and in vivo herbicidal activity against barnyard grass [Echinochloa crusgalli (L.) Beauv.] with an LC50 value of 274 mg/L. Furthermore, PMS had efficient weed management compared to commercially available 30% pretilachlor emulsifier (PE), showing a promising potential application for weeding paddy fields.

【 授权许可】

Unknown