Microcapsulses can effectively encapsulate, protect, and control the release of insecticides. In this study, emulsion–solvent evaporation method was used to fabricate microcapsules (MCs) by using beta-cyhalothrin as the entrapped insecticide, dichloromethane as the solvent, polylactic acid (PLA) as the carrier materials, and polyvinyl alcohol as the emulsifier. Response surface methodology was used to determine the optimal process of beta-cyhalothrin MCs, the specific parameters are as follows: 0.52 g beta-cyhalothrin, 0.46 g PLA, 6.67 g dichloromethane and 0.37 g PVA. The fabricated beta-cyhalothrin MCs were characterized through microscopic morphology observation, particle size and distribution analysis, and Fourier transform infrared spectroscopy. The release kinetics in the acetonitrile and the bioassay of beta-cyhalothrin MCs were investigated. The results showed that the beta-cyhalothrin was successfully encapsulated in the PLA. The beta-cyhalothrin MCs showed a regular spherical structure, relatively uniform particle size, and the D₅₀ was 2.44 μm. Compared to the technical beta-cyhalothrin, the beta-cyhalothrin MCs showed good sustained release performance and prolonged the control effect against Blattella germanica.

微囊可以有效地封装，保护和控制杀虫剂的释放。在这项研究中，使用乳液-溶剂蒸发法，以β-氯氟氰菊酯为包埋的杀虫剂，以二氯甲烷为溶剂，以聚乳酸（PLA）为载体材料，并以聚乙烯醇为乳化剂来制备微胶囊（MCs）。用响应面法确定β-氯氟氰菊酯的最佳工艺，具体参数如下：0.52gβ-氯氟氰菊酯，0.46g PLA，6.67g二氯甲烷和0.37g PVA。通过显微镜形态观察，粒度和分布分析以及傅立叶变换红外光谱对制备的β-氯氟氰菊酯微胶囊进行了表征。研究了乙腈中的释放动力学和β-氯氟氰菊酯MC的生物测定。结果表明，β-氯氟氰菊酯被成功地包裹在PLA中。β-氯氟氰菊酯MCs显示规则的球形结构，相对均匀的粒径和D₅₀为2.44μm。与技术性β-氯氟氰菊酯相比，β-氟氯氰菊酯MCs表现出良好的持续释放性能，并延长了对德国小Bl的控制作用。