基于油敏纸显示特性的热雾剂溶剂试验

Display characteristics on oil-sensitive paper for a hot fogging concentrate solvent

热烟雾载药防治技术具有防效高、用药省、无需用水等显著优点,但关于药液完全热力烟化后的雾滴沉积分布状态及悬浮停留时间却没有进行过系统研究。鉴于柴油在油敏纸上无法显示的现状,理论分析热雾剂的组成及特性,综合考虑溶解性、闪点、黏度、比热容、表面张力等因素,选取6种不同溶剂进行油敏纸显性和热力烟化特性试验研究,并以雾滴粒径和发烟量作为评价溶剂综合性能的指标。结果表明:邻苯二甲酸二甲酯在油敏纸上显性较好、热力烟化效果较佳、在喷管内的热分解损失可忽略,是一种性能良好的可供试验研究应用的热雾剂溶剂。

Thermal fogging technology has important features such as high efficiency, low chemical usage, and no water consumption. To conduct a theoretical analysis on composition and properties of a hot fogging concen- trate solvent and to improve deposition distribution and suspension residence time for droplets of pesticide after thermodynamic atomization, six kinds of solvents （dimethyl formamide, cyclohexanone, glycerol, dimethyl ph- thalate, soybean oil, and O# diesel） were chosen based on solubility, flash point, viscosity, specific heat, and surface tension, for an experiment. Droplet size and the amount of smoke were used as indexes for a compre- hensive performance evaluation of the solvents on oil-sensitive paper. Results showed that dimethyl phthalate was favorable as a hot fogging concentrate solvent with advantages of clear display characteristics, better ther- modynamic atomization, and no thermal decomposition loss. [Ch, 2 fig. 2 tab. 15 ref.]