喷雾干燥工艺条件对HMX/F_(2602)核壳复合微球粒度的影响

Effect of the Spray Drying Technological Conditions on the Particle Size of HMX/F_(2602) Core-shell Composite Microspheres

采用悬浮喷雾干燥法将偏氟乙烯和六氟丙烯共聚物(F_(2602))包覆于HMX颗粒表面,制备了HMX/F_(2602)核壳复合微球。采用共混溶液喷雾干燥法制备了HMX/F_(2602)复合微球。探讨了进口温度、进料速率和料液浓度等悬浮喷雾干燥工艺条件对HMX/F_(2602)核壳复合微球粒度的影响。利用扫描电子显微镜(SEM)、激光粒度分析仪和撞击感度仪表征了两个样品的形貌、粒度和撞击感度。结果表明,悬浮喷雾干燥法的优化工艺条件为:入口温度85℃,进料速率3 m L·min^(-1),料液浓度2%。HMX/F_(2602)复合微球有内部缺陷,中值粒径为4.75μm。HMX/F_(2602)核壳复合微球为实心球状,中值粒径1.23μm。HMX/F_(2602)复合微球和HMX/F_(2602)核壳复合微球的撞击特性落高分别为31.23 cm和41.37 cm,显示HMX/F_(2602)核壳复合微球有更好的性能。

HMX/F2602 core-shell composite microspheres were prepared via coat of F2602 on HMX particle surface using the suspen- sion spray drying method, and HMX/F2602 composite microspheres were prepared by the blended solution spray drying method. The effects of the suspension spray drying technological conditions including the inlet temperature, feed rate and solution concen- tration on the particle size of HMX/F2602 core-shell composite microspheres were investigated. The particle morphology, particle size and impact sensitivity of two samples were characterized by scanning electron microscopy （SEM）, laser particle size analyzer and impact sensitivity test. Results show that the optimal conditions of suspension spray drying method are the inlet temperature of 85 ℃, the feed rate of 3 mL · min-1 and the solution concentration of 2%. The HMX/F2602 composite microspheres have internal defects, and its median particle size is 4.75μ m. The morphology of HMX/F2602 core-shell composite microspheres is solid sphere with median particle size of 1.23 μm. The drop height of impact sensitivity for HMX/F2602 composite microspheres and HMX/F2602 core-shell composite microspheres is 31.23 cm and 41.37 cm, respectively, revealing that the HMX/F2602 core-shell composite microspheres have better prooerties.