液滴微流控技术制备TATB基PBX复合微球

Preparation of TATB-based PBX Composite Microspheres by Droplet Microfluidic Technology

为了调控高聚合物黏结炸药(PBXs)的形貌、粒径分布和涂层包覆效果,采用高灵敏度的液滴微流控技术制备了TATB/F2602微球。研究了黏结剂含量和流量大小对TATB/F2602微球的形貌和粒径的影响。通过扫描电镜、X射线衍射、比表面积、DSC和TG等测试方法,系统研究了微球样品的形貌、结构、成分和热行为。结果表明:黏结剂含量为5%时微球具有光滑表面、规则球形形状和高单分散性,平均圆形度为0.921(跨度为0.040);通过调控流量比逐渐增大,微球样品D50从51.73μm减小到44.31μm,且粒径分布窄(跨度小于0.4);氟橡胶(F2602)均匀分布于TATB微球内部和表面,均匀地包覆TATB颗粒使微球样品热分解延后4.08℃;与原料TATB相比,球形化过程使TATB/F2602真密度增加到1.9780 g·cm^(-3)。液滴微流控技术可以有效调控炸药微球的形貌和粒径,为高聚物黏结炸药的球形化制备提供参考。

To control the morphology,particle size distribution and coating covering effect of high polymer binder explosives(PBXs),TATB/F2602 microspheres could be prepared via high sensitivity droplet microfluidic technology,and investigated the effects of binder content and flow rate on the morphology and particle size of TATB-based microspheres.Moreover,it studied the morphology,structure,composition and thermal behavior of microsphere samples systematically using scanning electron microscopy,X-ray diffraction,specific surface area,DSC and TG,respectively.Results show that,when the binder content is 5%,the microspheres have smooth surfaces,regular spherical shapes and high spherical monodispersity,and the average roundness is 0.921(span=0.04).With the increase of flow ratio,the D50of microsphere sample decreased from 51.73 to 44.31μm,and the particle size distribution is narrow(span<0.4).Fluororubber(F2602)is uniformly distributed in the interior and surface of TATB microspheres,and uniform coating of TATB particles delay the thermal decomposition of microspheres by 4.08℃.Compared with raw TATB,the true density of TATB/F2602 increases to 1.9780 g·cm^(-3)during spheroidization.The droplet microfluidic technology can effectively control the morphology and particle size of explosive microspheres,and provide experimental reference for the spherical preparation of polymer bonded explosives.