超细HMX的微流体结晶调控及高通量制备

Microfluidic Crystallization Control and High-throughput Preparation of Ultrafine HMX

为了实现含能材料晶体微观结构的精确控制,提升超细含能材料的晶体品质和质量一致性,以HMX为研究对象,搭建微流体结晶平台,研究在微尺度条件下流体的流动特性,开展浓度、流量等反应参数条件对超细HMX晶体颗粒形态的影响研究,并进行了超细奥克托今(HMX)的批量制备探索。结果表明,与心型芯片相比,涡流型芯片具有更好的传质效果和更薄的边界层效应,更适合于脆性晶体的制备。DMSO作为溶剂时,HMX晶体具有较好的形貌,大小均一,球形度高;当流量比R分别为1、5、10时,HMX的平均粒径分别为8.86、4.14和0.86μm,随着R增大,HMX的粒径逐渐变小,粒径分布变窄;通过改变工艺参数,微流体结晶可实现不同形貌、粒径超细HMX的可控制备;利用多层组合与并联分流的方式,实现了超细HMX的高通量制备,该方法不仅混合效率差异小、产品处理量大且设备整体能耗低,可为高品质窄粒径范围微纳米含能材料的高通量制备提供思路。

To make accurate control of crystal microstructure and improve the crystal quality and quality consistence of ultra-fine energetic materials,a microfluidic crystallization platform was established and the flow characteristics of fluids under microscale conditions were studied by taken HMX as the research object.The effect of reaction parameters such as concentration and flow on the morphology of ultrafine HMX crystals was studied and the large-scale preparation of ultrafine HMX was explored.The results show that the swirling chip has better mass transfer effect and thinner boundary layer effect than the heart shaped chip,make it more suitable for the preparation of brittle crystals.When DMSO is used as solvent,HMX crystals have good morphology with uniform size and high sphericity.When the flow ratios R are 1,5,and 10,the average particle sizes of HMX are 8.86,4.14,and 0.86μm,respectively.With the increasing of R,the particle size of HMX gradually decreases and the particle size distribution narrows.By changing the process parameters,microfluidic crystallization can realize the controllable preparation of ultrafine HMX with different morphologies and particle sizes.The high-throughput preparation of ultra-fine HMX is realized by multi-layer combination and parallel shunt.This method not only has the merits of small mixing efficiency difference,large product processing capacity and low overall energy consumption of the equipment,but also provides a way for the high-throughput preparation of micro-nano energetic materials with narrow particle size range.