基于微流控技术的微纳米HNS制备在线监测研究

Research on On-Line Monitoring of Preparation of Micro-Nano HNS Based on Microfluidic Technology

为了实时掌握微纳米火工药剂制备过程的安全性及产品质量的稳定性,以典型传爆药六硝基茋(HNS)为研究对象,基于微流控、温度传感、压力传感及近红外测试技术设计微流控在线监测系统,对微纳米HNS制备过程进行在线监测研究。结果表明:制备过程中,两相流体的混合是一个放热过程,流体温度由19.4℃升高至23.6℃,且其在通道中充分混合需要一定的停留时间;过长的混合时间和通道内温度分布不均等因素会导致最终产品的粒径变大且分布较宽;微流体注射泵达到稳定工作至少需5 min左右,微通道内的最大压力可达0.15 MPa左右;通过近红外光谱的特征峰位置与吸光度强度,可以判断连续制备过程中流体参数及产品粒度分布的稳定性。

In order to real-time grasp the safety of the preparation process of pyrotechnic agents based on microfluidic technology and the stability of product quality,taking the typical booster explosive hexanitroaniline(HNS)as the research object,a microfluidic online monitoring system based on microfluidic,temperature sensing,pressure sensing and near-infrared testing technology was designed to conduct online monitoring research on the preparation process of micro-nano HNS.The results show that during the preparation process,the mixing of two-phase fluid is an exothermic process,with the fluid temperature increasing from 19.4℃to 23.6℃,and it requires a certain residence time to achieve complete mixing in the channel;Excessive mixing time and uneven temperature distribution in the channel can lead to an increase in the particle size and wider distribution of the final products;The stable operation of the microfluidic injection pump takes at least 5 minutes,and the maximum pressure inside the microchannel can reach about 0.15 MPa;The stability of fluid parameters and product particle size distribution during continuous preparation can be determined by the characteristic peak positions and absorbance intensity of near-infrared spectroscopy.