近红外在线监测改性双基吸收药混合均匀度研究

Research on Near-infrared Online Monitoring for Blend Uniformity of Modified Double-base Absorbent Powders

为了解决吸收药混合均匀度的传统检测方法耗时费力、阻碍固体推进剂生产工艺自动化和连续化实现的问题,提出采用微型近红外光谱仪对处于持续搅拌动态的吸收药采集光谱、结合移动窗口标准偏差法对光谱差异进行定量分析来监测均匀度实时变化的方法。通过采用人工取样结合液相色谱的传统方法对混合过程各阶段样品体系的均匀度进行验证,其结果与采用近红外方法监测结果一致。实验表明近红外方法高效、环保、安全,具备在线监测吸收药混合均匀度并实时判断混合终点的可行性。

The conventional way takes a long time to determine the uniformity of absorbent powders in blend procedure, which is an obstacle to automation and continuation of production process of solid propellant. Near-infrared （NIR） analysis is proposed to solve that problem. A micro NIR spectrometer is used to collect the spectra of absorbent powders that are stirred continually, and the moving block of standard deviation （MBSD） algorithm is utilized to quantitatively analyze the difference between spectra of absorbent powders. The uniformity and endpoint are presented from the standard deviation-time curve. In addition, the accuracy of NIR analysis on the collected samples is confirmed through high performance liquid chromatography （HPLC）. The results show that NIR analysis is efficient, eco-friendly and safe. It is feasible to apply NIR analysis to monitor the blend uniformity of modified double-base absorbent powders online and determinate the endpoint of blend process in real-time.