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为了以较小的能量损失获得低感度的包覆RDX,采用液相沉淀法,以GAP基含能聚氨酯弹性体对RDX进行了包覆研究。通过傅立叶红外光谱(FTIR)、扫描电镜(SEM)、X射线光电子能谱(XPS)、差示扫描量热法(DSC)、有机元素分析、感度测试、流散性测试等方法对包覆样品进行了表征。结果表明,包覆样品颗粒表面有明显包覆层存在,颗粒流散性较包覆前有所提高,包覆度R为72.5%,包覆层质量分数为0.98%,与投料值1%基本相当;热分解峰温较包覆前有所降低;包覆样品的FTIR谱图中在2 100 cm-1附近含有明显的—N3吸收峰,且峰形尖锐;以1%GAP基聚氨酯弹性体包覆的RDX的特性落高从包覆前的25.6 cm提高到47.9 cm,增加近1倍;摩擦感度爆炸百分数从72%下降到40%。
In order to obtain a low sensitivity coating RDX with a small energy loss, RDX was coated with GAP-based polyurethane elastomer by liquid-phase precipitation method. The coated samples were characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), differential scanning calorimetry (DSC), organic elemental analysis, sensitivity test, Characterization. The results showed that there was obvious coating on the surface of the coated sample, and the dispersibility of the particles increased before the coating. The coating coverage was 72.5%, the coating mass fraction was 0.98%, which was almost equal to the feed value of 1% ; The peak temperature of thermal decomposition was lower than that before the coating; the FTIR spectrum of the coated sample had obvious -N3 absorption peak near 2 100 cm-1, and the peak shape was sharp; with 1% GAP-based polyurethane elastomer package Coverage of RDX decreased from nearly 25.6 cm before coating to 47.9 cm, nearly doubled. The percentage of friction sensitivity explosions decreased from 72% to 40%.