高品质RDX在DNAN中的溶解及反复熔融特性研究

In order to study the dissolution, precipitation and repeated melting characteristics of high-quality RDX in 2, 4-dimitroanisole (DNAN), the solubility and its influencing factors of high quality RDX in DNAN were researched by high performance liquid chromatography(HPLC). The irreversible thickening characteristics of DNAN/high-quality RDX melt cast explosive after repeated melting were studied by process test, and the soluble and precipitated processes of high-quality RDX were observed and analyzed by hot-stage polarization microscope, which were compared with commercial RDX(three types). The results show that the solubility of high-quality RDX in DNAN decreases gradually with the increase of particle size, showing an approximate linear relationship. Meanwhile, the solubility of high-quality RDX in DNAN increases with the increase of temperature. The maximum solubility of high quality RDX (d₅₀=47μm) in DNAN is 8.87g/100g at 115℃, and the solubility of high-quality RDX is generally less than commercial RDX at different temperatures. The irreversible thickening degree of DNAN/high-quality RDX explosive is less than DNAN/commercial RDX after reiterative fusibility. The first soluble process of high-quality RDX starts from the irregular outer edge of the grain and the depression region of the crystal, the dissolution rate is influenced by particle size and irregularity, and it is significantly slower than commercial RDX. The precipitated processes of high-quality RDX have two ways and the shape is irregular after precipitation.