超临界RESS法包覆超细RDX工艺

Technology of Ultra-fine RDX Coating with Rapid Expansion of Supercritical Solution Method

采用超临界流体R ESS法对超细黑索今(RD X)进行了包覆,研究了不同系统温度、溶液浓度、系统压力对包覆后超细RD X造型粉效果的影响,并对其进行撞击感度测试。结果表明,系统温度45℃以上,造型粉颗粒之间氟橡胶粘结在一起,分散性较差;氟橡胶浓度0.4 g/m L以上,其造型粉颗粒尺寸增大;系统压力降低到12 M P a以下,颗粒表面未完全被氟橡胶包覆,且分散性也较差。当系统温度40℃、氟橡胶浓度0.3 g/m L、系统压力14 M P a、通气时间20 m in条件下,包覆效果最好。包覆后样品撞击感度特性落高比超细RD X(25.2 cm)提高了9.48 cm。

Ultra-fine RDX was coated with FPM2602 by Rapid Expansion of Supercritical Solutions method（RESS）.The influence of factors,such as different system temperature,the system pressure,solution concentration and the molding on the coated RDX powder were studied.And the impact sensitivity of coated RDX was tested.Results indicate that the FPM2602 in the RDX powder bonded together with poor dispersivity when system temperature was above 45 ℃.The size of RDX powder is increased when the concentration of FPM2602 is above 0.3 g/mL.There are not completely granular surface coated of RDX when the system pressure reduce to 12 MPa below.The optimum technology condition are as follow： the system temperature was 40 ℃,the concentration of FPM2602 is 0.3 g/mL,the system pressure is 14 MPa.The value of characteristics height H50 for coated samples is higher than that of ultra-fine RDX（H50=25.2 cm）9.48 cm.