固化温度对浇注PBX固化应力的影响  

Effects of Temperature on Curing Stresses of Casting Plastic Bonded Explosives

作　　者：陈春燕[1] 王晓峰[1] 徐洪涛[1] 冯晓军[1] 高立龙[1] 南海[1] 

机构地区：[1]西安近代化学研究所,陕西西安710065

出　　处：《含能材料》2014年第3期371-375,共5页Chinese Journal of Energetic Materials

基　　金：国防973资助项目(51340030101)

摘　　要：为改进固化工艺,确保浇注高聚物粘结炸药(PBX)的发射安全性,采用自制的间接应力感应器测试了浇注PBX药浆从液态到固态转变过程中应力的变化。研究了固化温度对浇注PBX固化应力的影响。结果表明:热固性浇注PBX固化过程包括从常温到固化温度的快速热膨胀,恒温固化阶段的热膨胀与交联收缩及固化降温时的冷缩变形三个阶段。研究了恒温固化过程中测试瓶的变形。根据变形情况计算了浇注PBX的固化应力。固化温度对PBX变形影响明显。当固化温度为100,90,80,60℃时,浇注PBX在固化过程中的最大热应力分别为2.14,0.72,0.56,0.29 MPa;固化过程的收缩应力分别为0.29,0.25,0.24,0.21 MPa,显示固化温度对恒温阶段固化热应力及收缩应力影响较大,固化温度越高,固化热应力及收缩应力越大。可以根据固化过程的应变-时间曲线,采取前期低温固化以减小固化应力,在固化应力变化平稳的后期升高温度以提高效率的变温固化工艺。To improve curing process and to ensure the the launch safety of casting plastic bonded explosives（ PBX）,the strain change in the process of transition of from liquid to solid for casting PBX was measured by a self-designed-made indirect stress sensor. The effect of curing temperature on the curing stresses of casting PBX was studied. Results show that curing process of PBX includes three stages： the rapid thermal expansion from room temperature to curing temperature,the thermal expansion and crosslinking shrinkage at curing temperature and the shrinkage at cooling stage. The defomation of the test bottles was studied. The casting solidification strain of casting PBX was calculated according to the defomation. The solidification temperature has an abvious effect on defomation of PBX. When the solidification temperature are 100,90,80,and 60 ℃,the maximum curing stresses of PBX are 2. 14,0. 72,0. 56,and 0. 29 MPa,respectively,and the shrinkage stresses of PBX networks are 0. 29,0. 25,0. 24,and 0. 21 MPa,respectively,revealing that the curing temperature at isothermal curing stage has a greater influnce on the thermal stress and shrinkage stress,the higher curing temperature,the bigger curing thermal stress and shrinkage stress. According to the strain-time curve of the solidification process,the low temperature curing to reduce the curing stress tn the earlier stage and elevanted temperature in the later stage of the curing stress changes smoothly are taken to improve the efficiency of variable temperature curing process.

关 键 词：高分子化学 热固性 高聚物粘结炸药(PBX) 固化应力 固化温度 

分 类 号：TQ560.6[化学工程—炸药化工]