爆胶棉对浇铸高能少烟CMDB推进剂工艺和力学性能影响

Effect of Plastic Nitrocellulose on Mechanical Property and Process of Casting High Energy Composite Modified Double-Base Propellant with Low Smoke

采用HAAKE流变仪和单轴拉伸试验，分别研究了爆胶棉（PNC）对浇铸商能改性双基推进剂（CMDB）推进剂工艺与力学性能的影响，并用B．S．T公式计算了含PNC的推进剂的物理交联密度。结果表明，在PNC含量为0．1％-0．5％的范围内，CMDB推进剂药浆为典型的假塑性流体；其粘度一剪切速率曲线均符合OstwalddeWaele方程；PNC含量增大，CMDB推进剂药浆的表观粘度（剪切速率为1s-1）增大，其流平性能逐渐变差，但仍具有较长的适用期，可满足推进剂工程化的工艺要求。研究还表明，在CMDB推进剂中适量增加PNC含量，可提高推进剂中的物理交联密度，改善推进剂的密实性、连续性以及粘结剂基体对填料的包覆效果，提高推进剂的高、低温（50℃和20℃）抗拉强度。

Effect of contents of plastic nitrocellulose（PNC） on mechanical property and preparation process of casting high energy composite modified double-base （CMDB） propellant with low smoke were studied by means of HAAKE rheometer and single axes tensile test,and physical cross-linking density（ Vp ） of the CMDB propellants we＇re calculated by means of the B. S. T equation. Results show that the rheology of the CMDB propellants possess characteristics of pseudoplastic liquid,and viscosity （shear rate is 1 s-1 ） of the CMDB propellant increases significantly with increase in content of PNC. The leveling property of the CMDB propellant becomes bad with increase in content of PNC; the pot life of the CMDB propellants with various PNC contents are long enough to meet the preparation process of the propellant. It is also found that, appropriate increase in content of PNC is helpful to enhancement of not only the tensile strength at ＋20 ℃ and ＋50 ℃ of the propellants,but also physical cross-linking density（vp） of the propellants; and it can also improve continuity and close-grained property of the propellants,and packing effect between binder system and particles.