低铝低燃速HTPB推进剂工艺性能影响研究

为研究固体填料粒度级配及工艺助剂对低铝低燃速HTPB推进剂工艺性能的影响，本文依据固体颗粒堆积最密集排列理论，建立了固体颗粒级配模型，结合固体填料实际粒径，计算得到两种理想刚性球的堆积结果，并在此基础上考察了不同级配配方药浆流动性及触变性。同时，通过筛选工艺助剂种类及优化最适助剂用量，对比了加入不同工艺助剂配方药浆的触变性。结果表明：当采用双二级配模型，计算出的固体颗粒级配比例最优；通过进一步优化固体颗粒级配，结合药浆触变环大小快速判定了推进剂固体级配的合理性，提高了低铝低燃速HTPB推进剂配方工艺性能的可设计性；当工艺助剂选用SU-2，且用量为0.03%时，推进剂工艺性能明显改善，适用期可达596min。

Study on the Process Performance of Low Aluminum and Low Burning Rate HTPB Propellant

In order to study the effect of solid filler particle size grading and process additives on the process performance of low aluminum low burning rate HTPB propellant, a solid particle grading model based on the theory of the most densely packed solid particles was established. And combined with the actual particle size of solid filler, the packing results of two kinds of ideal rigid balls were calculated. On this basis, the fluidity and thixotropy of slurry with different grading formulas were investigated. At the same time, by screening the types of process additives and optimizing the optimum dosage of additives, the thixotropy of the formulations with different process additives was compared. The results show that when the double secondary gradation model is used, the calculated solid particle gradation ratio is the best. By further optimizing the solid particle gradation and combining with the thixotropic ring size of the slurry, the rationality of the solid grading of the propellant is quickly determined, and the designability of the process performance of the low aluminum and low burning rate propellant is improved. When SU-2 is selected as the process additive and its dosage is 0.03%, the process performance of the propellant is significantly improved, and the pot life can reach 596 min.