丁羟推进剂药浆固化过程中触变性转变规律研究

Study on Transition Law of Thixotropic Characteristics of HTPB Propellant Slurry during Solidification

关键词:  复合推进剂  流变学  触变性  剪切速率  固化反应

Key words:  Composite propellant  Rheological  Thixotropy  Shear rate  Solidification reaction

摘要:

为研究固化反应对丁羟推进剂药浆触变性的影响，对丁羟推进剂药浆在固化反应过程中触变性转变规律进行了实验研究和理论分析。结果表明，推进剂药浆的触变性受到固化时间和剪切速率两个因素的显著影响：剪切速率增高会促使药浆呈现触变性；固化时间增长会促使药浆呈现反触变性。药浆触变性转变的剪切速率为0.2s^-1~0.5s^-1，剪切速率小于此范围时完全呈现反触变性；大于此范围时药浆完全呈现触变性。当剪切速率进入转变区间后，会先从低固化时间处由反触变性转变为触变性，随着固化时间的增长触变性消失，反触变性再次出现。剪切速率越高反触变性重新出现所需固化时间越长，超出转变区间后反触变性不再出现，药浆完全呈现触变性。

Abstract:

In order to study the effect of solidification reaction on the thixotropy of HTPB propellant slurry, the thixotropy transition law of HTPB propellant slurry during solidification reaction was studied experimentally and theoretically. The results show that the thixotropy of propellant slurry is significantly affected by solidification time and shear rate: the increase of shear rate will cause the slurry to exhibit thixotropy; the increase of solidification time will cause the slurry exhibit anti-thixotropy. The shear rate range of thixotropy transformation is 0.2s^-1 to 0.5s^-1. When the shear rate is lower than this range, the slurry completely shows anti-thixotropy. Beyond this range, the slurry completely shows thixotropy. When the shear rate is in the range of transition,it will change from anti-thixotropy to thixotropy at low solidification time.With the increase of solidification time, the thixotropy disappears, and the anti-thixotropy appears again. The higher shear rate is, the longer solidification time is required for the anti-thixotropy to reappear. Beyond the transformation range, the anti-thixotropy no longer appears, and the slurry completely exhibit thixotropy.