【摘要】 为掌握高固含量改性双基推进剂连续剪切压延工艺特点,采用固体填料质量分数为30%～50%的高固模拟料进行连续剪切压延试验,研究了模拟料的粘辊状态、温度分布、含水率等;并通过SEM分析了试样的微观状态和混合效果,结合DSC定量分析了物料的塑化度。结果表明,随固含量增加,物料在剪切压延机的进料端粘辊效果变差,中后部粘辊良好,辊面温度降低,含水率降低;相同固含量下,Al粉的引入会增加辊面物料的温度,使压延样品含水率略有降低;固含量越高,模拟料的黏度越大,且含Al样品黏度大于不含Al样品;SEM测试及煅烧实验表明物料分布均匀且混合良好;体系的塑化度随固含量增加而降低,受固体组成影响较小。对于高固含量特别是含Al粉推进剂,建议适当降低压延温度。更多还原

【Abstract】 In order to understand the characteristics of continuous shear calendering process for modified double-base propellant with high solid content, a high-solid substitute material with solid filler mass fraction of 30%-50% was used for the experiment. The state of the material, temperature distribution and water content of the simulated materials were studied. And the micromixing effect and the degree of plasticization were tested by SEM and DSC, respectively. The results show that with the increase of solid content, it becomes worse for the material sticking to the roll at the feed part, but better on the rear part. Meanwhile, the temperature of the roll surface and the water content decrease. Under the same solid content, the introduction of Al powder will increase the temperature of the material on the roll surface and make the water content of the sample decrease slightly. The higher the solid content, the greater the viscosity of the simulated material. And the viscosity of samples containing Al is greater than that without Al. SEM test and calcination test show that the materials are evenly distributed and mixed well. The plasticization degree of the system decreases with the increase of solid content, and is slightly affected by the solid composition. For propellants with high solid content, especially containing Al powder, it is recommended to reduce the calendering temperature appropriately.更多还原