双螺杆捏合方式制备的三基发射药的流变性研究OA北大核心

In order to understand rheological properties of tri-base gun propellants in the continuous kneading process and improve the accuracy of the process model,a kind of pre-mixed propellant was prepared according to the formula of the tri-base gun propellant substitute.The pre-mixed propellant was kneaded using a twin-screw extruder,and rheological properties of the kneaded propellant were tested by the special double-barrel capillary rheometer.Screw speed and kneading temperature of the twin-screw extruder,the solid content and solvent ratio of the propellant were changed to analyze the influence of these variables on rheological parameters of the tri-base gun propellant.The results show that after twin-screw kneading,the constitutive equation of the tested material fits well with Carreau-Yasuada constitutive model.Within a certain range,an increase in screw speed or kneading temperature will reduce the shear viscosity of the kneaded material.At the same time,increasing the screw speed will reduce the residence time of the material,and the excessively short residence time will lead to an increase in the viscosity of the kneaded material.An increase in solid content or a decrease in solvent ratio will increase the shear viscosity of the kneaded material,and an increase in viscosity will lead to an increase in the residence time of the material.To a certain extent,it can enable the material to be more thoroughly kneaded.