热熔胶基推进剂的流变性能

The composite solid propellant containing polyurethane hot melt adhesive, aluminum powder and ammonium perchlorate was prepared via calendering method, its morphology and ingredients distribution were carried out by SEM and EDS, and the mechanical properties, density and mechanical sensitivity were characterized. The effects of plasticizer, shear rate and temperature on its viscosity were studied with HAAKE MARS. The results suggest that the polyurethane hot-melt adhesive thermoplastic composite propellant is a pseudoplastic fluid, which conforms to the Ostwald-de Wale model. Compared with pure hot melt adhesive, the high temperature viscosity of polyurethane hot melt adhesive-based composite propellant with plasticizer decreases from 4×10⁶Pa•s to 1.5×10⁶Pa•s, and the viscosity activation energy decreased from 41.53kJ/mol to 28.57kJ/mol. In addition, the viscosity of polyurethane hot-melt adhesion-based thermoplastic propellant decreases gradually with increasing the temperature and shear rate, and the viscosity activation energy of pure hot melt adhesion-based propellant decreases from 41.53kJ/mol to 31.20kJ/mol with an increase in shear rate.