In order to address the conflict between traditional casting molding and direct writing 3D printing in terms of the process performance of solid propellant slurry,the HTPB propellant slurry was modified through the addition of a small amount of setting agent(YJ)to enable the 3D printing of small propellant grain.To examine the of YJ on the propellant's properties,a comparison and analysis of the performance,mechanical performance,combustion performance,and performance of the pro-pellant was conducted before and after modification.The results indicate that the modified propellant slurry exhibits controllable extrusion and room temperature accumulation.The addition of YJ decreases the maximum tensile strength of the propellants by 0.1 and0.15 MPa at 20 and 70℃ respectively,and the elongation at break increases by 12.7％ and 9.9％ respectively.This evidence demonstrates that YJ significantly affects the mechanical properties of the propellants.Furthermore,both experi-mental and theoretical calculations indicate that YJ has minimal impact on the combustion and energy performance of the propel-lant.The burning rate is reduced by a maximum of 0.24mm/s,and the energy variation range is less than 1％.The addition of the setting agent(YJ)not only enables the slurry to meet the requirements for 3D printing but also has no significant the overall performance of the original propellant.
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