According to the requirement for high-efficient production of high quality solid rocket motor shell

the epoxy resin formulation with different functionalities was studied by focusing on its formulation design and mechanical properties. The curing characteristic temperature

curing reaction kinetics and pot life were tested by DSC (differential scanning calorimetry) and viscosity test

respectively

the unidirectional laminates and NOL (the Naval Ordnance Laboratory) rings were prepared to test and analyze the properties of composites. The results showed that the epoxy resin with three functionalities can meet the requirements of high efficient wet winding. When the mass fraction of TDE-85 with three functionalities was 25%

the comprehensive properties reached the optimum

the tensile strength (973 MPa)

the bending strength (115 MPa) and the glass transition temperature (466 K) increased by 363%

159% and 258% respectively

while the applicable period was 120 min. The resin system had good adaptability to fibers

demonstrated by the excellent properties of composites

about 256 GPa in tensile strength and 744 MPa in interlaminar shear strength of the NOL rings

respectively. The utilization ratio of fiber strength reached 766%

demonstrating that the epoxy resin system was suitable for the wet winding process of the solid rocket motor.