Abstract: Dry filament winding can effectively improve the quality stability of composite products, which is one of the research focuses of composite material preparation. In this paper, we develop an epoxy resin system that is suitable for prepreg tow. Then, prepreg tow which can be stored at room temperature is prepared by hot melt method. Through the study of epoxy resin's process performance, mechanical properties, glass transition temperature and non-isothermal rheological curve, the formula was determined. In the meanwhile, storage performance at room temperature of the prepreg tow made of this resin system was systematically studied. The research results show that the optimal epoxy resin system has excellent processing performance and mechanical properties at the same time. Its tensile strength is 109 MPa and its flexural strength is 69 MPa, fracture toughness and impact strength are 1.36 MPa·m^1/2 and 42.8 kJ/m², respectively. In addition, the storage stability of the prepreg tow made of the epoxy resin system is excellent. After 60 days of storage at room temperature, process performance and mechanical properties of the prepreg tow's epoxy resin is maintained at a relatively stable level.

Key words: dry filament winding, prepreg tow, epoxy resin, mechanical performance, storage stability, composites