干法缠绕用碳纤维增强环氧树脂预浸纱线的设计及其性能研究

Design and performance research of carbon fiber reinforced epoxy resin prepreg tow for dry filament winding

干法缠绕能有效提高复合材料制品的质量稳定性,是目前复合材料制备的研究重点之一。本文开发了一种适用于干法缠绕的环氧树脂体系,并采用热熔法制备出可室温储存的预浸纱线。通过对环氧树脂工艺性能、力学性能、玻璃化转变温度和非等温流变曲线的研究,确定了树脂体系的组分配方。与此同时,系统地研究了预浸纱线的室温储存性能。研究结果表明,所开发的最优环氧树脂体系在满足干法缠绕工艺性能的同时具有优异的力学性能,拉伸强度为69 MPa,弯曲强度为109 MPa,断裂韧性与冲击强度分别为1.36 MPa·m^(1/2)和42.8 kJ/m^(2)。由该环氧树脂体系制备的预浸纱线的储存稳定性良好。在室温储存60 d后,预浸纱线的工艺性能及环氧树脂的力学性能没有发生明显变化。

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/m^(2),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.