Development and Properties of Temperature-resistant Epoxy System for Wet Winding
Wang Ming, Zheng Zhicai, Xiao Yachao, Chen Yan, Meng Xiangwu, Ge Linhai, Wang Zhizeng
Institute 53, China North Industries Group Corporation, Jinan 250031, China
摘要：针对碳纤维增强复合材料固体火箭发动机壳体耐温需求，研制了一种低黏度、耐温等级高且适用于湿法缠绕的环氧树脂体系，考察了树脂体系的黏度-时间特性，并采用热分析方法研究了树脂体系的固化反应动力学特征，确定了树脂体系固化制度，并对树脂浇注体玻璃化转变温度、力学性能进行了研究。结果表明，研制的环氧树脂体系室温黏度低于800 mPa·s，适用期大于10 h，树脂浇注体玻璃化转变温度达到217.4℃，拉伸强度、弯曲强度分别达到94，122 MPa。以研制的环氧树脂体系为基体树脂，进一步考察了国产T700S级碳纤维增强复合材料单向板力学性能以及Ø150 mm标准压力容器特性指数，结果显示复合材料单向板拉伸强度、弯曲强度分别达到2 720，2 010 MPa，Ø150 mm标准压力容器特性指数达到42.1 km，纤维强度转化率达85%以上。以上研究结果表明研制的树脂体系适用于湿法缠绕工艺，与国产T700S级碳纤维具有良好的浸润性、匹配性，能够有效发挥碳纤维力学性能。
Abstract：To meet the temperature resistance requirements of carbon fiber reinforced composite solid rocket motor case, an epoxy resin system with low viscosity and high temperature resistance grade was developed for wet winding. The viscosity-time characteristics of the resin system were investigated, and the curing reaction kinetics characteristics of the resin system were studied by thermal analysis, the curing system of the resin system was determined, also the glass transition temperature and mechanical properties of the resin casting body were studied. The results show that the room temperature viscosity of the epoxy resin is lower than 800 mPa·s, the applicable time is longer than 10 h, and the glass transition temperature of the resin casting body reaches 217.4℃, the tensile strength and bending strength reach 94 MPa and 122 MPa respectively. With the epoxy resin system as the matrix, the mechanical properties of domestic T700S carbon fiber reinforced composite unidirectional laminates and the characteristic index of domestic T700S carbon fiber reinforced ?150 mm standard pressure vessel were researched, the results show that the tensile strength and bending strength of the composite unidirectional laminates reach 2 720 MPa and 2 010 MPa respectively, the characteristic index of ?150 mm standard pressure vessel is 42.1 km, and the fiber strength conversion rate is more than 85%. The above results show that the developed resin system is suitable for wet winding process, and has good wettability and matching with domestic T700S carbon fiber, which can effectively exert the mechanical properties of carbon fiber.
Keywords：temperature resistance; curing characteristic; mechanical property; wet winding
Wang Ming，Zheng Zhicai，Xiao Yachao，et al. Development and properties of temperature-resistant epoxy system for wet winding[J]. Engineering Plastics Application，2022，50(11)：44-48.