预浸料在固化前的外置老化会导致其理化、工艺、力学性能的变化。为研究国产T800级碳纤维增强TF2419环氧树脂预浸料的外置寿命,考察了2种储存环境下外置时间对预浸料固化反应程度和粘性的影响,使用预浸料制备了复合材料层压板,并对复合材料的物理和力学性能进行了测试。结果表明:室温环境[(23±3)℃、相对湿度(50±15)%]下外置1000h后,预浸料的固化度为28.3%,凝胶时间缩短、粘性下降;外置后进行固化的层压板仍具有高机械性能,复合材料玻璃化转变温度、短梁剪切强度与开孔压缩强度未发生明显变化。高温高湿环境[(27±3)℃、相对湿度(75±15)%]下,预浸料的老化速度明显加快,短梁剪切强度和开孔压缩强度下降明显,分别下降了68.2%和22.8%。
The external aging of prepregs before curing can lead to changes in their physicochemical,processing,and mechanical properties.In order to study the service life of domestic T800-grade carbon fiber-reinforced TF2419 epoxy resin prepregs,the influence of external aging time on the degree of curing reaction and tackiness of the prepregs under two storage environments was investigated.Composite laminates were prepared with the prepregs,and their physical and mechanical properties were tested.The results showed that after 1000h of outdoor exposure at room temperature environment [(23±3)℃,relative humidity (50±15)%],the curing degree of the prepreg reached 28.3%,and the gel time and viscosity were reduced.The laminates cured after external placement still maintained high mechanical properties,and the glass transition temperature,short-beam shear strength,and open-hole compressive strength of the composite material didn't show significant changes.Under the high-temperature and high-humidity environment [(27±3)℃,relative humidity (75±15)%],the aging rate of prepreg significantly accelerated.The short beam shear strength and open-hole compression strength decreased notably,by 68.2% and 22.8%,respectively.
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