BMI树脂化学流变模型及RTM工艺窗口预报研究

RHEOLOGICAL MODEL AND PREDICTION OF PROCESSING WINDOWS OF BMI RESIN FOR RTM PROCESSES

研究用于航空结构复合材料的 RTM工艺专用双马来酰亚胺树脂 (BMI)体系化学流变特性 ,并建立其双阿累尼乌斯流变模型。模型对树脂粘度的模拟结果与实验结果具有良好的一致性。所建立的粘度模型可有效模拟该树脂在不同工艺条件下的粘度行为 ,准确预报树脂体系的低粘度工艺窗口 ,为优化

The chemorheological behaviors of bismaleimide resin (QY8911-4) for Resin Transfer Molding (RTM) were studied. A chemorheological model of the resin was developed based on dual-arrhenius equation. The estimated viscosity values of the established model are in good agreement with the experimental ones. The model was used to determine the critical low viscosity windows of the resin system for RTM processes. The optimum processing parameters of QY8911-4 resin for RTM are 100°C-110°C at which the viscosity of the resin will be less than 200 cP within 55 minutes. These parameters are essential for the manufacture of structure composites with high fiber content. The longer pot life of the resin also can be obtained with low working temperature between 90°C and 100°C, in which the viscosity of the resin can keep less than 800 cP. The developed model is important for processing simulation, parameter optimization and quality control for RTM processes.