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采用真空导入模塑工艺(VIMP)制备了85 mm厚玻璃纤维增强环氧树脂层合板,单面刚性模具加热固化,沿铺层厚度方向设置热电偶,进行了实时固化温度监测,发现固化时厚度方向存在明显的温度差异。通过DSC方法得到等温环氧树脂固化度-时间实验数据,建立了基于自催化反应模型的等温固化反应动力学方程,模型计算值和实验值符合良好;提出了时间离散分步计算法,对非等温固化条件下,厚度方向的固化度分布进行了计算。结果表明:固化过程中厚度方向固化度存在差异,短时间的后固化可以消除此差异。该方法可以模拟出由温度差异导致的固化度的不均匀分布,用于指导优化固化工艺。
A 85 mm thick glass fiber reinforced epoxy resin laminates were fabricated by vacuum insert molding (VIMP). One-side rigid molds were cured by heating and thermocouples were set along the thickness of the ply. The real-time curing temperature was monitored. The thickness There is a clear temperature difference in direction. The isothermal curing reaction kinetic equation based on autocatalytic reaction model was established by means of DSC method. The calculated values of the model were in good agreement with the experimental data. The time-discrete step-by-step calculation method was proposed, Isothermal curing conditions, the thickness of the curing degree distribution was calculated. The results show that there are differences in the degree of curing in the thickness direction after curing, and the short curing can eliminate this difference. This method simulates an inhomogeneous distribution of degree of cure caused by temperature differences, which is used to guide the optimization of the curing process.