风电叶片用环氧树脂固化动力学与玻璃化转变温度分析

Anylysis on curing kinetics and glass transition temperature of epoxy resin for wind turbine blades

采用示差扫描量热法(DSC)研究了风电叶片用灌注环氧树脂体系的固化动力学和玻璃化转变温度。利用模型法拟合得出符合树脂体系固化过程的自催化模型,并通过外推法确定了固化工艺温度,此外,对环氧树脂体系进行70℃等温DSC固化,并将固化动力学方程使用四阶Runge-Kutta法积分,验证了自催化模型的准确性。通过二次动态DSC扫描对该树脂体系玻璃化转变温度进行表征,并利用Dibenedetto方程拟合,得到与文献相符的拟合参数λ=0.49。本工作完善了对风电叶片用环氧树脂体系固化过程的研究,对进一步仿真预测风电叶片制造过程中固化变形和残余应力具有重要的指导意义。

Differential scanning calorimetry(DSC)was used to study the curing kinetics and glass transition temperature of the infused epoxy resin system for wind turbine blades. The curing kinetics of epoxy resin were studied through non-isothermal DSC,then the model method was used to fit the autocatalytic model in the curing process of the resin system and the curing process temperature was determined through extrapolation. In addition,isothermal DSC test at 70 ℃ was carried out for the epoxy resin system, and the curing kinetic equation was integrated using the fourth-order Runge-Kutta method to verify the accuracy of the autocatalytic model. The glass transition temperature of the resin system was characterized by secondary dynamic DSC scanning, and fitted with the Dibenedetto equation to obtain the fitting parameters consistent with the literature λ = 0.49. This work has improved the research on the curing process of epoxy resin systems for wind turbine blades,and has important guiding significance for further simulation and prediction of process-induced deformation and residual stress during the manufacturing process of wind turbine blades.