真空辅助树脂灌注法制备风电叶片树脂的渗透及缺陷

Resin penetration and defects of wind turbine blades prepared by vacuum assisted resin infusion method

依据真空辅助树脂灌注(Vacuum assisted resin infusion,VARI)技术,对VARI方法制备玻璃纤维/环氧树脂复合材料风电叶片过程中树脂的渗透缺陷形成机制和消除方法进行了研究。结果表明,在环境温度为25℃和初始混合时间为100min、混合树脂黏度为250mPa·s时,树脂的放热温度和渗透性能最佳。导流介质的使用可以降低渗透难度,缩短充模时间。使用6层三轴玻璃纤维缝编织物,并插入一层连续毡做为导流介质,会使导流效果最佳,渗透效果趋于一致,有效的降低边缘效应对树脂渗透的影响。在L7000(叶根到进料口的距离为17cm)和L19000(叶根到进料口的距离为19cm)位置处增加树脂进料口,调整模具温度为28℃,可以减少渗透缺陷的形成。

According to the vacuum assisted resin infusion(VARI)technology,the formation mechanism and elim-ination method of the penetration and defects in the wind turbine blades of glass fiber/epoxy resin composites pre-pared by VARI method were studied.The results show that when the environment temperature is 25℃,the initial mixing time is 100min,and the viscosity of mixed resin is 250mPa·s,the exothermic temperature and permeability of the resin are the best.The use of flow guiding medium can decrease the difficulty of penetration and shorten the molding time.Through using triaxial glass fiber stitched fabric as 6layers and inserting a continuous felt as the flow guiding medium,the best flow guiding effect can be obtained,and the penetration effect will be consistent,which can effectively reduce the influence of edge effect on the penetration.The penetration and defects can be reduced by increasing the feed port position of resin in L7000(from the blade root to the feed port at 17cm)and L19000(from the blade root to the feed port at 19cm),and adjusting the mold temperature to 28℃.