低温高面密度碳纤维/环氧树脂预浸料真空成型固化工艺研究

Study on vacuum forming and curing process of low temperature high areal density carbon fiber/epoxy resin prepreg

为解决风电预浸料真空成型成本高、铺贴过程中存在褶皱鼓包、固化过程中厚度方向温度场不均匀等问题,对低温高面密度碳纤维/环氧树脂预浸料的真空袋成型工艺进行研究,制备碳纤维复合材料板材,研究固化温度和时间、升温速率、真空度对复合材料质量的影响。结果表明:采用95℃恒温120 min、升温速率小于或等于1℃/min固化工艺制备的≥20 mm超厚复合材料板,内部质量佳,可满足风电行业无损检测质量要求。采用低成本国产碳纤维和环氧树脂体系制备的预浸料可实现真空成型超厚制件制备,为新能源领域中的大型构件研制提供低成本材料解决方案。

In order to solve the problems such as high cost of vacuum forming of wind power prepreg,wrinkles and bulging in the laying process,and uneven temperature field in the thickness direction during curing,the vacuum bag forming process of low-temperature high areal density carbon fiber/epoxy resin prepreg was studied to prepare carbon fiber composite sheets,and the effects of curing temperature and time,heating rate and vacuum degree on the quality of composite materials were studied.The results show that the composite plates with thickness≥20 mm prepared by the curing process at 95℃for 120 min and the heating rate is less than or equal to 1℃/min have good internal quality and can meet the quality requirements of non-destructive testing in wind power industry.The prepreg prepared by low-cost domestic carbon fiber and epoxy resin system can achieve the preparation of vacuum forming large thickness parts,providing low-cost material solutions for the development of large components in the field of new energy.