连续碳纤维增强热固性酚醛树脂复合材料的3D打印工艺及性能研究

3D Printing Process and Properties of Continuous Carbon Fiber Reinforced Thermasetting Phenolic Resin Composites

针对连续碳纤维增强热固性酚醛树脂复合材料3D打印成型工艺的技术难题,本文提出了浸渍-原位预固化-后固化的3D打印成型方案,实现了连续碳纤维增强热固性酚醛树脂复合材料的3D打印成型,并研究浸渍温度对酚醛树脂接触角与表面张力,以及打印工艺对样件形貌和力学性能的影响规律。结果表明:当浸渍温度为40℃,预固化温度为180℃时,纤维-树脂界面结合效果最佳,原料具备成型条件;当打印间距为0.5 mm时,样件的弯曲强度及模量达到最大值,分别为660.00 MPa和57.99 GPa,层间剪切强度达到20.14 MPa。此连续碳纤维增强热固性酚醛树脂复合材料一体化制备工艺解决了3D打印热固性树脂原位成型难的问题,为制备具有复杂结构的连续纤维增强热固性树脂复合材料提供了参考。

In view of the technical difficulties in the 3D printing and molding process of continuous carbon fiber reinforced thermosetting phenolic resin(CCF-TSPR)composites,this paper proposes a 3D printing and molding scheme of impregnation,in-situ pre-curing and post-curing to realize 3D printing of continuous carbon fiber reinforced thermosetting phenolic resin composites.The influence of the immersion temperature on the contact angle and surface tension of the phenolic resin,as well as the printing process on the morphology and mechanical properties of the sample were studied.The results show that when the dipping temperature is 40℃and the pre-curing temperature is 180℃,the raw material is available for molding with optimal fiber-resin interface bonding.When the printing spacing is 0.5 mm,the bending strength and modulus of the sample reach the maximum values of 660.00 MPa and 57.99 GPa respectively,and the interlaminar shear strength reaches 20.14 MPa.This integrated preparation process of CCF-TSPR composites solves the difficulty of in-situ molding of 3D printing thermosetting resins,and provides a reference for the preparation of continuous fiber reinforced thermosetting resin composites with complex structures.