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以2400tex无捻玻璃纤维粗纱为原料,在SGA598型三维织机上制备出一种三维浅交弯联机织复合材料预制体,以环氧树脂E51和固化剂聚醚胺WHR-H023以质量配合比3∶1的比例组成树脂体系,使用真空灌注成型的方法制备玻璃纤维/环氧树脂复合材料。真空灌注后,将模具与未固化成型的复合材料进行不同时长的预固化处理,制备出预固化工艺不同的三维浅交弯联机织复合材料。通过万能强力仪、扫描电子显微镜对该复合材料的弯曲力学性能及破坏断面微观形貌进行考察,分析不同的预固化工艺对复合材料界面及弯曲性能的影响。实验结果表明:当预固化时间为120min时,制得的复合材料弯曲强度达到675MPa,弯曲强度较传统恒温热固化工艺提高了75.8%,改善效果较为明显。
Taking 2400tex non-twisting glass fiber rovings as raw materials, a three-dimensional shallow cross-jointed woven fabric preform was prepared on a three-dimensional SGA598 three-dimensional loom. Epoxy resin E51 and polyether amine WHR-H023 were mixed in mass ratio 3 : 1 ratio resin composition system, the use of vacuum infusion molding method of preparing glass fiber / epoxy composite material. After the vacuum infusion, the mold and the uncured composite material are pre-cured at different times to prepare a three-dimensional shallow cross-jointed woven composite material with different pre-curing processes. The mechanical properties of the composites were investigated by scanning electron microscopy (SEM) and scanning electron microscopy (SEM). The microstructures of the composites were investigated. The effects of different precure processes on the interface and flexural properties of the composites were analyzed. The experimental results show that when the pre-curing time is 120min, the bending strength of the obtained composite material reaches 675MPa, the bending strength is improved by 75.8% compared with the conventional thermostatic thermal curing process, and the improvement effect is obvious.