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以2400tex无捻玻纤粗纱为原料,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20%(wt,质量分数)的氢氧化钠溶液作为侵蚀液在60℃的温度下,以浸泡的方式对玻璃纤维预制体进行处理;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,通过真空灌注成型的方式制备出三维浅交弯联机织复合材料。采用原子力显微镜、万能材料试验机、扫描电镜等仪器来测试与验证氢氧化钠溶液对预制体的侵蚀效果及对复合材料力学性能的影响。结果表明:氢氧化钠溶液浸泡20min玻璃纤维后,玻璃纤维间产生了粘合作用,有利于提高复合材料力学性能,复合材料弯曲强度达到最大为602MPa;超过20min后,氢氧化钠溶液的侵蚀作用破坏了玻璃纤维的结构,影响了复合材料的力学性能。
Taking 2400tex non-twist glass fiber rovings as raw material, a three-dimensional shallow cross-jointed woven fabric preform was prepared on SGA598 three-dimensional loom. A 20% (wt, mass fraction) sodium hydroxide solution was used as an etching solution at 60 ℃, the glass fiber preform is treated by immersion; the resin system is composed of the epoxy resin E51 and the polyether amine WHR-H023 as the curing agent in a ratio of 3: 1 by vacuum infusion molding Prepared three-dimensional shallow intersection of woven fabric. Atomic force microscope, universal material testing machine and scanning electron microscope were used to test and verify the effect of sodium hydroxide solution on the preform and the effect on the mechanical properties of the composite. The results showed that after the glass fiber was soaked in sodium hydroxide solution for 20 min, the adhesion between the glass fibers was enhanced, which was beneficial to improve the mechanical properties of the composites. The flexural strength of the composites reached the maximum of 602 MPa. After 20 min, the erosion of the sodium hydroxide solution Destroyed the structure of glass fiber, affecting the mechanical properties of the composite.