Damage tolerant structural composites comprising high strength filaments in the form of bundles or tows of continuous fiber and a crosslinked epoxy resin matrix are disclosed. The invention, more particularly relates to improvements in the crosslinked epoxy resin matrix which provide the structural composites with high post impact compressive strength while maintaining such other desirable attributes of epoxy composites as good high temperature performance, solvent resistance and good processing characteristics. The crosslinked epoxy resin matrix contains infusible particles that reside primarily between plies of the composite and have a median particle size between 5 - 75 microns. Prepregs for making the damage tolerant composites and methods of making such prepregs and the epoxy resin compositions thereof are also disclosed. The epoxy resin compositions contain the infusible particles which become segregated as to size on a surface layer of the prepreg during the process of combining the high strength filaments of the prepreg and the resin containing the epoxy resin composition. Alternatively, the infusible particles may be disposed directly on the epoxy resin surface of the prepreg.
本发明公开了由连续纤维束或纤维束形式的高强度长丝和交联环氧
树脂基体组成的耐损伤结构复合材料。本发明尤其涉及对交联环氧
树脂基体的改进,使结构复合材料具有较高的冲击后抗压强度,同时保持环氧
树脂复合材料的其他理想特性,如良好的高温性能、耐溶剂性和良好的加工特性。交联环氧
树脂基体含有可注入颗粒,这些颗粒主要位于复合材料的层间,中值粒径在 5 - 75 微米之间。此外,还公开了用于制造耐损伤复合材料的预浸料、制造此类预浸料的方法及其环氧
树脂组合物。环氧
树脂组合物中含有可注入颗粒,在将预浸料中的高强度长丝与含有环氧
树脂组合物的
树脂结合的过程中,这些可注入颗粒会在预浸料的表层上按尺寸分离。或者,可注入颗粒可以直接放置在预浸料的环氧
树脂表面。