Toughened lamination composite material and preparation method thereof

Abstract

The invention provides a toughened lamination composite material and a preparation method of the toughened laminated composite material. The lamination composite material comprises a traditional carbon fiber lamination composite material and flexible foam body thin layers intercalated among layers of the traditional carbon fiber lamination composite material, specifically, the foam body thin layers with certain volume density and thickness as well as large openings and high aperture ratio are adopted as the toughened lamination composite material with inserted layers, the foam body thin layers with openings are intercalated among carbon fiber paving layers, under high forming pressure, the flexible foam body thin layers are compacted to achieve the density and thickness required for interlayer toughening, and finally the toughened composite material is obtained under resin forming and curing processes. According to the invention, the structure of the flexible foam body still has continuity and is distributed vertical to the interlayer direction, thus the lamination composite material with excellent toughness is obtained, and in addition, the permeability of the foam body can not influence the flow of resin in the forming process.

Description

technical field [0001] The invention belongs to the technical field of toughening composite materials, and relates to a toughened laminated composite material and a preparation method thereof. Background technique [0002] Continuous carbon fiber reinforced resin-based laminated composites are increasingly used in aircraft main structure materials, such as A380 and B787, which use a large number of composite materials. However, the low-speed impact resistance of this material and the resulting hail impact resistance have also been questioned. At home and abroad, a lot of research has been done on the toughening of laminated composite materials. On the frontier of research, such as constructing fibers and carbon nanotube micro-nano hybrid structures, using molecular self-assembly technology to grow rigid rods for internal toughening of resins, doping Heterocarbon nanomaterials. However, these methods are only suitable for basic research, and there will always be problems in...

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Problems solved by technology

For example, the "off-site" toughening technology developed by CN101220561 puts thermoplastic resin between the fiber layers, and under the process conditions, the resin dissolves and then phase-separates to form a multi-phase structure. After curing and molding, the layers are multi-layered. The multi-phase toughening phase structure does not reduce other mechanical properties, and increases the compressed impact strength (CAI) of the composite material by more than 100%, but the solubility requirements for thermoplastic resins are relatively strict. If thermoplastic resins have certain solubility in thermosetting resins In the process of glue injection, it will lead to thickening, difficulty in flow and uneven dispersion by washing; for example, WO9009410-A, etc., add dispersible particles into the interlayer for toughening, but the particle structure and shape after adding dispersible thermoplastic particles The appearance is almost unchanged, but the dispersed particles are not easy to adhere to the surface of the carbon fiber fabric and are prone to dust pollution; another practical method is to add materials such as nylon non-woven fabrics between the layers, which can make the interlayer of the composite material Fracture toughness and CAI have been greatly improved, but the fibers of non-woven fabrics tend to be distributed between layers, which is not conducive to the improvement of interlayer fracture toughness in principle; patent 201110376947.9 proposes a method using poly The imide foam precursor foams between layers and builds a three-dimensional continuous structure of toughened substances, but this method requires high temperature treatment to convert the polyimide foam precursor into polyimide during foaming , which is not conducive to the actual production process