Abstract: A method for preparing a fiber composite material toughened by nano-particles, comprising: first dispersing agglomerated nano-particles uniformly in a low-viscosity, volatile dispersant by ultrasonic and micro-jet treatment (two-stage dispersion), and spraying the dispersant containing nano-particles uniformly on the fiber fabric through a high-pressure spray gun; after the liquid is removed from the fiber fabric, subjecting the nano-modified fiber fabric and resin to composite molding. The method provided by the present application is simple to operate, can be scaled up, and does not change the original manufacturing process of the fiber composite material. Moreover, the method provided by the present application requires only a very small amount of toughening components to achieve a significant increase in the interlaminar fracture toughness of the composite, which has great application prospects.

Abstract: The application provides a fiber composite material reinforced and toughened by long-short carbon nanotubes and preparation method thereof, comprising: a) mixing a short carbon nanotube, a thermoset resin and an additive, to obtain resin matrix slurry; b) pouring the resin matrix slurry into a fiber preform and curing-molding, to obtain the fiber composite material reinforced and toughened by long-short carbon nanotubes; the short carbon nanotube has a length of 0.5-3 ?m and an average length of ?2 ?m; and the long carbon nanotube has a length of 50-1000 ?m. The present disclosure optimizes the spatial layout of long and short carbon nanotubes in the composite material, simultaneously achieving the dual purposes of the intralaminar reinforcement and the interlaminar toughening of the fiber composite material.

Abstract: The present invention relates to the technical field of composite materials, and in particular to a fiber composite material and a preparation method thereof. The preparation method comprises: A) uniformly dispersing nanoparticles in a solvent to obtain a nanoparticle dispersion; B) uniformly spray-coating the nanoparticle dispersion on a chopped fiber nonwoven fabric, and drying the fabric to obtain a nano-modified chopped fiber nonwoven fabric; C) intercalating the nano-modified chopped fiber nonwoven fabric between fiber preforms, and subjecting the obtained material and a resin matrix to composite molding by a molding process to obtain a fiber composite material. In the present invention, firstly nanoparticles are uniformly dispersed in a solvent to obtain a nanoparticle dispersion; secondly, the chopped fiber and the nanoparticles cooperate to construct a multi-scale interlaminar toughening phase, which significantly improves the interlaminar fracture toughness of the fiber composite material.