Toughened and modified epoxy resin composition, composite material and preparation method thereof

The invention provides a toughened and modified epoxy resin composition, a composite material and a preparation method thereof, and the epoxy resin composition comprises the following components in parts by mass: 100 parts of epoxy resin, 2-20 parts of SiO2-polysulfone microspheres with core-shell structures, and 20-25 parts of a curing agent. According to the toughened and modified epoxy resin composition and composite material disclosed by the invention, the epoxy resin is toughened by adding the SiO2-polysulfone microspheres with core-shell structures, the toughness of the epoxy resin can be improved by the thermoplastic resin polysulfone and the rigid inorganic nanoparticles SiO2, the inorganic nanoparticles SiO2 can also make up for the defects that the rigidity of the resin is reduced and the like due to the addition of the polysulfone, and meanwhile, the toughness of the epoxy resin is improved. According to the present invention, the core layer nano SiO2 is coated with the shell layer material polysul