Method for manufacturing a composite part reinforced with nanotubes

A method for manufacturing a composite part reinforced with nanotubes, said method comprising a stacking step that includes stacking a plurality of composite plies of prepreg and at least one composite ply integrating nanotubes, said at least one composite ply integrating nanotubes being positioned in an inter-ply space between two composite plies of prepreg, wherein said at least one composite ply integrating nanotubes is a ply having a thermoplastic component, said nanotubes being integrated in said thermoplastic component, the method including a step of manufacturing said composite ply integrating nanotubes that comprises:

• a sub-step of extruding a mixture resulting from a mixing sub-step through a die dimensioned to obtain filaments of thermoplastic polymer filled with nanotubes;
• a sub-step of melting and blow forming said filaments of thermoplastic polymer filled with nanotubes and without using a chemical binder,
• said at least one composite ply integrating nanotubes integrates multiwalled carbon nanotubes and is a web of thermoplastic fibres, said nanotubes being integrated in said thermoplastic fibres and the web of thermoplastic fibres has a weight per unit area comprised between 15 g/m2 and 100 g/m2.