Composite material having a very low content of carbon-based nanofillers, process for the preparation thereof and uses thereof

Process for the preparation of a composite material comprising a polymeric composition and carbon-based nanofillers, chosen from carbon nanotubes, carbon nanofibres, graphene or a mixture of these in all proportions, comprising the following stages:

• a) the introduction into and then kneading in a compounding device of a masterbatch concentrated in carbon-based nanofillers, with a polymeric matrix, in order to obtain a precomposite comprising from 0.25% to 3% by mass of carbon-based nanofillers;
• b) optionally the conversion of the precomposite in the agglomerated solid form;
• c) the introduction of the precomposite into a polymer matrix including at least one polymer chosen from a thermoplastic polymer, alone or as a blend with an elastomer resin base, in order to obtain a composite material.

A method for improving the mechanical properties of a polymer matrix including at least one polymer chosen from a thermoplastic polymer, alone or as a blend with an elastomer resin base, while facilitating the forming thereof into composite parts according to any appropriate technique, and while improving its electrostatic dissipation capacity during the production of these composite parts, the method comprising using a carbon-based nanofillers, the carbon-based nanofiller chosen from carbon nanotubes, carbon nanofibres, graphene or a mixture of these in all proportions, in the polymer matrix, wherein the content of the carbon-based nanofillers is between 0.1 ppm and 99 ppm.