<p>Impact copolymer polypropylene (IPC) containing intrinsic elastomers has become a focal point of research due to its excellent mechanical properties, thermal stability, and insulation properties, positioning itself as a new generation of thermoplastic cable insulation material that can replace cross-linked polyethylene for high-voltage DC cable insulation. However, the development of cable semiconductive screen materials that complement IPC urgently needs to be addressed. This paper utilizes acrylamide as the grafting monomer to prepare graft-modified IPC base resin, aiming to improve the dispersion state of conductive filler carbon black in IPC screen materials. Electrostatic potential and weak interaction simulation results indicate that functional groups of both acrylamide and carbon black molecules possess strong electrostatic potentials, capable of generating electrostatic attraction, inducing dispersion of carbon black, and forming hydrogen bonds between acrylamide and carbon black molecules, thereby stabilizing the dispersion of carbon black. Experimental comparisons were made on the mesoscopic morphology, conductive properties, thermal properties, mechanical properties, and space charge and conductivity characteristics of the screen/insulation structure before and after grafting. The results demonstrate that the dispersion of conductive fillers is significantly enhanced after grafting with acrylamide, leading to notable reduction in the material’s bulk resistivity, thermal stability, mechanical properties, and charge emission characteristics.</p>