▎ 摘　　要

NOVELTY - Preparing a polyamide-based conductive composite by in-situ polymerization involves putting caprolactam monomer and ring-opening initiator aminocaproic acid into reactor according to mass ratio of 90:10, passing high-purity N2, and heating it under normal pressure until the monomer melts. The conductive filler modified by the coupling agent is added to stainless steel polymerization reactor according to 40-60 wt.% of mass of caprolactam monomer, pressure in reactor is adjusted to 120Pa, and initial reaction temperature is controlled at 220 degrees C to carry out polymerization reaction for 1 hour, and then reaction temperature is controlled at 260 degrees C for 4 hours to obtain reacted product. The reacted product is subjected to cooling, crystallization, centrifugal separation, washing, and filtering to obtain polyamide 6 conductive particles. The polyamide 6 conductive particles, antioxidant and lubricant are mixed uniformly in a mass ratio of 98:0.5:1.5. USE - Method for preparing a polyamide-based conductive composite by in-situ polymerization used for preparing an anti-static and electromagnetic shielding in electronic appliances and living goods. ADVANTAGE - The method enables to prepare a polyamide-based conductive composite by in-situ polymerization, which has good electrical conductivity and mechanical strength. DETAILED DESCRIPTION - Preparing a polyamide-based conductive composite by in-situ polymerization involves putting caprolactam monomer and ring-opening initiator aminocaproic acid into reactor according to mass ratio of 90:10, passing high-purity N2, and heating it under normal pressure until the monomer melts. The conductive filler modified by the coupling agent is added to stainless steel polymerization reactor according to 40-60 wt.% of mass of caprolactam monomer, pressure in reactor is adjusted to 120Pa, and initial reaction temperature is controlled at 220 degrees C to carry out polymerization reaction for 1 hour, and then reaction temperature is controlled at 260 degrees C for 4 hours to obtain reacted product. The reacted product is subjected to cooling, crystallization, centrifugal separation, washing, and filtering to obtain polyamide 6 conductive particles. The polyamide 6 conductive particles, antioxidant and lubricant are mixed uniformly in a mass ratio of 98:0.5:1.5, added to single-screw extruder, melted and mixed to obtain mixed pellets, where temperature of pellet and barrel is controlled at 210-240 degrees C, and vacuum device is kept open to obtain final product.