▎ 摘　　要

NOVELTY - A polyolefin elastomer-based 3D printing of porous electromagnetic shielding product involves (s1) preparing 75-95 pts. wt. polyolefin elastomer powder and 5-25 pts. wt. electromagnetic shielding carbon filler as raw materials, and coating the carbon filler on a powder surface of the polyolefin elastomer powder by powder surface coating treatment to obtain a composite powder in which the surface is coated with the carbon filler, or uniformly mixing the polyolefin elastomer powder with the carbon filler to uniformly disperse the carbon filler in the polyolefin elastomer powder and form the composite powder, (s2) extruding and processing the composite powder to obtain 3D printing filaments, and (s3) adding the 3D printing filaments into a melt deposition forming 3D printer, and preparing the porous electromagnetic shielding product through melt deposition forming 3D printing technology. In the extrusion processing, the extruding speed is 10-20 rpm. USE - Polyolefin elastomer-based three-dimensional printing of porous electromagnetic shielding product (claimed). ADVANTAGE - The method ensures continuous automatic processing, short production period, multi-scale and multi-structure products, and high customization degree. The electromagnetic shielding product satisfies the requirements of electromagnetic shielding and heat dissipation, and has low apparent density and enhanced heat dissipation due to its unique porous structure, thus improving the electromagnetic shielding per unit thickness-density performance. DETAILED DESCRIPTION - A polyolefin elastomer-based 3D printing of porous electromagnetic shielding product involves (s1) preparing 75-95 pts. wt. polyolefin elastomer powder and 5-25 pts. wt. electromagnetic shielding carbon filler as raw materials, and coating the carbon filler on a powder surface of the polyolefin elastomer powder by powder surface coating treatment to obtain a composite powder in which the surface is coated with the carbon filler, or uniformly mixing the polyolefin elastomer powder with the carbon filler to uniformly disperse the carbon filler in the polyolefin elastomer powder and form the composite powder, (s2) extruding and processing the composite powder to obtain 3D printing filaments, and (s3) adding the 3D printing filaments into a melt deposition forming 3D printer, and preparing the porous electromagnetic shielding product through melt deposition forming 3D printing technology. In the extrusion processing, the extruding temperature is 10-50℃ higher than the melting temperature of the polyolefin elastomer powder, and the extruding speed is 10-20 rpm. The melt deposition forming 3D printing technology involves slicing according to 3D digital model of the needed piezoelectric product, setting the filling mode of the extruding filament to print along a straight line, setting the inner filling angle to 0°/90° for stacking and accumulation, the inner filling density to 45-60% and the nozzle diameter to 1.0±0.01 mm, making the printing nozzle temperature consistent with the extruding temperature, and setting the hot bed temperature to 50-60℃ and the printing speed to 250-350 mm/minute.