▎ 摘　　要

NOVELTY - Preparing lightweight wave-absorbing sound-absorbing foam, comprises e.g. using melamine, paraformaldehyde solution, modified monomers and water as main raw materials, adding the main raw materials into a reactor, then adding sodium hydroxide solution, heating with steam, cooling with cold water to obtain reaction solution, adding fine metal powder, stirring, adding carbon-based wave-absorbing materials, and reacting to obtain functionalized resin prepolymer, adding emulsifier, curing agent, foaming agent and heat conduction solvent into the reactor, stirring to obtain auxiliary agent, cooling the functionalized resin prepolymer through a single screw, and placing in a twin-screw machine, placing the auxiliary agent in the machine with the functionalized resin prepolymer, mixing the prepolymer and auxiliary agent in the machine for high-speed emulsification, and placing the material after emulsification in continuous hot air furnace for foaming to obtain final product. USE - The method is useful in preparing lightweight wave-absorbing sound-absorbing foam. ADVANTAGE - The method: can prepare foam with high degree of magnetization and strong electrical conductivity. DETAILED DESCRIPTION - Preparing lightweight wave-absorbing sound-absorbing foam, comprises (1a) using 40-60 pts. wt. melamine, 25-50 pts. wt. paraformaldehyde solution with a concentration of 37 wt.%, 0.1-3 pts. wt. modified monomers and 15-35 pts. wt. water as main raw materials, (1b) adding the main raw materials into a reactor, then adding sodium hydroxide solution to adjusting the pH to 8-9, heating with steam, and maintaining the temperature at 80-100℃ for 1-3 hours, (1c) cooling with cold water to obtain reaction solution, and maintaining the temperature at 60-90℃, using triethanolamine to adjusting the pH to 7-8, adding fine metal powder, and continuing to stirring and reacting at 60-90℃ for 20-60 minutes, and (1d) cooling to 20-40℃, then adding carbon-based wave-absorbing materials, and stirring and reacting for 1-3 hours to obtain functionalized resin prepolymer, (2) adding 25-35 pts. wt. emulsifier, 30-40 pts. wt. curing agent, 40-55 pts. wt. foaming agent and 30-40 pts. wt. heat conduction solvent into the reactor, mixing and stirring, and then stirring at slow speed to obtain auxiliary agent, (3) cooling the functionalized resin prepolymer obtained in step (1) to 0℃ through a single screw, and then placing in a twin-screw machine through a metering screw, and maintaining the flow rate of the metering screw to 1.5-2.5 Kg/minute, placing the auxiliary agent obtained in step (2) in the twin-screw machine with the functionalized resin prepolymer through metering pump, and maintaining the flow rate of the metering pump to 400-450 g/minute, mixing the functionalized resin prepolymer and auxiliary agent in the twin-screw machine for high-speed emulsification, and placing the material obtained after emulsification in continuous hot air furnace for foaming at 80-120℃ for 15-50 minutes to obtain final product, and (4) drying the final product with superheated steam to obtain the final product with stable performance.