▎ 摘　　要

NOVELTY - Graphene composite light-weight multi-layer thin film absorbing material comprises microfiber cloth flame retardant layer, a polyurethane wave absorbing layer and a silicone wave absorbing layer from the bottom to top. The microfiber cloth flame retardant layer is 0.5-3mm, the polyurethane wave absorbing layer is 0.03-0.06mm, and the silicone wave absorbing layer is 0. 03-0.06mm. The polyurethane wave absorbing layer includes 0.1-5 pts. wt. graphene, 0.1-5 pts. wt. carbon fiber, 0.1-5 pts. wt. carbon black, 0.1-0.3 pts. wt. defoamer, and 30-50 pts. wt. polyurethane, 20-40 pts. wt. silica gel, and 0.3-0.6 pts. wt. silicone vulcanizing agent. The bonding is between flame retardant layer of microfiber cloth and polyurethane wave absorbing layer, and polyurethane wave absorbing layer and silicone wave absorbing layer. USE - Graphene composite light-weight multi-layer thin film absorbing material. ADVANTAGE - The graphene composite light-weight multi-layer thin film absorbing material is lightweight with a wide frequency band and high X+Ku band performance. DETAILED DESCRIPTION - Graphene composite light-weight multi-layer thin film absorbing material comprises microfiber cloth flame retardant layer, a polyurethane wave absorbing layer and a silicone wave absorbing layer from the bottom to top. The microfiber cloth flame retardant layer is 0.5-3mm, the polyurethane wave absorbing layer is 0.03-0.06mm, and the silicone wave absorbing layer is 0. 03-0.06mm. The polyurethane wave absorbing layer includes 0.1-5 pts. wt. graphene, 0.1-5 pts. wt. carbon fiber, 0.1-5 pts. wt. carbon black, 0.1-0.3 pts. wt. defoamer, and 30-50 pts. wt. polyurethane, 20-40 pts. wt. silica gel, and 0.3-0.6 pts. wt. silicone vulcanizing agent. The bonding is between flame retardant layer of microfiber cloth and polyurethane wave absorbing layer, and polyurethane wave absorbing layer and silicone wave absorbing layer. The adhesive layer includes 80-100 pts. wt. modified silica sol emulsion, 2-5 pts. wt. nano material dispersant, 1-2 pts. wt. silicone hydrophobic agent, 30-50 pts. wt. silica nano aerogel, and 20-30 pts. wt. hollow glass beads. An INDEPENDENT CLAIM is included for a method for preparing a graphene composite light-weight multi-layer film absorber, which involves: (A) adding polyurethane into mixed solvent, stirring in reaction kettle until transparent paste-like polyurethane adhesive, taking carbon black and dilute with mixed solvent, adding to polyurethane adhesive, and adding defoamer, standing still after stirring; (B) adding carbon fiber and graphene to the liquid after standing, stirring with glass rod, putting into an electric mixer and stirring uniformly for 8-15 minutes, putting prepared coating material into the coating machine; (C) applying 0.03-0.06mm on the release paper, applying carbon fiber along the length of the release paper, and the carbon fiber density is 0.002-0.005g/cm2, coating, putting in a drying tunnel at 85-100 degrees C to dry into polyurethane film rolls; (D) adding silica gel, carbon fiber, graphene, carbon black to the mixer, adding 2/3 vulcanizing agent and stirring, mixing for 10-20 minutes and sending to the mixer, adding 1/3 vulcanizing agent, where mixing temperature is 118-125 degrees C, the mixing time is 8-15 minutes, and the mixing is opened for 30-40 minutes, and coating mixing output with 0.03-0.06mm on the release paper, direction of coating the carbon fiber is along the width of the release paper and the carbon fiber density is 0.002-0.005g / cm2, and drying in a drying tunnel at 85-100 degrees C to make a silicone film roll; (E) pre-mixing modified silica sol emulsion, nano-material dispersant and silicone hydrophobic agent in the mixer for 5 minutes, adding hollow glass microspheres, silica nano aerogel, and stirring at 100 revolution per minute at speed of 10 minutes to obtain an adhesive; (F) die-cutting the two kinds of film rolls to standard size sheets, superimposing the carbon fiber orientations in the two sheets perpendicular to each other, and then putting into the molding machine and super-fiber cloth to compound; and (G) coating microfiber cloth and polyurethane film, polyurethane film and silicone film with adhesive, the thickness of the adhesive is 0.015-0.02mm, the compression pressure of the molding machine is 30-35 Mega Pascals, the temperature is 178-185 degrees C, the time is 30-50 seconds to obtain thin film absorbing material.