▎ 摘　　要

NOVELTY - Graphene/carbon nanotube composite electromagnetic shielding paper comprises 100 pts. wt. polyurethane resin, 10-75 pts. wt. graphene, 5-50 pts. wt. carbon nanotubes, 20-100 pts. wt. silane coupling agent, 8-40 pts. wt. deionized water, 72-360 pts. wt. ethanol and 3-6 pts. wt. surfactant. The graphene and the carbon nanotube are surface-modified by the silane coupling agent and dispersed in the polyurethane resin matrix, and a dense and uniform conductive film is formed on the surface of the cotton fiber paper by the film-forming method. USE - Used as graphene/carbon nanotube composite electromagnetic shielding paper. ADVANTAGE - The graphene/carbon nanotube composite electromagnetic shielding paper has high shielding effectiveness and frequency bandwidth, light weight, ultra-thinness and softness, and simple preparation process, low cost and easy realization of large-scale production. It provides a solution to solve the electromagnetic compatibility problem of portable electronic products. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing graphene/carbon nanotube composite electromagnetic shielding paper, comprising (i) mechanically stirring and mixing silane coupling agent, deionized water, ethanol to obtain a silane coupling agent dispersion; (ii) adding graphene and carbon nanotubes into the silane coupling agent dispersion, heating and stirring for 12 hours, vacuum filtering the mixture, washing with ethanol and drying to obtain modified graphene/carbon nanotube mixture; (iii) adding the modified graphene/carbon nanotube mixture and surfactant into a certain solid content aqueous polyurethane emulsion, ultrasonically dispersing and high-speed shear dispersing, to obtain graphene/carbon nano tube composite conductive coating; (iv) dipping the experimental cotton fiber paper into the graphene/carbon nanotube composite conductive coating, pulling into a film, and drying to obtain a single layer impregnated electromagnetic shielding paper; and (v) repeating step (iv).