▎ 摘　　要

NOVELTY - Preparing polypyrrole/polyurea with electromagnetic shielding efficiency comprises (i) mixing diisocyanate, non-ionic polyester diol and polyetheramine 2000, dripping catalyst, adding metered small molecular weight diamine for chain extension, reacting, and adding ethylenediamine ethanesulfonic acid sodium salt to react to obtain polyurea component, (ii) heating polyurea component, adding solvent, adding pyrrole to react, cooling, adding deionized water, adding ferric chloride solution in pyrrole, and obtaining polypyrrole/polyurea aqueous emulsion, (iii) dissolving quantitative polyvinylpyrrolidone in glycerol, adding silver nitrate, sodium chloride, water, glycerol mixture, heating, adding deionized water, centrifuging and washing to obtain silver nanowires, and (iv) taking polypyrrole/polyurea aqueous solution, and silver nanowire prepared by graphene, ultrasonically treating mixture, and drying to prepare polypyrrole/polyurea coating with electromagnetic shielding function. USE - The method is useful for preparing polypyrrole/polyurea with electromagnetic shielding efficiency used in high molecular material comprising but are not limited to electronic device, electric appliance device, leather and textile. ADVANTAGE - The coating: has specific electrical conductivity and excellent electromagnetic shielding performance, relatively high electrical conductivity, electromagnetic shielding performance, and application prospects in multiple applications. The method: prepares polypyrrole/polyurea aqueous solution with excellent dispersion stability; and depends on electrical conductivity and electromagnetic shielding properties of silver nanowires and graphene, film-forming properties of polyurea, and the stability of polypyrrole. DETAILED DESCRIPTION - Preparing polypyrrole/polyurea with electromagnetic shielding efficiency comprises (i) mixing diisocyanate, non-ionic polyester diol and polyetheramine 2000 in a metering ratio, dripping catalyst, reacting under high temperature nitrogen, then adding metered small molecular weight diamine to carry out chain extension, reacting at high temperature, and adding metered ratio of ethylenediamine ethanesulfonic acid sodium salt to react to obtain polyurea component, (ii) heating and reacting polyurea component prepared in the step (i), adding solvent to reduce viscosity of emulsion, adding metered amount of pyrrole to react at high temperature, cooling to room temperature, adding deionized water, stirring at high speed, placing reaction in ice-water bath, adding ferric chloride solution in an equal mol amount of pyrrole, and reacting under acidic conditions to obtain a polypyrrole/polyurea aqueous emulsion, (iii) dissolving quantitative polyvinylpyrrolidone in glycerol, stirring at high temperature until dissolved, cooling, adding silver nitrate, sodium chloride, water, glycerol mixture, heating and stirring, then cooling, adding deionized water and allowing to stand, centrifuging and washing to finally obtain silver nanowires, and (iv) taking polypyrrole/polyurea aqueous solution obtained in the step (ii), and taking silver nanowire prepared by graphene and in step (iii) simultaneously, ultrasonically treating the mixture, pouring into mold, and drying in an oven to prepare polypyrrole/polyurea coating with electromagnetic shielding function.