Diaphragm for preparing nitrogen trifluoride by electrolyzing and melting ammonium bifluoride as well as preparation method and application of diaphragm

The invention provides a diaphragm for preparing nitrogen trifluoride by electrolyzing and melting ammonium bifluoride. The diaphragm comprises a polytetrafluoroethylene pore plate layer and an outer surface spraying layer sprayed on the outer surface of the polytetrafluoroethylene pore plate layer, the polytetrafluoroethylene pore plate layer comprises carbon fibers and PFA resin, the outer surface spraying layer comprises Nafion resin.The invention further provides a preparation method and application of the diaphragm, the diaphragm has the characteristics of being high in strength and good in ion permeability, bubbles are difficult to permeate, and after the diaphragm is applied to an electrolysis process for preparing nitrogen trifluoride through electrolysis and melting of ammonium hydrogen fluoride, the nitrogen trifluoride can be effectively separated from the diaphragm, and the service life of the diaphragm is prolonged. And the capacity of preparing nitrogen trifluoride by electrolyzing and melting a