Ion exchange membrane, method for producing ion exchange membrane and electrolyzer

Abstract

An ion exchange membrane, a method for producing an ion exchange membrane, and an electrolyzer that enable a reduction in the electrolytic voltage when subjected to electrolysis are provided which have small influence of impurities in the electrolyte on electrolysis performance, and exert stable electrolysis performance. An ion exchange membrane includes a membrane main body containing a fluorine-containing polymer having an ion exchange group; and a coating layer arranged on at least one face of the membrane main body. The coating layer includes inorganic particles and a binder, a mass ratio of the binder to the total mass of the inorganic particles and the binder in the coating layer is 0.3 or more and 0.9 or less, and a coverage of the membrane main body with the coating layer is 50% or more.

1 . An ion exchange membrane comprising:
 a membrane main body comprising a fluorine-containing polymer having an ion exchange group; and   a coating layer arranged on at least one face of the membrane main body;   wherein the coating layer comprises inorganic particles and a binder,   a mass ratio of the binder to a total mass of the inorganic particles and the binder in the coating layer is 0.3 or more and 0.9 or less, and   a coverage of the membrane main body with the coating layer is 50% or more.   
     
     
         2 . The ion exchange membrane according to  claim 1 , wherein the inorganic particles are particles comprising at least one mineral selected from the group consisting of oxides of Periodic Table Group IV elements, nitrides of Periodic Table Group IV elements, and carbides of Periodic Table Group IV elements. 
     
     
         3 . The ion exchange membrane according to  claim 1 , wherein the inorganic particles are particles of zirconium oxide. 
     
     
         4 . The ion exchange membrane according to  claim 1 , wherein the binder comprises a fluorine-containing polymer. 
     
     
         5 . The ion exchange membrane according to  claim 1 , wherein the binder comprises a fluorine-containing polymer having an ion exchange group derived from a carboxyl group or a sulfo group. 
     
     
         6 . A method for producing the ion exchange membrane according to  claim 1 , comprising:
 spraying a coating solution comprising inorganic particles, a binder, and a solvent by a spray system, followed by drying thereof to form a coating layer on a surface of the membrane main body,   wherein the coating solution has a viscosity of 13 mPa·s or less.   
     
     
         7 . An electrolyzer comprising the ion exchange membrane according to  claim 1 .