Abstract: The present invention relates to a lithium cation exchange membrane, for water electrolysis, having high lithium cation conductivity, and a water electrolysis system using same, and a water electrolysis system using a lithium cation exchange membrane (LEM) for water electrolysis according to the present invention, comprising a hydrophilic polymer solution and a monomer solution having a sulfonic acid group, is an economically feasible water electrolysis system achieving lower costs than conventional proton exchange membrane (PEM) water electrolysis and a higher current density than alkali water electrolysis.

Abstract: The present invention relates to a lithium cation exchange membrane, for water electrolysis, having high lithium cation conductivity, and a water electrolysis system using same, and a water electrolysis system using a lithium cation exchange membrane (LEM) for water electrolysis according to the present invention, comprising a hydrophilic polymer solution and a monomer solution having a sulfonic acid group, is an economically feasible water electrolysis system achieving lower costs than conventional proton exchange membrane (PEM) water electrolysis and a higher current density than alkali water electrolysis.

Abstract: The invention discloses a multilayer coating system, which belongs to the technical field of coatings, the said multilayer coating system comprises an isocyanate curing coating and a Real Michael addition crosslinkable coating, wherein the isocyanate curing coating comprises at least one resin X containing an acidic carbon-hydrogen bond or an unsaturated carbon-carbon double bond with an electron-withdrawing group, and the resin X performs a Michael addition reaction with the Real Michael addition crosslinkable coating, so that the interlayer adhesion of the two coatings is greatly improved. According to the said multilayer coating system, the invention further discloses a coating method, a coating structure, and a coated substrate. The invention also provides an isocyanate curing coating, which is used for a primer coat for a Real Michael addition crosslinkable coating and a use thereof for improving the adhesion of the Real Michael addition crosslinkable coating to a substrate.