Diaphragm for alkaline water electrolysis and method for producing the same

• Main Authors: MANABE AKIYOSHI, HASHIMOTO TERUMI, ITO TAKAFUMI, SHIMOMURA IKUO, KAMEI YUJI, KATO AKIHIRO
• Format: Patent
• Language: Chinese; English
• Published: 01.01.2021
• Subjects: APPARATUS THEREFOR; CHEMISTRY; ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTIONOF COMPOUNDS OR NON-METALS; METALLURGY

A diaphragm is provided with a porous support and a polymer porous membrane impregnated into the support from one surface of the support. When one surface of the porous membrane is defined as A, a surface opposite to the surface A is defined as B, a cross-section of the porous membrane parallel to the surface A and the surface B is defined as a cross-section C, an average pore diameter in the surface A is defined as DA, an average pore diameter in the surface B is defined as DB, and an average pore diameter in the cross-section C is defined as DC, and the average pore diameter DA and DB are substantially the same. The average pore diameter DC is larger than the average pore diameter DA and the average pore diameter DB. When a cross-section or a surface parallel to the surface A and the surface B in an impregnation region of the porous membrane is defined as a surface S, and an average pore diameter in the surface S is defined as DS, the average pore diameter DS is equal to or greater than the average pore dia