▎ 摘　　要

NOVELTY - Preparing high-strength water-retaining perfluorosulfonic acid proton exchange membrane, comprises e.g. (i) adding graphene oxide, lactic acid monomer, deionized water and stannous octoate into autoclave, pressurizing and heating, cooling, filtering, and washing to obtain lactic acid-functionalized graphene oxide, (ii) heating mixed aqueous solution of perfluorosulfonic acid resin with sulfonic acid at the end and polyvinyl alcohol, adding obtained lactic acid-functionalized graphene oxide, pressurizing, heating, heating and drying, (iii) adding obtained modified perfluorosulfonic acid resin into autoclave, adding isopropanol aqueous solution, heating, and cooling to obtain perfluorosulfonic acid resin solution, and (iv) adding obtained perfluorosulfonic acid resin solution into storage tank of casting machine, casting the film on transmission steel belt, entering transmission steel belt with film into oven, and ensuring residence time of film in oven. USE - The high-strength water-retaining perfluorosulfonic acid proton exchange membrane is useful in fuel cell (claimed). DETAILED DESCRIPTION - Preparing high-strength water-retaining perfluorosulfonic acid proton exchange membrane, comprises (i) adding graphene oxide, lactic acid monomer, deionized water and stannous octoate into autoclave in a mass ratio of 10:1-3:20:0.2, pressurizing and heating at temperature of 100-120 degrees C, pressure of 1-2 Mpa for 4-10 hours, naturally cooling to 40-60 degrees C, filtering, and washing with deionized water to obtain lactic acid-functionalized graphene oxide, (ii) heating the mixed aqueous solution of perfluorosulfonic acid resin with sulfonic acid at the end and polyvinyl alcohol at 95-100 degrees C, adding obtained lactic acid-functionalized graphene oxide based on the mass ratio of 5-20% of the aqueous solution, stirring uniformly, pressurizing at 1.5-2 Mpa in autoclave, heating at 105-120 degrees C, maintaining the temperature for 2-10 hours, heating and drying under normal pressure and stirring conditions to obtain modified perfluorosulfonic acid resin, (iii) adding modified perfluorosulfonic acid resin into autoclave, adding isopropanol aqueous solution, heating at 120-150 degrees C, stirring for 5 hours, nd cooling naturally to obtain perfluorosulfonic acid resin solution, and (iv) adding obtained perfluorosulfonic acid resin solution into storage tank of casting machine, keeping the storage tank at 80-90 degrees C, casting the film on transmission steel belt at 100-120 degrees C through casting knife edge, entering the transmission steel belt with film into oven to adjust the length of oven, and ensuring the residence time of film in oven for 0.5-1 hours based on the speed of transmission steel belt to obtain final product. An INDEPENDENT CLAIM is also included for high-strength water-retaining perfluorosulfonic acid proton exchange membrane prepared by above method.