▎ 摘　　要

NOVELTY - Graphene oxide-based water retaining agent preparation involves adding aniline monomer to hydrochloric acid solution, configuring into aniline monomer solution after ultrasonic treatment for 10-15 minutes, transferring to an ice bath for 20-30 minutes, and then slowly adding dropwise to dissolve in the hydrochloric acid solution under rapid stirring. The ammonium persulfate solution is added under stirring for 6-8 hours under ice bath conditions, filtered after completion of the reaction, washed alternately with absolute ethanol and distilled water for 5-7 times, and then freeze-dried for 10-15 hours to obtain polyaniline nanowires. The graphene oxide gel is dispersed in distilled water to obtain a graphene oxide gel suspension, and then mixed with polyaniline nanowires to the suspension in a mass ratio of 1:1-3 to obtain three-dimensional composite gel. USE - Method for preparing graphene oxide-based water retaining agent for dry powder mortar. ADVANTAGE - The method prepares the graphene oxide-based water retaining agent in a simple, cost-effective and eco-friendly manner with increased water content, and effectively blocks loss of water and achieves effect of water retention. DETAILED DESCRIPTION - Graphene oxide-based water retaining agent preparation involves adding aniline monomer to hydrochloric acid solution, configuring into aniline monomer solution after ultrasonic treatment for 10-15 minutes, transferring to an ice bath for 20-30 minutes, and then slowly adding dropwise to dissolve in the hydrochloric acid solution under rapid stirring. The ammonium persulfate solution is added under stirring for 6-8 hours under ice bath conditions, filtered after completion of the reaction, washed alternately with absolute ethanol and distilled water for 5-7 times, and then freeze-dried for 10-15 hours to obtain polyaniline nanowires. The graphene oxide gel is dispersed in distilled water to obtain a graphene oxide gel suspension, and then mixed with polyaniline nanowires to the suspension in a mass ratio of 1:1-3 to obtain three-dimensional composite gel. The obtained three-dimensional composite gel is freeze-dried for 10-15 hours, crushed and ground to pass 100 mesh sieve to obtain three-dimensional composite particles. The appropriate amount of zinc nitrate hexahydrate, 2-methylimidazole and 2-aminobenzimidazole is dissolved in methanol solution under stirring at room temperature for 1-2 hours to obtain the amino-functionalized ZIF-8. The proper amount of 1,2-bis(triethoxysilyl)ethane (BTEST) is dissolved in absolute ethanol and hydrochloric acid aqueous solution under stirring at 40-45 degrees C for 2-3 h to obtain BTESE sol. The appropriate amount of amino-functionalized ZIF-8 and the BTESE sol undergo ultrasonic treatment for 30-40 minutes to obtain a composite sol solution. The three-dimensional composite particles are added into the composite sol solution for 1-2 minutes at 120-140 degrees C in an air atmosphere to obtain the desired graphene oxide-based water retaining agent for dry powder mortar.