▎ 摘　　要

NOVELTY - Preparing high strength adhesive hydrogel with double-layer structure comprises (i) adding oxidized graphene powder and tannic acid into distilled water and ultrasonically dispersing to obtain oxidized graphene; (ii) adding aqueous-soluble monomer and chemical cross-linking agent into the oxidized graphene tannic acid precursor, stirring, adding redox initiator, stirring, reacting for 3-7 hours at room temperature to obtain hydrogel, immersing the hydrogel in the metal ion solution, immersing for 1-3 hours to obtain high-strength hydrogel with uniform structure; and (iii) soaking part of the surface of the hydrogel in the ethylene diamine tetraacetic acid solution, soaking thickness is ≤ 10-30% of the thickness of the hydrogel, and soaking for 10-60 hours. USE - Preparation method of high strength adhesive hydrogel with double-layer structure used as three-dimensional network structure polymer material for biological medical treatment and electronic sensing. ADVANTAGE - The method provides high-strength adhesive hydrogel with double-layer structure, with excellent mechanical performance and adhesive performance. DESCRIPTION OF DRAWING(S) - The drawing shows a conductive diagram of the hydrogel prepared in Example 1. 2Then respectively adding water-soluble monomer total molar weight 4Then respectively adding water-soluble monomer total molar weight 40Oxidized graphene