▎ 摘　　要

NOVELTY - Preparation of degraded immune biomimetic protective coating involves pretreating the surface of concrete to make the surface of concrete clean, smooth and reach desired surface roughness, impregnating the concrete surface with a silane emulsion at 5-40 degrees C such that depth of concrete impregnation is 1-4 mm, heating to 25-60 degrees C, spraying with primer to obtain a non-specific self-healing stress-immune layer having thickness of 250-1000 mu m, maintaining the surface temperature at 30 degrees C or more, and immediately spraying the top coat to obtain the non-specific degraded self-differentiation immune layer having thickness of 100-2000 mu m. USE - Preparation of degraded immune biomimetic protective coating for water conservancy projects. ADVANTAGE - The degraded immune biomimetic protective coating having excellent chemical resistance and crack resistance can be formed economically. DETAILED DESCRIPTION - Preparation of degraded immune biomimetic protective coating involves pretreating the surface of concrete to make the surface of concrete clean, smooth and reach desired surface roughness, impregnating the concrete surface with a silane emulsion at 5-40 degrees C such that depth of concrete impregnation is 1-4 mm, heating to 25-60 degrees C, spraying with primer to obtain a non-specific self-healing stress-immune layer having thickness of 250-1000 mu m, maintaining the surface temperature at 30 degrees C or more, and immediately spraying the top coat to obtain the non-specific degraded self-differentiation immune layer having thickness of 100-2000 mu m. The primer is epoxy resin obtained by preparing graphene oxide-modified polyurea-based double-walled microcapsules, preparing polydopamine microspheres, adding 0.5-10 wt.% prepared microcapsules and microspheres and epoxy resin curing agent (a) to powdered epoxy resin, dispersing to obtain self-healing epoxy powder, or adding 0.5-10 wt.% prepared microcapsules and microspheres to an epoxy resin solution, and dispersing at high speed, adding an epoxy resin curing agent (b), and stirring to obtain a self-healing epoxy solution. The topcoat is a two-dimensional composite polyurethane/polyurea solution obtained by mixing polyether, solvent (S1) and emulsifier, performing vacuum dehydration at 100-120 degrees C for 1-3 hours, cooling to 20-65 degrees C, adding isocyanate monomer, prepolymerizing for 5-60 minutes to obtain prepolymer, adding a two-dimensional material, ultraviolet light stabilizer, thermal stabilizer, polyester polyol and amino chain extender into solvent (S2), mixing, adding mixture to prepolymer, and reacting for 0.5-3 hours to obtain a two-dimensional material composite polyurethane/polyurea solution. The coating matrix of the topcoat is pure polyurethane, semi-polyurethane and semi-polyurea or pure polyurea. An INDEPENDENT CLAIM is included for degraded immune biomimetic protective coating.