▎ 摘　　要

NOVELTY - Preparation of degradation immune biomimetic protective coating for steel structure engineering involves (1) (1a) cleaning the surface of the steel structure, maintaining the surface of the steel structure to a certain degree of roughness, obtaining steel structure component (I) after preliminary treatment, (1b) preparing silane coupling agent solution, brushing it evenly on the surface of steel structural member (I), curing, obtaining processed steel structure component (II), (1c) immediately painting the primer on the surface of the steel structure component (II) to make it into a film, curing, obtaining specific targeted controlled-release corrosion-inhibiting immune layer, (2) spraying the intermediate paint, obtaining a non-specific self-repairing stress immune layer, and immediately spraying the top coat. USE - Preparation of degradation immune biomimetic protective coating for steel structure engineering (claimed). ADVANTAGE - The method produces degraded immune biomimetic protective coating, which simulates the three-line defense structure of the human immune system, and protects the steel structure from two aspects of physical crack repair and chemical corrosion resistance, and realizes immunity to the deterioration of the steel structure. DETAILED DESCRIPTION - Preparation of degradation immune biomimetic protective coating for steel structure engineering involves (1) (1a) cleaning surface of steel structure, maintaining the surface of the steel structure to a certain degree of roughness, obtaining steel structure component (I), (1b) preparing 0.5-1.0% silane coupling agent solution, brushing on the surface of steel structural member (I), curing at room temperature for 3-12 hours, obtaining processed steel structure component (II), (1c) painting primer on surface of the steel structure component (II), curing at 55-60 degrees C for 0.5-2 hours, obtaining controlled-release corrosion-inhibiting immune layer, (2) spraying intermediate paint after heating to 80-100 degrees C, obtaining non-specific self-repairing stress immune layer, (3) maintaining the surface temperature at 30 degrees C or high, and spraying top coat. The coating matrix of the topcoat is pure polyurethane, semi-polyurethane and semi-polyurea or pure polyurea, When the coating substrate is mainly polyurethane, the polyether used is polyether polyol. When the coating base is polyurea as the main component, the polyether used is polyetheramine. The primer is corrosion inhibitor-polyurethane blend system, and has thickness of 80-150 mu m. The corrosion inhibitor is polyaspartic acid and polyphosphate, molybdate, organic phosphorus corrosion inhibitor, aluminum powder and/or zinc powder. The intermediate paint is a self-healing polyurethane-polyurea solution and has thickness of 100-400 mu m. The film thickness of the topcoat is 150-500 mu m. The topcoat is a two-dimensional material composite polyurethane/polyurea solution. The self-healing polyurethane-polyurea solution is prepared by (2a) preparing graphene oxide modified polyurea-based double-walled microcapsules, (2b) preparing polydopamine microspheres, (2c) adding polyetheramine to solvent, adding in drops to isocyanate, polymerizing at 2-30 degrees C for 0.5-1 hour, adding polydopamine microspheres and amino chain extender to solvent, adding to aforementioned prepolymer, controlling the molar ratio of isocyanate to amine in the reaction system at 1.05:1-1.2:1, adding graphene oxide modified polyurea-based double-walled microcapsules, and high-speed stirring. The two-dimensional material composite polyurethane/polyurea solution is prepared by mixing polyether, solvent (s1) and emulsifier, vacuum dehydrating at 100-120 degrees C for 1-3 hours, cooling to 20-65 degrees C, slowly adding isocyanate monomer, prepolymerizing for 5-60 minutes, adding 0.5-15 wt.% two-dimensional material, 0.01-1 wt.% UV light stabilizer, 0.05-5 wt.% heat stabilizer, polyester polyol and amino chain extender into solvent (s2), mixing, adding to aforementioned prepolymer and heat-preserving for 0.5-3 hours. INDEPENDENT CLAIMS are included for the following: (1) degradation immune biomimetic protective coating prepared by the method. The degraded immune biomimetic protective coating is a protective coating on a steel structure substrate, and comprises primer, intermediate paint and top paint from the inside to the outside.