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Breakthrough in corrosion protection technology By introducing the benzimidazole heterocyclic structure, the material presents the following in 3.5% NaCl solution:   The chloride ion diffusion coefficient is as low as 0.7×10⁻¹²m²/s (GB/T 50082 standard) The bond strength attenuation rate of steel strands is less than 5%/year (5000 hours salt spray test)   Application evidence of the Hong Kong-Zhuhai-Macao Bridge In response to the dynamic sealing needs of expansion joints, the R&D team innovatively developed a "core-shell" structural slurry:   Core layer: polyether polyurethane provides ±15mm displacement compensation capability Outer shell layer: Silicon carbide nanoparticle reinforcement layer (particle size 50nm) improves wear resistance   Industrial verification data In the accelerated experiment simulating the tidal range, the oily slurry specimens experienced:   After 300 dry-wet cycles, the tensile strength retention rate was 91% After 2,000 hours of UV aging, the elongation still maintained the initial value of 82%