Preparation of environment-friendly chelator-modified sodium-based montmorillonite/two-component polyurethane strippable materials and their performance of radionuclide removal

To address the limitations of conventional strippable materials (prolonged curing, poor substrate adaptability), this study developed a novel decontamination composite by incorporating tetrasodium iminodisuccinate (IDS) modified sodium montmorillonite (Na-Mt) into two-component polyurethane (2KPU). The modified Na-Mt exhibited expanded interlayer spacing (1.26 → 1.51 nm) and enhanced adsorption capacities for Cs(I), Sr(II), and Cd(II) by 58.5, 66.8, and 45.2 mg/g, respectively. Optimized composites achieved 21.6% higher peel strength, 12°C increased thermal stability, and > 95% decontamination rates across substrates (99.6% for Cs). Notably, rough-surface decontamination efficiency surpassed pure 2KPU by 6%. This fast-curing (≤ 30 min), high-performance material demonstrates significant potential for radionuclide removal in nuclear facility applications.