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Optimised FPU/WPU coating combines superhydrophobicity with mechanical durability
Researchers have developed a superhydrophobic coating by integrating fluorinated polyurethane (FPU) with water-based polyurethane (WPU), achieving excellent abrasion stability and enhanced corrosion protection.
Fluorinated polyurethane (FPU) coatings are well known for their water-repellent properties but suffer from poor mechanical durability, losing hydrophobicity under friction or wear. A team led by Jihua Bao addressed this limitation by integrating waterborne polyurethane (WPU) and designing a controlled crosslinking structure.
The study shows that WPU significantly improves wear resistance, while FPU is crucial for corrosion protection. An optimal formulation with 10 % WPU maintained superhydrophobicity and self-cleaning performance even after abrasion and protected metal substrates in 3.5 % NaCl solution for seven days. Higher WPU levels reduce fluorine group density and weaken corrosion resistance, while too little WPU compromises mechanical strength.
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Balanced formulation for long-term protection
By fine-tuning the FPU/WPU ratio, coatings can combine high durability with long-lasting water repellency, offering an effective solution for the corrosion protection of metals exposed to wear.
Source: Bao, J. et al. Mechanisms of friction and corrosion resistance in superhydrophobic waterborne polyurethane modified fluorinated polyurethane coatings. Prog. Org. Coat. 207, 109434 (2025).
