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Polyaspartic ester polyurea-TiO₂ composite coatings for UV protection of wind turbine blades
A new study demonstrates that TiO₂ nanoparticles in polyaspartic ester polyurea matrices can provide UV protection. The findings open cost-effective opportunities to enhance the durability of wind turbine blades.
Polyaspartic ester polyurea (PAEPU) is renowned for its durability but suffers from limited UV-A resistance. Recent research utilises commercially available TiO₂ nanoparticles to enhance UV stability, unlocking potential applications for the leading edges of wind turbine blades.
The study reveals that TiO₂ nanoparticles can be evenly dispersed into PAE matrices without modification. The optical properties of spin-coated PAEPU/TiO₂ composite films demonstrated significant UV blocking at TiO₂ concentrations below 0.3 wt%. At concentrations above 0.5 wt%, a transition from transparency to translucency occurs due to multiple scattering effects.
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Optimal TiO₂ concentration for UV protection
Coatings with 0.1 wt% TiO₂ exhibited the lowest ΔE values during accelerated weathering tests compared to higher TiO₂ concentrations or neat PAEPU films. The findings suggest that low TiO₂ loading in PAE matrices, without complex surface modification, suffices to improve UV protection.
This cost-efficient approach could provide a sustainable solution to extend the lifespan of wind turbine blades while meeting weather resistance requirements.
Source: Ölçer, Y.A. et al., Polyaspartic ester polyurea-TiO₂ nanocomposite coatings for UV protection of leading edge of wind turbine blades. Progress in Organic Coatings, 109887 (2025).
