Water-Repellent Fluoropolymer-Based Coatings
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Release coatingsWater repellencyFluoropolymerPolytetrafluoroethyleneLaser ablation
Paz-Gómez, G.; del Caño-Ochoa, J.C.; Rodríguez-Alabanda, O.; Romero, P.E.; Cabrerizo-Vílchez, M.; Guerrero-Vaca, G.; Rodríguez-Valverde, M.A. Water-Repellent Fluoropolymer-Based Coatings. Coatings 2019, 9, 293. [doi:10.3390/coatings9050293]
SponsorshipThe research was funded by the projects MAT2014-60615-R and MAT2017-82182-R, funded by the Spanish Ministry of Economy and Competitiveness (MINECO-FEDER).
Fluoropolymer-based coatings are widely used for release applications. However, these hydrophobic surfaces do not reveal a significantly low adhesion. Water repellency incorporated to fluoropolymer coatings might enhance their release performance. In this work, we focused on the surface texturing of a well-known polytetrafluoroethylene (PTFE)-based coating. We explored as texturing routes: sanding, sandblasting and laser ablation. We examined the surface roughness with white light confocal microscopy and the surface morphology with environmental scanning electron microscopy (ESEM). Water-repellent fluoropolymer coatings were reproduced in all cases, although with different degree, parametrized with bounces of water drops (4–5 μL). Laser ablation enabled the lowest adhesion of coatings with 24 ± 2 bounces. This result and the current development of laser patterning for industry assure the incipient use of laser ablation for release coatings.