Sorbitol-based UV polyurethane coatings for multiple applications
Researchers tested anti-fog, anti-frost, and self-cleaning properties of the coatings.
Sorbitol is a naturally occurring sugar alcohol. A new study focuses on sorbitol-based UV curable polyurethane coatings for anti-fog, anti-frost, and self-cleaning applications.
The resins were synthesised by reacting isophorone diisocyanate (IPDI) with varying proportions of sorbitol and polyethylene glycol (PEG200). The resins synthesised were characterised by FTIR, 1H NMR, and analytical techniques such as hydroxyl, iodine, and acid values. Various formulations were prepared using the developed resin, reactive diluents, and photoinitiators. The coatings were applied on silane-treated glass substrates and then cured under UV light. The hydrophilicity of the coatings was investigated by water contact angle measurement.
Anti-fog, anti-frost, and self-cleaning tests were carried out and it was observed that the coatings exhibited anti-fog properties at a contact angle below 33°, and the anti-frost effect of the coatings with a contact angle less than 7°. Due to the excellent hydrophilicity, the black oil stains were washed out with ease under a water flow, thus also showing excellent oil repellent/self-cleaning properties.
Source of the study: Journal of Coatings Technology and Research, January 2024.
