Durable and multifunctional antifog, antifrost, and self-cleaning/oil repellant UV curable polyurethane coating based on poly(sorbitol-co-isophorone-co-ethyleneglycol)acrylate
A recent research proves that the integration of sorbitol and polyethylene glycol in UV-curable polyurethane coatings results in multifunctional properties that provide a sustainable solution for various applications. Characterization of the resins and hydrophilicity studies and testing have underlined the performance of these coatings and demonstrated their effectiveness in preventing fogging, frost formation and oil fouling.
Sorbitol is a naturally occurring sugar alcohol and this work focuses on sorbitol-based UV curable polyurethane coatings for antifog, antifrost, and self-cleaning applications. The resins were synthesized by reacting isophorone diisocyanate (IPDI) with varying proportions of sorbitol and polyethylene glycol (PEG200). The resins synthesized were characterized 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 photoinitiator.
The coatings were applied on silane-treated glass substrates and then cured under UV light. The hydrophilicity of coatings was investigated by water contact angle measurement. The antifog, antifrost, and self-cleaning tests were carried out and it was observed that the coating shows antifog property for a contact angle below 33° but antifrost effect was shown by the coatings with a contact angle less than 7°. Owing to the excellent hydrophilicity, the black stains of oil were washed out with ease under a water flow, hence showing excellent oil repellent/self-cleaning property as well.
The research has been published in Journal of Coatings Technology and Research, Volume 21, Issue 1 , 03 January 2024.
Reading tip: Polyurethane
The chemistry of polyurethane coatings is of great significance in many applications worldwide. Moreover, their development potential has yet to be exhausted by any means. New applications are being identified and the product range will be further development.
The book “Polyurethanes Coatings, Adhesives and Sealants ” rovides a comprehensive overview of the chemistry and the various possible application fields of polyurethanes. It starts by illustrating the principles of polyurethane chemistry, enabling the reader to understand the current significance of many applications and special developments. Newcomers learn about the key concepts of polyurethane chemistry and the main application technologies, while experienced specialists will value the insights on current trends and changes.
