Research of hydrophobic, UV resistance properties of FEVE/CNTs nanocomposite coating on the basis of fluoroethylene vinyl ether (FEVE) resins
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https://doi.org/10.54939/1859-1043.j.mst.VITTEP.2022.185-191Keywords:
Nanocomposite coating; UV resistance; Hydrophobicity; Fluoropolymer; Carbon nanotubes.Abstract
Most protective coatings for metals and alloys are quickly degraded and lose their functionalities with less than 5 years of durability in the tropical climate. The current conventional coatings are unstable under influence of ultraviolet radiation and alternating surface wetness. This research is aiming to develop a FEVE/CNTs nanocomposite coating on the basis of combined fluoroethylene vinyl ester (FEVE) resin with carbon nanotubes (CNTs) and polyisocyanate hardener, which are anticipated durable due to the C-F bonding energy in the FEVE molecule and the nanosize effect of CNTs particles. The FEVE/CNTs nanocomposite consisting of FEVE, CNTs, and UV resistant additive main components, was fabricated by grinding and ultrasonic dispersion. Physico-mechanical, chemical properties and durability of the coating were examined. As a result, the gloss retention of the coating was retained at over 90% after 720 hours of UV irradiation and humidification testing. Meanwhile, the comparative gloss retention values of polyurethane, epoxy, acrylic, and alkyd coatings were estimated at 74%, 67%, 66%, and 62%, respectively. The coating is formed with high hydrophobicity, demonstrating the contact angle of 105°.
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