Curable hybrid materials for corrosion protection of steel: development and application of UV-cured 3-methacryloxypropyltrimethoxysilane-derived coating

• Published in: JCT research 2020-07, Vol.17 (4), p.977-989
• Main Authors: Scotland, Kevin M., Shetranjiwalla, Shegufa, Vreugdenhil, Andrew J.
• Format: Article
• Language: English
• Subjects: Catalysts; Chemistry and Materials Science; Coating; Condensates; Corrosion and Coatings; Corrosion prevention; Crosslinking; Graphical representations; Hydrolysis; Industrial Chemistry/Chemical Engineering; Low carbon steels; Materials Science; NMR; Nuclear magnetic resonance; Polymer Sciences; Reaction time; Room temperature; Sol-gel processes; Solvents; Substrates; Surfaces and Interfaces; Tetraethyl orthosilicate; Thin Films; Tribology; Ultraviolet radiation
• ISSN: 1547-0091; 1935-3804; 2168-8028
• DOI: 10.1007/s11998-019-00317-z

A UV-crosslinkable two-component organically modified silicate (ORMOSIL) sol–gel coating was made using 3-methacryloxypropyltrimethoxysilane (MaPTMS) and tetraethoxysilane (TEOS) in two stages. In the first stage, key synthetic parameters, such as use of co-solvents, reaction temperature, reaction time, and catalyst, were optimized for the rapid hydrolysis and condensation of the ORMOSIL. The ORMOSIL material was made using isopropanol as the solvent and HNO 3 as the acid catalyst. This resulted in a sol–gel that underwent rapid hydrolysis in 35 s. The ORMOSIL demonstrated extensive condensation after 10 min of stirring at room temperature followed by 10 min of heating at 60°C as monitored by 29 Si-NMR. In the second stage, the ORMOSIL was successfully crosslinked with up to 70% consumption of the acryl functionality within 5 min under UV light exposure in the presence of photoinitiator. The UV-crosslinked coating exhibited high adhesion to low-carbon steel and impeded substrate corrosion from 17 to 25 h under an accelerated corrosive environment. Graphic abstract Schematic representation of the hydrolysis and condensation of 3-methacryloxypropyltrimethoxysilane (MaPTMS) and tetraethoxysilane (TEOS) system and the 2D gHMBC 29 Si NMR of the system.