Abstract
Coatings derived from organofunctional silanes have been investigated as possible replacements for the chromate-based systems used in the aerospace industry. In this study, organofunctional silanes [bis-(triethoxysilylpropyl)ethane and bis(triethoxysilylpropyl) tetrasulfide] were reacted with commercially available acrylate (ECO-CRYL™ 9790) and epoxy (EPI-REZ™ WD-510) resins, resulting in a one-step, low-VOC, chromate-free primer. Liquid-state 29Si and 13C NMR were used to determine structural characteristics of various optimized formulations. Once the components of a multi-component primer are mixed to formulate a solution the chemical reactions start between the various components. The primer solution is required to provide enough time before significant changes have occurred so as to facilitate a comfortable window for application on the substrates desired. The liquid-state NMR studies were conducted to investigate the pot-life chemistry of the primer solution after the components have been mixed. Described here are the possible chemical reactions occurring in the liquid primer solution. The reactions during curing of the coating have been investigated with SEM/EDX and FTIR and have been reported elsewhere.
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