Abstract
Renewable resource-based hybrid crosslinker was successfully synthesized via sol-gel technology. The synthesis involved malenization of Cashew Nut Shell Liquid (CNSL) followed by its silane modification and subsequent hydrolysis and condensation with tetraethyl orthosilicate (TEOS). The synthesized crosslinker was characterized by spectroscopic analysis (FT-IR, 1 H-NMR, 13 C-NMR and 29 Si-NMR) for structural elucidation. The crosslinker was further formulated in a conventional stoving system. Fully-cured coatings were obtained after stoving at 120°C for ½ hr and were then evaluated for physical, mechanical, chemical, optical, accelerated weathering, electrochemical and morphological properties. The incorporation of hybrid crosslinker in a conventional stoving system was observed to improve overall coating properties. The excellent properties can be attributed to the combination of an aliphatic chain of CNSL and siloxane (-Si-O-Si-) moieties within the coating, resulting in good balance of flexible and dense structure which would take care of load distribution properties and penetration of corrosive chemicals through coatings.
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