20. May 2022 | Application Areas
Bio-based one-component epoxy resin
In a recently conducted work, an epoxy resin produced from an agroindustrial byproduct, cashew nutshell liquid (CNSL), was used for manufacturing a one-component anticorrosive epoxy coating. CNSL-based epoxy resin (e-CNSL) was synthesised using a solvent-free methodology with performic acid generated in situ.
The chemical structure of resin was evaluated and the curing parameters of the epoxy-phenol system with 1-methylimidazole (1-MIM) as an accelerator were investigated. The use of only 5% by weight of 1-MIM was efficient to catalyse the reaction, obtaining the lowest cure temperature (150 °C). The coating showed high crosslinking and good thermal-mechanical performance, where the initial decomposition temperature was 200 °C and glass transition temperature was 30 °C.
The anti-corrosive performance of e-CNSL/MIM5 exposed to salt spray and 3.5% w/v NaCl solution was studied. The coating presented high impedance module and high adhesive property, suffering low delamination during the tests. According to the study, the one-component bio-based coating developed is promising to be applied for corrosion protection purposes.
The study has been published in Progress in Organic Coatings, Volume 167, June 2022.
EC Tech Report Automotive Coatings
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