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Thursday, 19 September 2019
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Raw materials & technologies, Raw materials, Coatings binders

Improving cardanol derived epoxy coatings

Friday, 15 January 2016

Commercial epoxidised cardanol, from cashew nutshell liquid (CNSL), is a biobased reactant with interesting aromatic structure.

Cardanol is a phenolic lipid obtained from anacardic acid, the main component of cashew nutshell liquid (CNSL), a byproduct of cashew nut processing. Source: Holdi/pixelio.de
Cardanol is a phenolic lipid obtained from anacardic acid, the main component of cashew nutshell liquid (CNSL), a byproduct of cashew nut processin...

Cured with two different diamines, isophorone diamine and Jeffamine T403, the synthesised materials exhibit good properties but they do not meet properties of bisphenol A diglycidyl ether (BADGE) epoxy resins. Therefore epoxidised cardanol cannot replace directly BADGE for the synthesis of epoxy resins.

Different formulations could replace the use of BADGE

French researchers used three epoxy reactants, resorcinol, hBADGE and TMP, as reactive additives to enhance the properties of the cardanol derived materials. These epoxy networks with different ratios were characterised by thermogravimetric analysis, differential scanning calorimetry. Their hardness and gloss were measured as well as their resistance to chemical solvents.

The study is published in: Progress in Organic Coatings, Volume 91, February 2016, Pages 9–16.

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