Novel route to make greener alkyd coatings

A new study describes the valorisation of waste products from the food industry that can decrease the petro-based part in alkyd resins.

Cashews on a tree.
Cardanol is a phenolic lipid obtained from anacardic acid Image source: LoggaWiggler - Pixabay (symbol image).

Researchers have synthesised novel alkyd with mono- and di- functional cardanol monomers and demonstrated that those monomers could replace some of the monomers used in alkyd resins, which were petrosourced. Indeed, the renewable carbon content have been increased by up to 12 %.

Cardanol highly increased the thermal stability

The film properties (gloss, adhesion, drying time) have been investigated and the results showed that the introduction of cardanol monomers did not impact the coatings properties except for the colour. Furthermore, thermogravimetric analysis has demonstrated that cardanol highly increased the thermal stability of alkyd resins.

The study has been published in Progress in Organic Coatings, Volume 172, November 2022.

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