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22. Jul 2019 | Application Areas

Multifunctional polyurethane coatings derived from undecylenic acid

Renewable resource based polyol derived from undecylenic acid, a by-product of castor oil, was successfully synthesised by three consecutive reactions: methylation, thiol-ene addition, and amidation.

Bottle of yellow liquid with seeds and a green leaf in front.

The undecylenic acid based polyol was used as a polyol along with phosphated cardanol-based polyol in the preparation of polyurethane coatings. Source: Picture Partners – stock.adobe.com.

The biobased polyol is a sulfur- and nitrogen-containing polyol. The structure was confirmed by FTIR, NMR, and mass spectroscopic techniques. The undecylenic acid based polyol was used as a polyol along with phosphated cardanol-based polyol in the preparation of polyurethane coatings. The obtained polyurethanes were assessed for their properties by various techniques such as thermogravimetric analysis (TGA), dynamic mechanical and thermal analysis (DMTA), Universal testing machine (UTM) and electrochemical study.

Drastically decreased corrosion rate

Interestingly, the biobased polyol improved mechanical property such as toughness of the material when it was incorporated in different weight percentages to the phosphated cardanol-based polyol. Moreover, the synergistic effect of the phosphorous and biobased polyol with the elements - sulfur and nitrogen, enhanced the anti-corrosion and antimicrobial natures of the polyurethane coating. The corrosion rate was drastically decreased from 3.0 × 10–4 to 1.8 × 10–7 mm per year for the prepared polyurethane coatings.

The study is published in: Progress in Organic Coatings Volume 134, September 2019, Pages 91-102.

Event tip: In October the European Coatings Technology Forum | Bio-based Coatings will gather international experts from the coatings sector to discuss and present the latest innovations and products that can help to reduce dependency on fossil raw materials.

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