Bio-based anti-corrosive and anti-bacterial coating

A present work highlights ambient-cured cardanol-derived polyurea coatings for anti-corrosive and anti-bacterial applications.

Cardanol, a well-known bio-based precursor is mainly extracted from nuts of cashew fruits and discarded as waste products from cashew industries. Image source: LoggaWiggler - Pixabay (symbol image).

A new study highlights the potential of a bio-based precursor i.e., cardanol for synthesising solventless coating systems for corrosion inhibition. Initially, prepolymer resin was synthesized from cardanol and was later reacted with toluene diisocyanate (TDI) in different wt% (10, 15, 20, and 25) to obtain an ambient cured polyurea (ACPUrea) resin. Test results reveal that ACPUrea3 coatings performed better than their other counterparts and 20 wt% TDI is the optimal amount required to fabricate mechanically durable, thermally resistant (>250 °C), hydrophobic, and chemically stable coatings. X-ray diffraction and field emission scanning electron microscopy techniques confirmed the amorphous nature and rough morphology of ACPUrea coating.

Excellent corrosion resistance

The bactericidal activities of ACPUrea coatings were also evaluated by standard methods against various gram-positive and gram-negative bacteria, no bacterial growth was observed on and underneath these coatings. Electrochemical impedance spectroscopy suggested outstanding corrosion inhibition efficacy (82 %) of ACPUrea3 coating in harsh corrosive environments. Furthermore, the impedance value observed from the Nyquist plot was found to be steady throughout 15 days of immersion. The overall study emphasises the utilisation of cardanol for synthesising polyurea coatings with higher thermal stability, excellent corrosion resistance, and strong bactericidal properties.

The study has been published in Progress in Organic Coatings, Volume 182, September 2023.

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