In a recently coducted work, bio-based air-drying water-borne polyurea dispersions (Bio-PUDs) containing alkyd intermediate as polyol and aniline trimer (AT) as chain extender were synthesised, characterised, and applied as an anticorrosion coating.

The glass transition temperature and the tensile strength of bio-based air-drying aqueous polyurea dispersions increased with the addition of alkyd intermediate and aniline trimer. In addition, the coating performance showed that the air-drying polyurea coating had a shorter tack-free time and higher coating hardness with the addition of alkyd intermediate and aniline trimer.

Improved coating properties

Furthermore, compared with Bio-PUDs-0 (without alkyd intermediate and AT), Bio-PUDs-1 (chain extenders without AT), and Bio-PUDs-3 (chain extenders with 10 % AT), Bio-PUDs-2 (chain extenders with 5 % AT) displayed low viscosity, balanced coating properties and excellent anticorrosive performance. Therefore, alkyd intermediate and aniline trimer can be applied to improve the coating properties and corrosion resistance of bio-based air-drying aqueous polyurea coatings.

The study has been published in Progress in Organic Coatings, Volume 171, October 2022.