Bio-based air-drying water-borne polyurea coatings
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.