In this work, bio-based air-drying water-borne polyurea dispersions (Bio-PUDs) containing alkyd intermediate as polyol and aniline trimer (AT) as chain extender were synthesized, characterized, and applied as an anticorrosion coating. Firstly, the structure and physical characteristics of bio-based air-drying water-borne polyurea dispersions with aniline trimer as a chain extender were studied using Fourier transform infrared spectroscopy, thermogravimetric analysis, differential scanning calorimetry, and rheological testing. The coating properties and anticorrosive performance of bio-based air-drying water-borne polyurea coatings were also investigated. The results indicated that the bio-based water-borne polyurea containing aniline trimer as a chain extender was synthesized successfully. Meanwhile, 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. 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.

在这项工作中，合成、表征了生物基风干水性聚脲分散体 (Bio-PUDs)，其中醇酸中间体作为多元醇和苯胺三聚体 (AT) 作为扩链剂，并将其用作防腐涂料。首先，采用傅里叶变换红外光谱、热重分析、差示扫描量热法和流变测试研究了以苯胺三聚体为扩链剂的生物基风干水性聚脲分散体的结构和物理特性。还研究了生物基风干水性聚脲涂料的涂层性能和防腐性能。结果表明，成功合成了以苯胺三聚体为扩链剂的生物基水性聚脲。同时，随着醇酸中间体和苯胺三聚体的加入，生物基风干型聚脲水分散体的玻璃化转变温度和拉伸强度增加。此外，涂层性能表明，添加醇酸中间体和苯胺三聚体后，风干型聚脲涂层的不粘时间更短，涂层硬度更高。此外，与 Bio-PUDs-0（不含醇酸中间体和 AT）、Bio-PUDs-1（不含 AT 的扩链剂）和 Bio-PUDs-3（含 10% AT 的扩链剂）相比，Bio-PUDs-2 (含 5 % AT 的扩链剂）表现出低粘度、平衡的涂层性能和出色的防腐性能。因此，醇酸中间体和苯胺三聚体可用于提高生物基风干水性聚脲涂料的涂层性能和耐腐蚀性能。