Preparation and Performance Study of Bio-based Self-healing Waterborne Polyurethanes Containing Imine Bonds

WANG Yongtao; LU Jiehong; CHEN Ren; GUO Yunfeng; YUAN Teng

doi:10.19554/j.cnki.1001-3563.2026.09.017

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Packaging Engineering ›› 2026, Vol. 47 ›› Issue (9) : 159-169. DOI: 10.19554/j.cnki.1001-3563.2026.09.017

Advanced Materials

Preparation and Performance Study of Bio-based Self-healing Waterborne Polyurethanes Containing Imine Bonds

WANG Yongtao¹, LU Jiehong², CHEN Ren², GUO Yunfeng^1,*, YUAN Teng^1,*

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Abstract

The work aims to introduce dynamic imine bonds into the backbone of bio-based waterborne polyurethane (WPU) to explore bio-based WPU coating materials that combine excellent self-healing properties with high mechanical strength, thereby clarifying their practical application potential. With castor oil (CO) and sorbitol monooleate (SP) as bio-based polyol blends, a series of waterborne polyurethane dispersions were successfully synthesized via the prepolymer dispersion method by adjusting the feed ratio of the chain-extender HBA-AP, which contained dynamic imine bonds, and 1,4-butanediol (BDO). As the HBA-AP additions gradually increased, both the mechanical properties and thermal stability of the WPU films improved significantly. Specifically, the tensile strength of the WPU-20% HBA-AP films reached a maximum of 19.71 MPa, while the characteristic temperature T_10% and T_50% of the thermal gravimetric analysis increased by 11.6 ℃ and 9.2 ℃, respectively, compared with the WPU-0% HBA-AP film. After 12 hours of recovery at 80 ℃, the maximum healing efficiency of tensile strength and elongation at break for the WPU-20% HBA-AP film reached 83.97% and 81.05%, respectively, demonstrating excellent self-healing efficiency. Based on the reversible exchange reaction mechanism of dynamic imine bonds, bio-based WPU materials that combine high mechanical properties, excellent thermal stability, and good self-healing capability are successfully prepared. This work not only provides an effective technical strategy for addressing the practical issue of reduced service life in traditional coatings caused by surface microcracks, but also offers reliable experimental data and theoretical references for the molecular structural design of high-performance, environmentally friendly coating materials.

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bio-based waterborne polyurethane / imine bonds / castor oil / sorbitan monooleate / self-healing

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WANG Yongtao, LU Jiehong, CHEN Ren, GUO Yunfeng, YUAN Teng. Preparation and Performance Study of Bio-based Self-healing Waterborne Polyurethanes Containing Imine Bonds[J]. Packaging Engineering. 2026, 47(9): 159-169 https://doi.org/10.19554/j.cnki.1001-3563.2026.09.017

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