Preparation of lignin/TiO₂ nanocomposites and their application in aqueous polyurethane coatings

Abstract

A simple method using a water soluble lignin quaternary ammonium salt (LQAS) and TiO₂ has been developed for the preparation of lignin/TiO₂ nanocomposites in an aqueous medium under mild conditions. The LQAS/TiO₂ nanocomposites contain well-dispersed small particles with excellent ultraviolet (UV) shielding abilities and good compatibilities with waterborne polyurethane (WPU). When the LQAS/TiO₂ nanocomposites were blended with WPU, the UV absorbance and the tensile ductility of the WPU increased significantly. The composite WPU hybrid film containing 6 wt-% LQAS/TiO₂ nanocomposite had the highest visible light transmittance and had excellent ultraviolet aging properties. After 192 h of UV light irradiation, the tensile strength of the composite film was above 8 MPa and the elongation at break was 800%. This work highlights new possibilities for the utilization of alkali lignin.

Graphical abstract

Keywords

lignin / TiO₂ / nanocomposite particle / polyurethane film

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Acknowledgements

This work was supported by grants from the National Natural Science Foundation of China (No. 81430028), the Ministry of Science and Technology of China (No. 2011BAI15B02), the grants from the Science and Technology Commission of Shanghai Municipality (Nos.13DZ2280600 and 15DZ2290800), and the grant from Shanghai First People’s Hospital Affiliated to Shanghai Jiao Tong University (No. 81300776).

Compliance with ethics guidelines

Xiaofang Cui, Benting Ma, Yan Wang, Yan Chen, Chunling Shen, Ying Kuang, Jian Fei, Lungen Lu, and Zhugang Wang declare no conflicts of interests. All institutional and national guidelines for the care and use of laboratory animals were followed.

Electronic Supplementary MaterialƒSupplementary material is available in the online version of this article at https://doi.org/10.1007/s11684-017-0568-x and is accessible for authorized users.

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