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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