| abstract |
The invention relates to a lignin-modified water-based polyurethane film and a preparation method thereof, belonging to the technical field of preparation of water-based polyurethane materials. The aqueous polyurethane film includes oligomer polyol, polyisocyanate, hydrophilic chain extender, oxime-based compound, polyamine compound, acid compound, organic solvent and lignin. In the invention, the lignin is introduced into the synthesized polyurethane emulsion by in-situ addition of the water phase, so that the in-situ nano-dispersion effect of the lignin in the water-based polyurethane system is realized, and the water-based polyurethane film is obtained by heating and curing, which greatly improves the mechanical properties. , and effectively retains the self-healing function, improving the recycling performance of the material. |