Application of lignin in synthesis of polyurethane.

The research and application of lignin which is one of renewable natural resources become more and more active.The introduction of lignin into materials may not only enhances its properties,but also can lower the costs.In this review,the explo-ratory development and application progress of using lignin or modified lignin to replace parts of polyols in the field of polyurethane synthesis are presented such as polyurethane in foam,film,adhesive and paints.Research on lignin-modified polyurethane will become the focus in connection with its structure and properties.