| abstract |
The invention discloses a lignin-based polyurethane chain extender and a preparation method and application thereof. The lignin-based polyurethane chain extender methylene diphenylamine is shown in formula I, and the preparation method is to split lignin into a monomer compound Hydroxyalkylation of II and carbonyl compound to obtain compound III, compound III and chloroacetamide through amination reaction to obtain compound IV, compound IV through Smiles rearrangement reaction to obtain lignin-based polyurethane chain extender methylene shown in formula I diphenylamine. The invention uses green and sustainable lignin as raw material, avoids the potential risk of carcinogenesis of 2-chloroaniline, a raw material required for producing MOCA, reduces the dependence on fossil resources, and the product of the invention acts as a chain extender to enhance the performance of polyurethane materials. Thermal stability, mechanical properties and aging resistance. |