Polyurethane, also known as polyurethane, is a general term for macromolecular compounds containing repeating amino ester groups on the main chain. It is formed by the addition of organic diisocyanates or polyisocyanates with dihydroxy or polyhydroxy compounds. In addition to carbamate, polyurethane macromolecules can also contain functional groups such as ether, ester, urea, biuret, and...