General situation of the development and current situation of polyurethane

the development of polyurethane has gone through more than 70 years , if we count from the synthesis of isocyanate, we have to push it forward almost a century. as early as 1849, german chemist wurz prepared aliphatic isocyanates. in 1850, german chemist hoffmann synthesized phenyl isocyanate. however, it was not until 1937 that dr.…