The development of polyurethane
PolyurethaneOne of the main raw materials of resin is isocyanate, 蕞Alkyl isocyanate was prepared by the German chemist Wurtz in 1849 by metathesis reaction of alkyl sulfate and potassium cyanate. In 1850, Hofmann used diphenyloxamide to perform dehydrogenation reaction to obtain phenyl isocyanate. In 1884, Hentschel reacted amines or (ammonium) salts with phosgene to prepare…
