introduction as a highly efficient and environmentally friendly catalytic material, polyurethane catalyst 9727 is increasingly used in the field of electronic packaging. as electronic products develop ...

introduction polyurethane (pu) is a polymer material produced by the reaction of isocyanate and polyol. due to its excellent physical properties and chemical stability, it has been widely used in many ...

introduction polyurethane (pu) is a widely used polymer material. due to its excellent physical properties and chemical stability, it has been widely used in many fields such as construction, automobi ...

introduction on a global scale, sustainable development has become the focus of common concern for enterprises and society. as environmental problems become increasingly serious, governments and inter ...