NDI(1,5-naphthalene diisocyanate) is a kind of polyurethane (PU) synthesized by diisocyanate. Compared with MDI and TDI, NDI with higher melting point, high molecular rigidity, regularity, and symmetry, which can fundamentally improve the degree of phase separation of polyurethane, making NDI-based polyurethane obtain more excellent mechanical and physical properties. NDI-based polyurethane has high wear resistance, high heat resistance, corrosion resistance and excellent dynamic properties, and is mainly used in high dynamic load and heat resistance occasions.