Aiming at the problem of poor damping performance of di-phenylmethane diisocyanate (TDI) polyurethane (PU) elastomer prepared by chain extension of pure 3,3'-dichloro-4,4'-diaminodiphenylmethane (MOCA), MOCA/polytetrahydrofuran ether glycol (PTMG) mixed chain extender was used to prepare PTMG-TDI PU elastomer with different chain extender ratios by prepolymer method. FTIR, DSC, and DMA tests showed that with the increase of PTMG1000 (Mn=1 000) in the mixed chain extender, the hydrogen bonding index of PU reduced, and the microphase separation degree of soft and hard segments decreased leading to the melting temperature and melting enthalpy of hard segment microcrystalline decreased, and the loss factor tan δ increased. When the MOCA/PTMG1000 (molar ratio) is 85 15，the PU hardness, tensile strength，and tear strength are 85 A，33.1 MPa, and 70.5 kN/m, respectively. Compared with the PU prepared by pure MOCA，the hardness is reduced by 5 A, the mechanical strength is maintained at a higher value and the tan δ is increased. Finally, the prepared metal hub/PU roller meets the durability test standard, and the operating noise is reduced by 3 dB.