Method for preparing TPU conductive film

A method for preparing TPU conductive film is disclosed. TPU film is prepared from TPU by a thermo-compression formation technique, and properly swells in a xylene solvent; and the properly swollen TPU film is subjected to ultrasonic modification in xylene solutions containing carboxylated multi-walled carbon nanotubes with different mass concentrations to prepare the TPU conductive film with different conductivity. The carboxylated carbon nanotubes, adopted as a modifier, have active functional groups such as -COOH and -OH and can form intermolecular hydrogen bonds with a TPU polymer matrix,thus enhancing interaction with the TPU polymer matrix, and facilitating construction of a conductive network structure and improvement of mechanical properties. At a suitable temperature, the TPU film moderately swells in the solvent, so that the cMWCNTs not only uniformly modify the surface of the TPU film, but also penetrate into the film, which is favorable for the formation and stability of the conductive network, an