▎ 摘　　要

NOVELTY - A method for preparing low-conductivity graphene/polyurethane composite coating, involves stripping expanded graphite into graphene dienophile through dry high-energy ball milling, bonding maleimide dienophile to the edge and the basal plane of graphene through Diels-Alder reaction, to form maleimide modified graphene. The maleimide modified graphene is then mixed with a polyurethane coating to form the low-conductivity graphene/polyurethane composite coating. USE - The low-conductivity graphene/polyurethane composite coating prepared by Diels-Alder reaction, is used in solvent coating applications. ADVANTAGE - The low-conductivity graphene/polyurethane composite coating prepared, has improved corrosion prevention property. The maleimide grown on the surface of graphene increases dispersibility of graphene in polyurethane coating, and hence the mechanical property of the coating is improved. The bonding of maleimide on basal plane of graphene through the Diels-Alder reaction, enables to change the original energy band structure of graphene, thereby extending the period of corrosion prevention activity in the coating. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for low conductivity graphene/polyurethane composite coating. DESCRIPTION OF DRAWING(S) - The drawing shows an SEM image of expandable graphite.