▎ 摘　　要

NOVELTY - Preparation of functional graphene for modified negative electrode electrophoretic coating involves mixing graphene oxide dispersion with an amination reagent and pumping into microreactor for amination reaction to obtain aminated graphene, mixing aminated graphene and organic acid with ultrasound, filtering and washing for many times until the dispersion is weakly acidic to obtain functionalized graphene dispersion, homogenizing the functionalized graphene dispersion and negative electrode electrophoretic coating paste through a homogenizer, mixing the negative electrode electrophoretic coating emulsion and functionalized graphene-modified electrophoretic coating and deionized water to obtain functionalized graphene-modified negative electrode electrophoretic coating working solution, and using the working solution to carry out electrophoretic coating film, baking and curing at high temperature. USE - Preparation of functional graphene for modified negative electrode electrophoretic coating. ADVANTAGE - The method is efficient and safe to carry out functional modification on graphene. DETAILED DESCRIPTION - Preparation of functional graphene for modified negative electrode electrophoretic coating involves mixing graphene oxide dispersion with an amination reagent and pumping into microreactor for amination reaction to obtain aminated graphene, mixing aminated graphene and organic acid with ultrasound, filtering and washing for many times until the dispersion is weakly acidic to obtain functionalized graphene dispersion, homogenizing the functionalized graphene dispersion and negative electrode electrophoretic coating paste through a homogenizer, mixing the negative electrode electrophoretic coating emulsion and functionalized graphene-modified electrophoretic coating and deionized water to obtain functionalized graphene-modified negative electrode electrophoretic coating working solution, and using the working solution to carry out electrophoretic coating film, baking and curing at high temperature, to provide coating film having thickness of 18-22 μm, hardness of 5H, and the neutral salt spray time is reached 1500 hours. An INDEPENDENT CLAIM is included for usage method of the functional graphene for modified negative electrode electrophoretic coating.