▎ 摘　　要

NOVELTY - Making (M1) coating dispersion, comprises: (a) mixing graphene particles, fluorosilane coupling agent and first solvent to produce first dispersion, where graphene particles are present at 0.1-0.8 wt.% of first dispersion; (b) concentrating first dispersion by removing first solvent to form concentrated dispersion, where graphene particles are present at 2-10 wt.% of the dispersion; (c) mixing concentrated dispersion with fluoropolymer particle dispersion comprising second solvent, surfactant and fluoropolymer particles; and (d) adding polymer binder in third solvent to second dispersion. USE - The method is useful for making a coating dispersion, which is useful: for manufacturing a surface layer (all claimed); and in a release layer of a fuser member. ADVANTAGE - The method provides uniform graphene particle/fluoropolymer particle dispersion, which is electrically conductive, thermally conductive and/or mechanically robust, exhibits improved stability, and provides void free coating. DETAILED DESCRIPTION - Making (M1) a coating dispersion, comprises: (a) mixing graphene particles, a fluorosilane coupling agent and a first solvent to produce a first dispersion, where the graphene particles are present at 0.1-0.8 wt.% of the first dispersion; (b) concentrating the first dispersion by removing the first solvent to produce a concentrated dispersion, where the graphene particles are present at 2-10 wt.% of the concentrated dispersion; (c) mixing the concentrated dispersion with a fluoropolymer particle dispersion comprising a second solvent, a surfactant and fluoropolymer particles, where the fluoropolymer particle dispersion has a solids content of 30-50 wt.% to form a second dispersion; and (d) adding a polymer binder in a third solvent to the second dispersion to form the coating dispersion, where the coating dispersion has a viscosity of 10-200 centipoise. An INDEPENDENT CLAIM is also included for manufacturing (M2) a surface layer, comprising: the step (a) as above per se; concentrating the first dispersion by removing the first solvent and the fluorosilane coupling agent to produce a concentrated dispersion, where the graphene particles are present at 2-10 wt.% of the concentrated dispersion; mixing the concentrated dispersion with a perfluoroalkoxy polymer resin (PFA) dispersion comprising the second solvent, the surfactant and PFA particles, where the PFA dispersion has a solids content of 30-50 wt.% to form a second dispersion; and the step (d) as above per se; providing a substrate; coating the coating dispersion on the substrate; and curing the coating dispersion.