▎ 摘　　要

NOVELTY - Functionalized aqueous polyurethane material is mainly prepared from 10-20 pts. wt. polyester polyol, 5-15 pts. wt. diisocyanate, 1-2 pts. wt. hydrophilic chain extender, 0.1-0.5 pt. wt. catalyst, 1-3 pts. wt. diethylene glycol terephthalate, 0.5-0.15 pts. wt. graphene oxide, 0.25-0.75 pts. wt. internal crosslinking agent, 3-16 pts. wt. organic solvent, 4-6 pts. wt. diluent, 0.5-1 pt. wt. neutralizing agent and 70-90 pts. wt. water. USE - The polyurethane material is used in the applications of fifth generation (5G) communication materials and electronic packaging materials (claimed). ADVANTAGE - The method overcomes the shortcomings of poor compatibility between graphene and polyurethane, and easy agglomeration, and the prepared polyurethane material has excellent electrical conductivity, thermal conductivity and mechanical properties. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a preparation method of the functionalized aqueous polyurethane material, involving (a) performing ultrasonic treatment of diethylene glycol terephthalate and graphene oxide (GO) in an organic solvent, followed by heat treatment at 80-100degrees Celsiusfor 1-2 hours, to obtain graphene oxide-supported diethylene glycol terephthalate (BHET) chain extender, marked as BHET-GO, or subjecting the graphene oxide-supported BHET chain extender to a reduction reaction through a reducing agent to obtain a reduced graphene-supported BHET chain extender, which is marked as BHET-G, (b) mixing polyester polyol with diisocyanate and hydrophilic chain extender, adding catalyst, and reacting at 80-100degrees Celsius to obtain polyurethane prepolymer, where the mixing refers to stirring at 80-100degrees Celsius for 1-2 hours, and the reaction time is 20-40 minutes, (c) dispersing the graphene oxide supported BHET chain extender or the reduced graphene supported BHET chain extender in an organic solvent to obtain a chain extender dispersion, mixing the chain extender dispersion, the polyurethane prepolymer and the internal crosslinking agent, reacting at 50-70degrees Celsius for 2-4 hours, adding diluent during the reaction for dilution, subsequently adding a neutralizing agent for neutralization, and adding water to emulsify to obtain a polyurethane emulsion, and (d) forming the polyurethane emulsion into a film to obtain a functionalized aqueous polyurethane material.