▎ 摘　　要

NOVELTY - Preparation of graphene phase-change energy-storage microcapsules with double-layer wall material structure, involves mixing styrene maleic anhydride with water, adding sodium hydroxide solution, stirring, adjusting pH, emulsifying core material phase change material using styrene maleic anhydride, titrating wall material methyl melamine formaldehyde resin prepolymer into emulsion liquid, warming while stirring, then slowly titrating with acetic acid solution, adjusting pH to 7, reacting to form inner wall material, and reducing the temperature to room temperature. USE - Preparation of graphene phase-change energy-storage microcapsules with double-layer wall material structure (claimed). ADVANTAGE - The microcapsules wall material contains nano-graphene, which can greatly increase the endothermic heat release rate of the core material phase-change material, and the double-layer structure can greatly improve the strength and thermal stability of the microcapsules. DETAILED DESCRIPTION - Preparation of graphene phase-change energy-storage microcapsules with double-layer wall material structure which has inner wall material of methyl melamine formaldehyde resin, and outer wall material as composite material of methyl melamine formaldehyde resin and nano-graphene, involves mixing styrene maleic anhydride with water, adding 5 wt.% sodium hydroxide solution, stirring at 300 rpm for 2 hours, adjusting the pH to 10, emulsifying core material phase change material using styrene maleic anhydride at an emulsification rate of 1000-2000 rpm for 5 minutes, titrating the wall material methyl melamine formaldehyde resin prepolymer into emulsion liquid at a rate of 5 ml/minute and then warming to 60 degrees C while maintaining a stirring speed of 300 rpm, then slowly titrating with 2 wt.% acetic acid solution at a rate of 1 ml/minute, adjusting the pH to 7 and reacting for 1 hour to form inner wall material and then lowering the temperature to room temperature, dispersing nano-graphene with 5 wt.% polyvinyl alcohol, titrating the mixture of methyl melamine formaldehyde resin prepolymer and nano-graphene-polyvinyl alcohol in the emulsion liquid which is used for forming the inner wall material at a titration speed of 1 ml/minute, then stirring the mixture at a rate of 1 ml/minute, dripping acetic acid, adjusting pH to 7, and increasing the temperature to 80 degrees C at a rate of 2 degrees C/minute, carrying out reaction for 3 hours while maintaining the stirring rate at 300 rpm, and forming outer wall material, then allowing the temperature to cool to room temperature by natural cooling while stirring at 300 rpm, separating the solution by filtration, separating microcapsules and drying to obtain graphene phase-change energy-storage microcapsule with double wall structure.