▎ 摘　　要

NOVELTY - Nano-encapsulated binary composite phase change material comprises a core material and a capsule wall covering the core material, where the core material includes a solvent, and reduced graphene oxide polydimethylsiloxane modified phase change material. The phase change material is prepared by heating 8-20 pts. wt. solvent at 70 degrees C, adding 1-2 pts. wt. reduced graphene oxide polydimethylsiloxane modified phase change material into the solvent, and keeping; adding 0.3-1 pts. wt. emulsifier into the solution prepared in the step (i); adding 10-40 pts. wt. capsule wall material, heating, stirring and reacting, adding 1-5 pts. wt. urea, filtering and washing after cooling to obtain a binary composite phase change material emulsion; dropping to the binary composite phase change material emulsion obtained in the third step to break the emulsion, obtaining the product by centrifugal separation, washing the product with petroleum ether for many times and drying. USE - Used as nano-encapsulated binary composite phase change material. ADVANTAGE - The nano-encapsulated binary composite phase change material has excellent thermal conductivity and a stable structure, good compatibility with building materials, excellent heat-conducting performance, stable structure, long-term exerting effect, good compatibility with the building material, and does not affect the related mechanical property of the building material. DETAILED DESCRIPTION - Nano-encapsulated binary composite phase change material comprises a core material and a capsule wall covering the core material, where the core material includes a solvent, and reduced graphene oxide polydimethylsiloxane modified phase change material. The phase change material is prepared by heating 8-20 pts. wt. solvent at 70 degrees C, adding 1-2 pts. wt. reduced graphene oxide polydimethylsiloxane modified phase change material into the solvent, and keeping for 0.5-2 hours after ultrasonic assisted dispersion; adding 0.3-1 pts. wt. emulsifier into the solution prepared in the step (i), and the pH value is adjusted to 4 and dispersed with the aid of ultrasound; adding 10-40 pts. wt. capsule wall material, heating to 90 degrees C, stirring and reacting for 2 hours, adding 1-5 pts. wt. urea, filtering and washing after cooling to obtain a binary composite phase change material emulsion; dropping to the binary composite phase change material emulsion obtained in the third step to break the emulsion, obtaining the product by centrifugal separation, washing the product with petroleum ether for many times and drying to obtain a powdered nano-encapsulated binary composite phase change material.