Method for preparing graphene oxide modified composite phase-change microcapsule

Abstract

The invention discloses a method for preparing graphene oxide modified composite phase-change microcapsules. The method specifically comprises the following steps: preparing a graphene oxide solid from graphite powder, concentrated sulfuric acid, sodium nitrate, potassium permanganate and deionized water; mixing the obtained graphene oxide solid with absolute ethyl alcohol and a silane coupling agent, and performing a reaction so as to obtain a double-bond modified functional graphene oxide solid; uniformly mixing the obtained functional graphene oxide solid with a phase-change material, a reaction monomer, a cross-linking agent, a reactive emulsifier and deionized water, and performing ultrasonic dispersion so as to form an oil-in-water type pre-emulsion; and putting the obtained oil-in-water type pre-emulsion into a hot water bath, continuously stirring, further adding an initiator solution, and performing a heat-preservation reaction, thereby obtaining the graphene oxide modified composite phase-change microcapsules. By adopting the method disclosed by the invention, composite phase-change microcapsules which are high in encapsulation efficiency, stable in property, good in heat conductivity, appropriate in phase-change temperature and relatively high in phase-change latent heat enthalpy can be prepared.

Description

technical field [0001] The invention belongs to the technical field of preparation methods of phase-change microcapsules, and in particular relates to a preparation method of graphene oxide-modified composite phase-change microcapsules. Background technique [0002] In recent years, with the global energy shortage, resource depletion and environmental pollution becoming more and more serious, improving energy efficiency and developing renewable resources are important issues facing mankind. Among them, since phase change materials can automatically absorb or release latent heat to the environment to adjust their own stored heat within a certain temperature range by using the changes in the phase or structure of the material itself, it has important research in alleviating the energy crisis and improving energy efficiency. significance. Phase-change microcapsule materials use microcapsule encapsulation technology to coat phase-change materials with organic polymer materials ...

AI Technical Summary

Problems solved by technology

[0004] Publication No. CN104212416A discloses a preparation method of a graphene oxide modified paraffin microcapsule phase change material with paraffin as the core material and polyacrylate polymer as the wall material. The thermal stability and thermal conductivity of the capsule phase change material prolong the service life; however, graphene oxide is amphiphilic and mainly exists on the surface of the oil-in-water (O / W) emulsion system during the reaction process, and neither participates in Reaction, poor compatibility with phase change microcapsules; at the same time, small molecule emulsifiers are added in the paraffin emulsification process, which will have a certain impact on phase change microcapsules and the environment