Preparation method for paraffin microcapsule phase-change material modified by graphene oxide

Abstract

The invention discloses a preparation method for a paraffin microcapsule phase-change material modified by graphene oxide. A technical scheme is that the preparation method comprises the following steps: adding concentrated acid and a strong oxidant in low-temperature ice-water bath to oxidize graphite; successively adding deionized water, hydrogen peroxide and hydrochloric acid, carrying out vacuum filtration, drying and grinding to obtain graphene oxide, adding the graphene oxide into the deionized water to prepare the graphene oxide liquor; adding paraffin, a non-ionic emulsifier and an ionic emulsifier into a stirring kettle, heating and adding graphite to stir to obtain paraffin emulsion; and adding an initiator into the paraffin emulsion to dissolve and dropwise adding monomers, carrying out vacuum filtration after the dropwise adding, carrying out petroleum ether washing and water washing, drying in vacuum and crushing to obtain paraffin microcapsule powder. The preparation method has the beneficial effect that the thermal stability, and the thermal conductivity of the paraffin microcapsule phase-change material are improved by virtue of reaction of multiple oxygen-containing groups on the graphite oxide and the polymer; and moreover, the paraffin microcapsule phase-change material is simple to prepare, environmentally friendly, and has market prospect in the fields such as building energy conservation, thermal insulation products and floor heating.

Description

technical field [0001] The invention belongs to the field of functional polymer materials, and in particular relates to a preparation method of a graphene oxide modified paraffin microcapsule phase change material. Background technique [0002] Phase state energy storage-energy release materials (PCMs) have the characteristics of automatic heat absorption and release, and can effectively control the temperature within a specific temperature range. At present, they are gradually being applied in the fields of building energy conservation and thermal insulation materials. Microcapsule phase change materials (MicroPCMs) use microcapsule technology to coat phase change materials to form particulate composite phase change materials with a size of 1 μm-1000 μm. MicroPCMs can effectively solve the PCMs leakage problem, prevent the phase change material from reacting with the surrounding environment, improve the use efficiency of the phase change material, and increase the heat tran...

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Problems solved by technology

[0004] Aiming at the many shortcomings of current microcapsules, the present invention provides a preparation method of graphene oxide modified paraffin microcapsule phase change material, which uses the high specific surface area and high thermal conductivity of graphene oxide to improve the thermal conductivity of the wrapping material; utilizes the shell Negatively charged monomers are copolymerized with materials, and the core material is emulsified with cationic emulsifiers to provide wrapping power and improve wrapping efficiency; an O / W type highly dispersed and highly stable phase-change paraffin wax emulsion is prepared by inverse emulsification method, and then Through the principle of core-shell in-situ polymerization, a microcapsule phase change material with a core-shell structure is formed

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