High-thermal-conductivity composite phase change energy storage microcapsules used at normal temperature and preparation method thereof

Abstract

The invention relates to high-thermal-conductivity composite phase change energy storage microcapsules used at normal temperature and a preparation method thereof. The high-thermal-conductivity composite phase change energy storage microcapsules comprise organic phase change capsule cores and inorganic high-thermal-conductivity capsule walls, wherein the organic phase change capsule cores are prepared from two or more than two of alkane, fatty acids, polyether and derivatives of the polyether. The preparation method comprises the steps of: (1) preparing a capsule core material with an adjustable phase-transition temperature, (2) preparing an O / W (oil-in-water) emulsion; and (3) preparing the phase change energy storage microcapsules: dropwise adding tetraethylortho silicate to the emulsion, stirring for 1-6 hours at a speed of 300-1000rpm, aging and drying, thus obtaining the stable phase change energy storage microcapsules. The high-thermal-conductivity composite phase change energy storage microcapsules have the characteristics of high energy storage, high thermal conductivity, stable performance, designable and adjustable phase change temperature, suitability for various processing and the like and can be popularized and applied in industries such as energy-saving walls of buildings, commodity storage and transportation, medical equipment, food packaging and thermoregulation clothes.

Description

【Technical field】 [0001] The invention relates to the technical field of adjustable and controllable phase change materials for normal temperature, in particular to a high thermal conductivity composite phase change energy storage microcapsule for normal temperature and a preparation method thereof. 【Background technique】 [0002] Energy storage using material phase change latent heat is a new technology in the field of energy utilization. Phase change energy storage uses materials to absorb or release heat during the phase change process to store or release energy. It has the characteristics of high heat storage density, approximately isothermal heat storage and release, and easy control of the process. Organic phase change materials The advantages are that supercooling and phase separation are not easy to occur, the material is less corrosive, the performance is relatively stable, the toxicity is small, and the cost is low. Commonly used organic phase change materials inc...

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Problems solved by technology

[0003] (1) The liquid in the solid-liquid phase transition process of these materials leaks and pollutes the environment;

[0004] (2) The thermal conductivity of organic phase change materials is poor (the thermal conductivity is about 0.2W / mK), which affects the utilization rate of heat enthalpy;

[0006] There are many ways to modify the shape of phase change materials: (1) Porous packaging, expanded graphite filled phase change materials can obtain composite materials with good thermal conductivity and high energy storage density, but there are defects such as compression deformation and poor shape setting ; (2) Adding support materials with high melting point, when the occurrence temperature is higher than the phase transition temperature, due to the spatial limitation of the liquid by the shaping component, the macroscopically fixed shape is maintained, but due to the long-term use of the phase change material, there will be substrate Issues such as aging and separation of phase change materials from setting components

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