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

A composite phase transition and high thermal conductivity technology, applied in the preparation of microspheres, microcapsule preparations, chemical instruments and methods, etc., can solve the problems of affecting the utilization rate of enthalpy, poor shapeability, poor thermal conductivity, etc. Transfer and conversion, low thermal expansion coefficient, good energy storage effect

Inactive Publication Date: 2013-04-10
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0034] (1) Set the mass ratio of octanoic acid and palmitic acid to 9:1, fully mix them at a constant temperature of 40-100°C for 0.5-5 hours, and use the product as a capsule core material for future use;

[0035] (2) Add surfactant, water, capsule core material, etc. into the beaker to adjust the pH value to 3-5, and emulsify for 3-10 minutes to make a uniform emulsion;

[0036] (3) Slowly add a certain amount of tetraethyl orthosilicate (the ratio of core to ester is 0.5:1) to the above-mentioned emulsion, react at a certain temperature for 1 to 6 hours, age, and finally wash and dry to make high-grade Heat conduction phase change energy storage microcapsules.

Embodiment 2

[0038] (1) Set the mass ratio of capric acid and stearic acid to 9:1, and mix them thoroughly at a constant temperature of 40-100°C for 0.5-5 hours, and the product is used as a capsule core material for later use;

[0039] (2) Add surfactant, water, capsule core material, etc. into the beaker to adjust the pH value to 3-5, and emulsify for 3-10 minutes to make a uniform emulsion;

[0040] (3) Slowly add a certain amount of tetraethyl orthosilicate (the core-ester ratio is 1:1) dropwise into the above-mentioned emulsion, react at a certain temperature for 1 to 6 hours, age, and finally wash and dry to make high-grade Heat conduction phase change energy storage microcapsules.

Embodiment 3

[0042] (1) Set the mass ratio of PEG600 and PEG1000 to 9:1, and mix them thoroughly at a constant temperature of 40-100°C for 0.5-5 hours, and use the product as a capsule core material for later use;

[0043] (2) Add surfactant, water, capsule core material, etc. into the beaker to adjust the pH value to 3-5, and emulsify for 3-10 minutes to make a uniform emulsion;

[0044] (3) Slowly add a certain amount of tetraethyl orthosilicate (the ratio of core to ester is 1.5:1) dropwise to the above emulsion, react at a certain temperature for 1 to 6 hours, age, and finally wash and dry to make high temperature Heat conduction phase change energy storage microcapsules.

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/02B01J13/02
Inventor 魏婷郑柏存郭卫红易红玲公维光林珩王贞陈林超吴聪
Owner EAST CHINA UNIV OF SCI & TECH
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