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Bifunctional micro-encapsulation phase-change energy storage material with photo-catalysis property and preparation method thereof

A phase-change energy storage material and energy storage material technology, applied in the field of dual-functional microcapsule phase-change energy storage materials with photocatalytic properties and its preparation, can solve problems such as failure, easy leakage, and difficult to stabilize, and achieve heat The release and storage process is stable and safe, with high chemical stability and good photocatalytic activity

Active Publication Date: 2014-08-20
上海弈峋科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these phase change materials have high phase change enthalpy and energy storage density, there is a major defect in the process of use: they undergo a physical state change from solid to liquid to solid every time they absorb and release latent heat; when the phase change It is difficult for the material to exist stably when it is in a liquid state, and it is easy to leak and lose, which leads to poor phase change reversibility after multiple phase change cycles, and eventually fails
For example, U.S. Patent US6270836B1 uses the sol coating method to form organic / inorganic microcapsule phase change energy storage materials, but the prepared microcapsule materials only have the function of storing and releasing heat energy to achieve temperature control

Method used

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  • Bifunctional micro-encapsulation phase-change energy storage material with photo-catalysis property and preparation method thereof
  • Bifunctional micro-encapsulation phase-change energy storage material with photo-catalysis property and preparation method thereof
  • Bifunctional micro-encapsulation phase-change energy storage material with photo-catalysis property and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Add 35g of n-eicosane to 250mL formamide solution containing 8.3g of anionic surfactant (sodium lauryl sulfate), then add 15g of tetrabutyl titanate to the above solution, and place in an oil bath at 45°C , stirred and emulsified at a speed of 600 rpm for 2.5 hours to form a stable O / W emulsion, and uniformly disperse tetrabutyl titanate around the emulsified oil droplets. Slowly add 150mL formamide solution containing 12.5g deionized water dropwise, so that tetrabutyl titanate undergoes hydrolysis and polycondensation reaction on the surface of emulsified oil droplets, continue to stir for 5-6h, add 5g of sodium fluoride powder, and stir at 70°C for 24h Then stop stirring and cool naturally to obtain a precipitation solution, which is filtered, washed with absolute ethanol and deionized water, and then air-dried to obtain a microcapsule phase-change energy storage material coated with crystalline titanium dioxide and n-eicosane. The surface is smooth and dense, with a ...

Embodiment 2

[0044] 35g n-octadecane was added to 250mL formamide solution containing 10g cationic surfactant (hexadecyltrimethylammonium bromide), then 15g tetraisopropyl titanate was added to the above solution, at 45 °C in an oil bath, stir and emulsify at a speed of 800 rpm for 2.5 hours to form a stable O / W emulsion, and evenly disperse tetraisopropyl titanate around the emulsified oil droplets. Slowly add 150mL formamide solution containing 10g deionized water dropwise, so that tetraisopropyl titanate undergoes hydrolysis and polycondensation reaction on the surface of emulsified oil droplets, continue stirring for 5-6h, add 5g ammonium fluoride powder, and stir at 70°C for 24h Then stop stirring and cool naturally to obtain a precipitation solution, which is filtered, washed with absolute ethanol and deionized water, and then air-dried to obtain a microcapsule phase-change energy storage material coated with n-octadecane in crystalline titanium dioxide. The surface is smooth and den...

Embodiment 3

[0046] Add 30g n-nonadecane to 250mL acetonitrile / ethanol mixed solvent (volume ratio is 1 / 3) containing 10g nonionic surfactant (PEO-PPO-PEO), then add 20g tetrabutyl titanate to the above In the solution, stir and emulsify at 600 rpm for 2.5 hours in an oil bath at 45° C. to form a stable O / W emulsion, and evenly disperse tetrabutyl titanate around the emulsified oil droplets. Slowly add 150mL of acetonitrile / ethanol mixed solvent containing 10g of deionized water (volume ratio: 1 / 3), so that tetrabutyl titanate undergoes hydrolysis and polycondensation reaction on the surface of emulsified oil droplets, continue stirring for 5-6h, add 5g of chloride Ammonium powder, stirred at 70°C for 24 hours, then stopped stirring and cooled naturally to obtain a precipitation solution, which was filtered, washed with absolute ethanol and deionized water, and dried naturally to obtain crystalline titanium dioxide coated n-nonadecane The microcapsule phase change energy storage material h...

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Abstract

The invention discloses a bifunctional micro-encapsulation phase-change energy storage material with a photo-catalysis property and a preparation method thereof. A core material of the bifunctional micro-encapsulation phase-change energy storage material is a phase-change material such as high-grade aliphatic alkane, alcohol, acid, acid ester and the like, and a wall material of the bifunctional micro-encapsulation phase-change energy storage material is crystalline titanium dioxide or element-doped crystalline titanium dioxide with the photo-catalysis property. The preparation method comprises the steps of mixing and stirring 2.0-3.4wt.% of surfactant, 79.0-80.0wt.% of solvent, 6.0-10.0wt.% of phase-change energy storage material and 4.5-8.5wt.% of titanium source in percentage by weight to form a stable emulsion; adding mixed liquid of the solvent and water to initiate reaction; then adding 0.0-3.0wt% of crystallization induction additive in percentage by weight to obtain the micro-encapsulation phase-change energy storage material of a crystalline titanium dioxide coated organic phase-change material. The micro-encapsulation phase-change energy storage material of an element-doped crystalline titanium dioxide coated organic phase-change material can be obtained by adding a product into a metal solution or non-metal solution while stirring.

Description

technical field [0001] The invention relates to a dual-function microcapsule phase-change energy storage material and a preparation method thereof, in particular to a dual-function microcapsule phase-change energy storage material with photocatalytic properties using crystalline titanium dioxide or element-doped crystalline titanium dioxide as the wall material Materials and their preparation methods. Background technique [0002] Energy is the basis for human survival and development. In today's society, with the rapid development of global industry, energy is increasingly scarce. Improving energy efficiency and developing renewable energy are important issues facing mankind at present. Among them, thermal energy storage plays a prominent and important role in the research technology of energy materials. Phase change energy storage is a way of thermal energy storage, which uses the phase change latent heat of phase change energy storage materials to realize energy storag...

Claims

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Application Information

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IPC IPC(8): C09K5/06B01J21/06B01J23/75B01J23/80A01N59/16A01P1/00A01P3/00C02F1/32
CPCY02W10/37
Inventor 汪晓东柴路晓武德珍
Owner 上海弈峋科技有限公司
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