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Microencapsulated multi-component inorganic phase-change material and preparation method thereof

A technology of inorganic phase change materials and microcapsules, applied in microcapsule preparations, microsphere preparation, heat exchange materials, etc., can solve the problems of phase change enthalpy drop, supercooling, poor coating effect, etc., and achieve thermal stability Good properties, simple preparation method, and easy-to-obtain raw materials

Inactive Publication Date: 2012-05-30
BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Na 2 SO 4 10H 2 O, like most inorganic hydrated salts, has two serious problems: one is supercooling, and the other is phase separation.
[0006] Microcapsules coated phase change materials can improve the processability of phase change materials, enhance the heat transfer performance of phase change materials, and improve the stability of phase change materials. However, the use of microcapsules to coat multi-component inorganic phase change materials in In the actual operation process, there are problems such as poor coating effect, sharp drop in phase change enthalpy, and difficulty in practical application.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Get ammonium sulfate 2g, ammonium chloride 18g, boric acid 5g, borax 0.5g, carboxymethyl cellulose 0.5g and crystalline sodium sulfate 50g mix, prepare the core material of the crystalline sodium sulfate base phase-change material of multi-component, standby,

[0026] Stir 2g of polymethyl methacrylate and 4g of ethyl acetate at 0-4°C until the polymethyl methacrylate dissolves to make a wall material solution, and then take the multi-component crystalline sodium sulfate-based phase change prepared above Add 5g of the material to 5g of deionized water at 0-4°C, stir evenly to make it completely dissolve in water, and add 1.25g of emulsifier Span80 to make a core material solution, mix the above wall material solution with the core material solution, and rotate at 10 rpm Carry out emulsification at different speeds for 30 minutes, add the obtained emulsion dropwise to 51.75g ​​of deionized water at 0-4°C, stir to form a white viscous emulsion, place it under ice bath for ...

Embodiment 2

[0029] Get ammonium sulfate 4g, ammonium chloride 12g, boric acid 3g, borax 3g, sodium hexametaphosphate 1g, carboxymethylcellulose 5g and crystalline sodium sulfate 70g, prepare the core material of the crystalline sodium sulfate base phase-change material of multicomponent, spare,

[0030]Stir 2g of polymethyl methacrylate and 8g of ethyl acetate at 0-4°C until the polymethyl methacrylate dissolves to make a wall material solution, and then take the multi-component crystalline sodium sulfate-based phase change prepared above Add 10g of the material to 30g of deionized water at 0-4°C, stir evenly to make it completely dissolve in water, and add 5g of emulsifier Span80 to make a core material solution, mix the above-mentioned wall material solution and core material solution, and run at 100 rpm Emulsify at a high speed for 15 minutes, add the obtained emulsion dropwise to 220g of deionized water at 0-4°C, stir to form a white viscous emulsion, place it in an ice bath for 5 hou...

Embodiment 3

[0032] Get ammonium sulfate 6g, potassium chloride 8g, boric acid 0.5g, borax 5g, sodium hexametaphosphate 2g, carboxymethyl cellulose 6g and crystalline sodium sulfate 90g, prepare the core material of the crystalline sodium sulfate-based phase change material of multicomponent ,spare,

[0033] Stir 2g of polymethyl methacrylate and 12g of ethyl acetate at 0-4°C until the polymethyl methacrylate dissolves to make a wall material solution, and then take the multi-component crystalline sodium sulfate-based phase change prepared above Add 12g of material to 48g of deionized water at 0-4°C, stir well to make it completely dissolve in water, and add 7.6g of emulsifier Span80 to make a core material solution, mix the above wall material solution and core material solution at 500 rpm Emulsify at high speed for 10 minutes, add the obtained emulsion dropwise to 367.2g deionized water at 0-4°C, stir to form a white viscous emulsion, place it under ice bath for 6 hours, make the ethyl a...

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Abstract

The invention relates to a microencapsulated multi-component inorganic phase-change material which comprises polymethyl methacrylate as a shell material and a multi-component crystalline sodium sulfate-based phase-change material as a core material. The material is prepared by the following steps: stirring the shell material at 0-4 DEG C to make a shell material solution; mixing the shell material solution with a core material solution composed of core material, deionized water and emulsifiers; emulsifying; adding dropwise deionized water into the resulting emulsion and mixing to form a white viscous emulsion; standing in an ice bath to allow complete volatilization of ethyl acetate; washing and separating the resulting microcapsule-containing emulsion with petroleum ether; and freeze-drying to obtain the microencapsulated multi-component inorganic phase-change material product. The product is innoxious and non-corrosive. The phase change temperature of the product is 11-20 DEG C and the phase change enthalpy is 62-65 kJ / kg. The product is good in heat stability and has the advantages and benefits of simple preparation method, easily-accessible raw material and low cost.

Description

technical field [0001] The invention relates to a multi-component inorganic phase-change material coated with microcapsules. Polymethyl methacrylate is used as a wall material, and a multi-component crystalline sodium sulfate-based phase-change material is used as a core material, which belongs to the inorganic phase-change material. [0002] The invention also relates to a preparation method of the multi-component inorganic phase change material. Background technique [0003] The microencapsulation of phase change materials can undergo phase change in the microcapsules of polymers, and achieve temperature regulation or energy storage effects by absorbing and releasing heat, which solves the problem of difficult storage and heat transfer rate of phase change materials during use. Slow and other problems, but also can increase the specific surface area of ​​the phase change material, improve the heat transfer effect. [0004] Crystalline sodium sulfate (Na 2 SO 4 10H 2 O)...

Claims

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Application Information

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IPC IPC(8): C09K5/06B01J13/02
Inventor 刘太奇师奇松于建香刘瑞雪
Owner BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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