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Preparation method of cement-based paraffin phase change energy storage material

A phase change energy storage material and a phase change material technology, which are applied in the field of phase change energy storage building materials, can solve the problems of unfavorable large-scale popularization and application, uneven distribution of thickness of calcium carbonate wall materials, etc. The effect of small influence and easy pouring and forming

Pending Publication Date: 2021-11-12
HEFEI UNIV OF TECH
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  • Description
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AI Technical Summary

Problems solved by technology

Patent CN109054768A prepared paraffin@calcium carbonate phase-change microcapsules with high encapsulation rate and good anti-seepage performance by adding calcium chloride solution to paraffin wax emulsion, mixing evenly and dripping sodium carbonate solution. The uneven distribution around the paraffin wax particles will lead to uneven distribution of the thickness of the calcium carbonate wall material, and because the calcium carbonate morphology has an important impact on the performance of the phase change microcapsules, it is necessary to strictly control the pH of the system, which is not conducive to large-scale promotion and application

Method used

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  • Preparation method of cement-based paraffin phase change energy storage material

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Effect test

Embodiment 1

[0023] 1) Mix Span-80 and Tween-80 to prepare an emulsifier with an HLB of 10;

[0024] 2) Heat and melt 45g of paraffin and 22.5g of emulsifier in a water bath, then add 157.5g of water at a temperature of 80°C to the melt in a colloid mill with a stirring speed of 1000r / min to prepare an oil-in-water emulsion, and continue stirring for 40min to ensure sufficient Emulsification, the emulsification rate reaches 100%, and the average particle size of the paraffin phase particles is about 0.9 μm;

[0025] 3) Stir 500g of ordinary Portland cement (P.O 52.5) ​​cement, 0.75g of polycarboxylate superplasticizer, 42.5g of water and 225g of oil-in-water paraffin emulsion and pour them into shape. Emulsion-based cement-based phase-change energy storage materials.

Embodiment 2

[0027] 1) Mix Span-20 and Tween-20 to prepare an emulsifier with an HLB of 12;

[0028] 2) Heat and melt 55g of paraffin and 22g of emulsifier in a water bath, then add 143g of water at a temperature of 75°C to the melt in a colloid mill with a stirring speed of 800r / min to prepare an oil-in-water emulsion, and keep stirring for 50min to ensure full emulsification. The emulsification rate reaches 93.2%, and the average particle size of the paraffin phase particles is about 1.2 μm;

[0029] 3) Stir 500g of ordinary Portland cement (P.O 52.5) ​​cement, 0.5g of naphthalene-based superplasticizer, 47g of water, and 220g of oil-in-water paraffin emulsion, and pour them into shapes. The standard curing is 28 days, and the oil-in-water emulsion is prepared. Cement-based phase change energy storage materials.

Embodiment 3

[0031] 1) Mix Span-20 and Tween-20 to prepare an emulsifier with an HLB of 10;

[0032] 2) Heat and melt 35g of paraffin and 15g of emulsifier in a water bath, then add 102g of water at a temperature of 75°C to the melt in a colloid mill with a stirring speed of 1100r / min to prepare an oil-in-water emulsion, and keep stirring for 35min to ensure full emulsification. The emulsification rate reaches 90.2%, and the average particle size of the paraffin phase particles is about 1.5 μm;

[0033] 3) Stir 500g of ordinary Portland cement (P.O 52.5) ​​cement, 1g of SMF superplasticizer, 108g of water and 152g of oil-in-water paraffin emulsion and pour them into shape. The standard curing is 28 days, and the cement-based oil-in-water emulsion is obtained. Phase change energy storage materials.

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Abstract

The invention discloses a preparation method of a cement-based paraffin phase change energy storage material, which comprises the following steps: emulsifying paraffin, uniformly dispersing the emulsified paraffin with small particle size in water to prepare an oil-in-water emulsion with stable performance, diluting the emulsion, compounding the diluted emulsion with a cementing material, adding a water reducing agent to improve the flowability of the phase-change energy storage material, and packaging the phase change material through hydration hardening of the cementing material, so as to prepare the phase change energy storage material. The phase change material in the cement-based phase change energy storage material prepared by the invention is uniform in dispersion, excellent in mechanical and thermal properties, good in packaging effect and excellent in durability.

Description

technical field [0001] The invention belongs to the field of phase-change energy storage building materials, and in particular relates to a preparation method of a cement-based paraffin phase-change energy storage material. Background technique [0002] Phase change energy storage building materials are thermal functional materials that organically combine phase change materials and building materials. Through phase change materials, energy is stored / released to achieve energy conversion at different times and spatial locations. It has broad application potential in the field of ecological buildings. development prospects. Organic solid-liquid phase change energy storage materials represented by paraffin, due to the advantages of no supercooling and phase separation, small volume change when phase transition occurs, non-toxic and non-corrosive, are used to combine with cement-based materials to obtain cement-based phase change materials. change material. [0003] The metho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/02C09K5/02
CPCC04B28/02C09K5/02C04B2201/50C04B24/36C04B24/06C04B24/045C04B2103/302
Inventor 詹炳根李景哲陈文余其俊杨永敢洪丽
Owner HEFEI UNIV OF TECH
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