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Preparation method of gypsum and clay composite phase-change energy storing material

A composite phase change and clay technology, applied in the direction of heat exchange materials, chemical instruments and methods, etc., can solve problems such as leakage, and achieve the effect of stable thermal performance and high strength

Active Publication Date: 2014-11-19
BEIJING UNIV OF CHEM TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation of the composite material is to impregnate the porous material in the phase change material, and take it out after it is saturated with adsorption. However, this type of composite material is prone to leakage at too high a temperature, so the problem of its packaging must be considered

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Dissolve 25g of paraffin wax with a melting point of 56°C and a latent heat of phase transition of 231.08J / g in 200ml of absolute ethanol, then add 100g of activated attapulgite with a purity of 95%, stir well, and place the mixture at a temperature of 80°C Then, take 100ml of water glass solution with a concentration of 10g / L and a modulus of 3.2, mix and refine the mud, and extrude and granulate through a granulator to obtain a composite phase change precursor. Mix evenly with 300g of semi-hydrated natural gypsum, add 300ml of water, 3g of white latex, 2.4g of sodium dodecylsulfonate, and 0.06g of citric acid, stir, pour into shape, dry and demould, and maintain to obtain the gypsum-clay composite phase energy storage material. The phase change temperature of the composite phase change energy storage material is 55.9°C, the phase change enthalpy is 16.23J / g, the flexural strength is 2.08MPa, and the compressive strength is 3.56MPa.

Embodiment 2

[0025] Dissolve 25g of decanoic acid with a melting point of 31.5°C and a latent heat of phase transition of 166.08J / g in 200ml of absolute ethanol, then add 100g of activated bentonite, stir well, then place the mixture at a temperature of 80°C, and let it stand for adsorption , dry and pulverize, then take 100ml of water glass solution with a concentration of 10g / L and a modulus of 3.2, mix and refine the mud, extrude and granulate through a granulator to obtain a composite phase change precursor, and then desulfurize with 300g hemihydrate Mix the gypsum evenly, add 300ml of water, 3g of peach gum, 2.4g of sodium dodecylbenzene sulfonate, and 1g of sodium citrate, stir, pour into shape, dry out the mold, and cure to obtain the gypsum-clay composite phase change energy storage material . The phase change temperature of the composite phase change energy storage material is 30.8°C, the phase change enthalpy is 10.28J / g, the flexural strength is 2.03MPa, and the compressive stre...

Embodiment 3

[0027] Dissolve 20g of myristyl alcohol with a melting point of 38°C and a latent heat of phase transition of 214.5J / g in 200ml of absolute ethanol, then add 100g of clay mixture containing 30% attapulgite and 70% silicon dioxide, and stir evenly. Then put the mixture at a temperature of 80°C, let it stand for adsorption, dry and pulverize, then take 100ml of a hydroxymethyl cellulose solution with a concentration of 10g / L, mix and refine the mud, and extrude and granulate through a granulator to obtain a composite phase Change the precursor, mix it with 300g of phosphogypsum hemihydrate, and then ball mill it, add 300ml of water, 3g of gum arabic, 3.0g of boric acid, and 0.06g of citric acid, stir, pour into shape, dry and demould, and cure to obtain a gypsum-clay composite phase change energy storage material. The phase change temperature of the composite phase change energy storage material is 37.6°C, the phase change enthalpy is 12.34J / g, the flexural strength is 2.01MPa, ...

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Abstract

The invention discloses a preparation method of a gypsum and clay composite phase-change energy storing material. The composite phase-change energy storing material is characterized by being prepared from a composite phase-change precursor and a gypsum cementing material, wherein the composite phase-change precursor is prepared through the steps of adsorbing an organic phase-change agent by using an inorganic porous clay material through a solution intercalation method, then, binding by using a binder, granulating and drying; and then, the product is mixed with hemi-hydrated gypsum, and the mixture is molded to prepare the gypsum and clay composite phase-change energy storing material. The phase-change agent is selected from decanoic acid, lauric acid, myristic acid, palmitic acid, stearic acid, dodecanol, tridecanol, tetradecanol, pentadecanol, methyl palmitate, methyl heptadecanoate, ethyl heptadecanoate, methyl octadecanoate and paraffin. The inorganic porous clay material is selected from attapulgite, sepiolite, montmorillonite, bentonite, diatomite, zeolite, silica, dolomite, calcite and illite. The molding binder is selected from water glass, hydroxymethyl cellulose, silica sol and aluminum sol. The prepared composite phase-change energy storing material is wide in phase change temperature range, high phase-change latent heat, favorable in mechanical property and high in thermal stability.

Description

field of invention [0001] The invention relates to a preparation method of a gypsum-clay composite phase-change energy storage material, specifically disclosing a phase-change clay precursor obtained by using organic matter as a phase-change agent and porous inorganic clay material as a carrier through bonding and molding with a binder. A method for preparing a phase-change energy storage material by coagulating with the hemihydrate gypsum cementitious material to form and dry. Background of the invention [0002] The current economic and social development has a huge demand for energy and increasingly prominent environmental problems, which makes the phase change energy storage technology more and more attention at home and abroad. Phase change energy storage technology can improve the recycling rate of energy and is widely used in construction, aerospace, industry and other fields. [0003] A thermal storage material is a material that can store thermal energy. At a spec...

Claims

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Application Information

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IPC IPC(8): C09K5/06
Inventor 杨儒杨永峰李敏孙海明高杨
Owner BEIJING UNIV OF CHEM TECH
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