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A preparation method of modified attapulgite phase change energy storage material

A technology of phase change energy storage materials and attapulgite, which is applied in the field of preparation of phase change materials, can solve problems such as easy leakage of composite phase change materials, achieve improved stability, stable phase change enthalpy, and high phase change enthalpy Effect

Active Publication Date: 2020-06-02
SHENYANG RES INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although organic modification can increase the adsorption capacity of inorganic materials to organic phase change materials, it still has certain limitations, and composite phase change materials are prone to leakage during repeated use.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1, the preparation of modified attapulgite

[0021] Mix 20g of attapulgite and 200mL of water through an emulsifier to obtain a suspension to be treated, add hydrochloric acid solution dropwise, adjust pH=2-3, continue stirring for 1 hour, filter, and wash the filter cake repeatedly with deionized water until the filtrate p H=7, dry the filter cake at 120°C to obtain pretreated attapulgite; add the above pretreated attapulgite to 100mL ethanol to stir and disperse, then add 2g (0.009mol) silane coupling agent γ-aminopropyl base triethoxysilane, the suspension was heated to 70 °C and stirred for 5 hours, and the ethanol was distilled off to obtain 21 g of modified attapulgite.

Embodiment 2

[0022] Example 2, preparation of modified attapulgite phase change energy storage material

[0023] Add 100mL of toluene and 0.106g (0.004mol) of toluene diisocyanate to the reaction flask equipped with a nitrogen protection device, add dropwise 80g of polyethylene glycol monomethyl ether (8g, 0.004mol, molecular weight 2000) acetone solution, and stir at 50°C After 1 hour, add 6 g of the modified attapulgite prepared in Example 1, then add 0.1 μL of catalyst dibutyltin dilaurate (DBT), heat up to 80° C., react for 4 hours, evaporate acetone and toluene to dryness under reduced pressure, and vacuum at 60° C. After drying for 48 hours, 14 g of a novel organic-inorganic composite phase change energy storage material was obtained.

[0024] The composite phase change energy storage material obtained above was measured, and the tested phase change enthalpy value was 88KJ / mol. After 100 phase change cycles, the phase change enthalpy value is 88KJ / mol; after 200 phase change cycles,...

Embodiment 3

[0025] Example 3, preparation of modified attapulgite phase change energy storage material

[0026] Add 100mL of toluene and 0.106g (0.004mol) of toluene diisocyanate to the reaction flask equipped with a nitrogen protection device, add dropwise 200g of polyethylene glycol monomethyl ether (20g, 0.004mol, molecular weight 5000) acetone solution, and stir at 40°C After 1 h, add 6 g of the modified attapulgite prepared in Example 1, then add 0.1 μL of catalyst dibutyltin dilaurate (DBT), heat up to 85 ° C, react for 5 h, evaporate acetone and toluene to dryness under reduced pressure, and vacuum at 60 ° C After drying for 48 hours, 26 g of the novel organic-inorganic composite phase change energy storage material was obtained.

[0027] The composite phase change energy storage material obtained above was measured, and the tested phase change enthalpy value was 138.5KJ / mol. After 100 phase change cycles, the phase change enthalpy value is 138.5KJ / mol; after 200 phase change cycl...

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Abstract

The invention relates to the preparation of phase change materials, in particular to a preparation method of a modified attapulgite phase change energy storage material. The preparation method comprises the following steps: in the presence of nitrogen, mixing acetone solutions of methylbenzene, toluene diisocyanate and polyethylene glycol monomethyl ether, stirring for 1-2 hours at the temperatureof 40-50 DEG C, adding modified attapulgite, then adding a catalyst, increasing the temperature to 80-85 DEG C, reacting for 4-5 hours, performing reduced-pressure concentration and drying to obtainthe organic-inorganic composite phase change energy storage material. The preparation method provided by the invention has the benefits that through the reaction with a polymer phase change energy storage material by utilizing a polar silicon hydroxyl group richened on the natural attapulgite surface, the organic-inorganic composite phase change energy storage material bonded by chemical bonds isprepared, and further the problem that the organic-inorganic composite phase change material prepared with an adsorption method is prone to leakage is solved.

Description

technical field [0001] The invention relates to the preparation of phase change materials, in particular to a preparation method of modified attapulgite phase change energy storage materials. Background technique [0002] Phase change materials have approximately constant temperature in the process of absorbing and releasing energy, and have the advantages of high energy storage density, strong energy storage capacity, and small temperature change. Therefore, using phase change materials to store solar energy for reuse can solve the problem of solar radiation and solar energy. Take advantage of the mismatch between time and space. When phase change materials are actually used, it is necessary to solve the problem of leakage of phase change materials during the solid-liquid transition process. [0003] Organic / inorganic composite phase-change energy storage materials use the specific surface area and interface effect of inorganic substances to realize the shape-setting suppo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K5/06
CPCC09K5/063
Inventor 鄢冬茂闫士杰龚亚军
Owner SHENYANG RES INST OF CHEM IND