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Preparation method of composite mineral microsphere-based phase change heat storage material

A phase change heat storage material and composite mineral technology, which is applied in the field of preparation of composite mineral microsphere-based phase change heat storage materials, can solve the problems of low heat storage capacity, roughness, easy leakage of phase change materials, etc., so as to improve heat storage. performance, improved dispersion performance, significant heat storage effect

Active Publication Date: 2021-11-12
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems that existing phase change materials are easy to leak, have low heat storage capacity, and the degree of dissociation and dispersion of attapulgite rod crystal bundles restricts the high-value utilization of attapulgite clay resources, the purpose of the present invention is to provide a composite mineral micro The preparation method of spherical-based phase-change heat storage materials is to prepare composite mineral microspheres with hollow porous spherical three-dimensional structure by introducing cellulose nanocrystals, spray drying and calcination. Its structure and rough surface are phase The more abundant adsorption sites are provided by the change material, thus improving the heat storage performance of the phase change heat storage material

Method used

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  • Preparation method of composite mineral microsphere-based phase change heat storage material
  • Preparation method of composite mineral microsphere-based phase change heat storage material
  • Preparation method of composite mineral microsphere-based phase change heat storage material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] (1) Put 100 g of embossed stone ore (ATP) in a beaker for 30 min, ultrasonic 30min, stand for a period of time, remove the precipitated impurities, filter, dry, ground, and sieve it to obtain a water washing Fallen stone. Those 30 g of the water washed and placed in a beaker with a 300 ml mass fraction of 4 wt.% Hydrochloric acid solution, a beaker was placed in a constant temperature water bath, stirred, ultrasound, and washing for 60 min. The acid activated groove stone was obtained by purge filtration method.

[0049] (2) Take 3 g of cellulose nanocrystals in 150 ml of deionized water, add 0.75 g sodium sodium phosphate, stirred for 30 min, and the ultrasonic crusher is treated for 30 min to obtain cellulose nanocrystalline solution.

[0050] (3) Take the acid activated section 9 g of 450 ml of deionized water, and 2.25 g of sodium sodium phosphate is added, stirred for 30 min, and the ultrasonic crusher is treated for 30 min to obtain a concave-resistant stone suspensio...

Embodiment 2

[0054] (1) Preparation method of composite mineral microspheres is in Example 1.

[0055] (2) Weigh 4G composite mineral microspheres and 6 g of stearic acid (SA) to add the filtration bottle, vacuum 20min at room temperature, then vacuum 40min under 90 ° C water, 60 ° C oven heat filtration 12h, Stearic acid - composite mineral microspheres - ATP-CNCs.

Embodiment 3

[0057] (1) Preparation method of composite mineral microspheres is in Example 1.

[0058] (2) Weigh 4 g of composite mineral microspheres and 6 g of Polyethylene glycol 600 (PEG600), in the filtration bottle, vacuuming for 20 min at room temperature, then vacuuming at 90 ° C for 40 min, 60 ° C oven heat filtration 12h, The polyethylene glycol 600-composite mineral microspheres (PEG600-ATP-CNCs) were obtained.

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Abstract

The invention discloses a preparation method of a composite mineral microsphere-based phase change heat storage material. The preparation method comprises the steps of (1) carrying out acid activation on attapulgite to obtain acid-activated attapulgite; (2) mixing the acid-activated attapulgite with sodium hexametaphosphate and water to obtain an attapulgite suspension; mixing cellulose nanocrystals with sodium hexametaphosphate and water to obtain a cellulose nanocrystal solution, mixing the attapulgite suspension with a cellulose nanocrystal solution, and performing spray drying to obtain attapulgite / cellulose nanocrystal composite microspheres; (3) calcining to obtain composite mineral microspheres; and (4) carrying out vacuum impregnation on the composite mineral microspheres and a phase change material to obtain the composite mineral microsphere-based phase change heat storage material. According to the invention, the cellulose nanocrystals are introduced, spray drying and calcination are adopted to prepare the composite mineral microspheres with the hollow porous sphere-like three-dimensional structure, and the structure and the rough surface of the composite mineral microspheres provide richer adsorption sites for the phase change material, so that the heat storage performance of the phase change heat storage material is improved.

Description

Technical field [0001] The present invention belongs to the technical field of phase change storage material, and more particularly to a method of preparing a composite mineral microsphere-based phase change heat storage material. Background technique [0002] With the rapid development of the world industry and economy, countries have increased the demand for energy, and energy shortage and environmental pollution have become increasingly prominent. Energy saving and emission reduction, increasing energy utilization is an effective way to alleviate the above problems. Heat energy has always been an indispensable energy in human society. Most renewable or non-renewable energy, such as fossil fuel, electric power, solar and nuclear energy, generally directly or indirectly by thermal energy. At the same time, a large amount of waste heat is generated during the energy consumption process, which greatly reduces energy utilization efficiency, increasing the possibility of heat safety...

Claims

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Application Information

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IPC IPC(8): C09K5/06
CPCC09K5/063Y02E70/30
Inventor 杨华明李道奎唐异立左小超赵晓光
Owner CENT SOUTH UNIV
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