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A modified diatomite/adipic acid phase change heat storage material and its preparation method

A phase change heat storage, diatomite technology, applied in heat exchange materials, chemical instruments and methods, textiles and papermaking, etc. Conducive to the effect of rapid exchange, improved thermal conductivity and thermal stability, and simple process

Active Publication Date: 2021-10-22
HUANGGANG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, diatomite, as a common low-cost silicate material, can be used in the field of building energy conservation, such as stearic acid / modified diatomite composite phase change materials, capric acid (CA)-myristic acid (MA) and Diatomite composite phase change material, diatomite / fatty acid shape-setting phase change material, polyethylene glycol (PEG) / diatomite shape-setting composite phase change material, diatomite and paraffin-based composite phase-change material, gypsum-based paraffin / Diatomite phase-change energy storage materials, etc. Although the above studies are all diatomite-based phase-change heat storage materials, there are still some problems, such as low thermal conductivity affecting the rapid exchange of heat, and the complex preparation process leads to high costs, which limits its further industrial development
[0005] Therefore, there is a need for a composite material that can overcome the inherent low thermal conductivity of diatomite as an adsorption material, can solve the leakage problem during solid-liquid phase transition in the heat storage process, and can also improve the thermal conductivity of the overall composite system. Thermal stability, can effectively overcome the deficiencies of existing technologies

Method used

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  • A modified diatomite/adipic acid phase change heat storage material and its preparation method
  • A modified diatomite/adipic acid phase change heat storage material and its preparation method
  • A modified diatomite/adipic acid phase change heat storage material and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The preparation method of modified diatomite comprises the following steps:

[0040] (A1) Pour the dried diatomaceous earth into an aqueous NaOH solution with a concentration of 5wt.%, centrifuge after continuous stirring for 5 hours, weigh 50 g of the product after centrifugation, put it into a drying oven, and dry it at 105 ° C for 24 hours , to obtain diatomite powder;

[0041] (A2) configuration mass concentration is the mixed solution of 10%, wherein the solvent of mixed solution is N-N-dimethylformamide, and solute is polyvinylpyrrolidone and polymethylmethacrylate that mass ratio is 6:4, and step The diatomite powder obtained in (A1) was moved into the mixed solution, mechanically stirred for 12 hours, and the stirring temperature was 60°C. After stirring evenly, the centrifugal separation operation was performed, and the centrifugally separated product was dried in an oven at 80°C for 24 hours. ;

[0042] (A3) Put the product obtained in step (A2) into a muffl...

Embodiment 2

[0053] The preparation method of modified diatomite and the preparation method of bacterial cellulose fiber are the same as those described in Example 1.

[0054] The step (1) in the preparation method of the modified diatomite / adipic acid phase change thermal storage material is: weighing the modified diatomite, bacterial cellulose fiber and adipic acid according to the mass ratio, wherein the modified The mass ratio of diatomite to adipic acid is 38:62, the quality of the bacterial cellulose fiber is 2% of the total mass of modified diatomite and adipic acid, and the remaining steps are the same as those described in Example 1 same.

[0055] After testing, the modified diatomite / adipic acid phase change heat storage material prepared in this example has a melting endothermic enthalpy of 158.6 J / g and a solidification exothermic enthalpy of 156.4 J / g. The thermal conductivity of the material is 3.87W / (m.K) and the specific heat capacity is 1.07J / g as measured by the constant...

Embodiment 3

[0057] The preparation method of modified diatomite and the preparation method of bacterial cellulose fiber are the same as those described in Example 1.

[0058] The step (1) in the preparation method of the modified diatomite / adipic acid phase change thermal storage material is: weighing the modified diatomite, bacterial cellulose fiber and adipic acid according to the mass ratio, wherein the modified The mass ratio of diatomite to adipic acid is 35:65, and the quality of the bacterial cellulose fiber is 2% of the total mass of modified diatomite and adipic acid, and the remaining steps are the same as those described in Example 1. same.

[0059] After testing, the modified diatomite / adipic acid phase change heat storage material prepared in this example has a melting endothermic enthalpy of 167.8 J / g and a solidification exothermic enthalpy of 164.7 J / g. The thermal conductivity of the material is 3.63W / (m.K) and the specific heat capacity is 1.09J / g as measured by the con...

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PUM

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Abstract

The invention relates to a modified diatomite / adipic acid phase-change thermal storage material, the phase-change thermal storage material includes modified diatomite, bacterial cellulose fiber, and adipic acid, and the modified diatomite The mass ratio to adipic acid is 25-40:60-75, and the mass of the bacterial cellulose fiber is 1%-3% of the total mass of the modified diatomite and adipic acid. The present invention also relates to a preparation method of a modified diatomite / adipic acid phase change heat storage material, comprising the following steps (C1) weighing the modified diatomite, bacterial cellulose fiber and adipic acid according to the mass ratio ; (C2) Vacuum melting and adsorption after the above substances are mixed uniformly; (C3) Tablet molding. The phase-change heat storage material of the invention has excellent performance, simple preparation method and simple raw materials, can quickly synthesize a modified heat storage material with excellent performance and low cost without excessive modification of existing production equipment, and has low preparation cost.

Description

technical field [0001] The invention relates to a phase change heat storage material and a preparation method thereof, in particular to a modified diatomite / adipic acid phase change heat storage material for medium temperature and a preparation method thereof. Background technique [0002] With the continuous development of the global economy, human demand for fossil fuels continues to increase, which has caused a series of environmental problems, such as severe smog in some areas and a large amount of greenhouse gas emissions. These problems have seriously affected the development of social economy and the improvement of people's living standards. Therefore, vigorously promoting energy-saving and emission-reduction technologies and developing renewable clean energy are the inevitable ways to solve energy problems and the resulting environmental problems. In the use of various energy sources, thermal energy, as a common energy source, has disadvantages such as time disconti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K5/06D01F2/00
CPCC09K5/063D01F2/00
Inventor 李儒光程晓敏高亚凤王青萌田焜许杨施伟利
Owner HUANGGANG NORMAL UNIV