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Preparation method of porous matrix composite phase change materials for recycling wide-temperature range afterheat

A composite phase change material and waste heat recovery technology, which is applied in the field of preparation of porous matrix composite phase change materials, can solve problems such as leakage of phase change core materials, and achieve the effects of preventing leakage, saving costs, and mild reaction conditions

Inactive Publication Date: 2015-03-25
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to effectively solve the problems of leakage of the phase change core material and reduce the corrosion effect of the phase change core material on the container by providing a method for preparing a porous matrix composite phase change material for waste heat recovery in a wide temperature range, so as to realize Recycling and utilization of waste heat and waste energy in a wide temperature range generated in the actual industrial production process
The present invention proposes a method for preparing a composite phase change material suitable for waste heat recovery in a wide temperature range, which overcomes the shortcomings in the current production and application process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0029] γ-Al 2 o 3 Before use, pre-soak ultrasound in absolute ethanol for 4 h, and then dry in a constant temperature drying oven at 60-80 °C for 1-2 days. Add 0.5 g of PEG2000 into 30 ml of absolute ethanol and stir in an oil bath at 80 °C for 2 h to dissolve completely, obtaining a uniform and single solution. Add the homogeneous solution obtained above to the pretreated γ-Al 2 o 3 in the oil bath at 80 °C for 4 h, and then dried in a blast dryer at 80 °C for 48 h. Get PEG2000 / γ-Al 2 o 3 composite phase change materials.

Embodiment example 2

[0031] γ-Al 2 o 3 Before use, pre-soak ultrasound in absolute ethanol for 4 h, and then dry in a constant temperature drying oven at 60-80 °C for 1-2 days. Add 2.5 g of sodium chloride and 5 g of lithium nitrate into 30 ml of deionized water, stir in an oil bath at 80 °C for 3 h to dissolve completely, and obtain a uniform and single solution. Add the homogeneous solution obtained above to the pretreated γ-Al 2 o 3 in the oil bath at 80 °C for 6 h, and then dried in a blast dryer at 80 °C for 36 h. Get NaCl / NaNO 3 γ-Al 2 o 3 Composite phase change materials.

Embodiment example 3

[0033]Prepare 150 mL of sodium nitrate solution, where the concentration of sodium nitrate solution is 0.1 mol / L, put it in an oil bath at 80 °C, and slowly add 0.1 mol / L zinc nitrate and 0.2 mol / L aluminum nitrate solution under nitrogen atmosphere , adjust the concentration of the reaction system to neutral with NaOH solution, react for 10 h, filter the obtained product, wash with water, and dry under vacuum at 40 °C for 24 h. Weigh 2 g of the obtained product, add it into an ethanol solution dissolved with 0.5 g of trimethylchlorosilane, and react at 60 °C for 12 h to obtain a modified Zn-Al hydrotalcite.

[0034] Add 0.5 g of PEG6000 and 2 g of magnesium chloride hexahydrate into a mixture of 30 ml of absolute ethanol and 50 mL of deionized water, stir in an oil bath at 80 °C for 2 h to dissolve completely, and obtain a uniform and single solution. The homogeneous solution obtained above was added to the pretreated montmorillonite, kept in an oil bath at 60 °C for 10 h, an...

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Abstract

The invention belongs to the technical field of preparation of composite phase change materials, and particularly relates to a preparation method of porous matrix composite phase change materials for recycling wide-temperature range afterheat. The preparation method comprises the following steps: selecting porous materials (gamma-Al2O3, kaolin, laminated hydrotalcite, montmorillonoid and the like), which are good in heat stability, large in specific surface area, and easy to organically modify as matrix materials; and selecting different types of inorganic salts and multiple organic phase change materials as phase change core materials, and preparing a series of novel porous matrix composite phase change materials through a dispersion dipping method. The method has the advantages that 1) a simple and convenient method is developed to obtain a series of porous matrix composite phase change materials of which the phase change temperature changes in an echelon manner; 2) the prepared porous matrix composite phase change materials are capable of effectively immobilizing a phase change core material, the problems of leakage, corrosion and the like can be prevented, and the cost for secondary packaging is reduced; and 3) the method provided by the invention is simple in process, mild in reaction condition and suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the field of composite phase-change materials, and in particular relates to a method for preparing a porous matrix composite phase-change material used for recovery of waste heat in a wide temperature range. Background technique [0002] Today, when the energy crisis and environmental pollution are sweeping the world, it is extremely urgent to research and develop new energy and renewable energy, and to develop efficient energy-saving technologies. At present, wind energy, solar energy, and ocean energy have been widely used in related fields such as electric power and heating. However, there are problems such as intermittency, randomness, and volatility in the distribution of the above energy sources, which bring great difficulties to its utilization. Phase change heat storage / energy storage technology can effectively solve the contradiction between thermal energy supply and demand in terms of time and intensity mismatch, avo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
CPCC09K5/063Y02P20/10Y02P20/141
Inventor 王戈齐悦栾奕杨穆马倩倩王静静范爽侯俊英
Owner UNIV OF SCI & TECH BEIJING
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