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Preparation method for composite phase-change energy accumulation material micro mist

An energy storage material and composite phase change technology, applied in the direction of heat exchange materials, chemical instruments and methods, etc., can solve problems affecting product quality, poor drying effect, long drying time, etc., to shorten the production cycle, ensure quality, The effect of increased contact area

Inactive Publication Date: 2010-12-08
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the use of polyvinyl alcohol as a stabilizer in this method, in the subsequent drying process, the microcapsules of the phase change material are easy to agglomerate, the drying effect is poor, and the product quality is affected, and the drying time is long and the efficiency is low.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Get 160ml phase-change paraffin, add 20 grams of sorbitan oleate 80 (Span80) and polyoxyethylene sorbitan monooleate 80 (Tween80) the mixed emulsifier that forms by mass ratio 0.4: 0.6, in heating 1. Under stirring conditions, add 1000mL aqueous solution containing 1.5wt% PVA to the above oil phase, then add 20mL 2.5mol / L sodium chloride solution, continue heating and stirring, after emulsification for 30min, add 5mL 10wt% acetic acid, 160mL Tetraethyl orthosilicate, placed in a water bath at 60°C and stirred for 3 hours, aged for 12 hours, added 1000ml of distilled water, stirred evenly to make a slurry, set the inlet temperature of the spray drying equipment to 180°C, and the outlet temperature to 70°C , after the equipment reaches the set value, set the peristaltic pump speed to 14rpm to feed the material, adjust the air pressure of the two-fluid atomizer to 5MPa, and spray and dry the composite phase change energy storage material powder, the phase change enthalpy is...

Embodiment 2

[0016] Get 160ml phase-change paraffin, add 20 grams of sorbitan oleate 80 (Span80) and polyoxyethylene sorbitan monooleate 80 (Tween80) the mixed emulsifier that forms by mass ratio 0.4: 0.6, in heating , under stirring conditions, add 1000mL aqueous solution containing 1.5wt% PVA to the above oil phase, then add 20mL 2.5mol / L sodium chloride solution, continue heating and stirring, after emulsification for 30min, add 5mL10wt% acetic acid, 160mL of Ethyl orthosilicate, placed in a water bath at 60°C and stirred for 3 hours, aged for 12 hours, washed by centrifugation, filtered, and then added to the filter cake with 1500 mL of an aqueous solution containing 0.5wt-% PVA and stirred evenly to form a slurry Material; set the inlet temperature of the spray drying equipment to 190°C, and the outlet temperature to 70°C. After the equipment reaches the set value, set the peristaltic pump speed to 10rpm to feed the material, and adjust the air pressure of the two-fluid atomizer to 5Mp...

Embodiment 3

[0018] Get 160ml of phase-change paraffin, add 20 grams of sorbitan oleate 80 (Span 80) and polyoxyethylene sorbitan monooleate 80 (Tween 80) by mass ratio 0.45: 0.55 mixed emulsifier composition, Under the condition of heating and stirring, add 1000mL aqueous solution containing 1.5wt-% PVA to the above oil phase, then add 20mL 2.5mol / L sodium chloride solution, continue heating and stirring, after emulsifying for 30min, add 5mL 10wt- % acetic acid, 160mL of tetraethyl orthosilicate, placed in a water bath at 60°C and stirred for 2.5h, aged for 12h, added 1000mL of distilled water, stirred evenly to make a slurry, set the inlet temperature of the spray drying equipment to 200°C, The outlet temperature is 80°C. After the equipment reaches the set value, the peristaltic pump speed is set to 10rpm to feed the material, and the air pressure of the two-fluid atomizer is adjusted to 3MPa. The composite phase change energy storage material micropowder obtained by spray drying, its T...

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PUM

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Abstract

The invention provides a method for preparing composite phase transformation energy storage material miropowder. In the preparation method, an organic phase transformation material, sorbitan oleate 80 and polyoxyethylene sorbitan monooleate 80 are mixed; the mixture is added to water solution containing polyvinyl alcohol, and an additive in alkali metal salt series is added; the mixture is stirred at 40 to 95 DEG C so that the phase transformation material is uniformly dispersed to form emulsion; ethyl orthosilicate and an acidic catalyzer are added to the emulsion; the mixture of the emulsion, the ethyl orthosilicate and the catalyzer react for 3 to 12 hours in a water bath and are aged at room temperature, thus manufacturing paste containing 3 to 30 percent of solid by weight; the pasteis added to a spray drying tower through a peristaltic pump rotating at 0 to 70rpm, and is sprayed and dried with the inlet temperature from 160 to 240 DEG C and the outlet temperature from 50 to 100DEG C. As the spray-dry method is adopted, the problem that the phase transformation energy storage material microcapsule miropowder is dispersed difficultly during the subsequent drying process is successfully solved; the product quality is ensured; the production cycle is shortened; and the production efficiency is improved.

Description

technical field [0001] The invention belongs to a preparation method of a phase-change energy storage material, and in particular relates to a preparation method of a composite phase-change energy storage material micropowder with inorganic matter as a carrier. Background technique [0002] Utilizing the characteristics of substances absorbing energy and releasing energy during the phase transition process to realize energy storage and utilization has attracted much attention in many fields such as energy, materials, aerospace, textiles, electric power, medical instruments, and construction. Since the volume change of solid-liquid phase transition is small and the heat of phase transition is large, the application of solid-liquid phase transition for phase change energy storage has become a research hotspot in the field of phase change energy storage in recent years. However, solid-liquid phase change materials generate liquid during the energy storage process, which is pron...

Claims

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Application Information

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IPC IPC(8): C09K5/06
Inventor 唐国翌缪春燕万军喜姚有为翁端
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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