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Phase change heat storage particles with composite shell layers and preparation method thereof

A phase-change heat storage and particle technology, applied in chemical instruments and methods, heat exchange materials, etc., can solve the problems of microcapsule adhesion, difficult to meet the requirements of dispersibility and industrial applications, and achieve high service temperature and thermal shock. The effect of good stability and simple preparation process

Active Publication Date: 2019-04-16
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the preparation method of this kind of microcapsules is simple, the prepared microcapsules are bonded, so it is difficult to meet the industrial application with high requirements for dispersion.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A phase-change thermal storage particle with a composite shell and a preparation method thereof. The steps of the preparation method described in this embodiment are:

[0028] Step 1. Alternately washing the aluminum-silicon alloy powder with acid and deionized water for 1-5 times, then placing it in a protective atmosphere, and drying at 60-120° C. for 3-7 hours to obtain surface-modified aluminum-silicon alloy powder.

[0029] Step 2, placing the surface-modified aluminum-silicon alloy powder in water vapor for 20-130 minutes to prepare pretreated aluminum-silicon alloy powder.

[0030] The temperature of the water vapor is 100-200° C., and the gauge pressure of the water vapor is 0.01-0.4 MPa.

[0031] Step 3. Place the pretreated aluminum-silicon alloy powder in alkaline silica sol, and place the 5 Place it under the condition of Pa for 2-5 minutes to prepare a mixed slurry.

[0032] Step 4: Filter the mixed slurry, and dry the filtered filter residue at 60-120° ...

Embodiment 2

[0037] A phase-change thermal storage particle with a composite shell and a preparation method thereof. The steps of the preparation method described in this embodiment are:

[0038] Step 1. Alternately washing the aluminum-silicon alloy powder with alkali and deionized water for 3-8 times, then placing it in a protective atmosphere, and drying at 100-160° C. for 6-10 hours to obtain surface-modified aluminum-silicon alloy powder.

[0039] Step 2, placing the surface-modified aluminum-silicon alloy powder in water vapor for 110-220 minutes to prepare pretreated aluminum-silicon alloy powder.

[0040] The temperature of the water vapor is 180-280° C., and the gauge pressure of the water vapor is 0.3-0.7 MPa.

[0041] Step 3. Place the pretreated aluminum-silicon alloy powder in alkaline silica sol, and place it in a vacuum of 0.4-0.7×10 5 Place it under the condition of Pa for 4-7 minutes to prepare a mixed slurry.

[0042] Step 4: Filter the mixed slurry, and dry the filter...

Embodiment 3

[0047] A phase-change thermal storage particle with a composite shell and a preparation method thereof. The steps of the preparation method described in this embodiment are:

[0048] Step 1. Alternately washing the aluminum-silicon alloy powder with alkali and deionized water for 6-10 times, then placing it in a protective atmosphere, and drying at 140-200° C. for 9-12 hours to obtain surface-modified aluminum-silicon alloy powder.

[0049] Step 2, placing the surface-modified aluminum-silicon alloy powder in water vapor for 200-300 minutes to prepare pretreated aluminum-silicon alloy powder.

[0050] The temperature of the water vapor is 260-350° C., and the gauge pressure of the water vapor is 0.6-0.9 MPa.

[0051] Step 3. Place the pretreated aluminum-silicon alloy powder in alkaline silica sol, and place the 5 Place it under the condition of Pa for 7-10 minutes to prepare the mixed slurry.

[0052] Step 4: Filter the mixed slurry, and dry the filtered filter residue at ...

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Abstract

The invention relates to phase change heat storage particles with composite shell layers and a preparation method thereof. According to the technical scheme, aluminum-silicon alloy powder is alternately washed with acid or alkali and deionized water, and the aluminum-silicon alloy powder is dried in the protective atmosphere at the temperature of 60-200 DEG C; the aluminum-silicon alloy powder issubjected to standing in vapor at the temperature of 100-350 DEG C and the gauge pressure of 0.01-0.9 MPa, the aluminum-silicon alloy powder is put under the condition that the vacuum degree is 0.1-1KPa for 2-10 min, the aluminum-silicon alloy powder is filtered, and filter residues are dried; then the material is kept under the air or oxidizing atmosphere condition at the temperature of 800-1,500 DEG C for 3-8 h, the material is cooled to room temperature, and the phase change heat storage particles with the composite shell layers are prepared. The process is simple, the cost is low, and industrial production is easy; by means of the prepared phase change heat storage particles with the composite shell layers, the utilization rate of heat can be increased, the utilization efficiency of the heat can be improved, the use temperature is high, and the service life is long; the requirements of heat storage use in the energy saving field are met.

Description

technical field [0001] The invention belongs to the technical field of phase change thermal storage particles. It specifically relates to providing a phase-change heat storage particle with a composite shell and a preparation method thereof. Background technique [0002] The phase change heat storage particles are composed of phase change material as core and coating material as shell. Due to the advantages of non-corrosion, anti-medium leakage, high heat storage density and constant temperature during phase change, phase change heat storage particles have become a research hotspot in recent years. [0003] Phase change materials are classified by phase change temperature, and phase change materials with a phase change temperature above 500°C are called high temperature phase change materials. Aluminum and aluminum-silicon alloys are one of the high-temperature phase change heat storage materials, which have the advantages of good thermal conductivity, good thermal stabili...

Claims

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Application Information

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IPC IPC(8): C09K5/06
CPCC09K5/063
Inventor 张美杰韩藏娟顾华志白晨黄奥陈尧
Owner WUHAN UNIV OF SCI & TECH