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A kind of solar heat storage material with kaolin as supporting matrix and its preparation method

A heat storage material and support matrix technology, applied in the field of solar heat storage materials and preparation, can solve the problems of performance degradation, weakening of the bonding force between support matrix and phase change materials, etc., achieve good thermal cycle performance, and be suitable for large-scale industrial production , Expand the effect of the application field

Active Publication Date: 2017-01-18
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing method of preparing mineral-based heat storage materials is to organically modify the minerals first, and then compound organic phase change materials. The advantage is that the amount of phase change materials loaded on the supporting matrix will increase, but after multiple thermal cycles , the interaction between the organic modifier and the organic phase change material leads to the weakening of the bonding force between the support matrix and the phase change material, thereby reducing the performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 150g of hydrochloric acid with a mass concentration of 8% was added to 100g of flaky kaolin, stirred and mixed, placed in a microwave oven, and microwaved at a power of 700W for 5min. Wash with deionized water and filter several times until AgNO 3 Solution detection Cl-free - exist. Put the sample after microwave acid treatment in an oven to dry at 105°C for later use; weigh 6.0g of paraffin and 4.0g of kaolin and pour them into a conical flask equipped with a vacuum system, turn on the vacuum device, and evacuate to -0.1 MPa is maintained for 10 minutes. Then place the Erlenmeyer flask in a constant temperature water bath at 85°C for 20 min. Afterwards, the vacuum was stopped, the air was returned to the Erlenmeyer flask, and it was placed in a water bath at 80°C for 5 minutes of sonication. After cooling, the sample was taken out, placed in an oven at 80°C, and filtered for 5 hours to obtain a sheet-like solar heat storage material.

[0025] The performance param...

Embodiment 2

[0029] 150g of hydrochloric acid with a mass concentration of 8% was added to 100g of layered kaolin, stirred and mixed, placed in a microwave oven, and microwaved at a power of 700W for 5min. Wash with deionized water and filter several times until AgNO 3 Solution detection Cl-free - exist. Put the sample after microwave acid treatment in an oven to dry at 105°C for later use; weigh 6.0g of paraffin and 4.0g of kaolin and pour them into a conical flask equipped with a vacuum system, turn on the vacuum device, and evacuate to -0.1 MPa is maintained for 10 minutes. Then place the Erlenmeyer flask in a constant temperature water bath at 95°C for 20 min. Afterwards, the vacuum was stopped, the air was returned to the Erlenmeyer flask, and it was placed in a 75°C water bath for 5 minutes of sonication. After cooling, the sample was taken out, placed in an oven at 85°C, and filtered for 5 hours, and finally a layered solar heat storage material was obtained.

[0030] The perfo...

Embodiment 3

[0034] 150g of hydrochloric acid with a mass concentration of 8% was added to 100g of rod-shaped kaolin, stirred and mixed, placed in a microwave oven, and microwaved at a power of 700W for 5min. Wash with deionized water and filter several times until AgNO 3 Solution detection Cl-free - exist. Put the sample after microwave acid treatment in an oven to dry at 105°C for later use; weigh 6.0g of paraffin and 4.0g of kaolin and pour them into a conical flask equipped with a vacuum system, turn on the vacuum device, and evacuate to -0.1 MPa is maintained for 10 minutes. Then place the Erlenmeyer flask in a constant temperature water bath at 90°C for 20 min. Afterwards, the vacuum was stopped, the air was returned to the Erlenmeyer flask, and it was placed in a water bath at 85° C. for 5 min for sonication. After cooling, the sample was taken out, placed in an oven at 90°C, and filtered for 5 hours to obtain a rod-shaped solar heat storage material.

[0035]The performance pa...

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Abstract

The invention discloses a solar heat storage material taking kaolin as a supporting basal body and a preparation method of the solar heat storage material. Kaolin which is different in microstructure and paraffin are taken as materials, surface of the kaolin is activated by virtue of microwave acid treatment, and further is compounded with the paraffin to obtain the heat storage material. Heat storage capacity of the material is 84J.g<-1>-107J.g<-1>, and a heat conductivity coefficient of the material is adjustable in a range of 0.65 W.m<-1>.K<-1> to 0.78 W.m<-1>.K<-1>. The solar heat storage material disclosed by the invention is reasonable in proportion, simple in processing process, and capable of effectively improving binding force between a phase-change material and a supporting basal body; with effective broadening heat storage performance, the prepared heat storage material has excellent thermal circulation performance, satisfies requirements of recycling and applying in more fields, and expands application field of the kaolin-base heat storage material; kaolin in different structures which is formed by utilizing mineralizing condition difference of minerals is utilized, so that the prepared solar heat storage material is adjustable in heat storage capacity and heat conductivity coefficient, and suitable for large-scale industrial production.

Description

technical field [0001] The invention discloses a solar heat storage material and a preparation method; in particular, it refers to a solar heat storage material with kaolin as a supporting matrix and a preparation method; it belongs to the technical field of heat storage material preparation. Background technique [0002] As a renewable energy source, solar energy has attracted widespread attention from all over the world for its efficient utilization. Realizing the sustainable utilization of solar energy is the key to efficient utilization of solar energy. Solar energy utilization is divided into photovoltaic and photothermal. Due to environmental problems such as high energy consumption and heavy pollution in the photovoltaic front-end industry, the industry has suffered from cold weather. Therefore, the environmental protection advantages of solar thermal have begun to appear, and it has been widely used in household water heaters, building energy conservation, thermal p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K5/06
Inventor 杨华明
Owner CENT SOUTH UNIV
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