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Composite phase-change heat-storing material using gel as carrier and method for making same

A technology of composite phase change and heat storage materials, which is applied in the field of phase change energy storage materials, can solve problems such as leakage, large volume change, and difficulty in packing, and achieve the effects of increased stability, simple preparation process, and low cost

Inactive Publication Date: 2008-02-06
CENT SOUTH UNIV
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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 provide a composite material that can effectively prevent the liquid leakage of the phase change heat storage material in view of the shortcomings of the existing solid-liquid phase change heat storage material that changes from solid to liquid during the phase change process, which has a large volume change and is difficult to contain. Phase change heat storage material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Take 1 g of N-isopropylacrylamide, 0.1 g of N,N-methylenebisacryloyl, and 0.06 g of benzoyl peroxide, and dissolve them in 7 ml of 1,4-dioxane. After the dissolution is complete, add 2.1 g of palmitic acid and 1.4 g of lauric acid, and stir in a 30° C. water bath until completely dissolved. Then put it in a water bath at 70° C. under the protection of nitrogen for 2 hours. After the reaction is complete, take out the synthesized sample, put it in a vacuum drying oven to dry for a week, control the temperature at 50-60°C, and take it out when the sample has a constant weight, which is the phase change material.

[0018] The material is a light yellow solid at room temperature, is thermoplastic, and can still maintain sufficient strength and toughness after phase transition. The phase transition temperature is 52°C, the phase transition enthalpy is 105 J / g, and the weight loss rate of the material at 150°C is 1.03%.

Embodiment 2

[0020] Take 0.95g of N-isopropylacrylamide, 0.5g of acrylamide, 0.1g of N,N-methylenebisacryloyl, and 0.06g of benzoyl peroxide, and dissolve them in 7ml of 1,4-dioxane . After the dissolution is complete, add 2.1 g of palmitic acid and 1.4 g of lauric acid, and stir in a 30° C. water bath until completely dissolved. Then put it in a water bath at 70°C to react. After 1 hour of reaction, the solution starts to react and gel at the bottom, and when the upper part is still a transparent liquid, add 1 g of disodium hydrogen phosphate dodecahydrate, stir in a magnetic water bath for 30 minutes, and stop stirring when the whole reactant is mixed evenly , continue to react for 1 hour.

[0021] After the reaction is complete, put it in a vacuum drying oven to dry for one week, control the temperature at 50-60° C., then put it in a 30° C. vacuum drying oven and dry it for a week, and take out the phase change material.

[0022] The material is a white hard solid at room temperature...

Embodiment 3

[0024] Take 1 g of N-isopropylacrylamide, 0.1 g of N,N-methylenebisacryloyl, and 0.06 g of benzoyl peroxide, and dissolve them in 7 ml of 1,4-dioxane. After the dissolution is complete, add 1.2 g of palmitic acid and 0.8 g of lauric acid, and stir in a water bath at 30° C. until completely dissolved. Then put it in a water bath at 70° C. for 2 hours. After the reaction is complete, the synthesized sample is taken out and dried in a vacuum drying oven for one week, the temperature is controlled at 50-60°C, and the sample is taken out when the mass of the sample is constant.

[0025] The material is thermal, and there is no leakage before and after the phase transition. The phase transition temperature is 37°C, the phase transition enthalpy is 88J / g, and the weight loss rate of the material is 1.43% at 150°C.

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Abstract

The present invention provides composite phase transition heat accumulation material used gel as carrier, and the preparation method and the application of the material. The material of the present invention is formed by compositing the phase transition heat accumulation material accounted for 60 percent to 80 percent of the total mass into a macromolecule gel carrier accounted for 20 percent to 40 percent of the total mass, the material has thermo-plasticity and better thermo stability, compared with the same kind of macromolecule heat accumulation material, the material has higher phase transition enthalpy. The material can be used in temperature control and energy saving for buildings, and can also be used in heat preservation and energy saving fields for daily articles, thereby the present invention has wide application prospect.

Description

technical field [0001] The invention relates to the field of phase change energy storage materials, in particular to a composite phase change heat storage material with polymer gel as a carrier. Background technique [0002] Phase change materials are currently widely used energy storage materials, and with the coming of the energy crisis, their applications in real life will be more extensive. According to the different phase change methods, phase change materials can be divided into solid-liquid phase change materials and solid-solid phase change materials. The solid-liquid phase change material is the most commonly used at home and abroad at present. Because it has a liquid phase during the phase change process, it must be packaged in a container before use, otherwise there will be a risk of liquid phase leakage and environmental pollution. At the same time, solid-liquid phase change materials generally have disadvantages such as supercooling, phase separation, energy st...

Claims

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Application Information

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IPC IPC(8): C09K5/02C08L33/26C08L33/04C08K3/32C08K5/09
Inventor 潘春跃于典
Owner CENT SOUTH UNIV
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