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Light and heat storage type composite phase change material for energy storage and preparation method of light and heat storage type composite phase change material

A composite phase change material and energy storage technology, which is applied in the field of light storage and heat storage type composite phase change materials and their preparation, and can solve the problems of limiting the application of solid-liquid phase change materials, single energy storage and release form, and poor shape stability. , to achieve the effect of excellent light storage, strong operability and low leakage rate

Inactive Publication Date: 2021-07-20
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the solid-liquid phase change material has the advantages of large phase change latent heat, wide phase change temperature range, and easy control, but there are some obvious defects in the actual application process of the solid-liquid phase change material, such as low thermal conductivity and uneven heating. , easy to melt and leak, poor shape stability, single form of energy storage and release, can only store and release heat energy, etc.
These shortcomings greatly limit the application of solid-liquid phase change materials

Method used

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  • Light and heat storage type composite phase change material for energy storage and preparation method of light and heat storage type composite phase change material
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  • Light and heat storage type composite phase change material for energy storage and preparation method of light and heat storage type composite phase change material

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preparation example Construction

[0034] Please refer to figure 1 , an embodiment of the present invention provides a method for preparing a light-storage and heat-storage composite phase change material for energy storage, comprising the following steps:

[0035] Step S1, adding polyvinyl alcohol into deionized water, stirring and dissolving at 85-100° C. for 1.5-3 hours to obtain a polyvinyl alcohol solution with a concentration of 10-30 mg / mL;

[0036] Step S2, mixing the crosslinking agent and the thermally conductive filler, and ultrasonically agitating at 20-40° C. for 10-30 minutes to obtain the first mixed solution; wherein, the mass ratio of thermally conductive filler: crosslinking agent: polyvinyl alcohol is: (0-10 ): 1: (3-8); the crosslinking agent is selected from paraformaldehyde, glutaraldehyde, boric acid, borate, maleic anhydride, phthaloyl chloride, phthalic anhydride, succinic anhydride, phthalic acid, Any one of epichlorohydrin or copper hydroxide, the concentration of the crosslinking ag...

Embodiment 1

[0044] Embodiment 1 of the present invention provides a method for preparing a light-storage and heat-storage composite phase change material for energy storage, comprising the following steps:

[0045] Step S1, adding 0.6 g of polyvinyl alcohol into 30 mL of deionized water, stirring and dissolving at 95° C. for 2 hours until the polyvinyl alcohol is completely dissolved to obtain a polyvinyl alcohol solution;

[0046] Step S2, mixing and dissolving 0.12 g of boric acid and 0.3 g of boron nitride (BN) into 30 mL of deionized water, and ultrasonically stirring at 30° C. for 15 min to obtain a mixed solution of boric acid and boron nitride;

[0047] Step S3, adding the mixed solution prepared in S2 to the polyvinyl alcohol solution prepared in S1, stirring continuously at 95°C for 20 minutes until the solution is evenly dispersed;

[0048] Step S4, pre-freezing the mixed solution prepared in S3 for 12 hours in a refrigerator, and then freeze-drying for 72 hours at -52°C and a v...

Embodiment 2

[0064] Embodiment 2 of the present invention provides a method for preparing a light-storage and heat-storage composite phase change material for energy storage, comprising the following steps:

[0065] Step S1, adding 0.6 g of polyvinyl alcohol into 30 mL of deionized water, stirring and dissolving at 95° C. for 2 hours until the polyvinyl alcohol is completely dissolved to obtain a polyvinyl alcohol solution;

[0066] Step S2, mixing and dissolving 0.15 g of boric acid and 0.15 g of silicon carbide into 30 mL of deionized water, and ultrasonically stirring at 25° C. for 30 min to obtain a mixed solution of boric acid and silicon carbide;

[0067] Step S3, mixing the mixed solution prepared in S2 with the polyvinyl alcohol solution prepared in S1, and stirring continuously at 85° C. for 30 minutes until the solution is uniformly dispersed;

[0068] Step S4, pre-freezing the mixed solution prepared in S3 in liquid nitrogen for 30 minutes, and then freeze-drying for 48 hours un...

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Abstract

The invention provides a preparation method of a light and heat storage type composite phase change material for energy storage, which comprises the following steps: adding polyvinyl alcohol into deionized water, stirring and dissolving to obtain a polyvinyl alcohol solution; mixing the cross-linking agent and the heat-conducting filler, and performing ultrasonic stirring to obtain a first mixed solution; mixing the first mixed solution with a polyvinyl alcohol solution, and stirring the mixture until the mixture is uniformly dispersed to obtain a second mixed solution; pre-freezing the second mixed solution to a solid state, and then freeze-drying the mixture to obtain polyvinyl alcohol-based composite aerogel; mixing the phase change material and the light storage particles to obtain a phase change core material; and immersing the polyvinyl alcohol-based composite aerogel into the phase change core material in vacuum, and cooling the composite aerogel to room temperature to obtain the light and heat storage type composite phase change material. The composite phase change material provided by the invention has the characteristics of high phase change enthalpy, high thermal conductivity, low leakage rate and excellent light storage and heat storage performance.

Description

technical field [0001] The invention relates to the technical field of energy storage, in particular to a light-storage and heat-storage composite phase change material for energy storage and a preparation method thereof. Background technique [0002] Energy is an essential factor for the survival and development of human beings, but the utilization efficiency of human beings cannot reach 100%, and most of the unused energy will be lost in the form of light and heat, causing huge waste. In the next few decades, fossil energy may still be the main energy source for human beings. Considering the non-renewability of fossil energy and its serious consequences on the earth's environment, it is necessary to optimize and improve energy utilization efficiency for the recovery and reuse of lost energy . [0003] Phase change materials complete the absorption and release of heat during the phase transition process, and can effectively complete waste heat recovery, so they are ideal e...

Claims

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Application Information

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IPC IPC(8): C09K5/06
CPCC09K5/063
Inventor 周克清鲁江涛谢登登
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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