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A kind of composite phase change material with pva as skeleton material and preparation method thereof

A composite phase change material and phase change material technology, which is applied in the field of composite phase change materials, can solve problems such as less research, and achieve the effects of not being easily damaged, good leakage prevention performance, and good mechanical properties

Active Publication Date: 2020-07-31
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, three-dimensional aerogels have been extensively studied in the preparation of high-performance CPCMs; although a series of new CPCMs have been prepared with nanomaterial-assembled aerogels, the preparation of composite phase change materials with porous materials is mostly based on There are few studies on the preparation of comprehensive performance-enhanced CPCMs supported by inorganic materials and polymer aerogels.

Method used

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  • A kind of composite phase change material with pva as skeleton material and preparation method thereof
  • A kind of composite phase change material with pva as skeleton material and preparation method thereof
  • A kind of composite phase change material with pva as skeleton material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0044] The preparation of composite phase change material comprises the following steps:

[0045] Step 1): At room temperature, add PVA (molecular weight 146000-186000) into deionized water according to 5% mass fraction, stir for 30 minutes to make it swell, then raise the temperature to 97 ° C, stir for 2 hours, and obtain a PVA aqueous solution;

[0046] Step 2): Inject the aqueous solution obtained in the above step 1 into a twelve-well plate, put it in the refrigerator to freeze for 12 hours, then take it out, and thaw it for 12 hours. One freeze-thaw cycle to get a stronger hydrogel;

[0047] Step 3): Take out the hydrogel in the above step 2 from the twelve-hole plate, put it into an aqueous solution of sodium tetraborate (the mass fraction of sodium tetraborate in the aqueous solution is 2%) and soak for 24 hours, then take it out and clean it to obtain PVA hydrogel with cross-linked structure;

[0048] Step 4): Put the hydrogel in the above step 3 in a six-well plate, ...

Embodiment 2

[0053] Step): At room temperature, add PVA (molecular weight 146000-186000) into deionized water according to 5% mass ratio, stir for 30 minutes to make it swell, then raise the temperature to 97° C., and stir for 2 hours to obtain a PVA aqueous solution;

[0054] Step 2): Inject the aqueous solution obtained in the above step 1 into a twelve-well plate, put it in the refrigerator to freeze for 12 hours, then take it out, and thaw it for 12 hours. One freeze-thaw cycle to get a stronger hydrogel;

[0055] Step 3): Take out the hydrogel in the above step 2 from the twelve-hole plate, put it into an aqueous solution of sodium tetraborate (the mass fraction of sodium tetraborate in the aqueous solution is 2%) and soak for 24 hours, then take it out and clean it to obtain PVA hydrogel with cross-linked structure;

[0056] Step 4): Put the hydrogel in the above step 3 in a six-well plate, inject a certain amount of deionized water to completely immerse the PVA hydrogel, and then f...

Embodiment 3

[0061] Step): At room temperature, add PVA (molecular weight 146000-186000) into deionized water according to 5% mass ratio, stir for 30 minutes to make it swell, then raise the temperature to 97° C., and stir for 2 hours to obtain a PVA aqueous solution;

[0062] Step 2): Inject the aqueous solution obtained in the above step 1 into a twelve-well plate, put it in the refrigerator to freeze for 12 hours, then take it out, and thaw it for 12 hours. One freeze-thaw cycle to get a stronger hydrogel;

[0063] Step 3): Take out the hydrogel in the above step 2 from the twelve-hole plate, put it into an aqueous solution of sodium tetraborate (the mass fraction of sodium tetraborate in the aqueous solution is 2%) and soak for 24 hours, then take it out and clean it to obtain PVA hydrogel with cross-linked structure;

[0064] Step 4): Put the hydrogel in the above step 3 in a six-well plate, inject a certain amount of deionized water to completely immerse the PVA hydrogel, and then f...

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Abstract

The invention belongs to the technical field of materials, in particular to the preparation and application of a composite phase change material, in particular to a composite phase change material with a polymer material as a skeleton. The invention provides a preparation method of a composite phase-change material. The preparation method comprises: using PVA airgel as a skeleton material, and loading a phase-change functional material on the skeleton material to prepare the composite phase-change material. The composite phase change material prepared by the method of the present invention has super high phase change material content, wherein the mass fraction of the phase change material in the composite phase change material is 94%, and because the pore diameter of the PVA airgel is suitable, it has a relatively large specific surface area and it has a good interaction with phase change materials, and the obtained airgel has super leak-proof performance for organic phase change materials. For example, for PEG phase change materials, heating at 40°C above the melting point for 60 hours does Leakage will occur, and the overall performance is obviously better than that of existing phase change materials.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to the preparation and application of a composite phase change material, in particular to a composite phase change material with a polymer material as a skeleton. Background technique [0002] With the rapid growth of population and the acceleration of industrialization, the problem of energy crisis has become increasingly prominent. Vigorously develop advanced energy storage technology to alleviate the contradiction between energy supply and demand. As an energy storage technology, phase change materials (PCMs) can store large amounts of energy in the form of latent heat during phase transitions. Phase change materials are divided into inorganic phase change materials and organic phase change materials. Although organic phase change materials have the advantages of no phase separation and small undercooling, there is still a problem of liquid leakage during the phase...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K5/06
CPCC09K5/063
Inventor 杨伟阳立柯凯包睿莹刘正英杨鸣波
Owner SICHUAN UNIV
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