Composite phase-change material using PVA as skeleton, and preparation method thereof

Abstract

The invention belongs to the technical field of materials, specially relates to preparation and applications of a composite phase-change material, particularly to a composite phase-change material using a macromolecule material as a skeleton, and provides a composite phase-change material preparation method, which comprises: loading a phase-change functional material onto a PVA aerogel as a framework material to obtain the composite phase-change material. According to the invention, the composite phase-change material prepared by the method has ultrahigh phase-change material content, whereinthe mass fraction of the phase-change material in the composite phase-change material is 94%; and the PVA aerogel has proper pore size and large specific surface area, and has good interaction with the phase-change material, so that the obtained aerogel has super-strong anti-leakage performance on the organic phase-change material, wherein the PEG phase-change material cannot leakage after being heated for 60 h at a temperature of higher than the melting point of 40 DEG C, so that the comprehensive performance is obviously superior to the comprehensive performance of the existing phase-changematerial.

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...

Examples

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...

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...

Examples

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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