CN113136172A - Light storage and heat storage type composite phase change material for energy storage and preparation method thereof - Google Patents
Light storage and heat storage type composite phase change material for energy storage and preparation method thereof Download PDFInfo
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Abstract
The invention provides a preparation method of a light storage and heat storage type composite phase change material for energy storage, which comprises the following steps: adding polyvinyl alcohol into deionized water, and stirring and dissolving to obtain a polyvinyl alcohol solution; mixing a cross-linking agent and a 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 until the first mixed solution and the polyvinyl alcohol solution are uniformly dispersed to obtain a second mixed solution; pre-freezing the second mixed solution to a solid state, and then freezing and drying to obtain the polyvinyl alcohol-based composite aerogel; mixing the phase-change material and the light-storing particles to obtain a phase-change core material; and (3) immersing the polyvinyl alcohol-based composite aerogel into the phase change core material in vacuum, and cooling to room temperature to obtain the light-storage and heat-storage composite phase change material. The composite phase-change material provided by the invention has the characteristics of high phase-change enthalpy, high heat conductivity, low leakage rate, excellent light storage and heat storage performances.
Description
Technical Field
The invention relates to the technical field of energy storage, in particular to a light and heat storage type composite phase change material for energy storage and a preparation method thereof.
Background
Energy is an essential factor for human survival and development, but the utilization efficiency of human energy cannot reach 100%, and most of the unused energy is lost in the forms of light, heat and the like, so that huge waste is caused. In the next decades, fossil energy can still be the main energy of human beings, and considering the non-regenerability of fossil energy and the serious consequences on the earth environment, it is necessary to recycle lost energy and optimize and improve the utilization efficiency of energy.
The phase-change material can complete the absorption and release of heat in the process of phase-state transition, can effectively complete waste heat recovery, and is an ideal energy storage material. Phase change materials can be classified into solid-solid, solid-liquid, solid-gas, and liquid-gas phase change materials according to the phase change mode. The solid-liquid phase change material has the advantages of large phase change latent heat, wide phase change temperature range, easiness in control and the like, but the solid-liquid phase change material has some obvious defects in the practical application process, such as low thermal conductivity, nonuniform heating, easiness in leakage of melting, poor shape stability, single energy storage and release form, capability of only storing and releasing heat energy and the like. These disadvantages greatly limit the application of solid-liquid phase change materials.
Disclosure of Invention
In view of this, the invention provides a light-storage and heat-storage type composite phase change material for energy storage with high phase change enthalpy, high thermal conductivity and low leakage rate, and also provides a preparation method of the light-storage and heat-storage type composite phase change material.
The invention provides a preparation method of a light storage and heat storage type composite phase change material for energy storage, which comprises the following steps:
s1, adding polyvinyl alcohol into deionized water, and stirring and dissolving to obtain a polyvinyl alcohol solution;
s2, mixing the cross-linking agent and the heat-conducting filler, and ultrasonically stirring to obtain a first mixed solution;
s3, mixing the first mixed solution with a polyvinyl alcohol solution, and stirring until the first mixed solution and the polyvinyl alcohol solution are uniformly dispersed to obtain a second mixed solution;
s4, pre-freezing the second mixed solution, and then freezing and drying to obtain the polyvinyl alcohol-based composite aerogel;
s5, mixing the phase change material and the light storage particles to obtain a phase change core material solution;
and S6, vacuum-immersing the polyvinyl alcohol-based composite aerogel into the phase change core material solution, and cooling to room temperature to obtain the light-storage and heat-storage composite phase change material.
Further, in step S1, the concentration of the polyvinyl alcohol solution is 10-30mg/mL, the temperature for stirring and dissolving is 85-100 ℃, and the stirring time is 1.5-3 h.
Further, the cross-linking agent is any one of paraformaldehyde, glutaraldehyde, boric acid, borate, maleic anhydride, phthaloyl chloride, phthalic anhydride, succinic anhydride, phthalic acid, epichlorohydrin or copper hydroxide, and the concentration of the cross-linking agent in the first mixed solution is 2-10 mg/mL.
Further, the heat-conducting filler is any one of MXene, boron nitride, aluminum powder, copper powder, silicon carbide, carbon fiber, graphite powder, expanded graphite, graphene nanosheets and carbon nanotubes, and the concentration of the heat-conducting filler in the first mixed solution is 0-20 mg/mL. Preferably, the heat conducting filler is any one of MXene, boron nitride, aluminum nitride, graphene nanoplatelets and carbon nanotubes.
Further, in step S2, the temperature of ultrasonic agitation is 20-40 ℃ and the time is 10-30 min.
Further, in step S3, the heat conductive filler: a crosslinking agent: the mass ratio of the polyvinyl alcohol is as follows: (0-10): 1: (3-8).
Further, in step S3, the stirring temperature is 80-100 deg.C and the stirring time is 10-30 min.
Further, in step S4, the temperature of freeze drying is-52 to-47 ℃, the vacuum pressure is less than or equal to 80Pa, and the time is 36 to 72 hours; the frozen water molecules in the second mixed solution can be directly sublimated into water vapor to escape through freeze drying.
Further, the pre-freezing mode is liquid nitrogen freezing for 0.5-3h or refrigerator freezing for 10-24 h.
Further, in step S5, the phase change material is selected from any one of paraffin, polyethylene glycol, stearic acid, stearyl alcohol, and octadecylamine.
Further, the light storage particles are selected from any one of metal sulfide, alkaline earth aluminate or alkaline earth silicate, and the usage amount of the light storage particles is 0-10% of the total mass of the phase change core material; wherein, the chemical general formula of the metal sulfide is CaS: m1(M1 ═ Cu, Bi, Eu); the chemical general formula of the alkaline earth aluminate is M2AlO4: eu, Re (M2 ═ Ce, Sr, Ba, Eu as activator, Re as rare earth), alkaline earth silicate having general chemical formula of Ca8M3(SiO4)4Cl2(M3＝Mg，Zn)。
Further, in step S6, the temperature of vacuum impregnation is 70-90 ℃, the time is 0.5-12h, the vacuum pressure is less than or equal to 100Pa, and the load is 95-99%, wherein the load refers to the mass ratio of the phase-change core material to the composite phase-change material.
The invention also provides the light storage and heat storage type composite phase change material for energy storage prepared by the preparation method.
The technical scheme provided by the invention has the beneficial effects that:
1. the composite phase-change material provided by the invention has the characteristics of high phase-change enthalpy, high heat conductivity, low leakage rate, excellent light storage and heat storage performances, and the polyvinyl alcohol-based aerogel is used as a supporting framework of the phase-change material, so that the shape stability of the phase-change material can be kept, the leakage of the phase-change material is greatly reduced, and meanwhile, the added heat-conducting filler can realize high-speed heat transfer, and the heat-conducting performance of the phase-change material is greatly improved; the phase-change core material loaded by the aerogel can not only complete the absorption and release of heat in the phase-change process, but also absorb and store natural and artificial light by the added light-storing particles, thereby realizing the storage of heat energy and light energy;
2. the preparation method provided by the invention is simple in steps, strong in operability, high-efficiency and environment-friendly.
Drawings
Fig. 1 is a schematic flow chart of a method for preparing a light-storage and heat-storage composite phase change material for energy storage according to the present invention.
Fig. 2 is a XRD test result chart of the light storage and heat storage type composite phase change material prepared in example 1 of the present invention.
Fig. 3 is a scanning electron microscope image of the light storage and heat storage type composite phase change material prepared in example 1 of the present invention.
Fig. 4 is a state diagram of the light storage and heat storage type composite phase change material prepared in example 1 of the present invention before and after heating.
Fig. 5 is a heat conduction performance test chart of the light storage and heat storage type composite phase change material prepared in embodiment 1 of the present invention.
Fig. 6 is a schematic light-emitting view of the light-storage and heat-storage composite phase change material prepared in embodiment 1 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be further described with reference to the accompanying drawings.
Referring to fig. 1, an embodiment of the present invention provides a method for preparing a light-storing and heat-storing composite phase change material for energy storage, including the following steps:
step S1, adding polyvinyl alcohol into deionized water, stirring and dissolving for 1.5-3h at 85-100 ℃ to obtain polyvinyl alcohol solution with the concentration of 10-30 mg/mL;
step S2, mixing the cross-linking agent and the heat-conducting filler, and ultrasonically stirring for 10-30min at 20-40 ℃ to obtain a first mixed solution; wherein, the heat conduction filler: a crosslinking agent: the mass ratio of the polyvinyl alcohol is as follows: (0-10): 1: (3-8); the cross-linking agent is any one of paraformaldehyde, glutaraldehyde, boric acid, borate, maleic anhydride, phthaloyl chloride, phthalic anhydride, succinic anhydride, phthalic acid, epichlorohydrin or copper hydroxide, and the concentration of the cross-linking agent in the first mixed solution is 2-10 mg/mL; the heat-conducting filler is any one of MXene, boron nitride, aluminum powder, copper powder, silicon carbide, carbon fiber, graphite powder, expanded graphite, graphene nanosheets and carbon nanotubes, and the concentration of the heat-conducting filler in the first mixed solution is 0-20 mg/mL;
step S3, mixing the first mixed solution with a polyvinyl alcohol solution, and stirring at 80-100 ℃ for 10-30min to obtain a second mixed solution;
step S4, pre-freezing the second mixed solution, and freeze-drying for 36-72h at the temperature of-52 ℃ to-47 ℃ and under the vacuum pressure of less than or equal to 80Pa to obtain the polyvinyl alcohol-based composite aerogel; wherein the pre-freezing mode is liquid nitrogen freezing for 0.5-3h or refrigerator freezing for 10-24 h;
step S5, mixing the phase-change material and the light-storing particles to obtain a phase-change core material solution; wherein the phase change material is selected from paraffin, polyethylene glycol, stearic acid, stearyl alcohol or stearyl alcoholAny one of amines; the light-storing particles are selected from any one of metal sulfide, alkaline earth aluminate or alkaline earth silicate, and the usage amount of the light-storing particles is 0-10% of the total mass of the phase-change core material; wherein, the chemical general formula of the metal sulfide is CaS: m1(M1 ═ Cu, Bi, Eu); the chemical general formula of the alkaline earth aluminate is M2AlO4: eu, Re (M2 ═ Ce, Sr, Ba, Eu as activator, Re as rare earth), alkaline earth silicate having general chemical formula of Ca8M3(SiO4)4Cl2(M3＝Mg，Zn)；
Step S6, immersing the polyvinyl alcohol-based composite aerogel into the phase change core material solution in vacuum, and cooling to room temperature to obtain the light storage and heat storage type composite phase change material; wherein the temperature of vacuum impregnation is 70-90 ℃, the time is 0.5-12h, the vacuum pressure is less than or equal to 100Pa, and the load is 95-99%.
The polyvinyl alcohol aerogel has the characteristics of high porosity and low density, and can load a large amount of phase change core materials, so that the polyvinyl alcohol aerogel can be used as a supporting framework of the phase change material, and the loaded phase change core materials have the advantages of good shape stability and low leakage. The heat conducting filler can greatly improve the heat conducting property of the phase change material; meanwhile, the phase-change material in the phase-change core material can absorb and release heat in the phase-change process, the added light-storing particles can store natural light or artificial light, and can present bright and identifiable visible light in the dark, and the phase-change material is long in light-emitting time, non-toxic and harmless, is a clean energy-saving material and can play a role in warning and reminding.
The following describes in detail the preparation method of the light storage and heat storage type composite phase change material provided by the present invention with reference to examples and comparative examples.
Example 1:
embodiment 1 of the present invention provides a method for preparing a light storage and heat storage type composite phase change material for energy storage, including the following steps:
step S1, adding 0.6g of polyvinyl alcohol into 30mL of deionized water, stirring and dissolving for 2h at 95 ℃ until the polyvinyl alcohol is completely dissolved to obtain a polyvinyl alcohol solution;
step S2, mixing and dissolving 0.12g of boric acid and 0.3g of Boron Nitride (BN) into 30mL of deionized water, and ultrasonically stirring for 15min at 30 ℃ to obtain a mixed solution of the boric acid and the boron nitride;
step S3, adding the mixed solution prepared in the step S2 into the polyvinyl alcohol solution prepared in the step S1, and continuously stirring for 20min at 95 ℃ until the solution is uniformly dispersed;
step S4, pre-freezing the mixed solution prepared in the step S3 in a refrigerator for 12 hours, and then freezing and drying for 72 hours at the temperature of minus 52 ℃ and under the vacuum pressure of 80Pa to obtain the polyvinyl alcohol-based composite aerogel;
step S5, mixing 95% polyethylene glycol and 5% CeAlO according to mass percentage4: eu and Re are mixed to obtain phase change core material solution,
and step S6, vacuum-immersing the polyvinyl alcohol-based composite aerogel prepared in the step S4 in the phase change core material solution prepared in the step S5, wherein the immersion temperature is 80 ℃, the immersion time is 2 hours, the vacuum pressure is 100Pa, the loading capacity is 96%, and after the immersion is finished, cooling to the room temperature to obtain the light-storage and heat-storage type composite phase change material.
Comparative example 1:
step S1, adding 0.6g of polyvinyl alcohol into 30mL of deionized water, stirring and dissolving for 2h at 95 ℃ until the polyvinyl alcohol is completely dissolved to obtain a polyvinyl alcohol solution;
step S2, dissolving 0.12g of boric acid in 30mL of deionized water, and ultrasonically stirring for 15min at 30 ℃ to obtain a boric acid solution;
step S3, adding the boric acid solution prepared in the step S2 into the polyvinyl alcohol solution prepared in the step S1, and continuously stirring for 20min at 95 ℃ until the solution is uniformly dispersed;
step S4, pre-freezing the mixed solution prepared in the step S3 in a refrigerator for 12 hours, and then freezing and drying for 72 hours at the temperature of minus 52 ℃ and under the vacuum pressure of 80Pa to obtain the polyvinyl alcohol-based composite aerogel;
step S5, mixing 95% of polyethylene glycol and 5% of CeAlO 4: eu and Re are mixed to obtain phase change core material solution,
and step S6, vacuum-soaking the polyvinyl alcohol-based composite aerogel prepared in the step S4 in the phase change core material solution prepared in the step S5 at the soaking temperature of 80 ℃ for 2 hours, at the vacuum pressure of 100Pa and at the loading capacity of 96%, and cooling to room temperature after soaking is finished, so that the polyvinyl alcohol-based aerogel composite phase change material is prepared.
XRD test is performed on the polyvinyl alcohol aerogel (marked as PA) and the polyvinyl alcohol-based composite aerogel (marked as PBA) prepared in step S4 in example 1, and the result is shown in fig. 2a, and as can be seen from fig. 2a, the polyvinyl alcohol aerogel added with boron nitride has a characteristic diffraction peak of boron nitride, which indicates that the aerogel modification is successful; for polyethylene glycol (PEG), CeAlO4: the XRD test on Eu, Re (LAL), the polyvinyl alcohol based aerogel composite phase change material (PPAL) prepared in comparative example 1, and the light and heat storage type composite phase change material (PPBAL) prepared in step S6 in example 1 shows that the diffraction peaks and CeAlO of the light and heat storage type composite phase change material are shown in fig. 2b, and can be seen from fig. 2b4: compared with diffraction peaks of Eu, Re and PEG, the diffraction peaks do not obviously shift and new diffraction peaks do not appear, and the fact that the phase change core material is successfully filled into the aerogel porous structure through vacuum impregnation shows that the light storage and heat storage type composite phase change material is prepared.
Scanning electron microscope observation is performed on polyvinyl alcohol aerogel, the polyvinyl alcohol-based composite aerogel prepared in step S4 in example 1, and the light-storage and heat-storage type composite phase change material prepared in step S6 in example 1, as shown in fig. 3, fig. 3a is a scanning electron microscope image of polyvinyl alcohol aerogel, and as shown in fig. 3a, the polyvinyl alcohol aerogel has a good three-dimensional structure; fig. 3b is a polyvinyl alcohol based composite aerogel (PBA) prepared in step S4 of example 1, and as can be seen from fig. 3b, after modification by adding boron nitride, white particles can be seen on the surface of the polyvinyl alcohol based composite aerogel, and as can be seen from fig. 3c, a scanning electron microscope image shows that the phase change core material completely occupies the pores of the light storage and heat storage type composite phase change material, indicating that the phase change core material and the aerogel have good compatibility.
Polyethylene glycol and the light and heat storage type composite phase change material PPBAL are respectively heated to 60 ℃ and kept for 30min, and samples before and after heating are photographed and observed to carry out leakage prevention tests, the results are shown in figure 4, figures 4a-b are respectively state diagrams before and after heating polyethylene glycol, figures 4c-d are respectively state diagrams before and after heating light and heat storage type composite phase change material PPBAL, as shown in figure 4, polyethylene glycol is already changed into a liquid state after heating, but the composite phase change material has no obvious leakage, and the composite phase change material is shown to have good leakage prevention capability.
The heat conductivity instrument is utilized to respectively carry out heat conductivity tests on the polyethylene glycol and the light storage and heat storage type composite phase change material PPBAL, the result is shown in figure 5, and as can be seen from figure 5, after boron nitride is added into the aerogel, the heat conductivity coefficient is obviously improved.
The light-storage and heat-storage type composite phase change material prepared in step S6 in example 1 was irradiated under a xenon lamp for 5min, and then the phase change material was observed in the dark for the time and brightness of light emission. As shown in fig. 6, the composite phase change material can still show bright and distinguishable visible light in the dark for 60min, which indicates that the composite phase change material has good light storage and self-luminescence properties.
Example 2:
the embodiment 2 of the invention provides a preparation method of a light storage and heat storage type composite phase change material for energy storage, which comprises the following steps:
step S1, adding 0.6g of polyvinyl alcohol into 30mL of deionized water, stirring and dissolving for 2h at 95 ℃ until the polyvinyl alcohol is completely dissolved to obtain a polyvinyl alcohol solution;
step S2, mixing and dissolving 0.15g of boric acid and 0.15g of silicon carbide into 30mL of deionized water, and ultrasonically stirring for 30min at 25 ℃ to obtain a mixed solution of boric acid and silicon carbide;
step S3, mixing the mixed solution prepared in the step S2 with the polyvinyl alcohol solution prepared in the step S1, and continuously stirring for 30min at 85 ℃ until the solution is uniformly dispersed;
step S4, pre-freezing the mixed solution prepared in the step S3 in liquid nitrogen for 30min, and then freezing and drying for 48h at the temperature of minus 50 ℃ and under the vacuum pressure of 60Pa to obtain the polyvinyl alcohol-based composite aerogel;
step S5, mixing 95% polyethylene glycol and 5% SrAlO4: eu and Re are mixed to prepare a phase change core material solution;
and step S6, vacuum-immersing the polyvinyl alcohol-based composite aerogel prepared in the step S4 in the phase change core material solution prepared in the step S5, wherein the immersion temperature is 80 ℃, the immersion time is 5 hours, the vacuum pressure is 100Pa, the loading capacity is 98%, and after the immersion, cooling to the room temperature to prepare the light-storage and heat-storage type composite phase change material.
Example 3:
embodiment 3 of the present invention provides a method for preparing a light storage and heat storage type composite phase change material for energy storage, including the following steps:
step S1, adding 0.6g of polyvinyl alcohol into 30mL of deionized water, stirring and dissolving for 2h at 95 ℃ until the polyvinyl alcohol is completely dissolved to obtain a polyvinyl alcohol solution;
step S2, mixing and dissolving 0.2g of glutaraldehyde and 0.4g of Carbon Nano Tube (CNT) into 30mL of deionized water, and ultrasonically stirring for 20min at 30 ℃ to obtain a mixed solution of the CNT and the glutaraldehyde;
step S3, adding the mixed solution prepared in the step S2 into the polyvinyl alcohol solution prepared in the step S1, and continuously stirring for 15min at 90 ℃ until the solution is uniformly dispersed;
step S4, pre-freezing the mixed solution prepared in the step S3 in a refrigerator for 10 hours, and then freezing and drying the mixed solution for 60 hours at the temperature of minus 45 ℃ and under the vacuum pressure of 60Pa to obtain the polyvinyl alcohol-based composite aerogel;
step S5, mixing 98% of stearic acid and 2% of CaS: mixing Cu to prepare a phase-change core material solution;
and step S6, vacuum-immersing the polyvinyl alcohol-based composite aerogel prepared in the step S4 in the phase change core material solution prepared in the step S5, wherein the immersion temperature is 85 ℃, the immersion time is 3 hours, the vacuum pressure is 100Pa, and the loading capacity is 97%, and after the immersion, cooling to the room temperature to prepare the light-storage and heat-storage type composite phase change material.
Example 4:
embodiment 4 of the present invention provides a method for preparing a light storage and heat storage type composite phase change material for energy storage, including the following steps:
step S1, adding 1.2g of polyvinyl alcohol into 60mL of deionized water, stirring and dissolving for 3h at 100 ℃ until the polyvinyl alcohol is completely dissolved to obtain a polyvinyl alcohol solution;
step S2, mixing and dissolving 0.20g of paraformaldehyde and 0.5g of aluminum nitride into 50mL of deionized water, and ultrasonically stirring for 30min to obtain a mixed solution of aluminum nitride and paraformaldehyde;
step S3, adding the mixed solution prepared in the step S2 into the polyvinyl alcohol solution prepared in the step S1, and continuously stirring for 30min at 95 ℃ until the solution is uniformly dispersed;
step S4, pre-freezing the mixed solution prepared in the step S3 in liquid nitrogen for 1h, and then freezing and drying for 72h at the temperature of minus 50 ℃ and under the vacuum pressure of 70Pa to obtain the polyvinyl alcohol-based composite aerogel;
step S5, mixing 98% of octadecanol and 2% of Ca according to mass percentage8Mg(SiO4)4Cl2Mixing to prepare a phase-change core material solution;
step S6, the polyvinyl alcohol-based composite aerogel prepared in the step S4 is immersed in the phase change core material solution prepared in the step S5 in vacuum, the immersion temperature is 75 ℃, the immersion time is 4 hours, the vacuum pressure is 100Pa, the loading capacity is 98%, and after immersion is finished, the polyvinyl alcohol-based composite aerogel is cooled to the room temperature to prepare the light storage and heat storage type composite phase change material.
The features of the embodiments and embodiments described herein above may be combined with each other without conflict.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A preparation method of a light storage and heat storage type composite phase change material for energy storage is characterized by comprising the following steps:
s1, adding polyvinyl alcohol into deionized water, and stirring and dissolving to obtain a polyvinyl alcohol solution;
s2, mixing the cross-linking agent and the heat-conducting filler, and ultrasonically stirring to obtain a first mixed solution;
s3, mixing the first mixed solution with a polyvinyl alcohol solution, and stirring until the first mixed solution and the polyvinyl alcohol solution are uniformly dispersed to obtain a second mixed solution;
s4, pre-freezing the second mixed solution, and then freezing and drying to obtain the polyvinyl alcohol-based composite aerogel;
s5, mixing the phase change material and the light storage particles to obtain a phase change core material solution;
and S6, vacuum-immersing the polyvinyl alcohol-based composite aerogel into the phase change core material solution, and cooling to room temperature to obtain the light-storage and heat-storage composite phase change material.
2. The method for preparing a light-storing and heat-storing composite phase change material for energy storage according to claim 1, wherein in step S1, the concentration of the polyvinyl alcohol solution is 10-30mg/mL, the temperature for stirring and dissolving is 85-100 ℃, and the stirring time is 1.5-3 h.
3. The method for preparing the light-storing and heat-storing composite phase-change material for energy storage according to claim 1, wherein the cross-linking agent is any one of paraformaldehyde, glutaraldehyde, boric acid, borate, maleic anhydride, phthaloyl chloride, phthalic anhydride, succinic anhydride, phthalic acid, epichlorohydrin or copper hydroxide.
4. The method for preparing the light-storing and heat-storing composite phase-change material for energy storage according to claim 1, wherein the concentration of the heat-conducting filler in the first mixed solution is 0-20mg/mL, and the heat-conducting filler is any one of MXene, boron nitride, aluminum powder, copper powder, silicon carbide, carbon fiber, graphite powder, expanded graphite, graphene nanosheet and carbon nanotube.
5. The method for preparing a light-storing and heat-storing composite phase-change material for energy storage according to claim 1, wherein in step S2, the temperature of ultrasonic agitation is 20-40 ℃ and the time is 10-30 min.
6. The method for preparing a light-storing and heat-storing composite phase change material for energy storage according to claim 1, wherein in step S3, the heat conductive filler: a crosslinking agent: the mass ratio of the polyvinyl alcohol is as follows: (0-10): 1: (3-8).
7. The method for preparing a light-storing and heat-storing composite phase-change material for energy storage according to claim 1, wherein in step S5, the phase-change material is any one of paraffin, polyethylene glycol, stearic acid, stearyl alcohol, or octadecylamine.
8. The method for preparing the light-storing and heat-storing composite phase-change material for energy storage according to claim 1, wherein the light-storing particles are selected from any one of metal sulfide, alkaline earth aluminate or alkaline earth silicate, and the usage amount of the light-storing particles is 0-10% of the total mass of the phase-change core material.
9. The method for preparing the light-storing and heat-storing composite phase change material for energy storage according to claim 1, wherein in step S6, the temperature of vacuum impregnation is 70-90 ℃, the time is 0.5-12h, the vacuum pressure is less than or equal to 100Pa, and the loading is 95% -99%.
10. The light storage and heat storage type composite phase change material for energy storage prepared by the preparation method of any one of claims 1 to 9.
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