CN112980395A - Nano phase-change heat storage and release material and preparation method thereof - Google Patents
Nano phase-change heat storage and release material and preparation method thereof Download PDFInfo
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- CN112980395A CN112980395A CN202110262513.XA CN202110262513A CN112980395A CN 112980395 A CN112980395 A CN 112980395A CN 202110262513 A CN202110262513 A CN 202110262513A CN 112980395 A CN112980395 A CN 112980395A
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- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
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- C09K5/06—Materials undergoing a change of physical state when used the change of state being from liquid to solid or vice versa
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Abstract
The invention provides a nano phase-change heat storage and release material and a preparation method thereof, belonging to the technical field of phase-change materials. The nanometer phase change heat storage and release material provided by the invention comprises paraffin, high-density polyethylene and expanded graphite; the mass ratio of the paraffin, the high-density polyethylene and the expanded graphite is 9:1: (0.1-0.7). In the nano phase-change heat storage and release material provided by the invention, paraffin is an excellent heat storage medium, but the fused liquid paraffin is easy to cause leakage, so that the stability of a heat storage device is hindered, and in order to reduce the leakage, high-density polyethylene is adopted as a packaging carrier, so that the leakage rate of the nano phase-change heat storage and release material is reduced; the expanded graphite has an expanded loose structure, provides an effective heat network as a heat-conducting filler and enhances the adsorption of paraffin; the material provided by the invention has the advantages of moderate thermal conductivity, low leakage rate, 25.9% improvement of temperature response speed, and good thermal stability after more than 100 thermal cycle tests.
Description
Technical Field
The invention relates to the technical field of phase-change materials, in particular to a nanometer phase-change heat storage and release material and a preparation method thereof.
Background
The solar agricultural product drying technology is a technology for drying fresh agricultural products into dehydrated products by taking solar energy as a heat source, has the characteristics and the efficiency of energy conservation, cost saving and environmental protection, and is one of ideal modes for drying the agricultural products. The greenhouse is used as an important facility in agricultural production, and due to the anti-seasonal and anti-regional functional characteristics of the greenhouse, a proper microclimate environment is provided for the winter cultivation of horticultural crops. The heat supply modes of solar agricultural product drying technology and greenhouse horticultural crop winter cultivation mainly include hot water heating, hot air heating, steam heating, electric heating, radiation heating, fuel combustion heating, solar heat storage heating and the like. The solar heat storage and supply is a technology for collecting solar radiation by a solar heat collector and converting the solar radiation into heat energy for heat storage and supply. However, since solar energy is not stably supplied, in order to supply load demand in rainy (snowy) days and at night, heat energy needs to be stored in a heat storage material, load heat energy needs to be stably supplied, heat collected by solar energy in daytime needs to be stored, and heat is released in heat demand facilities, which requires that the heat storage material has the characteristics of fast heat storage and slow heat release.
Phase Change Materials (PCMs), which allow the storage and release of thermal energy through a solid-liquid phase change process, have been widely used in thermal management systems. At present, organic phase change materials (such as paraffin, palmitic acid, polyethylene glycol and the like) are widely researched due to the advantages of high latent heat density, no pollution and recyclability. However, the organic PCM has disadvantages of low thermal conductivity and easy leakage, which greatly affects the storage and release of heat of the organic PCM.
In order to solve the problem of low thermal conductivity, a method of adding a thermal conductive filler to the PCM is generally used. Commonly used thermally conductive fillers include metals and their oxides (e.g., aluminum-iron-copper based), carbon-based materials (e.g., carbon nanotubes, graphene, carbon foam, etc.), and other materials (e.g., silicon dioxide, boron nitride, etc.). In order to reduce the loss of the organic PCM in the molten state, it is often necessary to add an encapsulating material to fix the organic PCM, and the encapsulating material, the porous material adsorption and the electrospinning technology, are studied. For example, "influencing factor of thermal conductivity of paraffin/high density polyethylene/expanded graphite heat conduction enhanced composite phase change material" (polymer science and engineering, volume 31, phase 5, 2015, page 83-86) discloses a paraffin/high density polyethylene/expanded graphite heat conduction enhanced composite phase change material, which has thermal conductivity of PMC2 and PMC3 of 0.617W/(m · K) and 0.883W/(m · K); "preparation and performance of HDPE/EG/paraffin heat-conducting shape-stabilized phase-change material" (material engineering, volume 43, No. 4, 2015, page 42-46) discloses that when the paraffin content is 70%, the EG content is 3%, 5% and 7%, the thermal conductivity of the PCM is 0.548-0.815W/(m.K). However, the paraffin/high density polyethylene/expanded graphite composite material has a large latent heat loss, and thus cannot simultaneously achieve both a high heat storage rate and a low heat release rate.
Disclosure of Invention
In view of the above, the present invention aims to provide a nano phase change heat storage and release material and a preparation method thereof, the nano phase change heat storage and release material provided by the present invention has the advantages of medium thermal conductivity, low leakage rate, 25.9% improvement of temperature response speed, small latent heat loss, and good thermal stability after more than 100 times of thermal cycle (0-70 ℃) tests.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a nano phase change heat storage and release material, which comprises paraffin, high-density polyethylene and expanded graphite;
the mass ratio of the paraffin, the high-density polyethylene and the expanded graphite is 9:1: (0.1-0.7).
The invention provides a preparation method of the nano phase change heat storage and release material in the technical scheme, which comprises the following steps:
melting paraffin to obtain molten paraffin;
mixing the molten paraffin and the high-density polyethylene powder for the first time to obtain viscous paraffin/high-density polyethylene;
and secondly, mixing the viscous paraffin/high-density polyethylene and the expanded graphite, and cooling to obtain the nano phase-change heat storage and release material.
Preferably, the melting temperature is 45-85 ℃.
Preferably, the particle size of the high-density polyethylene powder is 80-200 meshes.
Preferably, the temperature of the first mixing is 130-200 ℃ and the time is 2-4 h.
Preferably, the temperature of the second mixing is 130-200 ℃ and the time is 1-2 h.
The invention also provides the application of the nano phase change heat storage and release material in the technical scheme or the nano phase change heat storage and release material prepared by the preparation method in the technical scheme in solar drying or greenhouse heat fixation.
The invention provides a nano phase change heat storage and release material (paraffin/HDPE/EG), which comprises paraffin, high-density polyethylene and expanded graphite; the mass ratio of the paraffin, the high-density polyethylene and the expanded graphite is 9:1: (0.1-0.7). In the nanometer phase-change heat storage and release material (PCM), Paraffin (Paraffin) is an excellent heat storage medium, but molten liquid Paraffin is easy to leak, so that the stability of a heat storage device is hindered; in order to reduce leakage, High Density Polyethylene (HDPE) is used as a packaging carrier, so that the leakage rate of the nano phase change heat storage and release material is reduced; expanded Graphite (EG) has an expanded, porous structure, providing an effective thermal network as a thermally conductive filler and enhancing paraffin adsorption; the nano phase change heat storage and release material provided by the invention has the advantages of medium thermal conductivity, low permeability, 25.9% improvement of temperature response speed, small latent heat loss, and good thermal stability shown by more than 100 thermal cycle tests.
The preparation method provided by the invention is simple to operate and suitable for industrial production.
Drawings
FIG. 1 is an SEM photograph of EG and PCM10-5 prepared in example 1, where (a) is an SEM photograph of EG at 10 μm scale, (b) is an SEM photograph of EG at 2 μm scale, (c) is an SEM photograph of PCM10-5 at 10 μm scale, and (d) is an SEM photograph of PCM10-5 at 2 μm scale;
FIG. 2 is an X-ray diffraction pattern of Paraffin, HDPE, EG and PCM10-5 prepared in example 1;
FIG. 3 is a Fourier infrared spectrum of Paraffin, HDPE, EG and PCM10-5 prepared in example 1;
FIG. 4 is a differential scanning calorimetry chart of Paraffin and PCM10-5 prepared in example 1 during melting and solidification;
FIG. 5 is a temperature-time curve of the melting and solidification process of the nano phase change exothermic material prepared in examples 1 to 3 and the paraffin/high density polyethylene prepared in comparative example 1, wherein a is a melting curve and b is a solidification curve;
FIG. 6 differential scanning calorimetry plots of PCM10-5 prepared in example 1 during different cycles of melting and solidification, where a is melting and b is solidification;
FIG. 7 is a graph of the cycle stability of latent heat for PCM10-5 prepared in example 1;
FIG. 8 is a plot of Fourier infrared spectra at various periods for PCM10-5 prepared in example 1;
FIG. 9 is a graph of the results of a bleed test at 70 ℃ for PCM10-5 prepared in example 1, Paraffin/HDPE (9:1) prepared in comparative example 1, and neat Paraffin wax (Paraffin);
FIG. 10 is a graph showing the results of latent heat cycle stability of PCM2 and PCM3 prepared in comparative example 4;
fig. 11 is a graph of latent heat cycle stability of the PCM prepared in comparative example 5.
Detailed Description
The invention provides a nano phase change heat storage and release material, which comprises paraffin, high-density polyethylene and expanded graphite;
the mass ratio of the paraffin, the high-density polyethylene and the expanded graphite is 9:1: (0.1-0.7).
In the present invention, all the raw material components are commercially available products well known to those skilled in the art unless otherwise specified.
In the present invention, the melting point of the paraffin is preferably 47 to 50 ℃.
In the invention, the particle size of the high-density polyethylene is preferably 80-200 meshes, and more preferably 100-150 meshes; the high density polyethylene is preferably purchased from Xinglong plastics Co., Ltd.
In the present invention, the expanded graphite is preferably purchased from Jiangsu Xiancheng nanomaterial science and technology Co., Ltd (XFINANO Co.).
In the invention, the mass ratio of the paraffin, the high-density polyethylene and the expanded graphite is 9:1: (0.1 to 0.7), preferably 9:1: (0.2 to 0.6), more preferably 9:1: (0.3-0.5).
The invention provides a preparation method of the nano phase change heat storage and release material in the technical scheme, which comprises the following steps:
melting paraffin to obtain molten paraffin;
mixing the molten paraffin and the high-density polyethylene powder for the first time to obtain viscous paraffin/high-density polyethylene;
and secondly, mixing the viscous paraffin/high-density polyethylene and the expanded graphite, and cooling to obtain the nano phase-change heat storage and release material.
The invention melts the paraffin to obtain the molten paraffin. In the invention, the melting temperature is preferably 45-85 ℃, more preferably 50-80 ℃, and most preferably 60-70 ℃.
After obtaining the molten paraffin, the invention firstly mixes the molten paraffin and the high-density polyethylene powder to obtain the viscous paraffin/high-density polyethylene. In the present invention, the particle size of the high-density polyethylene powder is preferably 80 to 200 mesh, and more preferably 100 to 150 mesh. In the invention, the temperature of the first mixing is preferably 130-200 ℃, and more preferably 150-170 ℃; the first mixing time is preferably 2-4 h, and more preferably 2.5-3 h; in the present invention, the speed and time of the stirring and mixing are not particularly limited, and the HDPE can be sufficiently dispersed in the paraffin.
After the viscous paraffin/high-density polyethylene is obtained, the viscous paraffin/high-density polyethylene and the expanded graphite are mixed for the second time and then cooled, and the nano phase change heat storage and release material is obtained.
In the invention, the temperature of the second mixing is 130-200 ℃, and more preferably 150-170 ℃; the second mixing time is preferably 1-2 hours, and more preferably 1-1.5 hours; the second mixing method is preferably stirring mixing, and the present invention is not particularly limited to the speed and time of stirring mixing, and the expanded graphite may be sufficiently dispersed in the viscous paraffin/high density polyethylene.
After the second mixing, the present invention preferably further comprises placing the second mixed product in a mold and cooling, and the mold is not particularly limited in the present invention, and a mold well known to those skilled in the art may be used; the cooling method of the present invention is not particularly limited, and the cooling method known to those skilled in the art may be used to cool the glass substrate to room temperature.
The invention also provides the application of the nano phase change heat storage and release material in the technical scheme or the nano phase change heat storage and release material prepared by the preparation method in the technical scheme in solar dry agricultural products or greenhouse heat supply.
The nano phase change heat storage and release material provided by the invention has the advantages of moderate heat conductivity, low permeability, higher temperature response speed than that of pure paraffin, good thermal stability,
the technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Paraffin (thermal conductivity of 0.239W/(m.K)) is placed in a beaker to be melted at 70 ℃ to obtain molten Paraffin;
adding HDPE powder (200 meshes) into molten paraffin and stirring for 2 hours at 130 ℃ under the stirring condition to uniformly disperse HDPE in paraffin to obtain viscous paraffin/high-density polyethylene;
and adding EG into the viscous Paraffin/high-density polyethylene, continuously stirring and mixing for 1h, pouring the mixture into a mould, and cooling to room temperature to obtain the nano phase-change heat storage and release material (PCM 10-5), wherein the mass ratio of Paraffin, HDPE and EG is 9:1: 0.5.
The thermal conductivity of the PCM10-5 is 0.641W/(m.K), and the thermal conductivity is improved by 168% compared with that of pure paraffin.
SEM pictures of EG and PCM10-5 prepared in example 1 are shown in FIG. 1, where (a) is an SEM picture of EG at 10 μm scale, (b) is an SEM picture of EG at 2 μm scale, (c) is an SEM picture of PCM10-5 at 10 μm scale, and (d) is an SEM picture of PCM10-5 at 2 μm scale. As can be seen from fig. 1, EG can not only be effectively mixed with paraffin, but also can construct an internal heat conduction path of PCM; PCM10-5 has good homogeneity among internal paraffin, HDPE and EG.
The X-ray diffraction patterns of Paraffin, HDPE, EG, and PCM10-5 prepared in example 1 are shown in FIG. 2. As can be seen from fig. 2, in HDPE, the main absorption peaks are located at 21.5 ° and 23.8 °, and can be assigned to the 110 and 200 basal planes of the orthorhombic crystal form of PE; in PCM10-5, the main absorption peak of EG at 26.5 ℃ is significantly diminished due to the low content of EG added; the addition of HDPE and EG has no influence on the crystalline phase and crystallinity of paraffin, and the structure of PCM10-5 is stable; it is shown that the paraffin, the high density polyethylene and the expanded graphite in the PCM10-5 are only a simple physical mixture and do not form a new chemical structure.
The Fourier infrared spectra of Paraffin, HDPE, EG, and PCM10-5 prepared in example 1 are shown in FIG. 3. As can be seen from FIG. 3, the main absorption peaks of HDPE are 2920, 1480 and 720cm-1Wherein the height is 2920cm-1is-CH of an alkane2Stretching and vibrating of the group; at 1480cm-1The absorption peak at (a) is the tensile vibration of ═ C; the infrared absorption peak of paraffin wax is similar to HDPE, which indicates that paraffin wax has a similar structure to HDPE and thus has good compatibility; absorption peaks for paraffin, EG, HDPE were found in PCM10-5, indicating that there was no chemical cross-linking between these materials.
Paraffin and differential scanning calorimetry (latent heat of phase change) during melting and solidification of PCM10-5 prepared in example 1 As shown in FIG. 4, it can be seen from FIG. 4 that the latent heat of phase change of PCM10-5 is 119J/g, and the latent heat (i.e., the amount of stored heat) of PCM10-5 is reduced by 14.57% compared to pure Paraffin (latent heat of phase change 139.3J/g).
Example 2
The nanometer phase-change heat storage and release material is prepared according to the method of the example 1, and is different from the example 1 in that the mass ratio of Paraffin, HDPE and EG is 9:1:0.3, so that the nanometer phase-change heat storage and release material (abbreviated as PCM10-3) is obtained; the PCM10-3 has the thermal conductivity of 0.516W/(m.K), the thermal conductivity is improved by 115 percent compared with pure paraffin, the latent heat of phase change is 118.9J/g, the heat loss is 14.6 percent (the heat loss is almost the same compared with 1, but the improvement of the thermal conductivity is smaller than 1)
Example 3
The nanometer phase-change heat storage and release material is prepared according to the method of the example 1, and is different from the example 1 in that the mass ratio of Paraffin, HDPE and EG is 9:1:0.1, so that the nanometer phase-change heat storage and release material (abbreviated as PCM10-1) is obtained; the thermal conductivity of the PCM10-1 is 0.341W/(m.K), and the thermal conductivity is improved by 42.7 percent compared with that of pure paraffin; PCM10-1 has a latent heat of phase change of 131.5J/g and heat loss of 6%.
Comparative example 1
Placing Paraffin in a beaker to melt at 70 ℃ to obtain molten Paraffin;
adding HDPE powder (200 meshes) into molten paraffin and stirring for 2 hours at 130 ℃ under the stirring condition to uniformly disperse HDPE in paraffin to obtain viscous paraffin/high-density polyethylene;
placing the viscous Paraffin/high-density polyethylene in a mould for cooling and curing to obtain Paraffin/high-density polyethylene (abbreviated as Paraffin/HDPE (9:1)), wherein the thermal conductivity of the Paraffin/HDPE (9:1) is 0.351W/(m.K), and the leakage rate at 70 ℃ limit temperature is 34.5%; wherein the mass ratio of Paraffin to HDPE is 9: 1.
Temperature-time curves of the nano phase change heat storage and release materials prepared in examples 1 to 3 and the paraffin/high density polyethylene prepared in comparative example 1 during melting and solidification at 25 ℃ are shown in fig. 5, wherein a is a melting curve and b is a solidification curve. As can be seen from FIG. 5, when the temperature is heated to 55 ℃ compared with Paraffin/HDPE (9:1), the heating time of PCM10-1, PCM10-3 and PCM10-5 is respectively shortened by 5.5%, 13.4% and 25.9%, which illustrates that the response speed of the nano phase change heat storage and release material prepared by the invention to the temperature is obviously faster than that of Paraffin/HDPE (9: 1); cooling at 25 ℃ after 1800s at temperatures of 33.22 ℃, 29.3 ℃, 28.41 ℃ and 27.72 ℃ for Paraffin/HDPE (9:1), PCM10-1, PCM10-3 and PCM10-5, respectively, shows that the addition of EG improves the thermal conductivity and heat transfer rate of the material; the nano phase change heat storage and release material composed of paraffin, HDPE and EG can effectively improve the energy utilization rate.
The differential scanning calorimetry plots of the PCM10-5 prepared in example 1 during different cycles of melting and solidification are shown in fig. 6, where a is melting and b is solidification; the cycle stability of the latent heat of PCM10-5 is shown in fig. 7; fourier infrared spectra of the PCM10-5 at different periods are shown in FIG. 8, and it can be seen from FIGS. 5-7 that the thermal storage of the PCM10-5 prepared in example 1 is not significantly reduced during thermal cycling, and the phase transition temperature is almost unchanged; the amount of heat of melting and solidification after 120 thermal cycles was 92% and 95%, respectively, compared to the initial latent heat of PCM 10-5; the FT-IR spectrum showed no change in the shape and position of the characteristic peaks after 120 cycles, indicating that PCM10-5 was stable and no chemical reaction occurred. Accordingly, the PCM10-5 has excellent thermal reliability and stability, particularly excellent stability in a low-temperature thermal management device, and a long usable time.
The results of the leakage test at 70 ℃ for PCM10-5 prepared in example 1, Paraffin/HDPE (9:1) prepared in comparative example 1, and neat Paraffin wax (Paraffin) are shown in FIG. 9. As can be seen from FIG. 9, the leakage rate of Paraffin/HDPE (9:1) at 70 ℃ limit temperature is about 40%, and the leakage rate of PCM10-5 at 70 ℃ limit temperature is about 30%, indicating that HDPE can improve the permeation resistance of Paraffin wax.
Comparative example 2
A nano phase change heat storage and release material was prepared by the method of example 1, which is different from example 1 in that EG was replaced by Fe3O4(ii) a The thermal conductivity of the nano phase change heat storage and release material is 0.4W/(m.K), wherein Fe3O4The addition amount is 20%, the heat conduction performance is improved by 60% compared with pure paraffin, the latent heat of phase change is 104.5J/g, and the heat loss reaches 30% after 20 times of circulation.
Comparative example 3
The nanometer phase-change heat storage and release material is prepared according to the method of the embodiment 1, and is different from the embodiment 1 in that EG is replaced by 3D graphite, the thermal conductivity of the nanometer phase-change heat storage and release material is 0.617W/(m.K), the latent heat of phase change is 197J/g, and the heat loss reaches 5% after 15 times of circulation;
as can be seen from the example 1 and the comparative examples 2 to 3, the thermal conductivity of EG adopted by the invention is superior to that of ferroferric oxide and 3D graphite as thermal conductive fillers.
Comparative example 4
The PCM2 and PCM3 were prepared according to the method provided by "influence factors of thermal conductivity of Paraffin/high density polyethylene/expanded graphite heat conduction enhanced composite phase change material" (polymer science and engineering, volume 31, phase 5, 2015, pages 83-86), wherein the mass ratio of Paraffin: HDPE: EG in PCM2 is 7:3:0.5, and the mass ratio of Paraffin: HDPE: EG in PCM3 is 7:3: 1.
Compared with pure paraffin, the PCM2 has the advantages that the heat conduction performance is improved by 90.4%, and the heat storage capacity is reduced by 35% compared with pure paraffin.
The latent heat cycle stability results for PCM2 and PCM3 are shown in fig. 10. As can be seen from FIG. 10, after melting and solidification after 120 thermal cycles, the latent heat loss before and after thermal cycles of PCM2 and PCM3 is about 5%, but the latent heat of the composite materials of PCM2 and PCM3 is reduced by more than 40% due to the introduction of HDPE (the initial latent heat of phase change of paraffin is about 230J/g, the latent heat of phase change of PCM2 is about 150J/g, and the latent heat of phase change of PCM3 is about 150.2J/g), and the latent heat loss of example 1 is far less than that of PCM2 and PCM3, which shows that the nano phase change heat storage and release material prepared by the invention has better heat storage performance than that of PCM2 and PCM 3.
Comparative example 5
HDPE/EG/paraffin heat-conducting shape-change phase-change material was prepared according to the method provided in "preparation and performance of HDPE/EG/paraffin heat-conducting shape-change material" (Material engineering, vol.43, No. 4, 2015, pp.42-46), wherein the mass fraction of paraffin was 70%, the mass fractions of EG were 3%, 5% and 7.5% (i.e. the mass ratio of paraffinfin: HDPE: EG: 7:2.7:0.3, 7:2.5:0.5 and 7:2.25:0.75, the latent heat cycle stability of PCM is shown in FIG. 11. from FIG. 11, it can be seen that after melting and solidification after 120 thermal cycles, the mass ratio of paraffinfin: HDPE: EG: 7:2.7:0.3, 7:2.5:0.5 and 7:2.25:0.75, the latent heat loss before and after PCM cycle was approximately within 10%, but the latent heat loss before and after PCM cycle was reduced by more than the initial phase change of HDPE/EG: 2.7: 0.7: 0.5: 0.75 (33 g/PCM) due to the initial phase change of paraffin, the phase change latent heat of the PCM is about 153-158J/g), and the latent heat loss is far greater than that of the example 1, so that the heat storage performance of the nano phase change heat storage and release material prepared by the method is better than that of the PCM prepared by the comparative example.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (7)
1. A nanometer phase change heat storage and release material is characterized by comprising paraffin, high-density polyethylene and expanded graphite;
the mass ratio of the paraffin, the high-density polyethylene and the expanded graphite is 9:1: (0.1-0.7).
2. The method for preparing the nano phase change heat storage and release material as claimed in claim 1, which is characterized by comprising the following steps:
melting paraffin to obtain molten paraffin;
mixing the molten paraffin and the high-density polyethylene powder for the first time to obtain viscous paraffin/high-density polyethylene;
and secondly, mixing the viscous paraffin/high-density polyethylene and the expanded graphite, and cooling to obtain the nano phase-change heat storage and release material.
3. The method according to claim 2, wherein the melting temperature is 45 to 85 ℃.
4. The method according to claim 2, wherein the high-density polyethylene powder has a particle size of 80 to 200 mesh.
5. The method of claim 2, wherein the first mixing is performed at a temperature of 130 to 200 ℃ for 2 to 4 hours.
6. The method of claim 2, wherein the second mixing is carried out at a temperature of 130 to 200 ℃ for 1 to 2 hours.
7. The application of the nanometer phase-change heat-storing and releasing material of claim 1 or the nanometer phase-change heat-storing and releasing material prepared by the preparation method of any one of claims 2 to 6 in solar dry agricultural products or greenhouse heat supply.
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| CN114031957A (en) * | 2021-12-02 | 2022-02-11 | 深圳清华大学研究院 | Preparation method and application of nano graphite powder with heat storage and heat conduction functions |
| CN114031957B (en) * | 2021-12-02 | 2022-11-15 | 深圳清华大学研究院 | Preparation method and application of nano graphite powder with heat storage and heat conduction functions |
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