Solid-solid composite phase change heat storage material and preparation method thereof
By using composite materials of 1,10-decanediol, expanded graphite and flake graphene, the existing solid-solid phase change heat storage materials are solved, and the high-efficiency heat storage and heat conduction performance of the material is improved.
Patent Information
- Application Number
- CN202510254615.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-05
- Publication Date
- 2025-06-06
AI Technical Summary
Existing solid-solid phase change heat storage materials are difficult to meet the requirements of phase change temperature and phase change enthalpy.
The composite material of 1,10-decanediol, expanded graphite and flake graphene were prepared by mechanical stirring and vacuum drying, and the phase change temperature and phase change enthalpy of the material were adjusted.
While maintaining a higher phase change enthalpy, the phase change temperature of the material is adjusted to a more ideal range, the heat storage capacity and heat conduction performance are improved, and the adaptability and thermal energy utilization efficiency of the material are enhanced.
Smart Images
Figure CN120098608A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of thermal management materials, and in particular to a solid-solid composite phase-change heat storage material and a preparation method thereof. Background Art
[0002] When electronic devices are used in high-power or high-temperature environments, they will generate a large amount of heat in a short period of time. If the heat cannot be discharged in time, it will affect the normal operation and function of the equipment. When used in low-power or low-temperature environments, if the operating temperature of the equipment is too low, the overall performance of the equipment will decline and the response will be slow. The working principle of solid-solid phase change heat storage materials is that when the ambient temperature rises or drops to the phase change temperature, this material will absorb or release heat from the environment to undergo a phase change, achieve heat storage and release, keep the temperature of the electronic equipment within a certain temperature range, maintain the normal operation and function of the equipment, and improve its reliability.
[0003] At present, when the phase change temperature is in the range of 70 to 80°C, the phase change enthalpy is generally lower than 220 J / g; when the phase change enthalpy is higher than 250 J / g, the phase change temperature is too high and the density is too large; therefore, the existing solid-solid phase change heat storage materials are difficult to meet the requirements of phase change temperature and phase change enthalpy at the same time. Summary of the invention
[0004] The object of the present invention is to provide a solid-solid composite phase change heat storage material and a preparation method thereof, aiming to solve the technical problem that the solid-solid phase change heat storage material in the prior art is difficult to simultaneously meet the requirements of phase change temperature and phase change enthalpy.
[0005] To achieve the above-mentioned purpose, the present invention adopts a solid-solid composite phase change heat storage material, which includes an A component and a B component.
[0006] The solid-solid composite phase change heat storage material further comprises a C component, the A component is 1,10-decanediol, the B component is expanded graphite, the C component is flaky graphene, and the contents of the A component, the B component and the C component are 80-90%, 12-15% and 2-5% respectively.
[0007] The purity of the 1,10-decanediol is 98%, the purity of the expanded graphite is greater than 90%, and the purity of the flaky graphene is greater than 90%.
[0008] The component A is 1,10-decanediol, the component B is expanded graphite, and the contents of the component A and the component B are 80-85% and 15-20% respectively.
[0009] The purity of the 1,10-decanediol is 98%, and the purity of the expanded graphite is greater than 90%.
[0010] The component A is 1,10-decanediol, the component B is trishydroxymethylaminomethane, and the contents of the component A and the component B are 96-99.5% and 0.5-4% respectively.
[0011] The purity of the 1,10-decanediol is 98%, and the purity of the tris(hydroxymethyl)aminomethane is 98%.
[0012] The present invention also provides a method for preparing a solid-solid composite phase change heat storage material, which is used to prepare the solid-solid composite phase change heat storage material as described above.
[0013] The steps include:
[0014] First, take each component in proportion and add it into a stainless steel barrel;
[0015] Use a stainless steel rotor to perform mechanical stirring for 2-4 hours to mix the components evenly to obtain a mixture for later use;
[0016] The mixture is placed in a vacuum drying oven at 80-170°C for 1-48 hours for drying;
[0017] After drying, cool to room temperature under vacuum and break the vacuum, take out the powder and sieve it with a 40-200 mesh sieve;
[0018] The sieved powder is placed in a mold for pressing to obtain a solid-solid composite phase change heat storage material.
[0019] The stainless steel rotor is used for mechanical stirring for 2-4 hours to evenly mix the components to obtain a mixture for standby use: the stirring speed is 300-500 rpm.
[0020] The present invention discloses a solid-solid composite phase-change heat storage material and a preparation method thereof. By selecting 1,10-decanediol as the main phase-change material and combining the synergistic effect of expanded graphite and flake graphene, the present invention successfully adjusts the phase-change temperature of the material to a more ideal range while maintaining a relatively high phase-change enthalpy. This not only improves the heat storage capacity of the material, but also broadens its adaptability in practical applications, such as being suitable for heat storage and release under different climatic conditions.
[0021] At the same time, the introduction of expanded graphite and flake graphene, especially the ratio of 12-15% expanded graphite and 2-5% flake graphene, greatly enhances the thermal conductivity of the material, which not only accelerates the heat absorption and release process, improves the response speed of the heat storage material, but also helps to reduce the loss in the process of heat energy transfer, thereby improving the overall thermal energy utilization efficiency. The selected 1,10-decanediol, expanded graphite and flake graphene are all environmentally friendly materials, non-toxic and harmless, and easy to recycle, which is in line with the current green and low-carbon development trend. In this way, the technical problem that the solid-solid phase change heat storage material in the prior art is difficult to simultaneously meet the requirements of phase change temperature and phase change enthalpy is solved. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0023] Figure 1 is a DSC curve diagram of the sample in the first embodiment of the present invention.
[0024] Figure 2 is a DSC curve diagram of the sample in the second embodiment of the present invention.
[0025] Figure 3 is a DSC curve chart of sample 1 in the third embodiment of the present invention.
[0026] Figure 4 is a DSC curve chart of sample 2 in the third embodiment of the present invention.
[0027] Figure 5 is a DSC curve chart of sample 3 in the third embodiment of the present invention. DETAILED DESCRIPTION
[0028] Embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, but should not be construed as limiting the present invention.
[0029] The first embodiment of the present application is:
[0030] See also Figure 1 , Figure 1 is a DSC curve diagram of the sample in the first embodiment of the present invention.
[0031] The present invention provides a solid-solid composite phase-change heat storage material, comprising a component A, a component B and a component C, wherein the component A is 1,10-decanediol, the component B is expanded graphite, the component C is flaky graphene, and the contents of the component A, the component B and the component C are 80-90%, 12-15% and 2-5%, respectively.
[0032] The purity of the 1,10-decanediol is 98%, the purity of the expanded graphite is greater than 90%, and the purity of the flaky graphene is greater than 90%.
[0033] In this embodiment, the preparation method of the solid-solid composite phase change thermal storage material comprises the following steps:
[0034] S1. First, add 85% of 1,10-decanediol, 12.6% of expanded graphite and 2.4% of flake graphene into a stainless steel barrel;
[0035] S2, then use a stainless steel rotor to perform mechanical stirring for 2-3 hours to mix the components evenly to obtain a mixture for standby use (stirring speed 300-500 rpm);
[0036] S3, placing the mixture in a vacuum drying oven at 80-90°C for 1-48h to dry;
[0037] S4, after drying, cool to room temperature under vacuum and break the vacuum, take out the powder and sieve it with a 80-200 mesh sieve;
[0038] S5. Take 0.25g of the sieved powder and place it in a mold for pressing to obtain a 10×10×1.5mm solid-solid composite phase change thermal storage material. (Pressing conditions: (2-10MPa, room temperature -60°C, pressure maintenance for 5-10min).
[0039] For this embodiment, the prepared solid-solid phase change heat storage block material has a density of 1.14 g cm-3, a thermal conductivity of 5.29 Wm-1 K-1, a phase change temperature of 75.45°C, and a phase change enthalpy of 216.43 J / g.
[0040] The second embodiment of the present application is:
[0041] See also Figure 2 , Figure 2 is a DSC curve diagram of the sample in the second embodiment of the present invention.
[0042] The invention provides a solid-solid composite phase-change heat storage material, comprising component A and component B, wherein the component A is 1,10-decanediol, the component B is expanded graphite, and the contents of the component A and the component B are 80-85% and 15-20% respectively.
[0043] The purity of the 1,10-decanediol is 98%, and the purity of the expanded graphite is greater than 90%.
[0044] In this embodiment, the preparation method of the solid-solid composite phase change thermal storage material comprises the following steps:
[0045] S1. First, add 85% of 1,10-decanediol and 15% of expanded graphite into a stainless steel barrel;
[0046] S2, then use a stainless steel rotor to perform mechanical stirring for 2-3 hours to mix the components evenly to obtain a mixture for standby use (stirring speed 300-500 rpm);
[0047] S3, placing the mixture in a vacuum drying oven at 80-90°C for 1-48h to dry;
[0048] S4, after drying, cool to room temperature under vacuum and break the vacuum, take out the powder and sieve it with a 80-200 mesh sieve;
[0049] S5. Take 0.25g of the sieved powder and place it in a mold for pressing to obtain a 10×10×1.5mm solid-solid composite phase change thermal storage material. (Pressing conditions: (2-10MPa, room temperature -60°C, pressure maintenance for 5-10min).
[0050] For this embodiment, the thermal conductivity of the prepared solid-solid phase change heat storage block material is 7.20 W m-1K-1, the phase change temperature is 73.74°C, and the phase change enthalpy is 216.66 J / g.
[0051] The third embodiment of the present application is:
[0052] See also Figure 3 to Figure 5 , Figure 3 is a DSC curve chart of sample 1 in the third embodiment of the present invention. Figure 4 is a DSC curve chart of sample 2 in the third embodiment of the present invention. Figure 5 is a DSC curve chart of sample 3 in the third embodiment of the present invention.
[0053] The invention provides a solid-solid composite phase-change heat storage material, comprising component A and component B, wherein the component A is 1,10-decanediol, the component B is trishydroxymethylaminomethane, and the contents of the component A and the component B are 96-99.5% and 0.5-4% respectively.
[0054] The purity of the 1,10-decanediol is 98%, and the purity of the tris(hydroxymethyl)aminomethane is 98%.
[0055] In this embodiment, the preparation method of the solid-solid composite phase change thermal storage material comprises the following steps:
[0056] S1. First, add 96-99.5% of 1,10-decanediol and 0.5-4% of tris(hydroxymethyl)aminomethane into a stainless steel barrel;
[0057] S2, then use a stainless steel rotor to perform mechanical stirring for 2-4 hours to mix the components evenly to obtain a mixture for standby use (stirring speed 300-400 rpm);
[0058] S3, placing the mixture in a vacuum drying oven at 170°C for 1-48 hours for drying. When the two polyols are melted and are in liquid state, immediately cut off the power supply to complete the drying;
[0059] S4, after drying, cool to room temperature under vacuum and then break the vacuum, take out the powder and sieve it with a 40-100 mesh sieve;
[0060] S5. The sieved powder is placed in a mold for pressing to obtain a solid-solid composite phase change thermal storage material. (Pressing conditions: (10MPa, room temperature -60°C, pressure maintenance for 10min).
[0061] For this embodiment, a differential thermal analyzer and a specific gravity balance were used to test the thermal properties such as phase change enthalpy, phase change temperature, thermal conductivity, specific heat capacity and density. The test results are shown in Table 1:
[0062] Table 1 Thermal properties and density of composite phase change materials with different compositions
[0063]
[0064] In summary, the phase change temperature of the solid-solid phase change heat storage composite material of the third embodiment is: 73-75°C, phase change enthalpy: 265-275 J / g, thermal conductivity: about 0.5 Wm-1 K-1, specific heat capacity: 1.65-1.95 J g-1, density: 1.0-1.1 g / cm3
[0065] The solid-solid composite phase change heat storage material and the preparation method thereof of the present invention are used. By selecting 1,10-decanediol as the main phase change material and combining the synergistic effect of expanded graphite and flake graphene, the present invention successfully adjusts the phase change temperature of the material to a more ideal range while maintaining a relatively high phase change enthalpy; not only the heat storage capacity of the material is improved, but also its adaptability in practical applications is broadened, such as being suitable for heat storage and release under different climatic conditions;
[0066] At the same time, the introduction of expanded graphite and flake graphene, especially the ratio of 12-15% expanded graphite and 2-5% flake graphene, greatly enhances the thermal conductivity of the material, which not only accelerates the heat absorption and release process, improves the response speed of the heat storage material, but also helps to reduce the loss in the process of heat energy transfer, thereby improving the overall thermal energy utilization efficiency. The selected 1,10-decanediol, expanded graphite and flake graphene are all environmentally friendly materials, non-toxic and harmless, and easy to recycle, which is in line with the current green and low-carbon development trend. In this way, the technical problem that the solid-solid phase change heat storage material in the prior art is difficult to simultaneously meet the requirements of phase change temperature and phase change enthalpy is solved.
[0067] What is disclosed above is only a preferred embodiment of the present invention, and it certainly cannot be used to limit the scope of rights of the present invention. Ordinary technicians in this field can understand that all or part of the processes of the above embodiment and equivalent changes made according to the claims of the present invention still fall within the scope of the invention.
Claims
1. A solid-solid composite phase change heat storage material, characterized in that: It includes component A and component B.
2. The solid-solid composite phase change heat storage material according to claim 1, characterized in that: The solid-solid composite phase change heat storage material also includes a C component, the A component is 1,10-decanediol, the B component is expanded graphite, the C component is flaky graphene, and the contents of the A component, the B component and the C component are 80-90%, 12-15% and 2-5% respectively.
3. The solid-solid composite phase change heat storage material according to claim 2, characterized in that: The purity of the 1,10-decanediol is 98%, the purity of the expanded graphite is greater than 90%, and the purity of the flaky graphene is greater than 90%.
4. The solid-solid composite phase change heat storage material according to claim 1, characterized in that: The component A is 1,10-decanediol, the component B is expanded graphite, and the contents of the component A and the component B are 80-85% and 15-20% respectively.
5. The solid-solid composite phase change heat storage material according to claim 4, characterized in that: The purity of the 1,10-decanediol is 98%, and the purity of the expanded graphite is greater than 90%.
6. The solid-solid composite phase change heat storage material according to claim 1, characterized in that: The component A is 1,10-decanediol, the component B is trishydroxymethylaminomethane, and the contents of the component A and the component B are 96-99.5% and 0.5-4% respectively.
7. The solid-solid composite phase change heat storage material according to claim 6, characterized in that: The purity of the 1,10-decanediol is 98%, and the purity of the tris(hydroxymethyl)aminomethane is 98%.
8. A method for preparing a solid-solid composite phase change heat storage material, used for preparing the solid-solid composite phase change heat storage material as claimed in claim 1, characterized in that: The steps include: First, take each component in proportion and add it into a stainless steel barrel; Use a stainless steel rotor to perform mechanical stirring for 2-4 hours to mix the components evenly to obtain a mixture for later use; The mixture is placed in a vacuum drying oven at 80-170°C for 1-48 hours for drying; After drying, cool to room temperature under vacuum and break the vacuum, take out the powder and sieve it with a 40-200 mesh sieve; The sieved powder is placed in a mold for pressing to obtain a solid-solid composite phase change heat storage material.
9. The method for preparing the solid-solid composite phase change thermal storage material according to claim 8, characterized in that: A stainless steel rotor is used for mechanical stirring for 2-4 hours to evenly mix the components to obtain a mixture for standby use: the stirring speed is 300-500 rpm.