PCM phase change material and application thereof

Abstract

The invention discloses a PCM (phase change material) and application thereof. The PCM comprises the following components in parts by mass: 10-50 parts of expanded graphite, 10-40 parts of PCM and 20-40 parts of butyl ester or alcohol. The preparation method comprises the following steps: adding ground PCM into butyl ester or alcohol, stirring and melting, forming a PCM solution after the PCM is completely melted, adding expanded graphite into the PCM solution, uniformly mixing, feeding into an oven, heating to volatilize butyl ester or alcohol, pressing and shaping the volatilized semi-solid product, and drying to obtain the product. Forming a film shape; according to the invention, the expanded graphite and the PCM material with similar mass fractions are selected, so that the concentration distribution of the expanded graphite and the PCM material is almost the same, and the situation that the local temperature cannot be quickly dispersed to the whole heat dissipation surface due to poor transverse heat conduction effect caused by too low concentration of the expanded graphite is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field related to PCM phase change materials, and in particular to a PCM phase change material and an application thereof. Background Art

[0002] PCM phase change material refers to a material that can store energy and adjust temperature by utilizing the heat absorption and heat release phenomena of certain substances during the phase change process. The material absorbs and releases a large amount of heat during the phase change process, so that the system temperature is constant at around the phase change temperature for a long time, so as to achieve temperature regulation and control as well as the storage and release of thermal energy. It can effectively utilize thermal energy. Once used, this material can become the best material for energy conservation and environmental protection. The existing PCM phase change material has a better effect of absorbing and releasing heat in the vertical direction. When the heat point is localized and the local temperature is too high, it is difficult for the heat to diffuse horizontally to the PCM phase change material, which results in limited heat dissipation effect and easy heat docking, which leads to heat docking of the heating surface, and is easy to damage the internal electronic devices of the electronic equipment in the electronic equipment. Summary of the invention

[0003] In order to solve the problem in the prior art that the existing PCM phase change material has a good effect of absorbing and releasing heat in the vertical direction, but when the heat point is localized and the local temperature is too high, it is difficult for the heat to diffuse laterally to the PCM phase change material, which leads to limited heat dissipation effect and easy heat docking, which leads to heat docking of the heating surface and easy damage to the internal electronic devices of the electronic equipment, the present invention provides a PCM phase change material and application thereof.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0005] The present invention discloses a PCM phase change material, which comprises the following components by mass fraction: 10-50 parts of expanded graphite, 10-40 parts of PCM, and 20-40 parts of butyl ester or alcohol;

[0006] The preparation process is as follows: add the ground PCM into butyl ester or alcohol, stir and melt, and form a PCM solution after the PCM is completely melted. Add expanded graphite into the PCM solution and mix them until they are evenly mixed. Then, send them into an oven for heating to volatilize the butyl ester or alcohol. Then, press and shape the volatilized semi-solid product to form a film.

[0007] As a preferred technical solution of the present invention, the following components are included in terms of mass fraction: 10-50 parts of expanded graphite, 10-40 parts of PCM, and 20-40 parts of alcohol;

[0008] The preparation process is as follows: add the ground PCM into alcohol and heat it in water at a temperature of 50-60°C to melt it. After the PCM is completely melted, a PCM solution is formed. Add expanded graphite into the PCM solution and mix it. Then, the solution is sent into an oven for heating. The alcohol is volatilized at 50-60°C for 2 hours. Then, the volatilized semi-solid product is pressed and shaped to form a film-like coil.

[0009] As a preferred technical solution of the present invention, the following components are included in terms of mass fraction: 10-50 parts of expanded graphite, 10-40 parts of PCM, and 20-40 parts of butyl ester;

[0010] The preparation process is as follows: adding ground PCM into butyl ester, stirring and melting, forming a PCM solution after the PCM is completely melted, adding expanded graphite into the PCM solution for mixing, and then sending it into an oven for heating, wherein first heating is performed at a heating temperature of 50-70°C for 1 hour, and then heating is performed, and heating is performed at a heating temperature of 120-135°C for 1 hour to volatilize the butyl ester, and then the volatilized semi-solid product is pressed and shaped to form a film-like coil.

[0011] As a preferred technical solution of the present invention, the expanded graphite is expanded at an expansion temperature of 800° C., and the expansion volume is above 260.

[0012] As a preferred technical solution of the present invention, the density of the coiled material is 1.2-1.8, and the thickness of the coiled material is 0.2-2 mm.

[0013] As a preferred technical solution of the present invention, an application of the PCM phase change material as described above in the field of automobile batteries.

[0014] The beneficial effects of the present invention are:

[0015] The PCM phase change material is prepared by dissolving and stirring expanded graphite and PCM material in an organic solvent, butyl ester or alcohol, so that the expanded graphite and PCM material are fully mixed together, so that the expanded graphite is uniform, and then sent into an oven for heating to volatilize the butyl ester or alcohol, and then the volatilized semi-solid product is pressed and shaped to form a film. Since the expanded graphite is obtained by thermal expansion of expandable graphite at high temperature, it has high strength and hardness and excellent thermal conductivity. The expanded graphite has good thermal conductivity in the lateral direction, so that the local temperature can be quickly dispersed to the entire heat dissipation surface, so that it has good heat dissipation efficiency. By selecting expanded graphite and PCM materials with similar mass fractions, the concentration distribution of the expanded graphite and PCM materials is similar, so as to avoid the poor thermal conductivity in the lateral direction due to the low concentration of the expanded graphite, and the inability to quickly disperse the local temperature to the entire heat dissipation surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0017] In the attached picture:

[0018] Figure 1 This is a flow chart of the preparation of a PCM phase change material using alcohol as a solvent;

[0019] Figure 2 This is a flow chart of the preparation of a PCM phase change material using butyl ester as solvent;

[0020] Figure 3 This is a finished product display effect diagram of a PCM phase change material of the present invention. DETAILED DESCRIPTION

[0021] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0022] Embodiment: A PCM phase change material of the present invention comprises the following components by mass fraction: 10-50 parts of expanded graphite, 10-40 parts of PCM, and 20-40 parts of butyl ester or alcohol;

[0023] The preparation process is as follows: add the ground PCM into butyl ester or alcohol, stir and melt, and form a PCM solution after the PCM is completely melted. Add expanded graphite into the PCM solution and mix them until they are evenly mixed. Then, send them into an oven for heating to volatilize the butyl ester or alcohol. Then, press and shape the volatilized semi-solid product to form a film. Expanded graphite and PCM materials are dissolved and stirred in an organic solvent such as butyl ester or alcohol, so that the expanded graphite and PCM materials are fully mixed together to make the expanded graphite uniform, and then sent into an oven for heating to volatilize the butyl ester or alcohol, and then the volatilized semi-solid product is pressed and shaped to form a film. Since the expanded graphite is obtained by thermal expansion of expandable graphite at high temperature, it has high strength and hardness and excellent thermal conductivity. The expanded graphite has good thermal conductivity in the lateral direction, so that the local temperature can be quickly dispersed to the entire heat dissipation surface, which has good heat dissipation efficiency. By selecting expanded graphite and PCM materials with similar mass fractions, the concentration distribution of the expanded graphite and PCM materials is similar, avoiding the poor thermal conductivity in the lateral direction due to the low concentration of the expanded graphite, and the inability to quickly disperse the local temperature to the entire heat dissipation surface.

[0024] Among them, a PCM phase change material includes the following components by mass fraction: 10-50 parts of expanded graphite, 10-40 parts of PCM, and 20-40 parts of alcohol;

[0025] The preparation process is as follows: Figure 1 As shown, the ground PCM is added to alcohol and heated in water at a temperature of 50-60°C to melt. After the PCM is completely melted, a PCM solution is formed. Expanded graphite is added to the PCM solution for mixing, and then sent to an oven for heating. The alcohol is volatilized at 50-60°C for 2 hours, and then the volatilized semi-solid product is pressed and shaped to form a film-like coil. In this scheme, alcohol is used as a solvent for stirring and mixing, which has good stability and does not react with 10-50 parts of expanded graphite and 10-40 parts of PCM. It is easy to heat and volatilize in the subsequent process, and has a wide source, low cost, and is used for subsequent cooling, recycling and reuse.

[0026] The composition includes the following components by mass fraction: 10-50 parts of expanded graphite, 10-40 parts of PCM, and 20-40 parts of butyl ester;

[0027] The preparation process is as follows: Figure 2As shown, the ground PCM is added to the butyl ester, stirred and melted, and a PCM solution is formed after the PCM is completely melted. Expanded graphite is added to the PCM solution for mixing, and then sent to an oven for heating, wherein the butyl ester is first heated at 50-70°C for 1 hour, and then the temperature is increased and heated, and the butyl ester is volatilized at 120-135°C for 1 hour, and then the volatilized semi-solid product is pressed and shaped to form a film-like coil. The butyl ester refers in a broad sense to all compounds generated by the esterification reaction of butanol with carboxylic acid and its derivatives, such as butyl acrylate, dibutyl phthalate, etc., which do not react with 10-50 parts of expanded graphite and 10-40 parts of PCM, and are easily volatilized by subsequent heating, and are widely available, cheap, and used for subsequent cooling and recycling.

[0028] The expanded graphite is expanded at an expansion temperature of 800°C, and the expansion volume is above 260. Transverse heat conduction is carried out through the expanded graphite, wherein the expanded graphite can instantly expand in volume by 150 to 300 times when exposed to high temperature, and changes from flake to worm-like, so that the structure is loose, porous and curved, the surface area is enlarged, the surface energy is improved, the adsorption force of flake graphite is enhanced, and the worm-like graphite can be self-interlocked, thus increasing its softness, resilience and plasticity. In addition to the excellent properties of natural graphite itself such as resistance to cold and heat, corrosion resistance, and self-lubrication, it also has the characteristics of softness, compression resilience, adsorption, ecological environment coordination, biocompatibility, radiation resistance, etc. that natural graphite does not have.

[0029] The density of the coil is 1.2-1.8, the thickness of the coil is 0.2-2mm, and the finished product effect is as shown in the figure Figure 3 shown.

[0030] Among them, one application of the above-mentioned PCM phase change material in the field of automobile batteries is to be set on the battery pack to dissipate heat, thus ensuring that the battery pack has a better heat dissipation effect.

[0031] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A PCM phase change material, characterized in that: The components include the following in terms of mass fraction: 10-50 parts of expanded graphite, 10-40 parts of PCM, and 20-40 parts of butyl ester or alcohol; The preparation process is as follows: add the ground PCM into butyl ester or alcohol, stir and melt, and form a PCM solution after the PCM is completely melted. Add expanded graphite into the PCM solution and mix them until they are evenly mixed. Then, send them into an oven for heating to volatilize the butyl ester or alcohol. Then, press and shape the volatilized semi-solid product to form a film.

2. A PCM phase change material according to claim 1, characterized in that: The components include the following in terms of mass fraction: 10-50 parts of expanded graphite, 10-40 parts of PCM, and 20-40 parts of alcohol; The preparation process is as follows: add the ground PCM into alcohol and heat it in water at a temperature of 50-60°C to melt it. After the PCM is completely melted, a PCM solution is formed. Add expanded graphite into the PCM solution and mix it. Then, the solution is sent into an oven for heating. The alcohol is volatilized at 50-60°C for 2 hours. Then, the volatilized semi-solid product is pressed and shaped to form a film-like coil.

3. The PCM phase change material according to claim 1, characterized in that: The components include the following in terms of mass fraction: 10-50 parts of expanded graphite, 10-40 parts of PCM, and 20-40 parts of butyl ester; The preparation process is as follows: adding ground PCM into butyl ester, stirring and melting, forming a PCM solution after the PCM is completely melted, adding expanded graphite into the PCM solution for mixing, and then sending it into an oven for heating, wherein first heating is performed at a heating temperature of 50-70°C for 1 hour, and then heating is performed, and heating is performed at a heating temperature of 120-135°C for 1 hour to volatilize the butyl ester, and then the volatilized semi-solid product is pressed and shaped to form a film-like coil.

4. A PCM phase change material according to claims 1-3, characterized in that: The expanded graphite is expanded at an expansion temperature of 800° C., and the expansion volume is above 260.

5. The PCM phase change material according to claim 1, characterized in that: The density of the coil is 1.2-1.8, and the thickness of the coil is 0.2-2 mm.

6. Application of the PCM phase change material according to any one of claims 1 to 5 in the field of automotive batteries.

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