Multi-layer flexible phase change material with high enthalpy value and high thermal conductivity and preparation method of multi-layer flexible phase change material

Abstract

The invention relates to the technical field of preparation of flexible phase change materials, in particular to a multi-layer flexible phase change material with a high enthalpy value and high thermal conductivity and a preparation method of the multi-layer flexible phase change material with the high enthalpy value and the high thermal conductivity. Adding a linear triblock copolymer into the liquid paraffin, stirring at constant temperature to obtain a first mixture, and pressing the first mixture into a film form by using a press machine to obtain a first film; adding expanded graphite powder into the first mixture in the constant-temperature state at a constant speed, continuously stirring until uniform mixing to obtain a second mixture, and pressing the second mixture into a film form by using a press machine to obtain a second film; the thin films are stacked and placed on an intelligent temperature control electric heating plate, and the thin films are bonded with one another through the viscosity of the thin films to obtain a blocky object; and cutting the alternately stacked and bonded blocky objects along the direction parallel to the stacking direction to obtain the multi-layer flexible phase change material with high enthalpy value and high thermal conductivity.

Description

Technical Field

[0001] The present invention relates to the technical field of flexible phase change materials, and in particular to a multilayer flexible phase change material with high enthalpy value and high thermal conductivity and a preparation method thereof. Background Art

[0002] Phase change materials (PCMs) have attracted widespread attention due to their ability to absorb or release a large amount of latent heat during phase change. In the field of energy storage and utilization, they are regarded as an efficient thermal energy storage medium, and have great potential for solving the mismatch between energy supply and demand in time and space. Traditional PCMs, such as many organic PCMs (represented by paraffin), have high enthalpy values ​​and can store a large amount of heat, but their thermal conductivity is low. This results in slow heat transfer during the absorption and release of heat, making the phase change process not fast enough, limiting its application in scenarios that require rapid thermal response.

[0003] Chinese patent application publication number: CN109686840A discloses a flexible multi-layer composite GeTe / ZnSb phase change thin film material and a preparation method thereof. The thin film material is composited by alternating deposition of GeTe thin film layers and ZnSb thin film layers, wherein the thickness of the GeTe thin film layer is 1-10nm, the thickness of the ZnSb thin film layer is 1-10nm, and the total thickness of the GeTe / ZnSb phase change thin film material is 40-60nm. The thin film material prepared by the invention has good thermal stability and low power consumption, and is an ideal phase change storage material.

[0004] It can be seen that the prior art has the problem of inaccurate analysis of the flexible phase change material stacking process, resulting in low performance of the stacked flexible phase change material. Summary of the invention

[0005] To this end, the present invention provides a multilayer flexible phase change material with high enthalpy value and high thermal conductivity and a preparation method thereof, so as to overcome the problem in the prior art that the analysis of the stacking process of the flexible phase change material is not accurate enough, resulting in low performance of the stacked flexible phase change material.

[0006] To achieve the above object, the present invention provides a method for preparing a multilayer flexible phase change material with high enthalpy value and high thermal conductivity, comprising:

[0007] Heating paraffin wax at a preset melting temperature to obtain liquid paraffin wax, adding a linear triblock copolymer to the liquid paraffin wax and stirring the mixture at a constant temperature to obtain a first mixture, and pressing the first mixture into a film form using a press to obtain a first film;

[0008] Adding expanded graphite powder to the first mixture at a constant temperature at a uniform speed, and continuously stirring until the mixture is uniformly mixed to obtain a second mixture, and pressing the second mixture into a film form using a press to obtain a second film;

[0009] The first film, the second film, and the first film are stacked in order, and then placed on an intelligent temperature-controlled electric heating plate, and the films are bonded to each other by their own viscosity to obtain a block object;

[0010] When stacking films, determining whether to process the film based on the area ratio of wrinkles or bubbles on the topmost film when the films are stacked in single layers, and under the condition of determining that the film is to be processed, determining whether to replace the corresponding type of film, or to cut off the wrinkled or bubbled film, or making a secondary determination on the processing method of the film to be processed, based on whether the location where wrinkles or bubbles appear on the film to be processed is in the central area, and whether there is a film below the film to be processed that needs to be processed by cutting off wrinkles or bubbles, and the processing method includes replacing the corresponding type of film or cutting off wrinkles or bubbles;

[0011] When the treatment method of the film to be treated is secondarily determined, it is determined to replace the corresponding type of film or to cut off the film with wrinkles or bubbles according to the mapped overlap area of ​​the lower film of the film to be treated with the film having wrinkles or bubbles cut off;

[0012] The block objects that are alternately stacked and bonded are cut along a direction parallel to the stacking direction to obtain a multilayer flexible phase change material with high enthalpy value and high thermal conductivity.

[0013] Further, the determining whether to process the film includes:

[0014] If the area ratio of wrinkles or bubbles in the topmost film when the films are stacked in single layers is greater than or equal to the preset area ratio, it is determined that the film needs to be processed.

[0015] Further, under the condition of determining to process the film, the determination of replacing the corresponding type of film, cutting off the film with wrinkles or bubbles, or performing a secondary determination on the processing method of the film to be processed includes:

[0016] If the location where wrinkles or bubbles appear on the film to be treated is in the central area, or the lower film of the film to be treated does not have a film treatment in which wrinkles or bubbles are removed and the locations where wrinkles or bubbles appear on the film to be treated are unevenly distributed, it is determined to replace the corresponding type of film;

[0017] If the lower film of the film to be treated does not have a film to be treated by cutting out wrinkles or bubbles and the locations of wrinkles or bubbles in the film to be treated are evenly distributed, it is determined to cut out the film with wrinkles or bubbles;

[0018] If the location where wrinkles or bubbles appear on the film to be processed is not in the central area and the underlying film of the film to be processed has a portion of the film with wrinkles or bubbles cut off, a secondary determination is made on the processing method of the film to be processed.

[0019] Further, the second determination of the treatment method of the film to be treated includes:

[0020] If the mapping overlap area ratio of the lower film processed by cutting out the wrinkled or bubbled part of the film is less than the preset area ratio, it is determined to cut out the wrinkled or bubbled part of the film;

[0021] If the mapping overlap area ratio of the lower film processed by removing wrinkles or bubbles is greater than or equal to the preset area ratio, it is determined to replace the corresponding type of film.

[0022] Furthermore, the mapping overlap area ratio of the lower film that has been treated with the removal of wrinkles or bubbles is the ratio of the sum of the area of ​​the film to be treated with wrinkles or bubbles removed mapped to the lower film and the area of ​​the lower film with wrinkles or bubbles removed to the face value of the lower film, and the overlapping area of ​​the film to be treated with the area of ​​the film to be treated with wrinkles or bubbles removed mapped to the lower film and the area of ​​the lower film with wrinkles or bubbles removed does not need to be calculated repeatedly.

[0023] Further, judging whether the location where wrinkles or bubbles appear in the film to be processed is in the central area includes:

[0024] Based on the shape of the film to be processed and determining the geometric center;

[0025] Taking the geometric center as the origin, divide the area with the same shape as the film to be processed as the central area range, and the area of ​​the central area range is set to four fifths of the area of ​​the film to be processed;

[0026] Use a marking tool to record where wrinkles or bubbles are;

[0027] The position of the marked wrinkles or bubbles is compared with the previously divided central area range to determine whether it is in the central area.

[0028] Further, judging that the locations where wrinkles or bubbles appear in the film to be processed are evenly distributed includes determining that the locations where wrinkles or bubbles appear in the film to be processed are evenly distributed when a maximum distance between wrinkles or bubbles appearing in the film to be processed is less than a preset distance.

[0029] Furthermore, the preset distance is determined according to the diagonal distance of the film to be processed.

[0030] Furthermore, when the first film, the second film, and the first film are stacked in sequence, they are placed in a relatively closed space or a wind shield device is used to reduce air flow.

[0031] A multilayer flexible phase change material with high enthalpy and high thermal conductivity obtained by the method for preparing the multilayer flexible phase change material with high enthalpy and high thermal conductivity, comprising: the mass parts of the components of the multilayer flexible phase change material with high enthalpy and high thermal conductivity are 76 to 80 parts of paraffin, 19 to 20 parts of linear tri-embedded copolymer and 0 to 6 parts of expanded graphite.

[0032] Compared with the prior art, the beneficial effect of the present invention lies in that the present invention determines whether to process the film by comparing the area ratio of wrinkles or bubbles on the top film with the preset area ratio, and can clearly quantify the quality standard of the film. When the area ratio is greater than or equal to the preset area ratio, it is processed, and when it is less than the preset area ratio, it is not processed. This clear judgment standard helps to ensure the quality stability of the final product. For example, in actual production, it can avoid the problem of uneven product performance due to unclear quality standards, so that each batch of multi-layer flexible phase change materials can be at a relatively consistent quality level. For multi-layer flexible phase change materials, wrinkles or bubbles on the surface of the film may affect the thermal conductivity, mechanical strength and overall reliability of the material. Through this precise judgment and processing method, defects that may have a greater impact on product performance can be discovered and processed in time, reducing the risk of product failure during use. Through the above process, the accuracy of the analysis of the stacking process of flexible phase change materials is improved, thereby improving the performance of the stacked flexible phase change materials.

[0033] Furthermore, the present invention determines a specific treatment method according to the location of wrinkles or bubbles in the film to be treated and the treatment of the lower film, which can solve the film quality problem more specifically. If the wrinkles or bubbles are located in the central area, or the location distribution is uneven and the lower film has not been treated, directly replacing the corresponding type of film can ensure the stability of the quality of the core area of ​​the material and avoid affecting the overall performance due to local defects. For example, in a multi-layer flexible phase change material, the quality problem in the central area may have a greater negative impact on key performances such as heat conduction and energy storage. Timely replacement of the film can effectively guarantee these performances. For the case where the lower film is not treated and the wrinkles or bubbles are evenly distributed, the wrinkled or bubble part of the film is selected to be cut off. The integrity and performance of the material can be maintained without wasting a lot of material. This treatment method not only solves the problem of local defects, but also reduces the cost and resource waste caused by replacing the entire film. At the same time, a secondary judgment is made for specific situations, and the treatment method can be determined more accurately, further improving product quality and performance. The above process improves the accuracy of the analysis of the stacking process of the flexible phase change material and thus improves the performance of the stacked flexible phase change material.

[0034] Furthermore, the present invention determines the final processing method by comparing the percentage of the mapped overlapping area of ​​the lower film processed with the removed wrinkled or bubbled part with the preset area percentage, so that the processing of the problematic film is more accurate. This secondary judgment mechanism can select the most appropriate processing method according to the specific defect situation under complex production conditions, avoiding the problem of over-processing or under-processing that may be caused by a single processing method, thereby effectively improving the quality of the product. For example, if the processing method is determined based on only one judgment, the severity of the problem may be misjudged in some cases, resulting in unnecessary material waste or product quality degradation, while the secondary judgment can be more accurate. Accurately evaluate the problem and ensure the stability of product performance. The calculation method for the percentage of mapped overlapping area of ​​the lower film treated with the removed wrinkles or bubbles is clarified, providing a scientific basis for judgment. This calculation method takes into account the relationship between the film to be treated and the lower film, and can more comprehensively evaluate the severity of the problem. For example, by calculating the percentage of overlapping area, it can be determined whether the problem is concentrated in a specific area or has spread to a larger area, thereby providing an accurate reference for choosing whether to remove part of the film or replace the entire film. The above process improves the accuracy of the analysis of the stacking process of flexible phase change materials and thus improves the performance of the stacked flexible phase change materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 The flowchart is a method for preparing a multilayer flexible phase change material with high enthalpy and high thermal conductivity according to an embodiment of the present invention;

[0036] Figure 2 This is a flowchart for determining whether the location where wrinkles or bubbles appear in a film to be treated is in the central area in the method for preparing a multilayer flexible phase change material with high enthalpy and high thermal conductivity according to an embodiment of the present invention;

[0037] Figure 3 The present invention is a flowchart for determining whether to process a film in a method for preparing a multilayer flexible phase change material with high enthalpy and high thermal conductivity according to an embodiment of the present invention. DETAILED DESCRIPTION

[0038] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0039] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0040] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0041] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] See also Figure 1-Figure 3 As shown, Figure 1 The flowchart is a method for preparing a multilayer flexible phase change material with high enthalpy and high thermal conductivity according to an embodiment of the present invention; Figure 2 This is a flowchart for determining whether the location where wrinkles or bubbles appear in a film to be treated is in the central area in the method for preparing a multilayer flexible phase change material with high enthalpy and high thermal conductivity according to an embodiment of the present invention; Figure 3 The present invention is a flowchart for determining whether to process a film in a method for preparing a multilayer flexible phase change material with high enthalpy and high thermal conductivity according to an embodiment of the present invention.

[0043] The method for preparing a multilayer flexible phase change material with high enthalpy and high thermal conductivity according to an embodiment of the present invention comprises:

[0044] Step S1, heating the paraffin wax at a preset melting temperature to obtain liquid paraffin wax, adding a linear triblock copolymer to the liquid paraffin wax and stirring the mixture at a constant temperature to obtain a first mixture, and pressing the first mixture into a film form using a press to obtain a first film;

[0045] Step S2, adding expanded graphite powder to the first mixture in a constant temperature state at a uniform speed, and continuously stirring until the mixture is uniformly mixed to obtain a second mixture, and pressing the second mixture into a film form using a press to obtain a second film;

[0046] Step S3, stacking the first film, the second film, and the first film in order, and then placing them on an intelligent temperature-controlled electric heating plate, and bonding them to each other by virtue of their own viscosity to obtain a block object;

[0047] Step S4, when stacking films, determining whether to process the film based on the area ratio of wrinkles or bubbles on the topmost film when the films are stacked in single layers, and under the condition of determining that the film is to be processed, determining whether to replace the corresponding type of film, or to cut off the wrinkled or bubbled film, or making a secondary determination on the processing method of the film to be processed, based on whether the location where wrinkles or bubbles appear on the film to be processed is in the central area, and whether there is a film below the film to be processed that has wrinkles or bubbles cut off;

[0048] Step S5, when the treatment method of the film to be treated is secondarily determined, according to the mapped overlap area of ​​the lower film of the film to be treated where the wrinkled or bubbled part is removed, it is determined whether to replace the corresponding type of film or to remove the wrinkled or bubbled part of the film;

[0049] Step S6, cutting the block objects that have been alternately stacked and bonded together along a direction parallel to the stacking direction to obtain a multilayer flexible phase change material with high enthalpy value and high thermal conductivity.

[0050] In the embodiment of the present invention, the preset melting temperature is set to 70°C, the heating time is 10 minutes, the stirring temperature in step S2 is 130°C; and the mass fraction ratio of the added paraffin wax to the linear triblock copolymer is 4:1, the temperature of the temperature-controlled electric heating plate in step S3 is 60°C, and the standing time is 5 minutes.

[0051] In the embodiment of the present invention, 94 parts of a homogeneous mixture of paraffin wax and a linear triblock copolymer were taken out, 6 parts of expanded graphite were added thereto, and constant temperature and constant speed stirring was continued for 10 minutes, the oil bath temperature of the magnetic stirrer was 130° C., the stirring speed was 60 revolutions per minute, and the paraffin wax, the linear triblock copolymer and the expanded graphite film were obtained by pressing; 100 parts of a homogeneous mixture of paraffin wax and the linear triblock copolymer were taken out, and the paraffin wax and the linear triblock copolymer film were obtained by pressing, and the two films were alternately stacked and placed on a 60° C. intelligent temperature-controlled electric heating plate, and the standing time was 2 hours. The temperature is set to 5 minutes, so that the paraffin, linear tri-embedded copolymer and expanded graphite film and the paraffin in the paraffin and linear tri-embedded copolymer film complete the phase change, so that they can be bonded by their own viscosity; the blocks of the paraffin and linear tri-embedded copolymer film and the paraffin, linear tri-embedded copolymer and expanded graphite film alternately stacked in sequence are cut along a direction parallel to the stacking direction to obtain a multilayer flexible phase change material with high enthalpy value and high thermal conductivity, named 0EG@6EG-1; preferably, the thickness of 100 parts of the material is 1 mm.

[0052] Specifically, in step S4, when determining whether to process the film, it is determined whether to process the film based on a comparison result of the area ratio of wrinkles or bubbles on the topmost film when the films are stacked in single layers and a preset area ratio;

[0053] When the area ratio of wrinkles or bubbles on the topmost film of a single-layer stacked film is greater than or equal to a preset area ratio, it is determined that the film needs to be processed;

[0054] When the area ratio of wrinkles or bubbles on the topmost film in a single-layer stacked film is less than a preset area ratio, it is determined that the film does not need to be processed;

[0055] Among them, the value range of the preset area ratio is set to 0.01, but the above value is not limited to this, and technical personnel in this field can also adjust the value according to actual needs.

[0056] The present invention determines whether to process the film by comparing the area ratio of wrinkles or bubbles on the top film with a preset area ratio, and can clearly quantify the quality standard of the film. When the area ratio is greater than or equal to the preset area ratio, it is processed, and when it is less than the preset area ratio, it is not processed. This clear judgment standard helps to ensure the quality stability of the final product. For example, in actual production, it can avoid the problem of uneven product performance due to unclear quality standards, so that each batch of multi-layer flexible phase change materials can be at a relatively consistent quality level. For multi-layer flexible phase change materials, wrinkles or bubbles on the surface of the film may affect the thermal conductivity, mechanical strength and overall reliability of the material. Through this precise judgment and processing method, defects that may have a greater impact on product performance can be discovered and processed in time, reducing the risk of product failure during use. Through the above process, the accuracy of the analysis of the flexible phase change material stacking process is improved, thereby improving the performance of the stacked flexible phase change material.

[0057] Specifically, in step S4, when it is determined to replace the corresponding type of film, cut off the wrinkled or bubbled film, or perform a secondary determination on the treatment method of the film to be treated, it is determined to replace the corresponding type of film, cut off the wrinkled or bubbled film, or perform a secondary determination on the treatment method of the film to be treated, based on whether the position where the wrinkles or bubbles appear in the film to be treated is in the central area, and whether the lower film of the film to be treated has the wrinkles or bubbled film cut off, it is determined to replace the corresponding type of film, cut off the wrinkled or bubbled film, or perform a secondary determination on the treatment method of the film to be treated;

[0058] When the position where wrinkles or bubbles appear on the film to be treated is in the central area, or the lower film of the film to be treated does not have a film treatment in which wrinkles or bubbles are cut off and the positions where wrinkles or bubbles appear on the film to be treated are unevenly distributed, it is determined to replace the corresponding type of film;

[0059] When the lower film of the film to be processed does not have a film to be processed by cutting out wrinkles or bubbles and the positions of wrinkles or bubbles in the film to be processed are evenly distributed, it is determined to cut out the film with wrinkles or bubbles;

[0060] When the position where wrinkles or bubbles appear on the film to be processed is not in the central area and the lower film of the film to be processed has a film treatment with a portion of the wrinkles or bubbles cut off, a secondary determination is made on the treatment method of the film to be processed.

[0061] Specifically, in step S4, determining whether the location where wrinkles or bubbles appear on the film to be processed is in the central area includes:

[0062] Step S4401, determining the geometric center based on the shape of the film to be processed;

[0063] Step S4402, taking the geometric center as the origin, dividing an area with the same shape as the film to be processed as the central area range, and the area of ​​the central area range is set to four fifths of the area of ​​the film to be processed;

[0064] Step S4403, using a marking tool to record the location of wrinkles or bubbles;

[0065] Step S4404, comparing the position of the marked wrinkles or bubbles with the previously divided central area range to determine whether it is in the central area.

[0066] Specifically, in step S4, judging whether the locations of wrinkles or bubbles on the film to be processed are evenly distributed includes determining that the locations of wrinkles or bubbles on the film to be processed are evenly distributed when the maximum distance of wrinkles or bubbles on the film to be processed is less than a preset distance.

[0067] The preset distance in the embodiment of the present invention is one twentieth of the diagonal distance of the film to be processed, but the above value is not limited thereto, and those skilled in the art may also adjust the value according to actual needs.

[0068] The present invention determines a specific treatment method according to the location of wrinkles or bubbles in the film to be treated and the treatment of the lower film, and can solve the film quality problem more specifically. If the wrinkles or bubbles are located in the central area, or the location distribution is uneven and the lower film has not been treated, directly replacing the corresponding type of film can ensure the stability of the quality of the core area of ​​the material and avoid affecting the overall performance due to local defects. For example, in a multi-layer flexible phase change material, the quality problem in the central area may have a greater negative impact on key performances such as heat conduction and energy storage. Timely replacement of the film can effectively guarantee these performances. For the case where the lower film is not treated and the wrinkles or bubbles are evenly distributed, the wrinkled or bubble part of the film is selected to be cut off. The integrity and performance of the material can be maintained without wasting a large amount of material. This treatment method not only solves the problem of local defects, but also reduces the cost and resource waste caused by replacing the entire film. At the same time, a secondary judgment is made for specific situations, and the treatment method can be determined more precisely, further improving product quality and performance. The above process improves the accuracy of the analysis of the stacking process of the flexible phase change material and thus improves the performance of the stacked flexible phase change material.

[0069] Specifically, in step S5, when it is determined to perform a secondary determination on the treatment method of the film to be treated, it is determined to remove the film with wrinkles or bubbles or replace the corresponding type of film according to the comparison result of the mapping overlap area ratio of the lower film treated with the film with wrinkles or bubbles removed and the preset area ratio;

[0070] When the mapping overlap area ratio of the lower film processed by cutting out the wrinkled or bubbled part of the film is less than the preset area ratio, it is determined to cut out the wrinkled or bubbled part of the film;

[0071] When the mapping overlap area ratio of the lower film processed by cutting out wrinkles or bubbles is greater than or equal to the preset area ratio, it is determined to replace the corresponding type of film.

[0072] The mapping overlap area ratio of the lower film with the wrinkles or bubbles cut out described in the embodiment of the present invention is the ratio of the sum of the area of ​​the film with the wrinkles or bubbles cut out mapped to the lower film and the area of ​​the lower film with the wrinkles or bubbles cut out to the face value of the lower film. The overlapping area of ​​the area of ​​the film with the wrinkles or bubbles cut out mapped to the lower film and the area of ​​the lower film with the wrinkles or bubbles cut out does not need to be calculated repeatedly.

[0073] In the embodiment of the present invention, the first film, the second film, and the first film are stacked in sequence in a relatively closed space or a wind shield device is used to reduce air flow.

[0074] The present invention determines the final treatment method by comparing the mapping overlap area ratio of the lower film with the wrinkle or bubble part of the film treatment with the preset area ratio, so that the treatment of the problem film is more accurate. This secondary judgment mechanism can select the most appropriate treatment method according to the specific defect situation under complex production conditions, avoiding the problem of over-treatment or under-treatment that may be caused by a single treatment method, thereby effectively improving the quality of the product. For example, if the treatment method is determined based on only one judgment, the severity of the problem may be misjudged in some cases, resulting in unnecessary material waste or product quality degradation. The secondary judgment can more accurately evaluate the problem and ensure the stability of product performance. The calculation method of the mapping overlap area ratio of the lower film with the wrinkle or bubble part of the film treatment is clarified, providing a scientific basis for judgment. This calculation method takes into account the relationship between the film to be treated and the lower film, and can more comprehensively evaluate the severity of the problem. For example, by calculating the overlap area ratio, it can be determined whether the problem is concentrated in a specific area or has spread to a larger range, thereby providing an accurate reference for choosing to cut off part of the film or replace the entire film. Through the above process, the accuracy of the analysis of the flexible phase change material stacking process is improved, thereby improving the performance of the flexible phase change material after stacking.

[0075] Specifically, a multilayer flexible phase change material with high enthalpy and high thermal conductivity obtained by the method for preparing a multilayer flexible phase change material with high enthalpy and high thermal conductivity comprises: the mass parts of the components of the multilayer flexible phase change material with high enthalpy and high thermal conductivity are 76 to 80 parts of paraffin, 19 to 20 parts of a linear triblock copolymer and 0 to 6 parts of expanded graphite.

[0076] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

[0077] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. 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 method for preparing a multilayer flexible phase change material with high enthalpy value and high thermal conductivity, characterized in that: include: Heating paraffin wax at a preset melting temperature to obtain liquid paraffin wax, adding a linear triblock copolymer to the liquid paraffin wax and stirring the mixture at a constant temperature to obtain a first mixture, and pressing the first mixture into a film form using a press to obtain a first film; Adding expanded graphite powder to the first mixture at a constant temperature at a uniform speed, and continuously stirring until the mixture is uniformly mixed to obtain a second mixture, and pressing the second mixture into a film form using a press to obtain a second film; The first film, the second film, and the first film are stacked in order, and then placed on an intelligent temperature-controlled electric heating plate, and the films are bonded to each other by their own viscosity to obtain a block object; When stacking films, determining whether to process the film based on the area ratio of wrinkles or bubbles on the topmost film when the films are stacked in single layers, and under the condition of determining that the film is to be processed, determining whether to replace the corresponding type of film, or to cut off the wrinkled or bubbled film, or making a secondary determination on the processing method of the film to be processed, based on whether the location where wrinkles or bubbles appear on the film to be processed is in the central area, and whether there is a film below the film to be processed that needs to be processed by cutting off wrinkles or bubbles, and the processing method includes replacing the corresponding type of film or cutting off wrinkles or bubbles; When the treatment method of the film to be treated is secondarily determined, it is determined to replace the corresponding type of film or to cut off the film with wrinkles or bubbles according to the mapped overlap area of ​​the lower film of the film to be treated with the film having wrinkles or bubbles cut off; The block objects that are alternately stacked and bonded are cut along a direction parallel to the stacking direction to obtain a multilayer flexible phase change material with high enthalpy value and high thermal conductivity.

2. The method for preparing a multilayer flexible phase change material with high enthalpy and high thermal conductivity according to claim 1, characterized in that: The determining whether to process the film comprises: If the area ratio of wrinkles or bubbles in the topmost film when the films are stacked in single layers is greater than or equal to the preset area ratio, it is determined that the film needs to be processed.

3. The method for preparing a multilayer flexible phase change material with high enthalpy and high thermal conductivity according to claim 2, characterized in that: Under the condition of determining to process the film, the step of determining to replace the corresponding type of film, cutting off the film with wrinkles or bubbles, or performing a secondary determination on the processing method of the film to be processed includes: If the location where wrinkles or bubbles appear on the film to be treated is in the central area, or the lower film of the film to be treated does not have a film treatment in which wrinkles or bubbles are removed and the locations where wrinkles or bubbles appear on the film to be treated are unevenly distributed, it is determined to replace the corresponding type of film; If the lower film of the film to be treated does not have a film to be treated by cutting out wrinkles or bubbles and the locations of wrinkles or bubbles in the film to be treated are evenly distributed, it is determined to cut out the film with wrinkles or bubbles; If the location where wrinkles or bubbles appear on the film to be processed is not in the central area and the underlying film of the film to be processed has a portion of the film with wrinkles or bubbles cut off, a secondary determination is made on the processing method of the film to be processed.

4. The method for preparing a multilayer flexible phase change material with high enthalpy and high thermal conductivity according to claim 3, characterized in that: The second determination of the treatment method of the film to be treated comprises: If the mapping overlap area ratio of the lower film processed by cutting out the wrinkled or bubbled part of the film is less than the preset area ratio, it is determined to cut out the wrinkled or bubbled part of the film; If the mapping overlap area ratio of the lower film processed by cutting out wrinkles or bubbles is greater than or equal to the preset area ratio, it is determined to replace the corresponding type of film.

5. The method for preparing a multilayer flexible phase change material with high enthalpy and high thermal conductivity according to claim 4, characterized in that: The mapping overlap area ratio of the lower film with the wrinkles or bubbles cut out is the ratio of the sum of the area of ​​the film with the wrinkles or bubbles cut out mapped to the lower film and the area of ​​the lower film with the wrinkles or bubbles cut out to the face value of the lower film. The overlapping area of ​​the area of ​​the film with the wrinkles or bubbles cut out mapped to the lower film and the area of ​​the lower film with the wrinkles or bubbles cut out does not need to be calculated repeatedly.

6. The method for preparing a multilayer flexible phase change material with high enthalpy and high thermal conductivity according to claim 1, characterized in that: Determining whether the location where wrinkles or bubbles appear in the film to be treated is in the central area includes: Based on the shape of the film to be processed and determining the geometric center; Taking the geometric center as the origin, divide the area with the same shape as the film to be processed as the central area range, and the area of ​​the central area range is set to four fifths of the area of ​​the film to be processed; Use a marking tool to record where wrinkles or bubbles are; The position of the marked wrinkles or bubbles is compared with the previously divided central area range to determine whether it is in the central area.

7. The method for preparing a multilayer flexible phase change material with high enthalpy and high thermal conductivity according to claim 3, characterized in that: Judging that the locations where wrinkles or bubbles appear on the film to be processed are evenly distributed includes determining that the locations where wrinkles or bubbles appear on the film to be processed are evenly distributed when the maximum distance of wrinkles or bubbles appearing on the film to be processed is less than a preset distance.

8. The method for preparing a multilayer flexible phase change material with high enthalpy and high thermal conductivity according to claim 7, characterized in that: The preset distance is determined according to the diagonal distance of the film to be processed.

9. The method for preparing a multilayer flexible phase change material with high enthalpy and high thermal conductivity according to claim 1, characterized in that: When the first film, the second film, and the first film are stacked in sequence, they are placed in a relatively closed space or a wind shield device is used to reduce air flow.

10. A multi-layer flexible phase change material with high enthalpy and high thermal conductivity obtained by the method for preparing a multi-layer flexible phase change material with high enthalpy and high thermal conductivity as claimed in any one of claims 1 to 9, characterized in that: include: The mass parts of the components of the multilayer flexible phase change material with high enthalpy value and high thermal conductivity are 76 to 80 parts of paraffin, 19 to 20 parts of linear tri-embedded copolymer and 0 to 6 parts of expanded graphite.

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