High-efficiency graphite composite heat dissipation component and preparation method thereof

Abstract

The present application relates to a kind of high-efficiency graphite composite heat dissipation components, the heat dissipation component includes quick heat dissipation layer, high-efficiency cooling layer, quick heat dissipation layer includes at least three graphite film layers, and graphite film layer is bonded by heat-conducting double-sided adhesive layer between, at least one graphite film layer in it is bonded high-efficiency cooling layer by heat-conducting double-sided adhesive layer on the outer surface, and high-efficiency cooling layer is superabsorbent polymer film layer.Superabsorbent polymer film layer is SAP resin or the film that can be made of renewable biomass and hygroscopic salt.The high-efficiency graphite composite heat dissipation component of the present application compared with existing graphite metal composite heat dissipation component and pure graphite heat dissipation component and other materials, using the characteristics of superabsorbent polymer film material adsorbing water mist in air, forms high-efficiency cooling layer, has higher heat conduction efficiency, and manufacturing process is simpler, production cost is lower, can be made into super-thick heat dissipation component, has greater heat flux, overall heat dissipation effect is better, has more extensive application prospect.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat dissipation materials, in particular to a high-efficiency graphite composite heat dissipation component and a preparation method thereof. BACKGROUND

[0002] In the 5G era, more high-frequency and high-power devices have emerged, and with the emergence of such devices, efficient heat dissipation has become a problem to be solved. For heat management materials, the amount of heat conducted in a certain time not only depends on the level of thermal conductivity, but also is related to its thickness, which is similar to the water pipe conducting water flow. When the flow rate is constant, the thicker the water pipe, the more water is conducted. Therefore, high-efficiency heat management materials, i.e. materials with high heat flux, need to have both high thermal conductivity and high thickness.

[0003] Currently commonly used heat management materials can be mainly divided into metal materials and non-metal materials. Traditional metal materials are mainly aluminum and copper, which can be easily thickened due to their easy processability, but their thermal conductivity is limited by the limited number of free electrons, so the thermal conductivity is limited and it is difficult to exceed 500 W / mk. High-thermal-conductivity non-metal materials are mainly carbon-based films, such as carbonized polyimide films and highly oriented pyrolytic graphite. For example, although the existing solution processing technology of graphene and graphene oxide and the pressing technology based on graphene powder can manufacture high-thickness graphene films at high cost, the former has a lower orientation degree and lower thermal conductivity due to factors such as unevenness of solvent volatilization (the volatilization of the inner layer solvent is limited by the shell structure formed by the volatilization of the surface layer solvent); and the latter has a reduced thermal conductivity due to the difficulty in eliminating the boundaries between the powders.

[0004] On the other hand, as a relatively new heat dissipation technology, VC (Vapor Chamber, full name: vacuum chamber heat plate) is usually directly used for notebook computer or high-end mobile phone chip heat dissipation. SUMMARY

[0005] The purpose of the present application is to overcome the above-mentioned shortcomings of the prior art, and to provide a high-efficiency graphite composite heat dissipation component and a preparation method thereof, which solve the problems of low thermal conductivity, poor heat dissipation effect and high cost of existing heat dissipation materials.

[0006] The technical scheme adopted by the present application is: a high-efficiency graphite composite heat dissipation component, which comprises a rapid heat dissipation layer and a high-efficiency cooling layer, wherein the rapid heat dissipation layer comprises at least three graphite film layers, and the graphite film layers are bonded by a heat-conducting double-sided adhesive layer, and the outer surface of at least one graphite film layer is bonded to the high-efficiency cooling layer by a heat-conducting double-sided adhesive layer, and the high-efficiency cooling layer is a super-hygroscopic polymer film layer or a VC heat plate.

[0007] In the heat-dissipating component, the super-absorbent polymer film layer is a SAP resin or a film composed of renewable biomass and an absorbent salt.

[0008] In the heat-dissipating component, the super-absorbent polymer film layer is a film composed of polyacrylic acid sodium fibers with a thickness greater than 100 μm.

[0009] In the heat-dissipating component, the adhesive fixing layer is compounded on the outer surface of one of the high-efficiency cooling layers, and a heat-conducting insulating layer is compounded on the surface away from the adhesive fixing layer. The adhesive fixing layer can also be a heat-conducting double-sided adhesive material, so that the heat-dissipating component is fixedly connected to the heat source to be cooled for heat conduction. The heat-conducting insulating layer on the outer side provides insulation protection and prevents the heat-dissipating component from being in electrical contact with other electronic components.

[0010] In the heat-dissipating component, the heat-conducting insulating layer is a single-sided adhesive tape with a black heat-conducting insulating coating with a thickness of 5-20 μm, and the adhesive fixing layer is a double-sided adhesive tape or a heat-conducting double-sided adhesive tape with a thickness of 5-50 μm.

[0011] In the heat-dissipating component, the graphite film layer has a thickness of 100-200 μm and a heat-conductivity coefficient of 1000-2000 W / mk.

[0012] In the heat-dissipating component, the heat-conducting double-sided adhesive layer has a thickness of 5-20 μm.

[0013] The application also provides a preparation method of the high-efficiency graphite composite heat-dissipating component, which comprises the following steps:

[0014] In step a, the multiple graphite film layers are compounded and compressed by the heat-conducting double-sided adhesive layer to remove air between the interfaces, thereby forming a rapid heat-dissipating layer containing at least three graphite film layers.

[0015] In step b, the outer graphite film layer of the rapid heat-dissipating layer obtained in step a is compounded with the super-absorbent polymer film layer by the heat-conducting double-sided adhesive layer and compressed to remove air between the interfaces, thereby forming a rapid heat-dissipating layer and high-efficiency cooling layer composite component.

[0016] In step c, the double-sided adhesive layer is compounded on the outer surface of the high-efficiency cooling layer of the composite component obtained in step b as an adhesive fixing layer, and finally cut into the required shape.

[0017] In step c of the above process, a heat-conducting insulating layer is compounded on the outer surface of the rapid heat-dissipating layer before cutting.

[0018] In use, the release film outside the adhesive fixing layer is peeled off, the heat dissipation component is attached to the surface of the heat source through the adhesive fixing layer, and the heat generated by the heat source such as a chip and its support during operation is first transmitted to the high-efficiency cooling layer. The trace amount of water mist in the air adsorbed by the superabsorbent polymer film layer makes the heat transmitted under the condition of evaporation or evaporation of trace amount of water mist, and part of the water vapor carries heat to the rapid heat dissipation layer. The heat is rapidly dissipated and cooled through the multi-layer graphite film layer in the rapid heat dissipation layer, so that the heat conduction efficiency and heat dissipation effect of the whole heat dissipation component are greatly improved.

[0019] Compared with the existing graphite metal composite heat dissipation component and the pure graphite heat dissipation component, the high-efficiency graphite composite heat dissipation component utilizes the characteristics of the superabsorbent polymer film material to adsorb water mist in the air to form a high-efficiency cooling layer, has higher heat conduction efficiency, simpler manufacturing process, lower production cost, can be made into an ultra-thick heat dissipation component, has larger heat flux, better overall heat dissipation effect, and has wider application prospect and application range. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a structural schematic diagram of an embodiment of the present application;

[0021] Figure 2 、 Figure 3 is a structural schematic diagram of another two embodiments of the present application;

[0022] Figure 4 is a heat dissipation effect comparison diagram of the embodiment of the present application and the prior art heat dissipation component; DETAILED DESCRIPTION

[0023] The preparation method of the high-efficiency graphite composite heat dissipation component comprises the following steps:

[0024] Step a, the multi-layer graphite film layer is combined and compressed through the heat-conducting double-sided adhesive layer to remove the air between the interfaces, forming a rapid heat dissipation layer containing at least three layers of graphite film layers;

[0025] Step b, the rapid heat dissipation layer obtained in step a is combined with the superabsorbent polymer film layer through the heat-conducting double-sided adhesive layer and the air between the interfaces is compressed and removed, forming a rapid heat dissipation layer and a high-efficiency cooling layer composite component;

[0026] Step c, a double-sided adhesive layer is combined as an adhesive fixing layer on the outer surface of the high-efficiency cooling layer of the composite component obtained in step b; and finally cut into the required shape.

[0027] In the above process, in step c, a heat-conducting insulating layer is combined on the outer surface of the rapid heat dissipation layer before cutting.

[0028] Example 1

[0029] As shown in Figure 1 the high-efficiency graphite composite heat dissipation component of the present embodiment includes a rapid heat dissipation layer 1 and a high-efficiency cooling layer 2, wherein the rapid heat dissipation layer 1 includes three graphite film layers 11, and the graphite film layers 11 are bonded by a heat-conducting double-sided adhesive layer 12, in the present embodiment, the thickness of each graphite film layer 11 is 160 μm, the thermal conductivity is 1400 W / mk, and a 10 μm heat-conducting double-sided adhesive layer 12 is arranged between the graphite film layers 11; a single-sided adhesive tape with a thickness of 20 μm and a heat-conducting and insulating coating is compounded on the surface of the uppermost graphite film layer 11 in the figure as a heat-conducting and insulating layer 13; a 1 mm-thick super-hygroscopic polymer film layer is compounded on the lower surface of the lowermost graphite film layer 11 in the figure by a heat-conducting double-sided adhesive layer as a high-efficiency cooling layer 2, and a 30 μm-thick double-sided adhesive layer is compounded on the lower surface of the super-hygroscopic polymer film layer as a bonding and fixing layer 3, thereby forming a heat dissipation component with a total thickness of 1560 μm as shown in Figure 1 .

[0030] Example 2

[0031] As shown in Figure 2 the high-efficiency graphite composite heat dissipation component of the present embodiment includes a rapid heat dissipation layer 1 and a high-efficiency cooling layer 2, wherein the rapid heat dissipation layer 1 includes nine graphite film layers 11, and the graphite film layers 11 are bonded by a heat-conducting double-sided adhesive layer 12, in the present embodiment, the thickness of each graphite film layer 11 is 100 μm, the thermal conductivity is 1500 W / mk, and a 5 μm heat-conducting double-sided adhesive layer 12 is arranged between the graphite film layers 11; a single-sided adhesive tape with a thickness of 20 μm and a heat-conducting and insulating coating is compounded on the surface of the uppermost graphite film layer 11 in the figure as a heat-conducting and insulating layer 13; a 500 μm-thick polyacrylic acid sodium fiber film is compounded on the lower surface of the lowermost graphite film layer 11 in the figure by a heat-conducting double-sided adhesive layer as a high-efficiency cooling layer 2, and a 10 μm-thick double-sided adhesive layer is compounded on the lower surface of the polyacrylic acid sodium fiber film as a bonding and fixing layer 3, thereby forming a heat dissipation component with a total thickness of 1475 μm as shown in Figure 1 .

[0032] Example 3

[0033] As shown in Figure 3As shown, this embodiment of the high-efficiency graphite composite heat dissipation component includes a rapid heat dissipation layer 1 and a high-efficiency cooling layer 2. The rapid heat dissipation layer 1 comprises six graphite film layers 11, which are bonded together by a thermally conductive double-sided adhesive layer 12. In this embodiment, each graphite film layer 11 has a thickness of 200 μm and a thermal conductivity of 1000 W / mK. A 20 μm thermally conductive double-sided adhesive layer 12 is disposed between the graphite film layers 11. A 10 μm thick single-sided adhesive tape with a thermally conductive insulating coating is laminated onto the surface of the uppermost graphite film layer 11 as a thermally conductive insulating layer 13. A 1.2 mm thick sodium polyacrylate fiber film is laminated onto the lower surface of the lowermost graphite film layer 11 via a thermally conductive double-sided adhesive layer as a high-efficiency cooling layer 2. A 50 μm thick double-sided adhesive layer is then laminated onto the lower surface of the sodium polyacrylate fiber film as an adhesive fixing layer 3, thereby forming... Figure 1 The heat dissipation component shown has an overall thickness of 2580μm.

[0034] Example 4

[0035] like Figure 3 As shown, this embodiment of the high-efficiency graphite composite heat dissipation component includes a rapid heat dissipation layer 1 and a high-efficiency cooling layer 2. The rapid heat dissipation layer 1 comprises six graphite film layers 11, which are bonded together by a thermally conductive double-sided adhesive layer 12. In this embodiment, each graphite film layer 11 has a thickness of 160 μm and a thermal conductivity of 2000 W / mK. A 15 μm thermally conductive double-sided adhesive layer 12 is disposed between the graphite film layers 11. A 5 μm thick single-sided adhesive tape with a thermally conductive insulating coating is laminated onto the surface of the uppermost graphite film layer 11 as a thermally conductive insulating layer 13. A 1 mm thick VC heat spreader is laminated onto the lower surface of the lowermost graphite film layer 11 via a thermally conductive double-sided adhesive layer as a high-efficiency cooling layer 2. A 5 μm thick double-sided adhesive layer is then laminated onto the lower surface of the VC heat spreader as an adhesive fixing layer 3, thereby forming... Figure 1 The heat dissipation component shown has an overall thickness of 2060μm.

[0036] In use, the release film on the outer surface of the adhesive fixing layer 3 is peeled off, and the heat dissipation component is attached to the surface of the heat source through the adhesive fixing layer 3. The heat generated by the heat source, such as the chip and its bracket, during operation is first transferred to the high-efficiency cooling layer 2. The heat is rapidly cooled by the evaporation or volatilization of the trace water mist in the air adsorbed by the super hygroscopic polymer film layer. Some of the water vapor carries the heat to the rapid heat dissipation layer 1, and the heat is rapidly dissipated and cooled by the multi-layer graphite film layer 11 in the rapid heat dissipation layer 1, thereby greatly improving the thermal conductivity and heat dissipation effect of the overall heat dissipation component.

[0037] like Figure 4As shown, the heat dissipation component (example: total thickness 1.64 mm, excluding double-sided adhesive layer) has greater heat flux and faster heat transfer speed than the currently commercially available Al+graphite composite heat dissipation material (110 μm) and single-layer graphite heat dissipation material (thickness 32 μm, thermal conductivity 1200 W / mk).

[0038] In addition, samples of embodiments 1-3 of the present application were taken, and sample specifications were: length x width = 25 mm x 80 mm. Heat dissipation experiments were conducted in comparison with Al+graphite composite heat dissipation material (thickness 110 μm) and single-layer graphite material (thickness 32 μm) of the same size. The samples of the heat dissipation component were connected to a heat block under the same conditions, the constant power of the heat block was 3.7 W, the heat area was 2.16 cm2, the temperature drop at the center of the heat area was measured, and the initial temperature at the center of the heat area was 70℃. The temperature drop at the center of the heat area after the same interval was as follows:

[0039] Embodiment 1: the initial temperature of the heat block was 70℃, and the temperature of the heat block dropped to 56℃ after an interval of 25 seconds;

[0040] Embodiment 2: the initial temperature of the heat block was 70℃, and the temperature of the heat block dropped to 53℃ after an interval of 25 seconds;

[0041] Embodiment 3: the initial temperature of the heat block was 70℃, and the temperature of the heat block dropped to 48℃ after an interval of 25 seconds;

[0042] Comparative Example 1 (Al+graphite composite heat dissipation material): the initial temperature of the heat block was 70℃, and the temperature of the heat block dropped to 66℃ after an interval of 25 seconds;

[0043] Comparative Example 2 (single-layer graphite material): the initial temperature of the heat block was 70℃, and the temperature of the heat block dropped to 68℃ after an interval of 25 seconds.

[0044] The high-efficiency graphite composite heat dissipation component of the present application has higher thermal conductivity efficiency, simpler manufacturing process, lower production cost, can be made into an ultra-thick heat dissipation component, has greater heat flux, better overall heat dissipation effect, and has a wider application prospect and application range, compared with the existing graphite metal composite heat dissipation component and the pure graphite heat dissipation component.

[0045] It can be understood that the above embodiments are only exemplary embodiments adopted to illustrate the principles of the present application, and the present application is not limited thereto. Various modifications and improvements can be made by those skilled in the art without departing from the spirit and essence of the present application, and these modifications and improvements are also considered to be within the protection scope of the present application.

Claims

1. A high efficient graphite composite heat sink, characterized by: The heat dissipation component comprises a rapid heat dissipation layer and a high-efficiency cooling layer, wherein the rapid heat dissipation layer comprises at least three graphite film layers, and the graphite film layers are bonded by a heat-conducting double-sided adhesive layer, and the outer surface of at least one graphite film layer is bonded with the high-efficiency cooling layer by a heat-conducting double-sided adhesive layer, the high-efficiency cooling layer is a super-hygroscopic polymer film layer, and the super-hygroscopic polymer film layer is a SAP resin or a film composed of renewable biomass and hygroscopic salt.

2. The high-efficiency graphite composite heat dissipation member according to claim 1, characterized by: The super-hygroscopic polymer film layer is a film composed of polyacrylic acid sodium fibers with a thickness greater than 100 μm.

3. The high efficient graphite composite heat dissipation member according to claim 1, characterized by: The outer surface of one of the high-efficiency cooling layers is compounded with a bonding fixing layer, and the surface away from the bonding fixing layer is compounded with a heat-conducting insulating layer.

4. The high-efficiency graphite composite heat spreading member according to claim 3, characterized by: The heat-conducting insulating layer is a single-sided adhesive tape with a black heat-conducting insulating coating with a thickness of 5-20 μm, and the bonding fixing layer is a double-sided adhesive tape or a heat-conducting double-sided adhesive tape with a thickness of 5-50 μm.

5. The high efficient graphite composite heat sink part according to claim 1, characterized by: The thickness of the graphite film layer is 100-200 μm, and the heat conductivity coefficient is 1000-2000 W / mk.

6. The high-efficiency graphite composite heat dissipation member according to claim 1 or 4, characterized by: The thickness of the heat-conducting double-sided adhesive layer is 5-20 μm.

7. A method of manufacturing a high efficient graphite composite heat dissipation component, characterized by: The preparation method comprises the following steps: Step a: the multiple graphite film layers are compounded and compressed by a heat-conducting double-sided adhesive layer to remove air between the interfaces, thereby forming a rapid heat dissipation layer comprising at least three graphite film layers; Step b: the outer graphite film layer of the rapid heat dissipation layer obtained in step a is compounded with a super-hygroscopic polymer film layer by a heat-conducting double-sided adhesive layer, and compressed to remove air between the interfaces, thereby forming a rapid heat dissipation layer and a high-efficiency cooling layer composite component; Step c: a double-sided adhesive layer is compounded on the outer surface of the high-efficiency cooling layer of the composite component obtained in step b as a bonding fixing layer; and finally, the component is cut into a desired shape.

8. The method of claim 7, wherein the high-efficiency graphite composite heat dissipation member is prepared by the steps of: In step c, a heat-conducting insulating layer is compounded on the outer surface of the rapid heat dissipation layer before cutting. ​

Images