Graphene heat-conducting gasket with edge covered by protective film and preparation method of graphene heat-conducting gasket

Abstract

The invention provides a graphene heat-conducting gasket with a protective film covered edge, which comprises a graphene heat-conducting gasket body and a protective film, and is characterized in that the periphery of the side surface of the graphene heat-conducting gasket body is covered by the protective film; or the edge of the upper surface of the graphene heat-conducting gasket body, the edge of the lower surface of the graphene heat-conducting gasket body and the side surface of the graphene heat-conducting gasket body are wrapped in the protective film; or the edge of one surface of the graphene heat-conducting gasket body and the side surface of the graphene heat-conducting gasket body are coated in the protective film. The graphene heat-conducting gasket body is coated with the integrated protective film, the front and back edges and the side faces of the graphene heat-conducting gasket body can be fully covered, the coated areas on the upper and lower surfaces intervene in the interface of a heat source and a radiator in the application process, the graphene heat-conducting gasket body is completely sealed, and the service life of the graphene heat-conducting gasket is prolonged. And the graphene heat-conducting gasket body is prevented from falling off.

Description

Technical Field

[0001] The present invention relates to a graphene heat-conducting gasket with a protective film edge and a preparation method thereof Background Art

[0002] With the rapid development of various electronic products, the performance of electronic components has been developed rapidly. At present, with the improvement of performance, the heat generation of devices has also increased. For example, the high brightness of the display increases the usage amount and frequency requirements of light-emitting diodes, the high-speed operation of the CPU increases the battery power consumption, and the battery capacity also increases accordingly. While these electronic components are working at high speed, they consume more energy and generate heat faster and more, which puts higher requirements on heat dissipation components. If heat cannot be dissipated in time, it will lead to a shortened service life of the device Summary of the Invention

[0003] The object of the present invention is to provide a graphene heat-conducting gasket with a protective film edge and a preparation process thereof to solve the above technical problems

[0004] To solve the above technical problems, the technical solution of the present invention is: a graphene heat-conducting gasket with a protective film edge, including a graphene heat-conducting gasket body and a protective film, and the protective film covers the graphene heat-conducting gasket body

[0005] In some embodiments, the graphene heat-conducting gasket body includes graphene arranged longitudinally, and the graphene penetrates through the upper and lower surfaces of the graphene heat-conducting gasket body to form a continuous heat-conducting structure

[0006] In some embodiments, the protective film is an integral protective film

[0007] In some embodiments, the protective film is a "hui"-shaped integral protective film

[0008] In some embodiments, the four sides of the side surface of the graphene heat-conducting gasket body are covered in the protective film

[0009] In some embodiments, the protective film is a protective film formed after curing of polyurethane, polysiloxane, styrene-butadiene latex, paraffin, polyethylene terephthalate, epoxy resin, polyethylene, acrylic resin, or polyimide

[0010] In some embodiments, the edge of the upper surface of the graphene heat-conducting gasket body, the edge of the lower surface of the graphene heat-conducting gasket body, and the side surface of the graphene heat-conducting gasket body are covered in the protective film

[0011] In some embodiments, the overall width of the "hui"-shaped integral protective film is equal to 2 times the width of the graphene heat-conducting gasket body that needs to be edge-wrapped with the protective film plus the thickness of the graphene heat-conducting gasket body

[0012] In some embodiments, the edges of one surface of the graphene thermal conductive gasket body and the side surfaces of the graphene thermal conductive gasket body are covered within the protective film, and the other surface of the graphene thermal conductive gasket body is attached to the application substrate through the protective film extending to the surface of the application substrate.

[0013] In some embodiments, the width of the overall "hui"-shaped integrated protective film = the width of the graphene thermal conductive gasket body that requires the protective film to wrap the edges + the thickness of the graphene thermal conductive gasket body + the fitting width of the protective film and the application substrate.

[0014] In some embodiments, for the two edges of the graphene thermal conductive gasket body in the graphene orientation direction, the graphene thermal conductive gasket body with the protective film wrapping the edges includes:

[0015] The upper surface of the edge of the graphene thermal conductive gasket body in the graphene orientation direction;

[0016] The lower surface of the edge of the graphene thermal conductive gasket body in the graphene orientation direction;

[0017] And the two side surfaces of the graphene thermal conductive gasket body in the graphene orientation direction;

[0018] For the two edges of the graphene thermal conductive gasket body perpendicular to the graphene orientation direction, the graphene thermal conductive gasket body with the protective film wrapping the edges includes:

[0019] The upper surface of the edge of the graphene thermal conductive gasket body perpendicular to the graphene orientation direction,

[0020] And the two side surfaces of the graphene thermal conductive gasket body perpendicular to the graphene orientation direction;

[0021] The lower surface of the edge of the graphene thermal conductive gasket body perpendicular to the graphene orientation direction is attached to the application substrate.

[0022] In some embodiments, for the two edges of the graphene thermal conductive gasket body in the graphene orientation direction: the width of the "hui"-shaped integrated protective film in the graphene orientation direction is equal to 2 * the width of the graphene thermal conductive gasket body that requires the protective film to wrap the edges + the thickness of the graphene thermal conductive gasket body; the width of the "hui"-shaped integrated protective film used for the edges and side surfaces of the graphene thermal conductive gasket body perpendicular to the graphene orientation direction and the application substrate = the width of the graphene thermal conductive gasket body that requires the protective film to wrap the edges + the thickness of the graphene thermal conductive gasket body + the fitting width of the protective film and the application substrate.

[0023] In some embodiments, the thickness range of the protective film is 1 - 30 microns.

[0024] In some embodiments, the proportion of the area of one surface of the graphene thermal conductive gasket body covered by the protective film to the area of one surface of the graphene thermal conductive gasket body is 0.0%-30%.

[0025] In some embodiments, the thickness of the area of the graphene thermal conductive gasket body covered by the protective film is the same as that of the area of the graphene thermal conductive gasket body not covered by the protective film.

[0026] In some embodiments, the tensile strength of the protective film is greater than that of the graphene thermal conductive gasket body.

[0027] In some embodiments, under the same tensile force, the elongation rate of the protective film is less than that of the graphene thermal conductive gasket body.

[0028] In some embodiments, the bonding force between the protective film and the graphene thermal conductive gasket body is ≥100 g / 25 mm.

[0029] To solve the above technical problems, the present invention also discloses a preparation method of a graphene thermal conductive gasket with a protective film edge wrapping, including:

[0030] Step (1), preparing part A: Die-cutting the graphene thermal conductive gasket body according to the required size;

[0031] Centering and pressing a limiting device on the upper and lower surfaces of the die-cut graphene thermal conductive gasket body, the area of the limiting device being less than or equal to that of the graphene thermal conductive gasket body, exposing the graphene thermal conductive gasket body that needs to be wrapped with the protective film to obtain part A;

[0032] Step (2), preparing part B: Preparing the protective film on the surface of the release film, cutting the protective film with the release film, and obtaining a protective film frame that matches the shape and size of the graphene thermal conductive gasket body that needs to be wrapped with the protective film;

[0033] Step (3), wrapping the edge of one surface of the graphene thermal conductive gasket body with the protective film frame;

[0034] Step (4), wrapping the side surface of the graphene thermal conductive gasket body and the edge of the other surface with the protective film frame;

[0035] Step (5), applying pressure to the protective film to make the thickness of the area of the graphene thermal conductive gasket body covered by the protective film the same as that of the area of the graphene thermal conductive gasket body not covered by the protective film, making the protective film completely fit part A, removing the release film, and removing the limiting device of part A to obtain a graphene thermal conductive gasket with a protective film edge wrapping.

[0036] In some embodiments, the step of wrapping the edge of one surface of the graphene thermal conductive gasket body with the protective film frame in step (iii) is as follows: Transfer part B to one surface of part A, with the protective film side of part B facing the graphene thermal conductive gasket body side of part A, and align and bond the protective film of part B with the graphene thermal conductive gasket body of part A that exposes the part requiring protective film edge wrapping.

[0037] In some embodiments, the step of wrapping the side surface of the graphene thermal conductive gasket body and the edge of the other surface of the graphene thermal conductive gasket body with the protective film frame in step (iv) is as follows: Press down the protective film to bond it to the side surface of the graphene thermal conductive gasket body of part A that exposes the part requiring protective film edge wrapping, and then bend the protective film towards the other surface of the graphene thermal conductive gasket body of part A to bond it to the other surface of the graphene thermal conductive gasket body of part A.

[0038] In some embodiments, the graphene thermal conductive gasket body that requires protective film edge wrapping in step (i) includes:

[0039] The edge of the upper surface of the graphene thermal conductive gasket body,

[0040] The edge of the lower surface of the graphene thermal conductive gasket body,

[0041] And the four sides of the side surface of the graphene thermal conductive gasket body.

[0042] In some embodiments, in step (ii), cut the protective film of part B to form a "hui" - shaped protective film on the release film surface of part B.

[0043] In some embodiments, the width of the "hui" - shaped protective film is equal to 2 times the width of the graphene thermal conductive gasket body that requires protective film edge wrapping plus the thickness of the graphene thermal conductive gasket body.

[0044] In some embodiments, the graphene thermal conductive gasket body that requires protective film edge wrapping in step (i) includes:

[0045] The edge of the upper surface of the graphene thermal conductive gasket body,

[0046] The four sides of the side surface of the graphene thermal conductive gasket body.

[0047] The protective film also wraps the surface of the application substrate.

[0048] To solve the above - mentioned technical problems, the present invention also discloses a preparation method of a graphene thermal conductive gasket with a protective film edge wrapping, which is characterized by including:

[0049] Step (i), prepare part A: Die - cut the graphene thermal conductive gasket body according to the required size;

[0050] Centrally press the limiting device on the upper and lower surfaces of the die-cut graphene thermal conductive gasket body. The area of the limiting device is less than or equal to that of the graphene thermal conductive gasket body, exposing the graphene thermal conductive gasket body that needs to be edge-wrapped with a protective film to obtain part A;

[0051] Step (ii), preparing part B: Pre-prepare the protective film on the surface of the release film, cut the protective film with the release film, and obtain a protective film border that matches the shape and size of the graphene thermal conductive gasket body that needs to be edge-wrapped with a protective film;

[0052] Step (iii), the protective film border covers the edge of one surface of the graphene thermal conductive gasket body;

[0053] Step (iv), the protective film border covers the side surface of the graphene thermal conductive gasket body. Press down the protective film 2 to fit the side surface of the graphene thermal conductive gasket body 1 that is exposed in part A and needs to be edge-wrapped with a protective film, and then bend the protective film outwards to be parallel to the surface of the application substrate and fit the surface of the application substrate;

[0054] Step (v), apply pressure to the protective film so that the thickness of the area of the graphene thermal conductive gasket body covered by the protective film is the same as that of the area of the graphene thermal conductive gasket body not covered by the protective film, make the protective film fully fit part A, remove the release film, and remove the limiting device of part A to obtain a graphene thermal conductive gasket with a protective film edge wrap.

[0055] In some embodiments, the protective film border obtained after cutting in step (ii) is a "hui"-shaped integral protective film. The width of the "hui"-shaped integral protective film = the width of the graphene thermal conductive gasket body that needs to be edge-wrapped with a protective film + the thickness of the graphene thermal conductive gasket body + the fitting width with the application substrate.

[0056] To solve the above technical problems, the present invention also discloses a preparation method of a graphene thermal conductive gasket with a protective film edge wrap, including:

[0057] Step (i), preparing part A: Die-cut the graphene thermal conductive gasket body according to the required size;

[0058] Centrally press the limiting device on the upper and lower surfaces of the die-cut graphene thermal conductive gasket body. The area of the limiting device is less than or equal to that of the graphene thermal conductive gasket body, exposing the graphene thermal conductive gasket body that needs to be edge-wrapped with a protective film to obtain part A;

[0059] Step (ii), preparing part B: Pre-prepare the protective film on the surface of the release film, cut the protective film with the release film, and obtain a protective film border that matches the shape and size of the graphene thermal conductive gasket body that needs to be edge-wrapped with a protective film;

[0060] Step (III): For the two edges of the graphene thermal conductive gasket body 1 in the graphene orientation direction, the protective film is sequentially coated on:

[0061] The upper surface of the edge of the graphene thermal conductive gasket body in the graphene orientation direction;

[0062] And the side surface of the graphene thermal conductive gasket body in the graphene orientation direction;

[0063] The lower surface of the edge of the graphene thermal conductive gasket body in the graphene orientation direction;

[0064] Step (IV): For the two edges of the graphene thermal conductive gasket body perpendicular to the graphene orientation direction, the protective film is sequentially coated on:

[0065] The upper surface of the edge of the graphene thermal conductive gasket body perpendicular to the graphene orientation direction,

[0066] And the side surface of the graphene thermal conductive gasket body perpendicular to the graphene orientation direction;

[0067] The lower surface of the edge of the graphene thermal conductive gasket body perpendicular to the graphene orientation direction is attached to the application substrate;

[0068] Step (V): Apply pressure to the protective film so that the thickness of the area of the graphene thermal conductive gasket body covered by the protective film is the same as the area not covered by the protective film, make the protective film fully fit part A, remove the release film, and remove the limiting device of part A to obtain a graphene thermal conductive gasket with a protective film edge.

[0069] In some embodiments, the protective film frame obtained after cutting in step (II) is a "hui"-shaped integral protective film. For the two edges of the graphene thermal conductive gasket body in the graphene orientation direction: the width of the "hui"-shaped integral protective film in the graphene orientation direction is equal to 2 times the width of the graphene thermal conductive gasket body that needs to be edge-protected + the thickness of the graphene thermal conductive gasket body.

[0070] In some embodiments, the protective film frame obtained after cutting in step (II) is a "hui"-shaped integral protective film. The width of the "hui"-shaped integral protective film used for the edge and side of the graphene thermal conductive gasket body perpendicular to the graphene orientation direction and the application substrate = the width of the graphene thermal conductive gasket body that needs to be edge-protected + the thickness of the graphene thermal conductive gasket body + the fitting width of the protective film and the application substrate.

[0071] The present invention provides a graphene thermal conductive gasket with a protective film edge, which uses an integral protective film to simultaneously cover the upper and lower surfaces and the sides of the graphene thermal conductive gasket, has a complete structure, higher mechanical strength, and a simple process.

[0072] When the graphene thermal conductive gasket with the edge wrapped by the protective film encounters deformation, since the tensile strength of the protective film is higher than that of the graphene thermal conductive gasket body, the elongation rate of the protective film is smaller than that of the graphene thermal conductive gasket body, the elongation rate of the protective film matches that of the graphene thermal conductive gasket body, and the adhesion of the protective film is better. When encountering deformation, the protective film is stressed first; and because the protective film adopted in the present invention is thinner, and the bonding force between the protective film and the graphene thermal conductive gasket body 1 is high, the bonding force between the protective film and the graphene thermal conductive gasket > 100 g / 25 mm, and it will not peel off due to external pulling; moreover, the protective film in the present invention is an integral protective film, the protective film can deform with the deformation of the graphene thermal conductive gasket body, the graphene thermal conductive gasket body will not peel off from the protective film, and the protective film and the graphene thermal conductive gasket body will not be delaminated. The graphene thermal conductive gasket with the integral protective film edge provided by the present invention improves the strength of the graphene thermal conductive gasket while effectively ensuring the thermal conductivity effect.

[0073] The present invention uses an integral protective film to cover the graphene thermal conductive gasket body, which can achieve full coverage from the front, back, edge and side of the graphene thermal conductive gasket body. During application, the covered areas on the upper and lower surfaces are inserted into the interface between the heat source and the radiator, completely sealing the graphene thermal conductive gasket body to prevent the graphene thermal conductive gasket body from shedding slag.

[0074] Strength improvement: Using an integral protective film to cover the graphene thermal conductive gasket body 1, compared with the graphene thermal conductive gasket without covering in Comparative Example 1, the weak edge strength of the graphene thermal conductive gasket covered by the integral protective film in this Example 2 is increased from 51 KPa to more than 300 KPa; the maximum horizontal creep amount under 50% compressive deformation is reduced from 5 mm to less than 0.5 mm.

[0075] High reliability: The integral protective film 2 can deform with the deformation of the graphene thermal conductive gasket body 1, and the graphene thermal conductive gasket body 1 will not be delaminated.

[0076] The present invention connects the graphene thermal conductive gasket and the application substrate through the protective film, provides positioning ability, facilitates automatic placement, and at the same time prevents the graphene thermal conductive gasket from cracking or curling from the edge when subjected to a transverse shear force.

[0077] In some embodiments, the graphene thermal conductive gasket body is composed of a horizontally arranged graphene structure.

[0078] In some embodiments, the protective film is one or more layers of protective films.

[0079] To solve the above technical problems, the present invention also discloses a graphene thermal conductive gasket with a protective film edge. The graphene thermal conductive gasket with a protective film edge includes a graphene thermal conductive gasket body, a first protective film, and a second protective film. The first protective film sequentially covers the edges of the upper surface of the graphene thermal conductive gasket body, the side surface of the graphene thermal conductive gasket body, and the edges of the lower surface of the graphene thermal conductive gasket body. The second protective film covers the upper surface of the first protective film and extends to cover a part of the graphene thermal conductive gasket body. The second protective film covers the side surface of the first protective film and the upper surface of the application substrate.

[0080] In some embodiments, both the first protective film and the second protective film are integral protective films.

[0081] To solve the above technical problems, the present invention also discloses a heat sink. The heat sink includes a heat sink and a thermal conductive gasket covering the bottom surface of the heat sink. The thermal conductive gasket is the above-mentioned graphene thermal conductive gasket with a protective film edge.

[0082] To solve the above technical problems, the present invention also discloses a chip packaging structure. The chip packaging structure includes a semiconductor chip and a thermal conductive gasket covering the semiconductor chip. The thermal conductive gasket is the above-mentioned graphene thermal conductive gasket with a protective film edge as claimed in the claims.

[0083] The graphene thermal conductive gasket with a protective film edge provided by the present invention enhances the structural strength of the graphene thermal conductive gasket, improves the transverse shear resistance, and provides adhesiveness, enabling the graphene thermal conductive gasket to have repeatable adhesiveness. At the same time, it ensures the integrity of the structure of the graphene thermal conductive gasket during the repeated mounting process, and avoids the risk of chipping that may occur during the repeated placement of the graphene thermal conductive gasket. BRIEF DESCRIPTION OF THE DRAWINGS

[0084] Figure 1a Schematic diagram of the structure of the graphene thermal conductive gasket with a protective film edge according to Embodiment 1 of the present invention;

[0085] Figure 1b For Figure 1a sectional view;

[0086] Figure 2a Schematic diagram of the structure of the graphene thermal conductive gasket with an integral protective film edge according to Embodiment 2 of the present invention;

[0087] Figure 2b For Figure 2a sectional view;

[0088] Figure 2c Comparison diagram of the graphene thermal conductive gasket body without being covered by the protective film before and after deformation;

[0089] Figure 2c The right figure is a schematic structural diagram of the graphene thermal conductive gasket body without being covered by a protective film before deformation; Figure 2c The left figure is a schematic structural diagram of the graphene thermal conductive gasket body without being covered by a protective film after deformation;

[0090] Figure 2d It is a comparison diagram of the graphene thermal conductive gasket body covered by the protective film before and after deformation in Example 2; Figure 2d The right figure is a schematic structural diagram of the graphene thermal conductive gasket with an integrated protective film edge before deformation in Example 2; Figure 2d The left figure is a schematic structural diagram of the graphene thermal conductive gasket with an integrated protective film edge after deformation in Example 2;

[0091] Figure 2e It is a schematic diagram of the application scenario of the graphene thermal conductive gasket with an integrated protective film 2 edge provided in this Example 2;

[0092] Figure 2f It is a schematic diagram of the application scenario of the graphene thermal conductive gasket with a protective film edge in Example 2A;

[0093] Figure 2g It is a schematic diagram of the application scenario of the graphene thermal conductive gasket with a protective film edge in another case of Example 2B;

[0094] Figure 3a It is a schematic structural diagram of the graphene thermal conductive gasket with an integrated protective film edge in Embodiment 3 of the present invention;

[0095] Figure 3b For Figure 3a the sectional view;

[0096] Figure 4a It is a schematic structural diagram of the graphene thermal conductive gasket with a protective film edge in Embodiment 4 of the present invention;

[0097] Figure 4b For Figure 4a the sectional view;

[0098] Figure 5a It is a schematic structural diagram of the graphene thermal conductive gasket with a protective film edge in Embodiment 5 of the present invention;

[0099] Figure 5b For Figure 5a the sectional view. Detailed implementation manners

[0100] To further elaborate on the technical means and effects adopted by the present invention to achieve the predetermined purpose, the following, in combination with the accompanying drawings and preferred embodiments, details the specific implementation manners, methods, steps, structures, features, and effects of the positive electrode material proposed according to the present invention.

[0101] The foregoing and other technical contents, features and effects of the present invention will be clearly presented in the following detailed description of the preferred embodiments with reference to the accompanying drawings. Through the description of the specific embodiments, a more in-depth and specific understanding of the technical means and effects adopted by the present invention to achieve the predetermined purpose can be obtained. However, the accompanying drawings are only for reference and illustration, and are not used to limit the present invention.

[0102] The performance test methods of the following examples are as follows:

[0103] 1. Tensile strength:

[0104] Test method: GB / T 1040.2-2022, tensile speed 300 mm / min, specimen width 25 mm, specimen thickness 0.3 mm, the in-plane direction of graphene in the graphene thermal conductive gasket is perpendicular to the specimen length direction.

[0105] Test instrument: Universal testing machine, TSE254C

[0106] 2. Thermal resistance (K*cm 2 / W) at 10 PSI, 20 PSI, 30 PSI, 40 PSI

[0107] Test method: ASTM D5470, test temperature 80 degrees Celsius, test sample size 25*25 mm, thickness 0.3 mm, apply the corresponding pressure, after reaching the thermal steady state, obtain the corresponding thermal resistance value.

[0108] Test instrument: Thermal resistance analyzer, LW-9389

[0109] 3. Creep test:

[0110] Test method: GB / T 20671.5-2020, test sample size 25*25 mm, thickness 2 mm, keep under 50% compressive deformation for 1 hour, remove the pressure, and test the deformation size of the test sample.

[0111] Test instrument: Universal testing machine, TSE254C

[0112] 4. Insertion and extraction durability test

[0113] Test method: Execution standard: EIA-364-13D-2007

[0114] Insert and extract 50 times, detect the structural integrity of the thermal conductive gasket before and after insertion and extraction, and check for defects such as breakage, cracking, chipping, and scratches.

[0115] Test instrument: HF-5001 insertion and extraction force testing machine

[0116] Example 1: A Graphene Thermal Conductive Sheet with Protective Film Edging

[0117] In this Example 1, the side perimeter of the graphene thermal conductive sheet is coated with a protective film.

[0118] Please refer to Figure 1a and Figure 1b , a graphene thermal conductive sheet with protective film edging, comprising a graphene thermal conductive sheet body 1 and a protective film 2, and the perimeter of the side of the graphene thermal conductive sheet body 1 is covered within the protective film 2;

[0119] The preparation process of the graphene thermal conductive sheet with protective film edging in this Example includes the following steps:

[0120] Step 1: Attach the limiting device to the upper and lower surfaces of the graphene thermal conductive sheet body 1; the thickness of the graphene thermal conductive sheet body is 0.3 mm;

[0121] Step 2: Cut the graphene thermal conductive sheet body 1 with the limiting device on both the front and back according to the required size of the graphene thermal conductive sheet;

[0122] Step 3: Apply a material that can form a protective film, such as polyurethane, polysiloxane, styrene-butadiene latex, paraffin, polyethylene terephthalate, epoxy resin, polyethylene, acrylic resin, polyimide, to the perimeter of the side of the cut graphene thermal conductive sheet body 1 with the limiting device, wipe off the excess material, cure it, and form a protective film 2 on the perimeter of the side of the graphene thermal conductive sheet body 1;

[0123] Step 4: Remove the limiting devices on both the front and back of the graphene thermal conductive sheet body 1 to obtain a graphene thermal conductive sheet with the perimeter of the side wrapped with the protective film 2.

[0124] Comparative Example 1: The thickness of the unedged graphene thermal conductive sheet is 0.3 mm

[0125] After testing: The tensile strength of the unedged graphene thermal conductive sheet in Comparative Example 1 is 51 Kpa.

[0126] Table 1: Comparison Table of Tensile Strength between the Graphene Thermal Conductive Sheet with the Side Perimeter Coated with a Protective Film in Example 1 and the Unedged Graphene Thermal Conductive Sheet in Comparative Example 1

[0127] Example Protective film Tensile strength Example 1-1 Polyurethane 81KPa Example 1-2 Polysiloxane 79KPa Example 1-3 Styrene-butadiene latex 75KPa Example 1-4 Paraffin 72KPa Example 1-5 Polyethylene terephthalate 103KPa Example 1-6 Epoxy resin 112KPa Example 1-7 Polyethylene 98KPa Example 1-8 Acrylic resin 114KPa Example 1-9 Polyimide 132KPa Comparative 1-1 None 51Kpa

[0128] The test data in Table 1 show that after the side perimeter of the graphene thermal conductive sheet is coated with a protective film in Example 1, the tensile strength of the graphene thermal conductive sheet is significantly improved. The technical solution disclosed in Example 1 has a simple process, is easy to operate, has high mass production feasibility, and can prevent the graphene particles in the graphene thermal conductive sheet body from falling off.

[0129] Example 2: Graphene Thermal Conductive Gasket with an Integrated Protective Film Edge Wrapping

[0130] In this Example 2, the edges of the upper surface of the graphene thermal conductive gasket body, the edges of the lower surface of the graphene thermal conductive gasket body, and the side surfaces of the graphene thermal conductive gasket body are covered within the protective film.

[0131] Please refer to Figure 2a and Figure 2b , this Example 2 discloses a graphene thermal conductive gasket with an integrated protective film edge wrapping, including a graphene thermal conductive gasket body 1 and a protective film 2. The edges of the upper surface of the graphene thermal conductive gasket body 1, the edges of the lower surface of the graphene thermal conductive gasket body 1, and the side surfaces of the graphene thermal conductive gasket body 1 are covered within the protective film 2; the graphene thermal conductive gasket body 1 includes longitudinally arranged graphene, and the graphene penetrates the upper and lower surfaces of the graphene thermal conductive gasket body 1 to form a continuous thermal conductive structure. The protective film 2 is an integrated protective film 2. In this example, the width of the edges of the upper surface of the graphene thermal conductive gasket body 1 and the edges of the lower surface of the graphene thermal conductive gasket body 1 covered by the integrated protective film 2 is 0.2 mm.

[0132] The preparation method of the graphene thermal conductive gasket with an integrated protective film edge wrapping disclosed in this example includes the following steps:

[0133] Step (1), preparing part A: Die-cut the graphene thermal conductive gasket according to the required size;

[0134] Centrally press the limiting device on the upper and lower surfaces of the die-cut graphene thermal conductive gasket. The area of the limiting device is smaller than that of the graphene thermal conductive gasket, exposing the graphene thermal conductive gasket that needs to be edge-wrapped by the protective film 2 to obtain part A;

[0135] The graphene thermal conductive gasket body 1 that needs to be edge-wrapped by the protective film 2 includes:

[0136] The edges of the upper surface of the graphene thermal conductive gasket body 1;

[0137] The edges of the lower surface of the graphene thermal conductive gasket body 1;

[0138] The four sides of the side surface of the graphene thermal conductive gasket body 1;

[0139] The shape of the graphene thermal conductive gasket body 1 exposed that needs to be edge-wrapped by the protective film 2 is in the shape of a Chinese character 'hui';

[0140] Step (2), preparing part B: Cut the protective film 2 with a release film to obtain a protective film 2 frame that matches the shape and size of the graphene thermal conductive gasket body 1 that needs to be edge-wrapped by the protective film 2;

[0141] Step (ii): The exposed protective film 2 of part B is a "hui"-shaped integrated protective film 2. The width of the "hui"-shaped protective film = 2 * the width of the graphene thermal conductive gasket that needs to be edge-wrapped by the protective film + the thickness of the graphene thermal conductive gasket. In this way, the upper and lower surface edges of the "hui"-shaped graphene thermal conductive gasket in part A and the side surfaces of the graphene thermal conductive gasket can be covered at one time using the protective film 2 of part B, which is convenient and fast and improves efficiency.

[0142] The width of the protective film 2 conforms to the following relationship:

[0143] The width of the exposed "hui"-shaped protective film of part B = 2 * the width of the graphene thermal conductive gasket body that needs to be edge-wrapped by the protective film + the thickness of the graphene thermal conductive gasket body. In the actual application process, as long as this relationship is met, the cutting outer frame size and inner frame size of the protective film of part B can be any values.

[0144] In this embodiment, the width of the graphene thermal conductive gasket body 1 is 25 mm, the thickness of the graphene thermal conductive gasket body 1 is 0.3 mm, and the width of the graphene thermal conductive gasket that needs to be edge-wrapped by the protective film 2 is 0.2 mm.

[0145] In this embodiment, the width of the exposed "hui"-shaped protective film of part B = 2 * 0.2 mm of the width of the graphene thermal conductive gasket body 1 that needs to be edge-wrapped by the protective film + 0.3 mm of the thickness of the graphene thermal conductive gasket body 1 = 0.7 mm.

[0146] In this embodiment, the outer frame size of the protective film 2 of part B after cutting is 26 * 26 mm, and the inner frame size is 24.6 * 24.6 mm. In this way, it can be ensured that the width of the "hui"-shaped protective film is 0.7 mm, and the upper surface edge, lower surface edge, and the four sides of the side surface of the graphene thermal conductive gasket body 1 can be covered at one time using the protective film 2.

[0147] Step (iii): The edge of one surface of the protective film 2 frame covers the graphene thermal conductive gasket body:

[0148] Transfer part B to one surface of part A, with one side of the protective film 2 of part B facing the exposed surface of the graphene thermal conductive gasket body 1 of part A, and align and fit the protective film 2 of part B with the exposed graphene thermal conductive gasket body 1 of part A that needs to be edge-wrapped by the protective film 2; so that the protective film 2 is flat and tightly covers the exposed "hui"-shaped graphene thermal conductive gasket body 1 area of part A.

[0149] Step (iv): The edge of the side surface of the protective film 2 frame covers the side surface of the graphene thermal conductive gasket body 1 and the edge of the other surface of the graphene thermal conductive gasket body 1:

[0150] Press down the protective film 2, and fit part A to expose the side surface of the graphene thermal conductive gasket body 1 that needs to be edge-wrapped by the protective film 2. Then, bend the protective film 2 towards the other surface of the graphene thermal conductive gasket body 1 to fit the other surface of the graphene thermal conductive gasket body 1 at part A.

[0151] Step (v), apply pressure to the protective film 2 to make the protective film 2 fully fit part A, ensure that the thickness of the area of the graphene thermal conductive gasket body 1 covered by the protective film 2 is the same as the area of the graphene thermal conductive gasket body 1 not covered by the protective film 2, and there are no protrusions on the protective film 2. Remove the release film and remove the limiting device of part A to obtain a graphene thermal conductive gasket with an integrated protective film edge wrap. The edges and sides of the upper and lower surfaces of the graphene thermal conductive gasket with an integrated protective film edge wrap are covered by the protective film 2, effectively improving the strength of the graphene thermal conductive gasket; during application, the area of the upper surface of the graphene thermal conductive gasket body 1 covered by the protective film 2 and the area of the lower surface of the graphene thermal conductive gasket body 1 covered by the protective film 2 intervene in the interface between the heat source 5 and the radiator 4. The graphene thermal conductive gasket with an integrated protective film edge wrap is completely sealed between the heat source 5 and the radiator 4. There will be no air layer between the graphene thermal conductive gasket with an integrated protective film edge wrap and the heat source 5, and there will be no air layer between the graphene thermal conductive gasket with an integrated protective film edge wrap and the radiator 4, effectively ensuring the thermal conductivity of the graphene thermal conductive gasket with an integrated protective film edge wrap.

[0152] The proportion of the area of one surface of the graphene thermal conductive gasket body 1 covered by the protective film 2 to the area of one surface of the graphene thermal conductive gasket body 1 is 0.0% - 30%. For example, the proportion of the area of one surface of the graphene thermal conductive gasket body 1 covered by the protective film 2 to the area of one surface of the graphene thermal conductive gasket body 1 can also be 3.17%, 4.74%, 7.84%, 15.36%, 19.72%, 29.44%, etc., as shown in Table 2 for details.

[0153] Illustrate the calculation method of the proportion of the area of one surface of the graphene thermal conductive gasket body 1 covered by the protective film 2 to the area of one surface of the graphene thermal conductive gasket body 1:

[0154] In Example 2-1 in Table 2, the width of the edge of one surface of the graphene thermal conductive gasket body 1 covered by the integrated protective film 2 is 0.2 mm. Therefore, the area of the edge of one surface of the graphene thermal conductive gasket body covered by the integrated protective film 2 is

[0155] 25 mm * 25 mm - 24.6 mm * 24.6 mm = 19.84 mm 2 。

[0156] In Example 2-1, the width of the graphene thermal conductive gasket body is 25 mm, and the area of one surface of the graphene thermal conductive gasket body is 25 mm × 25 mm = 625 mm 2 .

[0157] In this Example 2-1, the proportion of the area of one surface of the graphene thermal conductive gasket body 1 covered by the protective film 2 to the area of one surface of the graphene thermal conductive gasket body 1 is

[0158] 19.84 mm 2 / 625 mm 2 ×100% = 3.17%.

[0159] Table 2: The proportion of the area of one surface of the graphene thermal conductive gasket body 1 covered by the protective film 2 to the area of one surface of the graphene thermal conductive gasket body 1.

[0160]

[0161]

[0162] Table 3: Comparison of thermal resistance and tensile strength of different proportions of the area of one surface of the graphene thermal conductive gasket body 1 covered by the protective film 2 in Example 2.

[0163]

[0164] In this Example 2, the upper, lower and side surfaces of the graphene thermal conductive gasket are simultaneously covered by an integral protective film method, with a complete structure, higher mechanical strength and simple process.

[0165] The tensile strength of the protective film adopted by the present invention is greater than the tensile strength of the graphene thermal conductive gasket body. For example, in this Example 2, the tensile strength of the protective film > 10 MPa, and the tensile strength of the graphene thermal conductive gasket body is 0.051 KPa. The elongation rate of the protective film adopted by the present invention under the same tensile force is less than the elongation rate of the graphene thermal conductive gasket body; for example, the elongation rate of the protective film in this Example < 1% under 200 KPa; the elongation rate of the graphene thermal conductive gasket body of the present invention is 5 - 10% under 200 KPa. The bonding force between the protective film adopted by the present invention and the graphene thermal conductive gasket > 300 g / 25 mm, and the bonding force is good.

[0166] Please refer to Figure 2c , in combination with Table 4, Figure 2c The right figure is a schematic structural diagram of the graphene thermal conductive gasket body 1 with a thickness of 2 mm before deformation without being covered by the protective film in Comparative Example 2; Figure 2cThe left figure shows the graphene thermal conductive gasket 1-1 after the graphene thermal conductive gasket without the edge being wrapped by the protective film in Comparative Example 2 is compressed and deformed by 50%; from Figure 2c It can be seen that, compared with the graphene thermal conductive gasket not coated with the protective film, the length of the graphene thermal conductive gasket 1-1 after being compressed and deformed by 50% becomes longer along the graphene arrangement direction. After testing: the maximum horizontal creep of the graphene thermal conductive gasket body 1 (with a thickness of 2 mm) in Comparative Example 2 without being coated with the protective film is 5 mm.

[0167] Please refer to Figure 2d , in combination with Table 4, Figure 2d The right figure is a schematic structural diagram of the graphene thermal conductive gasket with an integrated protective film edge in Example 2-12 before deformation; Figure 2d The left figure is a schematic structural diagram of the graphene thermal conductive gasket 1-2 after the graphene thermal conductive gasket with an integrated protective film edge in this Example 2-12 is compressed and deformed by 50%. From Figure 2d It can be seen that after the graphene thermal conductive gasket with an integrated protective film edge in this Example 2 is deformed, the length of the graphene thermal conductive gasket body 1 changes less along the graphene arrangement direction. After testing: the maximum horizontal creep of the graphene thermal conductive gasket with an integrated protective film edge in Example 2-12 is 0.4 mm.

[0168] When the graphene thermal conductive gasket with an integrated protective film edge in Example 2-12 encounters deformation, since the tensile strength of the protective film 2 is higher than that of the graphene thermal conductive gasket body 1, and the elongation rate of the protective film 2 is smaller than that of the graphene thermal conductive gasket body 1 under the same tensile force, the graphene thermal conductive gasket body is preferentially stressed; and because the protective film 2 adopted in the present invention is thinner, and the bonding force between the protective film 2 and the graphene thermal conductive gasket body 1 is high, the bonding force between the protective film 2 and the graphene thermal conductive gasket 1 > 300 g / 25 mm, and it will not be peeled off due to external entanglement; moreover, the protective film 2 in the present invention is an integrated protective film 2, the protective film 2 can deform with the deformation of the graphene thermal conductive gasket body 1, the graphene thermal conductive gasket body 1 will not be peeled off from the protective film 2, and the protective film 2 and the graphene thermal conductive gasket body 1 will not be delaminated. The graphene thermal conductive gasket with an integrated protective film edge in this Example 2 has a long service life and effectively ensures the heat conduction effect.

[0169] Table 4 Comparison table of the maximum horizontal creep (mm) in the horizontal direction when Example 2-12 and Comparative Example 2 are compressed by 50%

[0170] Example Maximum creep variable in the horizontal direction at 50% compression (mm) Comparative Example 2 5 Example 2-12 0.4

[0171] Please refer to Figure 2e , Figure 2eSchematic diagram of the application scenario of the graphene thermal conductive gasket with the integrated protective film 2 provided in this Embodiment 2. Starting from Figure 2e As can be seen, for the protective film 2 of the graphene thermal conductive gasket with the integrated protective film provided in this Embodiment 2, the protective film 2 is an integrated protective film 2. The area covered by the protective film 2 has the same thickness as the graphene thermal conductive gasket body 1. The protective film 2 does not bulge relative to the graphene thermal conductive gasket body 1. During actual application, the graphene thermal conductive gasket body 1 is in full contact with the lower surface of the radiator 4 and the upper surface of the heat source 5 (such as a chip), fitting tightly without an air layer, effectively ensuring the thermal conductivity of the graphene thermal conductive gasket body 1.

[0172] In summary, the technical solutions of this Embodiment 2 (including Embodiment 2-1 to Embodiment 2-12) have the following

[0173] Beneficial effects:

[0174] In Embodiment 2, the integrated protective film 2 is used to cover the graphene thermal conductive gasket body 1. Preferably, the proportion of the area of one surface of the graphene thermal conductive gasket body covered by the protective film to the area of one surface of the graphene thermal conductive gasket body is controlled within 8%. And the side surfaces of the graphene thermal conductive gasket body 1 are not covered by the protective film 2 at all. At the same time, the thickness of the protective film 2 is controlled within 5μm. The thickness of the area of the graphene thermal conductive gasket body 1 covered by the protective film 2 is the same as that of the area of the graphene thermal conductive gasket body 1 not covered by the protective film 2. At this time, the influence of the protective film 2 on the thermal resistance of the graphene thermal conductive gasket body 1 ≤ 0.01 Kcm 2 / W, within the test error range, realizing that on the premise of negligible influence on the thermal resistance of the graphene thermal conductive gasket body 1, the risk of the graphene thermal conductive gasket body 1 shedding slag is eliminated.

[0175] Strength improvement: The integrated protective film is used to cover the graphene thermal conductive gasket body 1. Compared with the graphene thermal conductive gasket without covering in Comparative Example 1, the weak edge strength of the graphene thermal conductive gasket covered by the integrated protective film in this Embodiment 2 is increased from 51 KPa to more than 300 KPa; the maximum horizontal creep amount under 50% compressive deformation is reduced from 5 mm to less than 0.5 mm.

[0176] High reliability: The integrated protective film 2 can deform with the deformation of the graphene thermal conductive gasket body 1, and the graphene thermal conductive gasket body 1 will not experience delamination.

[0177] Embodiment 2A

[0178] Preparation method of Embodiment 2A:

[0179] Place the graphene thermal conductive gasket body 1 in the wrapping frame 2-1. The thickness of the graphene thermal conductive gasket body 1 is 0.3 mm, and the thickness of the wrapping frame film 2-1 is 0.05 mm. There is a gap between the graphene thermal conductive gasket body 1 and the wrapping frame film 2-1, and the height of the gap is 0.1 mm. Use a dispensing machine to inject the adhesive into the gap between the wrapping frame 2-2 and the graphene thermal conductive gasket body 1, and then cure the graphene thermal conductive gasket body 1 with the applied glue.

[0180] Please refer to Figure 2f , Figure 2f Fig. is a schematic diagram of the application scenario of the graphene thermal conductive gasket with a protective film edge wrapping in Example 2A. It can be seen from the figure that in Example 2A, the graphene thermal conductive gasket body 1 is placed in the wrapping frame 2-1, and there is a gap between the wrapping frame 2-1 and the graphene thermal conductive gasket body 1. The gap is filled with an adhesive to connect the wrapping frame 2-1 and the graphene thermal conductive gasket body 1. In the application scenario of long-term pressure and high temperature, once the adhesive ages and fails, there is a risk that the wrapping frame 2-1 and the graphene thermal conductive gasket body 1 will separate, losing the effect of enhancing the structure of the graphene thermal conductive gasket body 1. In Example 2A, the width of the wrapping frame 2-1 exceeds the width of the graphene gasket body 1, and the electronic device needs to reserve space for the wrapping frame 2-1, which is not conducive to the miniaturization design of the chip 4; although the thickness of the wrapping frame 2-1 itself is less than that of the graphene thermal conductive gasket body 1, the total thickness of the edge-wrapped area after wrapping exceeds the thickness of the graphene thermal conductive gasket body 1. In the actual application process of the structure of Example 2A, especially in the low-pressure state, the graphene thermal conductive gasket body 1 is in a suspended state and cannot be in direct contact with the upper surface of the heat source 5 (such as a chip) and the lower surface of the radiator 4, and there is an air layer 6, which greatly affects the thermal conductivity of the graphene thermal conductive gasket body 1.

[0181] Example 2B

[0182] Please refer to Figure 2g , in Example 2B, the wrapping frame 2-2 does not intervene between the heat source 5 and the radiator 4. There is a problem of difficult positioning in the actual application process of the structure of Example 2B. At the same time, there are some areas of the graphene thermal conductive gasket body 1 that are not protected by the wrapping frame 2-2, as well as the upper and lower interfaces of the heat source 5 and the radiator 4. In the actual application process, there is a risk that the graphene thermal conductive gasket body 1 will be damaged and shed slag. As a conductive material, the graphene conductive particles shed during the application of the graphene thermal conductive gasket body 1 are likely to cause a short-circuit risk to the heat source 5 (such as a chip); at the same time, the wrapping frame 2-2 and the graphene thermal conductive gasket body 1 are connected by an adhesive. In the application scenario of long-term pressure and high temperature, once the adhesive ages and fails, there is a risk that the wrapping frame 2-2 and the graphene thermal conductive gasket body 1 will separate, losing the effect of enhancing the structure of the graphene thermal conductive gasket body 1.

[0183] The preparation method of Example 2B is the same as that of Example 2A.

[0184] Example 3 Graphene Thermal Conductive Gasket with an Integral Protective Film Edge

[0185] The graphene thermal conductive gasket with an integral protective film edge provided in this Example 3 is resistant to transverse shear force.

[0186] Please refer to Figure 3a and Figure 3b . The difference between Example 3 and Example 2 is that the edge of one surface of the graphene thermal conductive gasket body 1 and the side surface of the graphene thermal conductive gasket body 1 are covered in the protective film 2. The other surface of the graphene thermal conductive gasket body 1 is not covered by the protective film 2, but is directly attached to the application substrate 3 during application, for example, it can be attached to the application substrate through the protective film 2.

[0187] The overall width of the "hui" - shaped integral protective film 2 = the width of the graphene thermal conductive gasket that needs to be edge - wrapped by the protective film 2 + the thickness of the graphene thermal conductive gasket + the attachment width of the protective film 2 to the application substrate 3.

[0188] In this example, the width of the graphene thermal conductive gasket is 25 mm, the attachment width of the protective film 2 on the graphene thermal conductive gasket is 1 mm, the thickness of the graphene thermal conductive gasket is 0.3 mm, and the attachment width of the protective film 2 on the application substrate 3 is 1 mm.

[0189] The overall width of the "hui" - shaped integral protective film 2 = the width of the graphene thermal conductive gasket that needs to be edge - wrapped by the protective film 2 1 mm+the thickness of the graphene thermal conductive gasket 0.3 mm+the attachment width of the protective film 2 to the application substrate 3 1 mm = 2.3 mm. The protective film 2 completely fixes the surface of the graphene thermal conductive gasket and the surface of the application substrate 3 together.

[0190] In step four, the outer frame size of part B after cutting is 27.6 * 27.6 mm, and the inner frame size is 23 * 23 mm. Both the inner and outer frames are completely cut through to form the "hui" - shaped integral protective film 2.

[0191] In step four, press down the protective film 2 to attach it to part A, exposing the side surface of the graphene thermal conductive gasket body 1 that needs to be edge - wrapped by the protective film 2, and then bend the protective film 2 outwards to be parallel to the surface of the application substrate 3 and attach it to the surface of the application substrate 3.

[0192] In this embodiment, the width of the graphene thermal pad body 1 is 25 mm, the thickness of the graphene thermal pad body 1 is 0.3 mm, the width of the graphene thermal pad body 1 that needs to be wrapped with the protective film 2 is 1 mm, and the bonding width of the protective film 2 on the application substrate 3 is 1 mm. The protective film 2 is used to completely fix the surface of the graphene thermal pad body 1 and the surface of the application substrate 3 together.

[0193] In this embodiment 3, the width of the "U"-shaped integrated protective film 2 = the width of the graphene thermal conductive gasket body 1 that needs to be wrapped with the protective film 2 1mm + the thickness of the graphene thermal conductive gasket body 1 0.3mm + the fitting width of the protective film 2 and the application substrate 3 1mm = 2.3mm.

[0194] The graphene thermal conductive gasket with integrated protective film edge wrapping provided in Example 3 was subjected to a plugging and unplugging durability test, and was found to withstand plugging and unplugging for more than 50 times. Based on the calculation that the equipment is maintained once a year, the graphene thermal conductive gasket with integrated protective film edge wrapping in Example 3 has a lifespan of at least 50 years. However, the graphene thermal conductive gasket without edge wrapping in Comparative Example 1 would be damaged after being plugged and unplugged 1-2 times.

[0195] Embodiment 3 uses a protective film 2 to simultaneously cover the surface of the graphene thermal pad body 1 and the surface of the application substrate 3, to prevent the graphene thermal pad from falling off during the application process, and also to provide initial adhesion for easy placement. The integrated protective film 2 tightly combines the graphene thermal pad body 1 and the application substrate 3 together, and at the same time forms a protective film transition layer on the graphene thermal pad body 1 and the upper surface of the application substrate 3. The excellent strength and low friction coefficient of the protective film 2 can prevent the edge of the graphene thermal pad body 1 from curling or breaking when subjected to lateral shear force. This embodiment 3 connects the graphene thermal pad and the application substrate through a protective film, provides positioning capability, facilitates automated placement, and prevents the graphene thermal pad from cracking or curling from the edge when subjected to lateral shear force.

[0196] Example 4: Graphene thermally conductive pad with integrated protective film

[0197] The graphene thermal conductive gasket with an integrated protective film edge provided in this embodiment 4 can adjust the placement position.

[0198] Please refer to Figure 4a and Figure 4b In this embodiment, the orientation direction of graphene refers to the stacking direction of the graphene layers in the graphene thermal pad body 1. In Embodiment 4, for the two edges of the graphene thermal pad body 1 in the graphene orientation direction, the coating method of Embodiment 2 is adopted; that is, for the two edges of the graphene thermal pad body 1 in the graphene orientation direction, the graphene thermal pad body 1 wrapped with the protective film 2 includes:

[0199] The upper surface of the edge of the graphene thermal conductive gasket body 1 in the graphene orientation direction;

[0200] The lower surface of the edge of the graphene thermal conductive gasket body 1 in the graphene orientation direction;

[0201] And the two side surfaces of the graphene thermal conductive gasket body 1 in the graphene orientation direction;

[0202] For the two edges of the graphene thermal conductive gasket body 1 in the graphene orientation direction: The width of the "return" - shaped integrated protective film in the graphene orientation direction is equal to 2 times the width of the graphene thermal conductive gasket body 1 that needs to be edge - wrapped by the protective film + the thickness of the graphene thermal conductive gasket body 1.

[0203] For the edges of the graphene thermal conductive gasket body 1 perpendicular to the graphene orientation direction, the wrapping method of Embodiment 3 is adopted; that is, for the two edges of the graphene thermal conductive gasket body 1 perpendicular to the graphene orientation direction, the graphene thermal conductive gasket body 1 edge - wrapped by the protective film 2 includes:

[0204] The upper surface of the edge of the graphene thermal conductive gasket body 1 perpendicular to the graphene orientation direction,

[0205] And the two side surfaces of the graphene thermal conductive gasket body 1 perpendicular to the graphene orientation direction;

[0206] The lower surface of the edge of the graphene thermal conductive gasket body 1 perpendicular to the graphene orientation direction is attached to the application substrate 3.

[0207] For the edges, side surfaces of the graphene thermal conductive gasket body 1 perpendicular to the graphene orientation direction and the application substrate 3, the width of the "return" - shaped integrated protective film 2 used = the width of the graphene thermal conductive gasket body 1 that needs to be edge - wrapped by the protective film 2 + the thickness of the graphene thermal conductive gasket body 1 + the fitting width of the protective film 2 and the application substrate 3.

[0208] In this Embodiment 4, the width of the graphene thermal conductive gasket body 1 is 25 mm, the width of the protective film 2 wrapping the graphene thermal conductive gasket body 1 is 0.5 mm, the thickness of the graphene thermal conductive gasket body 1 is 0.3 mm, and the fitting width of the protective film 2 on the application substrate 3 is 1 mm.

[0209] The width of the "hui"-shaped integrated protective film 2 in the graphene orientation direction = the width of the graphene thermal conductive gasket body 1 that needs to be edge-wrapped by the protective film 2, 0.5 mm * 2 + the thickness of the graphene thermal conductive gasket body 1, 0.3 mm = 1.3 mm. The width of the "hui"-shaped integrated protective film in the direction perpendicular to the graphene orientation direction = the width of the graphene thermal conductive gasket body 1 that needs to be edge-wrapped by the protective film 2, 0.5 mm + the thickness of the graphene thermal conductive gasket body 1, 0.3 mm + the bonding width between the protective film 2 and the application substrate 3

[0210] 1 mm = 1.8 mm.

[0211] In step four, the outer frame size of part B after cutting is 26.6 * 27.6 mm, and the inner frame size is 24 * 24 mm. The inner frame and the outer frame are all cut through to form the "hui"-shaped integrated protective film 2; in this embodiment, the inner frame of the "hui"-shaped integrated protective film 2 is a square, and the outer frame is a rectangle.

[0212] For the edges and sides of the graphene thermal conductive gasket body 1 in the graphene orientation direction, the process of Embodiment 2 is used for coating; the two sides of the wide edge of the outer frame of the protective film 2 are used for coating the edges and sides of the graphene thermal conductive gasket body 1 in the graphene orientation direction.

[0213] For the edges and sides of the graphene thermal conductive gasket body 1 perpendicular to the graphene orientation direction, and the application substrate 3, the process of Embodiment 3 is used for coating. The two sides of the long edge of the outer frame of the protective film 2 are used for coating the edges and sides of the graphene thermal conductive gasket body 1 perpendicular to the graphene orientation direction, and the application substrate 3. The specific process is as follows:

[0214] A preparation method of a graphene thermal conductive gasket with a protective film edge wrap, characterized by comprising:

[0215] Step (1), preparing part A: Die-cut the graphene thermal conductive gasket body according to the required size;

[0216] Press the limiting device in the middle on the upper surface and the lower surface of the die-cut graphene thermal conductive gasket body 1. The area of the limiting device is less than or equal to that of the graphene thermal conductive gasket body 1, exposing the graphene thermal conductive gasket body that needs to be edge-wrapped by the protective film to obtain part A;

[0217] Step (2), preparing part B: Pre-prepare the protective film on the surface of the release film, cut the protective film with the release film, and obtain a protective film frame that matches the shape and size of the graphene thermal conductive gasket body that needs to be edge-wrapped by the protective film;

[0218] Step (3), for the two edges of the graphene thermal conductive gasket body 1 in the graphene orientation direction, the protective film is coated in sequence:

[0219] The upper surface of the edge of the graphene thermal conductive gasket body 1 in the graphene orientation direction;

[0220] The side surface of the graphene thermal conductive gasket body 1 in the graphene orientation direction;

[0221] And the lower surface of the edge of the graphene thermal conductive gasket body 1 in the graphene orientation direction;

[0222] Step (iv), for the two edges of the graphene thermal conductive gasket body 1 perpendicular to the graphene orientation direction, the protective film sequentially covers:

[0223] The upper surface of the edge of the graphene thermal conductive gasket body 1 perpendicular to the graphene orientation direction,

[0224] And the side surface of the graphene thermal conductive gasket body 1 perpendicular to the graphene orientation direction;

[0225] The lower surface of the edge of the graphene thermal conductive gasket body 1 perpendicular to the graphene orientation direction is attached to the application substrate;

[0226] Step (v), apply pressure on the protective film so that the thickness of the area of the graphene thermal conductive gasket body covered by the protective film is the same as the area of the graphene thermal conductive gasket body not covered by the protective film, make the protective film fully fit part A, remove the release film, and remove the limiting device of part A to obtain a graphene thermal conductive gasket with a protective film edge.

[0227] In Example 4, the protective film 2 covers the weakest directions of the graphene thermal conductive gasket body 1, that is, the upper and lower surfaces and the side surfaces of the two edges in the graphene orientation direction, to prevent the graphene thermal conductive gasket body 1 from cracking and chipping along the graphene orientation direction during application; compared with Example 3, the protective film fits more tightly and firmly with the graphene thermal conductive gasket body 1; and it can be repeatedly pasted and the pasting position can be adjusted. In Example 4, the protective film 2 on both sides perpendicular to the graphene orientation direction is attached to the surface of the application substrate 3. Compared with Example 2, Example 4 provides initial adhesion without affecting the thermal resistance of the graphene thermal conductive gasket body 1, facilitating the positioning and pasting of the graphene thermal conductive gasket. The integrated protective film 2 can tightly combine the graphene thermal conductive gasket body 1 and the application substrate 3.

[0228] Example 5

[0229] Example 5 A graphene thermal conductive gasket with a protective film edge

[0230] Example 5 is an improved solution based on Example 2, Example 2A, Example 2B, and Example 3. Please refer to Figure 5a And Figure 5b, Embodiment 5 provides a graphene thermal conductive gasket with a protective film edge wrapping. The graphene thermal conductive gasket with a protective film edge wrapping includes a graphene thermal conductive gasket body 1, a first protective film 2-1, and a second protective film 2-2. The first protective film 2-1 sequentially wraps the edges of the upper surface of the graphene thermal conductive gasket body 1, the side surface of the graphene thermal conductive gasket body 1, and the edges of the lower surface of the graphene thermal conductive gasket body 1; the second protective film 2-2 wraps the upper surface of the first protective film 2-1 and extends to wrap a part of the graphene thermal conductive gasket body 1; the second protective film 2-2 wraps the side surface of the first protective film 2-1 and the upper surface of the application substrate 3.

[0231] Both the first protective film 2-1 and the second protective film 2-2 are integral protective films 2; the graphene thermal conductive gasket body 1 includes longitudinally arranged graphene, and the graphene penetrates the upper and lower surfaces of the graphene thermal conductive gasket body 1 to form a continuous heat conduction structure.

[0232] In Embodiment 5, the width of the graphene thermal conductive gasket body is 25 mm, the thickness of the graphene thermal conductive gasket body is 0.3 mm, the width of the edge of the upper surface of the graphene thermal conductive gasket body 1 wrapped by the first protective film 2-1 is 0.3 mm, and the width of the edge of the lower surface of the graphene thermal conductive gasket body 1 wrapped by the first protective film 2-1 is 0.5 mm.

[0233] In Embodiment 5, the second protective film 2-2 wraps the upper surface of the first protective film 2-1 and extends to wrap a part of the upper surface edge of the graphene thermal conductive gasket body 1, with a total width of 0.5 mm; the fitting width of the second protective film 2-2 and the application substrate 3 is 1 mm.

[0234] The preparation method of the graphene thermal conductive gasket with an integral protective film edge wrapping in Embodiment 5 includes the following steps:

[0235] First, refer to the preparation method of the graphene thermal conductive gasket in Embodiment 2 to cut the first protective film 2-1.

[0236] The first protective film 2-1 is cut into a "hui" character shape. After cutting, the width of the first protective film 2-1 = the width of the upper surface of the graphene thermal conductive gasket that needs to be wrapped with the protective film 0.3 mm + the thickness of the graphene thermal conductive gasket 0.3 mm + the width of the lower surface of the graphene thermal conductive gasket that needs to be wrapped with the protective film 0.5 mm = 1.1 mm.

[0237] After cutting, the outer frame size of the first protective film 2-1 is 26.6 * 26.6 mm, and the inner frame size is 24.4 * 24.4 mm. Both the inner and outer frames are completely cut through to form an integral "hui" character shaped first protective film 2-1.

[0238] After the coating of the first protective film 2 - 1 is completed, the first protective film 2 - 1 is coated according to the preparation method of Example 2.

[0239] Then, the side of the graphene thermal conductive gasket covered by the first protective film 2-1 with a width of 0.3 mm faces upward, and the side of the graphene thermal conductive gasket covered by the first protective film 2-1 with a width of 0.5 mm faces the application substrate 3, and the second protective film 2-2 is cut and coated according to the steps of Example 3.

[0240] Refer to Example 3 to cut the second protective film 2-2. After cutting, the dimensions of the second protective film 2-2 are an outer frame dimension of 27.6*27.6mm and an inner frame dimension of 24*24mm. The inner and outer frames are all cut through to form an integrated second protective film 2-2 in the shape of a Chinese character "U". The width of the second protective film 2-2 after cutting = the upper surface width of the graphene thermal conductive pad that needs to be wrapped with the second protective film 2-2 0.5mm + the thickness of the graphene thermal conductive pad 0.3mm + the fitting width of the second protective film 2 and the application substrate 1.0mm = 1.8mm.

[0241] After the cutting is completed, the second protective film 2-2 is sequentially coated on the upper surface of the first protective film 2-1, the side of the first protective film 2-1 and the application substrate 3 with reference to Example 3. The second protective film 2-2 covers the first protective film 2-1 and extends a portion to cover the graphene thermal pad body 1, so that the upper surface edge and the lower surface edge of the graphene thermal pad body 1 are coated with the same width, both of which are 0.5 mm.

[0242] The integrated protective film-wrapped graphene thermal pad provided in Example 5 combines the advantages of the protective film-wrapped graphene thermal pad of Example 2 and the protective film-wrapped graphene thermal pad of Example 3, enhances the structural strength of the graphene thermal pad, improves the resistance to lateral shear force, and provides adhesion, so that the graphene thermal pad has repeated adhesion, while ensuring the integrity of the graphene thermal pad structure during repeated mounting, avoiding the risk of slag falling off during repeated mounting of the graphene thermal pad.

[0243] The above is only a preferred embodiment of the invention and does not limit the invention in any form. Although the invention has been disclosed as a preferred embodiment as above, it is not used to limit the invention. Any technician familiar with the profession can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the invention without departing from the content of the technical solution of the invention still fall within the scope of the technical solution of the invention.

Claims

1. A graphene thermal conductive gasket with a protective film edge wrapping, characterized in that, It includes a graphene thermal conductive gasket body and a protective film, and the protective film covers the graphene thermal conductive gasket body.

2. The graphene thermal conductive gasket with a protective film edge as described in claim 1, wherein The graphene thermal conductive gasket body includes longitudinally arranged graphene, and the graphene penetrates through the upper and lower surfaces of the graphene thermal conductive gasket body to form a continuous thermal conductive structure.

3. The graphene heat-conducting gasket with a protective film edge as described in claim 1 or 2, characterized in that, The protective film is an integral protective film.

4. The graphene thermal conductive gasket with a protective film edge as claimed in claim 3, wherein, The protective film is a "hui" - shaped integral protective film.

5. The graphene thermal conductive gasket with a protective film edge as described in claim 1, characterized in that The protective film is a protective film formed by curing polyurethane, polysiloxane, styrene - butadiene latex, paraffin, polyethylene terephthalate, epoxy resin, polyethylene, acrylic resin, or polyimide.

6. The graphene thermal conductive gasket with a protective film edge as claimed in any one of claims 1 to 4, wherein The edges of the upper surface of the graphene thermal conductive gasket body, the edges of the lower surface of the graphene thermal conductive gasket body, and the side surface of the graphene thermal conductive gasket body are covered within the protective film.

7. The graphene thermal conductive gasket with a protective film edge as claimed in any one of claims 1 to 4, wherein The edge of one surface of the graphene thermal conductive gasket body and the side surface of the graphene thermal conductive gasket body are covered within the protective film, and the other surface of the graphene thermal conductive gasket body is attached to the application substrate through the protective film extending to the surface of the application substrate.

8. The graphene thermal conductive gasket with a protective film edge according to any one of claims 1-7, characterized in that, The thickness range of the protective film is 1 - 30 microns.

9. The graphene thermal conductive gasket with a protective film edge as described in any one of claims 1-8, characterized in that The proportion of the area of one surface of the graphene thermal conductive gasket body covered by the protective film to the area of one surface of the graphene thermal conductive gasket body is 0.0% - 30%.

10. The graphene thermal conductive gasket with a protective film edge as claimed in any one of claims 1-9, characterized in that The thickness of the area of the graphene thermal conductive gasket body covered by the protective film is the same as the thickness of the area of the graphene thermal conductive gasket body not covered by the protective film.

11. The graphene thermal conductive gasket with a protective film edge as claimed in any one of claims 1-10, characterized in that, The tensile strength of the protective film is greater than the tensile strength of the graphene thermal conductive gasket body.

12. The graphene thermal conductive gasket with a protective film edge as claimed in any one of claims 1-11, characterized in that, Under the same tensile force, the elongation rate of the protective film is less than the elongation rate of the graphene thermal conductive gasket body.

13. The graphene thermal conductive gasket with a protective film edge as described in any one of claims 1-12, characterized in that, The bonding force between the protective film and the graphene thermal conductive gasket body is ≥ 100 g / 25 mm.

14. A preparation method of a graphene heat-conducting gasket with a protective film edge wrapping, characterized in that, It includes: Step (1), preparing part A: Die - cut the graphene thermal conductive gasket body according to the required size; Centrally press a limiting device on the upper and lower surfaces of the die - cut graphene thermal conductive gasket body. The area of the limiting device is less than or equal to that of the graphene thermal conductive gasket body, exposing the graphene thermal conductive gasket body that needs to be edge - wrapped by the protective film to obtain part A; Step (2), preparing part B: Pre - fabricate the protective film on the surface of a release film, cut the protective film with the release film, and obtain a protective film border that matches the shape and size of the graphene thermal conductive gasket body that needs to be edge - wrapped by the protective film; Step (3), the protective film border covers the edge of one surface of the graphene thermal conductive gasket body; Step (4), the protective film border covers the side surface of the graphene thermal conductive gasket body and the edge of the other surface; Step (5), apply pressure on the protective film to make the thickness of the area of the graphene thermal conductive gasket body covered by the protective film the same as the thickness of the area of the graphene thermal conductive gasket body not covered by the protective film, make the protective film fully adhere to part A, remove the release film, and remove the limiting device of part A to obtain a graphene thermal conductive gasket with a protective film edge - wrap.

15. A method for preparing a graphene thermal conductive gasket with a protective film edge - wrap as described in claim 14, characterized in that, In step (1), the graphene thermal conductive gasket body that needs to be edge - wrapped by the protective film includes: The edge of the upper surface of the graphene thermal conductive gasket body, The periphery of the side surface of the graphene thermal conductive gasket body. The protective film also covers the surface of the application substrate.

16. A preparation method of a graphene thermal conductive gasket with a protective film edge wrapping, characterized in that, Including: Step (1), preparing part A: Die-cut the graphene thermal conductive gasket body according to the required size; Centrally press the limiting device on the upper surface and the lower surface of the die-cut graphene thermal conductive gasket body. The area of the limiting device is less than or equal to that of the graphene thermal conductive gasket body, exposing the graphene thermal conductive gasket body that needs to be edge-wrapped by the protective film, and obtaining part A; Step (2), preparing part B: Pre-prepare the protective film on the surface of the release film, cut the protective film with the release film, and obtain a protective film frame that matches the shape and size of the graphene thermal conductive gasket body that needs to be edge-wrapped by the protective film; Step (3), the protective film frame wraps the edge of one surface of the graphene thermal conductive gasket body; Step (4), the protective film frame wraps the side surface of the graphene thermal conductive gasket body, press down the protective film 2, fit the side surface of the graphene thermal conductive gasket body 1 exposed in part A that needs to be edge-wrapped by the protective film, and then bend the protective film outwards to be parallel to the surface of the application substrate and fit the surface of the application substrate; Step (5), apply pressure on the protective film to make the thickness of the area of the graphene thermal conductive gasket body covered by the protective film the same as the area of the graphene thermal conductive gasket body not covered by the protective film, make the protective film completely fit part A, remove the release film, and remove the limiting device of part A to obtain a graphene thermal conductive gasket with a protective film edge wrap.

17. The graphene thermal conductive gasket with a protective film edge as claimed in claim 1, wherein, The graphene thermal conductive gasket body is composed of a horizontally arranged graphene structure.

18. The graphene thermal conductive gasket with a protective film edge as described in claim 1, wherein, The protective film is one or more layers of protective films.

19. A radiator, characterized in that, The heat sink includes a heat sink and a thermal conductive gasket covering the bottom surface of the heat sink, and the thermal conductive gasket is the graphene thermal conductive gasket with a protective film edge wrap according to any one of claims 1-18.

20. A chip packaging structure, characterized in that, The chip packaging structure includes a semiconductor chip and a thermal conductive gasket covering the semiconductor chip, and the thermal conductive gasket is the graphene thermal conductive gasket with a protective film edge wrap according to any one of claims 1-18.

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