Continuous carbon fiber silica gel thermal interface material and preparation method thereof

Abstract

The invention relates to a continuous carbon fiber silica gel thermal interface material and a preparation method thereof, and the preparation method of the continuous carbon fiber silica gel thermal interface material is characterized in that the continuous carbon fiber silica gel thermal interface material is finally prepared by taking a carbon fiber bundle in a plurality of rolls of carbon fiber yarn shafts as a starting point through eight steps, and carbon fiber monofilaments in the continuous carbon fiber silica gel thermal interface material are distributed in the same direction. In the continuous carbon fiber silica gel thermal interface material, all carbon fibers are parallel in the thickness direction of the continuous carbon fiber silica gel thermal interface material; and the length of each carbon fiber is the same as the thickness of the continuous carbon fiber silica gel thermal interface material, so that the transfer path of heat along the carbon fibers in the heat dissipation process is shortest, and the axial heat-conducting property of the carbon fibers is maximized. The carbon fibers in the continuous carbon fiber silica gel thermal interface material are all in the same direction and are continuous, so that the heat dissipation performance of the continuous carbon fiber silica gel thermal interface material can be greatly improved.

Description

Technical Field

[0001] The present invention relates to the field of material science and engineering technology, and in particular to a continuous carbon fiber silicone thermal interface material and a preparation method thereof. Background Art

[0002] With the rapid development of the electronic information industry, especially the rapid development of 5G informatization, the power of semiconductor chip devices has greatly increased. The highly integrated operation of electronic components generates a large amount of heat. The thermal conductivity of existing thermal conductive materials is no longer sufficient to meet the chip's heat dissipation requirements, directly affecting the service life and operating efficiency of electronic components. Thermal interface materials (TIMs) are materials used to improve heat transfer in electronic devices. Typically, TIMs are placed between heat-generating chips or electronic components and heat-dissipating substrates or heat-dissipating devices to reduce their contact thermal resistance. The primary function of these materials is to provide an efficient heat conduction path between the heat-generating component and the heat sink, thereby enhancing thermal coupling and optimizing heat transfer. Silicone, with its unique properties such as excellent elasticity, a wide operating temperature range (-40°C to 250°C), low modulus, high damping capacity, light weight, easy processing, and low cost, is widely used in thermal interface materials. However, pure silicone has low thermal conductivity and requires filling with various high-conductivity materials to improve its thermal conductivity.

[0003] Currently, most carbon fiber silicone materials use chopped carbon fibers, which initially appear as randomly dispersed fillers. Even with various methods, it's difficult to achieve axial alignment of all the carbon fibers. For example, magnetic field orientation and flow channel orientation methods, for example, are inefficient and unsuitable for large-scale industrial applications, while flow channel orientation methods struggle to achieve a good degree of orientation. Consequently, the thermal conductivity of carbon fiber silicone materials is low, failing to fully utilize the carbon fibers' axial thermal conductivity.

[0004] Therefore, in view of the shortcomings of the existing technology, it is necessary to provide a continuous carbon fiber silicone thermal interface material and a preparation method thereof to solve the shortcomings of the existing technology. Summary of the Invention

[0005] The first object of the present invention is to provide a method for preparing a continuous carbon fiber silicone thermal interface material, thereby overcoming the shortcomings of the prior art. This method produces a continuous carbon fiber silicone thermal interface material in which all carbon fibers are parallel to the thickness of the silicone sheet and are continuous. During heat dissipation, the heat transfer path along the carbon fibers is minimized, maximizing the axial thermal conductivity of the carbon fibers.

[0006] The above-mentioned purpose of the present invention is achieved through the following technical measures: A method for preparing a continuous carbon fiber silicone thermal interface material is provided, comprising the following steps: S1. Pulling out the ends of the carbon fiber bundles from the multiple carbon fiber yarn spools and arranging them transversely into a yarn arrangement consisting of multiple carbon fiber bundles, wherein the carbon fiber bundles are uninterrupted in the axial direction in the yarn arrangement; each carbon fiber yarn spool is wound by winding a single carbon fiber bundle, and each carbon fiber bundle is composed of multiple carbon fiber monofilaments; S2, widening the yarn obtained in S1 to obtain a laterally dispersed gauze; S3, immersing the gauze obtained in S2 into liquid silicone to obtain a carbon fiber silicone cloth attached with liquid silicone; S4, semi-curing the carbon fiber silicone cloth obtained in S3 to obtain a carbon fiber silicone prepreg; S5, cutting the carbon fiber silicone prepreg obtained in S4 into multiple prepreg unit sheets; S6, stacking multiple prepreg unit sheets obtained in S5, with the carbon fiber monofilaments in each prepreg unit sheet being parallel to the carbon fiber monofilaments in other prepreg unit sheets, to obtain a carbon fiber silicone block formed by stacking multiple prepreg unit sheets; S7, curing the carbon fiber silicone block to obtain a cured carbon fiber silicone block; S8, cutting the cured carbon fiber silicone block obtained in S7 along a direction perpendicular to the axial direction of the internal carbon fibers to obtain the continuous carbon fiber silicone thermal interface material.

[0007] Preferably, the above S1 is specifically to install multiple carbon fiber spools on a creel, and then pull out the ends of the carbon fiber bundles in the multiple carbon fiber spools and arrange them into the yarn arrangement through a yarn arrangement device.

[0008] Preferably, the above S2 specifically widens the yarn obtained in S1 through a yarn spreading device, so that the multiple carbon fiber monofilaments in the carbon fiber bundle are spread horizontally, thereby filling the gaps between adjacent carbon fiber bundles to obtain a horizontal gauze.

[0009] Preferably, the above S3 specifically comprises immersing the gauze obtained in S2 into a dipping tank pre-placed with liquid silicone to obtain the carbon fiber silicone cloth attached with liquid silicone.

[0010] Preferably, the above S4 is specifically to semi-cure the carbon fiber silicone cloth obtained in S3 to obtain a carbon fiber silicone prepreg, and then tow the carbon fiber silicone prepreg through a traction device, and then the carbon fiber silicone prepreg enters the film unwinding device, so that the lower surface and the upper surface of the carbon fiber silicone prepreg are covered with a protective film, and finally the carbon fiber silicone prepreg is towed to the winding device for winding.

[0011] Preferably, the above S5 specifically involves cutting the carbon fiber silicone prepreg sheet obtained in S4 into prepreg unit sheets by a cutting machine.

[0012] Preferably, the above S6 specifically removes the protective films on the upper and lower surfaces of the prepreg unit sheet, and then stacks multiple pieces of the prepreg unit sheet, and the carbon fiber filaments in each prepreg unit sheet are parallel to the carbon fiber filaments in other prepreg unit sheets, to obtain a carbon fiber silicone block formed by stacking multiple pieces of the prepreg unit sheets.

[0013] Preferably, the above S4 is specifically semi-curing the carbon fiber silicone cloth obtained in S3 through a semi-curing drying tunnel to obtain a carbon fiber silicone prepreg.

[0014] Preferably, the above S7 is specifically performed by pressurizing, heating and curing the carbon fiber silicone block in a hot pressing curing furnace.

[0015] Preferably, the above S8 specifically involves cutting the cured carbon fiber silicone block obtained in S7 along a direction perpendicular to the axial direction of the internal carbon fibers by a slicer to obtain the continuous carbon fiber silicone thermal interface material.

[0016] Preferably, the width of the prepreg unit sheet is 300 mm to 1500 mm.

[0017] Preferably, the thickness of the prepreg unit sheet is 0.1 mm to 0.5 mm.

[0018] Preferably, the length of the prepreg unit sheet is 300 mm to 1500 mm.

[0019] A second objective of the present invention is to provide a continuous carbon fiber silicone thermal interface material that overcomes the shortcomings of the prior art. The carbon fibers in this continuous carbon fiber silicone thermal interface material are all parallel to the thickness of the silicone sheet and are continuous. During heat dissipation, the heat transfer path along the carbon fibers is minimized, maximizing the axial thermal conductivity of the carbon fibers.

[0020] The above-mentioned purpose of the present invention is achieved through the following technical measures: Provided is a continuous carbon fiber silicone thermal interface material, which is prepared by the above-mentioned preparation method of the continuous carbon fiber silicone thermal interface material.

[0021] The present invention relates to a continuous carbon fiber silicone thermal interface material and a preparation method thereof, wherein the preparation method of the continuous carbon fiber silicone thermal interface material comprises the following steps: S1, pulling out the ends of the carbon fiber bundles in multiple carbon fiber yarn shafts, arranging them laterally into a yarn arrangement consisting of multiple carbon fiber bundles, and the carbon fiber bundles are uninterrupted in the axial direction in the yarn arrangement; each carbon fiber yarn shaft is wound by a single carbon fiber bundle, and each carbon fiber bundle is composed of multiple carbon fiber monofilaments; S2, widening the yarn arrangement obtained in S1 to obtain a laterally dispersed gauze; S3, immersing the gauze obtained in S2 in liquid silicone to obtain a carbon fiber silicone cloth attached with liquid silicone; S4, The carbon fiber silicone cloth obtained is semi-cured to obtain a carbon fiber silicone prepreg; S5, the carbon fiber silicone prepreg obtained in S4 is cut into multiple prepreg unit sheets; S6, multiple prepreg unit sheets obtained in S5 are stacked, and the carbon fiber filaments in each prepreg unit sheet are parallel to the carbon fiber filaments in other prepreg unit sheets, to obtain a carbon fiber silicone block stacked by multiple prepreg unit sheets; S7, the carbon fiber silicone block is cured to obtain a cured carbon fiber silicone block; S8, the cured carbon fiber silicone block obtained in S7 is cut along a direction perpendicular to the axial direction of the internal carbon fiber to obtain the continuous carbon fiber silicone thermal interface material. In the continuous carbon fiber silicone thermal interface material of the present invention, all carbon fibers are parallel to the thickness direction of the continuous carbon fiber silicone thermal interface material; and the length of each carbon fiber is the same as the thickness of the continuous carbon fiber silicone thermal interface material, so the heat transfer path along the carbon fiber is the shortest during the heat dissipation process, and the axial thermal conductivity of the carbon fiber is maximized. Compared with the chopped carbon fiber fillers in the prior art, these chopped carbon fibers are difficult to meet all orientations, and these chopped carbon fibers cannot be continuous and uninterrupted. Since the carbon fibers in the continuous carbon fiber silicone thermal interface material of the present invention are all oriented in the same direction and continuous, its heat dissipation performance can be greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The present invention is a flow chart of a method for preparing a continuous carbon fiber silicone thermal interface material.

[0023] Figure 2 Schematic diagram of cutting carbon fiber silicone prepreg into prepreg unit sheets.

[0024] Figure 3 Schematic diagram of multiple prepreg unit sheets stacked into a carbon fiber silicone block.

[0025] Figure 4 Schematic diagram of cutting the cured carbon fiber silicone block into continuous carbon fiber silicone thermal interface material.

[0026] Figure 5 Schematic diagram of the structure of continuous carbon fiber silicone thermal interface material.

[0027] Figure 6 Schematic diagram of S1 to S4 of Example 2.

[0028] Figure 7 for Figure 6 Schematic diagram from another angle.

[0029] Figure 8 Schematic diagram of S5 to S8 of Example 2.

[0030] exist Figures 1 to 8 Including: Continuous carbon fiber silicone thermal interface material 100, silicone 101, carbon fiber bundle 102, carbon fiber silicone cloth 103, carbon fiber silicone prepreg 104, carbon fiber silicone block 105, prepreg unit sheet 106, Creel 200, yarn arrangement device 300, yarn spreading device 400, glue dipping tank 500, traction device 600, film unwinding device 700, cutting machine 800, hot press curing furnace 900, slicer 1000, carbon fiber yarn shaft 1100, semi-curing drying tunnel 120. DETAILED DESCRIPTION

[0031] The technical solutions of the present invention are further illustrated with reference to the following examples. The experimental methods in the following examples are conventional methods unless otherwise specified. The raw materials, reagents, etc. used in the following examples can be purchased from conventional biochemical reagent stores or pharmaceutical companies unless otherwise specified.

[0032] Example 1: A method for preparing a continuous carbon fiber silicone thermal interface material, such as Figure 1 The steps include: S1. Pull out the ends of the carbon fiber bundles 102 from the multiple carbon fiber yarn spools 1100 and arrange them transversely into a yarn arrangement consisting of multiple carbon fiber bundles 102, wherein the carbon fiber bundles 1100 are uninterrupted in the axial direction in the yarn arrangement; each carbon fiber yarn spool 1100 is wound by winding a single carbon fiber bundle 102, and each carbon fiber bundle 102 is composed of multiple carbon fiber monofilaments; S2, widening the yarn obtained in S1 to obtain a laterally dispersed gauze; S3, immersing the gauze obtained in S2 into the liquid silicone 101 to obtain a carbon fiber silicone cloth 103 attached with the liquid silicone 101; S4, semi-curing the carbon fiber silicone cloth 103 obtained in S3 to obtain a carbon fiber silicone prepreg 104; S5, cutting the carbon fiber silicone prepreg 104 obtained in S4 into multiple prepreg unit sheets 106, such as Figure 2And the width of the prepreg unit sheet 106 is 300 mm ~ 1500mm, the thickness of the prepreg unit sheet 106 is 0.1mm ~ 0.5mm, the length of the prepreg unit sheet 106 is 300 mm ~ 1500mm; S6, stacking multiple prepreg unit sheets 106 obtained in S5, and the carbon fiber monofilaments in each prepreg unit sheet 106 are parallel to the carbon fiber monofilaments in other prepreg unit sheets 106, to obtain a carbon fiber silicone block 105 formed by stacking multiple prepreg unit sheets 106, as shown in FIG. Figure 3 ; S7, curing the carbon fiber silicone block 105 to obtain a cured carbon fiber silicone block 105; S8, cutting the cured carbon fiber silicone block 105 obtained in S7 along a direction perpendicular to the axial direction of the internal carbon fiber, as shown in FIG. Figure 4 , obtain a continuous carbon fiber silicone thermal interface material 100, such as Figure 5 .

[0033] It should be noted that Figure 2 The multiple parallel lines within the image are carbon fiber bundles 102, and the area between the lines is silicone 101. Since silicone has the advantages of excellent elasticity, a wide temperature range, low modulus, high damping capacity, light weight, easy processing, and low cost, it is very suitable for use as a thermal interface material. Therefore, the present invention first uses liquid silicone 101 to impregnate gauze, and finally completely cures the liquid silicone 101 to form the continuous carbon fiber silicone thermal interface material 100 of the present invention.

[0034] In S1, the present invention directs the ends of the carbon fiber bundles 102 in the multi-roll carbon fiber spools 1100 so that the ends of the carbon fiber bundles 102 in the multi-roll carbon fiber spools 1100 are pulled out in the same direction in an orderly manner, so that all the carbon fiber bundles 102 are presented in a regular unidirectional arrangement state. Therefore, the carbon fiber bundles 102 of the present invention are all in a regular direction. Moreover, each carbon fiber bundle 102 is composed of a large number of carbon fiber monofilaments. Taking the 12K carbon fiber bundle 102 of common industry specifications as an example, the diameter of each carbon fiber bundle 102 is relatively thick, generally 5 mm. Due to the limitations of the yarn arrangement process, there is a wide gap between the two carbon fiber bundles 102 in the yarn arrangement.

[0035] In S2, the present invention applies lateral pressure to each bundle of carbon fiber bundles 102 to widen each bundle of carbon fiber bundles 102, so that each bundle of carbon fiber bundles 102 is dispersed, for example, dispersed into 10 mm, thereby filling the gaps between the two carbon fiber bundles 102, avoiding the formation of silica gel 101 enriched areas during subsequent silica gel 101 impregnation, and improving the density and mechanical uniformity of the continuous carbon fiber silica gel thermal interface material 100. At the same time, widening makes the spacing between the carbon fiber filaments uniform, increases the contact area between the carbon fiber filaments and the silica gel 101, and is conducive to the silica gel 101 penetrating into the interior of the carbon fiber filaments, forming a tighter interface between the carbon fiber filaments and the matrix, and improving the shear strength of the continuous carbon fiber silica gel thermal interface material 100. More importantly, after widening, the carbon fiber filaments are dispersed, so that the overall thermal conductivity of the continuous carbon fiber silica gel thermal interface material 100 is uniform, thereby improving the thermal conductivity efficiency.

[0036] In the present invention, in S3 , liquid silicone 101 is used as a matrix material to penetrate into the gaps between the carbon fiber filaments to fix the positions of the carbon fiber filaments.

[0037] The present invention semi-cures the silica gel 101 in S4, so that the silica gel 101 forms a semi-solid structure with a certain viscosity and flexibility. This can not only prevent the liquid silica gel 101 from flowing, but also provide structural conditions for cutting in S5, and can form a prepreg unit sheet 106 with precise size in S5, which is convenient for subsequent lamination operations. During the semi-curing process of the silica gel 101, it is partially cross-linked and retains a certain reactivity, providing conditions for the interface fusion with the adjacent layer prepreg unit sheet 106 during the subsequent full curing, thereby enhancing the interlayer bonding force. After semi-curing, the silica gel 101 can fix the position of the carbon fiber monofilament, avoid the displacement of the carbon fiber monofilament during the lamination process, and ensure the consistency of the orientation of the carbon fiber monofilament in the final product.

[0038] In the present invention, in step S5, the carbon fiber silicone prepreg 104 is cut so that the carbon fiber filaments in each prepreg unit sheet 106 are arranged in a single direction, in the longitudinal direction. Furthermore, because the carbon fiber silicone prepreg of the present invention has undergone a semi-curing treatment and has a certain hardness, the prepreg unit sheets 106 of uniform width and thickness can be accurately cut during cutting, ensuring inter-layer alignment and uniform pressure distribution during stacking.

[0039] In the present invention, multiple prepreg unit sheets 106 in S6 are stacked in the direction perpendicular to the surface of the prepreg unit sheet 106, and the axial direction of the carbon fiber monofilaments in the obtained carbon fiber silicone block 105 is the same as the axial direction of the carbon fiber monofilaments in each prepreg unit sheet 106, so that the carbon fiber monofilaments of all prepreg sheets in the carbon fiber silicone block 105 are distributed in parallel, forming a continuous heat conduction channel running through the carbon fiber silicone block 105, and heat can be quickly transferred along the axial direction of the carbon fiber monofilaments, avoiding heat conduction faults caused by directional misalignment of the carbon fiber monofilaments.

[0040] Since carbon fiber has excellent thermal conductivity in the axial direction, its thermal conductivity along the fiber axis is greater than 900W / (m K), while the thermal conductivity along the radial direction of the fiber is only 10W / (m K). The present invention precisely controls the orientation of carbon fibers along a specific direction, creating a continuous, efficient heat conduction path. This ultimately results in a continuous carbon fiber silicone thermal interface material 100 with high thermal conductivity. This invention ensures that the axial direction of the carbon fiber filaments aligns with the primary direction of heat conduction, maximizing their high axial thermal conductivity.

[0041] The continuous carbon fiber silicone thermal interface material 100 is prepared by the method for preparing the continuous carbon fiber silicone thermal interface material 100. In the continuous carbon fiber silicone thermal interface material 100, all carbon fibers are parallel along the thickness direction of the continuous carbon fiber silicone thermal interface material 100; and the length of each carbon fiber is the same as the thickness of the continuous carbon fiber silicone thermal interface material 100. Therefore, during the heat dissipation process, the heat transfer path along the carbon fibers is the shortest, and the axial thermal conductivity of the carbon fibers is maximized. Compared with the chopped carbon fiber fillers of the prior art, these chopped carbon fibers are difficult to meet all orientations, and these chopped carbon fibers cannot be continuous and uninterrupted. Because the carbon fibers in the continuous carbon fiber silicone thermal interface material 100 of the present invention are all oriented in the same direction and are continuous, its heat dissipation performance can be greatly improved.

[0042] Example 2: A method for preparing a continuous carbon fiber silicone thermal interface material. Other features are the same as those of Example 1, such as Figures 6 to 8 , the difference is that it includes the following steps: S1, a plurality of carbon fiber spools 1100 are mounted on a creel 200, and then the ends of the carbon fiber bundles 102 in the plurality of carbon fiber spools 1100 are pulled out and arranged into yarns through a yarn arrangement device 300; S2, widening the yarn obtained in S1 through the yarn spreading device 400, so that the multiple carbon fiber monofilaments in the carbon fiber bundles 102 are spread horizontally, thereby filling the gaps between adjacent carbon fiber bundles 102, and obtaining a horizontal gauze; S3, immersing the gauze obtained in S2 into a dipping tank 500 pre-placed with liquid silicone 101 to obtain a carbon fiber silicone cloth 103 attached with liquid silicone 101; S4, semi-curing the carbon fiber silicone cloth 103 obtained in S3 through the semi-curing drying tunnel 1200 to obtain a carbon fiber silicone prepreg 104, and then pulling the carbon fiber silicone prepreg 104 through the pulling device 600, and then the carbon fiber silicone prepreg 104 enters the film unwinding device 700, so that the lower surface and the upper surface of the carbon fiber silicone prepreg 104 are covered with a protective film, and finally the carbon fiber silicone prepreg 104 is pulled to the winding device (not shown in the figure) for winding, wherein the protective film can be a PI film or a PE film, etc., which has the advantages of high temperature resistance and easy removal; S5, cutting the carbon fiber silicone prepreg sheet 104 obtained in S4 into prepreg unit sheets 106 by a cutting machine 800; S6. Remove the protective films on the upper and lower surfaces of the carbon fiber silicone block 105, and then stack multiple prepreg unit sheets 106, with the carbon fiber monofilaments in each prepreg unit sheet 106 being parallel to the carbon fiber monofilaments in other prepreg unit sheets 106, to obtain a carbon fiber silicone block 105 stacked by multiple prepreg unit sheets 106; wherein the protective film is removed before stacking, specifically, the protective films on the upper and lower surfaces of the carbon fiber silicone block 105 can be manually torn off; S7, applying pressure and heating to the carbon fiber silicone block 105 in a hot pressing curing furnace 900 to cure the carbon fiber silicone block 105, to obtain a cured carbon fiber silicone block 105; S8. Cut the cured carbon fiber silicone block 105 obtained in S7 along a direction perpendicular to the axial direction of the internal carbon fibers using a slicer 1000 to obtain a continuous carbon fiber silicone thermal interface material 100.

[0043] It should be noted that the yarn spreading device 400, glue dipping tank 500, traction device 600, film unwinding device 700, cutting machine 800, hot pressing curing furnace 900, and semi-curing drying tunnel 1200 used in this embodiment are all common devices in this field, and the specific structure of the yarn spreading device 400, glue dipping tank 500, traction device 600, film unwinding device 700, cutting machine 800, hot pressing curing furnace 900, and semi-curing drying tunnel 1200 of the present invention is not the focus of the invention, and those skilled in the art should be aware of the principles and methods of use of these devices, which will not be elaborated here.

[0044] Compared with Example 1, this embodiment makes the preparation method of the continuous carbon fiber silicone thermal interface material 100 of the present invention more specific through equipment such as the yarn unwinding device 400, the glue dipping tank 500, the traction device 600, the film unwinding device 700, the cutting machine 800, the hot pressing curing furnace 900, and the semi-curing drying tunnel 1200, and significantly improves the engineering and industrialization level of the preparation of the continuous carbon fiber silicone thermal interface material 100.

[0045] Example 3: A continuous carbon fiber silicone thermal interface material is prepared by the preparation method of the continuous carbon fiber silicone thermal interface material 100 of Example 1 or Example 2.

[0046] The present invention is based on the fact that carbon fiber has excellent thermal conductivity in the axial direction, and its thermal conductivity along the fiber axis is greater than 900W / (m K), while the thermal conductivity along the radial direction of the fiber is only 10W / (m K). The continuous carbon fiber silicone thermal interface material 100 of the present invention precisely controls the orientation of carbon fibers along a specific direction, creating a continuous, efficient thermal conductivity path. The result is a continuous carbon fiber silicone thermal interface material 100 with high thermal conductivity. This invention ensures that the axial direction of the carbon fiber filaments aligns with the primary direction of heat conduction, maximizing the advantage of high axial thermal conductivity.

[0047] The carbon fibers in this continuous carbon fiber silicone thermal interface material 100 are all parallel to the thickness of the silicone 101 sheet and are continuous. During the heat dissipation process, the heat transfer path along the carbon fibers is the shortest, and the axial thermal conductivity of the carbon fibers is maximized. Compared with existing chopped carbon fiber fillers, these chopped carbon fibers are difficult to achieve full orientation and are not continuous. Because the carbon fibers in the continuous carbon fiber silicone thermal interface material 100 of the present invention are all oriented in the same direction and are continuous, its heat dissipation performance can be significantly improved.

[0048] Test Case

[0049] The continuous carbon fiber silicone thermal interface material obtained by the present invention was used as a test sample and a control sample as a sample for thermal conductivity testing, and the dimensions of the test sample and the control sample were both 25.2mm×25.2mm×2mm. The carbon fiber content of the test sample and the control sample was 50wt%. The control sample was a thermal interface material with chopped carbon fiber filler, wherein the chopped carbon fiber material is a product made by cutting chopped carbon fiber tows, and the length of this short fiber is 3mm-6mm. The thermal conductivity was tested using a thermal conductivity coefficient tester (LW-9389), wherein the thermal conductivity of the continuous fiber silicone thermal interface material obtained by the present invention was 35W / (m·K), and the thermal conductivity of the control sample was 9W / (m·K). Therefore, the continuous carbon fiber silicone thermal interface material obtained by the present invention has high heat dissipation performance.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A method for preparing a continuous carbon fiber silicone thermal interface material, characterized in that: The steps include: S1. Pulling out the ends of the carbon fiber bundles from the multiple carbon fiber yarn spools and arranging them transversely into a yarn arrangement consisting of multiple carbon fiber bundles, wherein the carbon fiber bundles are uninterrupted in the axial direction in the yarn arrangement; each carbon fiber yarn spool is wound by winding a single carbon fiber bundle, and each carbon fiber bundle is composed of multiple carbon fiber monofilaments; S2, widening the yarn obtained in S1 to obtain a laterally dispersed gauze; S3, immersing the gauze obtained in S2 into liquid silicone to obtain a carbon fiber silicone cloth attached with liquid silicone; S4, semi-curing the carbon fiber silicone cloth obtained in S3 to obtain a carbon fiber silicone prepreg; S5, cutting the carbon fiber silicone prepreg obtained in S4 into multiple prepreg unit sheets; S6, stacking multiple prepreg unit sheets obtained in S5, with the carbon fiber monofilaments in each prepreg unit sheet being parallel to the carbon fiber monofilaments in other prepreg unit sheets, to obtain a carbon fiber silicone block formed by stacking multiple prepreg unit sheets; S7, curing the carbon fiber silicone block to obtain a cured carbon fiber silicone block; S8, cutting the cured carbon fiber silicone block obtained in S7 along a direction perpendicular to the axial direction of the internal carbon fibers to obtain the continuous carbon fiber silicone thermal interface material.

2. The method for preparing the continuous carbon fiber silicone thermal interface material according to claim 1, characterized in that: Specifically, S1 comprises installing a plurality of carbon fiber bobbins on a yarn rack, pulling out the ends of the carbon fiber bundles in the plurality of carbon fiber bobbins, and arranging the carbon fiber bundles into the yarn arrangement through a yarn arrangement device.

3. The method for preparing the continuous carbon fiber silicone thermal interface material according to claim 1, characterized in that: The S2 specifically widens the yarn obtained in S1 through a yarn spreading device, so that the multiple carbon fiber monofilaments in the carbon fiber bundle are spread horizontally, thereby filling the gaps between adjacent carbon fiber bundles to obtain a horizontal gauze.

4. The method for preparing the continuous carbon fiber silicone thermal interface material according to claim 1, characterized in that: The S3 is specifically to immerse the gauze obtained in S2 into a dipping tank pre-placed with liquid silicone to obtain the carbon fiber silicone cloth attached with liquid silicone.

5. The method for preparing the continuous carbon fiber silicone thermal interface material according to claim 1, characterized in that: The S4 specifically semi-cures the carbon fiber silicone cloth obtained in S3 to obtain a carbon fiber silicone prepreg, and then pulls the carbon fiber silicone prepreg through a traction device, and then the carbon fiber silicone prepreg enters the film unwinding device, so that the lower surface and the upper surface of the carbon fiber silicone prepreg are covered with a protective film, and finally the carbon fiber silicone prepreg is pulled into the winding device for winding.

6. The method for preparing the continuous carbon fiber silicone thermal interface material according to claim 1, characterized in that: The step S5 is specifically to cut the carbon fiber silicone prepreg sheet obtained in step S4 into prepreg unit sheets by a cutting machine.

7. The method for preparing the continuous carbon fiber silicone thermal interface material according to claim 5, characterized in that: The S6 specifically removes the protective films on the upper and lower surfaces of the prepreg unit sheet, and then stacks multiple prepreg unit sheets, and the carbon fiber monofilaments in each prepreg unit sheet are parallel to the carbon fiber monofilaments in other prepreg unit sheets, to obtain a carbon fiber silicone block formed by stacking multiple prepreg unit sheets.

8. The method for preparing the continuous carbon fiber silicone thermal interface material according to claim 1, characterized in that: The S4 specifically semi-cures the carbon fiber silicone cloth obtained in S3 through a semi-curing drying tunnel to obtain a carbon fiber silicone prepreg; The S7 specifically pressurizes, heats and solidifies the carbon fiber silica gel block in a hot pressing curing furnace; The S8 is specifically to cut the cured carbon fiber silicone block obtained in S7 along a direction perpendicular to the axial direction of the internal carbon fiber by a slicer to obtain the continuous carbon fiber silicone thermal interface material.

9. The method for preparing the continuous carbon fiber silicone thermal interface material according to any one of claims 1 to 8, characterized in that: The width of the prepreg unit sheet is 300 mm to 1500 mm; The thickness of the prepreg unit sheet is 0.1 mm to 0.5 mm; The length of the prepreg unit sheet is 300 mm to 1500 mm.

10. A continuous carbon fiber silicone thermal interface material, characterized by: The continuous carbon fiber silicone thermal interface material is prepared by the preparation method of any one of claims 1 to 9.

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