A multilayer vertically oriented carbon fiber silica gel heat-conducting gasket and a preparation method thereof

Abstract

The application discloses a multilayer vertically oriented carbon fiber silica gel heat-conducting gasket and a preparation method thereof, which comprises a silica gel layer and an oriented carbon fiber layer; the silica gel layer and the oriented carbon fiber layer are arranged alternately, and the silica gel layer plays a role of bonding and providing material elasticity; the carbon fibers in the oriented carbon fiber layer are oriented through a rolling brush mode, and the carbon fibers are concentratedly distributed, which is more beneficial to improving the heat-conducting performance; and the heat-conducting gasket prepared by the application has simple preparation process, low price and is suitable for industrialized mass production.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of carbon fiber silica gel heat-conducting gaskets, in particular to a multi-layer vertically oriented carbon fiber silica gel heat-conducting gasket and a preparation method thereof. BACKGROUND

[0002] With the rapid development of the electronic information industry, especially the rapid development of 5G informationization, the power of semiconductor chip equipment has been greatly enhanced, and a large amount of heat will be generated in the operation process of highly integrated electronic components. The heat conduction performance of existing heat-conducting materials has been unable to meet the heat dissipation needs of chips, which will directly affect the service life and operation efficiency of electronic components.

[0003] Carbon fibers have excellent heat conduction performance in the axial direction, and high heat-conducting gaskets can be obtained by adjusting and controlling the orientation of carbon fibers along a specific direction. The commonly used methods for realizing the orientation of carbon fibers include magnetic field orientation and flow channel orientation. The magnetic field orientation has low efficiency and is not suitable for large-scale industrial application, and the flow channel orientation method is difficult to achieve good orientation degree. In view of the above problems, a solution is proposed below. SUMMARY

[0004] The purpose of the present application is to provide a multi-layer vertically oriented carbon fiber silica gel heat-conducting gasket and a preparation method thereof, which has the advantages of simple operation, easy industrialization and large-scale production, and improved heat conduction performance of the gasket.

[0005] The above technical purpose of the present application is realized by the following technical scheme:

[0006] A multi-layer vertically oriented carbon fiber silica gel heat-conducting gasket and a preparation method thereof, comprising a silica gel layer and an oriented carbon fiber layer, the preparation method comprising the following steps:

[0007] S1. According to the proportion, respectively take silica gel A, silica gel B and alumina powder, and stir them uniformly with a planetary mixer to obtain a silica gel mixture;

[0008] S2. The silica gel mixture is scraped onto a PTFE film to form a silica gel film with uniform thickness, and the silica gel film is the silica gel layer;

[0009] S3. The carbon fibers are uniformly scattered on the surface of the scraped silica gel film, and the carbon fibers and the silica gel film are brushed along the fixed direction with a roller brush to realize the orientation of the carbon fibers, and a carbon fiber / silica gel composite film is prepared;

[0010] S4. The carbon fiber / silica gel composite film is placed on a heating table for heating to realize the semi-curing of the silica gel, and a semi-cured carbon fiber / silica gel composite film is prepared;

[0011] S5. The semi-cured carbon fiber / silica gel composite film is demolded from the PTFE film, stacked in multiple layers, and cured into a block by using a hot press to obtain a block-shaped silica gel;

[0012] S6. The block-shaped silica gel is cut into a sheet shape in a direction perpendicular to the orientation of the carbon fibers to obtain a multi-layer vertically oriented carbon fiber silica gel heat-conducting gasket.

[0013] Preferably, the weight parts of each component in step S1 are as follows: 50 parts of silica gel A, 45-50 parts of silica gel B, and 0-50 parts of alumina.

[0014] Preferably, the silica gel A in step S1 is composed of vinyl silicone oil, platinum catalyst, and polymerization inhibitor; and the silica gel B is composed of vinyl silicone oil and hydrogen-containing silicone oil.

[0015] Preferably, the diameter of the alumina in step S1 is 2-6 microns.

[0016] Preferably, the diameter of the carbon fibers in the oriented carbon fiber layer is 7 microns, and the length is 1 mm.

[0017] Preferably, the thickness of the silica gel film in step S2 is 100-150 microns.

[0018] Preferably, the bristles of the roller brush in step S3 are made of PA material, the bristle spacing is 0.5 mm, the bristle diameter is 150 microns, the rotation speed of the roller brush is 10-50 revolutions per minute, and the moving speed of the roller brush is 1-10 m / min.

[0019] Preferably, the heating temperature of the heating table in step S4 is 100-150°C, and the semi-curing time is 3-5 minutes.

[0020] Preferably, the temperature of the hot press in step S5 is 100-150°C, and the curing time of the silica gel is 15-30 minutes.

[0021] Preferably, the thickness of the cut silica gel sheet in step S6 is 0.1-1 mm.

[0022] The present application has the following advantages:

[0023] (1) The present application rolls the carbon fibers onto the surface of the silica gel, stacks them in multiple layers, and forms a multi-layer carbon fiber structure by hot pressing, which greatly improves the effective concentration of the carbon fibers and is beneficial to the improvement of the thermal conductivity.

[0024] (2) The multi-layer vertically oriented carbon fiber silica gel heat-conducting gasket prepared by the present application has silica gel layers and carbon fiber layers arranged alternately, the silica gel layers ensure good adhesion between the layers and provide excellent resilience, and the carbon fiber layers ensure good thermal conductivity.

[0025] (3) The present application utilizes the narrow brush bristle spacing between the roller brushes to orient the carbon fibers along the direction of movement of the roller brushes.

[0026] (4) The multi-layer vertically oriented carbon fiber silica gel heat-conducting gasket prepared by the present application has the characteristics of simple preparation method, good heat-conducting effect, and suitability for industrial large-scale production. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 SEM picture of the multi-layer vertically oriented carbon fiber silica gel heat-conducting gasket of the embodiment;

[0028] Figure 2 Multi-layer vertically oriented carbon fiber silica gel heat-conducting gasket of the embodiment. DETAILED DESCRIPTION

[0029] The following description is only a preferred embodiment of the present application, and the protection scope is not limited to the embodiment only, and any technical solution falling within the concept of the present application should fall within the protection scope of the present application. Identical parts are denoted by identical reference numerals.

[0030] The multi-layer vertically oriented carbon fiber silica gel heat-conducting gasket of the embodiment comprises a silica gel layer and an oriented carbon fiber layer, and the silica gel layer comprises the following components in parts by weight: silica gel A 50 parts, silica gel B 48 parts.

[0031] The preparation method comprises the following steps:

[0032] S1. Silica gel A and silica gel B are respectively weighed according to the ratio and stirred uniformly by a planetary mixer to obtain a silica gel mixture;

[0033] S2. The silica gel mixture is scraped and coated onto a PTFE film to form a silica gel film with uniform thickness, and the film thickness is 100 µm;

[0034] S3. Carbon fibers are uniformly scattered onto the surface of the scraped and coated silica gel film, and a roller brush is used to roll the carbon fibers and the silica gel film along a fixed direction, the roller brush rotation speed is 10 revolutions / min, and the moving speed is 1 m / min;

[0035] S4. The carbon fiber / silica gel composite film in S3 is placed on a heating table for heating, the heating temperature is 110°C, and the heating time is 5.0 min;

[0036] S5. The semi-solid carbon fiber / silica gel composite film is demolded from the PTFE film, stacked in multiple layers, and hot-pressed in a hot press at 110°C for 20 min;

[0037] S6. The block-shaped silica gel is cut into a sheet shape with a thickness of 0.5 mm perpendicular to the direction of carbon fiber orientation to obtain a multi-layer vertically oriented carbon fiber silica gel heat-conducting gasket. According to the test standard of ASTM D-5470-01, the thermal conductivity is 12.5 W / (m﹒K).

[0038] A multi-layer vertically oriented carbon fiber silica gel heat-conducting gasket in this embodiment comprises a silica gel layer and an oriented carbon fiber layer, and the silica gel layer comprises the following components in parts by weight: 50 parts of silica gel A and 50 parts of silica gel B.

[0039] The preparation method comprises the following steps:

[0040] S1. Silica gel A and silica gel B are weighed according to the ratio and stirred uniformly by a planetary mixer to obtain a silica gel mixture;

[0041] S2. The silica gel mixture is scraped onto a PTFE film to form a silica gel film with uniform thickness, and the film thickness is 120 µm;

[0042] S3. Carbon fibers are uniformly scattered onto the surface of the scraped silica gel film, and a roller brush is used to brush the carbon fibers and the silica gel film along a fixed direction, the roller brush rotating at 15 revolutions / min and moving at 5 m / min;

[0043] S4. The carbon fiber / silica gel composite film in S3 is placed on a heating table for heating, the heating temperature is 120℃, and the heating time is 4.0 min;

[0044] S5. The semi-solid carbon fiber / silica gel composite film is demolded from the PTFE film, stacked in multiple layers, and hot-pressed at 120℃ for 15 min;

[0045] S6. The block-shaped silica gel is cut into a sheet with a thickness of 0.5 mm perpendicular to the direction of carbon fiber orientation to obtain a multi-layer vertically oriented carbon fiber silica gel heat-conducting gasket. According to the test standard of ASTM D-5470-01, the thermal conductivity is 13.0 W / (m﹒K).

[0046] A multi-layer vertically oriented carbon fiber silica gel heat-conducting gasket in this embodiment comprises a silica gel layer and an oriented carbon fiber layer, and the silica gel layer comprises the following components in parts by weight: 50 parts of silica gel A and 50 parts of silica gel B.

[0047] The preparation method comprises the following steps:

[0048] S1. Silica gel A and silica gel B are weighed according to the ratio and stirred uniformly by a planetary mixer to obtain a silica gel mixture;

[0049] S2. The silica gel mixture is scraped onto a PTFE film to form a silica gel film with uniform thickness, and the film thickness is 135 µm;

[0050] S3. Carbon fibers are uniformly scattered onto the surface of the scraped silica gel film, and a roller brush is used to brush the carbon fibers and the silica gel film along a fixed direction, the roller brush rotating at 20 revolutions / min and moving at 10 m / min;

[0051] S4. The carbon fiber / silica gel composite film in S3 was placed on a heating table for heating, the heating temperature was 140℃, and the heating time was 3.0 min;

[0052] S5. The semi-solid carbon fiber / silica gel composite film was demolded from the PTFE film, and was stacked in multiple layers, and was hot-pressed at 140℃ for 13 min;

[0053] S6. The block-shaped silica gel was cut into a sheet shape with a thickness of 0.5 mm in a direction perpendicular to the orientation of the carbon fiber, to obtain a multi-layer vertically oriented carbon fiber silica gel heat-conducting gasket. The heat conductivity was 12.8 W / (m﹒K) according to the test standard of ASTM D-5470-01.

[0054] The above-described specific embodiments further specifically describe the technical problems solved by the present application, the technical solutions and the beneficial effects. It should be understood that the above-described embodiments are merely specific embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for preparing a multilayer vertically oriented carbon fiber silica gel heat-conducting gasket, comprising a silica gel layer and an oriented carbon fiber layer, characterized in that, The preparation method comprises the following steps: S1. According to the proportion, respectively, silica gel A, silica gel B and alumina powder are weighed and stirred uniformly with a planetary mixer to obtain a silica gel mixture; S2. The silica gel mixture is scraped onto a PTFE film to form a silica gel film with uniform thickness, which is the silica gel layer; S3. Carbon fibers are uniformly scattered on the surface of the scraped silica gel film, and a roller brush is used to brush the carbon fibers and the silica gel film in a fixed direction to realize the orientation of the carbon fibers, thereby preparing a carbon fiber / silica gel composite film; S4. The carbon fiber / silica gel composite film is placed on a heating table for heating to realize the semi-curing of the silica gel, thereby preparing a semi-cured carbon fiber / silica gel composite film; S5. The semi-cured carbon fiber / silica gel composite film is demolded from the PTFE film, stacked in multiple layers, and hot-pressed into a block shape using a hot press to prepare a block-shaped silica gel; S6. The block-shaped silica gel is cut into a sheet shape perpendicular to the direction of the carbon fiber orientation to obtain a multi-layer vertically oriented carbon fiber silica gel heat-conducting gasket.

2. The method for preparing a multilayer vertically oriented carbon fiber silicone thermal pad according to claim 1, characterized in that, The weight parts of each component in step S1 are as follows: silica gel A: 50 parts, silica gel B: 45-50 parts, and alumina: 0-50 parts.

3. The method for preparing a multilayer vertically oriented carbon fiber silicone thermal pad according to claim 1, characterized in that, The silica gel A in step S1 is composed of vinyl silicone oil, platinum catalyst and polymerization inhibitor; and the silica gel B is composed of vinyl silicone oil and hydrogen-containing silicone oil.

4. The method for preparing a multilayer vertically oriented carbon fiber silicone thermal pad according to claim 1, characterized in that, The diameter of the alumina in step S1 is 2-6 microns.

5. The method for preparing a multilayer vertically oriented carbon fiber silicone thermal pad according to claim 1, characterized in that, The diameter of the carbon fibers in the oriented carbon fiber layer is 7 microns, and the length is 1 mm.

6. The method for preparing a multilayer vertically oriented carbon fiber silicone thermal pad according to claim 1, characterized in that, The thickness of the silica gel film in step S2 is 100-150 microns.

7. The method for preparing a multilayer vertically oriented carbon fiber silicone thermal pad according to claim 1, characterized in that, The bristles of the roller brush in step S3 are made of PA material, the bristle spacing is 0.5 mm, the bristle diameter is 150 microns, the rotation speed of the roller brush is 10-50 revolutions per minute, and the moving speed of the roller brush is 1-10 m / min.

8. The method for preparing a multilayer vertically oriented carbon fiber silicone thermal pad according to claim 1, characterized in that, The heating temperature of the heating table in step S4 is 100-150°C, and the semi-curing time is 3-5 minutes.

9. The method for preparing a multilayer vertically oriented carbon fiber silicone thermal pad according to claim 1, characterized in that, The temperature of the hot press in step S5 is 100-150°C, and the curing time of the silica gel is 15-30 minutes.

10. The method for preparing a multilayer vertically oriented carbon fiber silicone thermal pad according to claim 1, characterized in that, The thickness of the cut silica gel sheet in step S6 is 0.1-1 mm.

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