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CN-121973466-A - Oriented carbon fiber composite material and preparation method and application thereof

CN121973466ACN 121973466 ACN121973466 ACN 121973466ACN-121973466-A

Abstract

The invention relates to an oriented carbon fiber composite material, a preparation method and application thereof, wherein the preparation method comprises the following steps of calendaring and orienting silicon rubber containing carbon fibers to form a calendared film, carrying out primary curing, assembling with an oriented lamination, carrying out secondary curing, and cutting along a direction perpendicular to the orientation to obtain the oriented carbon fiber composite material; the thickness of the rolled film is less than or equal to 600 mu m. The oriented carbon fiber composite material provided by the invention has the advantages of high degree of orientation of carbon fibers and good heat conduction performance.

Inventors

  • HE JIANCHANG
  • ZANG JIADONG
  • LIAO ZHISHENG

Assignees

  • 东莞市兆科电子材料科技有限公司

Dates

Publication Date
20260505
Application Date
20260212

Claims (10)

  1. 1. The preparation method of the oriented carbon fiber composite material is characterized by comprising the following steps of calendaring and orienting silicon rubber containing carbon fibers to form a calendared film, carrying out primary curing, assembling with an oriented lamination, carrying out secondary curing, and cutting along a direction perpendicular to the orientation to obtain the oriented carbon fiber composite material; the thickness of the rolled film is less than or equal to 600 mu m.
  2. 2. The preparation method of the carbon fiber-containing silicone rubber mixture according to claim 1 is characterized by comprising, by weight, 100 parts of vinyl silicone oil, 1-10 parts of hydrogen-containing silicone oil, 0.6-6 parts of an auxiliary agent, 200-1000 parts of a heat conducting filler, 100-300 parts of carbon fiber and 0.2-2 parts of a catalyst; Preferably, the hydrogen content of the hydrogen-containing silicone oil is 0.1% -1.0%; Preferably, the thermally conductive filler comprises any one or a combination of at least two of aluminum oxide, aluminum nitride, boron nitride, gold, silver, copper, aluminum, diamond, graphite, or graphene; Preferably, the average particle diameter of the heat conductive filler is 0.5 to 5 μm, more preferably 1 to 3 μm.
  3. 3. The method of preparation according to claim 2, wherein the auxiliary agent comprises an inhibitor and a coupling agent; Preferably, the catalyst comprises a platinum catalyst.
  4. 4. The preparation method according to claim 3, wherein the inhibitor is 0.1-1 parts by weight; preferably, the inhibitor comprises ethynyl cyclohexanol; Preferably, the weight part of the coupling agent is 0.5-5 parts; preferably, the coupling agent comprises vinyltrimethoxysilane.
  5. 5. The method according to any one of claims 1to 4, wherein the carbon fiber has an average diameter of 5 to 10 μm; preferably, the average length of the carbon fibers is 100 to 300 μm, more preferably 150 to 250 μm.
  6. 6. The preparation method of the carbon fiber-containing silicone rubber mixture according to any one of claims 2 to 5, wherein the carbon fiber-containing silicone rubber mixture is prepared by performing first mixing on vinyl silicone oil, hydrogen-containing silicone oil and an auxiliary agent, adding a heat-conducting filler and carbon fibers for second mixing, and adding a catalyst for third mixing to obtain the carbon fiber-containing silicone rubber mixture; preferably, the first, second and third mixing are each independently performed under vacuum; Preferably, the viscosity of the carbon fiber-containing silicone rubber compound is 10000-120000 mPas at 25 ℃, more preferably 30000-90000 mPas.
  7. 7. The method according to any one of claims 1 to 6, wherein the rolling orientation comprises gradient rolling; Preferably, the calendaring orientation comprises placing a silicone rubber compound containing carbon fibers between release films for calendaring to form a calendared film; preferably, the co-oriented laminate further comprises a step of removing the release film prior to assembly; preferably, the removing the release film includes peeling the release film after the freezing treatment.
  8. 8. The method according to any one of claims 1 to 7, wherein the temperature of the primary curing is 90 to 120 ℃ for 2 to 4 hours; Preferably, the secondary curing is pressure curing, the pressure of the pressure curing is 0.5-5 MPa, the temperature is 110-130 ℃, and the time is 2-3 hours.
  9. 9. An oriented carbon fiber composite material, characterized in that the oriented carbon fiber composite material is prepared by the preparation method according to any one of claims 1 to 8.
  10. 10. Use of the oriented carbon fiber composite of claim 9 as a thermal interface material.

Description

Oriented carbon fiber composite material and preparation method and application thereof Technical Field The invention relates to the technical field of composite materials, in particular to an oriented carbon fiber composite material, a preparation method and application thereof. Background As electronic components move toward miniaturization, integration, and high power density, efficient heat dissipation has become a critical challenge in ensuring device reliability. Thermal Interface Materials (TIMs) play a key role in heat dissipation systems, with carbon fibers being widely studied for their excellent axial thermal conductivity. The traditional carbon fiber heat conduction gasket adopts a flow field orientation technology, namely, the fiber orientation is realized by using the big-diameter rubber cylinder and the small-diameter needle to switch the big-diameter fluid basin in a dispensing mode. However, the method has obvious limitations that firstly, the method requires that the mixture has certain fluidity to realize orientation, secondly, the viscosity of the mixture system is increased with the increase of the filler amount, the orientation becomes more difficult, and finally, the orientation degree of the flow field orientation is limited, so that the best heat conduction performance of the carbon fiber can not be achieved. In the prior art, although the fiber orientation can be realized to a certain extent by adopting a magnetic field orientation and electrostatic flocking method, the problems of high equipment requirement, complex process or difficult treatment of a high-viscosity system exist. Therefore, there is an urgent need to develop a preparation method of a carbon fiber composite material that can accommodate a high viscosity system, achieve a high degree of orientation of carbon fibers, and have a relatively simple process. Disclosure of Invention In order to solve the technical problems, the invention provides an oriented carbon fiber composite material, a preparation method and application thereof, wherein the oriented carbon fiber composite material has high orientation degree of carbon fibers and good heat conduction performance. To achieve the purpose, the invention adopts the following technical scheme: In a first aspect, the invention provides a preparation method of an oriented carbon fiber composite material, which comprises the steps of calendaring and orienting a silicon rubber mixture containing carbon fibers to form a calendared film, carrying out primary curing, assembling with an oriented lamination, carrying out secondary curing, and cutting along a direction perpendicular to the orientation to obtain the oriented carbon fiber composite material, wherein the thickness of the calendared film is less than or equal to 600 mu m (for example, 100 mu m, 200 mu m, 300 mu m, 400 mu m or 500 mu m, etc.), and more preferably 400-600 mu m. According to the preparation method of the oriented carbon fiber composite material, the high-efficiency oriented arrangement of the carbon fibers can be realized through the shearing force field generated by calendaring, the orientation degree is remarkably higher than that of the traditional flow field orientation method, the formation of a more efficient heat conduction path is facilitated, and the axial high heat conduction characteristic of the carbon fibers is fully exerted. The combination of calendaring orientation and co-orientation lamination assembly adopted by the invention can be suitable for a high-viscosity carbon fiber-containing silicon rubber mixing system (for example, the viscosity is 100000~120000 mPa & s at 25 ℃), breaks through the dependence of the traditional flow field orientation on high fluidity of raw materials, and provides possibility for preparing the oriented carbon fiber composite material with high filler proportion, thereby being beneficial to further improving the heat conduction property. The preparation method of the oriented carbon fiber composite material has the characteristic of strong structural controllability, and the thickness and the structure of a final product can be accurately controlled by adjusting the thickness of a rolled film, the assembly quantity of a lamination, the cutting width and the like so as to meet the requirements of different application scenes. The anisotropy of the heat conduction performance of the oriented carbon fiber composite material is remarkable, and the heat conductivity in the thickness direction can be greatly improved. The preparation method of the oriented carbon fiber composite material has good process adaptability, the required calendaring equipment is common, the preparation process is simple, and the industrial production and popularization are easier. In the invention, the thickness of the rolled film is preferably 400-600 mu m, and the orientation degree of the carbon fiber can be more than or equal to 70%, even more than or equal to 80%. If the thickness o