Search

CN-121991515-A - Non-insulating carbon fiber heat conduction gasket and preparation method thereof

CN121991515ACN 121991515 ACN121991515 ACN 121991515ACN-121991515-A

Abstract

The application provides a non-insulating carbon fiber heat conduction gasket and a preparation method thereof, and belongs to the technical field of thermal interface materials. The heat-conducting gasket is prepared from a composite material through mould pressing and solidification, wherein the composite material comprises modified carbon fiber, an organic silicon rubber matrix, a functional heat-conducting filler and a foaming agent, and the modified carbon fiber is carbon fiber of which the surface is grafted with a boron nitride nano sheet and a carbon nano tube hybridization layer. According to the application, the non-insulating carbon fiber heat conduction gasket which has high heat conduction coefficient, low interface thermal resistance, excellent compression retraction elasticity and proper hardness is successfully prepared by constructing the hybridized heat conduction layer through pre-bridging treatment on the carbon fiber, optimizing mixing and calendaring processes, adopting stepped heating, pressurizing and solidifying and introducing the thermal expansion microsphere, so that the high-efficiency heat conduction requirement is met, and meanwhile, the reliability and durability in the actual assembly and use process are ensured.

Inventors

  • ZHOU PEIXIAN
  • LAI JINHONG
  • HUANG XIANGYUAN

Assignees

  • 湖南创瑾科技有限公司

Dates

Publication Date
20260508
Application Date
20260320

Claims (10)

  1. 1. The non-insulating carbon fiber heat-conducting gasket is characterized in that the heat-conducting gasket is prepared by compression molding and curing of a composite material, and the composite material comprises modified carbon fibers, an organic silicon rubber matrix, a functional heat-conducting filler and a foaming agent; the modified carbon fiber is a carbon fiber with a boron nitride nano sheet and a carbon nano tube hybridization layer grafted on the surface of the carbon fiber.
  2. 2. The non-insulating carbon fiber thermal conductive gasket of claim 1, wherein the boron nitride nanosheets and the carbon nanotubes are cooperatively grafted to the carbon fiber surface through a silane coupling agent.
  3. 3. The non-insulating carbon fiber thermal pad of claim 1, wherein the thermal pad comprises the following components in parts by weight: 40-55 parts of modified carbon fiber, 30-45 parts of organic silicon rubber matrix, 10-20 parts of functional heat conducting filler, 3-8 parts of foaming agent and 0.5-1.5 parts of catalyst.
  4. 4. The non-insulating carbon fiber heat-conducting gasket according to claim 3, wherein the functional heat-conducting filler is a compound of spherical aluminum oxide and flaky aluminum nitride, and the mass ratio of the functional heat-conducting filler to the flaky aluminum nitride is 1.5-3:1.
  5. 5. The non-insulating carbon fiber thermal pad of claim 1, wherein the blowing agent is a thermally expandable microsphere having an initial foaming temperature of 90-110 ℃.
  6. 6. The non-insulating carbon fiber thermal conductive gasket of claim 5 wherein said gasket has a closed cell elastomeric microsphere structure formed by thermal expansion of said blowing agent.
  7. 7. A method for preparing a non-insulating carbon fiber heat conducting gasket, which is used for preparing the non-insulating carbon fiber heat conducting gasket according to any one of claims 1 to 6, and comprises the following steps: s1, carrying out modification treatment on carbon fibers to prepare modified carbon fibers with surface grafted with boron nitride nanosheets and carbon nanotube hybridization layers; S2, carrying out banburying and mixing on the modified carbon fiber, the organic silicon rubber matrix, the functional heat conducting filler and part of the catalyst to obtain a premixed sizing material; S3, carrying out hot rolling treatment on the premixed rubber material, then adding a foaming agent and the rest catalyst, and continuously rolling to obtain a rubber sheet; and S4, carrying out mould pressing solidification on the film to obtain the heat conduction gasket.
  8. 8. The method for preparing a non-insulating carbon fiber thermal pad according to claim 7, wherein the modification treatment in step S1 specifically comprises: S1a, oxidizing the carbon fiber to introduce polar functional groups; S1b, immersing the oxidized carbon fiber into a dispersion liquid containing boron nitride nano-sheets, carbon nano-tubes and a silane coupling agent for reaction, and then carrying out vacuum filtration, drying and heat treatment to firmly graft the boron nitride nano-sheets and the carbon nano-tubes on the surface of the fiber.
  9. 9. The method for preparing non-insulating carbon fiber heat-conducting gaskets according to claim 7, wherein the hot-calendering treatment in the step S3 is performed on the sizing material by repeatedly thinning the sizing material for 5-8 times on a two-roll mill at a roll temperature of 80-100 ℃.
  10. 10. The method for preparing the non-insulating carbon fiber heat-conducting gasket according to claim 7, wherein the compression molding curing in the step S4 is a step-type heating and pressurizing curing, and specifically comprises: the first stage, heating to 90-110 ℃ under 1-2 MPa pressure and maintaining the pressure for 15-25 minutes; And in the second stage, the pressure is increased to 3-6 MPa, and the temperature is increased to 125-135 ℃ and the pressure is maintained for 25-35 minutes.

Description

Non-insulating carbon fiber heat conduction gasket and preparation method thereof Technical Field The application relates to the technical field of thermal interface materials, in particular to a non-insulating carbon fiber heat conduction gasket and a preparation method thereof. Background Thermal interface materials are critical materials for heat dissipation from the chip. Which is located between the die and the vapor chamber, and between the vapor chamber and the heat sink. The method is mainly used for filling micro-voids and rugged holes on the surface generated when two hard materials are combined, reducing contact thermal resistance and improving the heat dissipation capacity of the device. At present, the thermal boundary materials are mainly divided into heat conduction silicone grease, heat conduction gel, heat conduction gaskets and heat conduction phase change materials. Among them, the heat conductive gasket has advantages of high workability and reusability. The carbon fiber heat conduction gasket has the advantages of light weight, high heat conduction, compressibility and the like, and has wide application prospect in the field of electronic heat dissipation. However, the existing non-insulating carbon fiber heat conduction gasket has the common problems that the heat conduction coefficient is low, the heat dissipation requirement of a high-power device is difficult to meet, and the compatibility of carbon fibers and a polymer matrix is poor, so that the gasket is insufficient in softness and rebound resilience and easy to crack. Disclosure of Invention The present application has been made in view of the above-described problems, and an object thereof is to provide a non-insulating carbon fiber heat conductive gasket and a method for manufacturing the same. Specifically, the first aspect of the application provides a non-insulating carbon fiber heat-conducting gasket, which is prepared by compression molding and curing of a composite material, wherein the composite material comprises modified carbon fibers, an organic silicon rubber matrix, a functional heat-conducting filler and a foaming agent; the modified carbon fiber is a carbon fiber with a boron nitride nano sheet and a carbon nano tube hybridization layer grafted on the surface of the carbon fiber. Further, the boron nitride nano-sheets and the carbon nano-tubes are cooperatively grafted on the surfaces of the carbon fibers through a silane coupling agent. Further, the heat conduction gasket comprises the following components in parts by weight: 40-55 parts of modified carbon fiber, 30-45 parts of organic silicon rubber matrix, 10-20 parts of functional heat conducting filler, 3-8 parts of foaming agent and 0.5-1.5 parts of catalyst. Further, the functional heat-conducting filler is a compound of spherical alumina and flaky aluminum nitride, and the mass ratio of the spherical alumina to the flaky aluminum nitride is 1.5-3:1. Further, the foaming agent is a thermal expansion microsphere, and the initial foaming temperature is 90-110 ℃. Further, the gasket has a closed cell elastic microsphere structure formed by thermal expansion of the foaming agent. The application provides a preparation method of a non-insulating carbon fiber heat conduction gasket, which comprises the following steps: s1, carrying out modification treatment on carbon fibers to prepare modified carbon fibers with surface grafted with boron nitride nanosheets and carbon nanotube hybridization layers; S2, carrying out banburying and mixing on the modified carbon fiber, the organic silicon rubber matrix, the functional heat conducting filler and part of the catalyst to obtain a premixed sizing material; S3, carrying out hot rolling treatment on the premixed rubber material, then adding a foaming agent and the rest catalyst, and continuously rolling to obtain a rubber sheet; and S4, carrying out mould pressing solidification on the film to obtain the heat conduction gasket. Further, the modification treatment in step S1 specifically includes: S1a, oxidizing the carbon fiber to introduce polar functional groups; S1b, immersing the oxidized carbon fiber into a dispersion liquid containing boron nitride nano-sheets, carbon nano-tubes and a silane coupling agent for reaction, and then carrying out vacuum filtration, drying and heat treatment to firmly graft the boron nitride nano-sheets and the carbon nano-tubes on the surface of the fiber. Further, the hot calendering treatment in the step S3 is to apply strong shearing to the sizing material by repeated thin pass on a two-roll open mill at the roll temperature of 80-100 ℃, wherein the number of the repeated thin pass is 5-8. Further, the die pressing and curing in the step S4 is a step-type heating and pressurizing curing, which specifically includes: the first stage, heating to 90-110 ℃ under 1-2 MPa pressure and maintaining the pressure for 15-25 minutes; And in the second stage, the pressure is increased to 3-6 MP