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Heat-conducting fin with oriented graphene fibers and preparation method thereof

A graphene fiber, orientation arrangement technology, applied in chemical instruments and methods, flat products, measuring heat, etc., can solve the thermal conductivity limitation of high thermal conductivity gaskets, improve thermal conductivity, high filling amount of inorganic powder, gasket flexibility, Poor physical properties such as toughness and elasticity

Active Publication Date: 2020-01-31
江苏鸿凌达科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, ordinary high thermal conductivity gaskets generally have a high filling amount of inorganic powder, and high filling will lead to poor physical properties such as flexibility, toughness, and elasticity of the gasket.
The thermal conductivity of traditional inorganic powders such as alumina, aluminum nitride, boron nitride, etc. are all below 300W, and the thermal conductivity sheets made of inorganic powder filling are generally below 10W. The thermal conductivity of traditional thermal conductive powders limits high Improved thermal conductivity of thermal pads

Method used

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  • Heat-conducting fin with oriented graphene fibers and preparation method thereof
  • Heat-conducting fin with oriented graphene fibers and preparation method thereof
  • Heat-conducting fin with oriented graphene fibers and preparation method thereof

Examples

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preparation example Construction

[0063] Embodiments of the present invention provide a thermally conductive sheet with graphene fiber orientation and a preparation method thereof, such as figure 1 shown, including:

[0064] Step 1: Mix the matrix resin, graphene fiber, and thermally conductive powder uniformly with a stirring device to obtain a mixture;

[0065] Step 2: Pour the mixture into the annular groove 23 of the molding device, open the molding device to rotate the annular groove 23 at its center; orient the graphene fibers in the mixture along the flow direction; simultaneously heat the mixture to obtain an annular solid 3;

[0066] Step 3: placing the annular solid 3 in an oven to heat and solidify;

[0067] Step 4: Using a slicing device to slice the heated and solidified ring-shaped solid 3 along the radial direction of the ring to obtain a heat-conducting sheet in which graphene fibers are oriented and arranged in the thickness direction.

[0068] The working principle and beneficial effects o...

Embodiment 1

[0143] 1000mpa.s viscosity vinyl silicone oil with a mass ratio of 10%, graphene fibers with an average length of 150um and an average diameter of 10um with a mass ratio of 25%, and aluminum powder with an average particle diameter of 1um with a mass ratio of 65% , other necessary additives, etc. were added to the mixer and stirred for 1.5 hours. The mixer is equipped with vacuum equipment to remove the air in the material during the mixing process. After the mixture is prepared, it is fed into the orientation annular tank. Turn on the forming unit. The rotation speed is 80r / min, and the heating is turned on after 15 minutes of rotation, and the temperature is set to 55 degrees. Control the appropriate degree of cross-linking of the material, so that the arrangement of graphene fibers in the material is fixed to obtain a ring-shaped solid. Put the ring-shaped solid in a 140 degree oven for 1 hour to solidify.

[0144] Cut the obtained annular solid into 0.5mm, 1mm, 2mm the...

Embodiment 2

[0146] Vinyl silicone oil with a mass ratio of 1000mpa.s viscosity of 10%, graphene fibers with an average length of 150um and an average diameter of 10um with a mass ratio of 25%, and an average particle diameter of 1um with a mass ratio of 15% aluminum powder , with an average particle size of 0.8um and a mass ratio of 15% of spherical alumina, with an average particle size of 2um and a mass ratio of 35% of spherical alumina, and other necessary additives, etc., were added to a mixer and stirred for 1.5 hours to obtain mixture. Subsequent operations are as in Example 1.

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Abstract

The invention provides a heat-conducting fin with oriented graphene fibers and a preparation method thereof. The preparation method comprises the following steps: 1, uniformly mixing matrix resin, graphene fibers and heat-conducting powder through a stirring device so as to obtain a mixture; 2, pouring the mixture into an annular groove of a forming device, starting the forming device to enable the annular groove to rotate around the center of the forming device, orienting graphene fibers in the mixture along a flowing direction, and heating the mixture to obtain an annular solid; 3, placing the annular solid in an oven for heating and curing; and 4, slicing the heated and cured annular solid in the radius direction of a circular ring by adopting a slicing device so as to obtain the heat-conducting fin with the graphene fibers arranged in the thickness direction in an oriented manner. The preparation method of the invention prepares the heat-conducting fin with the graphene fibers oriented in the thickness direction, and the prepared heat-conducting fin has better heat-conducting property.

Description

technical field [0001] The invention relates to the technical field of heat conduction sheets, in particular to a heat conduction sheet with graphene fiber orientation arrangement and a preparation method thereof. Background technique [0002] At present, ordinary high thermal conductivity gaskets generally have a high filling amount of inorganic powder, and high filling will lead to poor physical properties such as flexibility, toughness, and elasticity of the gasket. The thermal conductivity of traditional inorganic powders such as alumina, aluminum nitride, boron nitride, etc. are all below 300W, and the thermal conductivity sheets made of inorganic powder filling are generally below 10W. The thermal conductivity of traditional thermal conductive powders limits high The thermal conductivity of the thermal pad is improved. [0003] For fiber-type and sheet-type thermally conductive materials, the thermal conductivity is anisotropic in the axial and radial directions of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08L83/07C08K7/06C08K3/08C08K7/18C08K3/04C08K3/28G01K13/00B29D7/01C09K5/14
CPCC08J5/18G01K13/00B29D7/01C09K5/14C08J2383/07C08K7/06C08K2003/0812C08K7/18C08K3/04C08K2201/014C08K2003/282
Inventor 郭志军杨兰贺陈瑶
Owner 江苏鸿凌达科技有限公司