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A thermally conductive sheet with staggered orientation carbon nanotubes and its preparation method

A carbon nanotube and staggered arrangement technology is applied to the thermal conductive sheet with oriented staggered arrangement of carbon nanotubes and the field of preparation thereof, which can solve the problem of limited proportion of carbon nanotubes, large viscosity resistance of a block matrix, growth method and production of carbon nanotubes The problem of high cost, to achieve the effect of good compatibility, improved thermal conductivity, and high plasticity

Active Publication Date: 2022-04-22
深圳沃尔提莫电子材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In some cases, stretching and electrostatic forces are applied on both sides of the blended block, so that the disorderly distributed carbon nanotubes can be aligned under the action of a force field or an electric field. However, due to the excessive viscosity resistance of the block matrix, this The proportion of aligned carbon nanotubes obtained by similar methods is actually very limited
There are also some technologies that allow carbon nanotubes to grow oriented first, and then mix them with the matrix raw materials under oriented conditions, but this method has higher requirements on the growth method and production cost of carbon nanotubes

Method used

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  • A thermally conductive sheet with staggered orientation carbon nanotubes and its preparation method
  • A thermally conductive sheet with staggered orientation carbon nanotubes and its preparation method
  • A thermally conductive sheet with staggered orientation carbon nanotubes and its preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Premix A

[0050] 30 parts of carbon nanotubes, 100 mesh, aspect ratio 150:1;

[0051] 20 parts of methyl silicone oil, octamethylcyclotetrasiloxane;

[0052] Premix B

[0053] 15 parts of graphene, 20μm;

[0054] 40 parts of composite thermally conductive filler, a mixture of alumina and boron nitride with a mass ratio of 1:1, 200nm particles;

[0055] 20 parts of polyurethane modified silicone resin, Shin-Etsu KR-213;

[0056] 5 parts of silicone oil, octamethylcyclotetrasiloxane (that is, the same as the previous methyl silicone oil);

[0057] 3 parts of epoxy silane crosslinking agent, XR-560;

[0058] 5 parts of epoxy reactive diluent, HELOXY Modifier 7;

[0059] 1 part of defoamer, polydimethylsiloxane;

[0060] Other additives 0 parts.

[0061] The volume ratio of premix A and premix B is 1:1.

Embodiment 2

[0063] Premix A

[0064] 40 parts of carbon nanotubes, 200 mesh, aspect ratio 200:1;

[0065] 30 parts of methyl silicone oil, hexamethylcyclotrisiloxane;

[0066] Premix B

[0067] 15 parts of graphene, 20μm;

[0068] 20 parts of composite thermally conductive filler, a mixture of alumina, magnesium oxide, and zinc oxide with a mass ratio of 1:1:1, 600nm particles;

[0069] 15 parts of polyurethane modified silicone resin, Shin-Etsu KR-213;

[0070] 7 parts of silicone oil, octamethylcyclotetrasiloxane;

[0071] 5 parts of epoxy silane crosslinking agent, D-20;

[0072] 6 parts of epoxy reactive diluent, HELOXY Modifier 7;

[0073] 0.5 part of defoamer, ethylene glycol siloxane, etc.;

[0074] Other additives 0 parts.

[0075] The volume ratio of premix A and premix B is 1:1.2.

Embodiment 3

[0077] Premix A

[0078] 25 parts of carbon nanotubes, 100 mesh, aspect ratio 300:1;

[0079] 25 parts of methyl silicone oil, hexamethylcyclotrisiloxane;

[0080] Premix B

[0081] 25 parts of graphene, 80 μm;

[0082] Composite thermal conductive filler 35 parts, alumina 1000nm particles;

[0083] 20 parts of polyurethane modified silicone resin, Shin-Etsu KR-510;

[0084] 5 parts of silicone oil, octamethylcyclotetrasiloxane;

[0085] 3 parts of epoxy silane crosslinking agent, D-20;

[0086] 10 parts of epoxy reactive diluent, 501;

[0087] 2 parts of defoamer, polydimethylsiloxane;

[0088] 4 parts of other additives, 1010 of antioxidant.

[0089] The volume ratio of premix A and premix B is 1:0.8.

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Abstract

The invention provides a thermally conductive sheet with staggered orientation carbon nanotubes and a preparation method thereof. The carbon nanotubes are blended with methyl silicone oil with a viscosity below 100 cps to obtain a premix A; graphene, composite thermally conductive filler , polyurethane modified silicone resin, silicone oil, epoxy silane crosslinking agent, epoxy reactive diluent, and other additives are blended to obtain a premix B with a viscosity of 900-6000cps; make the premix A pass through an electric field, Then, after passing through the first screen, it is mixed with the premixed material B imported from both sides, and after advancing for a certain distance, it is sent out from the forming port and extruded into a block product, and the forming port is provided with a second screen; After the sample is cut into pre-pressed sheets along the direction perpendicular to the extension of the carbon nanotubes, the pre-pressed sheets are molded along the direction perpendicular to the extension of the carbon nanotubes, and the molded products are solidified and sintered to obtain the final product. The heat conduction sheet created by the invention has good orientation heat conduction effect.

Description

technical field [0001] The invention relates to the technical field of heat-conducting materials, in particular to a heat-conducting sheet with staggered orientation carbon nanotubes and a preparation method thereof. Background technique [0002] Thermally conductive silicone sheet is a commonly used thermally conductive product in electronic products. Because it can be cut into any shape according to needs, it is the first choice for thermally conductive products on the surface of irregular components. Most thermally conductive silica gel sheets are made of organic silica gel as the base material, adding thermally conductive fillers and supplemented with various additives to obtain mixed raw materials, which are formed and sintered. Thermally conductive fillers are mainly inorganic thermally conductive fillers such as alumina, magnesium oxide, zinc oxide, aluminum nitride, boron nitride, and silicon carbide, and the heat conduction method is mainly contact heat transfer. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L83/04C08L83/10C08K13/04C08K3/04C08K3/22C08K3/38C08K7/24C09K5/14
CPCC09K5/14C08L83/04C08L83/10C08L2205/025C08L2205/035C08K2201/011C08K2201/003C08K2201/004C08K2003/385C08K2003/2296C08K2003/2227C08K2003/222C08K13/04C08K3/04C08K3/22C08K3/38C08K7/24
Inventor 何千舟李雲张耀湘
Owner 深圳沃尔提莫电子材料有限公司