Flexible heat conduction sheet and preparation method thereof

A heat conduction sheet, flexible technology, applied in the field of flexible heat conduction sheet and its preparation, can solve the problems of small filling amount, inability to realize continuous production, small filling amount of silicone rubber, etc., and achieve the effect of increasing flexibility

Active Publication Date: 2018-10-23
ZHEJIANG SAINTYEAR ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Extruded carbon fiber sheets cannot be oriented in two dimensions, the orientation is not high, the filling amount of silicone rubber is small, and the heat conduction is poor. The heat conduction sheet made of liquid silica gel is poor in strength and brittle.
[0005] As we all know, graphite and carbon fiber have high thermal conductivity, but their thermal conductivity is directional. Graphite has a flake structure and has the highest thermal conductivity along the plane direction, but it has a large specific surface area and is difficult to fill. The gasket made by forced filling has poor strength.
Carbon fiber is fibrous, heat conduction is transmitted along the direction of the fiber, and it presents multiple directions in three-dimensional space. The carbon fiber can be oriented along the plane by extrusion, but the carbon fiber still has directionality on the plane, so the degree of orientation is not high. The overall thermal conductivity of the gasket in the vertical direction is limited to a certain extent. On the other hand, the filling amount of carbon fiber filled with silicone rubber as the base rubber is small, and the filling amount directly determines the thermal conductivity of the gasket. Therefore, the thermal conductivity of the silicone rubber system is severely limited. , and continuous production cannot be realized; in addition, methyl vinyl polysiloxane is used to fill the filler, although the filling amount can be increased, but the gasket made of methyl vinyl polysiloxane has poor strength, and continuous production cannot be realized

Method used

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  • Flexible heat conduction sheet and preparation method thereof
  • Flexible heat conduction sheet and preparation method thereof
  • Flexible heat conduction sheet and preparation method thereof

Examples

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preparation example Construction

[0048] The raw materials for the preparation of the flexible thermal conduction sheet provided by the present invention include 80-95 parts by mass of vinyl polysiloxane, preferably 90-95 parts by mass. The viscosity of the vinyl polysiloxane is 1000-300000 mPa·s, preferably 2000-20000 mPa·s, more preferably 5000-10000 mPa·s.

[0049] The raw materials for the preparation of the flexible thermal conduction sheet provided by the present invention further include 10-20 parts by mass of a toughening agent, preferably 15-20 parts by mass. The toughening agent is selected from one or more of UV curable silicone resins and modified silicone resins, UV curable epoxy resins and modified epoxy resins, UV curable polyurethanes and modified polyurethane resins Various, preferably UV epoxy modified acrylic resin.

[0050] The raw materials for the preparation of the flexible thermal conduction sheet provided by the present invention further include 1.2-1.5 parts by mass of hydrogen-conta...

Embodiment 1

[0073] The formula is: vinyl polysiloxane, vinyl molar content 0.05 mmoles / gm, viscosity 10000mpa.s: 90 parts by mass, epoxy-modified acrylic UV resin: 10 parts by mass, hydrogen-containing polysiloxane, hydrogen-containing moles Content 3.0mmole / gm: 1.6 parts by mass, carbon fiber 100 μm: 100 parts by mass, spherical alumina 5 μm: 150 parts by mass, spherical alumina 20 μm: 50 parts by mass, polyvinylsiloxane-platinum complex 0.2 parts by mass, 0.005 parts by mass of ethynylcyclohexanol, 20 nm of fumed silica: 5 parts by mass.

[0074] Preparation method: calender the above raw materials into sheets, pre-cure with UV, wind up, cut into blocks, mold and press at 120°C for 15 minutes, slice vertically at 2 mm, observe the surface and cross-section under a microscope, and the fibers are arranged in an orderly manner.

[0075] see figure 1 , figure 1 The scanning electron microscope image of the flexible thermally conductive sheet provided in Example 1.

Embodiment 2

[0081] The formula is: vinyl polysiloxane, vinyl molar content 0.06mmole / gm, viscosity 5000mpa.s: 95 parts by mass, epoxy-modified acrylic UV resin: 5 parts by mass, hydrogen-containing polysiloxane, hydrogen-containing mole Content 0.3%: 1.7 parts by mass, polyvinylsiloxane-platinum complex 0.15 parts by mass, ethynylcyclohexanol, 0.004 parts by mass, carbon fiber 100 μm: 100 parts by mass, spherical alumina 5 μm: 150 parts by mass, nitrogen Boron 15 μm: 20 parts by mass, fumed silica 20 nm: 5 parts by mass.

[0082] Preparation method: Mix the above raw materials and calender into sheets, preliminarily cured by UV, wind up, then cut into blocks, molded and cured at 120°C for 15 minutes, slice vertically at 2 mm, observe the surface and cross-section under a microscope, and the fibers are arranged in an orderly manner.

[0083] see image 3 , image 3 The scanning electron microscope image of the flexible heat conduction sheet provided for Example 2.

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Abstract

The invention provides a flexible heat conduction sheet. The flexible heat conduction sheet is prepared by the following steps of mixing the following raw materials in parts by mass, calendering, primarily curing, coiling, curing at high temperature, and slicing. The flexible heat conduction sheet is prepared from the following raw materials in parts by mass: 80 to 90 parts of vinyl polysiloxane,10 to 20 parts of toughening agent, 1.2 to 1.5 parts of hydrogen-containing polysiloxane, 0.01 to 0.2 part of platinum catalyst, 0.001 to 0.01 part of inhibitor, 100 to 200 parts of carbon fiber, 5 parts of vapor-phase white carbon black, and 170 to 200 parts of one or multiple of aluminum oxide, zinc oxide, silicon carbide, aluminum powder, boron nitride and aluminum nitride.

Description

technical field [0001] The invention belongs to the technical field of flexible heat conduction sheets, and in particular relates to a flexible heat conduction sheet and a preparation method thereof. Background technique [0002] With the miniaturization and high integration of electronic devices, the requirements for thermal interface materials are getting higher and higher. Traditional flexible thermal conduction sheets can no longer meet the heat transfer requirements. On the other hand, when the thermal conductivity of traditional thermal conduction materials is greater than 5W / m.K , the thermally conductive material basically loses its mechanical properties, and the gasket made has no rebound and poor strength. There are also high thermal conductivity coefficients obtained by adding carbon fibers and oriented, but the degree of orientation is not high, and only one-dimensional orientation is performed. On the vertical plane It cannot be oriented, and the gasket made is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/07C08L83/05C08L33/00C08L63/10C08K7/06C08K3/36C08K7/18C08K13/04C09K5/14
CPCC08L83/04C08L2205/025C08L2205/035C09K5/14C08L33/00C08L63/10C08K7/06C08K3/36C08K7/18C08K13/04
Inventor 陶藤董庆文
Owner ZHEJIANG SAINTYEAR ELECTRONICS TECH
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