Longitudinal high-thermal-conductivity gasket, preparation method and application

A high thermal conductivity, vertical technology, applied in coatings, devices for coating liquid on the surface, etc., can solve problems such as the difficulty in controlling the orientation of anisotropic fillers, the inability to effectively remove air bubbles, and affecting the heat conduction effect of products. , to achieve the effect of not easy to stratify, exclude air bubbles, and high degree of continuity

Pending Publication Date: 2021-10-29
CHANGZHOU FUXI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The super-strong electric field requires multiple coating-flocking-dipping-vulcanization cycles. The process is relatively complicated, and it is difficult to control the orientation of anisotropic fillers during flocking. The solution used for dipping must be fluid, which will lead to filling The amount is greatly reduced, and some air bubbles may not be effectively eliminated during the impregnation process, these unfavorable factors ultimately affect the heat conduction effect of the product

Method used

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  • Longitudinal high-thermal-conductivity gasket, preparation method and application

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preparation example Construction

[0079] figure 1 is a schematic diagram of the preparation method of the longitudinal high thermal conductivity gasket of the present invention, as figure 1 Shown, described preparation method comprises:

[0080] Mixing materials, mixing the materials evenly to obtain a mixed material, the materials include a binder, an anisotropic thermally conductive filler and an optional isotropic thermally conductive filler;

[0081] Coating and semi-curing, applying the mixed material to the surface of the base material, obtaining a coating on the surface of the base material, and treating (heating or / and standing) the coating to a semi-cured (semi-vulcanized) state , obtain the coating of semi-cured (semi-vulcanized) state;

[0082] Repeating the coating and semi-curing treatment, coating the mixed material on the coating in the semi-cured state again, repeating the semi-curing treatment and coating several times until the thickness of the coating reaches the thickness requirement;

...

Embodiment 1

[0088] In this embodiment, binder: polydimethylcyclosiloxane, content 40wt.%,

[0089] Anisotropic thermal conductive filler: carbon fiber, content 60wt.%, length 300μm, diameter 15μm,

[0090] Coating rate: 1.5m / min,

[0091] The thickness of each coating is 1.5mm and the width is 200mm.

[0092] Heating: temperature 80°C, time 3min,

[0093] Vulcanization: temperature 150°C, time 30min,

[0094] After testing, the applied thermal resistance of the vertical high thermal conductivity gasket obtained in this embodiment is 1.42W cm 2 / K, thermal conductivity 17.75W / (m K), compression rebound rate 92%.

Embodiment 2

[0096] In this embodiment, binder: polydimethylsiloxane, content 30wt.%,

[0097] Anisotropic thermal conductive filler: carbon fiber, content 40wt.%, length 100μm, diameter 10μm,

[0098] Isotropic thermally conductive filler: alumina, content 30wt.%, particle size 100μm,

[0099] Coating rate: 0.5m / min,

[0100] The thickness of each coating is 0.5mm, and the width is 100mm.

[0101] Heating: temperature 60°C, time 5min,

[0102] Vulcanization: temperature 100°C, time 90min,

[0103] After testing, the applied thermal resistance of the vertical high thermal conductivity gasket obtained in this embodiment is 2.03W·cm 2 / K, thermal conductivity 11.34W / (m K), compression rebound rate 87%.

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Abstract

The invention provides a method for preparing a longitudinal high-thermal-conductivity gasket. The method comprises the steps that materials are evenly mixed to obtain a mixed material, and the materials comprise a binder, anisotropic thermal-conductivity filler and optional isotropic thermal-conductivity filler; the surface of a matrix material is coated with the mixed material, and a coating is obtained on the surface of the matrix material; the obtained coating is treated to be in a semi-vulcanized state, and a coating in the semi-vulcanized state is obtained; the obtained coating in the semi-vulcanized state is coated with the mixed material again; and the steps of semi-vulcanization and coating are repeated for multiple times, the coating is subjected to vulcanization forming, slicing is conducted in the direction perpendicular to coating, and the longitudinal high-thermal-conductivity gasket is obtained. The invention further provides the longitudinal high-thermal-conductivity gasket and application. Directional arrangement of the anisotropic thermal-conductivity filler in the matrix binder is realized, the preparation process is simple and easy to implement, large-scale continuous production is easy to realize, bubbles are effectively eliminated, and the thermal-conductivity property of the material is further improved.

Description

technical field [0001] The invention belongs to the technical field of heat conduction and heat dissipation, and relates to a longitudinal high heat conduction pad, a preparation method and an application. Background technique [0002] The main methods of existing vertical high thermal conductivity pads include: extrusion method, magnetic field orientation method, and electrostatic flocking method. The principle of the extrusion method is that during the process of extruding the material by the extruder, the anisotropic thermally conductive filler (such as carbon fiber) is oriented along the direction of the fluid flow; the extruded material is stacked, hot-pressed, vulcanized 1. After slicing, a vertical high thermal conductivity gasket is obtained. In this method, the material needs to pass through the slit during extrusion, and its thickness generally does not exceed 5mm. Therefore, the extruded material needs to be stacked and pressed into shape. The process steps are ...

Claims

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Application Information

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IPC IPC(8): B05D1/38
CPCB05D1/38B05D7/586B05D2504/00B05D2518/00B05D2503/00B05D2502/00B05D2518/10B05D2518/12B05D2601/20
Inventor 葛翔李峰周步存
Owner CHANGZHOU FUXI TECH CO LTD
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