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High-tear-strength heat-conducting silica gel material and preparation method thereof

A high tear strength, thermally conductive silicone technology, applied in heat exchange materials, chemical instruments and methods, etc., can solve the problems of elongation, low oil permeability, reduction of shock absorption, cushioning performance, tensile strength and thermal conductivity of thermally conductive silicone materials. Tear strength drop and other problems, to achieve the effect of improving mechanical properties, low product performance, low oil leakage rate

Pending Publication Date: 2021-10-29
杭州有容新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to achieve medium-to-high thermal conductivity of thermally conductive silicone materials, a high filling amount of thermally conductive powder is required, but a high filling amount will lead to a significant decrease in the tensile strength and tear strength of thermally conductive silicone materials, reducing its shock absorption and cushioning properties. performance, but also prone to deformation and cracking during actual use
[0006] Chinese patent CN103436018A discloses a high-toughness ultra-thin thermally conductive silicone gasket and its preparation method. MQ silicone resin is used in the preparation of raw materials, but its content is low and its viscosity is high. The invention focuses on the toughness of the thermally conductive silicone gasket. , did not study the tear performance, and the preparation method is not the same as the present invention. The present invention utilizes a high amount of MQ silicone resin compounded with liquid silicone rubber as the carrier of the thermally conductive filler, and pretreats the thermally conductive filler carrier by vacuum distillation And surface modification of thermally conductive fillers, prepared a thermally conductive silicone material with high tear strength, high elongation, and low oil permeability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] The components used in the preparation process of the high tear strength thermally conductive silicone material in this example are as follows: 90 parts of MQ silicone resin, 10 parts of compounded vinyl silicone oil, 2 parts of hydrogen-containing MQ silicone resin, and 0.15 parts of hydrogen-containing silicone oil , 9 parts of silane coupling agent, 1 part of platinum-vinylsiloxane complex catalyst, 1 part of 3-methyl-1-dodeyn-3-ol inhibitor, spherical alumina and spherical aluminum nitride thermally conductive filler 570 parts, 2 parts of silica gel reinforcing agent fumed silica, 0.5 part of red pigment.

[0054] The preparation process includes the following steps: 1) heating and drying 570 parts of spherical alumina and spherical aluminum nitride thermally conductive fillers at 120°C in a vacuum environment for 60 minutes to remove excess moisture, and then cooling to room temperature; 2) adding 9 parts of silane coupling agent Use absolute ethanol to prepare an ...

Embodiment 2

[0056] The components used in the preparation process of the high tear strength thermally conductive silicone material in this example are as follows: 92 parts of MQ silicone resin, 8 parts of compounded vinyl silicone oil, 2 parts of hydrogen-containing MQ silicone resin, and 0.12 parts of terminal hydrogen-containing silicone oil. Parts, 12 parts of silane coupling agent, 1 part of platinum-vinylsiloxane complex catalyst, 1.1 parts of 3-methyl-1-dodeyn-3-ol inhibitor, spherical alumina and spherical aluminum nitride heat conduction 730 parts of filler, 2 parts of silica gel reinforcing agent fumed silica, 0.6 part of red pigment.

[0057] The preparation process includes the following steps: 1) heating and drying 730 parts of spherical alumina and spherical aluminum nitride thermally conductive fillers at 120°C in a vacuum environment for 80 minutes to remove excess moisture, and then cooling to room temperature; 2) adding 12 parts of silane coupling agent Use absolute ethan...

Embodiment 3

[0059] The components used in the preparation process of the high tear strength thermally conductive silicone material in this example are as follows: 95 parts of MQ silicone resin, 5 parts of compounded vinyl silicone oil, 2.1 parts of hydrogen-containing MQ silicone resin, and 0.08 parts of hydrogen-containing silicone oil , 15 parts of silane coupling agent, 1 part of catalyst platinum-vinylsiloxane complex, 1.2 parts of 3-methyl-1-dodeyn-3-ol inhibitor, spherical alumina and spherical aluminum nitride thermally conductive filler 900 parts, 2 parts of silica gel reinforcing agent fumed silica, 0.7 part of red pigment.

[0060] The preparation process includes the following steps: 1) Heat and dry 900 parts of spherical alumina and spherical aluminum nitride thermally conductive fillers at 120°C in a vacuum environment for 90 minutes to remove excess water, and then cool to room temperature; 2) Mix 15 parts of silane coupling agent Use absolute ethanol to prepare an alcohol s...

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Abstract

The invention discloses a high-tear-strength heat-conducting silica gel material and a preparation method thereof, and the material is prepared from the following components in parts by weight: 85-100 parts of MQ silicon resin, 0-15 parts of silicon rubber, 400-1500 parts of heat-conducting filler, 6-30 parts of a surfactant, 1-6 parts of a cross-linking agent, 1-2 parts of a catalyst, 1-2 parts of an inhibitor, 0.5-1 part of an auxiliary agent and 0.1-5 parts of a silica gel reinforcing agent. Wherein the silicone rubber is formed by compounding liquid silicone rubber with different viscosities, and the heat-conducting filler is at least composed of one filler or more than two fillers with different particle sizes. The MQ silicon resin with certain structural characteristics and high dosage and the liquid silicone rubber are compounded to serve as a carrier of the heat-conducting filler, and the heat-conducting silica gel material with high tear strength, high elongation and low oil permeability is prepared through vacuum distillation pretreatment of the heat-conducting filler carrier and surface modification of the heat-conducting filler. The tearing strength of the prepared heat-conducting silica gel material can reach 4 KN / m or above, and the heat conductivity coefficient reaches 2-5 W / (m.K).

Description

technical field [0001] The invention relates to a heat-conducting silica gel material with high tear strength and a preparation method thereof, belonging to the field of thermal interface materials. Background technique [0002] Thermally conductive silica gel material is a kind of thermally conductive medium material synthesized by a special process based on silica gel, adding various auxiliary materials such as metal oxides, and is widely used in miniaturized and miniaturized electronic equipment. It can fill the surface of heat source and dissipate heat. The gap between the contact surfaces of the device transfers and dissipates the heat energy generated during the working process of the electronic device, thereby avoiding the accumulation of heat inside the electronic device and improving its operational reliability. In addition, the thermally conductive silicone material also has excellent insulation, elasticity, and good high and low temperature aging resistance, and c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/04C08L83/07C08L83/05C08K13/06C08K9/06C08K7/26C08K7/18C08K5/05C09K5/14B29C35/02
CPCC08L83/04C09K5/14B29C35/02C08L2205/025C08L2205/035C08K2201/014C08K13/06C08K9/06C08K7/26C08K7/18C08K5/05
Inventor 胡青松梁秋实
Owner 杭州有容新材料有限公司