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Preparation method and product of heat-conducting silica gel

A heat-conducting silica gel and silicone rubber technology, which is applied in the field of silica gel, can solve the problems of inability to take into account thermal conductivity, viscosity and structural strength, etc., and achieve the effects of ensuring flame retardancy and mechanical properties, good thermal conductivity, and improved thermal conductivity

Pending Publication Date: 2022-03-01
东莞市新懿电子材料技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] One of the purposes of the present invention is to provide a method for preparing thermally conductive silica gel to solve the problem that the currently prepared silica gel products cannot take into account thermal conductivity, viscosity, and structural strength after curing

Method used

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  • Preparation method and product of heat-conducting silica gel
  • Preparation method and product of heat-conducting silica gel
  • Preparation method and product of heat-conducting silica gel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A preparation method of heat-conducting silica gel, the specific steps are as follows:

[0031] Step 1: knead 3g of thermally conductive filler in advance, the kneading speed is 45r / min, the thermally conductive filler is composed of 1g of boron nitride and 2g of graphene, and the weight ratio of boron nitride to graphene is 1:2.

[0032] Step 2: Mix 100g of silicone rubber, 3g of thermally conductive filler obtained in Step 1, 8g of magnesium hydroxide, 1g of fumed silica, 1g of platinum catalyst, and 2g of methyloxygen-containing silicone oil (crosslinking agent) at 80°C uniform. The stirring speed of mixing is 70 rev / min, and the stirring time is 2h. Wherein, the silicone rubber can be selected from at least one of methyl silicone rubber, methyl vinyl silicone rubber, ethyl vinyl silicone rubber or methylphenyl vinyl silicone rubber. In this embodiment Among them, the silicone rubber is raw methyl silicone rubber.

[0033] Step 3: Vulcanize the material obtained i...

Embodiment 2

[0035] A preparation method of heat-conducting silica gel, the specific steps are as follows:

[0036] Step 1: Knead 6g of thermally conductive filler in advance, the kneading speed is 35r / min, the thermally conductive filler is composed of 3g of boron nitride and 3g of graphene, and the weight ratio of boron nitride to graphene is 1:1.

[0037] Step 2: Mix 100g of silicone rubber, 6g of thermally conductive filler obtained in Step 1, 15g of magnesium hydroxide, 10g of fumed silica, 5g of platinum catalyst, and 8g of methyloxysilicone oil (crosslinking agent) at 120°C uniform. The stirring speed of mixing is 40 rev / min, and the stirring time is 5h.

[0038] Step 3: Vulcanize the material obtained in Step 2 at 120° C. for 2 hours to obtain a flame-retardant and heat-conducting silica gel.

Embodiment 3

[0040] A preparation method of heat-conducting silica gel, the specific steps are as follows:

[0041] Step 1: knead 10g of thermally conductive filler in advance, the kneading speed is 60r / min, the thermally conductive filler is composed of 4g of boron nitride and 6g of graphene, and the weight ratio of boron nitride to graphene is 1:1.5.

[0042] Step 2: Mix 100g of silicone rubber, 10g of thermally conductive filler obtained in Step 1, 12g of magnesium hydroxide, 5g of fumed silica, 3g of platinum catalyst, and 5g of methyloxysilicone oil (crosslinking agent) at 100°C uniform. The stirring speed of mixing is 50 rpm, and the stirring time is 3 h.

[0043] Step 3: Vulcanize the material obtained in Step 2 at 100° C. for 0.5 h to obtain a flame-retardant and thermally conductive silica gel.

[0044] The consumption of each component of table 1 embodiment 1-3

[0045]

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Abstract

The invention relates to the field of silicone rubber, in particular to a preparation method of heat-conducting silica gel and a product, the heat-conducting silica gel is mainly composed of silicone rubber, heat-conducting filler, magnesium hydroxide, fumed silica, a catalyst and a cross-linking agent, and the heat-conducting filler comprises boron nitride and graphene according to the weight part ratio of 1: (1-2). The preparation method comprises the following steps: kneading a heat-conducting filler, and then carrying out plasma surface treatment to obtain a surface-treated heat-conducting filler; secondly, uniformly mixing silicone rubber, the heat-conducting filler obtained in the first step, magnesium hydroxide, fumed silica, a catalyst and a cross-linking agent at 80-120 DEG C, and finally vulcanizing the obtained material at 80-120 DEG C to obtain the flame-retardant heat-conducting silica gel. The silica gel product provided by the invention solves the problem that the currently prepared silica gel product cannot give consideration to heat-conducting property, viscosity and structural strength after curing, and in addition, the prepared silica gel product also has the advantages of environmental protection, low toxicity and good low-temperature resistance.

Description

technical field [0001] The invention relates to the field of silica gel, in particular to a preparation method and product of thermally conductive silica gel. Background technique [0002] At present, most electronic products and aerospace products tend to be miniaturized and thinner, and the use of thermally conductive materials for effective heat dissipation has become the key to ensuring the reliability and life of electronic products. Among them, thermally conductive silica gel has become one of the main thermally conductive materials due to its advantages of convenient curing, easy potting, and large amount of thermally conductive filling. Thermally conductive silica gel sheet is a kind of thermally conductive medium material synthesized by special process with silica gel as the base material, adding various auxiliary materials such as metal oxides. It is specially produced for the design scheme of using gaps to transfer heat. Heat transfer between heat sinks. [0003...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/04C08K9/00C08K3/38C08K3/04C08K3/22C08K3/36C08K9/04
CPCC08L83/04C08K2003/385C08K2003/2244C08L2205/025C08L2201/02C08K9/00C08K3/38C08K3/042C08K3/22C08K3/36C08K9/04
Inventor 赵文川黄伟乐刘鑫黄葵军
Owner 东莞市新懿电子材料技术有限公司