Graphene-containing silicone rubber composite material with high thermal conductivity and preparation method thereof

A composite material and graphene technology, applied in the direction of heat exchange materials, chemical instruments and methods, etc., can solve the problems of cumbersome graphite treatment process, etc., and achieve the effect of easy industrial scale production, industrial scale production, and excellent thermal conductivity

Inactive Publication Date: 2014-03-12
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
View PDF3 Cites 45 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese invention patent application (CN102827480A) discloses a method for preparing a high thermal conductivity silicone rubber composite material, by adding expanded graphite to the silicone rubber to improve the thermal conductivity of the silicone rubber, but this method is cumbersome for the graphite treatment process

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Graphene-containing silicone rubber composite material with high thermal conductivity and preparation method thereof
  • Graphene-containing silicone rubber composite material with high thermal conductivity and preparation method thereof
  • Graphene-containing silicone rubber composite material with high thermal conductivity and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0030] The high thermal conductivity silicone rubber composite material provided by the present invention and its preparation method comprise the following steps:

[0031] (1) Knead the matrix, thermally conductive filler and vulcanizing agent at room temperature (20°C-30°C) to obtain the compounded rubber;

[0032] (2) Place the obtained mixed rubber in a vacuum drying oven, and at a certain temperature, use a vacuum method to remove internal air bubbles.

[0033] (3) The mixed rubber obtained in step (2) is hot-pressed and vulcanized by a flat vulcanizer, and then subjected to two-stage vulcanization in a vacuum drying oven to obtain a high thermal conductivity silicone rubber composite material.

[0034] Wherein, the matrix is ​​silicone rubber raw rubber, and the silicone rubber raw rubber is polysiloxane containing vinyl with a molecular weight of 200,000 to 1,000,000 (such as: methyl vinyl silicone rubber, methyl silicone rubber, methyl vinyl benzene base silicone rubbe...

Embodiment 1

[0037] (1) Weigh 100g of methyl vinyl silicone rubber, put it into a two-roll mill, the processing temperature is 24°C, and then add 25g of graphene ( figure 1 ), and 0.7g of vulcanizing agent (2,5-dimethyl-2,5-di-tert-butylperoxyhexane DHBP), after mixing evenly, thin pass 5 times, and the next tablet.

[0038] Such as figure 1 Shown, the morphology characteristic and technical parameter of graphene of the present invention are as follows:

[0039] From figure 1 It can be seen from the figure that graphene has a very good sheet structure. Because it has a very large aspect ratio (greater than 1000), its diameter is 0.5-5μm, and its thickness is 1-5nm. It shows a curled shape as shown in the figure macroscopically. , appearing as fluffy clusters.

[0040] (2) Put the mixed rubber in a vacuum drying oven at a temperature of 50°C, and vacuum 5 times to remove internal air bubbles.

[0041] (3) Put the mixed rubber with air bubbles removed in a suitable mold, cover the steel ...

Embodiment 2

[0043] (1) Weigh 100g of methyl vinyl silicone rubber, put it into a two-roll mill, the processing temperature is 24°C, and then add 25g of graphene ( figure 1 ) and 44g of alumina ( figure 2 ), and 0.7g of vulcanizing agent (2,5-dimethyl-2,5-di-tert-butylperoxyhexane), after mixing evenly, thin pass 8 times, and the next tablet.

[0044] Such as figure 2 Shown, the morphology characteristics and technical parameter of aluminum oxide of the present invention are as follows: from figure 2 Visible in Al2 o 3 It is a dense spherical particle with a particle size ranging from 20 to 100 μm.

[0045] (2) Put the mixed rubber in a vacuum drying oven at a temperature of 50°C, and vacuum 5 times to remove internal air bubbles.

[0046] (3) Put the mixed rubber with air bubbles removed in a suitable mold, cover the steel plate up and down, place it in a flat vulcanizer for high-temperature vulcanization, cross-linking and hot-press molding. The conditions are 170°C, 10MPa, and th...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
particle diameteraaaaaaaaaa
Login to view more

Abstract

The invention belongs to the field of a heat conducting polymer-based composite, and particularly relates to a graphene-containing silicone rubber composite material with the high thermal conductivity and a preparation method thereof. The composite material comprises a matrix, a heat conducting filler and a vulcanizing agent. The preparation method comprises the following steps: mixing at a room temperature so as to obtain a mixed rubber material; and carrying out hot press molding and one-stage vulcanization on the mixed rubber material by using a flat vulcanizing machine, and putting in a drying oven, carrying out two-stage vulcanization, thus obtaining the silicone rubber composite material with the high thermal conductivity. As graphene is high in thermal conductivity and has a unique two-dimensional lamellar structure, an interconnected heat conducting network is easy to form in the composite material, and the thermal conductivity of the silicon rubber composite material is obviously increased; and the thermal conductivity of the graphene-containing silicone rubber composite material is 0.3W / m.K-1.5W / m.K, and the hardness of the silicone rubber composite material can be reduced. The graphene-containing silicone rubber composite material with the high thermal conductivity is simple in preparation technology, high in production efficiency and easy for the realization of industrialization mass production, and meanwhile, a direction is pointed out for the batch application of graphene.

Description

technical field [0001] The invention belongs to the field of thermally conductive polymer composite materials, and in particular relates to a high thermally conductive silicone rubber composite material containing graphene and a preparation method thereof. Background technique [0002] With the high integration and high power of modern electronic chip technology, the development of new thermal interface materials with high thermal conductivity has become a key issue that needs to be solved urgently. [0003] Silicone rubber has excellent comprehensive properties such as high temperature resistance, high voltage resistance, ozone aging resistance, and radiation resistance. It is a thermal interface matrix material widely used in industry. However, the thermal conductivity of silicone rubber is low (the thermal conductivity is only 0.15W / m·K), and it is not suitable for direct use as a thermal interface material. Usually, it is necessary to add thermal conductive fillers to im...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/07C09K5/14C08K3/04C08K3/22C08K5/14B29C35/02
Inventor 曾尤郑雅轩英哲马超群任文才刘畅成会明
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap