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Modified graphene/polyimide heat-conducting composite material and preparation method thereof

A heat-conducting composite material, polyimide technology, applied in filament/wire forming, heating/cooling fabrics, non-woven fabrics, etc., can solve problems such as deterioration of mechanical properties of PI composite materials, achieve high thermal conductivity, reduce interface Effects of improving thermal barrier and thermal conductivity

Active Publication Date: 2017-05-31
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the filled PI thermally conductive composite materials prepared by traditional methods are mostly prepared by blending thermally conductive fillers with PI resin matrix. To obtain high lambda, a large amount of thermally conductive filler needs to be filled to form a large number of thermally conductive paths or thermally conductive in the PI resin matrix. network to improve thermal conductivity; even if a high λ value is obtained, the mechanical properties of PI composites are likely to deteriorate sharply

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0019] The present invention also provides a method for preparing the above-mentioned modified graphene / polyimide thermally conductive composite material, comprising the following steps:

[0020] (a) Under ice-bath conditions, mix 1-5 parts by weight of flake graphite, 50-450 parts by weight of concentrated sulfuric acid (98% by mass fraction) and 1-5 parts by weight of sodium nitrate, and add 3-20 parts by weight part of potassium permanganate, stirred for 30-60 minutes; heated to 35°C and continued to stir for 2-3 hours, then added 200-1000 parts by weight of deionized water, heated to 85°C and stirred for 15-20 minutes, then added 15-80 parts by weight hydrogen peroxide, the solution turns golden yellow; GO is prepared by washing with 400-2000 parts by weight of deionized water, 30-150 parts by weight of dilute hydrochloric acid, suction filtration and drying.

[0021] (b) Add 1 to 5 parts by weight of GO from step (a) into a three-necked flask containing 500 to 2,500 parts...

Embodiment 1

[0026] Embodiment 1: under ice bath condition, the vitriol oil (mass fraction 98%) of 2 weight parts flake graphite, 100 weight parts and the sodium nitrate of 2 weight parts are mixed homogeneously, then add the potassium permanganate of 6 weight parts , stirred for 30 minutes; heated up to 35°C and continued to stir for 2h, then added 400 parts by weight of deionized water, raised the temperature to 85°C and stirred for 15 minutes, then added 30 parts by weight of hydrogen peroxide, the solution turned golden yellow; after 800 parts by weight of deionized Water and 60 parts by weight of dilute hydrochloric acid were suction filtered, washed and dried to prepare GO. Add 1.5 parts of GO into a flask containing 700 parts of THF, sonicate for 2 h, then add 5 parts of N,N-diisopropylcarbodiimide and 3 parts of NH 2 -POSS, react at 65°C for 48h. Finally, 2 parts of 80% hydrazine hydrate were added and reacted for 8 hours. Centrifuge, wash, and dry to obtain the final product CMG...

Embodiment 2

[0029] Embodiment 2: under ice-bath condition, the vitriol oil (massfraction 98%) and the sodium nitrate of 5 weight parts of flake graphite, 400 weight parts of 400 weight parts are mixed homogeneously, then add the potassium permanganate of 20 weight parts , stirred for 30 minutes; heated up to 35°C and continued to stir for 2h, then added 1000 parts by weight of deionized water, raised the temperature to 85°C and stirred for 15 minutes, then added 80 parts by weight of hydrogen peroxide, the solution turned golden yellow; after 2000 parts by weight of deionized GO was prepared by suction filtration, washing and drying with water and 150 parts by weight of dilute hydrochloric acid. Add 5 parts by weight of GO into a flask containing 2000 parts by weight of THF, sonicate for 2 h, then add 15 parts by weight of N,N-diisopropylcarbodiimide and 10 parts by weight of NH 2 -POSS, react at 65°C for 48h. Finally, 5 parts by weight of 80% hydrazine hydrate was added and reacted for ...

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PUM

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Abstract

The invention provides a modified graphene / polyimide heat-conducting composite material and a preparation method thereof. The preparation method comprises the following steps: by taking 1,3-bis(4-aminophenoxy)benzene and 4,4'-oxydiphthalic dianhydride as raw materials and taking modified graphene prepared from monoamino-polyhedral oligomeric silsesquioxane surface functionalization modified graphene oxide as a heat-conducting filler, preparing a CMG (chemically modified graphene) / polyamic acid heat-conducting composite fiber felt through an in-situ polymerization and electrostatic spinning method, preparing a CMG / polyimide heat-conducting composite material through a hot imidization and die pressing forming process, and realizing high heat conductivity of a PI (polyimide) resin matrix at a low filling amount of the CMG heat-conducting filler.

Description

technical field [0001] The invention relates to a polymer-based heat-conducting composite material. Background technique [0002] Polyimide (PI) is a polymer material with excellent comprehensive performance. It has many advantages such as excellent high and low temperature resistance, good chemical corrosion resistance, outstanding electrical insulation and high dimensional stability, and has been widely used It is used in the fields of aviation, spaceflight and microelectronics. However, the thermal conductivity of the PI body is poor (the thermal conductivity λ is 0.20W / mK). , Improving the thermal conductivity of the PI resin matrix is ​​the key. [0003] There are relatively few studies on PI thermally conductive composite materials at home and abroad, and most of them use thermally conductive fillers to improve the thermal conductivity of the PI resin matrix. However, the filled PI thermally conductive composite materials prepared by traditional methods are mostly p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G73/10C08K9/02C08K9/04C08K3/04D04H1/728D01D5/00D06C7/00
CPCC08G73/1028C08G73/1071C08K3/04C08K9/02C08K9/04D01D5/0015D04H1/728D06C7/00
Inventor 顾军渭郭永强梁超博杨旭彤吕昭媛张秋禹
Owner NORTHWESTERN POLYTECHNICAL UNIV
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