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Preparation method of graphene/nano silver epoxy conductive adhesive

A graphene, silver epoxy technology, applied in epoxy resin glue, conductive adhesive, adhesive and other directions, can solve the problems of unstable contact resistance, low conductivity, limited development and application, etc., to avoid agglomeration, improve Effects of Conductivity and Bond Strength

Active Publication Date: 2011-08-17
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current conductive adhesive also has the following disadvantages: the conductivity is still lower than that of tin-lead solder paste; the contact resistance is unstable under high temperature and high humidity conditions; and the bonding strength needs to be improved compared with tin-lead solder, thus limiting its development and application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] (1) Preparation of graphene:

[0045] Accurately weigh 0.2g of flake graphite powder, add it into a three-necked flask filled with organic solvent acetonitrile and 2E4MZ-CN, after mixing, put it into an ultrasonic instrument at 30°C for 6h, let it stand for 12h, take out the upper suspension solution, add Acetonitrile was diluted again, and the diluted solution was centrifuged at 4000r / min for 20 minutes to obtain a uniformly dispersed black transparent graphene suspension. The graphene suspension was distilled under reduced pressure to remove most of the acetonitrile solvent to obtain a graphene solution.

[0046] (2) Preparation of conductive adhesive:

[0047] Configure the conductive glue by the stated parts by weight:

[0048] Epoxy resin EP862 100 parts

[0049] 2E4MZ-CN 60 copies

[0050] Silver acetate 30 parts

[0051] Silver flakes (10μm) 800 parts

[0052] graphite 2 parts

[0053] Dissolve epoxy resin EP862 and silver acetate in acetonitrile solvent, s...

Embodiment 2

[0056] (1) Preparation of graphene:

[0057] Accurately weigh 0.5g of flake graphite powder, add it into a three-necked flask filled with organic solvent acetonitrile and 2E4MZ-CN, after mixing, put it into an ultrasonic instrument at 50°C for 3 hours, let it stand for 12 hours, take out the upper suspension solution, add Acetonitrile was diluted again, and the diluted solution was centrifuged at 4000r / min for 20 minutes to obtain a uniformly dispersed black transparent graphene suspension. The graphene suspension was distilled under reduced pressure to remove most of the acetonitrile solvent to obtain a graphene solution.

[0058] (2) Preparation of conductive adhesive:

[0059] Configure the conductive glue by the stated parts by weight:

[0060] Epoxy resin EP862 100 parts

[0061] 2E4MZ-CN 60 copies

[0062] Silver acetate 40 parts

[0063] Silver flakes (2μm) 800 parts

[0064] graphite 5 parts

[0065] Dissolve epoxy resin EP862 and silver acetate in acetonitrile s...

Embodiment 3

[0068] (1) Preparation of graphene:

[0069] Accurately weigh 0.2g of expanded graphite powder, add it to a three-necked flask filled with organic solvent acetone and 2E4MZ, after mixing, put it into an ultrasonic instrument at 40°C for 4 hours, let it stand for 12 hours, take out the upper suspension solution, add acetonitrile again Dilute, centrifuge the diluted solution at a rate of 4000r / min for 20min to obtain a uniformly dispersed black transparent graphene suspension, and carry out vacuum distillation on the graphene suspension to remove most of the acetonitrile solvent. A graphene solution is obtained to obtain a graphene solution.

[0070] (2) Preparation of conductive adhesive:

[0071] Configure the conductive glue by the stated parts by weight:

[0072] Epoxy resin EP862 100 parts

[0073] 2E4MZ 41.5 parts

[0074] Silver acetate 30 parts

[0075] Silver flakes (2μm) 800 parts

[0076] graphite 2 parts

[0077] Dissolve epoxy resin EP862 and silver acetate i...

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Abstract

The invention discloses a preparation method of a graphene / nano silver epoxy conductive adhesive, which comprises the following steps: (1) mixing graphite, promoter and organic solvent, then carrying out ultrasonic treatment at 20-50 DEG C for 3-6 hours, standing for 12 hours, centrifuging, and distilling; (2) dissolving epoxy resin and precursor in organic solvent, stirring at 20-50 DEG C for 5-30 minutes, adding a graphene solution to continue reacting for 10-40 minutes, distilling, and carrying out ultrasonic treatment for 5-20 minutes; and (3) adding silver sheets into the graphene-nano silver epoxy resin compound, and carrying out ultrasonic treatment to react at 20-60 DEG C for 30-120 minutes so as to obtain the graphene / nano silver epoxy conductive adhesive. The graphene / nano silver epoxy conductive adhesive disclosed by the invention ensures that the graphene-nano silver compound can be uniformly dispersed in the epoxy matrix, and avoids the problem that the prepared graphene conglobates when the epoxy resin is added, thereby being beneficial to realizing the low-temperature sintering of the nano silver and improving the conductivity and adhesive strength of the conductiveadhesive.

Description

technical field [0001] The invention relates to the in-situ preparation of graphene-nano-silver composite and its application in epoxy conductive adhesive, in particular to a preparation method of graphene / nano-silver epoxy conductive adhesive. Background technique [0002] Graphene, a new two-dimensional carbon material, was obtained by Novoselov from the University of Manchester in 2004 by using adhesive tape to peel off highly directional cracked graphite, which immediately set off a research boom in the scientific community. The theoretical specific surface area of ​​graphene material is as high as 2600m 2 / g, with outstanding thermal conductivity (3000 W / (m K)) and mechanical properties (1060GPa), as well as high-speed electron mobility (15000cm2 / (V s)) at room temperature. Graphene's special structure makes it have a series of properties such as perfect quantum tunneling effect, half-integer quantum Hall effect, and never-disappearing conductivity. Professor Geim, wh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J163/00C09J163/02C09J9/02
Inventor 刘岚刘孔华罗远芳贾德民高宏
Owner SOUTH CHINA UNIV OF TECH
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