Heat conducting adhesive and preparation method thereof
A heat-conducting adhesive and acrylic glue technology, applied in the direction of adhesives, adhesive additives, non-polymer adhesive additives, etc., can solve the problems of poor adaptability to high heat dissipation environments, high heat dissipation, and low thermal conductivity of heat-conducting adhesives, and achieve easy scale-up Mass production, good thermal uniformity and high thermal conductivity
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[0034] The preparation method of described graphene oxide is: get 2.0 ~ 5.0g graphite powder and 1.0 ~ 2.0g sodium nitrate and join in the concentrated sulfuric acid that 46 ~ 60ml mass fraction is 98%, the mixture is placed in ice bath and stirred for 30 ~ 60min; weigh 6.0~15.0g of potassium permanganate and slowly add to the above mixture, and stir rapidly for 2~5h at 0~5°C; move the mixture into a warm water bath at 35°C and continue stirring for 3~6h; slowly drop Add 90~150ml of distilled water to the mixture, and control the temperature at 98°C for 30min~60min; cool to room temperature, add 30% hydrogen peroxide to remove excess potassium permanganate until the mixture turns bright yellow; add 150~ Dilute with 300ml of distilled water and filter while hot, wash with hydrochloric acid with a molar concentration of 0.01mol / L, absolute ethanol, and deionized water in sequence until there is no sulfate ion in the filtrate, and the solution is neutral. Graphite oxide is obtaine...
Embodiment 1
[0042] A thermally conductive adhesive, which is made of the following raw materials in weight percentage: 70% of acrylic glue, 20% of modified aluminum nitride, 5% of graphene oxide, 3% of tackifying resin, and 2% of dispersant.
[0043] The viscosity of the acrylic glue is 500-1500cps, and the solid content is 100%.
[0044] The preparation method of the modified aluminum nitride is as follows: dissolving aluminum nitride nanoparticles in absolute ethanol, using ultrasonic and ball milling methods to graft silane coupling agent to the surface of aluminum nitride nanoparticles, and through rotary evaporation Remove dehydrated alcohol, obtain modified aluminum nitride particles after drying, wherein, the silane coupling agent is KH-560, and the mass ratio of the silane coupling agent to the aluminum nitride nanoparticles is 7-15: 100, the power of the ultrasonic wave is 1KW, and the ultrasonic time is more than 15 minutes; the conditions of the ball mill are: the speed of the ...
Embodiment 2
[0055] Based on Example 1, the only difference is that the thermally conductive adhesive in this example is made of the following raw materials by weight percentage: 70% acrylic glue, 25% modified aluminum nitride, 3% graphene oxide, and 1% tackifying resin %, and dispersant 1%.
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