Preparation method and application of high-efficiency graphene heat-dissipation material

[0012] A preparation method and application of a high-efficiency graphene heat dissipation material, the steps are as follows:

[0013] 1. Prepare food antioxidant solution, use one or more of BHA, BHT, THBQ, PG, OG and DG food antioxidants as solute, and use one or more of methanol, ethanol, acetonitrile or isopropanol solution The second is a solvent to prepare a food antioxidant solution containing citric acid;

[0014] 2. To prepare the colloidal solution of graphene oxide, first prepare graphite oxide, mix concentrated sulfuric acid and graphite powder in the reactor evenly, heat to 70-80°C for oxidation for 4 hours, after cooling, sonicate for 2 hours, and then dilute with deionized water , washing and drying to obtain pretreated graphite powder; according to the Hummer oxidation method, it is mixed with concentrated sulfuric acid, sodium nitrate and potassium permanganate to oxidize to prepare fully oxidized graphite oxide, and the preparation method of graphite oxide i...

[0018] Food antioxidant solution is prepared, with ethanol as solvent, BHA and citric acid are added to form 2.7mg / mL BHA ethanol solution, wherein the concentration of citric acid is 1.35mg / mL.

[0019] To prepare a colloidal solution of graphene oxide, weigh 5g of graphite powder solid and 30mL of concentrated sulfuric acid and mix them evenly in a 500mL three-necked flask, heat the oil bath to 80°C for oxidation, take it out and cool it after 4 hours of reaction, and ultrasonicate it at 500W 2 hours, then dilute to 500mL with deionized water, transfer to a 1L container, dilute to 1L with deionized water, filter through a 0.22μm filter, wash with deionized water to 1MBaCl 2 No white precipitate was detected, and then dried at 70° C. for 24 hours to obtain pretreated graphite powder.

[0020] Add the above-mentioned pretreated graphite powder into a 500mL three-necked flask, add 2.5gNaNO 3 and 120mL concentrated sulfuric acid, the three-necked flask was fixed in an ice-water...

[0023] Food antioxidant solution is prepared, with ethanol as solvent, BHA and citric acid are added to form 3.1 mg / mL BHT ethanol solution, wherein the concentration of citric acid is 1.55 mg / mL.

[0024] To prepare a colloidal solution of graphene oxide, weigh 5g of graphite powder solid and 30mL of concentrated sulfuric acid and mix them evenly in a 500mL three-neck flask, heat the oil bath to 80°C for oxidation, take it out and cool it after 4 hours of reaction, and ultrasonicate it at 500W 2 hours, then dilute to 500mL with deionized water, transfer to a 1L container, dilute to 1L with deionized water, filter through a 0.22μm filter, wash with deionized water to 1MBaCl 2 No white precipitate was detected, and then dried at 70° C. for 24 hours to obtain pretreated graphite powder.

[0025] Add the above-mentioned pretreated graphite powder into a 500mL three-necked flask, add 2.5gNaNO 3 and 120mL concentrated sulfuric acid, the three-necked flask was fixed in an ice-water...