Modification method of hexagonal boron nitride and hydroxyl modified boron nitride
A hexagonal boron nitride and hydroxyl modification technology, which is applied in the field of hexagonal boron nitride modification and hydroxyl modification of boron nitride, can solve the problems of h-BN surface defect density and types are limited, difficult to control, etc., to achieve Simple and efficient surface modification, easy operation, and the effect of expanding the application range
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Embodiment 1
[0046] The preparation of embodiment 1 hydroxyl modified boron nitride (HO-BN)
[0047] 1) Pretreatment of commodity h-BN powder
[0048] Weigh 2g of commercial h-BN powder into a 250mL round bottom flask, add 80mL of 10% nitric acid solution (65% nitric acid: water = 1:5.5 (v / v)) to it, and put a stirring magnet. Place the round-bottomed flask in an oil bath, start magnetic stirring, heat to 80°C, keep it for 5 hours, and then cool it down to room temperature naturally to obtain a dispersion. Place the dispersion in a high-speed centrifuge (HC-2518), centrifuge the BN particles at a speed of 8000rpm, and rinse with deionized water until the washing liquid is neutral, and the treated product is dried at 50°C with electric blast Dry in the box (GZX-9070MBE) for 24h. FT-IR spectra of BN powder before and after pretreatment as figure 1 as shown, figure 1 is the infrared spectrum of h-BN before and after nitric acid treatment, by figure 1 It can be seen that there is basicall...
Embodiment 2
[0051] The preparation of embodiment 2 hydroxyl modified boron nitride (HO-BN)
[0052] 1) The pretreatment of h-BN powder is the same as in Example 1.
[0053] 2) Preparation of HO-BN
[0054] Weigh 100 mg of h-BN powder treated with nitric acid into a 100 mL round bottom flask, add 50 mL of deionized water, and place it in an ultrasonic disperser to make the powder ultrasonically dispersed. Then 20 μL of formic acid and 1.1 mL of concentrated sulfuric acid were added in turn, and placed in a stirring magnet. The round bottom flask was placed in the cobalt source chamber with an iron stand, magnetic stirring was started, and the radiation was irradiated for 48 hours. The absorbed dose rate was 105.4Gy / min (calibrated with a ferrous sulfate dosimeter), and the total absorbed dose was 303.4kGy. After the irradiation, the round bottom flask was taken out, and after standing for a period of time, the particles were deposited. The upper liquid was poured out, and the precipitat...
Embodiment 3
[0055] The preparation of embodiment 3 epoxy group modified boron nitride (EP-BN)
[0056] 1) The pretreatment of h-BN powder is the same as in Example 1.
[0057] 2) Preparation of HO-BN
[0058] Weigh 100 mg of h-BN powder treated with nitric acid into a 100 mL round bottom flask, add 50 mL of deionized water, and place it in an ultrasonic disperser to make the powder ultrasonically dispersed. Then 20 μL of formic acid and 1.1 mL of concentrated sulfuric acid were added in turn, and placed in a stirring magnet. The round-bottomed flask was fixed in the cobalt source chamber with an iron stand, magnetic stirring was started, and it was irradiated for 18 hours. The absorbed dose rate was 101.3Gy / min (calibrated by ferrous sulfate dosimeter), and the total absorbed dose was 109kGy. After the irradiation, the round bottom flask was taken out, and after standing for a period of time, the particles were deposited. The upper liquid was poured out, and the precipitate was rinsed ...
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