Modified boron nitride nano-tube material and preparation method thereof
A boron nitride nanotube and modification technology, applied in the field of materials, can solve the problems of difficulty in preparing high-toughness, high-strength concrete, limited improvement range, concrete shrinkage, creep and brittleness increase, and achieve excellent thermal stability and chemical stability, high tensile strength and elastic modulus, and the effect of good micro-interface combination
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Embodiment 1
[0037] To prepare modified boron nitride nanotube materials, boron nitride nanotubes need to be activated first, and the specific steps are as follows:
[0038] C1, select 8 kg of boron nitride nanotubes, and after ball milling for 24 hours under the condition that the rotating speed is 350 rpm and automatically change the direction of rotation every 30 minutes, the boron nitride nanotubes with an average length of 1.2 μm are obtained; It was dried in vacuum at ℃ for 30 h before use.
[0039] C2. Mix 3 kg of boron nitride nanotubes and 10 kg of thionyl chloride treated in the above step C1 in 15 L of N-methylpyrrolidone, stir at 85 ° C for 5 h, centrifuge at 6000 rpm for 35 min, separate the solid and After washing with anhydrous acetone, vacuum-dry at 25°C for 18 hours;
[0040] C3. Under the protection of nitrogen, mix 3kg of boron nitride nanotubes, 2L of pyridine and 0.5kg of ethylene glycol in 100L of N-methylpyrrolidone treated in step C2 above, react at 85°C for 10h, a...
Embodiment 2
[0054] To prepare modified boron nitride nanotube materials, boron nitride nanotubes need to be activated first, and the specific steps are as follows:
[0055] C1, select 8 kg of boron nitride nanotubes, and after ball milling for 30 hours under the condition that the rotating speed is 380 rpm and the direction of rotation is automatically switched every 35 minutes, the boron nitride nanotubes with an average length of 0.8 μm are obtained; It was dried in vacuum at ℃ for 35 h before use.
[0056] C2. Mix 4.5 kg of boron nitride nanotubes and 12 kg of thionyl chloride treated in the above step C1 in 20 L of N,N'-dimethylformamide, stir at 88 ° C for 10 h, and then rotate at 6000 rpm Centrifuge for 40 minutes, separate the solid and wash it with anhydrous acetone, then dry it under vacuum at 29°C for 20 hours;
[0057] C3. Under the protection of nitrogen, mix 5 kg of boron nitride nanotubes treated in the above step C2, 5 L of pyridine, and 0.9 kg of 1,3-propanediol in 150 L ...
Embodiment 3
[0071] To prepare modified boron nitride nanotube materials, boron nitride nanotubes need to be activated first, and the specific steps are as follows:
[0072] C1. Choose 8 kg of boron nitride nanotubes, and after ball milling for 36 hours under the condition that the rotating speed is 400 rpm and the direction of rotation is automatically changed every 40 minutes, the boron nitride nanotubes with an average length of 0.5 μm are obtained; It was dried in vacuum at ℃ for 32 h before use.
[0073]C2. Put 6kg of boron nitride nanotubes and 15kg of thionyl chloride treated in the above step C1 in 25L of N,N'-dimethylformamide, stir at 90°C for 12h, then centrifuge at 6000rpm for 38min , separated the solid and washed it with anhydrous acetone, then dried it under vacuum at 30°C for 19h;
[0074] C3. Under the protection of nitrogen, mix 6 kg of boron nitride nanotubes treated in the above step C2 with 8 L of pyridine and 1.5 kg of 1,3-propanediol in 120 L of N-methylpyrrolidone,...
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