A preparation method of graphene-boron nitride nanotube thermally conductive filler and oriented thermally conductive composite material
A boron nitride nanotube and thermally conductive composite material technology, applied in the field of composite materials, can solve problems such as poor thermal conductivity, and achieve the effects of reducing phonon scattering, improving thermal conductivity, and improving interlayer thermal conductivity
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[0029] An embodiment of the present invention provides a method for preparing a graphene-boron nitride nanotube thermally conductive filler, comprising the following steps:
[0030] Step S1, preparing an aqueous graphene solution;
[0031] Step S2, adding urea and boric acid into the graphene aqueous solution to react to obtain an intermediate product;
[0032] Step S3, calcining the intermediate product under a protective atmosphere to obtain a graphene-boron nitride nanotube thermally conductive filler (hereinafter referred to as EG-BN thermally conductive filler).
[0033] In this embodiment, the raw materials urea and boric acid used for the synthesis of boron nitride are mixed with graphene aqueous solution and then calcined. The boron nitride nanotubes grown in situ grow on the surface of graphene, and are connected with graphene by C-N bonds. The graphene and boron nitride nanotubes are connected by a covalent bond, which reduces the interfacial thermal resistance of t...
Embodiment 1
[0044] This embodiment provides a method for preparing a graphene-boron nitride nanotube thermally conductive filler, comprising the following steps:
[0045] 1.1 Electric strip 0.2g graphite foil at normal temperature and pressure, 10V voltage, in which the electrolyte is 0.1M (NH 4 ) 2 SO 4 Aqueous solution, after the electrostripping reaction is completed, the product is washed and dispersed in 70mL water, and ultrasonicated in an ice bath for 30min to obtain a graphene aqueous solution;
[0046] 1.2 Weigh 40g of urea and dissolve it in 100ml of water, add 1g of boric acid and stir at room temperature for 12h, add ultrasonic graphene aqueous solution and stir for 5h, centrifuge the obtained product at 10,000r for 10min, remove the supernatant, take the lower layer and dry it in vacuum at 70°C, get intermediate products;
[0047] 1.3 Calcinate the dried intermediate product at 900°C for 5 hours under a nitrogen atmosphere to obtain EG-BN thermally conductive filler.
Embodiment 2
[0049] This embodiment provides a method for preparing a graphene-boron nitride nanotube thermally conductive filler, comprising the following steps:
[0050] 2.1 Electro-peel 0.1g graphite foil at normal temperature and pressure, 10V voltage, in which the electrolyte is 0.1M (NH 4 ) 2 SO 4 Aqueous solution, after the electrostripping reaction is completed, the product is washed and dispersed in 70mL water, and ultrasonicated in an ice bath for 30min to obtain a graphene aqueous solution;
[0051] 2.2 Weigh 35g of urea and dissolve it in 100ml of water, add 0.8g of boric acid and stir at room temperature for 12h, add ultrasonic graphene aqueous solution and stir for 5h, the obtained product is centrifuged at 10000r for 10min, remove the supernatant, and take the lower layer and dry it under vacuum at 70°C , to get the intermediate product;
[0052] 2.3 Calcinate the dried intermediate product at 900°C for 5 hours under a nitrogen atmosphere to obtain EG-BN thermally conduct...
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