Preparation method and application of boron nitride graphene polyimide composite wave-absorbing heat-conducting material
A technology of ene polyimide and thermal conductive material is applied in the field of preparation of boron nitride graphene polyimide composite wave absorbing thermal conductive material, which can solve problems such as low efficiency, energy waste, thermal energy loss, etc., and achieves cost reduction and temperature increase The effect is obvious, the effect of reducing heat loss
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[0034] A preparation method of boron nitride graphene polyimide composite wave-absorbing heat-conducting material of the present invention comprises the following steps:
[0035] S1. Weigh boron nitride powder and graphene powder and mix them. The mass ratio of boron nitride and graphene is 1: (0.01~0.02). Add absolute ethanol and put it into a ball mill tank for ball milling. Add to four-fifths of the ball mill tank, set the speed at 300~500 rad / min, and the time is 1.5~2.5h;
[0036] Graphene includes at least one of expanded graphite, thermally exfoliated graphene, mechanically exfoliated graphene, liquid phase exfoliated graphene, high temperature carbonized graphene, 3D graphene, graphene oxide, reduced graphene oxide and CVD graphene.
[0037] S2. To prepare the precursor of the polyimide material, add the diamine into the polar solvent, stir it evenly and then add the dibasic anhydride. The molar ratio of the dibasic amine to the dibasic anhydride is 1:1, and the mass f...
Embodiment 1
[0049] (1) Weigh 5g of boron nitride powder and 0.05g of graphene powder, mix them in a beaker, add 50ml of absolute ethanol, put them into a ball mill jar for ball milling, set the speed at 300 rad / min, and the time is 2.5h.
[0050](2) To prepare the precursor of polyimide material, weigh 1.013g of 4,4'-diaminodiphenyl ether, add it to 12g of N,N-dimethylacetamide, stir it magnetically for 2h, then add 1.104g of phenylene Tetracarboxylic dianhydride, magnetically stirred for 10h.
[0051] (3) Put the solution prepared in step (1) into a blast oven to dry for 10 hours to obtain boron nitride / graphene composite powder, press it into tablets with a hydraulic press, 16mm diameter mold, 6Mpa pressure for 10min, take it out and add it dropwise (2) The polyimide precursor solution prepared in (2) until the entire sheet is soaked.
[0052] (4) Put the composite material into the horse boiling furnace, set the initial temperature to 25°C, raise the temperature to 100°C for 30 minute...
Embodiment 2
[0055] (1) Weigh 5g of boron nitride powder and 0.1g of graphene powder, mix them in a beaker, add 50ml of absolute ethanol, put them into a ball mill jar for ball milling, set the speed at 500 rad / min, and the time is 1.5h.
[0056] (2) To prepare the precursor of polyimide material, weigh 1.013g of 4,4'-diaminodiphenyl ether, add it to 12g of N,N-dimethylacetamide, stir it magnetically for 2h, then add 1.104g of phenylene Tetracarboxylic dianhydride, magnetically stirred for 10h.
[0057] (3) Put the solution prepared in step (1) into a blast oven and dry for 10 hours to obtain a boron nitride / graphene composite powder, press it into tablets with a hydraulic press, use a mold with a diameter of 16mm, and press 10Mpa for 10 minutes, take it out and add it dropwise (2) The polyimide precursor solution prepared in (2) until the entire sheet is soaked.
[0058] (4) Put the composite material into the horse boiling furnace, set the initial temperature at 25°C, raise the temperat...
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