Preparation method and application of boron nitride/graphene/polyimide composite wave-absorbing and heat-conducting material

A technology of ene polyimide and heat-conducting materials, which is applied in the field of preparation of boron nitride-graphene polyimide composite wave-absorbing heat-conducting materials, can solve problems such as low efficiency, energy waste, and heat loss, and achieve cost reduction and temperature rise The effect is obvious and the effect of reducing heat loss

Active Publication Date: 2020-05-19
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] 1) The structural design includes a wave-absorbing layer, a heat-conducting layer, and a large amount of heat energy will be los

Method used

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  • Preparation method and application of boron nitride/graphene/polyimide composite wave-absorbing and heat-conducting material
  • Preparation method and application of boron nitride/graphene/polyimide composite wave-absorbing and heat-conducting material
  • Preparation method and application of boron nitride/graphene/polyimide composite wave-absorbing and heat-conducting material

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preparation example Construction

[0035] A preparation method of boron nitride graphene polyimide composite wave-absorbing heat-conducting material of the present invention comprises the following steps:

[0036] S1. Weigh and mix boron nitride powder and graphene powder. 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 300-500rad / min, and the time is 1.5-2.5h;

[0037] 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.

[0038] 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 fractio...

Embodiment 1

[0050](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 300rad / min, and the time is 2.5h.

[0051] (2) To prepare the precursor of polyimide material, weigh 1.013g of 4,4'-diaminodiphenyl ether, add it to 12g of N,N-dimethylacetamide, magnetically stir for 2h, then add 1.104g of Phenylenetetracarboxylic dianhydride, stirred by magnetic force for 10h.

[0052] (3) Put the solution prepared in step (1) into a blast oven to dry for 10 hours to obtain a boron nitride / graphene composite powder, press a hydraulic press for tableting, a mold with a diameter of 16mm, and a pressure of 6Mpa for 10min, take it out and add it dropwise (2) The polyimide precursor solution prepared in (2) until the entire sheet is infiltrated.

[0053] (4) Put the composite material into the horse boiling furnace, set the initial temperature to 25°C, raise the temperature t...

Embodiment 2

[0056] (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 500rad / min, and the time is 1.5h.

[0057] (2) To prepare the precursor of polyimide material, weigh 1.013g of 4,4'-diaminodiphenyl ether, add it to 12g of N,N-dimethylacetamide, magnetically stir for 2h, then add 1.104g of Phenylenetetracarboxylic dianhydride, stirred by magnetic force for 10h.

[0058] (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 a hydraulic press for tableting, a mold with a diameter of 16mm, and a pressure of 10Mpa for 10 minutes, take it out and add it dropwise (2) The polyimide precursor solution prepared in (2) until the entire sheet is infiltrated.

[0059] (4) Put the composite material into the horse boiling furnace, set the initial temperature at 25°C, raise the temper...

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Abstract

The invention discloses a preparation method and application of a boron nitride/graphene/polyimide composite wave-absorbing and heat-conducting material. The preparation method comprises the followingsteps: weighing boron nitride powder and graphene powder, mixing, adding absolute ethyl alcohol, and carrying out ball-milling treatment; preparing a precursor of a polyimide material, adding diamineinto a polar solvent, magnetically stirring uniformly, and adding dianhydride; drying the prepared solution to obtain boron nitride/graphene composite powder, tabletting the boron nitride/graphene composite powder, and dropwise adding the prepared polyimide precursor solution after tabletting until the whole tablet is infiltrated; and heating and curing the obtained composite material twice to obtain the boron nitride/graphene/polyimide composite wave-absorbing and heat-conducting material. According to the invention, the integration of wave-absorbing and heat-transferring materials is achieved, the heat energy loss in the heating process is reduced, the heating effect is obvious, the mass volume is small, the cost is low and the mechanical property is improved. The invention provides a new method for microwave heating of non-wave-absorbing materials.

Description

technical field [0001] The invention belongs to the technical field of preparation and heat treatment of boron nitride, graphene and polyimide materials, and specifically relates to a preparation method and application of a boron nitride graphene polyimide composite wave-absorbing heat-conducting material. Background technique [0002] Microwave heating technology uses the characteristic that polar molecules can interact with microwave electromagnetic fields. The polar molecules in the heated object are polarized and alternate orientations with the change of the polarity of the external alternating electromagnetic field. The friction loss between each other makes the electromagnetic energy into Rapid heating technology of thermal energy. For non-polar molecules, using microwaves to heat requires other methods, and devices and methods have been known before. [0003] However, in the existing devices, the wave-absorbing part is placed on the outer layer, and the heat transfer...

Claims

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Application Information

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IPC IPC(8): C08G73/10C08K3/38C08K3/04C09K3/00C09K5/14
CPCC08G73/1071C08G73/1007C08K3/38C08K3/042C09K3/00C09K5/14C08K2003/385
Inventor 韩晓刚杨超杨恒瑞李曼妮郭伟昌沈飞
Owner XI AN JIAOTONG UNIV
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