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
CN111171318AActive Publication Date: 2020-05-19XI AN JIAOTONG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
XI AN JIAOTONG UNIV
Publication Date
2020-05-19

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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.
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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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