Carbonaceous material high-temperature wave-absorbing composite material and preparation method thereof

Abstract

The invention belongs to the technical field of wave-absorbing materials, and particularly relates to a carbonaceous material high-temperature wave-absorbing composite material and a preparation method thereof. The preparation method comprises the following steps of: adding PVP into a ferrous sulfate aqueous solution, stirring and dissolving, rapidly pouring a sodium borohydride aqueous solution,continuously stirring, separating out ferrite, and washing for later use; performing polymerization reaction on acrylonitrile, itaconic acid, an initiator and an organic solvent under a constant-temperature condition to obtain a polymerization mixed solution; adding the ferrite into the polymerization mixed solution, stirring and reacting under a constant-temperature water bath condition, adding adispersing agent and graphene micro powder, and dispersing at a high speed to obtain a composite precursor solution; preparing the composite precursor solution into blended fibers by utilizing wet spinning equipment; and pre-oxidizing the blended fibers, heating to 800 DEG C for roasting, and cooling to room temperature to obtain the wave-absorbing composite material. The defects in the prior artare overcome, and the wave-absorbing composite material with wide absorption frequency band, high absorption strength and high temperature resistance is provided.

Description

technical field

[0001] The invention belongs to the technical field of wave-absorbing materials, and in particular relates to a carbonaceous high-temperature wave-absorbing composite material and a preparation method thereof. Background technique

[0002] Absorbing materials refer to a class of materials that can absorb and attenuate incident electromagnetic waves, convert electromagnetic energy into heat energy and dissipate it, or make electromagnetic waves disappear through interference effects. The development of high-performance absorbing materials is of great significance in the fields of national defense, military affairs and wireless communication technology.

[0003] To improve the efficiency of microwave absorbing materials, microwave absorbing materials that can produce multiple loss mechanisms should be constructed, so that as much electromagnetic waves as possible can enter the interior of the material for attenuation, so as to achieve the requirements of strong...

Examples

Embodiment 1

[0032] A method for preparing a carbonaceous material high-temperature wave-absorbing composite material, comprising the following steps:

[0033] (1) Add 20g of PVP to 800ml of 0.01mol / L ferrous sulfate aqueous solution, stir and dissolve, then quickly pour 400ml of prepared 0.03mol / L sodium borohydride aqueous solution, and continue to stir until the solution turns black, and the iron oxide is separated body, and washed for later use;

[0034] (2) Use 120ml of acrylonitrile as the first monomer, 6.5g of itaconic acid as the comonomer, then add 0.72g of azobisisobutyronitrile and 250ml of methyl sulfoxide, and polymerize at a constant temperature of 62°C for 24 hours. Obtain a polymerization mixture;

[0035] (3) Add the ferrite obtained in step (1) to the polymerization mixture obtained in step (2), stir and react in a constant temperature water bath at 62°C, and add silane coupling agent and 100-mesh graphene to the reaction system Micropowder 10g, after high-speed disper...

Embodiment 2

[0045] A method for preparing a carbonaceous material high-temperature wave-absorbing composite material, comprising the following steps:

[0046] (1) Add 16g of PVP to 800ml of 0.02mol / L ferrous sulfate aqueous solution, stir and dissolve, then quickly pour 400ml of prepared 0.03mol / L sodium borohydride aqueous solution, and continue stirring until the solution turns black, and the iron oxide is separated body, and washed for later use;

[0047] (2) Use 120ml of acrylonitrile as the first monomer, 6.5g of itaconic acid as the comonomer, then add 0.72g of azobisisobutyronitrile and 250ml of methyl sulfoxide, and polymerize at a constant temperature of 62°C for 24 hours. Obtain a polymerization mixture;

[0048] (3) Add the ferrite obtained in step (1) to the polymerization mixture obtained in step (2), stir and react in a constant temperature water bath at 62°C, and add silane coupling agent and 140 mesh graphene to the reaction system Micropowder 8g, obtain composite precur...

Embodiment 3

[0058] A method for preparing a carbonaceous material high-temperature wave-absorbing composite material, comprising the following steps:

[0059] (5) Add 13.3g of PVP to 800ml of 0.03mol / L ferrous sulfate aqueous solution, stir to dissolve, quickly pour 400ml of prepared 0.03mol / L sodium borohydride aqueous solution, and continue stirring until the solution turns black, and iron is separated Oxygen body, and wash it for later use;

[0060] (6) 120ml of acrylonitrile was used as the first monomer, 6.5g of itaconic acid was used as the comonomer, and then 0.72g of azobisisobutyronitrile and 250ml of methyl sulfoxide were added, and the polymerization reaction was carried out at a constant temperature of 62°C for 24 hours. Obtain a polymerization mixture;

[0061] (7) Add the ferrite obtained in step (1) to the polymerization mixture obtained in step (2), stir and react under the condition of constant temperature water bath at 62°C, and add silane coupling agent and 140 mesh gr...

technical field

[0001] The invention belongs to the technical field of wave-absorbing materials, and in particular relates to a carbonaceous high-temperature wave-absorbing composite material and a preparation method thereof. Background technique

[0002] Absorbing materials refer to a class of materials that can absorb and attenuate incident electromagnetic waves, convert electromagnetic energy into heat energy and dissipate it, or make electromagnetic waves disappear through interference effects. The development of high-performance absorbing materials is of great significance in the fields of national defense, military affairs and wireless communication technology.

[0003] To improve the efficiency of microwave absorbing materials, microwave absorbing materials that can produce multiple loss mechanisms should be constructed, so that as much electromagnetic waves as possible can enter the interior of the material for attenuation, so as to achieve the requirements of strong...

Examples

Embodiment 1

[0032] A method for preparing a carbonaceous material high-temperature wave-absorbing composite material, comprising the following steps:

[0033] (1) Add 20g of PVP to 800ml of 0.01mol / L ferrous sulfate aqueous solution, stir and dissolve, then quickly pour 400ml of prepared 0.03mol / L sodium borohydride aqueous solution, and continue to stir until the solution turns black, and the iron oxide is separated body, and washed for later use;

[0034] (2) Use 120ml of acrylonitrile as the first monomer, 6.5g of itaconic acid as the comonomer, then add 0.72g of azobisisobutyronitrile and 250ml of methyl sulfoxide, and polymerize at a constant temperature of 62°C for 24 hours. Obtain a polymerization mixture;

[0035] (3) Add the ferrite obtained in step (1) to the polymerization mixture obtained in step (2), stir and react in a constant temperature water bath at 62°C, and add silane coupling agent and 100-mesh graphene to the reaction system Micropowder 10g, after high-speed disper...

Embodiment 2

[0045] A method for preparing a carbonaceous material high-temperature wave-absorbing composite material, comprising the following steps:

[0046] (1) Add 16g of PVP to 800ml of 0.02mol / L ferrous sulfate aqueous solution, stir and dissolve, then quickly pour 400ml of prepared 0.03mol / L sodium borohydride aqueous solution, and continue stirring until the solution turns black, and the iron oxide is separated body, and washed for later use;

[0047] (2) Use 120ml of acrylonitrile as the first monomer, 6.5g of itaconic acid as the comonomer, then add 0.72g of azobisisobutyronitrile and 250ml of methyl sulfoxide, and polymerize at a constant temperature of 62°C for 24 hours. Obtain a polymerization mixture;

[0048] (3) Add the ferrite obtained in step (1) to the polymerization mixture obtained in step (2), stir and react in a constant temperature water bath at 62°C, and add silane coupling agent and 140 mesh graphene to the reaction system Micropowder 8g, obtain composite precur...

Embodiment 3

[0058] A method for preparing a carbonaceous material high-temperature wave-absorbing composite material, comprising the following steps:

[0059] (5) Add 13.3g of PVP to 800ml of 0.03mol / L ferrous sulfate aqueous solution, stir to dissolve, quickly pour 400ml of prepared 0.03mol / L sodium borohydride aqueous solution, and continue stirring until the solution turns black, and iron is separated Oxygen body, and wash it for later use;

[0060] (6) 120ml of acrylonitrile was used as the first monomer, 6.5g of itaconic acid was used as the comonomer, and then 0.72g of azobisisobutyronitrile and 250ml of methyl sulfoxide were added, and the polymerization reaction was carried out at a constant temperature of 62°C for 24 hours. Obtain a polymerization mixture;

[0061] (7) Add the ferrite obtained in step (1) to the polymerization mixture obtained in step (2), stir and react under the condition of constant temperature water bath at 62°C, and add silane coupling agent and 140 mesh gr...

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