Azacarbon/nano metal wire composite material and preparation method for electromagnetic shielding

A nano metal wire and composite material technology, applied in the fields of magnetic field/electric field shielding, electrical components, etc., can solve the problems of low reflectivity, cumbersome operation, complicated process, etc., and achieve enhanced aromatization, simple process, and simplified post-processing process. Effect

Active Publication Date: 2020-12-15
武汉中科先进材料科技有限公司
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Problems solved by technology

[0003] Biomass is a renewable green and clean resource, which is often used by researchers to develop new composite materials. In the research of electromagnetic shielding applications, it is rare to use biomass, a carbon material, combined with metal materials to prepare composite materials. , the patent literature of CN108659470A discloses a preparation method of epoxy resin-based porous electromagnetic shielding composite material, using straw as a template, loading titanium dioxide precursor, and then sintering at a high temperature to prepare biomass charcoal at a pyrolysis temperature of 480-550°C / titanium dioxide composite filler, so that the composite filler is uniformly dispersed in the resin matrix, the prepared composite electromagnetic shielding material can form a relatively regular and uniform pore structure, the interfacial bonding force of the composite material is better, and the biochar / titanium dioxide composite filler and carbon nano Tube compounding can form a biochar-titanium dioxide-carbon nanotube conductive network structure, but the process is complicated and the raw materials are various
The patent literature of CN102395258A discloses a preparation method of a porous structure composite material for electromagnetic shielding, which adopts mixed pressure solidification molding of biomass material and granular pore-forming agent, creates pores at high temperature under anaerobic conditions and sinters to obtain electromagnetic shielding. Shielding composite materials, the process requires the role of pore-forming agents, and no metal materials are used
CN1484486A discloses a preparation method of electromagnetic shielding composite material, which is characterized in that the wooden material is catalytically carbonized and coated with a resin coating on the surface to prepare an electromagnetic shielding material with high absorption and low reflection ability. Due to the need to impregnate magnetic metal salt and subsequent resin coating processing, the operation is more cumbersome

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  • Azacarbon/nano metal wire composite material and preparation method for electromagnetic shielding
  • Azacarbon/nano metal wire composite material and preparation method for electromagnetic shielding
  • Azacarbon/nano metal wire composite material and preparation method for electromagnetic shielding

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Embodiment 1

[0044] This embodiment provides a nitrogen heterocarbon material nano-metal wire composite material and its preparation, and the technical scheme is as follows:

[0045] (1) Select white silkworm silk as the biomass material, which is often washed with warm ultrasonic water and dried in an incubator. The biomass material silkworm cocoon is preferably Lepidoptera (Lepidoptera) Bombycidae (Bombycidae), and there is a certain amount of metal potassium, Calcium, magnesium, iron, manganese, zinc, nickel, among which the biomass material silkworm cocoon contains a large amount of crystallized and non-crystallized proteins (the sum accounts for 96% of the total mass), and the presence of metals is beneficial to the activation of materials during pyrolysis , azacarbons can be formed after protein pyrolysis;

[0046] (2) The reaction boat is placed in the furnace, and then the furnace is purged with inert gas for 5 minutes at an inert gas flow rate of 500ml / min, and purged three times;...

Embodiment 2

[0061] The method of this example is basically the same as that of Example 1, except that in step (3) the tube furnace is used to control the temperature at 1000°C, and azacarbon materials can also be successfully prepared, and according to the requirements of the following steps, A biomass-based carbon-nitrogen-phosphorus composite fiber material was obtained. The composite fiber material was a grooved layered azacarbon fiber, and the introduced silver seed was an isopropanol dispersion containing silver wires of uniform size with a length of 8 μm and a diameter of 70 nm. After the secondary growth, the silver wire has a diameter of 70nm and a length of millimeter order, and is wound to the carbon material base fiber.

Embodiment 3

[0063] The method of this embodiment is basically the same as that of Example 1, except that in step (3), the tube furnace is used to control the temperature at 650° C., and the reaction system is glycerol. The azacarbon material can also be successfully prepared, and according to the requirements of the following steps, a biomass-based carbon nitrogen phosphorus composite fiber material is obtained. The composite fiber material is a grooved layered azacarbon fiber. 8μm, 75nm diameter uniform size silver wire dispersion in isopropanol. After the secondary growth, the silver wire has a diameter of 75nm and a length of millimeter order, and is wound to the carbon material base fiber.

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Abstract

The invention relates to a slotted layered nitrogen-doped carbon / nano metal wire composite material for electromagnetic shielding and a preparation method thereof. The composite material is prepared by a solvothermal method using a biomass directly pyrolyzed and carbonized as a substrate and a precursor solution of nano metal wires, which belongs to the technical field of heteroatom carbon and metal composite material production. The directly-pyrolyzed and carbonized heteroatom-containing carbon material is used as the substrate, the pre-prepared nano metal wire dispersion liquid is used as aseed liquid, the liquid is dripped on the carbon material, is dried and is put to the metal wire preparation precursor solution, and through secondary solvothermal growth, a nitrogen-doped carbon / nanometal wire composite material with nano metal wires wrapped for electromagnetic shielding is obtained.

Description

technical field [0001] The invention relates to a grooved layered azacarbon / nano metal wire composite material used for electromagnetic shielding and a preparation method thereof. The composite material is directly pyrolyzed and carbonized by biomass as a precursor solution solvent heat of the substrate and the nano metal wire. The method is prepared, and belongs to the technical field of production of heteroatom carbon and metal composite materials. Background technique [0002] With the advancement of science and technology and the improvement of living standards, the wide application of electronic computers, household appliances, communication equipment, medical equipment, high-voltage transmission network, etc., brings convenience and pollution of electromagnetic radiation, making electromagnetic technology a A double-edged sword. The research on electromagnetic shielding materials has practical significance for people's health and national security. Conductors commonl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05K9/00
CPCH05K9/0081
Inventor 喻学锋王昀黄浩康翼鸿
Owner 武汉中科先进材料科技有限公司
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