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A kind of preparation method of electromagnetic shielding material

An electromagnetic shielding material and wood technology, applied in the field of new biomass-derived magnetic carbon materials and their manufacturing, can solve the problems of high raw material cost, high cost, unsuitable for industrialized mass production, etc., and achieve the effect of reducing industrial costs.

Inactive Publication Date: 2021-02-26
NANJING FORESTRY UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, due to the limitation of the preparation method of magnetic materials and the cost of carbon materials, this type of method is not suitable for industrial mass production and the cost is high, so the current social utilization rate is low.
At the same time, this type of method cannot guarantee the uniform dispersion of magnetic materials and carbon materials, and the electromagnetic wave absorption performance of different batches of products may vary
[0004] In 2016, Zhao Haibo et al. prepared a nickel / carbon magnetic foam composite material by high-temperature pyrolysis of polymer microspheres containing divalent nickel. Studies have shown that this material has good electromagnetic wave shielding properties (Hai-Bo Zhao et al., Excellent Electromagnetic Absorption Capability of Ni / Carbon Based Conductive and Magnetic Foams Synthesized via a Green One Pot Route, ACS Applied Materials & Interfaces, 2016, 8, 1468-1477), in this method, the carbon source is polymer microspheres, which also require higher raw materials cost

Method used

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  • A kind of preparation method of electromagnetic shielding material
  • A kind of preparation method of electromagnetic shielding material
  • A kind of preparation method of electromagnetic shielding material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A method for preparing an electromagnetic shielding material, comprising the steps of:

[0040] Step 1, processing the wood into wood chips with uniform thickness, length and width, the length of the wood chips is 3-6 cm, the width is 3-6 cm, and the thickness is 1-3 mm;

[0041] Step 2: Put the wood chips in a mixed solution of water and ethanol (volume ratio of ethanol and water: 2:1) and ultrasonically wash them for 3 hours, then take them out for heating and drying at 70°C, and dry until the moisture content of the wood chips reaches 3 to 5%, to obtain pretreated wood chips;

[0042] Step 3, dissolving iron acetylacetonate in acetone, an organic solvent, to prepare an impregnating solution of iron acetylacetonate with a concentration of 0.025 g / mL;

[0043] Step 4, place the wood chips pretreated in step 2 in the iron acetylacetonate impregnation solution, incubate for 1 hour under vacuum (vacuum degree is 0.08MPa); then pressurize under nitrogen protection (nitrog...

Embodiment 2

[0048] The concentration of the iron acetylacetonate impregnation solution was 0.02g / mL, and the rest of the process was the same as in Example 1.

Embodiment 3

[0050] The concentration of the iron acetylacetonate impregnation solution is 0.03g / mL, and the rest of the process is the same as in Example 1.

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Abstract

The invention relates to a preparation method of an electromagnetic shielding material, which comprises processing wood into uniform wood chips; placing them in a mixed solution of water and ethanol for ultrasonic vibration, taking them out and drying them; preparing an impregnation solution for iron acetylacetonate; placing the pretreated wood chips in Incubate in the iron acetylacetonate impregnation solution under vacuum for 0.5-2 hours; then under the protection of nitrogen, pressurize and impregnate; take out the impregnated wood chips, gently rinse the surface with ethanol, and let it stand at room temperature for 1-2 hours 2 hours, and then vacuum-dried; finally placed in a nitrogen-protected tube furnace for step-by-step high-temperature pyrolysis, the product was taken out, crushed and sieved to obtain the product. The method uses biomass raw materials as a carbon source to prepare magnetic carbon powder, and the magnetic material is uniformly dispersed in the carbon powder; at the same time, this magnetic carbon powder has electromagnetic wave shielding properties, and to a certain extent, the product electromagnetic wave The shielding performance is controllable; and the cost is low, which is suitable for industrial production.

Description

technical field [0001] The invention relates to the technical field of manufacturing electromagnetic shielding materials, in particular to a novel biomass source magnetic carbon material with controllable electromagnetic wave absorption performance and a manufacturing method thereof. Background technique [0002] With the rapid growth of applications of wireless electronic devices such as mobile phones, local area networks, and home robots, people's daily life and production are increasingly affected by electromagnetic waves generated by electromagnetic systems. Controllable and other characteristics of the absorbing material. Because magnetic carbon materials have both good magnetism and electrical conductivity, they can be used as magnetic dielectric materials with both dielectric loss and magnetic loss, and have potential applications as excellent electromagnetic wave absorbing materials. [0003] At present, the common method for preparing magnetic carbon materials is t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K3/00
CPCC09K3/00
Inventor 娄志超周明毛顿宋健月蒋怡彬蔡家斌
Owner NANJING FORESTRY UNIV
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