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Electromagnetic shielding function primitive material preparation method

A functional base unit and electromagnetic shielding technology, which is applied in the field of shielding material preparation, can solve the problems of unsatisfactory low-frequency shielding effectiveness, lower material mechanical properties, narrow electromagnetic shielding frequency band, etc., and achieve good shielding effect, low raw material cost, and electromagnetic shielding The effect of wide band

Inactive Publication Date: 2016-12-21
雷春生
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  • Abstract
  • Description
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to solve the problem that the electromagnetic shielding frequency band of the existing electromagnetic shielding material is narrow, the shielding efficiency in the low frequency band is not ideal, and the general filler particles are thick, which often greatly reduces the mechanical properties of the material itself while ensuring the shielding effect. In the present invention, the filter residue prepared by using rice husks is silicon oxide particles, and then it is nano-treated to obtain nano-silicon dioxide, and then it is stirred and mixed with ferric nitrate solution, silicon carbide and other substances, and then calcined to obtain The nanocomposite is placed in a sodium hydroxide solution for stirring reaction to obtain a cage-shaped iron nitride and iron nitride / silicon carbide nanocomposite, and finally it is ball milled and mixed with self-made conductive polyaniline to obtain Electromagnetic shielding functional basic material

Method used

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Examples

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Effect test

example 1

[0018] First, weigh 20g of rice husk and crush it, pass through a 300-mesh sieve to obtain rice husk powder, add the rice husk powder to a beaker, add 200mL of hydrochloric acid solution with a mass concentration of 0.1mol / L, soak for 14h, filter, and obtain the filter residue For silicon oxide particles, add silicon oxide particles to 200mL sodium hydroxide solution with a mass concentration of 0.5mol / L, stir for 2 hours, then add 200mL of hydrochloric acid solution with a mass concentration of 1mol / L, stir for 3 hours, and filter to obtain Filter residue, put the filter residue in a muffle furnace, calcinate at 700°C for 4h, and then naturally cool to room temperature to obtain nano-silica; add the above-prepared nano-silica into a three-necked flask, and then add 200mL of 0.1mol / L ferric nitrate solution, 5g silicon carbide, 20mL polyethylene glycol, stir for 20min, then add 10g zinc powder in sequence, stir for 3h, put the reactant in a vacuum oven and dry for 3h, put the d...

example 2

[0020]First, weigh 10g of rice husk and crush it, pass through a 200-mesh sieve to obtain rice husk powder, add the rice husk powder to a beaker, then add 100mL of hydrochloric acid solution with a mass concentration of 0.1mol / L to soak for 12h, filter, and obtain the filter residue For silicon oxide particles, add silicon oxide particles to 100 mL of sodium hydroxide solution with a mass concentration of 0.5 mol / L, stir and react for 1 hour, then add 100 mL of hydrochloric acid solution with a mass concentration of 1 mol / L, stir and react for 2 hours, and filter to obtain Filter residue, put the filter residue in a muffle furnace, calcinate at 600°C for 3h, and then cool naturally to room temperature to obtain nano-silica; add the above-prepared nano-silica into a three-necked flask, and then add 100mL of 0.1mol / L ferric nitrate solution, 3g silicon carbide, 10mL polyethylene glycol, stir for 10min, then add 5g zinc powder in turn, stir for 2h, put the reactant in a vacuum ove...

example 3

[0022] First, weigh 15g of rice husk and crush it, pass through a 250-mesh sieve to obtain rice husk powder, add the rice husk powder to a beaker, then add 150mL of hydrochloric acid solution with a mass concentration of 0.1mol / L and soak for 13h, filter, and obtain the filter residue For silicon oxide particles, add silicon oxide particles to 150 mL of sodium hydroxide solution with a mass concentration of 0.5 mol / L, stir for 1 hour, then add 150 mL of hydrochloric acid solution with a mass concentration of 1 mol / L, stir for 2 hours, and filter to obtain Filter residue, put the filter residue in a muffle furnace, calcinate at 650°C for 3h, and then cool naturally to room temperature to obtain nano-silica; add the nano-silica prepared above into a three-necked flask, and then add 150mL of 0.1mol / L ferric nitrate solution, 4g silicon carbide, 15mL polyethylene glycol, stir for 15min, then add 7g zinc powder in turn, stir for 2h, put the reactant in a vacuum oven and dry for 3h, ...

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Abstract

The invention relates to an electromagnetic shielding function primitive material preparation method, and belongs to the technical field of shielding material preparation. The preparation method comprises: obtaining silicon oxide particles from rice husk, carrying out a nanometer treatment to obtain nanometer silica, carrying out stirring mixing on the nanometer silica, a ferric nitrate solution, silicon carbide and other substances, calcining to obtain a nanometer complex, placing the nanometer complex in a sodium hydroxide solution, carrying out a stirring reaction to obtain a cage-like iron nitride and iron nitride / silicon carbide nanometer mixture, and finally carrying out ball milling mixing on the cage-like iron nitride and iron nitride / silicon carbide nanometer mixture and self-made electric conduction polyaniline to obtain the electromagnetic shielding function primitive material. According to the present invention, the prepared electromagnetic shielding function primitive material has characteristics of wide electromagnetic shielding frequency band and good shielding effect, wherein the electromagnetic shielding frequency band is in a range of 30 MHz-1.0 GHz, the shielding attenuation value achieves 55-65 dB, the strength is high, the tensile strength is more than 35.65 MPa, and the bending strength is more than 55 MPa.

Description

technical field [0001] The invention relates to a preparation method of an electromagnetic shielding functional elementary material, belonging to the technical field of shielding material preparation. Background technique [0002] Due to the widespread application of electromagnetic devices in modern society, more and more electromagnetic interference problems have been brought about. Due to their high stability, easy compatibility and high heat resistance, inorganic composite electromagnetic shielding materials are used as a building to prevent electromagnetic interference. Potential materials in areas such as , communication tools, etc. have attracted widespread attention. Electromagnetic shielding materials not only need to have good performance of reflecting electromagnetic waves, but also need to have good performance of absorbing electromagnetic waves. "Thin, light, wide and strong" composite absorbing materials are hot spots and difficulties in the research of ele...

Claims

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Application Information

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IPC IPC(8): C08L79/02C08K9/06C08K3/04C08K7/00C08K3/28C08K3/34
CPCC08K9/06C08K3/04C08K3/28C08K3/34C08K7/00C08K2201/001C08K2201/011
Inventor 雷春生薛培龙孟浩影
Owner 雷春生
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