Novel multi-element structure composite conductive filling material

A technology of composite conductive and conductive materials, applied in other chemical processes, chemical instruments and methods, etc., can solve the problems of reduced conductivity, poor shielding effect, poor high temperature characteristics, etc.

Inactive Publication Date: 2016-01-27
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, shielding fillers mainly include: (1) Metal conductive fillers: mainly metal conductive fillers such as silver, copper, and nickel; silver, copper, and other metals have high conductivity and good electromagnetic shielding effect, but Ag is expensive; in addition, Cu is easy to oxidize and reduce Conductivity, so special anti-oxidation treatment must be carried out; although nickel has certain magnetic properties and good chemical stability, its conductivity is lower than Cu and Ag, so the shielding effect is not as good as the former
(2) Metal wave-absorbing fillers: Commonly used metal wave-absorbing fillers include ferroferric oxide, magnetic metal powder (carbonyl iron powder, iron-cobalt-nickel and their alloys), polycrystalline iron fibers, etc., but such metal wave-absorbing fillers are also There are disadvantages such as high density and poor high temperature characteristics
[0005] Combining reflection loss and absorption loss is one of the key directions in the research of electromagnetic shielding materials, such as: using multi-layer composite / multi-filler composite technology to endow electromagnetic shielding composite materials with conductive and magnetic properties, thereby improving the electromagnetic shielding of materials efficiency, but at the same time, the thickness of the material increases and the processing technology is complicated.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] A layer of ferric oxide is plated on the surface of hollow glass microspheres by co-precipitation method, and then a layer of silver is plated on the surface by electroless plating to prepare a multi-component composite conductor filler-hollow glass microspheres / ferric oxide / silver , wherein the mass percentages of hollow glass microspheres, ferroferric oxide and silver are 35%, 35% and 30% respectively, and each raw material is calculated and weighed according to the ratio of the corresponding mass ratios. Mix ferric nitrate and ferrous chloride solutions of the same concentration in a ratio of 3:2, add the washed and roughened hollow glass microspheres, add the precipitant NaOH solution dropwise, react for 15 minutes, and then filter , washing and drying to obtain hollow glass microsphere / ferric oxide composite powder. Prepare a silver ammonia solution with a concentration of 0.05mol / L, add hollow glass microspheres / ferric oxide composite powder, stir, heat to 45°C, a...

Embodiment 2

[0016] A layer of ferric oxide is plated on the surface of carbon fiber by hydrothermal method, and then a layer of silver is plated on the surface by chemical plating to prepare a multi-component composite conductor filler-carbon fiber / ferric oxide / silver, wherein carbon fiber, ferric oxide The mass percentages of the three irons and the silver are respectively 40%, 35% and 25%, and each raw material is calculated and weighed according to the ratio of the corresponding mass ratios. Mix ferric nitrate and ferrous chloride solutions of the same concentration in a ratio of 5:3, add urea, and stir to obtain a transparent solution, then place the solution in a high-pressure reactor, add carbon fiber, and add an appropriate amount of Water, make the filling degree 0.65, seal the reaction kettle, pass in nitrogen gas (as a protective gas), stir at high speed, heat the solution in the reaction kettle to 140°C, maintain the atmospheric pressure at 6-7 atmospheric pressure, react for 2 ...

Embodiment 3

[0018] A layer of barium ferrite (BaFe) was coated on the surface of glass fiber by sol-gel method 12 o 19 ), and then adopt electroless plating to plate a layer of silver on its surface to prepare multiple structure composite conductor filler-glass fiber / barium ferrite / silver, wherein the mass percentages of glass fiber, barium ferrite and silver are respectively 40%, 40% and 20%, calculate and weigh each raw material according to the ratio of the corresponding mass ratio. Mix barium nitrate, ferric nitrate and citric acid in a molar ratio of 1:12:13, add distilled water and stir for 20 minutes to dissolve completely, add ammonia water dropwise to adjust the pH value to 7, make the solution into a transparent sol, and heat at 75°C Put the water bath at constant temperature for 2 hours, then place the cleaned and roughened glass fibers in the sol solution, and under stirring, make the sol coat the surface of the glass fibers; then place them in an oven and dry at 120°C for 20...

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PUM

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Abstract

The invention discloses a multi-element structure composite conductive filling material. A surface of lightweight inorganic powder (hollow glass beads, mica, carbon fibers, flake graphite and the like) is plated with a layer of wave absorbing magnetic material (Ni, Fe, Co, Ni-P, Co-P, Ni-Co-P, Co-W-P, barium ferrite, ferriferrous oxide, carbonyl iron and the like), and then is plated with a layer of conductive material (such as metal of silver, nickel, copper and the like or inorganic oxides of doped tin oxide, doped indium oxide, doped zinc oxide, titanium dioxide and the like), and a novel multi-element structure composite conductive filling material-inorganic powder core/magnetic material coating layer/conductive material coating layer is prepared. The electromagnetic shielding performance of the composite conductive filling materials can be raised further by utilization of wave absorbing performances of the wave absorbing material to electromagnetic waves and the reflection performances of the conductive material to electromagnetic waves. The composite conductive filling material has advantages of light weight, low cost, wide shield frequency band, good shielding properties and the like, and has great application values in the electromagnetic shielding composite material field.

Description

technical field [0001] The invention belongs to the field of functional materials and relates to a multi-component composite conductive filler. A layer of wave-absorbing magnetic material is plated on the surface of the inorganic powder, and then a layer of conductive material is plated to obtain a new type of multi-structure composite conductive filler-inorganic powder core / magnetic material coating / conductive material coating, which has light weight, It has the advantages of low cost, wide shielding frequency band, and good shielding performance, and can be used in the field of electromagnetic shielding composite materials. Background technique [0002] With the rapid development of science and technology such as radar, microwave communication, and electronic countermeasures, the problem of electromagnetic interference (EMI) is becoming more and more serious. In order to achieve electromagnetic wave protection, electromagnetic shielding materials are developing rapidly, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K3/00
Inventor 曹晓国张海燕
Owner GUANGDONG UNIV OF TECH
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