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Preparation method as well as application of novel electromagnetic shielding filler

A new type of electromagnetic shielding technology, applied in the field of preparation of new electromagnetic shielding fillers, can solve the problems that hollow silver microspheres are not suitable for functional composite materials, a large number of hollow silver microspheres are prepared, and the shell structure is incomplete, etc., to achieve weight reduction, The effect of low price and cost reduction

Inactive Publication Date: 2010-05-26
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods have problems such as incomplete shell structure and shell structure is destroyed when the template is removed, and the hollow silver microspheres prepared by these methods are not suitable for use in functional composite materials, because the template particles used must be synthesized by themselves. Or buy at a high price, resulting in the technical bottleneck of preparing a large number of hollow silver microspheres
[0004] So far, the research on the performance of hollow noble metal particles has mainly focused on photonic crystals, catalysis, surface-enhanced Raman scattering, biochemical sensors, antibacterial materials, etc. There is no research on the application of hollow silver microspheres in composite functional materials. Literature reports on performance and EMI shielding performance

Method used

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  • Preparation method as well as application of novel electromagnetic shielding filler
  • Preparation method as well as application of novel electromagnetic shielding filler
  • Preparation method as well as application of novel electromagnetic shielding filler

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Embodiment 1

[0033] Embodiment 1, the preparation of hollow silver microspheres:

[0034]Prepare 1500 milliliters of 1% sodium hydroxide solution, add about 150 grams of glass microspheres, and stir for 15 minutes. Suction filtration, washing with water for 3 times until the pH value is 7, drying for later use. Take 2 liters of absolute ethanol, add 40 ml of γ-amino-propyltrimethoxysilane, stir until uniform, and reflux at 60 degrees Celsius for 6 hours. Wash the surface-modified glass microspheres 3 times, and filter each time until the filtrate does not produce foam, and dry it under vacuum at 60 degrees Celsius for use. Prepare reducing solution, get reducing agent formaldehyde solution 65 milliliters (commercially available, direct use) and deionized water 4000 milliliters, mix uniformly to form a solution, then add 20 grams of polyvinylpyrrolidone (PVP), and finally add 150 grams of surface-modified Glass microspheres, stirred evenly to prepare a reduction mixture. In addition, pre...

Embodiment 2

[0035] Embodiment 2, the preparation of hollow silver microspheres:

[0036] Prepare 1500 milliliters of 5% sodium hydroxide solution, add about 150 grams of glass microspheres, and stir for 15 minutes. Suction filtration, washing with water for 3 times, as long as the pH value is 7, and drying for later use. Take 2 liters of absolute ethanol, add 200 ml of γ-amino-propyltrimethoxysilane, stir until uniform, and reflux at 60 degrees Celsius for 6 hours. Wash the surface-modified glass microspheres 3 times, and filter each time until the filtrate does not produce foam, and dry it under vacuum at 60 degrees Celsius for use. Prepare reducing solution, get 160 grams of glucose, 16 grams of sodium potassium tartrate and 4000 milliliters of deionized water, mix uniformly to form a solution, then add 80 grams of polyvinylpyrrolidone (PVP), and then add 180 grams of surface-modified glass beads, Stir evenly to prepare a reduction mixture. In addition, prepare silver nitrate solutio...

Embodiment 3

[0037] Embodiment 3, the preparation of hollow silver microspheres:

[0038] Prepare 1500 milliliters of 5% sodium hydroxide solution, add about 150 grams of glass microspheres, and stir for 15 minutes. Suction filtration, washing with water for 3 times until the pH value is 7, drying for later use. Take 2 liters of absolute ethanol, add 100 ml of γ-amino-propyltrimethoxysilane, stir until uniform, and reflux at 60 degrees Celsius for 6 hours. Wash the surface-modified glass microspheres 3 times, and filter each time until the filtrate does not produce foam, and dry it under vacuum at 60 degrees Celsius for use. Prepare reducing solution, get 300 grams of glucose, 20 grams of sodium potassium tartrate and 4000 milliliters of deionized water, mix uniformly to form a solution, then add 160 grams of polyvinylpyrrolidone (PVP), and then add 140 grams of surface-modified glass beads, Stir evenly to prepare a reduction mixture. In addition, prepare silver nitrate solution, add am...

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Abstract

The invention relates to a preparation method as well as an application of novel electromagnetic shielding filler. The preparation method of the novel electromagnetic shielding filler comprises the following steps: by using clean glass microspheres as templates, firstly carrying out sulfhydrylation or amination modification on the surfaces of the templates; then enabling silver nanoparticles to directionally deposit and gradually grow on the surfaces of the templates continuously by using a chemical silvering method to obtain silver-coated glass microsphere compound particles with complete nuclear shell structures; and then, dissolving the templates with a hydrofluoric acid solution, and filtering in a pumping way, washing and drying to obtain hollow silver microspheres with complete structures to be used as the electromagnetic shielding filler. The novel electromagnetic shielding filler prepared by the invention has good conductivity; compared with the traditional conducting aluminum powder, the cost of the novel electromagnetic shielding filler is at least lowered by 65%, and the weight of the novel electromagnetic shielding filler is reduced by more than 80%; the electromagnetic shielding composite material prepared by the novel electromagnetic shielding filler has better shielding effectiveness; and the novel electromagnetic shielding filler has wide application prospects in the aspects of electromagnetic compatibility engineering, information leakage prevention, electromagnetic interference application and the like.

Description

technical field [0001] The invention belongs to the field of metal inorganic materials, and in particular relates to a preparation method and application of a novel electromagnetic shielding filler. Background technique [0002] With the rapid development of today's electronics industry, the electronic circuits and components on electrical and electronic products are highly integrated, miniaturized and digitized, resulting in a large number of negative effects, such as: electromagnetic information leakage and electromagnetic radiation pollution. Electromagnetic shielding (Shielding) technology is an effective measure to improve the electromagnetic compatibility level of electrical and electronic equipment. Electromagnetic shielding materials are the material basis for realizing electromagnetic shielding technology. In the application and research of electromagnetic shielding materials, traditional conductive fillers are generally powder materials with high conductivity or h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/16
Inventor 官建国王一龙章桥新邵寒梅张清杰
Owner WUHAN UNIV OF TECH
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