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Method for preparing metal nano-particle welded silver nano-wire electromagnetic shielding slurry

A metal nanoparticle and silver nanowire technology, applied in the field of nanomaterials, can solve the problems of high contact resistance and poor electromagnetic shielding performance, and achieve the effects of preventing electrical conductivity, reducing contact resistance, and easy adjustment of technical parameters.

Inactive Publication Date: 2018-11-09
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the pure silver nanowire network, there is a loose stacking structure between the wires, and there are fewer bonding sites between the wires, and the large contact resistance is also the main reason for the deterioration of its electromagnetic shielding performance.

Method used

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  • Method for preparing metal nano-particle welded silver nano-wire electromagnetic shielding slurry
  • Method for preparing metal nano-particle welded silver nano-wire electromagnetic shielding slurry
  • Method for preparing metal nano-particle welded silver nano-wire electromagnetic shielding slurry

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example 5

[0028] First, a dispersion of silver nanowires is mixed with metal nanoparticles. The silver nanowire solution can be obtained by mixing silver nanowires with a solvent, the diameter of the silver nanowires can be between 20-500 nm, and the aspect ratio is greater than 1000. Theoretically speaking, the smaller the diameter of the silver nanowires and the larger the aspect ratio, the higher the electrical conductivity of the prepared coating, and the greater the electromagnetic shielding effect. In addition, mixing methods include but are not limited to stirring, shaking, low-energy ultrasound, and the like. The solvent may be at least one of deionized water, ethanol, methanol, isopropanol, and DMF. The solid content of the silver nanowire solution may be 1%-30%, preferably 5-15%. The concentration of silver nanowires should not be too high or too low, and serious entanglement and coagulation will not occur, which will affect the uniformity of silver wire distribution during ...

Embodiment 1

[0035] A preparation method of silver nanowire composite metal nanoparticle electromagnetic shielding film:

[0036] Configure silver nanowire solution: mix silver nanowires with a diameter of 50nm (aspect ratio greater than 1000) with ethanol to obtain a silver nanowire solution with a solid content of 8%;

[0037] Add silver nanowires and iron nanoparticles (particle size is about 30 nm) to the solution of silver nanowires at a mass ratio of 1:1, mix and stir thoroughly, and add cysteamine accounting for 1% of the mass of silver nanowires as a soldering agent , kept at 70°C for 30 minutes to obtain soldered silver nanowires, and set aside;

[0038] (1) Mix the polyurethane solution and the soldered silver nanowires at a mass ratio of 1:2, and shake in an air bath constant temperature oscillator at 25°C (180 times / min) for 1 hour;

[0039] (2) Put the mixed polyurethane polymer solution of silver nanowires into a beaker, slowly pump out the air in the cavity with a vacuum pu...

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Abstract

The invention relates to a method for preparing a metal nano-particle welded silver nano-wire electromagnetic shielding slurry. The method comprises the following steps: adding metal nano-particles toa silver nano-wire solution, adhering the metal particles to the surface of silver nano-wires through the action of a soldering agent, mixing the obtained modified silver nano-wire solution with a polymer solution, adding a suitable proportion of a curing agent, and performing blending o obtain the silver nano-wire electromagnetic shielding slurry, wherein the silver nano-wires have a diameter of20-500 nm and a length-diameter ratio of above 1000; a solvent used in the invention is at least one of deionized water, ethanol, methanol, isopropanol and DMF, and the solid content of the silver nano-wire solution is 1-30%; the metal nano-particles have a diameter of 5-1000 nm; the metal nano-particles comprises at least one of iron nano-particles, cobalt nano-particles, nickel nano-particles,copper nano-particles and silver nano-particles, and oxide nanoparticles thereof; and the soldering agent includes at least one of cysteamine, cysteine and cystine.

Description

technical field [0001] The invention relates to a preparation method of silver nanowire composite metal nanoparticle electromagnetic shielding slurry, and relates to the technical field of nanomaterials. Background technique [0002] Electromagnetic shielding paste is a practical and effective electromagnetic shielding product that can replace traditional metal grids to prevent electromagnetic radiation pollution. In recent years, electromagnetic shielding products have gradually developed in the direction of light weight and flexibility, and now there is an urgent need for new electromagnetic shielding products in the market. With the development of society, electronic and electrical products are used more and more widely, which greatly facilitates people's daily life, but the resulting electromagnetic pollution, electromagnetic interference, leakage and other problems not only affect the normal operation of communication and other electronic equipment Work also has hidden...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/04C09D5/24
CPCC08K2003/0856C08K2201/011C09D5/24C09D175/04C08K7/06C08K3/08
Inventor 卢健高彦峰
Owner SHANGHAI UNIV
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