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Preparation method of composite reducing agent liquid phase for conductive composite particles coated with silver shell layers

A surface coating, composite particle technology, applied in coating, liquid chemical plating, metal material coating process and other directions, can solve the problems of shell continuity, low density, complex process, large amount of silver, etc. To achieve the effect of easy mass production, simple raw material composition and low silver content

Inactive Publication Date: 2013-10-09
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a liquid-phase preparation method of a composite reducing agent for the surface-coated silver-shell conductive composite particles, which solves the problem of the existing preparation of GMAg or SiO 2 The continuity and density of the shell of Ag composite particles is not high, the amount of silver is large, the cost is high, or the process is complicated.

Method used

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  • Preparation method of composite reducing agent liquid phase for conductive composite particles coated with silver shell layers
  • Preparation method of composite reducing agent liquid phase for conductive composite particles coated with silver shell layers
  • Preparation method of composite reducing agent liquid phase for conductive composite particles coated with silver shell layers

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Add 20g of glass beads (D25μm) to 200mL of deionized water, stir, leave for 30 minutes, discard the supernatant, and wash repeatedly until the supernatant has no floating matter and the sedimentation liquid is clear, add 1% sodium hydroxide aqueous solution for further processing Degreasing and cleaning, and then washing with water until the pH of the sedimentation liquid is 7; suction filtration, drying at 60°C for later use. Take 400mL of absolute ethanol, add 28mL of γ-mercapto-propyltrimethoxysilane, stir until uniform, add 20g of cleaned glass beads, reflux at 80℃ for 6 hours; filter, dry at 60℃ to obtain the surface after chemical modification Glass beads, set aside.

[0025] Prepare a weak reducing agent solution, take 22.5g glucose, 2g potassium sodium tartrate and 500mL deionized water, boil for 5 minutes, and cool to room temperature for later use (glucose concentration is 0.25mol / L, potassium sodium tartrate concentration is 0.14mol / L); Take 20mL of the reducin...

Embodiment 2

[0029] The cleaning and sulfhydryl modification steps of the glass beads are the same as in Example 1.

[0030] Prepare weak reducing agent solution, take 12.9g sodium citrate dissolved in 100ml deionized water for later use (sodium citrate concentration is 0.5mol / L); take 40ml reducing solution, then add 0.5g polyvinylpyrrolidone (PVP), add 4.8 g Glass beads with chemical modification on the surface (the mass volume concentration of the glass beads is 120g / L), stir evenly to form a reduction mixture. Another 25mL silver salt solution, in which silver nitrate concentration is 0.4mol / L, ammonia concentration is 3mol / L, sodium hydroxide concentration is 0.5mol / L; another 5×10 -4 mol / L hydrazine hydrate solution 5mL; finally the above silver salt solution and hydrazine hydrate solution were dropped into the reduction mixture at a dropping rate of 1.5ml / min, and reacted at 25°C for 90min. Filter by suction, wash 5 times with deionized water, dry completely in a vacuum drying oven, an...

Embodiment 3

[0033] The cleaning and sulfhydryl modification steps of the glass beads are the same as in Example 1.

[0034] Prepare a weak reducing agent solution, take 4.5g glucose, 0.5g sodium potassium tartrate, 2.58g sodium citrate, 100mL deionized water, 10ml absolute ethanol, boil for 5 minutes, cool to room temperature and set aside (glucose concentration is 0.25mol / L, The concentration of potassium and sodium tartrate is 0.018mol / L, and the concentration of sodium citrate is 0.1mol / L); take 20mL of reducing solution, then add 0.5g of polyvinylpyrrolidone (PVP), and add 4g of chemically modified glass beads (glass microspheres). The mass volume concentration of the beads is 200g / L), stir evenly to form a reduction mixture. It is also equipped with 20mL silver salt solution, in which the concentration of silver nitrate is 0.1mol / L, the concentration of ammonia is 0.75mol / L, and the concentration of sodium hydroxide is 0.125mol / L; it is also equipped with a strong reducing agent mixed w...

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Abstract

The invention relates to a preparation method of a composite reducing agent liquid phase for conductive composite particles coated with silver shell layers. According to the preparation method, a composite reducing agent solution constituted by a strong reducing agent and a weak reducing agent is adopted for reducing a silver salt solution to prepare the conductive composite particles coated with the silver shell layers in the presence of glass microspheres (GM) or SiO2 kernel particles subjected to surface chemical modification. The preparation method disclosed by the invention has the main advantages that the silver shell layers are dense and thin, the silver content is low, and the cost is low; the preparation method is easy to realize large-scale production. The preparation method disclosed by the invention has the advantages of simple preparation process, simple raw material composition, short preparation period and convenience in popularization and application.

Description

Technical field [0001] The invention relates to the field of electromagnetic shielding conductive fillers, in particular to a liquid phase preparation method of a composite reducing agent coated with conductive composite particles of a silver shell layer. Background technique [0002] With the rapid development of science and technology and the electronic information industry, electromagnetic radiation pollution has become a major public hazard in today's society. In order to reduce the harm caused by electromagnetic radiation, research and development of new electromagnetic shielding composite materials is very important. Compared with the traditional conductive silver powder, in glass beads (GM) or SiO 2 The composite particles coated with the silver shell layer on the particle surface have the characteristics of light weight, regular shape, not easy to settle in the polymer matrix, easy to disperse and low cost, and have been widely used as conductive fillers in polymer-based ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24C23C18/44
Inventor 赵素玲孙洁王一龙官建国
Owner WUHAN UNIV OF TECH
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