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Microcrystal silver powder with nano-silver surface structure, and preparation method thereof

A surface structure, nano-silver technology, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems that restrict the uniformity, consistency and complexity of surface coating modification, and achieve simple The effect of process control, narrow particle size distribution and short production cycle

Active Publication Date: 2020-11-13
山东建邦胶体材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, pre-prepared micron powders and nanopowders need to meet specific powder properties, especially for the dispersion requirements of nanopowders, which may restrict the uniformity and consistency of surface coating modification; on the other hand, The modified equipment used usually requires a more complex system device

Method used

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  • Microcrystal silver powder with nano-silver surface structure, and preparation method thereof
  • Microcrystal silver powder with nano-silver surface structure, and preparation method thereof
  • Microcrystal silver powder with nano-silver surface structure, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Embodiment 1 preparation particle diameter is the microcrystalline silver powder 1# with nano-silver surface structure of 0.5 micron

[0044] (1) Dosing

[0045] Silver nitrate solution A: Dissolve 500g of silver nitrate in 2750g of deionized water and stir to dissolve, and add 25g of concentrated nitric acid to prepare silver nitrate solution A. Wherein, the concentration of silver nitrate solution is about 1.0mol / L, and the consumption of concentrated nitric acid is 0.05 times of silver nitrate mass.

[0046] Dispersant solution B: Dissolve 250g of dispersant K30 in 3300g of deionized water and stir to dissolve to obtain dispersant solution B. Wherein the amount of dispersant is 0.5 times of the mass of silver nitrate in silver nitrate solution A; the amount of deionized water in dispersant solution B is 1.2 times of the amount of deionized water in silver nitrate solution A.

[0047] Ascorbic acid solution C: Dissolve 360g of ascorbic acid in 2750g of deionized wat...

Embodiment 2

[0055] Embodiment 2 preparation particle diameter is the microcrystalline silver powder 2# with nano-silver surface structure of 1.0 micron

[0056] (1) Dosing

[0057] Silver nitrate solution A: Dissolve 750g of silver nitrate in 2750g of deionized water and stir to dissolve, and add 60g of concentrated nitric acid to prepare silver nitrate solution A. Wherein, the concentration of silver nitrate solution is about 1.5mol / L, and the consumption of concentrated nitric acid is 0.08 times of silver nitrate mass.

[0058] Dispersant solution B: Dissolve 300g of dispersant K30 in 3850g of deionized water and stir to dissolve to prepare dispersant solution B. Wherein the amount of dispersant is 0.4 times of silver nitrate quality in silver nitrate solution A; the amount of deionized water in dispersant solution B is 1.4 times of the amount of deionized water in silver nitrate solution A.

[0059] Ascorbic acid solution C: Dissolve 460g of ascorbic acid in 2750g of deionized water ...

Embodiment 3

[0067] Embodiment 3 preparation particle diameter is the microcrystalline silver powder 3# with nano-silver surface structure of 2.0 microns

[0068] (1) Dosing

[0069] Silver nitrate solution A: Dissolve 750g of silver nitrate in 2750g of deionized water and stir to dissolve, and add 60g of concentrated nitric acid to prepare silver nitrate solution A. Wherein, the concentration of silver nitrate solution is about 1.5mol / L, and the consumption of concentrated nitric acid is 0.08 times of silver nitrate mass.

[0070] Dispersant solution B: Dissolve 265g of dispersant K30 in 3300g of deionized water and stir to dissolve to prepare dispersant solution B. Wherein the amount of dispersant is 0.35 times of the mass of silver nitrate in silver nitrate solution A; the amount of deionized water in dispersant solution B is 1.2 times of the amount of deionized water in silver nitrate solution A.

[0071] Ascorbic acid solution C: Dissolve 425g of ascorbic acid in 2750g of deionized ...

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Abstract

The invention provides microcrystal silver powder with a nano-silver surface structure, and a preparation method thereof. The preparation method comprises the following steps: (1) obtaining a silver nitrate solution, a reducing agent solution and a dispersing agent solution through separate preparation; (2) adding 70-95% of the total mass of the silver nitrate solution and all the reducing agent solution into the dispersing agent solution at the same time under a stirring condition to prepare a silver powder suspension; (3) adjusting a pH value of the silver powder suspension, adding a surfaceactive agent for mixing, and then adding the left silver nitrate solution for stirring and a reaction; and (4) treating above reaction reagents with solid-liquid separation, washing and drying to obtain the microcrystal silver powder with the nano-silver surface structure. Through control of the reaction pH and an addition amount of the silver nitrate solution, compound modification of a nano surface of the microcrystal silver powder is realized, and the obtained microcrystal silver powder has a controllable particle diameter of 0.5-3.0 mu m and has a spherical or near-spherical uniform shape.

Description

technical field [0001] The invention relates to a preparation method of silver powder, in particular to a microcrystalline silver powder with a nano-silver surface structure and a preparation method thereof. Background technique [0002] Silver powder has excellent electrical and thermal conductivity, and is widely used in thick film conductive paste, high and low temperature conductive adhesive, electromagnetic shielding and other electronic paste fields. As a conductive filler, silver powder is an important part of electronic paste and a key material that determines the performance of the paste. Therefore, it is also the most widely used and the largest amount of precious metal powder material at present. [0003] In order to meet the ever-changing functional requirements of electronic and microelectronic devices, newer and higher performance requirements are also put forward for electronic paste and its silver powder. As a precious metal powder material, it is usually ne...

Claims

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Application Information

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IPC IPC(8): B22F9/24B22F1/00B82Y30/00B82Y40/00
CPCB22F9/24B82Y30/00B82Y40/00B22F1/07
Inventor 陈波王艳云许文艳马跃跃陈朋韩世生
Owner 山东建邦胶体材料有限公司
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