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Preparation of high dispersed superfine spherical silver powder for conductive silver slurry

A conductive silver paste, high-dispersion technology, applied in the field of preparation of highly dispersed ultra-fine spherical silver powder for conductive silver paste, can solve the problem of inability to obtain high-dispersion ultra-fine silver powder, difficulties in silver powder collection and secondary dispersion, and inability to achieve ultra-fine Problems such as powder interception, to achieve the effect of stable and reliable process conditions, high yield and low production cost

Inactive Publication Date: 2008-10-08
JINCHUAN GROUP LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] There are two key issues in the production of ultra-fine silver powder by chemical reduction: one is to simplify the process as much as possible, to make the operation easy, to control its physical properties, and to ensure the stability of the production process; Dispersion and other characteristics make it difficult to separate solids and liquids
It is basically impossible to intercept ultrafine powders <1μm by filtration; by centrifugal separation, for dispersion systems containing polymer surfactants, it is impossible to completely intercept ultrafine powders at low speeds (generally <3000rpm). Incomplete solid-liquid separation, resulting in low direct yield
However, at high rotational speed, the greater centrifugal force will cause the silver powder to agglomerate, destroy the shape of the silver powder, make it difficult to collect and disperse the silver powder, and cannot obtain highly dispersible ultra-fine silver powder.

Method used

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  • Preparation of high dispersed superfine spherical silver powder for conductive silver slurry
  • Preparation of high dispersed superfine spherical silver powder for conductive silver slurry
  • Preparation of high dispersed superfine spherical silver powder for conductive silver slurry

Examples

Experimental program
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Effect test

Embodiment 1

[0028] 1) Weigh 200g of analytically pure AgNO 3 Dissolve it in 3.6L of deionized water to prepare a silver nitrate solution; add 150-200ml of 25-28% ammonia water dropwise into the silver nitrate solution until the solution is just clear to obtain a silver-ammonia solution.

[0029] 2) Weigh 1.8g analytically pure NaOH and dissolve it in 12L deionized water to make solution A; weigh 18g PVA and dissolve it in 3L deionized water to make solution B; pour the prepared solutions A and B into the reaction kettle respectively , and measure 180mL of analytically pure formaldehyde into the reaction kettle, and stir for several minutes until the entire reduction system is a homogeneous phase.

[0030] 3) Add the silver ammonia solution dropwise to the reducing system, and control the adding rate to 100mL / min. After the silver ammonia solution is added dropwise, it is aged for 45 minutes to obtain a highly dispersed ultrafine silver powder slurry. The temperature of the whole reactio...

Embodiment 2

[0034] 1) Weigh 200g of analytically pure AgNO 3 Dissolve it in 3.6L of deionized water to prepare a silver nitrate solution; add 150-200ml of 25-28% ammonia water dropwise into the silver nitrate solution until the solution is just clear to obtain a silver-ammonia solution.

[0035] 2) Weigh 1.8g analytically pure NaOH and dissolve it in 12L deionized water to make solution A; weigh 18g PVA and dissolve it in 3L deionized water to make solution B; pour the prepared solutions A and B into the reaction kettle respectively , and measure 180mL of analytically pure formaldehyde into the reaction kettle, and stir for several minutes until the entire reduction system is a homogeneous phase.

[0036] 3) Add the silver ammonia solution dropwise to the reducing system, and control the adding rate to 100mL / min. After the silver ammonia solution is added dropwise, it is aged for 45 minutes to obtain a highly dispersed ultrafine silver powder slurry. The temperature of the whole reactio...

Embodiment 3

[0039] 1) Weigh 200g of analytically pure AgNO 3 Dissolve it in 3.6L of deionized water to prepare a silver nitrate solution; add 150-200ml of 25-28% ammonia water dropwise into the silver nitrate solution until the solution is just clear to obtain a silver-ammonia solution.

[0040] 2) Weigh 1.8g analytically pure NaOH and dissolve it in 12L deionized water to make solution A; weigh 18g PVA and dissolve it in 3L deionized water to make solution B; pour the prepared solutions A and B into the reaction kettle respectively , and measure 180mL of analytically pure formaldehyde into the reaction kettle, and stir for several minutes until the entire reduction system is a homogeneous phase.

[0041] 3) Add the silver ammonia solution dropwise to the reducing system, and control the adding rate to 100mL / min. After the silver ammonia solution is added dropwise, it is aged for 45 minutes to obtain a highly dispersed ultrafine silver powder slurry. The temperature of the whole reactio...

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Abstract

A preparation method of high-dispersion ultra-fine spherical silver powder used for conductive silver paste relates to a preparation method of ultra-fine spherical silver powder, in particular to the preparation method of the high-dispersion ultra-fine spherical silver powder for the conductive silver paste in the electronic industry. The preparation method is characterized in that silver ammonia solution is dropped in a reduction system which consists of a reducing agent of formaldehyde, a dispersant of polyvinyl alcohol PVA and sodium hydroxide solution, thus obtaining high-dispersion ultra-fine silver powder slurry, and the high-dispersion ultra-fine spherical silver powder with the particle size range of 0.3 to 1.0Mum can be obtained by solid-liquid separation and drying. The method of the invention has simple and feasible process flow, low production cost, less equipment investment, stable and reliable process conditions, small particle size of the product silver powder, narrow distribution range, high yield and easy realization of industrial mass production.

Description

technical field [0001] The invention relates to a preparation method of highly dispersed ultrafine spherical silver powder for conductive silver paste, relating to a preparation method of ultrafine spherical silver powder, in particular to a preparation method of highly dispersed ultrafine spherical silver powder for conductive silver paste in the electronic industry. Background technique [0002] Ultrafine silver powder has an irreplaceable position in the electronics industry due to its excellent electrical conductivity and excellent application performance. Silver electronic paste series products are the most widely used and the largest amount of precious metal paste in the electronics industry, and are the basic and key functional materials for the production of various electronic components. Because the silver electronic paste industry not only has high requirements on the chemical composition and impurity content of ultra-fine silver powder, but also its physical prope...

Claims

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Application Information

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IPC IPC(8): B22F9/24
Inventor 李永军武浚刘会基马骞潘应刚李玉杰王万麟肖建梅路维华
Owner JINCHUAN GROUP LIMITED
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