Method for preparing silver powder in continuous mode

A continuous method, silver powder technology, applied in the field of silver powder with uniform particle size, can solve the problems of ubiquitous intermittent reaction, numerous production processes, unstable quality, etc., to achieve good dispersibility, uniform particle size and adjustable particle size. Effect

Inactive Publication Date: 2014-03-12
ZHEJIANG GUANGDA ELECTRONICS TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The method described above can produce silver powder particles that meet the needs of conductive silver paste, but there are problems that intermittent reactions exist everywhere, such as limited single-batch output, unstable quality when enlarging and expanding production, and numerous production processes.

Method used

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  • Method for preparing silver powder in continuous mode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Silver solution preparation: dissolve 17KgAgNO3 and 1Kg Tween 60 in 100L deionized water, stir to dissolve, and keep the temperature at 40°C; preparation of reducing solution: dissolve 6L (50%) hydrazine hydrate and 50g sodium hydroxide in 100L deionized water Water, constant temperature at 40°C; pump the silver solution and reducing solution into the reaction at a flow rate of 200L / H, pump the suspension into the solid-liquid separation equipment for filtration after the reaction, and wash the silver powder after solid-liquid separation with deionized water until the conductivity is less than 200μs / cm, the filter cake was dried at 30°C, crushed and sieved to obtain silver powder, see figure 1 .

Embodiment 2

[0028] Preparation of silver solution: Dissolve 17KgAgNO3, 20L ammonia water, and 3KgPVA in deionized water, stir to dissolve, prepare a 200L solution, and keep the temperature at 40°C. Preparation of reducing solution: Dissolve 10KG of hydrazine hydrate in deionized water and adjust the preparation to 100L. The temperature is kept at 40°C; the silver solution and the reducing solution are pumped into the reactor at a flow rate of 200L / H and 100L / H respectively, and the silver powder suspension is separated from the solid and liquid after the reaction. Wash with deionized water until the conductivity is less than 200μs / cm, dry the filter cake at 50°C, crush and sieve to obtain silver powder, see figure 1 .

Embodiment 3

[0030] Preparation of silver solution: dissolve 17KgAgNO3 and 1KgPVP in 300L deionized water, stir to dissolve, and keep the temperature at 30°C; preparation of reducing solution: dissolve 17KG ascorbic acid in 100L of deionized water, keep the temperature at 30°C; The flow rate of 600L / H and 200L / H is pumped into the pipeline reactor, the silver powder after solid-liquid separation is washed with deionized water until the conductivity is less than 200μs / cm, the filter cake is dried at 60°C, crushed and sieved to obtain silver powder, powder For detection performance, see figure 1 .

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Abstract

A method for preparing silver powder in a continuous mode is characterized by comprising the following steps that (a) a silver solution is prepared, namely silver nitrate, pH adjusting agents, complexing agents and dispersing agents are dissolved in deionized water to form a water solution with the silver ion concentration of 0.3-3.0 mol / L; (b) reducing agents and pH adjusting agents are dissolved in deionized water to form a reducing solution; (c) a and b liquid reaction temperature, the pH value, flow and an injection included angle are adjusted, and meanwhile liquid flows into a pipeline reactor for mixing reaction; and (d) discharging silver powder suspension liquid passes through solid-liquid separating equipment, silver powder is filtered and separated, deionized water is used for washing, 30-60 DEG C drying is carried out, screening is carried out, and ultra-thin silver powder is obtained. Silver powder products prepared with the method are stable in performance, high in dispersity, even in particle size distribution and capable of meeting the application requirements of various electronic pastes.

Description

Technical field: [0001] The invention relates to a method for silver powder with uniform particle size, in particular to a method for preparing silver powder by a continuous method Background technique: [0002] As a conventional conductive paste for electronic components, such as internal electrodes of multilayer capacitors, printed circuits of circuit boards, solar cell electrodes, and electrodes of plasma display panel (PDP) substrates, it is usually made by mixing silver powder, glass Powder and inorganic additives, etc., are made by stirring, grinding and rolling, among which silver powder accounts for the highest mass fraction, and the quality of silver powder greatly affects the performance of the final slurry. As the size of these electronic components decreases, silver powders for conductive pastes are required to have reasonably small particle sizes and reasonably narrow particle size ranges to form printed circuits with high density and fine solid lines. [0003]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24
Inventor 柴良唐元勋奉向东
Owner ZHEJIANG GUANGDA ELECTRONICS TECH
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