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Preparation method for flake silver powder

A flake silver powder, silver powder technology, applied in the directions of metal processing equipment, transportation and packaging, can solve the problems of the flake silver powder not being flat enough, and achieve the effect of smooth surface, concentrated distribution, and short placement time.

Active Publication Date: 2018-09-21
湖南省国银新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the tap density and specific surface area of ​​the flake silver powder prepared by this method are high, it can be seen from the SEM image that the edge of the flake silver powder obtained is thin, the middle is thick, and the flake silver powder is not smooth enough, which belongs to conventional flaky silver powder

Method used

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  • Preparation method for flake silver powder
  • Preparation method for flake silver powder
  • Preparation method for flake silver powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Weigh 5 kg of silver nitrate, dissolve it in 20 L of deionized water, prepare a silver nitrate solution with a mass concentration of 20% wt, and control the temperature at 15-16° C. in a water bath.

[0050] Weigh 2.7kg of ascorbic acid, dissolve it in 60L of deionized water, add 0.01kg of gum arabic and 0.05kg of polyvinylpyrrolidone, control the temperature of the solution at 15±1°C, stir for 30min, and adjust the pH of the solution to 1.2±0.1 by adding nitric acid.

[0051] Add the silver nitrate solution into the reducing agent solution at a constant flow rate of 60 L / min. After the addition is complete, continue stirring for 15 min to obtain a post-reaction solution.

[0052] The resulting reaction liquid was left to settle and settle until the layers were separated, then the supernatant liquid was removed, and the lower precipitate was repeatedly washed with deionized water until the conductivity was less than 20 μS / cm, filtered and dried to obtain a spherical silv...

Embodiment 2

[0055] Weigh 5 kg of silver nitrate, dissolve it in 15 L of deionized water, prepare a silver nitrate solution with a mass concentration of 25% wt, and control the temperature at 10-11° C. in a water bath.

[0056] Weigh 2.7kg of ascorbic acid, dissolve it in 70L of deionized water, add 0.02kg of gelatin and 0.02kg of polyethylene glycol, control the temperature of the solution at 10-11°C, stir for 30min, and adjust the pH of the solution to 1.5±0.1 by adding nitric acid.

[0057] Add the silver nitrate solution into the reducing agent solution at a constant flow rate of 60 L / min. After the addition is complete, continue stirring for 15 min to obtain a post-reaction solution.

[0058] The resulting reaction liquid was left to settle and settle until the layers were separated, then the supernatant liquid was removed, and the lower precipitate was repeatedly washed with deionized water until the conductivity was less than 20 μS / cm, filtered and dried to obtain a spherical silver ...

Embodiment 3

[0061] Weigh 5 kg of silver nitrate, dissolve it in 12 L of deionized water, and prepare a silver nitrate solution with a mass concentration of 29.4% wt, and control the temperature at 18-20° C. in a water bath.

[0062] Weigh 3.0kg of ascorbic acid, dissolve it in 55L of deionized water, add 0.08kg of polyvinylpyrrolidone, control the temperature of the solution at 18-20°C, stir for 30min, and adjust the pH of the solution to 1.5±0.1 by adding nitric acid.

[0063] Add the silver nitrate solution into the reducing agent solution at a constant flow rate of 40 L / min. After the addition is complete, continue stirring for 15 min to obtain a post-reaction solution.

[0064] The resulting reaction liquid was left to settle and settle until the layers were separated, then the supernatant liquid was removed, and the lower precipitate was repeatedly washed with deionized water until the conductivity was less than 20 μS / cm, filtered and dried to obtain a spherical silver powder with a w...

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Abstract

The invention provides a preparation method for flake silver powder. The preparation method comprises the following steps of mixing silver nitrate solutions and reductant solutions with the pH value of 1.0-2.0 under the condition of 10-20 DEG C water bath at the dropping speed of 40-60 L / min, and continuing reacting to obtain reaction solutions; standing and settling, removing supernatant liquor,cleaning lower precipitates with water till the conductivity is 20 <mu>S / cm, and obtaining spherical silver powder after pumping filtration and drying; adding the spherical silver powder into ball mill equipment, separately adding zirconia balls, oleic acid, or stearic acids and ethyl alcohol for ball milling, and then separating the zirconia balls; and filtering, drying and screening the mixturesto obtain dried flake silver powder. The preparation method is simple, and the preparation period is short; the average particle size of the obtained flake silver powder is 4-6 <mu>m, and the distribution is concentrated; and the thickness and shape are uniform, and the surface is flat.

Description

technical field [0001] The invention belongs to the technical field of metal powder preparation, and in particular relates to a preparation method of flake silver powder. Background technique [0002] Conductive silver paste is one of the most important materials in the electronics industry. It uses high-purity (>99.5%) silver powder to make various conductive pastes, which are widely used in the coating of printed circuits and the bonding of electronic devices. Low-temperature silver paste generally refers to the silver paste whose curing temperature is lower than 200°C during the application process. With the change of the application substrate and the control of production costs, most low-temperature silver pastes are required to have a curing temperature lower than 150°C. In order to balance the electrical properties and cost factors of the silver paste, the resin ratio and silver content of the low-temperature silver paste are decreasing, the amount of organic solven...

Claims

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Application Information

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IPC IPC(8): B22F9/24B22F9/04B22F1/00
CPCB22F9/04B22F9/24B22F2009/043B22F1/068
Inventor 李文焕杨华荣严红革刘飞全杨根
Owner 湖南省国银新材料有限公司
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