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Preparation method of spheroidal silver powder

A silver powder and spherical technology, which is applied in the field of preparation of quasi-spherical silver powder, can solve the problems of continuity and uniformity of tension and instability, and achieve the effects of improving fluidity and filling performance, wide controllable range and wide window.

Inactive Publication Date: 2020-01-10
苏州银瑞光电材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing domestic silver powder usually adopts the method of doping powder with large and small particle sizes to balance the overall performance of the silver powder. However, there is instability in the continuity of printing and the uniformity of pulling force.

Method used

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  • Preparation method of spheroidal silver powder
  • Preparation method of spheroidal silver powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0068] A preparation method of spherical silver powder includes the following steps:

[0069] Step 1: Solution preparation, prepare silver nitrate solution A, reducing agent solution B, regulator solution C and dispersant solution D respectively;

[0070] Step 2: Reduction reaction

[0071] Under high-speed stirring, add a quantitative regulator solution C to the reducing agent solution B, and then quickly add the silver nitrate solution A to the reducing agent solution B at a certain flow rate through a flowmeter. In the silver nitrate solution A and the regulator solution C Before or after the addition, quickly add the dispersant solution D to the reducing agent solution B, adjust the temperature after the addition, and continue to stir and react for 15-30 minutes;

[0072] Step 3: Chemical modification of silver powder

[0073] After the above step 2 reduction reaction is completed, the supernatant after the reaction is removed by sedimentation, and the remaining part is transferred...

Embodiment 1

[0085] A preparation method of spherical silver powder includes the following steps:

[0086] Step 1: Solution preparation

[0087] Preparation of silver nitrate solution

[0088] Dissolve 10kg of silver nitrate in 40L of deionized water and control the temperature to 32.0~35.0℃ to prepare silver nitrate solution A;

[0089] Preparation of reducing agent solution

[0090] Dissolve 6.4kg of ascorbic acid in 220L of deionized water and control the temperature to 32.0~35.0℃ to prepare reducing agent solution B;

[0091] Preparation of conditioner solution

[0092] Prepare 2 kg of nitric acid with a mass concentration of 10% to prepare regulator solution C;

[0093] Preparation of dispersant solution

[0094] Dissolve 50g of gelatin in 2L of deionized water and control the temperature to 50-60°C to prepare dispersant solution D;

[0095] Step 2: Reduction reaction

[0096] Under high-speed stirring, quickly add the conditioner solution C to the reducing agent solution B, and then add the silver n...

Embodiment 2

[0105] A preparation method of spherical silver powder includes the following steps:

[0106] Step 1: Solution preparation

[0107] Preparation of silver nitrate solution

[0108] Dissolve 10kg of silver nitrate in 30L of deionized water and control the temperature to 41.0~43.0℃ to prepare silver nitrate solution A;

[0109] Preparation of reducing agent solution

[0110] Dissolve 4.5kg of ascorbic acid and 1.5kg of glucose in 200L of deionized water and control the temperature to 41.0~43.0℃ to prepare reducing agent solution B;

[0111] Preparation of conditioner solution

[0112] Prepare 3 kg of ammonia water with a mass concentration of 8% to prepare regulator solution C;

[0113] Preparation of dispersant solution

[0114] Dissolve 30g of gelatin in 2L of deionized water and control the temperature at 50-52°C to prepare dispersant solution D1. Dissolve 30g of polyvinyl alcohol in 2L of deionized water and control the temperature at 50-52°C to prepare dispersant solution D2;

[0115] Step...

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Abstract

The invention relates to a preparation method of spheroidal silver powder. The method comprises the following steps: step 1, preparing a solution; step 2, performing reduction reaction; step 3, chemically modifying silver powder; step 4, performing silver powder surface treatment; and step 5, sieving and testing the silver powder. The silver powder prepared by the method has an average particle diameter D50 of 1.4-1.8 microns and a tap density of 6.0-6.5 g / cm3, and the spheroidal silver powder with holes inside can give consideration to filling performance and sintering activity.

Description

Technical field [0001] The invention belongs to the field of silver powder preparation, and in particular relates to a method for preparing spherical silver powder. Background technique [0002] In the photovoltaic metallized silver paste, the front electrode silver paste requires silver powder to provide a high bulk density, and can obtain a large aspect ratio during screen printing. At the same time, with the improvement of supporting materials and the reduction of energy consumption, and With the improvement of electrical performance, the sintering temperature continues to decrease, requiring silver powder to be sintered at a lower temperature, as well as the special requirements of some other manufacturers when matching. These requirements are reflected in indicators that require silver powder to have a higher tap density, filling performance, and higher sintering activity. The existing domestic silver powder usually adopts the method of doping with small and small particle ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B22F1/00
CPCB22F9/24B22F2009/245B22F1/14B22F1/145
Inventor 李文焕王亚平李利潮潘炼
Owner 苏州银瑞光电材料科技有限公司
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