Preparation method for flake silver powder for electronic paste

A technology of flaky silver powder and electronic paste, which is applied in the field of preparation of flaky silver powder for electronic paste, can solve the problems of high tap density, fast reaction speed, and poor sphericity of silver powder, and achieve large coating area, The effect of less filling amount and lower bulk density

Inactive Publication Date: 2015-01-28
KUNMING SHUYANG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the preparation process of this kind of method, there will be the following problems: using ammonia as a complexing agent is relatively unstable, and the pH value needs to be adjusted frequently; secondly, formalin is used as a reducing agent, and the reaction speed is fast, and the obtained particles are not uniform.
However, the silver powder prepared by this process has a large tap density, a small specific surface area, poor sphericity, and uneven particle size.

Method used

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  • Preparation method for flake silver powder for electronic paste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] a, the preparation of silver powder: take the silver nitrate solution that mass percentage concentration is 25%, add the ascorbic acid solution that mass percentage concentration is 15% to react, when adding ascorbic acid solution, add slowly while stirring, and the time of adding is 15 minutes After the addition is completed, react at 20°C for 15 minutes, then filter to obtain spherical silver powder with uniform particle size; the weight ratio of the silver nitrate solution to the ascorbic acid solution is 1:1.25;

[0026] B, ball milling: according to the weight ratio of ball and spherical silver powder is the ratio of 30:1, described spherical silver powder is placed in ball mill, and ball adopts the ball that single diameter is 10mm to carry out; Then according to the amount of every kilogram of spherical silver powder, respectively Add 1L of ball milling medium, 20g of ball milling aid and 20mL of lubricant for ball milling, the time of ball milling is 6 hours, the...

Embodiment 2

[0032] a, the preparation of silver powder: take the silver nitrate solution that mass percentage concentration is 20%, add the ascorbic acid solution that mass percentage concentration is 20% to react, when adding ascorbic acid solution, add slowly while stirring, and the time of adding is 10 minutes , react under the condition of 25 ℃ for 20 minutes after the addition is completed, then filter to obtain spherical silver powder with uniform particle size; the weight ratio of the silver nitrate solution to the ascorbic acid solution is 1:1;

[0033] B, ball mill: according to the weight ratio of ball and spherical silver powder is the ratio of 10:1, described spherical silver powder is placed in the ball mill, and ball adopts the ball that single diameter is 20mm to carry out; Then press the amount of every kilogram of spherical silver powder, respectively Add 0.5L of ball milling medium, 30g of ball milling aid and 4mL of lubricant to carry out ball milling, the time of ball m...

Embodiment 3

[0039] a, the preparation of silver powder: take the silver nitrate solution that mass percentage concentration is 25%, add the ascorbic acid solution that mass percentage concentration is 20% to react, when adding ascorbic acid solution, add slowly while stirring, and the time of adding is 12 minutes After the addition is completed, react at 15°C for 10 minutes, then filter to obtain spherical silver powder with uniform particle size; the weight ratio of the silver nitrate solution to the ascorbic acid solution is 1:1.5;

[0040]B, ball milling: according to the weight ratio of ball and spherical silver powder is the ratio of 50:1, described spherical silver powder is placed in the ball mill, and the ball adopts the ball that single diameter is 4mm to carry out; Then according to the amount of every kilogram of spherical silver powder, respectively Add 2L of ball milling medium, 5g of ball milling aid and 40mL of lubricant for ball milling, the time of ball milling is 8 hours,...

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Abstract

The invention relates to a preparation method for flake silver powder for electronic paste, and belongs to the field of preparation of metal powder materials. The method comprises the following steps of (a) preparation of silver powder, (b) ball-milling, (c) primary surface modification and (d) secondary surface modification. The preparation method has the advantages that the flake silver powder is low in apparent density, large in specific surface area, high in dispersibility, large in coating area and low in filling amount; and the cost is greatly saved.

Description

technical field [0001] The invention belongs to the field of preparation of metal powder materials, and in particular relates to a method for preparing flake silver powder for electronic paste. Background technique [0002] Flake silver powder is widely used in electronic components, integrated circuits, touch screens, solar cells, display devices, radio frequency identification, electronic tags and other fields. The best conductive fillers for electronic products such as plastics, used in the electronics industry, can be divided into two aspects: microelectronics (low power, low voltage) and electrical (high power, high voltage). With the development trend of light, small and thin civilian electrical appliances, the use of microelectronics will become the most important aspect. The application form of silver in the microelectronics industry is thin layer, which is derived from the requirements of light, small, thin and cost of electronic machines. The current main technolo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B22F1/00
Inventor 王敏王坤仑肖雨
Owner KUNMING SHUYANG TECH
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