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Preparation and surface modification method of spherical silver powder suitable for electronic silver paste

A surface modification, silver paste technology, applied in metal processing equipment, transportation and packaging, etc., can solve the problems of poor printing performance, poor wettability of organic solvents, unevenness, etc., to achieve improved requirements and the effect of particle size optimization

Pending Publication Date: 2022-07-01
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

There is still a surface where gas competes with organic solvents in the pores of the particles, and the surface has poor wettability to organic solvents, making the entire silver paste system in an uneven state. With high content of silver paste, particle aggregates are easy to interlock with each other, increasing the flow resistance, leading to poor printing performance

Method used

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  • Preparation and surface modification method of spherical silver powder suitable for electronic silver paste

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Embodiment

[0023] A method for the preparation and surface modification of spherical silver powder suitable for electronic silver paste. First, the silver source solution containing silver ions is reduced to obtain silver particles with an average particle size of 1.3-1.7um through liquid phase reduction, and the specific surface area is 0.45~0.65m 2 / g, and then through surface modification treatment, the optimized parameters of silver particles are, the particle size is 1.2~1.5um, and the specific surface area is 0.3~0.4m 2 / g.

[0024] The liquid phase reduction in the present invention includes a reducing agent, and the reducing agent includes one or more of ascorbic acid, ethylene glycol, ferrous sulfate, hydroxylamine, hydrogen peroxide, and formaldehyde.

[0025] The modification treatment in the present invention includes a modifier, and the modifier includes one or more of hydroxyethyl cellulose, fatty amine, fatty amide and fatty acid lipid derivatives and hydrogenated castor ...

Embodiment 1

[0028] On the basis of the embodiment, the preparation of a kind of spherical silver powder of silver paste and the method for surface modification, comprise the following steps:

[0029] Step 1, place 10kg of silver nitrate in the batching kettle, add 10-100L of deionized water, stir for 30 minutes until the silver nitrate is completely dissolved, and adjust the pH value of 1 to 5 with nitric acid for use;

[0030] Step 2, place 5~10kg of ascorbic acid in the batching kettle, add 20~200L of deionized water, stir for 30 minutes until the ascorbic acid is completely dissolved, adjust the pH value of 1~10 with acid or ammonia water for use;

[0031] Step 3, after dissolving 0-100 grams of dispersant in ionized water, add the ascorbic acid solution in step 2 to disperse evenly;

[0032] Step 4. Under the rotating speed of 200~500rpm, the silver nitrate solution in step 1 is evenly and quickly added to the ascorbic acid solution in step 2, and the supernatant liquid is precipitate...

Embodiment 2

[0037] On the basis of Embodiment 1, a method for preparing spherical silver powder of silver paste and surface modification, comprising the following steps:

[0038] Step 1, place 10kg of silver nitrate in the batching kettle, add 50L of deionized water, stir for 30 minutes until the silver nitrate is completely dissolved, and adjust the pH value of 4 with nitric acid for use;

[0039] Step 2, place 5kg ascorbic acid in the batching kettle, add 30L of deionized water, stir for 30 minutes until the ascorbic acid is completely dissolved, adjust the pH value 3 with acid or ammonia water for use;

[0040] Step 3, after dissolving 40 grams of malic acid in ionized water, add the ascorbic acid solution in step 2 to disperse evenly;

[0041] Step 4. Add the silver nitrate solution in step 1 to the ascorbic acid solution in step 2 evenly and quickly at 300 rpm, react for 30 minutes and take the supernatant to test the residual amount of silver in the solution with an automatic titrat...

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Abstract

The invention relates to a preparation and surface modification method of spherical silver powder suitable for electronic silver paste, which comprises the following steps: reducing a silver source solution containing silver ions into silver particles with the average particle size of 1.3-1.7 mu m and the specific surface area of 0.45-0.65 m < 2 > / g through liquid phase reduction, and then carrying out surface modification treatment to optimize the silver particles with the particle size of 1.2-1.5 mu m and the specific surface area of 0.3-0.4 m < 2 > / g. According to the method, the requirement for the particle size of the silver powder can be improved, the preparation process is simple, efficient mass production can be achieved, and meanwhile the quality requirement can be improved.

Description

technical field [0001] The invention relates to a preparation and surface modification method of spherical silver powder suitable for electronic silver paste. Background technique [0002] Silver powder is widely used in photovoltaic silver paste because of its good electrical conductivity. Photovoltaic silver paste consists of three parts: conductive phase, binder phase and organic carrier. The conductive phase is the functional phase of photovoltaic silver paste, that is, silver powder. The dispersion degree of the silver powder in the conductive silver paste in the organic carrier has a great influence on the printing quality of the conductive silver paste and the adaptability of the production process. [0003] A large number of studies have shown that the currently used spherical silver powder has the appearance of hard agglomerates of dendritic particles extending in all directions, and the surface is rough. There is still a surface where the gas and the organic solve...

Claims

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Application Information

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IPC IPC(8): B22F9/24B22F1/065B22F1/052B22F1/14
CPCB22F9/24
Inventor 张树利徐晨王亚平朱万钢王越宋锴
Owner 苏州银瑞光电材料科技有限公司
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