Preparation method of micron grade ball shape silver powder for conductive silver paste

A conductive silver paste, micron-scale technology is applied in the field of preparation of conductive silver paste in the electronic industry, which can solve the problems of difficulty in controlling the pH value of the system, increase cost, toxicity, etc., achieve stable and reliable process conditions, improve economic benefits, and process Simple and feasible process

Inactive Publication Date: 2006-06-14
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the preparation method of Publication No. CN1387968, it is difficult to control the pH value of the system, which is not suitable for large-scale industrial production; and, in this invention, the reducing agent mixed solution is poured into the silver nitrate solution to mix and react, and it is not suitable to control the Ag particles. nucleation and growth of crystal nuclei
In the method for preparing the finely divided and dense spherical silver powder of publication number CN1106326A, a sufficient amount of alkanolamines will be added when preparing fully dissolved silver-alkanolamine complexes, so that the cost has been greatly increased; in addition , some reagents such as hydroquinone are toxic during the implementation of this invention, and are not suitable for large-scale industrial production, and the pH values ​​of the alkanolamines used are all in the alkaline range, so it is not conducive to production at pH values Ultrafine silver powder that can be prepared under relatively small conditions

Method used

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  • Preparation method of micron grade ball shape silver powder for conductive silver paste
  • Preparation method of micron grade ball shape silver powder for conductive silver paste
  • Preparation method of micron grade ball shape silver powder for conductive silver paste

Examples

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example 1

[0018] According to attached figure 1 As shown in the process flow chart, first, weigh 3g of ascorbic acid, dissolve it in 30ml deionized water, and make solution A; weigh 0.2g polyvinylpyrrolidone, dissolve it in 20ml deionized water, and make solution B; Pour solution A into a 250ml four-neck round bottom flask, heat it in a water bath to a temperature of 60°C, and adjust the stirring speed to 300r / min; then, add the prepared solution B into solution A, and stir for about ten minutes until the entire reduction The system is a homogeneous phase; take 5ml of 25-28% ammonia water and add 25ml of deionized water to make dilute ammonia solution C; weigh 5g of silver nitrate and dissolve it in 25ml of deionized water to make solution D; The solutions C and D were poured into two 250ml constant pressure dropping funnels respectively, and the dropping speed of solutions C and D was adjusted so that the pH value of the system was stabilized at 6±0.2; After the silver solution is add...

example 2

[0020] According to attached figure 1 As shown in the process flow chart, first, weigh 3g of ascorbic acid, dissolve it in 30ml deionized water, and make solution A; weigh 1g OP emulsifier, dissolve it in 20g of absolute ethanol, and make solution B; Pour A into a 250ml four-necked round-bottomed flask, heat it to a temperature of 35°C in a water bath, and adjust the stirring speed to 300r / min; then, add the prepared B solution into solution A, and stir for about ten minutes until the entire reduction system It is a homogeneous phase; take 5ml of 25-28% ammonia water, add 27ml of deionized water to make the concentration of the ammonia solution about 4%, and make solution C; weigh 5g of silver nitrate, dissolve it in 25ml of deionized water, and make solution D Then, pour solution C and D prepared into two 250ml constant-pressure dropping funnels respectively, adjust the dropping speed of solutions C and D so that the pH value of the system is stable at 4.4~4.6; control the wh...

example 3

[0022] According to attached figure 1 Shown process flow diagram, at first, take by weighing 3g ascorbic acid, be dissolved in 60ml deionized water, be made into solution A; Take by weighing 0.2g copper nitrate and 0.2g magnesium nitrate, be dissolved in 40ml deionized water, be made into solution B; Pour the prepared solution A into a 250ml four-neck round bottom flask, heat it in a water bath to a temperature of 60°C, and adjust the stirring speed to 400r / min; then, add the prepared solution B into solution A, and stir for ten minutes From left to right until the entire reduction system is a homogeneous phase; weigh 5g of silver nitrate, dissolve it in 50ml of deionized water, and make solution C; then, pour the prepared solution C into a 250ml constant pressure dropping funnel, and adjust the concentration of solution C. The dropping speed is such that the whole dropping process takes 5-10 minutes. After the silver nitrate solution is added dropwise, react for half an hour,...

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Abstract

A process for preparing the micron-class spherical silver powder used for electrically conductive Ag slurry features that in the redox procedure, the silver nitrate solution is dripped into reducer and disperser while the ammonia water is used to regulate the pH value of solution, and the kind of disperser, stirring speed, and reaction temp and time are regulated.

Description

technical field [0001] The invention relates to the preparation of metal powder for conductive paste, which is suitable for industrial large-scale production of spherical silver powder, and the obtained spherical high-purity ultrafine silver powder is suitable for the preparation of conductive silver paste in the electronic industry. Background technique [0002] Metal ultrafine powder itself has superior catalytic properties, magnetic properties, electrical properties, etc., so it has more and more applications in aerospace, atomic energy, electronics, powder metallurgy, chemical and other industries, as well as medicine and bioengineering. Among them, the application field of fine silver powder is very broad, and the application in the fields of electronics and electric power is particularly eye-catching, and it is mainly used in the preparation of conductive paste. Conductive paste is an important raw material in the electronics industry, and conductive coatings and condu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24
Inventor 林保平梁敏
Owner SOUTHEAST UNIV
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