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Flake silver powder as well as preparation method and application thereof

A flake silver powder and silver powder technology, which is applied in transportation and packaging, metal processing equipment, cable/conductor manufacturing, etc., can solve the problems of increasing types of residual substances on the surface, increasing the difficulty of cleaning, and affecting the use of products. It is suitable for large-scale Industrial production, good sheet structure, easy to handle effect

Active Publication Date: 2021-03-30
CHANGSHA ADVANCED MATERIALS IND RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in practical application, the preparation of conductive silver paste is mainly based on micron silver powder, which can ensure the dispersion in the carrier while ensuring the conductivity of the prepared slurry. In addition, the preparation method uses a mixed solution containing a reducing agent. Adding to the silver ammonia solution by dropping, the overall preparation time is longer, and the power consumption cost of the overall production is higher
In addition, the Chinese invention patent with the application number 201711060549.X discloses a method for preparing nano-scale flake silver powder by chemical method, but in the operation, silver nitrate alone needs to be used to prepare seed crystals, which is cumbersome to operate, and three kinds of surfactants are added to increase the It increases the difficulty of subsequent cleaning, and the types of residual substances on the surface increase, which is easy to affect the use of products

Method used

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  • Flake silver powder as well as preparation method and application thereof
  • Flake silver powder as well as preparation method and application thereof
  • Flake silver powder as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044]Take 10g of silver nitrate and add it to 250g of deionized water, stir and dissolve it fully, add 1g of polyvinylpyrrolidone to the silver nitrate solution; dissolve another 6.5g of ascorbic acid in 250g of deionized water to make a reducing agent solution; add ammonia solution to the silver nitrate solution Regulate pH to 10, stir to make solution clarification, promptly the concentration of silver ion in the solution containing silver ion is 0.24mol / L, dispersant is 10wt% of silver source; Get 20% ascorbic acid solution and join in 20% silver nitrate solution, fully After 20 minutes, use a peristaltic pump to add the remaining silver nitrate solution and ascorbic acid solution into the reaction solution, continue to stir and reduce, the stirring rate is 1000r / min, and the reaction temperature is controlled at 20°C.

[0045] After the reaction was completed, the reaction solution was separated from solid and liquid, washed three times with deionized water, then washed on...

Embodiment 2

[0048] Dissolve 10g of silver nitrate in 250g of deionized water, add 1.5g of polyvinylpyrrolidone to the silver nitrate solution; dissolve another 6.5g of ascorbic acid in 250g of deionized water to make a reducing agent solution; add ammonia solution to the silver nitrate solution to adjust the pH To 10, stir to make the solution clear, that is, the concentration of silver ions in the solution containing silver ions is 0.24mol / L, and the dispersant is 15wt% of the silver source; 20% ascorbic acid solution is added to 20% silver nitrate solution, fully stirred and reduced After 20 minutes, use a peristaltic pump to add the remaining silver nitrate solution and ascorbic acid solution into the reaction solution, continue to stir for reduction, the stirring rate is 1000r / min, and the reaction temperature is controlled at 25°C.

[0049] After the reaction was completed, the reaction solution was separated from solid and liquid, washed three times with deionized water, then washed ...

Embodiment 3

[0052] Dissolve 10g of silver nitrate in 250g of deionized water, fully dissolve 1.5g of ethyl cellulose in 20ml of ethanol, add the ethyl cellulose solution into the silver nitrate solution, and mix well; another 6.5g of ascorbic acid is dissolved in 250g of Make a reducing agent solution in deionized water; add ammonia solution to the silver nitrate solution to adjust the pH to 9, stir to make the solution clear, that is, the concentration of silver ions in the silver ion solution is 0.24mol / L, and the dispersant is 15wt% of the silver source Get 40% ascorbic acid solution and join in 40% silver nitrate solution, fully stir reduction, use peristaltic pump to join remaining silver nitrate solution and ascorbic acid solution in the reaction solution after 20min, continue stirring reduction, stirring speed 900r / min, reaction The temperature was controlled at 35°C.

[0053] After the reaction was completed, the reaction liquid was separated from solid and liquid, washed once wit...

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Abstract

The invention relates to flake silver powder as well as a preparation method and application thereof.The preparation method comprises the following steps that S1, a silver source is dissolved in deionized water to prepare a solution containing silver ions, a reducing agent is dissolved in the deionized water to obtain a reducing agent solution, and the concentration range of the silver ions in thesolution containing the silver ions is 0.22 mol / L; S2, a pH regulating solution is prepared, the pH regulating solution is added into the solution containing the silver ions, and the pH value of thesolution is regulated to 8-12; S3, a dispersing agent is added into the solution containing the silver ions, and uniform stirring is carried out; S4, at the temperature of 20-60 DEG C, the solution containing the silver ions and the reducing agent solution are fully mixed and reduced in the stirring process to obtain silver particles, part of the reducing agent solution is added into part of the solution containing the silver ions in the mixing process, and after full reduction stirring, the remaining reducing agent solution and the solution containing the silver ions are added into a system at the same time; and continuous stirring and reduction are carried out until the reaction is finished, solid-liquid separation is carried out on the reaction liquid, washing and drying are carried outto obtain the flake silver powder. According to the preparation method, the particle size and the sheet diameter of the prepared silver powder are regulated and controlled, operation is easy, and different use requirements can be met.

Description

technical field [0001] The invention relates to a conductive metal powder and a preparation method thereof, in particular to a flake silver powder, a preparation method and application thereof. Background technique [0002] As the main component of conductive silver paste, silver powder mainly plays the role of functional phase in silver paste. The morphology, dispersion, particle size and other parameters of the silver powder are directly related to the mechanical, electrical and printing properties of the conductive paste, thus affecting the conductivity of electronic components. The quality of the silver powder determines whether the conductive paste can meet the requirements. Electronic product performance requirements. [0003] At present, the silver powders used in the preparation of conductive pastes are mainly spherical silver powders and flake silver powders. Among them, flake silver powder is an important part of the electrode paste of surface mount components. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B22F1/00H01B1/22H01B13/00
CPCB22F9/24H01B1/22H01B13/00B22F1/068Y02E10/50
Inventor 孙娅刘飞全马锦
Owner CHANGSHA ADVANCED MATERIALS IND RES INST CO LTD
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