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Method for preparing micron spherical silver powder

A silver powder and spherical technology, which is applied in the field of preparing micron spherical silver powder by chemical reduction method, can solve the problems of poor dispersion and many bubbles, and achieve good dispersion performance, less agglomeration and good water solubility

Inactive Publication Date: 2011-04-06
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] For overcoming above-mentioned bubble many, problems such as bad dispersibility, the object of the present invention is to provide a kind of method that prepares spherical silver powder with polyethylene glycol as dispersant, ethanol as defoamer

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A. Prepare the silver nitrate solution that is 0.3mol / L and the ascorbic acid solution that molar concentration is 0.3mol / L with deionized water respectively, by the mass ratio of ascorbic acid in the solution: silver nitrate=1.2: 1, get ascorbic acid solution and nitric acid respectively Silver solution, spare;

[0022] B. Get 10% polyethylene glycol of silver nitrate quality as dispersant, mix with ascorbic acid solution evenly, get mixed solution;

[0023] C. Take 25% ethanol with the mass of silver nitrate as the defoamer, add ethanol to the mixed solution in step B under the conditions of ultrasonic wave and 40°C and the rotating speed is 500r / min, and adjust the pH of the solution to 7 with ammonia water;

[0024] d. Add the silver nitrate solution in step A to the mixed solution in step C drop by drop, treat it with ultrasonic wave for 15 minutes, let it stand still, separate the liquid and fixed objects, wash the fixed objects twice with deionized water and ...

Embodiment 2

[0026] A. Prepare the silver nitrate solution that the molar concentration is 0.4mol / L and the ascorbic acid solution that the molar concentration is 0.4mol / L with deionized water respectively, by the mass ratio of ascorbic acid in the solution: silver nitrate=1.5: 1, get respectively ascorbic acid solution and nitric acid Silver solution, spare;

[0027] B. Get 8% polyethylene glycol of silver nitrate quality as dispersant, mix with ascorbic acid solution evenly, get mixed solution;

[0028] C. Take 50% ethanol with the mass of silver nitrate as the defoamer, add ethanol to the mixed solution in step B under the conditions of ultrasonic wave and 40°C and the rotating speed is 450r / min, and adjust the pH of the solution to 8 with ammonia water;

[0029] d. Add the silver nitrate solution in step A dropwise to the mixed solution in step C, treat it with ultrasonic waves for 10 minutes, let it stand still, separate the liquid and solid matter, wash the fixed matter with deio...

Embodiment 3

[0031] A. Prepare the silver nitrate solution that is 0.3mol / L and the ascorbic acid solution that molar concentration is 0.4mol / L with deionized water respectively, by the mass ratio of ascorbic acid in the solution: silver nitrate=1.3: 1, get ascorbic acid solution and nitric acid respectively Silver solution, spare;

[0032] B. Get 12% polyethylene glycol of silver nitrate quality as dispersant, mix with ascorbic acid solution evenly, get mixed solution;

[0033] C. Take 30% ethanol with the mass of silver nitrate as the defoamer, add ethanol to the mixed solution in step B under the conditions of ultrasonic wave and 40°C and the rotating speed is 550r / min, and adjust the pH of the solution to 6 with ammonia water;

[0034] d. Add the silver nitrate solution in step A to the mixed solution in step C dropwise, treat with ultrasonic waves for 12 minutes, let stand, separate, wash with deionized water for 3 times, wash with ethanol for 2 times, and dry at 50°C for 8 hours ...

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Abstract

The invention provides a method for preparing micron spherical silver powder. The method comprises the following steps of: preparing silver nitrate and ascorbic acid solution at certain concentration; mixing polyethylene glycol serving as a dispersant and the ascorbic acid solution; adding ethanol serving as a defoamer into the mixed liquor under stirring, and adjusting the pH value of the solution; and adding silver nitrate solution for reaction, standing, separating liquid from solid, and washing and drying the solid to obtain the micron spherical silver powder to ensure that the silver powder has a smooth surface, less agglomeration, high dispersibility, the impurity content of less than 5*10<-4>, the specific surface area of between 1.2 and 1.5 m<2> / g, the tap density of about 1.4 g / ml, the loose density of about 1.1 g / ml and the particle size distribution of between 0.5 and 1.13 mu m. Conductive silver paste can be prepared by grading the micron spherical silver powder and flake silver powder, and the micron spherical silver powder can be used for producing solar cell components, electronic components such as flake or circular ceramic capacitors and the like, automobile glass heating wires and the like.

Description

[0001] technical field [0002] The invention relates to a method for preparing silver powder, in particular to a method for preparing micron spherical silver powder by a chemical reduction method. Background technique [0003] In recent years, with the rapid development of electronic technology, the research and development of electronic materials has also experienced unprecedented development. Conductive paste is a very important branch of electronic materials, among which conductive silver paste has attracted much attention due to its many excellent properties. For example, a large amount of silver paste is used in the production of electronic components such as solar cell modules, chip (or round) ceramic capacitors, and automotive glass heating wires. Silver powder is an important part of silver paste. Generally, paste requires the particle size of silver powder to be in the micron range. The use of different dispersants to prepare various micron spherical silver powder...

Claims

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Application Information

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IPC IPC(8): B22F9/24
Inventor 甘国友严继康郑娅张磊朱华杜景红易健宏
Owner KUNMING UNIV OF SCI & TECH
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