Preparation method of silver-copper coating powder

A technology of coating powder and silver-copper, applied in the direction of coating, etc., can solve the problems of inconvenient operation, complexity, and insufficient density, and achieve the effects of reducing the components of the reaction system, dense silver coating layer, and controlling the reaction speed

Active Publication Date: 2013-03-06
JIANGSU BOQIAN NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The preparation method of the silver-copper-coated powder described above mostly needs to add some additives, such as reducing agents A, B, silver ammonia solution and other foreign substances. These raw material components are relatively complicated, and the reaction process steps are relatively complicated and difficult to operate. It is simple and convenient, and the reaction conditions of the above preparation method are not easy to control, which affects the formation effect of the silver coating layer, making the coating layer not uniform and dense enough

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Weigh 10g of 1.0μm spherical copper powder, add 200ml of dilute sulfuric acid with a concentration of 3%, stir in an ultrasonic mixer for 5min, filter, wash with deionized water, then add dilute acid solution for washing, and finally wash the copper repeatedly with deionized water powder until the washing liquid is neutral. Weigh 6 g of disodium edetate, add 400 ml of deionized water and stir to form a complex solution, then add the deoxidized copper powder solution into the disodium edetate solution, and stir in an ultrasonic mixer for 10 minutes , and mix evenly to obtain a reducing solution. Weigh 2.42g of silver sulfate, disperse and stir in an ultrasonic mixer, and add silver sulfate to the reducing solution at an amount of 0.1g / min. After the silver sulfate was added, the reaction was continued for 30 min. After the reaction was completed, 5 ml of ammonia water was added and stirred to remove residual silver sulfate and disodium edetate. Finally, the reaction s...

Embodiment 2

[0018] Weigh 30g of flake copper powder with a thickness of 1.0μm, add 200ml of dilute sulfuric acid with a concentration of 5%, put it in an ultrasonic mixer and stir for 10min, filter, wash with deionized water, then add dilute acid solution for washing, and finally use The copper powder was repeatedly washed with ionized water until the washing solution was neutral. Weigh 38g of disodium edetate, add 400ml of deionized water and stir to form a complex solution, then add the treated copper powder solution into the disodium edetate solution, stir in an ultrasonic mixer for 15min, and mix uniform to obtain a reducing solution. Weigh 16.48g of silver sulfate, disperse and stir in an ultrasonic mixer, and add silver sulfate to the reducing solution at an amount of 0.3g / min. After the silver sulfate was added, the reaction was continued for 30 min. After the reaction was completed, 10 ml of ammonia water was added and stirred to remove residual silver sulfate and disodium edeta...

Embodiment 3

[0020] Weigh 100g of spherical copper powder with a particle size of 5.0 μm, add 500ml of dilute sulfuric acid with a mass concentration of 5%, place it in an ultrasonic mixer and stir for 15 minutes to remove the oxide layer on the surface of the copper powder, filter, and wash with deionized water until the solution becomes neutral. sex. Weigh 58.9 g of disodium EDTA, add 1000 ml of deionized water and stir to form a complex solution, then add the treated copper powder solution into the disodium EDTA solution, stir ultrasonically for 15 minutes to mix evenly, and obtain a reducing solution. Weigh 24.17g of silver sulfate, disperse and stir in an ultrasonic mixer, and add silver sulfate to the reducing solution at a speed of 0.1g / min. After the silver sulfate was added, the reaction was continued for 50 min. After the reaction was completed, 5 ml of ammonia water was added and stirred to remove residual silver sulfate and disodium edetate. Finally, the reaction solution was...

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Abstract

The invention discloses a preparation method of silver-copper coating powder. The preparation method comprises the following steps of: weighing 5-200 grams of copper powder, adding 10-500 milliliters of dilute acid solutions with the concentration of 1%-10%, placing into an ultrasonic stirrer, and stirring for 1-30 minutes; filtering, adding the dilute acid solutions for washing, and finally repeatedly washing the copper powder by using deionized water till washing liquid is neutral; adding the copper powder subjected to oxidation treatment to a solution with a dissolved complexing agent, placing into the ultrasonic stirrer, and stirring for 1-30 minutes to obtain a reducing solution; then adding silver sulfate to the reducing solution at the amount of 0.05-0.5 gram / minutes, and then continuously reacting for 30-60 minutes after the silver sulfate is completely added, wherein the molar ratio of the complexing agent solution to the silver sulfate solution is 2:1; adding 1-50 milliliters of ammonia water to remove the silver sulfate and the complexing agent which are remained in a reaction solution after the reaction is finished; and finally filtering the reaction solution, washing, and drying to obtain the silver-copper coating powder. The preparation method of the silver-copper coating powder, which is disclosed by the invention, simplifies the craft process, is conductive to controlling the integral reaction and ensures that a formed silver coating layer is compact.

Description

technical field [0001] The invention belongs to the technical field of material preparation, and in particular relates to a preparation method of silver-copper coated powder. Background technique [0002] As the main component of conductive paint and conductive paste, ultra-fine silver powder has the best conductivity among all metals, and its conductivity is 1.62×10 -6 Ω cm, in addition, silver also has the advantages of good oxidation resistance and stable performance, but silver is expensive and resources are scarce, and the cost of using silver as a raw material to prepare conductive coatings is relatively high. Copper has excellent electrical conductivity, and its electrical conductivity is 1.70×10 -6 Ω·cm, and the price is only one-twentieth of silver, but because copper is very active, it is difficult for ultra-fine copper powder to exist stably, and the oxidation phenomenon is serious, and the finer the particle size of copper powder, the larger its specific surface...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02B22F9/24
Inventor 王翠霞周峰王铠尧陈钢强王利平
Owner JIANGSU BOQIAN NEW MATERIALS
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