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Preparation method for electric conduction flake silver-coated copper powder

A technology of flake copper powder and silver-coated copper powder, applied in transportation and packaging, metal processing equipment, coating and other directions, can solve the problems of easy oxidation, high temperature resistance, poor electrical conductivity, etc., and is not easy to be oxidized. , storage stability, good electrical conductivity

Active Publication Date: 2018-11-16
深圳市绚图新材科技有限公司
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  • Summary
  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the silver-coated copper powder prepared by the method commonly used in the industry has a low silver content, and the silver coated on the surface accumulates in a tree shape, the coating layer is uneven and incomplete, and the copper is exposed in the air, which is easily oxidized, resulting in electrical conductivity. Not good, and not resistant to high temperature

Method used

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  • Preparation method for electric conduction flake silver-coated copper powder
  • Preparation method for electric conduction flake silver-coated copper powder

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preparation example Construction

[0016] The preparation method of conductive flake silver-coated copper powder proposed by the present invention adopts tin protochloride to activate copper powder first, forms crystal points on its surface, and makes the surface coating of flake copper powder uniform, to improve the conductivity and stability. The main preparation process is:

[0017] The first step is to clean the surface of the copper powder with an ethanol solution of stannous chloride, and at the same time make the tin ions adsorb to the surface of the copper powder. Using ethanol as the solvent can effectively wash off the oily substances on the surface, and at the same time avoid large areas of copper and water. Contact results in secondary oxidation of the surface.

[0018] The second step uses the tin ions adsorbed on the surface to form a layer of silver crystal points on the copper surface.

[0019] The third step is the oxidation-reduction reaction, which continues to deposit silver on the copper ...

Embodiment 1

[0022] The first step: copper surface cleaning and activation

[0023] Add 20g of flake copper powder into the cleaning solution and stir for 20 minutes. After removing the oxide layer and oily substances on the surface of the flake copper powder, filter, add the filter cake to the reaction kettle, and then add an aqueous organic amine solution to the reaction kettle once, and stir evenly.

[0024] Wherein, the cleaning solution is obtained by adding 1 g of stannous chloride into 130 ml of ethanol and stirring evenly. The primary organic amine aqueous solution is prepared by mixing 75ml of deionized (DI) water and 1g of tetraethylenepentamine.

[0025] The second step: the formation of crystal points on the copper surface

[0026] Add 0.2 g of gum arabic to the secondary organic amine aqueous solution to obtain a mixed solution, and then add the mixed solution into the reaction kettle. Add the silver nitrate solution dropwise into the reaction kettle, continue to react at r...

Embodiment 2

[0033] The first step: copper surface cleaning and activation

[0034] Add 20g of flake copper powder into the cleaning solution and stir for 20 minutes. After removing the oxide layer and oily substances on the surface of the flake copper powder, filter, add the filter cake to the reaction kettle, and then add an aqueous organic amine solution to the reaction kettle once, and stir evenly.

[0035] Wherein, the cleaning solution is obtained by adding 1 g of stannous chloride into 130 ml of ethanol and stirring evenly. The primary organic amine aqueous solution is prepared by mixing 75ml of deionized (DI) water and 1g of tetraethylenepentamine.

[0036] The second step: the formation of crystal points on the copper surface

[0037] Add 0.2 g of gum arabic to the secondary organic amine aqueous solution to obtain a mixed solution, and then add the mixed solution into the reaction kettle. Add the silver nitrate solution dropwise into the reaction kettle, continue to react at r...

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Abstract

The invention discloses a preparation method for electric conduction flake silver-coated copper powder. The preparation method comprises the steps that the flake copper powder is washed and activated;crystal points on the surface of the copper powder are formed; silver is subjected to deposition to completely wrap the copper powder; and the silver-coated copper powder is firstly washed with water, then washed with ethyl alcohol and finally dried to prepare the electric conduction flake silver-coated copper powder. Compared with an existing preparing technology, the content of the coated silver powder can be very high, the prepared silver-coated copper powder is even in wrapping, exposure into air is avoided, oxidation is not prone to happening, the electric conduction performance is good,and storage is stable.

Description

technical field [0001] The invention relates to a coating treatment technology on the surface of metal powder, in particular to a preparation method of conductive flake-shaped silver-coated copper powder which can be used as conductive particles in conductive coatings and conductive inks. Background technique [0002] The conductive particles used in conductive coatings and conductive inks are mainly micron-sized highly conductive metals, such as silver, copper, nickel, aluminum and other metal powders, and can also be powders of graphite and carbon black. Among all metals, silver has the best electrical conductivity. Currently, pure silver powder is used as conductive particles to dominate the market. Because silver has good oxidation resistance, and silver oxide is also conductive. However, the high price of silver limits the use of such conductive materials to a certain extent. In order to reduce costs, conductive particles can also be made of copper powder, nickel powd...

Claims

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Application Information

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IPC IPC(8): B22F1/02
CPCB22F1/068B22F1/17
Inventor 林海晖梁嘉静曹彩丹
Owner 深圳市绚图新材科技有限公司
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