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
  • Description
  • Claims
  • 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,

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

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0016] The preparation method of conductive flaky silver-coated copper powder proposed in the present invention uses stannous chloride to activate the copper powder first to form crystal points on its surface and uniformly coat the surface of the flaky copper powder to improve the performance of the flaky copper powder. 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 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 avoid large areas of copper and water. Contact causes secondary oxidation of the surface.

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

[0019] In the third step, the oxidation-reduction reaction continues to deposit silver on the coppe...

Example Embodiment

[0021] Example 1

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

[0023] Add 20 g of flake copper powder to the cleaning solution and stir for 20 minutes. After removing the oxide layer and oily substances on the surface of the flaky copper powder, it is filtered, the filter cake is added to the reactor, and then the organic amine aqueous solution is added to the reactor once, and the mixture is stirred evenly.

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

[0025] Step 2: Formation of crystal points on the copper surface

[0026] 0.2 g of gum arabic is added to the secondary organic amine aqueous solution to obtain a mixed solution, and then the mixed solution is added to the reaction kettle. The silver nitrate solution was added dropwise to the reactio...

Example Embodiment

[0032] Example 2

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

[0034] Add 20 g of flake copper powder to the cleaning solution and stir for 20 minutes. After removing the oxide layer and oily substances on the surface of the flaky copper powder, it is filtered, the filter cake is added to the reactor, and then the organic amine aqueous solution is added to the reactor once, and the mixture is stirred evenly.

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

[0036] Step 2: Formation of crystal points on the copper surface

[0037] 0.2 g of gum arabic is added to the secondary organic amine aqueous solution to obtain a mixed solution, and then the mixed solution is added to the reaction kettle. The silver nitrate solution was added dropwise to the reactio...

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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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