Preparation method of silver-coated copper conductive powder

A silver-coated copper powder and conductive powder technology, which is applied in transportation and packaging, metal processing equipment, liquid chemical plating, etc., can solve the problems of poor coating effect, poor stability, and decreased electrical conductivity, and achieve reduced surface energy, Stable electrical conductivity, preventing agglomeration and sinking to the bottom

Pending Publication Date: 2022-03-01
深圳市绚图新材科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology describes an apparatus for dispersing fine metal particles (metal flakes) onto paper or other materials during printing processes. An acoustoelectric transducer called sonicator helps create strong waves within certain frequencies range, causing tiny droplets containing small metallic particles to break up into smaller ones when excited by sound waves. These minute drops are then transferred through pipes towards another location where they mix well together before being applied to material. By controllably adding different chemicals at specific points along this path, it becomes possible to achieve evenly mixed coatings without affecting any properties such as electrical conductivity. Additionally, there may include various agents like bismuth nitrate to further enhance its effectiveness against rustiness and degraded durability over time. Overall, these technical improvements make better ways to produce stable nanocomposite films made from metal nanoparticles.

Problems solved by technology

This technical problem addressed in this patents relates to finding ways to improve the quality (oxygen gas barrier) or durability of metal coatings made from fine particles of coirponsilver without losing much of it's original structure during manufacturing processes.

Method used

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  • Preparation method of silver-coated copper conductive powder
  • Preparation method of silver-coated copper conductive powder

Examples

Experimental program
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Embodiment 1

[0027] The first step: dissolve the oily copper powder slurry with a solid content of 1kg in 3kg of diethylene glycol butyl ether, add 25g of sulfuric acid and stir for 30min, filter it with suction, and rinse it with deionized water. After cleaning, the surface is oil-free. Flake copper powder with oxide layer. Organic solvent also can select ethanol for use. The acid may also be acetic acid.

[0028] Step 2: Add 8kg of deionized water containing 430g of EDTA-2Na to the ultrasonic reactor, and then turn on the ultrasonic generator; disperse the cleaned copper powder in the deionized water of the reactor, add 5g of polyvinylpyrrolidone, 5g of BYK180, 2g For ceric sulfate, add tetraethylenepentamine to adjust the pH value to 8. After stirring evenly, add 3.8L of 0.6mol / l silver ammonia solution dropwise with a peristaltic pump. The dropwise addition is completed in 2 hours. After continuing to react for half an hour, add 2L dropwise 0.6mol / l glucose solution, add dropwise in ...

Embodiment 2

[0034] Step 1: Dissolve 1 kg of oily copper powder in 3 kg of ethanol, add 30 g of acetic acid and stir for 30 minutes, filter with suction, rinse with deionized water, and obtain copper powder with no oil and no oxide layer on the surface after cleaning.

[0035] Step 2: Add 8kg of deionized water containing 523g of EDTA-4Na to the ultrasonic reactor, and then turn on the ultrasonic generator; disperse the cleaned copper powder in the deionized water of the reactor, and add 5g of polyoxyethylene octylphenol ether -10, 5g BYK180, 2g ceric sulfate, add ethylenediamine to adjust the pH value to 8, stir evenly, add 3.8L 0.6mol / l silver ammonia solution dropwise with a peristaltic pump, drop it completely in 2 hours, continue to react for half After one hour, 2.4 L of 0.5 mol / l ascorbic acid solution was added dropwise, and the reaction was continued for half an hour after the dropwise addition was completed in one hour. After the reaction is complete, filter and wash to obtain si...

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Abstract

The invention discloses a preparation method of silver-coated copper conductive powder. The preparation method comprises the following steps: step 1, cleaning: cleaning flaky copper powder by using an organic solvent and acid; 2, coating the surface of the copper powder with silver, wherein water and a complexing agent are added into an ultrasonic reaction kettle, and the ultrasonic reaction kettle is started for activation; putting the cleaned flaky copper powder into an ultrasonic reaction kettle, adding a surfactant, a stabilizer, ceric sulfate and a pH regulator, uniformly stirring, sequentially adding a silver-ammonia complexing solution and a reducing agent, reacting, cleaning, filtering and drying to obtain silver-coated copper powder; wherein the stabilizer is one of BYK180, BYK191 and BYK161, and the stabilizer is one of BYK180, BYK191 and BYK161; and 3, post-treatment of the silver-coated copper powder: the silver-coated copper powder is added into a kneading machine for low-speed kneading, stearic acid is added for kneading for a period of time, then a corrosion inhibitor is added for kneading, drying is performed after kneading is completed, and the silver-coated copper conductive powder is obtained. The silver-coated copper conductive powder which is good in appearance, compact in coating and stable in conductivity is prepared under the liquid phase condition by adopting a mode of combining matrix ultrasonic waves and double stirring.

Description

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Claims

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Application Information

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Owner 深圳市绚图新材科技有限公司
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