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A kind of preparation method of silver-coated copper powder with self-peeling film anti-oxidation

A technology of silver-coated copper powder and anti-oxidation, which is applied in transportation and packaging, metal processing equipment, coating, etc., can solve the problems of easy generation of oxide layer, etc., to improve the density, increase the coating rate, and improve the conductivity Effect

Active Publication Date: 2020-06-30
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

Problems solved by technology

[0004] In order to solve the problem that the oleic acid on the surface of the copper sheet is easy to produce an oxide layer in the preparation process of the existing silver-coated copper powder, a method for preparing a self-peeling film anti-oxidation silver-coated copper powder is provided.

Method used

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  • A kind of preparation method of silver-coated copper powder with self-peeling film anti-oxidation
  • A kind of preparation method of silver-coated copper powder with self-peeling film anti-oxidation
  • A kind of preparation method of silver-coated copper powder with self-peeling film anti-oxidation

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preparation example Construction

[0026] A kind of preparation method of the anti-oxidation silver-coated copper powder of self-peeling film that the present invention proposes, its steps are as follows:

[0027] 1: Put the copper powder in the alcohol solution, stir and clean it, and clean the copper powder filter cake after filtering.

[0028] Wherein, the alcoholic solution may be any one of ethanol, isopropanol, n-butanol or isobutanol. The ratio of copper powder to alcohol solution is 3:10. The stirring speed during cleaning is 150rpm, and the stirring time is 10-30min. The alcohol solution can dissolve the grease and thoroughly clean the oxide and oleic acid on the surface of the copper sheet.

[0029] 2: Place the sugar solution in a beaker and heat it while stirring until the sugar is completely dissolved, and place it at room temperature.

[0030] Wherein, the sugar solution is mixed by the following raw materials in weight percentage: sucrose 17-30%; glucose 25-40%; fructose 25-40%; deionized wate...

Embodiment 1

[0040] Embodiment 1 is to adopt existing preparation method

[0041] Step 1: Put 20g of copper powder in 100g of ethanol solution, stir and wash for 15 minutes, thoroughly remove oleic acid and oxides on the surface of the copper sheet, and obtain the cleaned copper powder filter cake after filtering.

[0042] Step 2: Transfer the coated copper powder filter cake to the reaction kettle, add deionized water, and the weight ratio of copper powder filter cake to water is 1:10. Heat to 50°C and stir at 150rpm. Dissolve 15g of silver nitrate in 170g of deionized water, add dropwise 14g of ammonia solution to make the solution colorless and transparent, and prepare silver ammonia solution; dissolve 5g of tartaric acid in 195g of deionized water, and prepare reducing agent solution. At the same time, 200 g of silver ammonia solution and 200 g of tartaric acid solution were added dropwise to carry out silver deposition, and the dropwise addition was controlled within 2 hours. The do...

Embodiment 2

[0045] Step 1: Put 30g of copper powder into 100g of isopropanol solution, stir and wash for 20 minutes, thoroughly remove oleic acid and oxides on the surface of the copper sheet, and obtain the cleaned copper powder filter cake after filtering.

[0046] Step 2: Mix 2.4g sucrose, 1.6g glucose, 1.6g fructose and 2.4g deionized water in a beaker, heat to 50°C while stirring until the sugars are completely dissolved to obtain a sugar solution, and place it at room temperature.

[0047] Step 3: Add the cleaned copper powder filter cake into the sugar solution, and the dosage ratio of the cleaned copper powder filter cake to the sugar solution is 5:2.

[0048]Stir at a speed of 170rpm for 25 minutes. At this time, the surface of the cleaned copper powder will form an anti-oxidation protective sugar film, and filter to obtain a coated copper powder filter cake.

[0049] Step 4: Transfer the coated copper powder filter cake to the reaction kettle, add deionized water, and the weight...

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Abstract

The invention discloses a preparation method of silver-coated copper powder with anti-oxidation self-peeling film. The steps include: 1: placing the copper powder in an alcohol solution, stirring and cleaning, and filtering to obtain a cleaned copper powder filter cake; 2: Heat the sugar solution while stirring until the sugars are completely dissolved, and place it at room temperature; 3: Add the cleaned copper powder filter cake to the sugar solution, stir, and filter to obtain a coated copper powder filter cake; 4: Put the coated copper powder filter cake Add deionized water to the copper powder filter cake, heat and stir, and at the same time dropwise add silver ammonia solution and reducing agent to carry out silver deposition; 5: After the dropwise addition, filter and dry to obtain silver-coated copper powder. Use sugar solution to form an anti-oxidation protective film on the surface of copper powder without being oxidized. During the silver deposition process, as the temperature rises, the sugar film dissolves and peels off, making room for the silver layer to grow. By preparing a self-stripping sacrificial film for copper powder anti-oxidation protection, the density of the silver layer is improved, the coating rate of silver is increased, silver nitrate is saved, and the conductivity of the silver-coated copper powder is improved.

Description

technical field [0001] The invention relates to the technical field of conductive fillers, in particular to a preparation method of self-stripping and anti-oxidation silver-coated copper powder. Background technique [0002] With the rapid development of the 3C industry, electronic components gradually tend to be miniaturized, sliced, and multi-layered. Therefore, the demand for electronic pastes such as conductive coatings and conductive pastes is increasing day by day. Among conductive fillers, silver powder is the most widely used. Coating a layer of silver on the surface of copper to prepare a composite powder with a core / shell structure can overcome the disadvantages of high price of silver powder and easy oxidation of copper powder at the same time, so that it becomes a conductive filler with low price and good conductivity. In the process of preparing silver-coated copper powder by the aqueous phase method, after the surface of the copper powder is cleaned with olei...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/02B22F9/24
CPCB22F9/24B22F1/17
Inventor 林海晖梁嘉静曹彩丹王圣持
Owner 深圳市绚图新材科技有限公司