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Method of preparing electric conductive adhesive by chemical plating silver on graphite powder surface

A technology of surface chemistry and graphite powder, applied in chemical instruments and methods, conductive materials dispersed in non-conductive inorganic materials, conductive adhesives, etc., to achieve the effect of simple raw material composition, good electrical conductivity, and easy mass production

Inactive Publication Date: 2007-02-28
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After literature and patent retrieval, it was not found that silver-coated graphite powder was prepared by the process formula of the present invention, and no silver-coated graphite powder was used as filler to prepare conductive adhesive

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Take 5 grams of graphite powder, heat and oxidize at 600°C in the air for 20 minutes; add 20% SnCl to the graphite powder 2 , 10% HCl aqueous solution, heat and boil for 5 minutes; after washing 3 times and filtering, add graphite powder to 0.03% PdCl, 1% AgNO 3 In aqueous solution, activate at room temperature for 5 minutes. Finally, filter, wash and dry for later use.

[0027] The above-mentioned graphite powder, 1 gram of sodium dodecylsulfonate, 12 grams of glucose, 15 milliliters of ethanol and 4 grams of polyethylene glycol were added to 200 milliliters of deionized water, and stirred to form a reducing solution; 3 grams of silver nitrate was added to 200 mL of deionized water, add 15 mL of ammonia water, stir to obtain a transparent solution. Add 1 g of sodium hydroxide, stir and add 5 ml of ammonia water to obtain a transparent silver amine solution. The reducing solution was added to the silver amine solution, stirred for 20 minutes, washed and filtered, and...

Embodiment 2

[0030] Take 7 grams of graphite powder, heat and oxidize it in the air at 600°C for 20 minutes; add 20% SnCl to the graphite powder 2 , 10% HCl aqueous solution, heat and boil for 7 minutes; after washing 3 times and filtering, add graphite powder to 0.03% PdCl, 1% AgNO 3 In aqueous solution, activate at room temperature for 7 minutes. Finally, filter, wash and dry for later use.

[0031] The above-mentioned graphite powder, 0.6 gram of sodium oleate, 15 grams of glucose, 25 milliliters of ethanol and 6 grams of polyethylene glycol were added to 210 milliliters of deionized water, and stirred to form a reducing solution; 6 grams of silver nitrate was added to 200 milliliters of deionized water , add 25 ml of ammonia water and stir to obtain a transparent solution. 2 g of sodium hydroxide was added, and after stirring, 8 ml of ammonia water was added to obtain a transparent silver amine solution. The reducing solution was added to the silver amine solution, stirred for 30 mi...

Embodiment 3

[0034] Take 10 grams of graphite powder, heat and oxidize it in the air at 640°C for 30 minutes; add 20% SnCl to the graphite powder 2 , 10% HCl aqueous solution, heat and boil for 7 minutes; after washing 3 times and filtering, add graphite powder to 0.03% PdCl, 1% AgNO 3 In aqueous solution, activate at room temperature for 7 minutes. Finally, filter, wash and dry for later use.

[0035] Add the above-mentioned graphite powder, 1 gram of sodium oleate, 25 grams of glucose, 30 milliliters of ethanol and 8 grams of polyethylene glycol into 300 milliliters of deionized water, stir to form a reducing solution; take 10 grams of silver nitrate and add 250 milliliters of deionized water , add 35 ml of ammonia water and stir to obtain a transparent solution. 2.6 g of sodium hydroxide was added, and after stirring, 12 ml of ammonia water was added to obtain a transparent silver amine solution. The reducing solution was added to the silver amine solution, stirred for 40 minutes, wa...

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PUM

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Abstract

The invention discloses a chemical silver plating preparing conducting resin method on the graphite powder surface in the chemical silver plating and micro-electronics connection material technique domain, which comprises the following steps: oxidizing the graphite powder in the air at 600-650DEG C; putting the dispersant, reducer and stabilizing agent in de-ionized water for reduced liquid; adding in graphite powder to stir; putting the silver nitrate in the de-ionized water; adding in ammonia and sodium hydroxide to get argentamine; putting the reduced liquid in the argentamine liquid to finish chemical silver plating on the graphite powder surface; filtering; separating and washing; drying in vacuum to get silver coated graphite powder.

Description

technical field [0001] The invention relates to an electroless silver plating on the surface of graphite powder and a method for preparing conductive adhesive by using the obtained powder as a conductive filler, belonging to the technical field of electroless silver plating and microelectronic connection materials. The obtained silver-plated graphite powder has the advantages of low density, easy dispersion and high conductivity. The conductive adhesive prepared by silver-plated graphite powder as a conductive filler has low price and similar electrical properties to pure silver conductive adhesive. It is used as a conductive connecting material in the fields of electronic devices and integrated circuits. Background technique [0002] Conductive adhesive has the advantages of lead-free pollution, low weight, and low curing temperature. As a conductive connection material, it is a substitute for tin-lead solder. Among all kinds of conductive adhesives, the conductive adhesiv...

Claims

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Application Information

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IPC IPC(8): C09C3/06C09C1/46C09J163/00C09J9/02H01B1/20H01L21/52H01L21/58
Inventor 梁彤祥郭文利闫迎辉唐春和
Owner TSINGHUA UNIV
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