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Nano-copper conductive slurry preparation method by utilizing printed circuit board alkaline etching waste liquid

A technology for printed circuit boards and etching waste liquid, which is applied in the direction of conductive materials, circuits, chemical instruments and methods dispersed in non-conductive inorganic materials, and can solve the problems of low recovery rate, low added value, complicated process, etc. problems, to achieve the effect of not harsh process conditions, good anti-oxidation performance and high economic benefits

Active Publication Date: 2012-11-28
GUANGDONG CHENGDE ELECTRONICS TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods have some disadvantages: ①The chemical precipitation method consumes a lot of alkali and the obtained CuO or CuSO 4 has low added value and low economic benefits
②The process of extraction electrodeposition method is relatively complicated, and the power consumption is relatively large, and the waste liquid after electrodeposition cannot meet the discharge standard
③ The direct electrodeposition method consumes a lot of energy, the recovery rate is not high, and the process is complicated

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0020] Get the alkaline etching waste liquid of No. 1 production line of a certain PCB factory in Foshan City. From it, take 50 milliliters (about 58.88 grams) of alkaline etching waste liquid and carry out three-stage filtration, collect the filtrate after filtration, add 0.50 gram Tween, 0.500 gram polyvinylpyrrolidone and 0.50 gram water-based defoamer BYK- 023 as A solution. Prepare reducing solvent B containing 4.00 g of hydrazine hydrate, 6 g of sodium hydroxide, and 50 ml of turpentine. Pour solution B into a three-necked flask, adjust the temperature of the constant temperature water bath at 80°C, start stirring, and the stirring speed is about 200 rpm. Add solution A dropwise into the three-necked flask, take it out after the reaction, cool and age. Then transfer the reacted solution to a separatory funnel, remove the water phase, collect the organic oil layer, first add a dispersant to the organic phase and perform ultrasonic stirring for 30 minutes, after the ul...

example 2

[0022] Get the alkaline etching waste liquid of the No. 2 production line of a certain PCB manufacturing plant in Foshan City, from which get 50ml (about 58.88 grams) alkaline etching waste water and carry out three-stage filtration, collect the filtrate after filtering, add 1.0 grams of polyvinylpyrrolidone and 0.50 g of defoamer BYK-023 from Germany was used as solution A. A reducing solvent B containing 4.00 grams of sodium borohydride, 6 grams of potassium hydroxide, and 50 ml of wood turpentine was prepared. Pour solution B into a three-necked flask, adjust the temperature of the constant temperature water bath at 85°C, start stirring, and the stirring speed is about 200 rpm. Add solution A dropwise into the three-necked flask, take it out after the reaction, cool and age. Then transfer the reacted solution to a separatory funnel, remove the water phase, collect the organic oil layer, first add a dispersant to the organic phase and perform ultrasonic stirring for 30 mi...

example 3

[0024] Take the alkaline etching waste liquid of No. 2 production line of a certain PCB manufacturing plant in Foshan City, take 100ml (about 117.77 grams) of alkaline etching waste water from it and carry out three-stage filtration, collect the filtrate after filtration, add 2.00 grams of Tween and 1.00 grams of water-based disinfectant at the same time Foaming agent Germany BYK BYK-051 as A solution. Prepare reducing solvent B containing 8.00 grams of hydrazine hydrate, 12 grams of potassium hydroxide, and 80 ml of gum turpentine. Pour solution B into a three-necked bottle, adjust the temperature of the constant temperature water bath at 70°C, start stirring, and the stirring speed is about 200 rpm. Add solution A dropwise into the three-necked flask, take it out after the reaction, cool and age. Then transfer the reacted solution to a separatory funnel, remove the water phase, collect the organic oil layer, first add a dispersant to the organic phase and carry out ultras...

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Abstract

The invention relates to a method for utilizing alkaline etching waste liquid in a printed circuit board to prepare nano-copper which is made into nano-copper conductive slurry. The method comprises the following steps: filtering alkaline etching waste liquid, adding a nonionic surfactant of 0.43%-4.24% of alkaline etching waste liquid by weight and an aqueous antifoaming agent of 0.08%-1.61% of the alkaline etching waste liquid by weight, preparing a reaction solution A; preparing a reducing agent solution B which comprises a reducing agent of 1.70%-8.49% of the alkaline etching waste liquidby weight, a highly basic substance of 6.80%-10.20 % of the alkaline etching waste liquid by weight, and organic phase turpentine which is used for a phase-transfer agent and has a volume ratio of 1:1-1:2 to the alkaline etching waste liquid; carrying out heating and stirring, and adding the reaction solution A in to the reducing agent solution B drop by drop. The method has the characteristics of easy operation and small energy consumption, prepared nano-copper powder has good antioxidation performance, by utilizing the etching waste liquid, conductive slurry of a high added value is prepared, a high economic benefit is created, emission reduction and no pollution of waste water are realized, and resource recycling is achieved.

Description

technical field [0001] The invention relates to a method for extracting useful substances from alkaline etching waste liquid of printed circuit boards, in particular to prepare nano-copper from alkaline etching waste liquid in printed circuit boards and make it into conductive paste of nano-copper method. Background technique [0002] Alkaline etching is an essential process in the manufacture of printed circuit boards. As the etching continues, the concentration of copper ions in the etching solution will continue to rise. When the concentration of copper ions reaches a certain concentration, if no treatment is performed, the etching effect will be affected. However, most of the production plants are discharged after simple treatment, which not only wastes a lot of precious resources but also causes serious environmental pollution. [0003] The main components of the alkaline etching solution are copper ammonium complex, ammonium chloride and ammonia water, and the mass c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B13/00H01B1/22C02F9/04C02F101/20
Inventor 吴子坚陈良陈世荣罗小虎刘镇权朱闻文潘湛昌罗观和
Owner GUANGDONG CHENGDE ELECTRONICS TECH CO LTD
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