A kind of cyanide-free gold plating method for preparing acf conductive gold ball
A technology of cyanide-free gold plating and conductive gold balls, which is applied in the direction of liquid chemical plating, metal material coating process, coating, etc., can solve the problems affecting the social safety of operators, the amount of adsorption is small, and the coating is easy to fall off. The effect of application prospect, improvement of binding force and stabilization of plating solution
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Embodiment 1
[0049] Add 20 g of polystyrene microspheres and 20 g of dichloroethane into a three-necked flask equipped with a stirrer, ultrasonically disperse, and stir and swell at 300 rpm for 1 hour to obtain swollen polystyrene microspheres. In a three-necked flask equipped with a stirrer, a dropping funnel, a thermometer and a condenser equipped with a calcium chloride drying tube, add 20 g methylal, and add 35 g sulfuryl chloride dropwise within 1 hour at 25°C , And react for 1 hour to obtain the mixed solution after reaction. Pour this mixture into the swollen polystyrene microspheres, stir at 300 rpm for 3 hours, then add 8 g of anhydrous zinc chloride powder into the reaction system, and stir at 40°C for 8 hours. Centrifugation and washing to obtain chloromethylated polystyrene microspheres. Add the obtained chloromethylated polystyrene microspheres into a three-necked flask containing 100ml of 5% NaOH solution, 4 Under the condition of NOH as catalyst, add 40g 2,3-dimercaptopropan...
Embodiment 2
[0053] Disperse 25 g of polystyrene microspheres in 25 g of dichloroethane ultrasonically, then add them to a three-necked flask equipped with a stirrer, stir and swell at 300 rpm for 1 hour to obtain swollen polystyrene microspheres. In a three-necked flask equipped with a stirrer, a dropping funnel, a thermometer and a condenser equipped with a calcium chloride drying tube, add 22 g of methylal and add 39 g of sulfuryl chloride dropwise within 1 hour at 25°C. , And react for 1 hour to obtain the mixed solution after reaction. Pour this mixture into the swollen polystyrene microspheres, and stir at 300 rpm for 3 hours. Then 10g of anhydrous zinc chloride powder was added to the above reaction system and stirred at 40°C for 8 hours. Centrifugation and washing to obtain chloromethylated polystyrene microspheres. Add the obtained chloromethylated polystyrene microspheres into a three-necked flask containing 150ml of 5% NaOH solution, 4 Under the condition of NOH as the catalyst...
Embodiment 3
[0057] 30 g of polystyrene microspheres were ultrasonically dispersed in 30 g of dichloroethane, added to a three-necked flask equipped with a stirrer, and stirred and swelled at 300 rpm for 1 hour to obtain swollen polystyrene microspheres. In a three-necked flask equipped with a stirrer, a dropping funnel, a thermometer and a condenser equipped with a calcium chloride drying tube, add 25g methylal, and add 45g sulfuryl chloride dropwise within 1 hour at 25°C , And react for 1 hour to obtain the mixed solution after reaction. Pour this mixture into the swollen polystyrene microspheres, stir at 300 rpm for 3 hours, then add 12 g of anhydrous zinc chloride powder to the reaction system, and stir at 40°C for 8 hours. Centrifugation and washing to obtain chloromethylated polystyrene microspheres. Add the obtained chloromethylated polystyrene microspheres to a three-necked flask containing 200ml of 10% NaOH solution, 4 Under the condition of NOH as the catalyst, add 180g 2,3-dimer...
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