Sliver-plating electroplate liquid and preparation method thereof
An electroplating solution and silver-plating technology, which is applied in the field of silver-plating electroplating solution and its preparation, can solve problems such as unevenness, non-dense silver plating layer, and low hardness
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[0015] The invention provides a kind of preparation method of silver plating electroplating solution, and this preparation method comprises:
[0016] (1) Mix soluble silver salt, potassium borohydride, 3-nitrophthalic acid, succinimide, methanesulfonic acid and water to obtain a mixture M1;
[0017] (2) adding alkali to the mixture M1 to adjust the pH to 10-12 to obtain a mixture M2;
[0018] (3) heat-treating the mixed solution M2, auxiliary complexing agent, alanine and glycerol to prepare a mixture M3;
[0019] (4) post-processing the mixture M3 to obtain a silver-plating electroplating solution;
[0020] Wherein, the auxiliary complexing agent is selected from one or more of citric acid, thiourea compounds and dithioethylene glycol.
[0021] In the present invention, the specific type of thiourea compound can be selected in a wide range, and from the consideration of complexing ability, preferably, the thiourea compound is selected from dimethylthiourea, diphenylthiourea...
Embodiment 1
[0032] (1) Mix 1kg silver methanesulfonate, 80g potassium borohydride, 150g 3-nitrophthalic acid, 220g succinimide, 100g methanesulfonic acid and 2.8kg water to obtain mixture M1;
[0033] (2) adding sodium hydroxide to the mixture M1 to adjust the pH to 11 to obtain a mixture M2;
[0034] (3) 1 kg of mixed solution M2, 200 g of citric acid, 150 g of alanine and 40 g of glycerol were heat-treated at 70° C. for 25 min to prepare mixture M3;
[0035] (4) Concentrate the mixture M3 to a water content of 20% under 1 Pa to prepare the silver plating solution A1.
Embodiment 2
[0037] (1) 1 kg of silver phenol-3-sulfonate, 50 g of potassium borohydride, 120 g of 3-nitrophthalic acid, 200 g of succinimide, 80 g of methanesulfonic acid and 2.5 kg of water were mixed to obtain a mixture M1;
[0038] (2) adding potassium hydroxide to the mixture M1 to adjust the pH to 10 to obtain a mixture M2;
[0039] (3) 1 kg of mixed solution M2, 150 g of dimethylthiourea, 100 g of alanine and 20 g of glycerol were heat-treated at 50° C. for 30 min to prepare mixture M3;
[0040] (4) Concentrate the mixture M3 to a water content of 15% under 0.5 Pa to prepare the silver plating solution A2.
PUM

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