Preparation method for silver powder
A kind of silver powder, contact preparation technology
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[0039] The preparation method of the silver powder of the present invention is based on the mass of 100 parts of silver nitrate, and specifically may include the following steps:
[0040] a. Preparation of silver nitrate solution:
[0041] Silver nitrate 100
[0042] Deionized water 600-1000
[0043] Dispersant 1.0-10
[0044] Thickener 0.5-6
[0045] Mix and stir the above-mentioned substances according to their corresponding parts by weight until completely dissolved;
[0046] b. Preparation of reducing agent solution:
[0047] Deionized water 100-300
[0048] Dispersant 1.0-10
[0049] Thickener 0.5-6
[0050] Neutralizer 10-80
[0051] Strong reducing agent 0.1-5
[0052] Medium strong reducing agent or medium reducing agent 1-95
[0053] Weak reducing agent 5-200
[0054] Prepare the reducing agent solution according to the above substances and their corresponding parts by weight;
[0055] c. Preparation of silver powder:
[0056] Heat 1000 parts by mass of the silver nitrate solution prepared...
Example Embodiment
[0058] Example 1
[0059] a. Preparation of silver nitrate solution
[0060] Mix 60 g of silver nitrate, 1000 g of deionized water, 2.5 g of polyvinyl pyrrolidone, and 2 g of hydroxymethyl cellulose until completely dissolved.
[0061] b. Preparation of reducing agent solution
[0062] Mix 0.06 g of hydrazine hydrate (88%) solution, 200 g of deionized water, 13.5 g of ascorbic acid, 20 g of glucose, 0.5 g of polyvinylpyrrolidone, 2 g of hydroxymethyl cellulose, and 24 g of 25% concentrated ammonia water and mix and stir until completely dissolved.
[0063] c. Preparation of silver powder
[0064] Heat the silver nitrate solution prepared by a in a water bath to a constant temperature of 72°C, and stir at a speed of 500r / min, and then drop the reducing agent solution prepared by b into the silver nitrate solution at a speed of 5ml / min. After dripping, continue to stir for 5 minutes, take it out, let stand, cool, settle and age. Pour the supernatant liquid, wash the silver powder twice w...
Example Embodiment
[0066] Example 2
[0067] a. Preparation of silver nitrate solution
[0068] 60 g of silver nitrate, 1000 g of deionized water, 5 g of polyethylene glycol 400 (PEG), 3 g of sodium carboxymethyl starch, mix and stir until completely dissolved.
[0069] b. Preparation of reducing agent solution
[0070] Mix 0.06g of hydrazine hydrate (88%) solution, 200g of deionized water, 0.36g of formaldehyde (37%), 1.25g of polyethylene glycol 400 (PEG), 3g of sodium carboxymethyl starch, 20g of glucose, and ammonium bicarbonate ( AR) 26.7g, mixed and stirred until completely dissolved.
[0071] c. Preparation of silver powder
[0072] Heat the silver nitrate solution prepared in a in a water bath to a constant temperature of 70°C, and stir at a speed of 300r / min, and then drop the reducing agent solution prepared in b into the silver nitrate solution at a speed of 4ml / min. After dripping, continue to stir for 5 minutes, take it out, let stand, cool, settle and age. Pour the supernatant liquid, wash...
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