Method for preparing oxidation-resistant flaky silver powder
A flake silver powder, anti-oxidation technology, used in metal processing equipment, transportation and packaging, etc., can solve the problems of easily oxidized silver polymer conductive paste, yellowing, etc., to improve anti-oxidation performance and eliminate surface additives. Influence and reduce the effect of process steps
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Embodiment 1
[0024] A preparation method of anti-oxidation flaky silver powder, specifically including several steps: chemical reduction, ball milling, wherein, the ball milling process includes step (1): ball milling into flakes; step (2): adding silver surface treatment passivation in the ball mill Agent, continue ball milling.
[0025] Chemical reduction: add 300L of pure water to the reaction vessel, and under stirring conditions, add 50kg of silver nitrate to make it completely dissolved; then dissolve 15kg of sodium hydroxide with 60L of pure water to prepare an aqueous solution of sodium hydroxide; Add sodium hydroxide aqueous solution dropwise in the solution, after the dropwise addition is completed; immediately add 15L formaldehyde solution dropwise for chemical reaction for 1 hour, and then wash the silver powder.
[0026] ball milling:
[0027] Step (1): Weigh 5 kg of the above silver powder, add 30 kg of zirconia with a diameter of Φ5 mm and put it into a ball mill jar, add 7...
Embodiment 2
[0030] A preparation method of anti-oxidation flaky silver powder, specifically including several steps: chemical reduction, ball milling, wherein, the ball milling process includes step (1): ball milling into flakes; step (2): adding silver surface treatment passivation in the ball mill Agent, continue ball milling.
[0031] Chemical reduction: add 200L of pure water to the reaction vessel, and add 40kg of silver nitrate under stirring conditions to dissolve it completely; make 120L of 25% ammonia solution and add it dropwise to the silver nitrate solution until the addition is completed Finally, the silver nitrate solution becomes a clear solution; then add 5L alkanolamine for chemical reaction for 1 hour, then wash the silver powder.
[0032] ball milling:
[0033] Step (1): Weigh 5kg of the above silver powder, add 40kg of zirconia with a diameter of Φ5mm into the ball milling tank, add 10L of absolute ethanol as the ball milling solvent, and add 50g of alkanolamine as an...
Embodiment 3
[0036] A preparation method of anti-oxidation flaky silver powder, specifically including several steps: chemical reduction, ball milling, wherein, the ball milling process includes step (1): ball milling into flakes; step (2): adding silver surface treatment passivation in the ball mill Agent, continue ball milling.
[0037] Reduction process: add 300L of pure water to the reaction vessel, and add 50kg of silver nitrate under the condition of stirring to make it completely dissolved; then dissolve 15kg of sodium hydroxide with 60L of pure water to prepare sodium hydroxide aqueous solution; add silver nitrate aqueous solution Add sodium hydroxide aqueous solution dropwise to the solution, and after the addition is completed; immediately add 30kg of ascorbic acid dropwise for chemical reaction for 1 hour, and then wash the silver powder.
[0038] ball milling:
[0039] Step (1): Take 5kg of the above-mentioned silver powder, add 50kg of zirconia with a diameter of Φ5mm and put...
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