A kind of preparation method of silver powder with low heat shrinkage
A shrinkage, silver powder technology, applied in metal processing equipment, transportation and packaging, etc., can solve problems such as the inability to use miniaturized high-reliability circuits, and achieve improved batch stability, intensified ion collision, and improved vibration. solid density and effect
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Embodiment 1
[0048] Step 1: Dissolve 40kg of high-purity silver nitrate crystals with 80L of deionized water in a temperature-controllable dissolving tank to prepare a 500g / L silver nitrate aqueous solution, and turn on the heating device to stabilize the temperature of the silver nitrate aqueous solution at 50°C; Dissolve 24kg of ascorbic acid crystals in 160L of deionized water in a temperature-controllable dissolving tank, adjust the pH value of the solution with sodium hydroxide, prepare a reducing agent solution with pH=3, and turn on the heating device to stabilize the temperature of the reducing agent solution at 50°C Add 440L deionized water in the reactor, turn on the stirring motor and set the rotating speed as 100r / min, open the heating device, make the temperature of the deionized water stable at 50°C, then add 1.25kg gum arabic in the reactor, after stirring The gum arabic was fully dissolved to make an aqueous dispersant solution; the speed of the silver nitrate aqueous soluti...
Embodiment 2
[0053] Step 1: Dissolve 25kg of high-purity silver nitrate crystals in 80L of deionized water in a temperature-controllable dissolving tank to prepare a 312.5g / L silver nitrate aqueous solution, and turn on the heating device to stabilize the temperature of the silver nitrate aqueous solution at 25°C; Dissolve 20kg of hydroquinone crystals with 160L of deionized water in a temperature-controllable dissolving tank to prepare a reducing agent solution with pH=6, and turn on the heating device to stabilize the temperature of the reducing agent solution at 25°C; Add 440L of deionized water, turn on the stirring motor and set the rotation speed to 300r / min, turn on the heating device to stabilize the temperature of the deionized water at 25°C, and then add 0.8kg of polyethylene glycol with a molecular weight of 1000 to the reaction kettle. The polyethylene glycol is fully dissolved to make a dispersant aqueous solution; the silver nitrate aqueous solution feeding peristaltic pump sp...
Embodiment 3
[0058] Step 1: Dissolve 30kg of high-purity silver nitrate crystals with 50L of deionized water in a temperature-controllable dissolving tank to prepare a 600g / L silver nitrate aqueous solution, and turn on the heating device to stabilize the temperature of the silver nitrate aqueous solution at 60°C; Dissolve 8kg of sodium hypophosphite crystals with 55L of deionized water in a temperature-controllable dissolving tank, adjust the pH value of the solution with sodium hydroxide, prepare a reducing agent solution with pH=8, and turn on the heating device to stabilize the temperature of the reducing agent solution At 60°C; add 580L of deionized water to the reactor, turn on the stirring motor and set the rotation speed to 150r / min, turn on the heating device to stabilize the temperature of the deionized water at 60°C, and then add 1.5kg of number-average molecular weight to the reactor The polyacrylic acid is 2000, under the action of stirring, the polyacrylic acid is fully dissol...
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