A kind of preparation method of spherical silver powder
A kind of spherical, silver powder technology, applied in metal processing equipment, transportation and packaging, etc., can solve the problems of difficult to adapt to the requirements of positive electrode fine grid screen printing, small specific surface area, reduce silver content and other problems, achieve cheap raw materials and waste liquid treatment. Simple, effective solution to dispersion problems
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Embodiment 1
[0031] 1. Dissolve 3.2g sericin protein powder in 5000mL deionized water, then add 500gL-ascorbic acid, after the dissolution is complete, use an acidic solution to control the pH value of the initial reducing agent solution between 1 and 2, and maintain the pH value of the reducing agent solution The temperature is 35±2℃;
[0032] 2. Dissolve 500g of silver nitrate in 2500mL of deionized water, and control the solution temperature to 35±2°C;
[0033] 3. Prepare an ammonia solution with a concentration of 1mol / L, and control the temperature of the solution at 35±2°C;
[0034] 4. Under strong stirring conditions, use a peristaltic pump to drop the silver nitrate solution (the dropping rate is controlled at 0.5L / min) into the reducing agent solution. After the silver nitrate solution is added dropwise for 5 minutes, add ammonia solution dropwise to adjust the mixing. The pH value of the reaction solution is around 3, and the temperature of the mixed reaction solution is kept at...
Embodiment 2
[0038] 1. Dissolve 3.2g sericin protein powder in 5000mL deionized water, then add 500gL-ascorbic acid, after the dissolution is complete, use an acidic solution to control the pH value of the initial reducing agent solution between 1 and 2, and maintain the pH value of the reducing agent solution The temperature is 35±2℃;
[0039] 2. Dissolve 500g of silver nitrate in 2500mL of deionized water, and control the solution temperature to 35±2°C;
[0040] 3. Prepare an ammonia solution with a concentration of 1mol / L, and control the temperature of the solution at 35±2°C;
[0041] Described steps 1, 2 and 3 are consistent with embodiment 1, and each reactant concentration is consistent;
[0042] 4. Under strong stirring conditions, use a peristaltic pump to drop the silver nitrate solution (the dropping rate is controlled at 0.5L / min) into the reducing agent solution. After the silver nitrate solution is added dropwise for 5 minutes, add ammonia solution dropwise to adjust the mix...
Embodiment 3
[0046] 1. Dissolve 3.2g sericin protein powder in 5000mL deionized water, then add 500gL-ascorbic acid, after the dissolution is complete, use an acidic solution to control the pH value of the initial reducing agent solution between 1 and 2, and maintain the pH value of the reducing agent solution The temperature is 35±2℃;
[0047] 2. Dissolve 500g of silver nitrate in 2500mL of deionized water, and control the solution temperature to 35±2°C;
[0048] 3. Prepare an ammonia solution with a concentration of 1mol / L, and control the temperature of the solution at 35±2°C;
[0049] Described steps 1, 2 and 3 are consistent with embodiment 1, and each reactant concentration is consistent;
[0050] 4. Under strong stirring conditions, use a peristaltic pump to drop the silver nitrate solution (the dropping rate is controlled at 0.5L / min) into the reducing agent solution. After the silver nitrate solution is added dropwise for 5 minutes, add ammonia solution dropwise to adjust the mix...
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