Method for preparing nanosilver powder in batches
A technology of nano-silver powder and mass production, which is applied in the direction of nano-technology, can solve the problems of nano-silver agglomeration, agglomeration, and uneven particle size of nano-silver, and achieve the effect of increased surface area, uniform distribution of crystal seeds, and controllable quantity
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[0036] Example 1:
[0037] The preparation flow chart of nano silver powder is attached figure 1 :
[0038] (1) Weigh 150g of dimethylaminomethacrylamide / acrylic acid copolymer and dissolve it in 40L of dewatered water, then add 1020g of silver nitrate to dissolve, adjust pH=9 with 4% mass fraction of dilute ammonia water, and use a metering pump to add to the above solution Slowly add 8L dropwise to 5×10 -3 mol / L ascorbic acid aqueous solution, the dripping rate is 0.2mL / min; then, use a metering pump to quickly add 15L of 0.2mol / L ascorbic acid aqueous solution to the above solution, the dripping rate is 10mL / min, and continue to stir for 0.5h after dripping. Obtaining a nano silver mixed solution;
[0039] (2) Pass the nano-silver mixed solution obtained in step (1) through a membrane separation device (see attached figure 2 ) Perform membrane separation, the ultrafiltration membrane material is polyacrylonitrile, and the membrane pore size is 30nm. Pour the mixed solution into...
Example Embodiment
[0042] Example 2:
[0043] The preparation flow chart of nano silver powder is attached figure 1 :
[0044] (1) Weigh 150g of polyacrylic acid (PAA) and dissolve in 50L of deionized water, then add 340g of silver nitrate and stir to dissolve, use a micropipette to slowly inject 80mL into the above solution with a concentration of 8×10 -3 mol / L maltose aqueous solution, the dripping rate is 0.05mL / min; then, quickly inject 8.75L maltose aqueous solution with a concentration of 0.12mol / L with a micropipette, the dripping rate is 60mL / min, and continue to stir for 1h to obtain nano silver mixture;
[0045] (2) Pass the nano-silver mixed solution obtained in step (1) through a membrane separation device (see attached figure 2 ) Perform membrane separation, the ultrafiltration membrane material is polystyrene, and the membrane pore size is 50 nm. Pour the mixed solution into the material tank, then add deionized water, open the circulating pump and pipeline valve, the nano-silver mixed ...
Example Embodiment
[0048] Example 3:
[0049] The preparation flow chart of nano silver powder is attached figure 1 :
[0050] (1) Weigh 300g of polyvinyl alcohol and dissolve in 20L of deionized water, then add 340g of silver sulfate and stir to dissolve, use a metering pump to slowly drop 0.5L into the solution to a concentration of 1×10 -3 mol / L sodium hypophosphite aqueous solution, the dropping rate is 0.4mL / min; then, quickly drop 4.17L of 0.12mol / L sodium hypophosphite aqueous solution with a metering pump, the dropping rate is 20mL / min, and continue to stir for 1.5h , To obtain a nano-silver mixed solution;
[0051] (2) Pass the nano-silver mixed solution obtained in step (1) through a membrane separation device (see attached figure 2 ) To carry out membrane separation, the ultrafiltration membrane material is polyvinyl chloride, the pore size of the ultrafiltration membrane is 40nm; pour the mixture into the material tank, then add deionized water, turn on the circulation pump and pipeline va...
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