Silver plated hollow glass micro bead and its surface silver plating process
A technology of hollow glass microspheres and processing technology, which is applied in the preparation of core-shell structure composite materials and electromagnetic shielding composite materials, and can solve problems such as cumbersome process steps
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Embodiment 1
[0018] Add 2 g of hollow glass microspheres to 250 mL of 2% NaOH solution, stir at 50° C. for 1 h, then filter and wash. Prepare 220mLAgNO in a container 3 (0.05mol / L) solution, slowly add ammonia water dropwise under stirring, until the formed precipitate just dissolves completely and becomes a transparent solution, add the previously treated hollow glass microspheres to the solution, stir for 1 hour, then heat to 50°C, Use an ultrasonic cleaner to disperse it, and after dispersing for 5 minutes, add a mixed solution of 55 mL of absolute ethanol and 1.25 mL of formaldehyde into the solution while stirring with a magnetic stirrer. After reacting for 20 minutes, the silver-plated hollow glass beads were filtered, washed, and dried in an oven at 80°C. The volume resistivity of the prepared silver-coated hollow glass microspheres was 4.193Ω·cm.
Embodiment 2
[0020] Add 2 g of hollow glass microspheres to 250 mL of 2% NaOH solution, stir at 50° C. for 1 h, then filter and wash. Prepare 220mLAgNO in a container 3 (0.05mol / L) solution, slowly add ammonia water dropwise under stirring, until the precipitate formed earlier just dissolves completely and becomes a transparent solution, add the previously treated hollow glass microspheres to the solution, stir for 30min, then heat to 70°C, Use an ultrasonic cleaner to disperse it, and after dispersing for 5 minutes, add a mixed solution of 55mL of absolute ethanol and 1.25mL of formaldehyde into the solution while stirring with a magnetic stirrer. After reacting for 20 minutes, the silver-plated hollow glass beads were filtered, washed, and dried naturally. The volume resistivity of the prepared silver-coated hollow glass microspheres was 4.820Ω·cm.
Embodiment 3
[0022] Add 2g hollow glass microspheres to 250mL mass fraction 5%Na 2 CO 3 solution, stirred at 70°C for 30 min, then filtered and washed. Prepare 220mLAgNO in a container 3 (0.05mol / L) solution, slowly add ammonia water dropwise under stirring, until the formed precipitate just dissolves completely and becomes a transparent solution, add the previously treated hollow glass microspheres into the solution, stir for 1 hour, then heat to 50°C, Use an ultrasonic cleaner to disperse it, and after dispersing for 5 minutes, add a mixed solution of 55mL of absolute ethanol and 1.25mL of formaldehyde into the solution while stirring with a magnetic stirrer. After reacting for 20 minutes, the silver-plated hollow glass beads were filtered, washed, and dried in an oven at 80°C. The volume resistivity of the prepared silver-coated hollow glass microspheres was 5.204Ω·cm.
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