CARBON BLACK DISPERSION
OBJECT: Dispersion of food grade Carbon Black into water and propylene glycol. 25% carbon black and surfactant (Tween 80) into water. Final viscosity 10,000 cps pseudo plastic.
PROBLEM: Provide excellent dispersion “in minimum time”. Avoid agglomeration caused by powder floating on surface.
RESULTS: Mixer is started in down-mode in water. Surfactant, propylene glycol are added into vortex, then carbon black for prewetting and predispersion. Reverse mixer to up-mode for one hour to achieve final dispersion.
AB MIXER: C-3-2, 60″ immersion, 5-3/4″ rotor with 25 HP motor. Used in 500 gallon tank measuring 48″ diameter x 64″ high with dished bottom. Batch size 300 gallons.