FULLERENE-CONTAINING CARBON BLACK MANUFACTURE METHOD Russian patent published in 2005 - IPC

FIELD: carbon materials.

SUBSTANCE: reaction space is evacuated and filled with helium to pressure 0.1-0.4 atm, coaxial graphite electrodes are brought together to ignite electric arc between them, and graphite is evaporated at voltage 40-60 v and current intensity 250-400 A. Simultaneously, electrodes are continuously affected by video pulse packets characterized by duration 2·10^-4-2·10^-3 s, relative pulse duration in packet 10-100, and power 1-15 W. Resulting products are moved in helium flow and precipitated in carbon black collector in the form of fullerene-containing carbon black. To remove carbon black from inner surfaces of working chamber and carbon black collector, the surfaces are affected by alternate-polarity pulses with repetition frequency 50-500 Hz and power 1-10 W. To remove fragments of destroyed graphite rods and cathode deposit scoria from chamber space to bottom part of working chamber, pulse magnetic field with frequency 3-15 Hz and magnetic induction 0.05-0.1 Tl.

EFFECT: increased content of fullerenes in carbon black and reduced power consumption.

3 cl