| 摘要 |
PURPOSE:In the production of graphite fluoride by reaction between carbon and fluorine, fine hollow particles of carbon are used as carbon source to produce (CF)n, (CC2F)n at a high reaction rate even under relatively mild conditions in high yield. CONSTITUTION:Fine hollow particles of carbon are prepared by spraying balls of phenolic resin into fine particles and foaming them with heat to effect simultaneous curing, or by suspending petroleum pitch in a low-boiling organic solvent or water, foaming by heating and carbonizing by calcination. The resultant carbon particles have on the average about 5-100 micron diameter, 0.05- 0.4g/cm<3> bulk density, about 0.5-50 micron wall thickness and about 100% carbon centent where the particle size, wall thickness, bulk density or the like can be freely controlled. However, the carbon particles of about 20-500 micron particle sizes are practically produced and it is enough to be used in following process. The time in reaction between such carbon particles and fluorine is shortened in the production of both (CF)n and (C2F)n remarkably. |
