Process for producing hollow carbon microspheres
Abstract
Abstract HOLLOW MICROSPHERES OF CARBON ARE OBTAINED BY HOMOGENEOUSLY MIXING A HARD, HIGHLY AROMATIC PITCH HAVING A SOFTENING POINT OF 60-350*C., A 0-25% NITROBENZENEINSOLUBLE MOIETY AND A H/C RATIO OF 0.2-1.0 WITH AN OR GANIC SOLVENT HAVING A LOW BOILING POINT AND BEING COMPATIBLE WITH THE PITCH, DISPERSING THE MIXTURE INTO WATER IN THE PRESENCE OF A PROTECTIVE COLLOID, ADJUSTING THE CONTENT OF THE SOLVENT IN THE RESULTING MICROSPHERES TO 0.210%, AND THEN FLASH-HEATING SAID MICROSPHERES TO 0.2THE SOLVENT THEREIN FUNCTIONS AS BLOWING AGENT TO FORM HOLLOW PITCH MICROSPHERES. SUBSEQUENTLY, THE HOLLOW MICROSPHERES OF PITCH ARE RENDERED INFUSIBLE BY HEATING THEM WITH AN OXIDIZING FLUID, GAS OR LIQUID, AND BAKED TO CARBONIZATION AT A TEMPERATURE OF 600-2000*C IN AN INERT ATMOSPHERE. THE RESULTING MICROSPHERES OF CARBON ARE EXCELLENTLY RESISTANT TO HEAT, CHEMICALS AND RADIOACTIVE RAYS AND ARE THUS SUITABLE AS HIGH-TEMPERATURE HEAT-INSULATORS, WARMINIG MATERIAL, STRUCTURAL MATERIAL FOR ATOMIC PILES, COMPOSITE MATERIALS WITH METALS, INORGANICS AND PLASTICS.
Inventors
- 👤 Y Amagi
- 👤 Z Shiiki
- 👤 Y Ohsumi
- 👤 K Noguchi
Bibliographic Details
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