| 摘要 |
PURPOSE:To obtain an impregnating material for parent materials such as graphite electrode, high-density carbon material, refractory, etc., by distilling away a crystalline oil component from a coaly heavy oil to give concentrated pitch having a small amount of quinoline-insoluble substance, blending the pitch with a specific noncrystalline aromatic oil component. CONSTITUTION:(A) Concentrated pitch having a small amount of quinoline-insoluble substance obtained by distilling away a crystalline oil component having <=500 deg.C boiling point from a coaly heavy oil such as coal tar, etc. is blended with (B) usually 5-40wt% noncrystalline aromatic oil component (preferable example, naphthalene oil freed from crystal, anthracene oil freed from crystal, creosote oil) having <=20 deg.C freezing point, >=200 deg.C boiling point, and H/C=0.7- 1.3, to give the desired impregnating agent. EFFECT:Having a large amount of fixed carbon, low softening point, improved flow properties and wetting properties, and good heat stability.
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