| 摘要 |
An inexpensive insulating plate with excellent bonding strength, moldability, and heat insulation properties is provided to stably manufacture an ingot having less solidification flaws in a steel ingot, and a dry manufacturing method of the insulating plate is provided. A hot top insulating plate comprises, by weight percent, 5 to 15% of Cenosphere, 0.0005 to 0.003% of a silane coupling agent, 0.1 to 0.4% of a non-polar solvent, 1 to 4% of a binder, 1 to 4% of a hardener, 0.001 to 0.08% of a hardening promoter, and the balance of silica, wherein: the Cenosphere has a hollowness of at least 90%; the silane coupling agent is one selected from aminopropylmethyldimethoxysilane, aminopropyltriethoxysilane, and aminopropyltrimethoxysilane; the non-polar solvent is kerosene or heavy oil; the binder includes organic solvent-soluble resins obtained by performing addition and condensation reactions of phenols and aldehydes, and modified resins and mixtures thereof; the hardener is a polyisocyanate compound; and the hardening promoter is 4-phenyl propyl pyridine.
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