| 摘要 |
PURPOSE:To improve the heat resistance and corrosion resistance of a casting mold and to improve working environment by mixing sodium silicate with a standard liquid consisting of lignin sulfonate as a chief material to prepare a treating liquid for the mold surface and coating such treating liquid on the mold surface. CONSTITUTION:The standard liquid is prepd. by using the sodium silicate as the chief material and adding an alkaline soln. thereto and further, the sodium silicate is mixed at a prescribed ratio to this standard liquid to prepare the treating liquid for the mold surface. The treatment of the mold surface is executed by coating such treating liquid on the mold surface which is a surface to be poured with a molten metal and drying the coating. The treating liquid penetrates down to an adequate depth from the mold surface at this time and bonds among the particles of the molding sand to fix the surface layer part on drying, thereby forming the mold surface having high smoothness. The burn of the casting mold is thereby prevented and the casting surface is smoothed. The heat resistance and corrosion resistance of the casting mold are, therefore, improved and since no carbonaceous materials are used, the working environment is improved.
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