| 摘要 |
The preventive agent for color cement is prepared by the stages of heating 40-50 wt.% water at about 70 deg.C, pouring 3-5 wt.% casein and 0.5 wt.% liquid ammonia, mixing and cooling at room temp., adding 25-30 wt.% magneisum sulfate, 8-10 wt.% soda acetate and 5 wt.% potassium dichromate sequently, intensely stirring to make all solution foams, leaving for 2 hours and slowly stirring to mature the solution after the foams subside.
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