| 摘要 |
PURPOSE: A new crystalline, hydrated zinc borate having a relatively high dehydration temperature which makes it especially useful for use in polymers requiring processing at high temperatures is provided, and anhydrous form of the zinc borate is also provided. CONSTITUTION: In a process for preparing crystalline zinc borate having the formula 4ZnO·B2O3·H2O, the process comprises reacting zinc borate having the formula 2ZnO·3B2O3·3.5H2O in boiling water, wherein the process comprises heating an aqueous slurry containing less than 5 wt.% of 2ZnO·3B2O3·3.5H2O at a reflux temperature for a time that is sufficient to form crystalline zinc borate 4ZnO·B2O3·H2O, and wherein the process comprises reacting 2ZnO·3B2O3·3.5H2O with zinc oxide in boiling water.
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