微波加热制备低水硼酸锌(ZB2335)的研究

The Synthesis of Zinc Borates(ZB2335) Powders by Microwave Heating

为了缩短普通工艺条件下制备硼酸锌的反应时间,本文引入了一种微波辐射加热的新方法.通过与电加热方法的比较实验表明,微波加热20分钟就可得粒度1-6μm分散性好单一相的2ZnO·3B2O3·3.5H2O(2335型)低水硼酸锌粉体,而在电加热和引入晶种条件下,反应8小时以上才得到低水硼酸锌.微波加热存在独特的非热效应,降低了反应的活化能,可极大地提高化学反应速度.采用XRD、SEM、TG-DTA对实验样品进行分析表征.

The synthesis of zinc borate was investigated in microwave heating in comparison with electrical heating. From some experiments, the well - dispersed particles (diameter of 1 - 6μm) of single phase of 2ZnO·3B2O3·3. 5H2O(Crystal phase 2335)was produced with microwave heating of 20 minutes. The zinc borate(ZB2335) can be obtained in conditions of electrical heating and crystal seeds in excess of 8 hours' reaction. Microwave heating has special non - heat effect so that it can lower activation energy of reaction, so chemical reaction can be accelerated greatly. The zinc borate samples were analyzed with XRD, SEM, TG - DTA.