| 摘要 |
PURPOSE:To prevent agglomeration of zinc oxide particles in an insulating resin solution by pulverizing their compressed blocks obtained by compressing the zinc oxide powder with a pressure of 20-150kg/cm<2>, and burning the obtained particles of <=2.0mm diameter at a temperature of 200-600 deg.C. CONSTITUTION:The zinc oxide powder is compressed with a pressure of 20-150kg/cm<2>, pulverizing the compressed product to <=2.0mm particle diameter, and burning the obtained particles at a temperature of 200-600 deg.C to obtain the intended electrophotographic zinc powder. To compress the zinc oxide powder, an optional compressor, such as a hydraulic press used for molding mozaic tiles, can be used, and the compressed blocks may be pulverized by an optional method, and the intended particles can be obtained by passing the pulverized product through a sieving step. To burn the compressed blocks, a rotary kiln can be used, and particle density is, generally, 0.6-1.5g/cm<3>, and preferably, 0.7-1.2g/cm<3>. |
