工业化制备分散性良好的纳米银粉

Preparation of High Dispersed Nanometer Size Silver Powder

采用丙三醇作为还原剂，加入有机高分子分散剂0．5％～1．0％，在碱性环境介质下，将AgNO3还原制备纳米银粉。在银粉脱水干燥以前，对纳米银粉进行表面改性，通过油酸不饱和基、脂肪羧酸基团或多元醇羟基基团有机官能团取代颗粒表面的所有非架桥羟基及薄层水膜，可有效防止粉末在过滤、干燥过程中发生聚结。该种纳米银粉制备工艺简单、方便、批量大、团聚小、易分散，已在电子工业得到大量应用。

The nanometer silver powder is prepared from AgNO3 reduced by glycerine at basic environment with 0.5 % - 1% dispersant. Silver powder is treated by caprylic or oleic acid hydrophobic organic group in order to prevent agglomerating during drying. The nanosized silver powder has been widely used in electronic industry for their high dispersibility and compact crystal.