重质碳酸钙粉体改性研究

Improvement of surface modification of ground calcium carbonate powder

采用硬脂酸、钛酸酯、十二烷基苯磺酸钠、磷酸酯及其不同配比对CaCO3进行表面改性处理。通过对改性效果分析,讨论各改性剂的改性特点及最佳配比,寻找碳酸钙的改性最佳工艺。对碳酸钙表面改性,按活性大小改性剂的排序为:硬脂酸>钛酸酯>磷酸酯>十二烷基苯磺酸钠,且复合改性剂比单一改性剂对碳酸钙表面改性效果明显。

Different modifiers such as stearic acid, titanate coupling agent, sodium dodecyl benzene sulfonate and phosphorate are applied to improve the surface activity of ground calcium carbonate powder. The surface modification effect by adding these modifiers is analyzed, the characteristics and the dosage of modifiers are discussed, the best parameters of these processes by adding different modifiers are obtained. The sequence of surface modification effect for ground calcium carbonate powder is： stearic acid 〉 titanate coupling agent 〉 phosphorate 〉 sodium dodecyl benzene sulfonate, and the surface modification effect upon ground calcium carbonate by composite modifiers are better than that of single modifier.