双生磷酸酯钠盐对碳酸钙粉体的表面改性

摘要

The surface modification of calcium carbonate ultra - fine powders was studied by wet method with four kinds of sodium gemini phosphate self - synthesized and sodium stearate as modifing agent under the optimum conditions of the modifier molar concentration 1 mol/L, reaction temperature 30-35 °C , reaction time 6 h.the reaction pressure 0. 01 Mpa. The results showed that compared with unmodified ultra - fine powders, the viscosity of mix-ture of modified ultra - fine powders and liquid paraffin decreased, the water absorption and oil absorption on the surface of modified ultra - fine powders reduced. All these results showed the surface polarity of modified ultra - fine powders decreased, and the dispersibility of modified ultra - fine powders improved distinctly.%分别以自制的4种双生磷酸酯钠盐和硬脂酸钠为改性剂,在改性剂摩尔浓度为1 mol/L,反应温度为30～35℃,反应时间为6h,反应压力为0 01 MPa的优化条件下,采用湿法对碳酸钙表面进行改性.结果表明,与未改性碳酸钙相比,改性碳酸钙与液体石蜡混合体系黏度降低,表面吸水率和吸油量减小,分散性得到改善.