碳酸钙晶须表面改性研究

采用不同改性剂对碳酸钙晶须表面进行改性研究，研究了改性剂种类、改性剂加入时间、改性剂用量等因素对碳酸钙晶须改性效果的影响。结果表明，采用单一改性剂时以硬脂酸钠的改性效果最佳；采用复合改性剂（硬脂酸钠和十二烷基硫酸钠）时，其改性效果优于采用单一改性剂硬脂酸钠；改性剂在碳化反应前加入效果较好；改性剂最佳用量为4%（质量分数）。最优改性产品的活化指数为98%，沉降体积为4.41 mL/g。对比碳酸钙晶须改性前后的红外光谱图，发现改性后出现了明显的亚甲基，说明改性剂已经牢固地键合在碳酸钙上。

Research on surface modification of calcium carbonate whiskers

Different modifiers are used to modify the surface of calcium carbonate whiskers.The influences of modifier′s types，modification time as well as modifier′s dosages are investigated.Results show that when use a single modifier，sodium stearate′s effect is the best；when use sodium stearate and lauryl sodium sulfate（SDS） as a compound modifier，it turns out a better consequence.The effect of modification is noteworthy when adding the modifier before carbonization；and the optimum content of modified agents is 4%（mass fraction）.The optimal activation index can achieve 98% and sedimentation volume is 4.41 mL/g.Compared the IR spectra of modified with unmodified calcium carbonate whiskers，there occurs a methene，which show that modifiers are strongly bonded on calcium carbonate.