吸附在超细重质碳酸钙表面的分散剂定性研究

Study on Dispersant Absorbted on Ultra-fine Ground Calcium Carbonate Surface

采用扫描电子显微镜(SEM)、傅里叶变换红外光谱(FTIR)和核磁共振(NMR)方法,对吸附在超细重质碳酸钙表面的聚羧酸盐分散剂的存在进行表征。结果表明:由于有机分散剂在电子束的照射下容易产生损伤,造成像的反差及清晰度不高,因此在分散剂用量较少时,SEM不能表征有分散剂吸附在碳酸钙粒子表面;由于KBr压片制样对样品量要求很少,当分散剂用量较少时,FTIR也不能表征有分散剂吸附在碳酸钙粒子表面。用重水浸泡处含有分散剂的碳酸钙,对萃取液进行NMR分析,可以表征出有聚羧酸盐分散剂吸附在超细重质碳酸钙粒子表面。

Poly-carboxylic salt dispersant adsorbed on the ultra-fine ground calcium carbonate（GCC） surface was detected by SEM,FTIR and NMR. The results showed that when arnount of dispersant was used, SEM could not detect the dispersant adsorbed on the GCC surface because the organic dispersant was apt to damage under high power electron beam and caused the phase weak definition. F-TIR could not detect that dispersant adsorbed on the particle surface of GCC due to amount of dispersant in sample. Soaking GCC in D2O and analyzed abstracted liquid by NMR, poly-carboxylic salt dispersant could be detected that it was adsorbed on GCC surface.