化学学报 ›› 2002, Vol. 60 ›› Issue (7): 1156-1161. 上一篇    下一篇

研究论文

聚丙烯酸包覆超细碳酸钙的机理和表面性质研究

岳林海;谢伟宏;水淼;徐铸德   

  1. 浙江大学化学系,杭州(310027)
  • 发布日期:2002-07-15

Mechanism and Surface Characteristics of Polyacrylic Acid-Coated Ultra-fine CaCO_3

Yue Linhai;Xie Weihong;Shui Miao;Xu Zhude   

  1. Department of Chemistry, Zhejiang University,Huangzhou(310027)
  • Published:2002-07-15

以丙烯酸单体,低分子量、高分子量聚丙烯酸为表面处理剂对超细碳酸钙进行 表面处理 ,探讨了样品的包覆效率与处理剂的化学性质、处理的方法、条件及用量 的关系。样品溶解曲线的差异表明处理剂的分子结构及性质可能导致其在碳酸钙表 面的取向和排列方式的不同。这在XPS和IGC的分析中也得到了体现和佐证。从样品 溶解曲线,O/Ca和C~(290)/Ca摩尔比和估算得到的单分子层包覆量都较为一致,约 为0.6%左右。并初步解释了聚丙烯酸与碳酸钙表面相互作用的机理。

关键词: 碳酸钙, 聚丙烯酸, 表面处理, X射线衍射分析, 包复, 相互作用

The ultra-fine CaCO_3 coated with acrylic acid monomer and the polyacrylic aid with varied molecular weight was prepared. The influences of the chemical properties of the treating agent, the treatment method and conditions on the coating efficiency were investigated. The tropism and arrangement of the treating molecules on the surface greatly affected the dissolving curves observed, which was proved by IGC and XPS analysis. Maximum efficacy was expected at the monolayer coverage and it's coating amount was about 0.6 wt% according to the calculations based on the alignment mode which was in agreement with the results deduced from the molar ratio of O/Ca and C~(290)/Ca and inferred from the dissolving curves. The interaction mechanism between carboxyl group and calcite surface was also preliminary elucidated from the point of view of O/Ca and C~(290)/Ca molar ratio.

Key words: calcium carbonate, polyacrylic acid, surface treatment, XRD, CLADDING, INTERACTIONS

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