煤系煅烧高岭土表面改性研究

利用硅烷偶联剂对山西省小峪矿区煤系煅烧高岭土进行了表面改性实验．对改性后样品的活化指数和包覆率测定表明，偶联剂分子较好地包覆于颗粒表面，使其由亲水疏油变为亲油疏水．将改性后样品用于橡胶填料，能明显提高其机械物理性能．ＩＲ和ＭＡＳＮＭＲ分析表明，煅烧高岭土表面的Ａｌ－Ｏ键与偶联剂分子发生化学键合作用明显，而Ｓｉ－Ｏ键与偶联剂分子的化学键合作用则不明显．

Study on Surface Modification of Calcined Kaolin from Coal-Bearing Strata

The surface modification of calcined kaolin from coal bearing strata in Xiaoyu Coal Mine of Shanxi Province is studied. The calcined kaolin is modified by silane coupling agent under certain program. The results indicate that our modification process has greatly changed the surface feature of calcined kaolin from hydrophilic to oleophilic. The modified kaolin, when used as filler of rubber, is better in improving the mechanic property of rubber than that of the unmodified. In order to explore the modification mechanism, the modified samples are analyzed by IR and MAS NMR, and compared with the unmodified ones. The result shows that the chemical environment of Al O in the surface of calcined kaolinite is changed obviously, but that of Si O changed only a little. This result shows that the modification is mainly completed by linking Al on the surface of calcined kaolin with the silane coupling agent molecules, but no sufficient evidences can certify if Si O is also linked with the silane coupling agent molecules.