煤系高岭土表面改性效果评价及机理研究

实验发现，活化指数法不能有效地反映煤系高岭土的表面改性效果。活化指数高的样品，在橡胶中并不具有好的补强效果。红外光谱（ＩＲ）和魔角旋转核磁共振（ＭＡＳＮＭＲ）研究证明，表面改性高岭土的补强效果取决于矿物颗粒表面化学键合与物理吸附的偶联剂分子的比例，化学键合的分子越多其补强效果越好。魔角旋转核磁共振（ＭＡＳ ＮＭＲ）研究表明，煤系高岭土表面的Ａｌ－Ｏ键是一个比较活跃的基团，易与偶联剂分子之间发生化学

EVALUATION AND MECHANISM FOR SURFACE MODIFICATION OF Kaolin FROM COAL MEASURES

Experiments showed that the activation index can't effectively reflect the surface mdification effect of Kaolin from coal-bearing strata. The samples which have high activation index don't always have good bolstering improvement when used in the rubber. It was proved by IR and MAS NMR that the bolstering improvement would be determined by the ratios of the moIecules wrapped around the mineral sudece in the form of chemical bonds to that wrapped in the form of physical adsorption when modified Kaolin was used in rubber. The more the chemical bonds were formed, the better the bolstering effect improved. MAS NMR study showed that the Al-O bonds on the Kaolin sudece are active groups that can react with coupling agents and form the new chemical bonds easily.