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采用化学插层-超细研磨-酸侵渍活化-干燥-表面改性的方法有效地制备了活性纳米高岭土。结果表明:通过化学插层与超细研磨的复合方法可制备70%的颗粒小于100 nm的高岭土,其片厚为10～30 nm。与单纯采用机械研磨的方法相比,该复合方法可以降低超细研磨所需的能耗。经酸侵渍活化处理可增大活性纳米高岭土的比表面积,但未破坏高岭土特有的层状结构。在活性纳米高岭土表面包覆十六烷基三甲基溴化铵和含氢硅油,可使其具有良好的亲油疏水性能。另外,对比喷雾干燥方法,经共沸蒸馏干燥的活性纳米高岭土粉体具有更好的分散性,制得的活性纳米高岭土作为丁苯橡胶的补强填料可明显提高其拉伸强度和伸长率,并缩短硫化时间。
The active nano-kaolin was prepared effectively by chemical intercalation-ultrafine grinding-acid invasion activation-drying-surface modification. The results show that 70% of kaolin with particle size less than 100 nm can be prepared by chemical intercalation and ultrafine grinding with the thickness of 10-30 nm. Compared with the purely mechanical milling method, the composite method can reduce the energy consumption required for ultrafine grinding. Activated acid inactivation treatment can increase the specific surface area of active nanoclay, but does not destroy the unique layered structure of kaolin. The active nano-kaolin coated cetyl trimethyl ammonium bromide and hydrogen silicone oil, it can have good lipophilic and hydrophobic properties. In addition, compared with the spray drying method, the active nano-kaolin powder which is dried by the azeotropic distillation has better dispersibility, and the prepared active nano-kaolin can obviously improve the tensile strength and the elongation as a reinforcing filler of the styrene- And shorten the curing time.