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超细粉体湿法表面改性技术Wet surface modification technology of ultrafine powder

来源: 时间:2019-03-06 13:47:13 次数:

   对于湿法超细粉碎或其它湿法制粉工艺来说,超细粉体在干燥中会形成硬团聚体,因此,在湿法超细粉碎之后、干燥之前进行表面改性不仅可以防止超细粉体在干燥中形成难以解聚的硬团聚体,而且因湿式状态下颗粒易于分散使得表面改性剂分子与颗粒的接触机会较均匀等,表面改性效果较好。
   湿法表面改性的关键技术是表面改性剂的使用方法、配方和干燥工艺设备。原因是大多数有机表面改性剂不溶于水,不能直接添加;此外,干燥温度要控制适当,不能太高,以免表面改性剂分解。本技术的特点正是较好的解决了这两个问题:①根据浆液中使用的要求选择和配制表面改性剂;②采用干燥效率高、兼具干燥和解聚(软团聚)作用的多功能干燥机。

    

    For the wet ultrafine pulverization or other wet pulverization processes, the ultrafine powder will form hard agglomerates during drying. Therefore, surface modification after and before the wet ultrafine pulverization can not only prevent the formation of hard agglomerates which are difficult to depolymerize during drying, but also make the contact opportunity between the surface modifier molecules and particles due to the easy dispersion of particles in the wet state The surface modification effect is better.

    The key technology of wet surface modification is the use method, formula and drying equipment of surface modifier. The reason is that most of the organic surface modifiers are insoluble in water and can not be added directly; in addition, the drying temperature should be controlled appropriately and not too high to avoid the decomposition of the surface modifiers. The characteristics of this technology are to solve these two problems: ① select and prepare the surface modifier according to the requirements of the slurry; ② use the multi-functional dryer with high drying efficiency and both drying and depolymerization (soft agglomeration).

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