论文部分内容阅读
鉴于水分散带来不可避免的严重二次团聚,本文拟通过实验寻求理想的有机分散介质.研究采用扫描电镜、粒度分析、流变和沉降等表征方法探讨了二甲亚砜、异丙醇和乙酸异戊酯3种分散介质对凹凸棒石黏土(以下简称凹土)解离效果的影响.实验发现:极性溶剂二甲亚砜对凹土具有接近于水的分散能力,但是在干燥过程中也存在类似的二次团聚;非极性溶剂乙酸异戊酯因对凹土缺乏溶剂化浸润能力而难以解离凹土;综合评判得出异丙醇是最佳分散介质.在对辊挤压预处理协同作用下,质量分数为7%的凹土浆料在异丙醇分散体系下以10 000r/min转速可较好实现凹土解离且干燥过程无明显二次团聚,所得纳米凹土在水及乙醇中都有非常良好的分散悬浮性能.
In view of the unavoidable serious secondary agglomeration caused by water dispersion, this paper intends to seek the ideal organic dispersion medium through experiments.METHODS: The effects of dimethylsulfoxide, isopropanol and acetic acid were investigated by scanning electron microscopy, particle size analysis, rheological and sedimentation methods, Isopentyl 3 disperse medium on the dissociation effect of attapulgite clay (hereinafter referred to as attapulgite clay) .It is found that the polar solvent dimethylsulfoxide has the ability to disperse the water close to water, but in the drying process There is also a similar secondary agglomeration; Isoamyl acetate, a nonpolar solvent, is difficult to dissociate due to the lack of solvating infiltration capacity of the soils; Isopropanol is the best dispersion medium through comprehensive evaluation. Under the pretreatment synergetic effect, the attapulgite slurry with the mass fraction of 7% can be well dissociated in the isopropanol dispersion system at a rotational speed of 10 000 r / min and without obvious secondary agglomeration in the drying process. The obtained nano-attapulgite In water and ethanol have very good dispersion suspension performance.