聚丙烯酸协同超声水热法制备超细凹凸棒土

Preparing Ultrafine Attapulgite by Ultrasonic Hydrothermal Method Cooperated with Poly(Acrylic Acid) Dispersant

报道了利用聚丙烯酸协同超声水热法制备超细凹凸棒土的一种非机械的超细研磨制备技术.在分散剂的协同作用下,超声水热法既能充分地超细粉碎凹凸棒土,又能保证粉碎后凹凸棒土晶体结构的完整性.通过正交实验获得了聚丙烯酸分散协同超声水热法制备凹凸棒土超细粉体的最优化工艺.处理后90%的凹凸棒土粒度d90=3.14μm,且容易重新分散在水中.X-射线衍射分析(XRD)表明聚丙烯酸不仅有助于超细分散凹凸棒土,还具有一定程度的纯化能力;扫描电镜分析(SEM)证明经该法处理的凹凸棒土晶体结构保存完整;由能谱分析(EDS)、热示-失重分析(DSC-TG)、傅立叶红外光谱(FT-IR)分析可知,聚丙烯酸对凹凸棒土颗粒的包覆是凹凸棒土超细分散及分散稳定的重要因素.

This article reports an efficient unmechanical comminution technology for smashing at tapulgite. Aiding with dispersant, ultrasonic hydrothermal method is able to realize ultrafine comminution without any damage of crystal structure in attapulgite treatment. The relational experiment was adopted to explore the optimal condition of ultrasonic hydrothermal method aided with poly（acrylic acid） dispersant for obtaining ultrafine attapulgite. The granularity d90 of treated attapulgite was below 3. 14 μm, which was easy dispersed in water over again. The results of X-ray diffraction（XRD） show that poly（acrylic acid） is very useful in uhrafine dispersing attapulgite with some rarefied ability. The results of scanning electron microscope （SEM） prove the attapulgite after treatment present ideal loose acerose crystal structure. Energy dispersive spectroscopy（EDS）, thermogravimetric analyzer and fouler transform-infrared spectrum indieate that the enwrapping function of poly（acrylie acid） to attapulgite is the key factor for ultrafine attapulgite forming and its dispersed stability.