(中南大學 礦物工程系， 長沙 410083)
摘 要: 用沉降法研究了超微SiO2在水溶液中的分散行為，探討了超分散劑PSE與傳統(tǒng)分散劑的分散效果，并通過顆粒間相互作用能計算進一步研究了超分散劑PSE的作用機理。結果表明：A-B嵌段型超分散劑PSE的分散效果最好，且不受介質pH的影響，其分散穩(wěn)定作用的實質是增強了微粒間的靜電排斥作用和空間位阻排斥作用，并減弱了范德華吸引作用。
關鍵字: 超微SiO2； 超分散劑； 分散
（Department of Mineral Engineering，
Central South University，Changsha 410083, P.R.China）
Abstract:The dispersion behavior of ultrafine silica in aqueous system was investigated by the sedimentation test，and the effect of hyperdispersant PSE was studied comparing with traditional dispersants. Furthermore，the mechanism of PSE in the systems was revealed through calculating the interaction energies between particles. It is showed that the diblock hyperdispersant PSE is efficient and not affected by the pH of medium, and its main action is to increase the electrostatic force and the steric force and decrease the Van der Waals force due to adsorption dispersants.
Key words: ultrafine SiO2; hyperdispersant; dispersion
