黏性体系中齿合型高剪切混合器解聚分散二氧化硅纳米颗粒性能研究  

Study on the performance of teethed high shear mixers for deagglomeration of silica nanoparticles in viscous system

作　　者：张自强 李哲 刘宝庆[1,2] ZHANG Ziqiang;LI Zhe;LIU Baoqing(Institute of Process Equipment,Zhejiang University,Hangzhou 310027,China;Institute of Wenzhou,Zhejiang University,Wenzhou 325006,China)

机构地区：[1]浙江大学化工机械研究所,浙江杭州310027 [2]浙江大学温州研究院,浙江温州325006

出　　处：《高校化学工程学报》2023年第3期367-375,共9页Journal of Chemical Engineering of Chinese Universities

基　　金：国家自然科学基金(21978255)。

摘　　要：为探究复杂体系中纳米颗粒解聚分散过程强化的新途径,在黏性体系中,研究了纳米颗粒解聚分散的机制以及可达到的最小尺寸,同时考察了转子转速、定转子结构与体系黏度等对齿合型高剪切混合器解聚分散性能的影响。结果表明,当能量输入由低到高时,解聚机制由断裂主导转变为由侵蚀主导,可达到的最小尺寸约为117nm,且不受转速等影响;提高转速可有效强化纳米颗粒解聚分散过程,显著提高细颗粒(dp<1μm)的生成体积和生成速率;在定子齿数为8~16、转子齿数为4~12、定转子齿角为0°~30°时,增大定子齿数或定子齿角对纳米颗粒解聚分散起强化作用,而增大转子齿数则表现为有限的强化作用,过大的转子齿角则不利于纳米颗粒的解聚分散;与清水体系相比,黏性体系能显著强化纳米颗粒的解聚分散,其强化作用随黏度的增大而增大。In order to strengthen the deagglomeration process of nanoparticles in complex systems,the deagglomeration mechanism and the smallest attainable nanoparticle size were experimentally studied in viscous system.The effects of rotor speed,stator and rotor structure and system viscosity on the deagglomeration performance of teethed high shear mixers were investigated.The results show that when the energy input increases,the deagglomeration mechanism changes from rupture to erosion.The smallest attainable size is about 117 nm and not affected by rotor speed.Increase of rotor speed can effectively intensify the deagglomeration of nanoparticles and significantly improve the generation volume and the generation rate of fine particles(dp<1μm).Under conditions of 8-16 teeth of stator,4-12 teeth of rotor and 0°-30°tooth angle of stator and rotor,increasing stator teeth number or stator teeth angle can intensify the deagglomeration of nanoparticles.However,increase of rotor teeth number shows limited intensification effect and large rotor teeth angles are not helpful to the deagglomeration of nanoparticles.Compared with water system,the viscous system can significantly enhance the deagglomeration of nanoparticles,and its intensifying effect increases with the increase of viscosity.

关 键 词：高剪切混合器 黏性体系 纳米颗粒 解聚分散 过程强化 

分 类 号：TQ465.92[化学工程—制药化工]