LUO Guoqiang1,2，ZHANG Zhuang1，SUN Yi1，HU Jianian1，SHEN Qiang1
(1.State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology, Wuhan 430070,China;2.Chaozhou Branch of Chemistry and Chemical Engineering Guangdong Laboratory，Chaozhou 521011,China)
Abstract:In order to study the dispersion and rheological behavior of nanometer alumina slurry,infrared spectroscopy (FTIR),rheological tests,sedimentation experiments，and viscoelasticity tests were used to study the effects of pretreatment of nano-alumina powder,different polyethyleneimine (PEI) dispersants,and ascorbic acid on the rheological behavior of nano-alumina suspension.The results show that the rheology of the suspension is improved after the nano-alumina is pretreated.The dispersion efficiency of low molecular weight PEI (L-PEI) is better than PEI with higher molecular weight (H-PEI),the optimal mass fraction of L-PEI is 1%,and the optimal mass fraction of H-PEI is 5%.The addition of 1% L-PEI and 0.2% ascorbic acid can further improve the dispersion efficiency and obtain stable suspension with lower viscosity.When the volume fraction of nano-alumina suspension is from 15% to 20%,nano-alumina suspension with good dispersion stability can be obtained.
Keywords:nano-alumina；polyethyleneimine；dispersants；flow index factor；rheology；dispersion mechanism
中图分类号：TQ174 文献标志码：A
文章编号：1008-5548(2020)05-0041-07
DOI:10.13732/j.issn.1008-5548.2020.05.007
收稿日期： 2020-02-26，修回日期：2020-03-10，在线出版时间：2020-07-07 15:29。
基金项目：国家自然科学基金项目，编号：51932006;51521001；广东省重点领域研发计划项目，编号：2019B121204001。
第一作者简介：罗国强(1980—)，男，教授，研究方向为功能复合材料。E-mail：luogq@whut.edu.cn。
通信作者简介：孙一(1994—)，男，博士，讲师，研究方向为功能复合材料。E-mail：sunyiwhut@163.com。
