摘要：为了研究纳米氧化铝料浆的分散及流变行为,利用红外光谱学(FTIR)、流变测试、沉降实验、黏弹性测试等探讨纳米氧化铝预处理、聚乙烯亚胺(PEI)分散剂、抗坏血酸等对纳米氧化铝水基料浆的分散效率与沉降行为影响。结果表明:纳米氧化铝经水洗或酸洗预处理后,料浆的流变性得到明显改善;小分子量PEI(L-PEI)的分散效率优于分子量较大的PEI(H-PEI),L-PEI的最佳添加量质量分数为1%,H-PEI的最佳添加量质量分数为5%;添加质量分数为1%的L-PEI和0.2%的抗坏血酸,可使分散效率进一步提高,获得更低黏度的纳米氧化铝水基料浆;当纳米氧化铝料浆的体积分数为15%～20%时,可以获得分散稳定性较好的纳米氧化铝水基料浆。

关键词：纳米氧化铝；聚乙烯亚胺；分散剂；流动指数因子；流变性；分散机制

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 nanoalumina 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% ，nanoalumina suspension with good dispersion stability can be obtained． 

Keywords: nano-alumina; polyethyleneimine; dispersants; flow index factor; rheology; dispersion mechanism