超细h-BN粉在无水乙醇介质中复合分散工艺研究

发布时间：2018-01-22 03:52

本文关键词： 超细h-BN粉无水乙醇 pH-Zeta电位复合分散分散机理　出处：《硅酸盐通报》2017年04期 　论文类型：期刊论文

【摘要】：针对超细h-BN粉体易团聚、与有机基体界面相容性较差的缺点,研究了其在无水乙醇介质中的分散工艺。首先在测定其pH-Zeta电位的基础上,选取阴离子型(SA、OA、SDBS)、非离子型(PVP、KH570、司班85)和高分子型(PEG4000)分散剂进行超声分散研究。然后从以上几种分散剂中选取三种分散剂进行复合分散。实验发现:在最佳配比下,复合分散体系较单分散剂分散效果明显提升,PEG4000与SA的复合分散比最佳单分散剂的效果提升了18%;KH570与SA的复合分散体系比最佳单分散剂的效果提升了11%;推荐h-BN粉在无水乙醇中的分散工艺为:pH值为9时,在560 W的功率下用SA(4wt%)与PEG4000(1wt%)或者SA(1wt%)与KH570(4wt%)复合超声90 min。
[Abstract]:In order to solve the problem that ultrafine h-BN powders are easy to agglomerate and have poor compatibility with organic matrix, the dispersion process of ultrafine h-BN powders in anhydrous ethanol medium was studied. Firstly, the pH-Zeta potential was determined. The anion type SAA OA SDBSN, Nonionic type PVP KH 570 were selected. Then three dispersants were selected from the above dispersants for composite dispersion. Compared with monodispersant, the dispersion effect of the composite dispersion system increased by 18% compared with that of the best monodispersant of PEG4000 and SA. The effect of the composite dispersion system of KH570 and SA was improved by 11% than that of the best monodispersant. The dispersing process of h-BN powder in anhydrous ethanol was recommended as follows: the pH value of h-BN powder was 9:00. At a power of 560W, ultrasound was combined with SAH 4wt) and PEG40001wt) or SAH5704wt) for 90 mins.
【作者单位】：南京工业大学材料科学与工程学院;
【基金】：江苏高校优势学科建设工程项目(苏政办发2011-6)
【分类号】：TB383.3;TQ128
【正文快照】： 1引言六方氮化硼(h-BN)是类似于石墨的片层白色粉末,俗称“白石墨”[1]。由于其良好的导热性以及耐热性[2],广泛以填料形式应用于热界面材料[3]之中。由热界面材料的导热模型可知[4-5],在填充量较大的情况下,填料的粒径越小越容易形成导热通路,利于热的传递。然而填料的粒径越

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