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.
For the deficiency of submicron h-BN powder easy to reunite and poor interfacial compatibility with polymeric materials, the dispersion process of ultrafine h-BN powders in the anhydrous ethanol was studied.Firstly, the pH-Zeta potential of the h-BN ultrafine powders in anhydrous ethanol had been measured.Based on the results, the anionic dispersants (SA/OA/SDBS), nonionic dispersants (PVP/KH570/ Span85) and polymeric dispersant (PEG4000) were selected.The dispersion properties of different dispersing agents on the h-BN ultrafine powders were measured after being dispersed by ultrasound.According to the results of the last step, three kinds of dispersant had been chosen to form different composite dispersion systems and their dispersion properties had been tested.The results show that compound dispersion system has a better dispersive property compared with single dispersant, (PEG4000/SA) compound dispersant dispersive property increased by 18%;(KH570/SA) compound dispersant dispersive property increased by 11%.The best dispersion process of the h-BN ultrafine powders in anhydrous ethanol are: the quality fraction of SA(4wt%) and PEG4000 (1wt%) or SA(1wt%) and KH570(4wt%), at a pH of 9 and the ultrasonic (560 W) time for 90 min in anhydrous ethanol.
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