High-dispersity polishing solution for fine polishing of BAK-4 optical prism and preparation method of high-dispersity polishing solution

The invention discloses a high-dispersity polishing solution for BAK-4 optical prism fine polishing and a preparation method thereof.By strictly controlling the solid-to-liquid ratio, the reaction temperature and the reaction time of abrasive particles and branched polyethyleneimine, the branched polyethyleneimine is modified on the surfaces of the abrasive particles; and a small amount of polyacrylic acid-polyoxyethylene with a special molecular segment structure is introduced into the polishing solution, so that particle size distribution concentration of abrasive particles in the polishing solution and elimination of agglomerated large particles are realized, the surface of a polished part cannot be scratched, and the application prospect is good. 本发明公开了一种BAK-4光学棱镜精抛用高分散性抛光液及其制备方法，通过严格控制磨粒与支状聚乙烯亚胺固液比、反应温度和反应时间，将支状聚乙烯亚胺修饰在磨粒表面，并向抛光液中引入少量特殊分子段结构的聚丙烯酸-聚氧化乙烯，实现了抛光液中磨粒粒径分布集中和团聚大颗粒的消除，从而确保不会划伤抛光件表面，应用前景良好。