The dispersing agent MF was prepared by methylnaphthalene separated from C 10 heavy aromatic hydrocarbons, the byproduct of Tianjin Petrochemical Corporation, with sulfonation, polycondensation, neutralization and drying, and applied for dye. 以天津石化公司副产C10重芳烃(C10A)中提取的甲基萘为原料,经磺化、缩聚、中和、干燥,制得扩散剂MF,用作染料扩散剂。