Preparation method of C.I. pigment yellow 13

The invention provides a preparation method of C.I. pigment yellow 13. The preparation method comprises the following steps: carrying out diazotization by the use of nitrosyl sulfuric acid, carrying out beating on 2,4-dimethyldiacetylaniline and carrying out high-pressure homogenization, cooling and dropwise adding an diazo liquid, and adjusting pH value with trisodium phosphate so as to finally prepare the C.I. pigment yellow 13. The product has advantages of uniform particle size, soft particle, high tinting strength, stable performance, good light resistance, good solvent resistance and good resistance transference in plastic. 本发明提供了一种C.I.颜料黄13的制备方法，该方法重氮采用亚硝酰硫酸进行重氮化，然后2，4-二甲基双乙酰苯胺经过打浆、高压均质，然后降温滴加重氮液，用磷酸三钠调整pH值。最终制备得到的C.I.颜料黄13粒径均匀、颗粒松软，具有着色力高，性能稳定，耐光、耐溶剂性好，在塑料中耐迁移性好。