Preparation method of C.I. pigment yellow 180

The invention provides a preparation method of C.I. pigment yellow 180. The preparation method comprises the following steps: compounding three pigments in the synthetic process, carrying out diazotization by three-stage diazo, carrying out beating on 5-glycylacetylbenzimidazolone and carrying out high-pressure homogenization, and controlling pH value with trisodium phosphate so as to finally prepare the C.I. pigment yellow 180. The product has advantages of uniform particle size, soft particle, good light resistance and resistance transference, high tinting strength and excellent light resistance, heat resistance, solvent resistance, acid resistance and alkali resistance and processing application performance. 本发明提供了一种C.I.颜料黄180的制备方法，该方法采用三种颜料在合成过程中复配，重氮化采用三段重氮，5-氨基乙酰基乙酰苯并咪唑酮采用打浆及高压均质，采用磷酸三钠控制pH值的方法，最终制备得到的C.I.颜料黄180粒径均匀、颗粒松软，耐光、耐迁移好，具有较高的着色力及优异的耐晒性、耐热性、耐溶剂性、耐酸性和耐碱性以及加工应用性能。