Preparation method of modified pigment yellow 12

The invention provides a preparation method of modified pigment yellow 12. In a preparation process of pigment yellow 12, silica gel (m-SiO2) and rosin are added; the surface dispersion surface of rosin, and the high adsorption performance and the granularity distribution uniform property of m-SiO2 are sufficiently utilized, so that prepared pigment grains can be firmly combined on the surface of m-SiO2 to form an organic-inorganic composite pigment; and the granularity distribution of obtained composite pigment grains is intensive, so that the performance of pigment yellow 12 is improved. The preparation method provided by the invention has the effects that modified pigment yellow 12 obtained by a modified preparation method is the organic-inorganic composite pigment, the grain diameter is small and the granularity distribution is intensive. Compared with a standard product, the chromatic light is strong, the coloring capability is improved by 5-10%, the transparency is improved by 10-15% and the heat resistance is improved by 5-10 DEG C.