Injection molding method

The invention discloses an injection molding method which comprises the steps of compounding materials and putting the materials in an injection molding machine for injection molding, wherein during material compounding, a dispersing agent consisting of 5-10g Ircoplus 113 hyperdispersant and 2-8g color masterbatch dispersant is added to per kilogram of raw materials; then 2-2.2g toner and 100-200g expanded perlite are added to per kilogram of raw materials; and after the above materials are mixed for 10-20min and are uniform, the injection molding is carried out. Compared with the prior art, the original white oil is replaced by the Ircoplus 113 hyperdispersant and the color masterbatch dispersant, so that the raw materials, color masterbatch and a filling are dispersed more easily during mixing; the chemical stability of the dispersing agent is good, so that the oxidation resistance is good during the injection molding, a product can not produce black spots; due to the own characteristics of the dispersing a