The production methods of injection masterbatch are:

(1) Ink method: As the name suggests, it is a production method for producing injection-molded master ink color paste, that is, three-roller grinding, covering the surface of the pigment with a low-molecular protective layer. After grinding, the fine color slurry is mixed with the carrier resin, and then plasticized by a two-roll smelter (also known as a two-roll opener), and finally pelletized by a single-screw or twin-screw extruder. The process is as follows: ingredient mixing coarse color paste, three-roll grinding fine color paste, two-roll forming extrusion granulation

(2) Washing method: sand the pigment, water and dispersant to make the pigment particles smaller than 1 meter, and use the phase transfer method to make the pigment enter the oil phase, and then dry to make the main batch. Cross-phase transfer requires organic solvents and corresponding solvent recovery devices.

(3) Kneading method: the pigment is mixed with the oil-based carrier. Because the pigment is relatively lipophilic, it is washed from the water phase into the oil phase by kneading the pigment. At the same time, the surface of the pigment is covered by the oil-based carrier to stabilize the pigment dispersion and prevent the pigment from coagulating.

(4) Metal soap method: After the pigment is ground, the particle size is about 1 meter, and soap is added at a certain temperature, so that the surface layer of each pigment particle is evenly wetted by the soap to form a layer of saponification. When the metal salt solution is added to the surface of the pigment The saponification layer produces a protective layer of metallic soap (magnesium stearic acid), so that the finely polished pigment particles will not cause flocculation, but protect a certain amount of fineness.