1. Ink method: As the name implies, it is a production method using ink color paste in the production of masterbatch, that is, a three-roll mill is used to coat a surface of a pigment with a low molecular protective layer. The ground fine color paste is then mixed with a carrier resin, then plasticized by a two-roll mill (also called a two-roll mill), and finally granulated by a single-screw or twin-screw extruder.
2. Flushing method: the pigment, water and dispersing agent are sanded to make the pigment particles less than 1 μm, and the pigment is transferred into the oil phase by a phase transfer method, and then dried to obtain a masterbatch. An organic solvent, as well as a corresponding solvent recovery unit, is required for phase inversion. The process is as follows:
Fine color slurry washing → evaporation concentrate drying → adding carrier → extrusion granulation
3. Pinching method: After blending the pigment and the oil carrier, the pigment is lyophilized to wash the pigment from the aqueous phase into the oil phase by kneading. At the same time, the surface of the pigment is coated by an oil carrier to stabilize the dispersion of the pigment and prevent the pigment from agglomerating.
4. Metal soap method: after the pigment is ground, the particle size reaches about 1μm, and the soap liquid is added at a certain temperature, so that the surface layer of each pigment particle is evenly wetted by the soap liquid to form a layer of saponification liquid, when the metal salt After the solution is added, it chemically reacts with the saponified layer on the surface of the pigment to form a protective layer of magnesium soap (magnesium stearate), so that the finely divided pigment particles do not cause flocculation, but protect a certain fineness. . The process is as follows:
Ingredients→stirring→coarse color slurry→three-roll grinding→fine color paste→two-roll plasticating→extruding granulation