The production process of masterbatch
The production process requirements of color masterbatch are very strict, and the wet process is generally used. The color masterbatch is made by water phase grinding, phase inversion, water washing, drying and granulation. Only in this way can the product quality be guaranteed.
The production process requirements of color masterbatch are very strict, and the wet process is generally used. The color masterbatch is made by water phase grinding, phase inversion, water washing, drying and granulation. Only in this way can the product quality be guaranteed.
In addition, while the pigment is being ground, a series of tests should be carried out, such as measuring the fineness of the sanding slurry, measuring the diffusivity of the sanding slurry, measuring the solid content of the sanding slurry, and measuring the fineness of the color paste.
There are four methods for the production process of masterbatch:
(1) Ink method: As the name implies, it is a production method of using ink paste in the production of color masterbatch, that is, through three-roll grinding, a low molecular protective layer is coated on the surface of the pigment. The ground fine paste is mixed with the carrier resin, then plasticized by a two-roll plasticizer (also called a two-roll open mill), and finally granulated by a single-screw or twin-screw extruder.
The process is as follows:
Batching and stirring Coarse color paste Three-roll grinding Fine color paste Two-roll plasticizing Extrusion granulation
(2) Rinse method: The pigment, water and dispersant are sanded to make the pigment particle smaller than 1 μm, and the pigment is transferred into the oil phase by the phase transfer method, and then dried to obtain the color masterbatch. An organic solvent and a corresponding solvent recovery device are required for phase inversion. Its process is as follows:
Rinse of fine color paste Evaporate concentrate drying Add carrier to extrude granulation
(3) Kneading method: After mixing the pigment and the oily carrier, using the lipophilic feature of the pigment, the pigment is washed from the water phase into the oil phase by kneading. At the same time, the surface of the pigment is covered by an oily 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 1 μm, and soap liquid is added at a certain temperature, so that the surface layer of each pigment particle is evenly wetted by the soap liquid, forming a layer of saponification liquid. After the salt solution is added, it chemically reacts with the saponified layer on the surface of the pigment to form a protective layer of metal soap (magnesium stearate), so that the finely ground pigment particles will not cause flocculation, and protect certain fine particles. Spend.
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