The production process of color masterbatch is strictly regulated, and the wet process is generally adopted. The color masterbatch is made by water phase grinding, phase transformation, water washing, drying and granulation. Only in this way can the product quality be guaranteed.
In addition, when the pigment is grinded, a series of tests should be carried out, such as measuring the particle size of the sanded slurry, measuring the spread characteristics of the sanded slurry, measuring the solid content of the sanded slurry and measuring the particle size of the color paste.
There are four ways to produce masterbatch:
(1) Ink method: As the name implies, the production method of ink paste should be selected in the production of color masterbatch, that is, a low molecular protective layer should be coated on the surface of pigment through three-roll grinding. After grinding, the fine color paste is mixed with the medium resin, and then melted through a two-roller plastic mixer (also known as a two-roller open mixer), and granulation is carried out according to a single-screw or double-screw granulator.
The process is as follows:
Dressing, mixing, coarse color paste, three-roll grinding, fine color paste, two-roll plastic mixing, extrusion and granulation
(2) Rinsing method: the pigment, water and thickener shall be sanded to make the pigment particles less than 1 μ m. Through the phase transfer method, the pigment is transferred to the oil phase, and then the color master batch is prepared by drying. Organic solution and its corresponding solvent recovery equipment shall be used for phase inversion. The steps are as follows:
Fine color paste cleaning, evaporation, concentrate, dry, adding medium, extrusion and granulation
(3) Kneading method: after mixing the pigment and oily medium, the pigment can be washed from the water phase to the oil phase according to the characteristics of hydrophilic pigment. At the same time, the surface of the pigment is coated by oily media to make the pigment disperse smoothly and avoid the condensation of the pigment.
(4) Metal soap method: the particle size of pigment after grinding reaches 1 μ M, and add soap solution under certain conditions, so that the surface layer of each pigment particle is evenly wetted by the soap solution to produce a layer of saponification solution. When the metal salt solution is added, the chemical change with the saponification layer on the surface of the pigment will produce a protective layer of metal soap (magnesium stearate), which makes the ground pigment particles not cause flocculation, but maintain a certain particle size.
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