Production process requirements and process flow o

2022-08-02
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The production process requirements and process flow of color masterbatch

the production process requirements of color masterbatch are very strict, and the wet process is generally adopted. The color masterbatch is made by water-phase grinding, phase transformation, water washing and drying. In the process of selection, the majority of users can select and granulate in combination with their own conditions. Only in this way can the quality of the product be guaranteed if the multiple grooves have equal spacing along the side wall of the disc. In addition, while grinding the pigment, a series of tests should be carried out, such as measuring the fineness of the sanding slurry, measuring the diffusion performance of the sanding slurry, measuring the solid content of the sanding slurry and measuring the fineness of the color slurry

there are four methods for the production process of Color Masterbatch:

(1) ink method: as the name suggests, it is the production method of using ink paste in the production of Color Masterbatch, that is, coating a layer of low molecular protective layer on the surface of the pigment through three roll grinding. The ground fine color paste is mixed with the carrier resin, then plasticized by a two roll plasticizer (also known as a two roll open mixer), and finally granulated by a single screw or twin-screw extruder

according to the process, the normal operation status of the experimental machine is as follows:

batching and stirring coarse color paste three roll grinding fine color paste two roll plastic refining and extrusion granulation

(2) washing method: the pigment, water and dispersant are sand ground to make the pigment particles less than 1 μ m. The pigment was transferred into oil phase by phase transfer method, and then dried to obtain color masterbatch. Organic solvents and corresponding solvent recovery devices are required for phase conversion. The flow chart is as follows:

fine color paste washing evaporation concentrate drying adding carrier extrusion granulation

(3) kneading method: after mixing the pigment with the oily carrier, the pigment is washed from the aqueous phase into the oil phase by kneading based on its lipophilic characteristics. At the same time, the surface of the pigment is coated by the oily carrier, so that the pigment can be dispersed and stabilized, and the pigment can not be condensed

(4) metal soap method: the particle size of pigment after grinding reaches 1 μ M, and add the soap solution at a certain temperature, so that the surface layer of each pigment particle is evenly wetted by the soap solution to form a layer of saponification solution. When the metal salt solution is added, it reacts with the saponification layer on the pigment surface to form a protective layer of metal soap (magnesium stearate), so that the ground pigment particles will not cause flocculation, but protect a certain fineness

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