Plastic Extruder Tips 5: Color Masterbatch Production Process

Color Masterbatch Production Process

Posted by Andy

The color masterbatch is an aggregate made of super constant pigment uniformly attached to the resin. Color masterBatch is a new type of polymer-colorant, also known as pigment preparation. It is made up of four basic elements: pigment or dye, carrier, dispersant, and additives. It is an aggregation of supernatural pigments or dyes attached to the resin and can be called pigment concentration, so its coloring force is higher than that of the pigment itself.

1.Pigment / Dye

Organic pigments: phthalocyanine red, phthalocyanine blue, phthalocyanine green, fast red, macromolecule red, macromolecule yellow, permanent solid yellow, permanent solid violet, azo red and so on.

Inorganic pigments: cadmium red, cadmium yellow, titanium dioxide, carbon black, iron oxide red, iron oxide yellow and so on.


PE,PP,ABS,PVC,PET,EVA etc. The special masterbatch generally chooses the same resin as the product resin as the carrier, the compatibility of the two is better, but at the same time also consider the carrier fluidity.


To promote the uniform dispersion of pigments and no longer agglomerate, the melting point of the dispersant should be lower than that of the resin, and it has good compatibility with the resin and has a good affinity with the pigment. The more commonly used dispersants are polyethylene low molecular waxes, stearates, etc.


Such as flame retardant, brightening, antibacterial, anti-static, anti-oxidation and other varieties, unless the customer requests, normally do not contain the above additives in the masterbatch.

In order to color the plastic evenly, the pigment particles must be sufficiently refined and evenly distributed into the plastic. The dispersion of the pigment not only affects the appearance of the colored product (spots, streaks, luster, color, and transparency), but also directly affects the quality of the colored product, such as strength, elongation, aging resistance, and resistivity.

  • The particle size of the pigment is more than 30 μm. The surface of the product will have spots and streaks.
  • 10-30 micron, matt surface
  • When the particle size is less than 5 microns, it can be used for general product use
  • Fiber (single wire diameter 20-30 microns) and ultra-thin film (less than 10 microns), pigment particle size should be less than 1 micron 

At present, a considerable number of masterbatch manufacturers at home and abroad use high-speed mixing and twin-screw extrusion technology. The process involves adding raw materials (including chromophoric resin, polyethylene wax, pigments, and additives) into the formulation and adding it to the high speed. Mixer, high-speed mixing of the material, through the high-speed operation and the role of the baffle to pre-crush the coarse particles of the pigment, and pre-wetting with the polyethylene wax with relatively low melting point, is wet at the same time Evenly adhere to the surface of the resin particles due to high temperature friction stir to produce plasticized surface;  Then the mixture is added to the same direction in parallel The twin-screw extruder is melt-plasticized, mixed, milled and other steps, and then extruded through a die to form a masterbatch product.

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