There are four types of colorants for plastic profiles according to their physical forms: powder colorants-toner; solid colorants-masterbatch; paste colorants-color paste; liquid colorants-color oil; In the coloring of the plastics industry, toners and color masterbatches are relatively widely used. Let me talk about the advantages and disadvantages of the two colorants of masterbatch and toner?

Toner coloring: a method of directly using toner (pigment or dye) to add an appropriate amount of powdery additives to color plastic particles, also known as dry coloring.

The advantages of using toner to color plastic profiles: good dispersibility, suitable for small batch plastic processing, low cost, and saves the manpower and material resources in the process of processing color masterbatches and color pastes.

Disadvantages of toner coloring:

1. Fly dust pollution, pigments will fly during transportation, storage, weighing, and mixing, causing pollution and seriously affecting the working environment.

2. The hopper of the extruder is not easy to clean. The toner used for coloring is attached to the inner wall of the barrel (or even on the screw) under the action of a wetting agent such as white oil. When the material needs to be changed, cleaning the barrel becomes a problem for the on-site operators.

3. Blown film and spinning products are not practical. Toner is used for coloring. Because the pigment powder is evenly distributed in the resin to be colored, its dispersibility is better.

Masterbatch coloring: using a certain process and corresponding equipment, under the action of additives, the pigment (or dye) is mixed into the carrier, and through heating, plasticizing, stirring, and shearing, the molecules of the pigment powder are finally combined with the carrier resin. The molecules are fully combined and then made into particles of similar size to the resin particles.

​ The advantages of using color masterbatch for plastic profiles:

1. Improved the environmental pollution caused by flying toner, easy to change color during use, no need to clean the extruder hopper. Strong pertinence, simple color matching, and easy quantification.

2. Compared with the batch resin dry dyeing and granulating, the use of color masterbatch can reduce the resin performance aging caused by the secondary processing of the plastic product, which is beneficial to the improvement of the service life of the plastic product.

3. In the process of processing, the color masterbatch is fully mixed with the carrier resin under the action of additives. When in use, it is placed in the resin to be processed in a certain proportion, and the compatibility is obviously better than that of the toner coloring.

Disadvantages of color masterbatch:

1. The dispersibility is poor. Due to the small amount of addition, the processing time of plastic products is short. Due to the limitation of the extruder screw length-to-diameter ratio, the dispersion of the color masterbatch is often not as good as that of the toner.
2. The cost is high, one more manufacturing process, and the dyeing cost is higher than the toner coloring.

3. The performance requirements of the color masterbatch are relatively high. When the performance of the carrier in the color masterbatch is different from that of the resin to be colored, undispersed spots, color spots and patterns often appear on the surface of the plastic product. Therefore, the use of the color masterbatch is due to its relative Capacitive and dispersive are limited.

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