In the process of coloring PVC plastic products, toner, color masterbatch and PVC paste will be used. How to choose these three plastic coloring materials?

No best answer

Toner coloring
The method of coloring plastic particles directly with toner (pigment or dye) and adding an appropriate amount of powdery additives, also known as dry coloring.
advantage:
1. Good dispersion;
2. Suitable for small batch plastic processing;
3. The cost is low, eliminating the need for manpower and material resources in the processing of color masterbatches and color pastes.
shortcoming:
1. Fly dust pollution, the 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 the molecules of the pigment powder are fully combined with the molecules of the carrier resin through heating, plasticizing, stirring, and shearing. Up, and then made into particles of similar size to the resin particles.
advantage:
1. Improved the environmental pollution caused by flying toner
2. It is easy to change the color during use, and it is not necessary to clean the hopper of the extruder.
3. Strong pertinence, simple color matching and easy quantification.
4. Compared with batch resin dry dyeing and granulation, the use of color masterbatch can reduce the resin performance aging caused by secondary processing of plastic products, which is conducive to the improvement of the service life of plastic products.
5. 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.
shortcoming:
1. Poor dispersibility. 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 plastic products. Therefore, the use of color masterbatch is due to its relative Capacitive and dispersive are limited.
4. The color paste is easy to control the amount of input in use, reduce the color difference, and improve the coloring power and color brightness
5. The environmental protection type meets the requirements of EU REACH and other regulations.
shortcoming:
1. At present, the biggest restriction on the development of color pastes is the production process of domestic color pastes. High-quality color pastes have higher requirements for process and raw material quality, and their cost will be higher than that of color masterbatches and toners.
2. The screw may slip when the added amount is large;
3. When stored for a long time, precipitation will occur, it is better to stir before use.