What Factors Are Involved In The Migration Of Organic Pigments In Plastic Coloring?

What are the factors related to pigment migration in plastics?


1. It is related to the solubility of the pigment in the plastic. The greater the solubility at the processing temperature, the higher the supersaturation once cooled, the faster the tendency and speed of recrystallization, and the more obvious the floating color.


2. Related to the pigment concentration, the greater the amount of pigment added to the plastic, the greater the tendency to float.


3. It is related to the molecular weight of the pigment. The larger the molecular weight, the more complex the spatial structure of the molecule, the slower the migration speed in the plastic, and the smaller the floating color.


4. It is also related to factors such as plastic coloring processing conditions and the use environment of plastic products. If the processing temperature of plastic is too high, the potential for color floatation is higher; the higher the use environment temperature of plastic products, the more powder The greater the tendency to bleed and bleeding.


5. It is related to the content of plasticizer in the plastic. The higher the content, the greater the migration tendency of the pigment.


6. The chemical structure of the pigment is similar to the chemical structure of the plasticizer, the greater the migration tendency of the pigment. Some insoluble monoazo red lineage organic pigments synthesized by phenols with lower molecular weight are not suitable for plastic coloring.