Masterbatch manufacturers have to choose masterbatch pigments for a long time, which also includes many types, such as PVC masterbatch, PP masterbatch, etc. How to ensure the quality of the pigment used in masterbatch is actually a masterbatch One of the issues that grain manufacturers have always been concerned about.

The selection criteria of pigments for masterbatch should not only refer to related technical standards such as inks and coatings, but also consider the processability and application needs of the product, such as heat resistance, migration, weather resistance, and solubility. As well as the interaction with polymers or additives, such selected pigments are not only dazzling, but also non-fading and durable. The main properties and evaluation methods that the pigments for masterbatch should have are now.

1. Heat resistance

The heat resistance of plastic pigments refers to the degree of change in the color or performance of the pigment under processing and use temperatures. When considering the heat resistance of the pigment, the heating time should also be considered. When the plastic is processed, the processing method is different, and the heating time is different.

2. Coloring power

The tinting strength of a toner refers to the amount of pigment required for a certain color product, expressed as a percentage of the tinting strength of a standard sample. The coloring power of a pigment is not only related to its properties, but also related to the degree of pigment dispersion. The degree of dispersion mainly refers to the degree of fineness of the pigment. The greater the degree of dispersion, the stronger the coloring power, but there is a maximum value beyond which the coloring power decreases.

3. Light fastness and weather resistance

The color of certain pigments will change to varying degrees under the irradiation of light. Among them, most of the inorganic pigments have light resistance. After the organic pigments in plastic products are exposed to light, they will cause changes in the molecular structure of the pigments and other reasons, which affect saturation and even fade.

4. Migration resistance

The mobility of pigments refers to the long-term contact of colored plastic products with other solid, liquid, and gaseous substances or working in a specific environment, which may have chemical interactions with the above substances. The surface color migrates from the inside of the colorant, or migrates to adjacent plastic products or solvents.