Masterbatch is one of the main uses of pigment, which contains many kinds, such as PVC masterbatch, PP masterbatch, etc., how to choose the pigment of masterbatch, in fact, it is also one of the problems that plastic factory has been concerned about.

The selection standards of pigments for masterbatch should not only refer to ink, coating and other relevant technical standards, but also consider the processability and application needs of products, heat resistance, migration, weather resistance, solubility and so on. As well as interacting with polymers or additives, this choice of pigments is not only brilliant, but also durable. The main properties and evaluation methods of pigments for masterbatch are introduced.

1, color strength

The tinting strength of pigment refers to the amount of pigment required for a certain color product, compared with the percentage of tinting force of standard sample. The tinting power of pigment is not only related to its properties, but also to the dispersion degree of pigment. The dispersion mainly refers to the pigment refinement, the better of the dispersion, the stronger of its coloring power, but there is a maximum value, Higher than this value the coloring strength decline.

2, heat resistance

The heat resistance of plastic pigments refers to the degree of change in color or properties of pigments at processing and application temperatures. When considering the heat resistance of pigments, we should also consider the heating time. Plastics are processed in products at the same time, different processing methods and different heating time.

3. migration resistance

The mobilitay of pigment is mean  plastic goods and other solid, liquid, gas and other state material contact or work below specific environment for a long time, likely produce chemical action. Surface color migrates from  the color material or into adjacent plastics or solvents.

4, light resistance and weather resistance

Some pigments vary in color under the light. Most of the inorganic pigments are light resistance, and the organic pigments in plastic products will cause changes in the molecular structure of pigments, which will affect the saturation and even fade.

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