Macromolecular colorants are a new type of colored macromolecular polymers formed by introducing coloring groups into the main chain or side chain of macromolecules through certain chemical reactions. They have many advantages such as high safety and non-absorbability by the human body, and are a kind of environmentally friendly products that can save energy, reduce emissions and lower consumption.

Since its synthesis,polymer dyehave always been regarded as a type of functional colored macromolecular compound. They not only possess the light absorption properties of small molecule colorants, but also exhibit the stability of polymers.

This combination endows the macromolecular colorants with dual functions: namely, the large molecular size, high strength, easy film-forming property, solvent resistance, migration resistance, heat resistance, processability, as well as the strong absorption of light and the color diversity of the organic colorants.

In recent years, the research on macromolecular colorants has made rapid progress and has now become a new field in functional polymers andcolor chemistry. Macromolecular colorants not only possess the general functions of small molecule colorants, but also have many special advantages. For example, when the polymer framework is combined with traditional food pigments, and the molecular weight reaches above 3000, it will not be absorbed by the human digestive system. It will be excreted through the intestines and will not cause harm to the human body, making it safer.

1. Good resistance to migration. The large molecule colorants do not undergo molecular migration in the dyed substances, thus avoiding color mixing contamination.
2. Excellent heat resistance. The non-volatile and high melting point nature of the large molecule, combined with its low solubility at high temperatures, makes it have better heat resistance.
3. High safety. The large molecular chain size makes it unable to penetrate the skin and will not be absorbed by the human body, achieving the safety level for oral use.
4. Strong resistance to solvents. The large molecule colorants do not dissolve in most common solvents or have very low solubility, making them less prone to fading.
5. Good compatibility. The molecular framework used is the same as that of the dyed high molecular materials, significantly improving compatibility.
6. Green and environmentally friendly. The water-based high molecular materials are prepared based on water-based high molecular synthesis technology, truly achieving green and environmentally friendly properties.