It has to be said that the relationship between pigment toner colorants and additives

1. Reaction between sulfur-containing pigments and additives in the relationship between pigment and toner colorants and additives Sulfur-containing pigments, such as cadmium yellow (solid solution of CdS and CdSe), are not suitable for PVC due to their poor acid resistance. Should not be used with lead containing additives.

2. Reaction of lead-containing compounds and sulfur-containing stabilizers in the relationship between pigment and toner colorants and auxiliary agents The lead components in chrome yellow pigments or molybdenum-chromium red react with antioxidants such as thiodistearate DSTDP.

3. Reaction between pigments and antioxidants For resins with antioxidants added, such as PP, in addition to the aforementioned "3.2", some pigments and antioxidants will also react, thus weakening the function of antioxidants, The thermo-oxidative stability of the resin is deteriorated. For example, phenolic antioxidants are easily absorbed or reacted with carbon black and lost; phenolic antioxidants and titanium ions in white or light-colored plastic products form phenolic aromatic complexes to cause yellowing of the products. Appropriate antioxidants or add auxiliary additives, such as antacid zinc salt (zinc stearate) or P2 type phosphite to prevent color change of white pigment (TiO2).

4. Reaction between pigments and light stabilizers Pigments and light stabilizers act. Except for the reaction between sulfur-containing pigments and nickel-containing light stabilizers, the effect of light stabilizers is generally reduced, especially hindered amine light stabilizers and light stabilizers. The effect of azo yellow and red pigments is more obvious, and its light stability decline effect is more obvious, and it is not as stable as uncolored. There is no definite explanation for this phenomenon.