Will the total free metal impurities in colorants aggravate photo - aging?

    Some colorants contain heavy metal elements or impurities such as copper, manganese, and nickel, which have photoactivity and photosensitivity and will accelerate the photoaging rate of plastic materials. For example, phthalocyanine blue containing free copper and impurities will promote the photoaging of PP. Iron oxide red can reduce the effectiveness of light stabilizers in PP by more than 20%. For PE, the use of colorants such as titanium dioxide, ultramarine blue, chromium oxide green, cobalt green, and iron red will aggravate its photoaging. Therefore, when solving the problem of anti-aging, not only should we choose good anti-aging master batches, such as the anti-aging master batch of Hangzhou Jinwei Nano, but also pay attention to the selection of pigments.