Coloring of inorganic pigments

It is generally ontitical coloring rather than surface coloring. Therefore, whether using toner, toner, or with the use of color master batches to make PVC coloring, the prerequisite is that the need to make in a molten state, so that inorganic pigments can be evenly distributed in the melt. However, under such processing conditions, inorganic pigment colorants themselves may change chemically or colorly.

If some azo pigments are less heat-resistant, they can be broken down into corresponding color phenols and color bases, causing the phase to change. Like some azo biphenyl yellow, biphenyl orange pigments, color is significantly reduced. Second, certain components of the colorant may contribute to the degradation of PVC resins, such as iron and zinc ions, which are catalysts for degradation reactions.

Therefore, the use of inorganic pigments iron oxide pigments or zinc oxide, zinc sulfide and Lide powder white pigments will reduce the degradation of the product, on the one hand, color fading, on the other hand to promote degradation. Such as group green (blue and purple) pigment sage poor acidity, so in the process of inorganic pigment coloring processing, will interact with the decomposition of hydrogen chloride and lose its due color and coloring power.