Plastic coloring products will be faded by a variety of factors. The fading of plastic coloring products is related to pigments, dye light resistance, oxygen resistance, heat resistance, acid and alkali resistance, and the properties of the resin used.

The following is a detailed analysis of the fading factors of plastic coloring:

One, light resistance
The light resistance of the colorant directly affects the fading of the product, the outdoor product subject to strong light irradiation, the light resistance (light fastness) grade requirement of the coloring agent used is an important indicator, the light resistance grade is poor and the product will fade soon in use. Weathering products used in light-resistant grade should not be less than six, the best choice of seven, eight, indoor products optional four or five. The photographic properties of the carrier resin also have a great effect on the color change, and the molecular structure of the resin after UV irradiation is faded. The addition of a light stabilizer such as an ultraviolet absorber to the masterbatch improves the light resistance of the colorant and the colored plastic product.

Second, heat resistance

The thermal stability of the pigment refers to the degree of weight loss, discoloration and discoloration of the pigment at the processing temperature. The composition of inorganic pigments is metal oxide, salt, good thermal stability, high heat resistance. While the organic compounds of the pigment at a certain temperature will occur in the molecular structure of the changes and a small amount of decomposition. In particular, PP, PA, PET products, processing temperature above 280 ℃, in the choice of coloring agent on the one hand to pay attention to the heat resistance of pigments, on the one hand to consider the heat of the pigment time, usually require heat time 4-10rain The

Third, the antioxidant
Some organic pigments in the oxidation of macromolecules after the degradation or other changes and gradually fade, this process is the processing of high-temperature oxidation, and second, in the case of strong oxidants (such as chromium in the chromate) occurred in the oxidation. Lakes, azo pigments and chrome yellow mixed use, the red will gradually diminish.

Fourth, acid and alkali resistance
Coloring and coloring of the colorant (acid and alkali resistance, oxidation resistance). Such as molybdenum chromium red resistant acid, but sensitive to alkali, cadmium and yellow is not acid, these two pigments and phenolic resin on some colorants from the strong reduction effect, seriously affect the colorant heat resistance, weatherability and fade.

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