Plastic colored products can be discolored by a variety of factors. The fading of plastic colored products is related to the light resistance of the pigment, the dye, the oxidation resistance, the heat resistance, the acid and alkali resistance, and the properties of the resin used.
According to the processing conditions and application requirements of plastic products, the above properties of the desired pigments, dyes, surfactants, dispersants, carrier resins and anti-aging additives should be comprehensively evaluated before the masterbatch is produced.
First, the lightfastness of the lightfast colorant directly affects the fading of the article. Outdoor products that are exposed to strong light will fade if the lightfastness level is insufficient, and the lightfastness (lightfastness) rating of the colorant used is an important indicator.
The light resistance grade is poor, and the product will fade quickly during use. The light resistance grade of outdoor products should be no less than six grades, preferably seven or eight grades, and four or five grades of indoor products. The light resistance of the carrier resin also has a great influence on the change of color, and the molecular structure of the ultraviolet-induced resin is changed to fade after irradiation. By adding a light stabilizer such as a UV absorber to the master batch, the light resistance of the colorant and the colored plastic article can be improved.