Four Factors Affecting The Fading Of Plastic Products
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.
Second, the thermal stability of the heat-resistant pigment refers to the degree of heat loss, discoloration, and fading of the pigment at the processing temperature. The inorganic pigment is composed of metal oxides and salts, has good thermal stability and high heat resistance. However, the pigment of an organic compound undergoes a change in molecular structure and a small amount of decomposition at a certain temperature.
Especially for PP, PA, PET products, the processing temperature is above 280 °C. On the one hand, when selecting the coloring agent, attention should be paid to the heat resistance of the pigment. On the one hand, the heat resistance time of the pigment should be considered, and the heat resistance time is usually required to be 4-10 m.
Third, the oxidation resistance of some organic pigments after the oxidation of macromolecules undergoes degradation or other changes and gradually fade, this process is the high temperature oxidation in processing, and the second is the strong oxidant (such as chromate in chrome yellow) Oxidation that occurs. When the lake, azo pigment and chrome yellow are mixed, the red color will gradually decrease.
Fourth, the fading of acid-resistant and alkali-colored plastic products is related to the chemical resistance (acid and alkali resistance, oxidation-reduction) of colorants. For example, molybdenum chrome red is resistant to dilute acid, but sensitive to alkali, and cadmium yellow is not resistant to acid. These two pigments and phenolic resin have strong reduction effect on certain colorants, which seriously affect the heat resistance, weather resistance and fading of the colorant.
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