Factors affecting the fading of plastic products
According to data and practice, there are many factors that affect the fading of plastic products. The fading of plastic colored products is related to the light resistance, itch resistance, heat resistance, acid and alkali resistance of pigments and dyes, and the characteristics of the resin used. When the color masterbatch is produced, it can be selected after comprehensive evaluation of the above-mentioned properties of the required pigments, dyes, surfactants, dispersants, carrier resins and room aging additives. The following are the conventional reasons for product discoloration and logistics Performance, for your reference.
1. Lightfastness
The light fastness of the colorant directly affects the fading of the product. For outdoor products exposed to strong light, the light fastness (light fastness) level requirement of the colorant used is an important indicator. The light fastness level is poor, and the product will quickly fade during use . So this is why, for example, anti-glare boards on highways, water horses, etc., after a few years of use, the color will become lighter after exposure to the sun, but generally when blow molding, a certain amount of anti-UV ingredients are added to ensure The longevity of product color retention time.
2. Heat resistance
The thermal stability of a pigment refers to the degree of thermal weight loss, discoloration, and fading of the pigment at the processing temperature. Inorganic pigments are composed of metal oxides and salts, with good thermal stability and high heat resistance. The pigments of a few compounds will undergo molecular structure changes and a small amount of fenfenphenolysis at a certain temperature. In fact, we need in the production process. If it is a plastic product that needs high temperature heating, we need to choose a more heat-resistant pigment to ensure color change and fading, and to ensure the overall appearance of the product.
3. Anti-itching
Some pigments undergo macromolecular degradation or other changes after oxidation and gradually fade. This process is high temperature oxidation during processing, and the second is when it encounters strong oxidants (such as chromate in chrome yellow). Oxidation. After mixing lake, azo pigment and chrome yellow, the red color will gradually fade.
4. Acid and alkali resistance
The fading of colored plastic products is related to the chemical resistance of the colorant (acid and alkali resistance, oxidation-reduction resistance). For example, molybdenum chrome red is resistant to dilute acid, but is sensitive to alkalis, and cadmium yellow is not acid resistant. These two pigments and phenolic resins have a strong reducing effect on certain colorants, which seriously affects the heat resistance and weather resistance of the colorants and causes fading. .
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