Why Do Colored Plastic Products Fade?

In daily life, color plastic products everywhere, enrichouring our lives at the same time, plastic fading problem has become a problem. The fading of plastic coloring products is related to the heat resistance, light resistance(hou) of the colorant, acid and alkali resistance, and the properties of the resin used.Heat resistance Heat resistance means that there is no obvious change in color, colorand and performance at a certain processing temperature and within a certain period of time. Colorants are often subjected to heat in plastic molding, which often breaks down, leading to color changes. Generalin inorganic pigments have good heat resistance, but organic pigments and dyes of heat resistance vary, can maintain a stable organic pigment at high temperature, the most commonapplications are molybdenum, blue and acetaminophen, isomoquinone yellow and red. Therefore, it is particularly important to choose the right colorant by heat resistance index.
Light (waiting) light resistance is defined as the ability of colorants and polymer systems to maintain their color when exposed to sunlight. The main reason for the change between colorants and sunlight is the damage caused by UV and visible light in sunlight to coloring products. Weather resistance is defined as color changes in the temperature of the natural world and the wetting of rain and dew by the color of the color antnerizer and polymer system. The light resistance index is judged as 8 levels, 8 levels are the best, 1 is the worst. Weather resistance index is judged as 5 levels, 5 levels of the best, 1 level of the worst. The importance of light resistance varies according to its use and is sometimes extremely important, such as building panels, billboards and car taillights for outdoor use, where products are expected to remain stable under full daylight exposure for at least a decade.Acid-resistant alkaline Coloring plastic products are related to the chemical resistance (acid-resistant alkaline, redox-resistant) of colorants. Such as chromium red acid resistance, but sensitive to alkali, cadmium yellow acid resistance, these two pigments and phenolic resin for some colorants to play a strong reduction role, seriously affecting the heat resistance of colorants, weather resistance and fading. For the fading of plastic coloring products, the necessary colorant surfactant, dispersant, carrier resin and anti-aging additives should be used only after comprehensive evaluation according to the processing conditions and use requirements of plastic products.